KR20090067075A - Display and lighting devices - Google Patents

Abstract

A display device and a lighting device for indicating an image in a pixel region of the front side of a display panel are provided to perform the biometric authentication of high precision and indicate an image in a pixel region of the front side of a display panel. A plurality of pixels is arranged on the surface of a pixel area in a display panel. An illumination unit(300) produces illuminance according to the normal direction to the display panel. The initial light generated from the light source is inserted in the side of a light guide plate(302). The initial light is guided to the radiation surface of the light guide plate. A plurality of photo sensor devices is arranged in the pixel region. The invisible light source produces the invisibility light as the initial light. An invisible light beam reflection unit(304) reflects the invisibility light from the rear side of the display panel in a direction which is parallel to the direction which squarely faces of the display panel.

Description

DISPLAY APPARATUS AND ILLUMINATION APPARATUS}

The present invention relates to a display device and a lighting device. In particular, the present invention has a display panel in which a plurality of pixels are arranged on a surface in a pixel region, and a plurality of photo sensor elements for receiving light directed from the front to the back are disposed in the pixel region, and a pixel on the front side of the display panel is provided. A display device for displaying an image in an area. In addition, the present invention relates to a lighting apparatus having an illumination unit for emitting illumination light along a normal direction perpendicular to the display panel.

Related Applications

The present invention claims the priority of Japanese Patent Application Nos. JP2007-327953 and JP2008-260906 filed to the Japan Patent Office on December 19, 2007 and October 7, 2008, the entire contents of which are referred to herein. It shall be used by.

A liquid crystal display device, that is, a display device such as an electroluminescence (EL) display device has advantages of thinness, light weight, and low power consumption. A more detailed description of such a display device is disclosed in Japanese Patent Application Laid-Open No. 2007-249241 and Japanese Patent Application Publication No. 2007-227117.

In such a display device, the liquid crystal display device has a liquid crystal panel in which a liquid crystal layer is sealed between a pair of substrates as a display panel. A liquid crystal panel is a transmissive panel, for example, and a liquid crystal panel modulates and transmits the illumination light which the illumination device provided in the back of a liquid crystal panel exited. A general example of a lighting device is a backlight. The display of the image by the modulated illumination light is displayed on the front of the liquid crystal panel.

This liquid crystal panel is, for example, an active matrix system and has a TFT array substrate in which a plurality of thin film transistors (TFTs) serving as pixel switching elements are formed. In the liquid crystal panel, an opposing substrate is disposed to face the TFT array substrate, and a liquid crystal layer is provided between the TFT array substrate and the opposing substrate. In an active matrix liquid crystal panel, a pixel switching element inputs a potential to a pixel electrode, thereby varying the voltage applied to the liquid crystal layer, controlling the transmittance of light passing through the pixel, and modulating the light.

In such a liquid crystal panel, in addition to the TFT which functions as a pixel switching element, the thing in which the photo sensor element which receives light and acquires light reception data is built in the pixel area is proposed.

For example, by using the built-in photo sensor element as an image sensor element, the function as a biometric authentication apparatus can be realized. Further details of the image sensor element and the biometric authentication device are disclosed in documents such as Japanese Patent No. 3742846.

In addition, the liquid crystal panel uses a built-in photo sensor element as a position sensor element, so that a function as a user interface can be realized. A more detailed description of the position sensor element and the user interface is disclosed in documents such as Japanese Patent Application Laid-Open No. 2007-128497. Therefore, the liquid crystal panel is called an integrated optical (I / O) touch panel.

In this type of liquid crystal panel, there is no need to separately install a resistive film type or an electrostatic capacitance type touch panel on the front surface of the liquid crystal panel. Therefore, the size and thickness of the device can be easily realized. In the case where a resistive touch panel or a capacitive touch panel is provided, the light transmitted through the pixel region may be reduced or the light may interfere with the touch panel. Therefore, the quality of the display image is deteriorated. It may become. However, by incorporating the photo sensor element into the liquid crystal panel as the position sensor element as described above, occurrence of this problem can be prevented.

In such a liquid crystal panel, for example, the photo sensor element receives visible light reflected by an object such as a finger in contact with the front surface of the liquid crystal panel. Thereafter, the position where the object is contacted is determined in accordance with the light reception data obtained by the photo sensor element, and the operation corresponding to the specified position is performed by the liquid crystal display device itself or another electronic device connected to the liquid crystal display device. do. In addition, biometric authentication may be performed on the object according to the light receiving data.

As described above, the light reception data obtained by the photo sensor element incorporated in the display panel may contain noise due to the influence of visible light included in external light. In addition, when black display is performed in the pixel region by the liquid crystal panel, it is difficult for the photo sensor element provided in the TFT array substrate to receive visible light emitted from the object to be detected. Therefore, it is sometimes difficult to accurately detect the position.

In order to solve such a problem, the technique which uses the lighting apparatus which has the invisible light source which emits invisible light other than visible light is proposed. Examples of invisible light include infrared light and the like. A more detailed description of this technique is disclosed in Japanese Patent Application Laid-open No. 2004-318819.

However, when a lot of noise is contained in the light reception data obtained by the photo sensor element, it may be difficult to obtain data of sufficient S / N ratio. Therefore, it may be difficult to perform the position detection and biometric authentication of a to-be-tested object with high precision.

In order to solve such a problem, the present invention provides a display device and an illumination device capable of improving the S / N ratio of an electrical signal representing light receiving data, and performing position detection and / or biometric authentication of an object with high precision. .

The display device of the present invention includes a display panel in which a plurality of pixels are arranged along a plane in a pixel area, and an illumination unit that emits illumination light along a normal direction perpendicular to the plane of the display panel. The illumination unit is disposed to face a light source for irradiating light and a surface of the display panel, and light emitted from the light source is incident from an incident surface, and light guides light incident from the incident surface. And a light guide plate on which the guided light is emitted as the illumination light from an emission surface. The display panel includes a plurality of photo sensor elements for receiving light directed from the front side to the back side of the display panel, wherein the plurality of photo sensor elements are arranged in the pixel area, and are configured to display an image on the front side. It is.

The light source includes an invisible light source that emits invisible light as light. The light guide plate includes an invisible light reflecting portion that reflects the invisible light emitted from the invisible light source from the rear surface of the display panel to the front. The invisible light reflecting portion is provided so as to correspond to an area where the plurality of photo sensor elements are formed by the pixel region, and the invisible light reflected by the invisible light reflecting portion is emitted from the emission surface as the illumination light. .

It is preferable that the invisible light source is comprised so that infrared light may be emitted as an invisible light ray.

Preferably, the apparatus includes a biometric authentication unit configured to authenticate a biological object positioned on the front side of the display panel. The photo sensor element generates the light receiving data by receiving the reflected light reflected from the front side of the display panel to the back side of the illumination light emitted from the illumination unit by the biological object. The biometric authentication unit authenticates the biometric object according to the light reception data.

Preferably, the photo sensor device generates light reception data by receiving the reflected light reflected by the illumination light by the blood of the living body.

Preferably, the display panel includes a first substrate positioned on the rear side, a second substrate facing each other at an interval from the first substrate, and positioned between the first substrate and the second substrate. It is located in the liquid crystal panel comprising a liquid crystal layer in which the liquid crystal molecules are aligned.

Preferably, the lighting unit is disposed on the back side of the display panel.

Preferably, the display panel is a transmissive liquid crystal panel. The illumination unit includes a visible light source that emits visible light, and the light guide plate is configured such that the visible light emitted from the visible light source is incident on the incident surface together with the invisible light emitted from the invisible light source, and the incident surface The visible light and the invisible light incident from the light are guided, and the guided visible light and the invisible light are emitted as the illumination light from the emission surface, and the image is displayed in the pixel area of the display panel which is the transmissive liquid crystal panel.

Preferably, the invisible light reflecting portion has an invisible light reflecting layer containing an invisible light reflecting pigment that reflects invisible light.

Preferably, in the region where the photo sensor element is formed by the pixel region, a plurality of the invisible light reflecting layers are formed, and the plurality of invisible light reflecting layers are arranged at intervals. .

Preferably, the invisible light reflecting portion has a diffraction grating portion for diffracting the invisible light rays and a reflecting portion for reflecting the invisible light diffracted by the diffraction grating portion.

Preferably, the invisible light reflecting portion is provided with a plurality of diffraction grating portions in a region where the photo sensor element is formed by the pixel region, and the plurality of diffraction grating portions are arranged at intervals.

Preferably, the lighting unit is disposed on the front side of the display panel.

Preferably, the invisible light reflecting portion includes a prism surface that reflects the invisible light emitted from the invisible light source from the back side to the front side of the display panel.

Preferably, the invisible light reflecting portion has an invisible light reflecting layer containing an invisible light reflecting pigment that reflects invisible light.

Preferably, in the region where the photo sensor element is formed by the pixel region, a plurality of the invisible light reflecting layers are formed, and the plurality of invisible light reflecting layers are arranged at intervals. have.

Preferably, the display panel is a reflective liquid crystal panel.

Preferably, the display panel is an EL panel.

In the illumination device of the present invention, a plurality of pixels are arranged along the surface in the pixel region, and a plurality of photo sensor elements for generating light reception data are received in the pixel region by receiving light from the front to the back. The front side has an illumination part which emits illumination light along the normal line direction perpendicular to the display panel which displays an image.

The illumination unit is disposed to face a light source for irradiating light and a surface of the display panel, wherein light emitted from the light source is incident from the incident surface, guides the light incident from the incident surface, and guides the light. The light includes a light guide plate emitted as the illumination light at the emission surface.

The light source includes an invisible light source that emits invisible light rays as the light. The light guide plate includes an invisible light reflecting portion that reflects the invisible light emitted from the invisible light source from the rear surface of the display panel to the front side. The invisible light reflecting portion is provided so as to correspond to an area where the plurality of photo sensor elements are formed by the pixel region, and the invisible light reflected by the invisible light reflecting portion is emitted from the emission surface as the illumination light.

In the present invention, in the light guide plate, the invisible light reflecting portion reflects the invisible light emitted from the invisible light source to the front from the back of the display panel. The invisible light reflecting portion is provided so as to correspond to an area where a plurality of photo sensor elements are formed by the pixel region, and the invisible light reflected by the invisible light reflecting portion is emitted from the emission surface as illumination light.

According to the present invention, it is possible to provide a display device and an illumination device which can improve the S / N ratio of an electrical signal representing light receiving data and can perform position detection and biometric authentication of a subject with high accuracy.

An example of embodiment which concerns on this invention is described.

<First Example>

(Configuration of Liquid Crystal Display)

1 is a cross-sectional view showing the configuration of a liquid crystal display device 100 according to a first embodiment of the present invention.

The liquid crystal display device 100 of this embodiment includes a liquid crystal panel 200, a backlight 300, and a data processing unit 400 as shown in the cross-sectional view of FIG. 1. Each is explained in turn.

The liquid crystal panel 200 is an active matrix system and, as shown in FIG. 1, includes a TFT array substrate 201, an opposing substrate 202, and a liquid crystal layer 203.

In the liquid crystal panel 200, the TFT array substrate 201 and the opposing substrate 202 are spaced apart from each other by a gap. The liquid crystal layer 203 is provided so as to be positioned between the TFT array substrate 201 and the opposing substrate 202.

The liquid crystal panel 200 is a transmissive panel. As shown in FIG. 1, the backlight 300 is disposed to be located on the side of the TFT array substrate 201. Illumination light emitted from the backlight 300 is irradiated to the liquid crystal panel 200 on the surface opposite to the surface of the TFT array substrate 201 facing the opposing substrate 202.

The liquid crystal panel 200 includes a pixel area PA for displaying an image. In this pixel area PA, a plurality of pixels not shown in the cross-sectional view of FIG. 1 is disposed. The illumination light R emitted by the backlight 300 provided on the rear side of the liquid crystal panel 200 is received from the rear surface through the first polarization board 206, and the illumination light R received from the rear surface is received in the pixel region ( Modulate at PA). In the TFT array substrate 201, a plurality of TFTs are formed as pixel switching elements not shown in the sectional view of FIG. 1, and the illumination light received from the back side is modulated by the TFT, which is a pixel switching element, being controlled to be switched on and off. do. The modulated illumination light R is emitted to the front side through the second polarizing plate 207, and an image is displayed in the pixel area PA. For example, a color image is displayed on the front side of the liquid crystal panel 200.

In addition, although the liquid crystal panel 200 of this embodiment is mentioned later in detail, the photo sensor element which is not shown in figure is formed in the sectional drawing of FIG. This photo sensor element is a target object when the object F of a user's finger, a touch pen, etc. contacts or approaches the front surface which becomes the opposite side to the back surface in which the backlight 300 was provided in the liquid crystal panel 200. The reflected light H reflected by (F) is received. For example, a photodiode is formed as a photo sensor element, and receives the reflected light H reflected by an object F such as a finger on the front side of the liquid crystal panel 200. That is, the reflected light H received from the opposing substrate 202 toward the TFT array substrate 201 is received. And the photo sensor element photoelectrically converts the reflected light H, and produces | generates the electrical signal which shows light reception data.

As shown in FIG. 1, the backlight 300 faces the rear surface of the liquid crystal panel 200 and emits illumination light R to the pixel area PA of the liquid crystal panel 200.

Specifically, the backlight 300 is disposed on the side of the TFT array substrate 201 in the counter substrate 202 constituting the liquid crystal panel 200 together with the TFT array substrate 201. Illumination light R is irradiated to the surface opposite to the surface which opposes the counter substrate 202 in the TFT array substrate 201. That is, the backlight 300 generates the illumination light R in a direction parallel to the direction from the TFT array substrate 201 to the counter substrate 202. More specifically, the backlight 300 generates the illumination light R in a normal direction z that is perpendicular to the plane of the liquid crystal panel 200.

As shown in FIG. 1, the data processing unit 400 includes a control unit 401 and a biometric authentication unit 402. The data processing unit 400 includes a computer, and is configured such that the computer operates as each unit in the liquid crystal display device 100 by a program.

The control unit 401 of the data processing unit 400 is configured to control the operations of the liquid crystal panel 200 and the backlight 300. More specifically, the controller 401 controls the operation of a plurality of pixel switching elements provided in the liquid crystal panel 200 by supplying a control signal to the liquid crystal panel 200. The pixel switching element itself is not shown in the cross sectional view of FIG. For example, the controller 401 controls the execution of an operation for sequentially driving the line connected to the pixel switching element. In addition, the control unit 401 controls the operation of the backlight 300 by supplying a control signal to the backlight 300, and generates the illumination light R from the backlight 300. In this way, the controller 401 can display an image in the pixel area PA of the liquid crystal panel 200 by controlling the operations of the liquid crystal panel 200 and the backlight 300.

In addition, the control unit 401 controls the operation of a plurality of photo sensor elements provided as position sensor elements in the liquid crystal panel 200 by supplying a control signal to the liquid crystal panel 200, and receives the received data from the photo sensor elements. Collect. The photo sensor element body is not shown in the cross-sectional view of FIG. 1. For example, the control unit 401 controls the execution of an operation for sequentially driving the line connected to the pixel switching element, and collects the light receiving data from the photo sensor element.

The biometric authentication unit 402 of the data processing unit 400 generates an image generated by an object F such as a finger of a human body in contact with or in proximity to the pixel area PA on the front side of the liquid crystal panel 200. The processing is performed, and biometric authentication is performed from the image processed image. In the present embodiment, the biometric authentication unit 402 performs biometric authentication according to the light-receiving data collected from the plurality of photo sensor elements provided in the liquid crystal panel 200. The photo sensor element is not shown in the cross-sectional view of FIG. 1. For example, after the photo sensor element receives the reflected light H reflected from the blood flowing through the vein in the finger, which is the object F, the received light data is generated, and then the generated light received data is used to obtain the vein of the finger. A pattern image is generated by image reconstruction processing. Thereafter, for each of the plurality of human fingers, biometric authentication is performed by extracting a pattern image corresponding to the generated pattern image from the plurality of pattern images previously stored in the memory. For example, biometric authentication is performed according to the characteristics of each pattern image, and data such as the name of a human body stored in association with the extracted pattern image is obtained.

(Overall Configuration of Liquid Crystal Panel)

Next, the whole structure of the liquid crystal panel 200 is demonstrated.

2 is a plan view showing the liquid crystal panel 200 used in the first embodiment of the present invention.

As shown in FIG. 2, the liquid crystal panel 200 has a pixel area PA and a peripheral area CA.

In the pixel area PA of the liquid crystal panel 200, as shown in FIG. 2, a plurality of pixels P are disposed along the plane. Specifically, the plurality of pixels P are arranged so as to be aligned in a matrix in each of the horizontal direction x and the vertical direction y, so that an image is displayed. Although details will be described later, the pixel P includes a pixel switching element not shown in FIG. 2. A plurality of photo sensor elements not shown in FIG. 2 is formed so as to correspond to each of the pixels P. As shown in FIG.

In the liquid crystal panel 200, the peripheral area CA is positioned to surround the periphery of the pixel area PA, as shown in FIG. 2. In the peripheral area CA, as shown in FIG. 2, the display vertical drive circuit 11, the display horizontal drive circuit 12, the sensor vertical drive circuit 13, and the sensor horizontal drive circuit 14 are formed. It is. For example, these circuits are comprised by the semiconductor element formed similarly to a pixel switching element and a photo sensor element.

The pixel switching element provided to correspond to the pixel P in the pixel area PA is driven by the display vertical drive circuit 11 and the display horizontal drive circuit 12 to execute image display. At the same time, the photo sensor element provided in the pixel area PA so as to correspond to the pixel P is driven by the sensor vertical drive circuit 13 and the sensor horizontal drive circuit 14 to collect light reception data. . As described above, neither the pixel switching element nor the photo sensor element is shown in FIG. 2.

Specifically, the display vertical drive circuit 11 extends in the vertical direction y as shown in FIG. 2. The display vertical drive circuit 11 is connected to the gate electrode of the pixel switching element formed so as to correspond to the plurality of pixels P in the vertical direction y. As described above, the pixel switching element is not shown in FIG. The display vertical drive circuit 11 sequentially supplies a scan signal to a plurality of pixel switching elements aligned in the vertical direction y in accordance with the supplied control signal. More specifically, a gate line is connected to each of the plurality of pixel switching elements formed corresponding to the plurality of pixels P aligned in the horizontal direction x, and the plurality of gate lines aligned in the vertical direction y. A plurality of pixels are formed to correspond to the pixels P. The display vertical drive circuit 11 sequentially supplies a scan signal to the plurality of gate lines. The gate line is not shown in the top view of FIG.

The display horizontal drive circuit 12 extends in the horizontal direction x as shown in FIG. 2. The display horizontal drive circuit 12 is connected to source electrodes of each pixel switching element formed to correspond to the plurality of pixels P in the horizontal direction x. As described above, the pixel switching element is not shown in the top view of FIG. The display horizontal drive circuit 12 sequentially supplies data signals to a plurality of pixel switching elements aligned in the vertical direction y in accordance with the supplied control signal. More specifically, a signal line is connected to each of the plurality of pixel switching elements formed corresponding to the plurality of pixels P aligned in the vertical direction y, and the plurality of pixels whose signal lines are aligned in the horizontal direction x. Plural numbers are formed so as to correspond to (P). The display horizontal drive circuit 12 supplies a video data signal to the plurality of signal lines in turn. The signal line is not shown in the top view of FIG.

The vertical drive circuit 13 for sensors extends in the vertical direction y, as shown in FIG. The sensor vertical drive circuit 13 is connected to each photo sensor element formed so as to correspond to the plurality of pixels P in the vertical direction y. As described above, the photo sensor element is not shown in the top view of FIG. 2. The vertical drive circuit 13 for a sensor selects the photo sensor element which reads light reception data from the some photo sensor element arrange | positioned in the vertical direction y according to the control signal supplied. A gate line is connected to each of the plurality of photo sensor elements formed corresponding to the plurality of pixels P aligned in the horizontal direction x, and the plurality of pixels P whose gate lines are aligned in the vertical direction y. A plurality is formed so as to correspond to. The vertical drive circuit 13 for a sensor supplies a scanning signal so that the plurality of gate lines may be selected in order. The gate line is not shown in the top view of FIG.

The horizontal drive circuit 14 for sensors extends in the horizontal direction x, as shown in FIG. The sensor horizontal drive circuit 14 is connected to each photo sensor element (not shown) formed so as to correspond to the plurality of pixels P in the horizontal direction x. The sensor horizontal drive circuit 14 sequentially reads light reception data from a plurality of photo sensor elements aligned in the vertical direction y in accordance with a control signal received from the control unit 401, and receives the light reception data into a biometric authentication unit ( 402). More specifically, the photo sensor element provided for each pixel P in the vertical direction y is connected to a signal reading line, and the plurality of pixels P whose signal reading lines are aligned in the horizontal direction x. A plurality is formed so as to correspond to). The sensor horizontal drive circuit 14 sequentially reads the light reception data from the photo sensor element through the plurality of signal readout lines and outputs the received data to the biometric authentication unit 402. Signal read lines are not shown in the top view of FIG.

(Configuration of Pixel Area in Liquid Crystal Panel)

3 is a cross-sectional view schematically illustrating a pixel P installed in a pixel area PA of the liquid crystal panel 200 used in the first embodiment of the present invention. 4 is a plan view schematically illustrating a pixel P provided in the pixel area PA of the liquid crystal panel 200 used in the first embodiment of the present invention. FIG. 3 is a part corresponding to the X1-X2 part shown by the dashed-dotted line of FIG.

As shown in FIG. 3, the liquid crystal panel 200 includes a TFT array substrate 201, an opposing substrate 202, and a liquid crystal layer 203.

In the liquid crystal panel 200, the TFT array substrate 201 and the counter substrate 202 are insulator substrates that transmit light, and are formed of, for example, glass. The TFT array substrate 201 and the counter substrate 202 are spaced apart from each other by a spacer (not shown), and are bonded to each other with a sealing material (not shown), so that the TFT array substrate 201 and the counter substrate 202 are separated from each other. The liquid crystal layer 203 is sealed in the gap. A liquid crystal alignment film (not shown) is formed on the surfaces of the TFT array substrate 201 and the counter substrate 202 facing each other, and the liquid crystal layer 203 is aligned by the liquid crystal alignment film. For example, the liquid crystal molecules of the liquid crystal layer 203 are vertically aligned.

As shown in FIGS. 3 and 4, the liquid crystal panel 200 includes a display area TA and a sensor area RA.

In the display area TA, as shown in FIG. 3, the color filter layer 21, the black matrix layer 21K, the counter electrode 23, the plurality of pixel switching elements 31, and the pixel electrode 62 are formed. It is. In the display area TA, the illumination light emitted from the backlight 300 is transmitted from the TFT array substrate 201 to the opposing substrate 202 and image display is performed.

The component of display area TA is demonstrated.

As shown in FIG. 3, the color filter layer 21 is formed on the surface of the side facing the TFT array substrate 201 by the opposing substrate 202. 3 and 4, the color filter layer 21 is composed of three primary colors of red, green, and blue as one set, and the red filter layer 21R, the green filter layer 21G, and the blue filter layer. (21B). The red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B are each rectangular in shape as shown in Fig. 4, and are formed to be aligned in the horizontal direction x. In addition, each of the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B is formed so as to be partitioned by the black matrix layer 21K. Each of the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B is configured such that illumination light emitted from the backlight 300 is colored and transmitted from the TFT array substrate 201 side to the counter substrate 202 side. It is. For example, the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B may be coated with a coating liquid containing a color pigment and a photoresist material corresponding to the color, such as a spin coating method. After forming a coating film by a coating method, it forms by pattern-processing the coating film by lithography technology. Here, polyimide resin is used as a photoresist material, for example.

As shown in FIG. 3, the black matrix layer 21K is formed on the surface of the side facing the TFT array substrate 201 by the opposing substrate 202. The black matrix layer 21K is formed so as to partition each of the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B constituting the color filter layer 21. For example, the black matrix layer 21K is formed using a black metal oxide film to shield light.

As shown in FIG. 3, the planarization film 22 is formed of an insulating material directly under the color filter layer 21 and the black matrix layer 21K so as to cover the color filter layer 21 and the black matrix layer 21K. . As described above, the specific surface of the opposing substrate 202 faces the TFT array substrate 201. The counter electrode 23 is a so-called transparent electrode, and is formed using, for example, ITO. The counter electrode 23 faces the plurality of pixel electrodes 62 and functions as a common electrode.

As shown in FIG. 3, the pixel switching element 31 is formed on the surface of the TFT array substrate 201 facing the opposing substrate 202. The red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B which constitute the color filter layer 21 of the pixel P are provided so as to correspond to each of them.

5 is an enlarged cross-sectional view of a cross section of the pixel switching element 31 used in the first embodiment of the present invention.

As shown in FIG. 5, the pixel switching element 31 includes a gate electrode 45, a gate insulating film 46g, and a semiconductor layer 48, and is formed as a bottom gate type TFT having a lightly doped drain (LDD) structure. It is.

Specifically, in the pixel switching element 31, the gate electrode 45 is formed using a metal material such as molybdenum, for example.

The gate insulating film 46g of the pixel switching element 31 is formed using an insulating material such as a silicon oxide film.

In addition, the semiconductor layer 48 of the pixel switching element 31 is formed with low temperature polysilicon, for example. In the semiconductor layer 48, as shown in FIG. 5, the channel region 48C is formed so as to correspond to the gate electrode 45, and a pair of source and drain regions on both sides of the channel region 48C. 48A and 48B are formed. In the pair of source and drain regions 48A and 48B, a pair of low concentration impurity regions 48AL and 48BL are formed so as to sandwich the channel region 48C. In addition, the pair of source and drain regions 48A and 48B have a pair of high concentration impurity regions 48AH and 48BH having higher impurity concentrations than the low concentration impurity regions 48AL and 48BL. It is formed to put in between.

In the pixel switching element 31, each of the source electrode 53 and the drain electrode 54 is formed using a conductive material such as aluminum.

As shown in FIG. 3, the planarization film 60 is formed in the pixel switching element 61 so as to cover the pixel switching element 31. As described above, the specific surface of the TFT array substrate 201 faces the opposing substrate 202. The pixel electrode 62 is provided on the planarization film 60. In the present embodiment, as shown in FIG. 3, a plurality of pixel electrodes 62 correspond to each of the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B constituting the color filter layer 21. Are formed at intervals, and are connected to the liquid crystal layer 203. The pixel electrode 62 is formed using, for example, ITO as a so-called transparent electrode, and is connected to the drain electrode 54 of the pixel switching element 31. The pixel electrode 62 applies a voltage to the liquid crystal layer 203 located between the counter electrodes 23 by a potential supplied from the pixel switching element 31 as a video signal.

On the other hand, in the sensor area RA, as shown in FIGS. 3 and 4, the light shielding portion 21S and the photo sensor element 32a are formed, and light incident from the front side of the liquid crystal panel 200 is detected. It is configured to.

As shown in FIG. 3, the light shielding portion 21S is formed on the surface of the side facing the TFT array substrate 201 by the counter substrate 202, and shields light. The light shielding portion 21S is provided similarly to the black matrix layer 21K. In the light shielding portion 21S, as shown in FIG. 3 and FIG. 4, the light receiving area SA is formed, and light is transmitted in the light receiving area SA. Similar to the display area TA, the planarization film 22 is formed on the opposing substrate 202 so as to cover the light shielding portion 21S, and the opposing electrode 23 is provided on the planarization film 22.

The photo sensor element 32a is formed in the surface of the side which opposes the opposing board | substrate 202 in the TFT array board | substrate 201 as shown in FIG. As shown in FIG. 3, the photo sensor element 32a is formed so as to correspond to the light receiving area SA, and the liquid crystal layer 203 transmits light directed from the side of the opposing substrate 202 to the TFT array substrate 201. Receive through The photo sensor element 32a receives the light incident from the light receiving area SA and performs photoelectric conversion to generate light receiving data, and the generated light receiving data is read. For example, in the photo sensor element 32a, as shown in FIG. 1, the illumination light R emitted by the backlight 300 is detected by the detector F from the front side of the liquid crystal panel 200 to the rear side. The light-receiving data is generated by receiving the reflected light H reflected by the light. In the present embodiment, the photo sensor element 32a generates light reception data by receiving the reflected light H on which the illumination light R is reflected by the blood of the object F as the biological object.

6 is an enlarged view of a cross section of the photo sensor element 32a used in the first embodiment of the present invention.

As shown in FIG. 6, the photo sensor element 32a has a PIN structure including a control electrode 43, an insulating film 46s, a semiconductor layer 47, an anode electrode 51, and a cathode electrode 52. Photodiode. The insulating film 46s is provided on the control electrode 43, the semiconductor layer 47 is provided to face the control electrode 43, and the insulating film 46s is disposed between the control electrode 43 and the insulating electrode 46s. It is.

Specifically, in the photo sensor element 32a, the control electrode 43 is formed using a metal material such as molybdenum, for example. The insulating film 46s is formed using an insulating material such as silicon oxide film such as polysilicon. In the semiconductor layer 47, an i-layer 47i of high resistance is interposed between the p-layer 47p and the n-layer 47n. The anode electrode 51 and the cathode electrode 52 are formed using a conductive material such as aluminum.

(Configuration of the backlight)

7 is a cross-sectional view schematically showing the backlight 300 used in the first embodiment of the present invention. 8 is a perspective view schematically showing a backlight 300 used in the first embodiment of the present invention.

As shown in FIG. 7, the backlight 300 includes a light source 301 and a light guide plate 302. The backlight 300 emits illumination light R to illuminate the entire surface of the pixel area PA of the liquid crystal panel 200.

As shown in FIG. 7, the light source 301 includes an irradiation surface ES for irradiating light, and the irradiation surface ES faces the incident surface IS on which the light is incident on the light guide plate 302. It is arranged. That is, the irradiation surface ES of the light source 301 is facing the incident surface IS provided in the side surface of the light guide plate 302. The irradiation surface ES generates light received by the incident surface IS for receiving the light generated by the light source 301. The light source 301 is configured so that a control signal is supplied from the control unit 401 and emits light according to the control signal.

In this embodiment, the light source 301 is provided with the visible light source 301a and the infrared light source 301b, as shown in FIG.

The visible light source 301a is, for example, a white LED and is configured to irradiate white visible light. As shown in FIG. 8, the visible light source 301a is arrange | positioned so that the irradiation surface ES may face the incidence surface IS of the light guide plate 302, and irradiates the incidence surface IS of the light guide plate 302. Visible light is irradiated from the surface ES. The plurality of visible light sources 301a are arranged so as to be aligned with the incident surface IS of the light guide plate 302.

The infrared light source 301b is, for example, an infrared LED and is configured to irradiate infrared light. As shown in FIG. 8, the infrared light source 301b is arrange | positioned so that the irradiation surface ES may face the entrance surface IS of the light guide plate 302, and irradiates the incident surface IS of the light guide plate 302. Infrared rays are irradiated from the surface ES. For example, infrared light whose center wavelength is 850 nm is irradiated. The visible light source 301a is one, for example, and is arrange | positioned so that it may be aligned with the visible light source 301a in the incident surface IS of the light guide plate 302 provided with the visible light source 301a. In this embodiment, as shown in FIG. 8, the infrared light source 301b is arrange | positioned so that it may become substantially center with respect to the incident surface IS of the light guide plate 302 in which the visible light source 301a was provided.

As shown in FIG. 7, the light guiding board 302 is formed so that the irradiation surface ES of the light source 301 may face the incident surface IS, and was irradiated from the irradiation surface ES. Light is incident. The light guide plate 302 guides light incident on the incident surface IS, and emits the guided light as illumination light R from the exit surface PS1 provided so as to be orthogonal to the incident surface IS. The light guide plate 302 is disposed to face the surface of the liquid crystal panel 200, and emits the illumination light R from the emission surface PS1 toward the rear surface of the liquid crystal panel 200. The light guide plate 302 is formed by injection molding using a transparent material having high light transmittance, such as an acrylic resin, for example.

More specifically, in this embodiment, in the light guide plate 302, both the visible light emitted from the visible light source 301a and the infrared light emitted from the infrared light source 301b are incident on the incident surface IS, and the incident light is incident on the light guide plate 302. The visible light and the infrared light incident from the surface IS are guided. Then, the guided visible light and infrared light are emitted as the illumination light R from the emission surface PS1. As described above, an image is displayed in the pixel area PA of the transmissive liquid crystal panel 200 by the emission of visible light.

As shown in FIG. 7, the light guide plate 302 is provided with an optical film 303, a reflective film 304, and an infrared reflecting layer 305.

As shown in FIG. 7, the optical film 303 is provided to face the exit surface PS1 in the light guide plate 302. The optical film 303 is configured to receive illumination light R emitted from the emission surface PS1 of the light guide plate 302 and modulate its optical characteristics.

In the present embodiment, the optical film 303 includes a diffusion sheet 303a and a prism sheet 303b. In the light guide plate 302, the diffusion sheet 303a is provided on the emission surface PS1, and the prism sheet 303b is provided on the diffusion sheet 303a. In the light guide plate 302, the diffusion sheet 303a diffuses the light emitted from the exit surface PS1 of the light guide plate 302, and the prism sheet 303b emits the diffused light to the exit surface of the light guide plate 302. The light is focused in the normal line direction z perpendicular to the PS1. By doing in this way, the optical film 303 radiates the light radiate | emitted from the light guide plate 302 to the back surface of the liquid crystal panel 200 as illumination light R of planar light.

As shown in FIG. 7, the reflective film 304 is provided so as to face the surface located on the side opposite to the exit surface PS1 in the light guide plate 302. The reflective film 304 receives light emitted from the surface PS2 located on the opposite side to the emission surface PS1 in the light guide plate 302, and reflects the light toward the exit surface PS1 side of the light guide plate 302. .

As shown in FIG. 7, the infrared reflecting layer 305 is formed on the surface PS2 on the light guide plate 302 opposite to the emission surface PS1 and is included in the light source 301 ( It is comprised so that only the infrared rays radiate | emitted from 301b) may be reflected.

The infrared reflecting layer 305 reflects only the infrared ray in the direction parallel to the direction from the back side to the front side of the liquid crystal panel 200. The infrared reflecting layer 305 is provided so as to correspond to the region where the plurality of photo sensor elements 32a are formed by the pixel region PA, and the infrared light reflected by the infrared reflecting layer 305 is used as the illumination light R. FIG. It exits from the exit surface PS1.

As shown in Fig. 8, a plurality of infrared reflecting layers 305 are formed, and the plurality of infrared reflecting layers 305 are provided in a dot pattern at intervals in the plane direction. More specifically, the infrared reflecting layer 305 is circular, as shown in FIG. 8, and is arranged in a matrix in the x and y directions. The infrared reflecting layer 305 is provided at the center portion of the surface PS2 of the light guide plate 302.

In the present embodiment, the infrared reflecting layer 305 is formed to include an infrared reflecting pigment that reflects infrared light. For example, by using a printing liquid containing an infrared reflecting pigment and a binder resin, the light guide plate 302 performs a printing process on a surface located on the side opposite to the exit surface PS1. This infrared reflecting layer 305 is provided.

For example, as an infrared reflecting pigment used for the infrared reflecting layer 305, brand name AB820 Black (Kawamura Chemical Corporation) is preferable.

FIG. 9 is a diagram showing the spectral reflection factor of the infrared reflecting pigment contained in the infrared reflecting layer 305 used in the first embodiment of the present invention. In FIG. 9, the horizontal axis represents the wavelength (nm) of incident light, and the vertical axis represents the reflectance (%) at which the light is reflected. One of the curves shows the relationship between the spectral reflectance of a typical carbon black (CB) functioning as an infrared reflecting pigment and the wavelength of light, and the other curve shows the spectral reflectance and wavelength of light of AB820 Black made by Kawamura Chemical Corporation serving as an infrared reflecting pigment. Indicates a relationship between Fig. 9 shows the results of a search for “infrared reflecting pigment” (Kawamura Chemical), December 18, 2007 or the website address http://www.sanyo-trading.co.jp/kagaku/pdf/4.pdf. Quotes are taken from online information indicating the search results.

As shown in Fig. 9, the AB820 Black made by Kawamura Chemical Corporation, which is used as an infrared reflecting pigment, has a reflectance of 50% with respect to infrared light having a wavelength of 850 nm, for example. In contrast, AB820 Black has a reflectance of 5% or less with respect to light having a wavelength corresponding to visible light. Therefore, the AB820 Black can reflect infrared light better at higher spectral reflectance than the specular reflectance to which visible light is reflected.

Moreover, as binder resin used for the infrared reflecting layer 305, it is preferable to use resin which transmits light, such as an acrylic resin. For example, acrylic resin MG10 made by Sumitomo Chemical Corporation can be used as the binder resin used for providing the infrared reflecting layer 305. And the mixed liquid which mixed the infrared reflecting pigment with the binder resin is printed, and the infrared reflecting layer 305 is formed. Specifically, after adjusting the ink liquid so that the pigment mixing concentration is contained in the range of 0.01 to 5% by weight relative to the binder resin, the ink liquid is printed on the light guide plate by dot printing. For example, the size of a dot may be a value in the range of 10 µm ² to 500 µm ² . In addition, the density of the dots is designed so that the uniformity and intensity of infrared planar light sources on the upper surface of the backlight are optimized. The design of such dot density is performed by optical simulation.

The thickness of the infrared reflecting layer 305 is preferably 0.8 µm or more.

It is preferable to provide a plurality of visible light reflecting layers that selectively reflect only visible light in the form of dots, similarly to the infrared reflecting layer 305.

(action)

Hereinafter, in the liquid crystal display device 100, when a finger of the human body as the object F is in contact with or moved to the pixel area PA of the liquid crystal panel 200, according to the light reception data obtained from the object F The operation at the time of biometric authentication will be described.

FIG. 10 shows a user's finger as the sensing object F in the pixel area PA of the liquid crystal panel 200 while the biometric authentication process is performed by the liquid crystal display device 100 according to the first embodiment of the present invention. It is sectional drawing which showed typically the form according to the light reception data obtained from the to-be-detected object F when it contacts or moves. In FIG. 10, only the elements related to the biometric authentication process are shown, and other parts are omitted.

When the object F, such as a user's finger, is in contact with or moved to the pixel area PA, as shown in FIG. 10, the illumination light R illuminated from the backlight 300 is applied to the object F. Is reflected by. And the photo sensor element 32a provided in the liquid crystal panel 200 receives the reflected light H.

More specifically, first, in the backlight 300, as shown in FIG. 10, the light D1 emitted from the light source 301 is guided by the light guide plate 302.

In the present embodiment, the light D1 emitted from the light source 301 includes both visible light VR and infrared light IR and is guided by the light guide plate 302 as described above.

Light D1 generated from the light source 301 propagates to the infrared reflecting layer 305 provided on the rear surface of the light guide plate 302.

11 and 12 are side views conceptually showing shapes when light D1 emitted from the light source 301 is incident on the infrared reflecting layer 305 in the first embodiment of the present invention. Specifically, FIG. 11 illustrates a case where light D1 is incident on the infrared reflecting pigment particles PG included in the infrared reflecting layer 305. 12 illustrates a case in which light D1 generated by the light source 301 does not enter the infrared reflecting pigment particles PG included in the infrared reflecting layer 305 in the first embodiment of the present invention.

As shown in FIG. 11, in the infrared reflecting layer 305, infrared reflecting pigment particle PG is disperse | distributed to transparent binder resin TJ. As shown in FIG. 11, light D1 including visible light VR and infrared light IR is incident on the infrared reflecting layer 305.

When the visible light VR included in the light D1 is incident on the infrared reflecting pigment particles PG of the infrared reflecting layer 305, the visible light VR is not reflected by the infrared reflecting pigment particles PG and is absorbed. do.

In contrast, when the infrared ray IR included in the light D1 is incident on the infrared reflecting pigment particles PG, the infrared ray IR is reflected by the infrared reflecting pigment particles PG. In this case, as shown in FIG. 11, infrared reflecting pigment particle PG is reflected by infrared reflecting pigment particle PG, and it is thought that it diffuses in various directions. And the infrared ray IR reflected by the infrared reflecting pigment particle PG reflects on the reflecting surface of the reflecting film 304. FIG. Although not shown, the infrared ray IR reflected by the infrared reflecting pigment particles PG is considered to reflect at the interface of the infrared reflecting layer 305.

On the other hand, as shown in FIG. 12, when the light D1 does not enter the infrared reflecting pigment particles PG by the infrared reflecting layer 305, the light D1 transmits through the transparent binder resin TJ, Reflected at the reflective surface of the reflective film 304.

That is, the visible light VR included in the light D1 is transmitted through the infrared reflecting layer 305 and reflected by the reflecting surface of the reflecting film 304. In addition, the infrared ray IR included in the light D1 penetrates the infrared reflecting layer 305 to reflect at the reflecting surface of the reflecting film 304. In addition, at the interface of the infrared reflecting layer 305, it is considered that the light D1 including some other visible light VR and infrared light IR is reflected.

Therefore, as shown in FIG. 10, since some visible light VR included in the light source D1 generated by the light source 301 is absorbed by the light guide plate 302, the visible light included in the light D1 ( VR) amount is reduced. Therefore, more infrared light IR than the visible light VR travels to the back surface of the liquid crystal panel 200.

And in the area | region which reflects infrared rays, reflection of visible light is not necessary. However, it is necessary to separately print the dots reflecting the visible light in the dot areas reflecting the infrared rays. Dots reflecting visible light are not shown in the figure. In accordance with the absorption characteristics of the visible light of the infrared reflecting material, in order to prevent lowering of the light brightness, the dot reflecting the visible light is optimally designed by the size and density of the dot so that the visible light is uniform.

As shown in FIG. 10, the visible light VR is reduced, and the light D2 containing a large amount of infrared light IR is emitted from the exit surface PS1 of the light guide plate 302 to form the optical film 303. Is incident on. In the optical film 303, the diffusion sheet 303a diffuses the light D2. The prism sheet 303b collects the diffused light D2 along the normal direction z perpendicular to the emission surface PS1 of the light guide plate 302, and emits the light D2 to the liquid crystal panel 200 as the illumination light R. FIG. Therefore, the optical film 303 uniformly emits the light D2 generated by the emission surface PS1 of the light guide plate 302 as the irradiation light R to the rear surface of the liquid crystal panel 200.

The illumination light R generated by the backlight 300 passes through the liquid crystal panel 200, is then irradiated onto the object F and is reflected by the object F. As shown in FIG. As described above, since the infrared half layer 305 reflects only the infrared ray IR, the illumination light R emitted by the backlight 300 includes more infrared rays IR than visible rays VR. Therefore, the reflected light H reflected by the object F includes more infrared rays IR than the visible rays VR. In the present embodiment, as a result of the reflection used in the biometric authentication process based on the many infrared rays IR included in the reflected light H, in the blood flowing through the veins of the finger of the person F being the subject F, the illumination light ( R) is reflected.

In the light receiving area SA provided in the sensor area RA of the liquid crystal panel 200, the reflected light H reflected by the detector F is directed to the light receiving surface JSa of the photo sensor element 32a. And the photo sensor element 32a receives the reflected light H which goes to the light receiving surface JSa of the photo sensor element 32a in the light receiving area SA.

The photoelectric sensor 32a receives photoelectric conversion and photoelectrically converts the reflected light H toward the light receiving surface JSa, thereby generating light receiving data having a signal intensity corresponding to the received light amount. Thereafter, the light reception data is read by the peripheral circuit.

Next, as described above, the biometric authentication unit 402 is located in the pixel area PA on the front side of the liquid crystal panel 200 by using the light reception data read from the photo sensor element 32a ( The image of F) is imaged and biometric authentication is performed from the image.

As described above, in the present embodiment, the infrared reflecting layer 305 reflects the infrared ray IR from the back side of the liquid crystal panel 200 to the front side in the light guide plate 302. Here, the infrared reflecting layer 305 is provided so as to correspond to the sensor region RA in which the plurality of photo sensor elements 32a are formed by the pixel region PA, and the infrared ray IR reflected by the infrared reflecting layer 305. ), The illumination light R is emitted from the emission surface PS1. Therefore, the photo sensor element 32a incorporated in the liquid crystal panel 200 receives the reflected light H reflected by the detector F by the illumination light R containing a lot of infrared rays IR, and receives the light. Generate data. Therefore, in this embodiment, since the S / N ratio of the electrical signal representing the light receiving data can be improved, biometric authentication can be performed with high accuracy.

When biometric authentication is performed according to the light-receiving data obtained from the blood using the visible light VR, the ratio of the visible light VR reflected in the blood is small, so that it may be difficult to perform biometric authentication with high accuracy. However, in this embodiment, since infrared ray IR with a large ratio reflected by blood is used, the biometric authentication process is generated from the visible ray VR contained in the light H reflected by the blood flowing to a finger. It is more effective when performed based on the light receiving data.

<2nd Example>

Hereinafter, a second embodiment of the present invention will be described.

13 is a cross-sectional view schematically showing the backlight 300b in the second embodiment of the present invention, and FIG. 14 is a perspective view schematically showing the backlight 300b in the second embodiment of the present invention.

13 and 14 and the diffraction grating instead of the infrared reflecting layer 305 of the first embodiment in the second embodiment, so as to be understood in comparison with FIGS. 7 and 8 provided by the first embodiment. A part 305KK is provided. The second embodiment is the same as the first embodiment except that the diffraction grating portion 350KK is used instead of the infrared reflecting layer 305. Therefore, description of overlapping portions is omitted.

In the backlight 300b, the diffraction grating part 305KK is provided in the bottom surface PS2 located in the light guide plate 302 on the opposite side to the emission surface PS1 as shown in FIG. The diffraction grating portion 305KK of the light guide plate 302 diffracts the light generated by the light source 301, guides it to the light guide plate 302, and emits the diffracted light to the reflective film 304. Then, the light diffracted by the diffraction grating portion 305KK of the light guide plate 302 and guided is reflected by the reflective film 304.

In the present embodiment, the diffraction grating portion 305KK is configured to selectively emit only the infrared light emitted from the infrared light source 301b of the light source 301 to the reflective film 304. The diffraction grating portion 305KK is provided so as to correspond to the region in which the plurality of photo sensor elements 32a are formed by the pixel region PA, similarly to the infrared reflecting layer 305 of the first embodiment.

As shown in Fig. 14, a plurality of diffraction grating portions 305KK are formed, and the plurality of diffraction grating portions 305KK are provided on the light guide plate 302 at intervals from each other in the plane direction. More specifically, the diffraction grating portion 305KK is arranged in a matrix in the x direction and the y direction, as shown in FIG. 14. In this case, the diffraction grating portion 305KK is located at the center portion of the bottom surface PS2 of the light guide plate 302.

15 is an enlarged perspective view of the diffraction grating portion 305KK in the second embodiment of the present invention.

As shown in FIG. 15, the diffraction grating portion 305KK extends in the y direction at the bottom surface PS2 of the light guide plate 302, and the grating pattern is formed to include a plurality of linear line patterns LP. . In this grating pattern, the line patterns LP of the diffraction grating portions 305KK are parallel to each other, are periodically arranged in the x direction, and are spaced apart from each other by the space SP.

When only light of a specific wavelength is selectively emitted from the light guide plate 302 to the reflective film 304, the diffraction grating portion 305KK is formed so as to be the pitch d of the grating pattern calculated from Equation 1 below, for example. In Equation 1, d is the pitch of the grating pattern, θ is the incident angle of the light beam reaching the diffraction grating portion 305KK, and λ is the wavelength of the incident light.

[Equation 1]

2dsinθ = λ

For example, in the present embodiment, the diffraction grating portion 305KK has a space SP of which the width L of the line pattern LP is set to 0.4 µm and is located between two adjacent line patterns LP. ) Width is set to 0.6 mu m, and the height h of the line pattern LP is formed to be 1 mu m.

For example, the diffraction grating portion 305KK is provided on the bottom surface PS2 of the light guide plate 302 so as to be integrally molded with the light guide plate 302. More specifically, in order to integrally mold the diffraction grating portion 305KK with the light guide plate 302, after injecting a molding material such as an acrylic resin into the mold, the mold is cooled and solidified, whereby the diffraction grating portion 305KK is formed into a light guide plate ( 302 is installed on the bottom surface PS2.

Hereinafter, when the user's finger touches or approaches the pixel area PA of the liquid crystal panel 200 as the object F, according to the received light data obtained from the reflected light H reflected by the object F The operation in the second embodiment for performing biometric authentication processing will be described.

FIG. 16 is a liquid crystal display device 100b according to the second embodiment of the present invention, when the user's finger as the detector F touches or approaches the pixel area PA of the liquid crystal panel 200. It is sectional drawing which shows typically the state at the time of biometric authentication according to the light reception data obtained from the reflected light H reflected by the to-be-detected body F. As shown in FIG. 16 shows only elements related to the biometric authentication process, and other elements are omitted.

When an object F such as a user's finger is in contact with the pixel area PA, the illumination light R generated by the backlight 300b is reflected by the object F as shown in FIG. 16. Then, it is received by the photo sensor element 32a as the reflected light H. In the liquid crystal panel 200, the reflected light H is received by the photo sensor element 32a.

More specifically, first, in the backlight 300b, as shown in FIG. 16, the light D1 emitted from the light source 301 by the light guide plate 302 is guided.

In the present embodiment, the light D1 emitted from the light source 301 includes the visible light VR and the infrared light IR as described above.

The diffraction grating portion 305KK is configured to selectively reflect only infrared ray IR. Therefore, the diffraction grating portion 305KK provided on the rear surface of the light guide plate 302 (that is, the bottom surface PS2) emits only infrared light IR, which is irradiated to the light D1 generated by the light source 301. It is included, it is guided by the light guide plate 302, reaches the diffraction grating part 305KK, and reaches the reflecting film 304 as light D2.

After the light D2 emitted by the diffraction grating portion 305KK is reflected by the reflective film 304, the light D2 is emitted from the exit surface PS1 of the light guide plate 302 and enters the optical film 303. do. In the optical film 303, the light D2 emitted by the diffraction grating portion 305KK, reflected by the reflective film 304, and emitted from the exit surface PS1 of the light guide plate 302 is diffused. 303a) diffuses. On the other hand, the prism sheet 303b condenses the light D2 diffused by the light guide plate 302 along the normal line direction z perpendicular to the exit surface PS1 of the light guide plate 302. Therefore, the optical film 303 uniformly emits the illumination light D2 generated by the emission surface PS1 of the light guide plate 302 to the liquid crystal panel 200 as planar light R. As shown in FIG.

The illumination light R emitted by the prism sheet 303b of the backlight 300b passes through the liquid crystal panel 200, is then irradiated onto the object F, and the reflected light H is detected by the object F. Is reflected. Here, as described above, since the illumination light R emitted from the backlight 300b is light in which only the infrared ray IR is selectively emitted by the diffraction grating portion 305KK, the prism sheet 303b of the backlight 300b is used. The illumination light R emitted by) contains more infrared light IR than visible light VR. Therefore, the reflected light H reflected by the object F also contains more infrared light IR than visible light VR. In the case of the second embodiment, as in the first embodiment, a human finger is used as the object F, blood flowing through the veins of the finger reflects the illumination light R, and many infrared rays contained in the reflected light H. Based on the IR, the reflected light H is emitted as a result of the reflection used for the biometric authentication process.

The photo where the reflected light H reflected by the detector F through the light receiving area SA provided in the sensor area RA of the liquid crystal panel 200 is at a position corresponding to the position of the light receiving area SA. The light receiving surface JSa of the sensor element 32a is directed. Then, the photo sensor element 32a receives the reflected light H directed toward the light receiving surface JSa.

The photoelectric sensor 32a receives the photosensitive light H directed toward the light receiving surface JSa of the photo sensor element 32a at the light receiving surface JSa and performs photoelectric conversion, so that electricity having the intensity corresponding to the amount of light of the reflected light H is photoelectrically converted. Generates light reception data of the signal. Thereafter, the data processing block 400 serving as a peripheral circuit reads the light reception data from the photo sensor element 32a.

Next, as described above, the biometric authentication unit 402 is located in the pixel area PA on the front side of the liquid crystal panel 200 by using the light reception data read from the photo sensor element 32a. The image of (F) is imaged, and biometric authentication is performed from the image.

As described above, in the present embodiment, only the infrared ray IR guided by the light guide plate 302 selectively emits the diffraction grating portion 305KK to the reflective film 304, and the reflective film 304 is the liquid crystal panel. It reflects from the back side of 200 to the front side. The diffraction grating portion 305KK is provided so as to correspond to the sensor region RA in which the plurality of photo sensor elements 32a are formed in the pixel region PA. The illumination light R is a light containing more infrared rays IR reflected by the diffraction grating portion 305KK and the reflective film 304 than the visible light VR reflected only by the reflective film 304. And exit from the exit surface PS1 of the light guide plate 302. As a result, the photo sensor element 32a receives the reflected light H which contains more infrared light IR than visible light VR. The photo sensor element 32a generates light-receiving data from the reflected light H that includes more infrared light IR than visible light VR. Therefore, the present embodiment can improve the S / N ratio of the electric signal having the intensity indicating the light reception data. As a result, in this embodiment, biometric authentication processing based on infrared light IR can be performed with higher precision.

<Third Example>

Hereinafter, a third embodiment according to the present invention will be described.

17 is a cross-sectional view showing the configuration of a liquid crystal display device 100c according to a third embodiment of the present invention. 18 is a cross-sectional view schematically showing the backlight 300c used in the third embodiment of the present invention. 19 is a perspective view schematically showing the backlight 300c used in the third embodiment of the present invention.

As shown in FIG. 17, the third embodiment differs from the first embodiment in that the front light 500 is provided. 18 and 19, the configuration of the backlight 300c used in the third embodiment is different from that of the backlight 300 used in the first embodiment.

In the liquid crystal display device 100c of the third embodiment, as illustrated in FIG. 17, the front light 500 is provided in addition to the liquid crystal panel 200, the backlight 300c, and the data processing unit 400.

As shown in FIG. 17, the front light 500 is disposed to face the front surface of the liquid crystal panel 200.

Specifically, the front light 500 of the liquid crystal panel 200 is located closer to the counter substrate 202 used for the liquid crystal panel 200 than the TFT array substrate 201 constituting the liquid crystal panel 200. It is arranged outside. The front light 500 irradiates the illumination light RF to the surface on the opposite side to the side facing the liquid crystal panel 200. That is, the front light 500 illuminates the illumination light RF along the direction from the TFT array substrate 201 side toward the opposing substrate 202 side. The front light 500 emits the illumination light RF along the normal direction z that is perpendicular to the plane of the liquid crystal panel 200.

20 is a cross-sectional view schematically showing the front light 500 used in the third embodiment of the present invention. Fig. 21 is a perspective view showing main elements constituting the front light 500 used in the third embodiment of the present invention.

As shown in FIG. 20, the front light 500 includes a light source 501 and a light guide plate 502, and emits illumination light RF so as to correspond to the pixel area PA of the liquid crystal panel 200.

As shown in FIG. 20, the light source 501 includes an irradiation surface ES for irradiating light, so that the irradiation surface ES faces the incident surface IS on which the light is incident on the light guide plate 502. It is arranged. That is, the irradiation surface ES of the light source 501 faces the incident surface IS provided in the side surface of the light guide plate 502. The light source 501 is configured to be supplied with a control signal from the control unit 401 and to perform a light emission operation according to the control signal.

In this embodiment, the light source 501 is equipped with the infrared light source 501b, as shown in FIG.

The infrared light source 501b is, for example, an infrared LED and is configured to generate infrared rays. As shown in FIG. 21, this infrared light source 501b is arrange | positioned so that the irradiation surface ES may face the incidence surface IS of the light guide plate 302, and the incidence surface IS of the light guide plate 302 will be carried out. Infrared rays are irradiated from the irradiation surface ES. For example, the infrared light source 501b emits infrared light having a center wavelength of 850 nm. As a general configuration of this embodiment, there are a plurality of infrared light sources 501b, and the plurality of light sources 501b are arranged in alignment with the incident surface IS of the light guide plate 302.

As shown in FIG. 20, the light guide plate 502 is formed so that the irradiation surface ES of the light source 301 may face the incident surface IS, and the light irradiated from the irradiation surface ES is incident. The light guide plate 502 causes light to enter the incident surface IS so as to be generated from the exit surface PS1 of the light guide plate 502 as the illumination light RF described above. The emission surface PS1 is provided perpendicular to the incident surface IS. The light guide plate 502 is provided on the front side of the liquid crystal panel 200 so as to face the front side of the liquid crystal panel 200. The illumination light RF is generated by the emission surface PS1 in a direction opposite to the direction toward the front of the liquid crystal panel 200. The light guide plate 502 made of a transparent material having high light transmittance functions as an exiting light guide plate. An example of a transparent material having high light transmittance is an acrylic resin.

In the present embodiment, the light guide plate 502 enters the infrared ray emitted from the infrared light source 501b to the incident surface IS and guides the infrared ray incident from the incident surface IS. The guided infrared light is emitted as illumination light RF from the emission surface PS1.

As shown in FIG. 20, the light guide plate 502 is provided with a plurality of infrared reflecting layers 505.

As shown in FIG. 20, the infrared reflecting layer 505 is formed on the bottom surface PS2 located on the side opposite to the emitting surface PS1 in the light guide plate 502, and constitutes the infrared light source 501. It is configured to selectively reflect only infrared light emitted from 501b).

Specifically, the infrared reflecting layer 505 has only the infrared rays generated by the infrared light source 501b used for the light source 501 in a direction parallel to the direction from the back side to the front side of the liquid crystal panel 200. Selectively reflects. The infrared reflecting layer 505 is provided so as to correspond to the region where the plurality of photo sensor elements 32a are formed by the pixel region PA, and the infrared light reflected by the infrared reflecting layer 505 is emitted as the illumination light RF. It exits from the surface PS1.

As shown in Fig. 21, a plurality of infrared reflecting layers 505 are formed, and the plurality of infrared reflecting layers 505 are provided in a dot shape at intervals from each other in the plane direction. Specifically, as shown in FIG. 21, the infrared reflecting layer 505 has a circular shape and is arranged in a matrix in the x direction and the y direction. The infrared reflecting layer 505 is the bottom surface PS2 of the light guide plate 502 similarly to the infrared reflecting layer 305 provided in the center of the bottom surface PS2 of the light guide plate 302 of the backlight 300 in the first embodiment. It is installed in the center part of).

As shown in FIG. 18, the backlight 300c includes a light source 301 and a light guide plate 302. The backlight 300c emits the illumination light R to illuminate the entire surface of the pixel area PA of the liquid crystal panel 200.

As shown in FIG. 18, the light source 301 includes an irradiation surface ES for irradiating light, and the irradiation surface ES faces the incident surface IS on which the light is incident on the light guide plate 302. It is arranged. The irradiation surface ES of the light source 301 is facing the incident surface IS provided on the side surface of the light guide plate 302. The control signal is supplied from the control part 401 to the light source 301, and is comprised so that light emission operation | movement may be performed according to the control signal.

In the present embodiment, as shown in FIG. 19, the light source 301 includes the visible light source 301a, but unlike the first embodiment, the light source 301 does not include the infrared light source 301b.

The visible light source 301a is, for example, a white LED and is configured to emit white visible light. As shown in FIG. 18, the visible light source 301a is arrange | positioned so that the irradiation surface ES may face the incidence surface IS of the light guide plate 302, and irradiates the incidence surface IS of the light guide plate 302. Visible light is irradiated from the surface ES. There are a plurality of visible light sources 301a, and the plurality of visible light sources 301a are arranged to be aligned on the incident surface IS of the light guide plate 302.

As shown in FIG. 18, the light guide plate 302 is formed so that the irradiation surface ES of the light source 301 may face the incidence surface IS, similarly to the first embodiment, and from the irradiation surface ES The irradiated light is incident. The light guide plate 302 guides light incident on the incident surface IS. The guided light is emitted as the illumination light R from the emission surface PS1 provided so as to be perpendicular to the incident surface IS. The light guide plate 302 is disposed to face the rear surface of the liquid crystal panel 200, and emits the illumination light R from the emission surface PS1 toward the rear surface of the liquid crystal panel 200.

Specifically, in the present embodiment, in the light guide plate 302, the visible light emitted from the visible light source 301a is incident on the incident surface IS and guides the visible light incident on the incident surface IS. The guided visible light is emitted as the illumination light R from the emission surface PS1 to the liquid crystal panel 200. As a result, an image is displayed in the pixel area PA of the transmissive liquid crystal panel 200 described above.

As shown in FIG. 18, the light guide plate 302 includes the optical film 303 and the reflective film 304, but unlike the first embodiment, the infrared reflective layer 305 is not provided.

As shown in FIG. 18, the optical film 303 is provided to face the emission surface PS1 in the light guide plate 302 as in the first embodiment. In the present embodiment, the optical film 303 includes a diffusion sheet 303a and a prism sheet 303b. In the light guide plate 302, the diffusion sheet 303a is formed on the emission surface PS1, and the prism sheet 303b is formed on the diffusion sheet 303a. In the light guide plate 302, the diffusion sheet 303a diffuses the light emitted from the exit surface PS1 of the light guide plate 302, and the prism sheet 303b transmits the diffused light to the exit surface PS1 of the light guide plate 302. The light is focused in a normal normal direction (z). Thereby, the optical film 303 emits the light radiate | emitted from the emission surface PS1 of the light guide plate 302 to the back surface of the liquid crystal panel 200 as illumination light R of planar light.

As shown in FIG. 18, the reflective film 304 is provided to face the bottom surface PS2 located on the side opposite to the exit surface PS1 in the light guide plate 302. The reflective film 304 receives a part of the light emitted from the bottom surface PS2 located on the opposite side to the exit surface PS1 in the light guide plate 302 and reflects it toward the exit surface PS1 of the light guide plate 302. .

Hereinafter, when the user's finger touches or approaches the pixel area PA of the liquid crystal panel 200 as the object F, the living body is generated according to the light receiving data obtained by receiving light reflected by the object F. The operation at the time of authentication is demonstrated.

FIG. 22 is a reflection of the object F when the user's finger touches or approaches the pixel area PA of the liquid crystal panel 200 in the third embodiment according to the present invention. It is sectional drawing which showed typically the state at the time of biometric authentication by the liquid crystal display device 100c according to the light reception data obtained by receiving the light to become. 22 shows only components related to the biometric authentication process, and other elements are omitted.

When the object F, such as a user's finger, contacts the pixel area PA, as shown in FIG. 22, the illumination light RF illuminated from the front light 500 is reflected by the object F. The light returns to the photo sensor element 32a as reflected light HF. In the liquid crystal panel 200, this reflected light HF is received by the photo sensor element 32a.

Specifically, first, as shown in FIG. 22, the light D1 emitted from the light source 501 is guided by the light guide plate 502.

In the present embodiment, the light D1 emitted from the light source 501 is guided by the light guide plate 502, including the infrared ray IR, as described above.

The infrared reflecting layer 505 is configured not to reflect the visible light VR but to selectively reflect only the infrared light IR. Accordingly, the infrared light IR generated by the light source 501 and guided by the light guide plate 502 to reach the infrared reflecting layer 505 provided on the rear surface of the light guide plate 502 is guided by the infrared reflection layer 505. It is selectively reflected to the emission surface PS1 of 502. That is, the infrared reflecting layer 505 reflects only the infrared ray IR included in the light D1 on the emission surface PS1 of the light guide plate 502.

The light D2 reflected by the infrared reflecting layer 505 is emitted as illumination light RF from the emission surface PS1 of the light guide plate 502.

Illumination light RF radiated | emitted by the front light 500 is irradiated to the to-be-detected object F, and is reflected by the to-be-detected object F. FIG. As described above, since the illumination light RF emitted from the front light 500 is light in which only the infrared ray IR is selectively reflected by the infrared reflection layer 505, the reflected light reflected by the object F is reflected ( HF) also contains a lot of infrared rays (IR). Therefore, in this embodiment, illumination light RF is reflected by the blood which flows through a vein from the finger which is the object F, and is used for biometric authentication process based on many infrared rays IR contained in the reflected light H. The reflected light H is emitted as a result of the reflected reflection.

In the light receiving area SA provided in the sensor area RA of the liquid crystal panel 200, the reflected light HF reflected by the detector F is directed to the light receiving surface JSa of the photo sensor element 32a. And the photo sensor element 32a receives the reflected light HF which goes to the light receiving surface JSa of the photo sensor element 32a in the light receiving area SA. Here, as shown in FIG. 22, in the light receiving area SA provided in the sensor area RA, the photo sensor element 32a receives the reflected light HF which enters from the part in which the infrared reflecting layer 505 is not provided. do.

Then, the photo sensor element 32a receives the photoelectric sensor Ja on the light receiving surface JSa and photoelectrically converts the reflected light HF toward the light receiving surface JSa, thereby generating light receiving data having a signal intensity corresponding to the received light amount. Thereafter, the light receiving data is read out by the peripheral circuit.

Next, as described above, the biometric authentication unit 402 is located in the pixel area PA on the front side of the liquid crystal panel 200 using the light-receiving data read from the photo sensor element 32a ( Imaging is performed to generate an image of F), and biometric authentication is performed from the imaged image.

As described above, in the present embodiment, the infrared reflecting layer 505 of the light guide plate 502 reflects the infrared ray IR along the direction from the rear side to the front side of the liquid crystal panel 200. The infrared reflecting layer 505 is provided to correspond to the sensor region RA in which the plurality of photo sensor elements 32a are formed by the pixel region PA, respectively. Accordingly, the illumination light RF is emitted from the emission surface PS1 of the plurality of light guide plates 502 as light containing a lot of infrared rays IR reflected by the infrared reflection layer 505. Therefore, the photo sensor element 32a mainly receives the reflected light HF including the infrared ray IR. The photo sensor element 32a generates light reception data from the reflected light HF mainly containing infrared light IR. Thus, similarly to the first embodiment, the third embodiment can improve the S / N ratio of the electric signal having the intensity indicating the light reception data. As a result, the third embodiment can perform the biometric authentication process based on the infrared ray IR with high precision.

<Fourth Example>

Hereinafter, a fourth embodiment according to the present invention will be described.

Fig. 23 is a sectional view schematically showing the front light 500d used in the fourth embodiment of the present invention. 24 is a perspective view schematically showing the main elements of the front light 500d used in the fourth embodiment of the present invention.

23 and 24, the configuration of the light guide plate 502d of the front light 500d is different from that of the light guide plate 502 used in the front light 500 of the third embodiment. Except for this point, the fourth embodiment is basically the same as the third embodiment. Therefore, only the differences between the third embodiment and the fourth embodiment will be described, and descriptions of overlapping portions will be omitted.

23 and 24, in the fourth embodiment, the light guide plate 502d is provided with a prism surface 505P as an infrared ray reflecting portion instead of the infrared reflecting layer 505.

As shown in FIG. 23, the prism surface 505P is formed on the bottom surface PS2 located on the side opposite to the emission surface PS1 in the light guide plate 502d, and constitutes an infrared light source 501. Only infrared light emitted from 501b) is selectively reflected.

The prism surface 505P is formed by adjusting the angle of the inclined surface so as to selectively reflect infrared rays along the direction from the back side to the front side of the liquid crystal panel 200. Specifically, the inclination angle of the prism surface 505P is adjusted according to the incident angle of the incident infrared light. For example, when forming the light guide plate 502d, the prism face 505P is formed on the light guide plate 502d by simultaneously molding the prism face 505P. The prism surface 505P is provided so as to correspond to the region where the plurality of photo sensor elements 32a are formed by the pixel region PA, and the infrared light reflected by the prism surface 505P is used as the illumination light RF. It exits from the exit surface PS1.

As shown in FIG. 23 and FIG. 24, the prism surface 505P is provided in plurality in the light guide plate 502d. Prism surface 505P is provided in the center part of bottom surface PS2 of light guide plate 502d.

Hereinafter, when the user's finger as the object F comes into contact with or comes close to the pixel area PA of the liquid crystal panel 200, according to the light reception data obtained by receiving light reflected by the object F. The operation at the time of biometric authentication will be described.

FIG. 25 shows the detection object F when the user's finger touches or approaches the pixel area PA of the liquid crystal panel 200 according to the fourth embodiment of the present invention. It is sectional drawing which showed typically the shape at the time of biometric authentication according to the light reception data obtained by receiving light reflected. In FIG. 25, only main components included in the biometric authentication process are described, and other portions are omitted.

When the detected object F, such as a user's finger, comes into contact with or approaches the pixel area PA, as shown in FIG. 25, the illumination light RF illuminated from the front light 500 is similar to that of the third embodiment. The object F is reflected. And the photo sensor element 32a provided in the liquid crystal panel 200 receives the reflected light HF.

More specifically, as shown in FIG. 25, the light D1 generated by the light source 501 in the front light 500d is guided by the light guide plate 502d and directed to the prism face 505P. In the fourth embodiment, the light D1 generated by the light source 501 and guided by the light guide plate 502d includes infrared ray IR, as described above. The prism face 505P is configured to reflect only the infrared ray IR, not the visible light VR in the normal line direction z perpendicular to the bottom surface PS2 on which the prism face 505P is provided. Thus, the light D1 generated by the light source 501 and guided by the light guide plate 502d.

In the light D1 emitted from the light source 501, the light D1 directed to the prism surface 505P provided on the rear surface of the light guide plate 502d has an infrared ray whose prism surface 505P is larger than the visible light VR. IR) is selectively configured to reflect in the normal direction z. Thus, the light D1 generated by the light source 501 and guided by the light guide plate 502d to reach the prism surface 505P provided on the bottom surface PS2 serving as the back surface of the light guide plate 502 is the prism surface. It is selectively reflected by 505P to reach the exit surface PS1 of the light guide plate 502. Next, the light D2 reflected by the infrared reflecting layer 505 to the emission surface PS1 of the light guide plate 502 is emitted from the emission surface PS1 as the illumination light RF.

Then, similarly to the first embodiment, the illumination light RF emitted from the front light 500 is irradiated onto the object F, and reflected by the object F as the reflected light HF. In the light receiving area SA provided in the sensor area RA of the liquid crystal panel 200, the reflected light HF reflected by the detector F faces the light receiving surface JSa of the photo sensor element 32a. The photo sensor element 32a receives the light.

The reflected light HF received by the photo sensor element 32a and directed toward the light receiving surface JSa of the photo sensor element 32a is a photoelectric conversion of the reflected light HF into an electrical signal having an intensity corresponding to the light amount of the reflected light HF. do. Thereafter, the light receiving data is read out by the peripheral circuit.

And similarly to the first embodiment, the biometric authentication unit 402 is placed in the pixel area PA on the front side of the liquid crystal panel 200 by using the light reception data read from the photo sensor element 32a. The image of the member F is subjected to an imaging process and biometric authentication is performed from the image subjected to the imaging process.

As described above, in the fourth embodiment, the prism surface 505P is reflected in the light guide plate 502d along the direction from the rear side to the front side of the liquid crystal panel 200. The prism surface 505P is provided so as to correspond to the sensor region RA in which the plurality of photo sensor elements 32a are formed by the pixel region PA, and the infrared ray IR reflected by the prism surface 505P is provided. Including illumination light RF is radiate | emitted from the emission surface PS1. Therefore, the photo sensor element 32a built in the liquid crystal panel 200 receives the reflected light HF reflected by the detection object F from the illumination light RF including a lot of the infrared ray IR. Generate the light receiving data. Therefore, in the fourth embodiment, similarly to the third embodiment, since the S / N ratio of the electrical signal representing the light receiving data can be improved, biometric authentication can be performed with high accuracy.

<Fifth Embodiment>

The fifth embodiment of the present invention will be described below.

26 is a cross-sectional view showing the configuration of a liquid crystal display device 100e according to a fifth embodiment of the present invention. 27 is a cross-sectional view schematically showing the pixel P provided in the pixel area PA of the liquid crystal panel 200e used in the fifth embodiment of the present invention. FIG. 27 is a part corresponding to the X1-X2 part in FIG. 4 similarly to FIG.

As can be seen by comparing FIG. 26 showing the liquid crystal display device 100e of the fifth embodiment with FIG. 17 showing the liquid crystal display device 100c of the third embodiment, the liquid crystal display device 100e controls the backlight 300c. The point which is not provided differs from liquid crystal display device (c). In addition, as can be seen when the configuration of the liquid crystal panel 200e according to the fifth embodiment is compared with the configuration of the liquid crystal panel 200 according to the third embodiment, the liquid crystal panel 200e uses the pixel electrode 62. In use, the liquid crystal panel 200e is different from the liquid crystal panel 200. Except for this point, the fifth embodiment is basically the same as the third embodiment. Therefore, only the differences between the fifth embodiment and the third embodiment will be described, and descriptions of overlapping portions will be omitted.

In the liquid crystal display device 100e of the fifth embodiment, as shown in FIG. 26, the liquid crystal panel 200e, the data processing unit 400, and the front light 500 are provided, but the backlight 300 is not provided. not. The configuration of the data processing unit 400 and the front light 500 is the same as in the third embodiment.

The pixel electrode 62H used for the liquid crystal panel 200e is not a transparent electrode that transmits light like the pixel electrode 62 used in the third embodiment, but a reflective electrode that reflects light. For example, the pixel electrode 62H is formed using silver. That is, the liquid crystal panel 200e is not a transmissive type but a reflective type, and is configured so that image display is performed by the pixel electrode 62H serving as the reflective electrode reflecting light incident from the front side. Except for this difference between the pixel electrode 62H used for the liquid crystal panel 200e and the pixel electrode 62 used for the liquid crystal panel 200, the liquid crystal panel 200e is characterized by the configuration of the liquid crystal panel 200. same.

In the liquid crystal display device 100e, when the user's finger as the object F touches or approaches the pixel area PA of the liquid crystal panel 200e, the light reflected by the object F is received. The operation at the time of biometric authentication according to the received light reception data is the same as the biometric authentication process according to the third embodiment.

That is, as shown in FIG.

The light D1 generated by the light source 501 and guided by the light guide plate 502 to reach the infrared reflecting layer 505 provided on the bottom surface PS2 serving as the back surface of the light guide plate 502 is the infrared reflecting layer 505. ) Is selectively reflected to reach the exit surface PS1 of the light guide plate 502. That is, the infrared reflecting layer 505 reflects only the infrared ray IR included in the light D1 to the emission surface PS1 of the light guide plate 502. Next, the light D2 reflected by the infrared reflecting layer 505 to the emission surface PS1 of the light guide plate 502 is emitted from the emission surface PS1 as the illumination light RF.

The illumination light RF generated by the front light 500 is irradiated to the subject F and reflected by the subject F as reflected light HF. As described above, since the infrared reflecting layer 505 reflects only the infrared ray IR, the illumination light RF generated by the front light 500 mainly includes the infrared ray IR. Therefore, the reflected light HF reflected by the detected object F mainly includes the infrared ray IR. In the fifth embodiment, a human finger is used as the detection object F, and blood flowing through the veins of the finger reflects the illumination light RF and emits the reflected light HF as a result of the reflection, thereby causing the reflected light HF. It is used for the biometric authentication process based on the infrared ray (IR) which is contained abundantly).

In the light receiving area SA provided in the sensor area RA of the liquid crystal panel 200e, the reflected light HF emitted by the detector F corresponds to the position of the light receiving area SA. The photo sensor element 32a receives the reflected light HF toward the light-receiving surface JSa of the photo sensor element 32a on the surface and reaching the light-receiving region JSa.

The reflected light HF directed to the light receiving region JSa of the photo sensor element 32a and received by the photo sensor element 32a is photoelectrically converted into an electric signal having an intensity corresponding to the light amount of the reflected light HF. The photo sensor element 32a generates an electrical signal having an intensity representing light reception data. Thereafter, the light receiving data is read by the peripheral circuit.

And similarly to the third embodiment, the biometric authentication unit 402 is placed in the pixel area PA on the front side of the liquid crystal panel 200e by using the light reception data read from the photo sensor element 32a. An image of the member F is imaged, and biometric authentication is performed from the image.

As described above, in the fifth embodiment, as in the third embodiment, the illumination light RF in which the photo sensor element 32a incorporated in the liquid crystal panel 200e contains a large amount of infrared rays IR is detected. The reflected light HF reflected by (F) is received, and light reception data is generated. Therefore, in the fifth embodiment, as in the third embodiment, the S / N ratio of the electrical signal representing the received light receiving data can be improved, so that biometric authentication can be performed with high accuracy.

<Sixth Example>

Hereinafter, a sixth embodiment of the present invention will be described.

28 is a cross sectional view showing a configuration of an EL display device 100E according to a sixth embodiment of the present invention.

As shown in Fig. 28, the sixth embodiment uses the EL panel 200E instead of the liquid crystal panel 200 of the fifth embodiment. That is, the sixth embodiment is similar to the fifth embodiment except that the EL panel 200E is used instead of the liquid crystal panel 200e.

29 is a cross-sectional view schematically showing a plurality of pixels P provided in a plurality of pixel areas PA of the EL panel 200E used in the sixth embodiment of the present invention.

As shown in FIG. 29, the EL panel 200E includes a substrate 201S. On the surface of the substrate 201S, a plurality of electroluminescent elements 31E and photo sensor elements 32a are formed. Like the liquid crystal panel 200 described above, the pixel area PA in which the plurality of pixels P are arranged in a matrix form is formed, and each of the electroluminescent element 31E and the photo sensor element 32a is a pixel ( It is formed so as to correspond to P). In the EL panel 200E, the electroluminescent element 31E is driven by active matrix driving, and image display is performed. In the EL panel 200E, similarly to the other embodiment, the photo sensor element 32a is driven to collect light reception data from the photo sensor element 32a.

The substrate 201S of the EL panel 200E is formed of an insulating material such as glass.

The electroluminescent element 31E is formed in the display area TA, and performs image display by emitting light. Although not shown, the electroluminescent element 31E is formed by laminating, for example, a cathode, an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, a hole injection layer, and an anode sequentially from the side of the substrate 201S. . Specifically, in the electroluminescent element 31E, light is emitted from the light emitting layer by applying a voltage between the cathode and the anode. More specifically, by applying a voltage between the cathode and the anode, the electrons and holes combine in the light emitting layer to generate energy, and the energy excites the light emitting material in the light emitting layer, and from the excited state back to the ground state. It is configured to generate light upon return.

In the sixth embodiment, the electroluminescent element 31E includes a red electroluminescent element 31ER, a green electroluminescent element 31EG, and a blue electroluminescent element 31EB, as shown in FIG. Then, the red electroluminescent element 31ER emits red light, the green electroluminescent element 31EG emits green light, and the blue electroluminescent element 31EB emits blue light.

As shown in FIG. 29, the photo sensor element 32a is provided in the sensor region RA associated with the photo sensor element 32a. The photo sensor element 32a receives light incident on the front side of the EL panel 200E, and generates light reception data indicating light received.

In the EL display device 100E, when a user's finger as the object F touches or approaches the pixel area PA of the EL panel 200E, the light is reflected by the object F by receiving the light. The operation at the time of biometric authentication according to the received light reception data is the same as the biometric authentication processing of the third embodiment.

Fig. 30 is a biometric authentication process of the EL display device 100E according to the sixth embodiment of the present invention, in which the user's finger as the detector F touches or approaches the pixel area PA of the EL panel 200E. It is sectional drawing which shows typically the pattern at the time of biometric authentication according to the light reception data obtained by receiving light reflected by the to-be-detected object F at this time. 30 shows only the components related to the biometric authentication process and omits other components.

As shown in FIG. 30, in the front light 500, the light D1 generated by the light source 501 and guided by the light guide plate 502 to reach the infrared reflective layer 505 is caused by the infrared reflective layer 505. Is selectively reflected. The infrared reflecting layer 505 selectively reflects only the infrared ray IR included in the light D1. Thereafter, the light D2 reflected by the infrared reflecting layer 505 on the emission surface PS1 of the light guide plate 502 is emitted as the illumination light RF.

Illumination light RF radiated | emitted by the front light 500 is irradiated to the to-be-detected object F, and is reflected by the to-be-detected object F. FIG. As described above, since the illumination light RF emitted from the front light 500 is light in which the infrared ray IR is selectively reflected by the infrared reflection layer 505, the reflected light reflected by the object F is reflected ( HF) also contains a lot of infrared rays (IR). In the sixth embodiment, the human finger is used as the object F, and the illumination light RF is reflected by blood flowing in the vein of the finger.

In the sensor area RA of the EL panel 200E, the reflected light HF reflected by the detector F is directed to the light receiving surface JSa of the photo sensor element 32a, and the reflected light HF is transferred to the photo. The sensor element 32a receives.

Then, the photo sensor element 32a photoelectrically converts the reflected light HF, thereby generating light-receiving data having a signal intensity corresponding to the received light amount. Thereafter, the light receiving data is read by the peripheral circuit.

Then, similarly to the third embodiment described above, the biometric authentication unit 402 uses the front light side of the EL panel 200E to the pixel area PA by using the light reception data read from the photo sensor element 32a. An image of the object F to be positioned is imaged, and biometric authentication is performed from the image.

As described above, in the sixth embodiment, similarly to the third embodiment, the illumination light RF in which the photo sensor element 32a incorporated in the EL panel 200E contains a lot of infrared rays IR is detected by the detected object F. FIG. The reflected light HF reflected by () is received, and light reception data is generated from the reflected light HF. Therefore, in the sixth embodiment, as in the third embodiment, the S / N ratio of the electric signal having the intensity indicating the light reception data can be improved, so that biometric authentication can be performed with high accuracy.

In addition, the scope of the present invention is not limited to the embodiment described above, and various modifications can be adopted.

For example, in the above-described embodiment, the case where the pixel switching element 31 is configured as a bottom-gate type thin film transistor has been described, but the present invention is not limited thereto, and the pixel switching element 31 is not limited thereto. May not be constituted by a bottom gate type thin film transistor.

31 is a cross-sectional view showing a modification of the configuration of the pixel switching element 31x as another embodiment of the present invention.

As shown in FIG. 31, a top-gate type TFT may be formed as the pixel switching element 31x. In addition, the photo sensor element 32a may be formed to have a dual gate structure.

In the present embodiment, the case where the plurality of photo sensor elements 32a are provided so as to correspond to the plurality of pixels P is shown, but the present invention is not limited thereto. For example, one photo sensor element 32a may be provided for the plurality of pixels P, or a plurality of photo sensor elements 32a may be provided for one pixel P. In addition, a plurality of photo sensor elements 32a may be provided in a part of the pixel area PA so as to correspond to the plurality of pixels P. FIG.

In the present embodiment, the case where the light receiving data generated by the photo sensor element 32a is used for the biometric authentication process has been described, but the present invention is not limited thereto. For example, in order to detect the position of the to-be-detected object F, you may use the light reception data produced by the photo sensor element 32a. In addition, the light reception data generated by the photo sensor element 32a can be used for various purposes.

In the above-described embodiments, the PIN type photodiode is used as the photo sensor element 32a, but the present invention is not limited thereto. For example, similar effects can be obtained even when a photodiode having a PDN structure doped with an impurity in the i layer is formed as the photo sensor element 32a. In addition, a photo transistor may be provided as the photo sensor element 32a.

In addition, in this embodiment, each of the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B is made into stripe shape, and is formed so that each may be aligned in the horizontal direction x. At the same time, the light receiving area SA is formed in the vicinity of the red filter layer 21R so as to be aligned with the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B. However, the present invention is not limited to this. For example, the red filter layer 21R, the green filter layer 21G, the blue filter layer 21B, and the light receiving area SA are set as one set, and the red filter layer 21R, the green filter layer 21G, and the blue filter layer 21B are set. ) And light receiving area SA may be arranged in a matrix form of two rows and two columns.

In addition, in this embodiment, although the case where illumination light is irradiated so that an infrared light is included as an invisible light was demonstrated, this invention is not limited to this. For example, you may irradiate illumination light so that an ultraviolet ray may be included as an invisible light ray.

Those skilled in the art will appreciate that various modifications, combinations, subcombinations and modifications are possible in accordance with the design requirements as long as they fall within the scope of the appended claims and their equivalents.

In addition, the display device such as the liquid crystal display device 100, 100b, 100c, 100d or 100e according to the embodiment of the present invention can be used as a display unit of various electronic devices.

32 is a display unit which displays an image of a TV broadcast received by a TV set on a display screen of a TV set, and receives and translates an operation command input by an operator on the display screen, wherein the liquid crystal display device 100, 100b is shown. , 100c, 100d or 100e). In addition, the liquid crystal display device 100, 100b, 100c, 100d or 100e generates light reception data from the light reflected by the detector F with respect to the liquid crystal display device 100, 100b, 100c, 100d or 100e. It can also be used as data used for biometric authentication processing.

33 is a digital still camera, which displays an image such as a captured image on a display screen, and can apply a liquid crystal display device 100, 100b, 100c, 100d or 100e as a display device to which an operation command of an operator is input. Represents a digital still camera. In addition, the liquid crystal display device 100, 100b, 100c, 100d or 100e generates light reception data from the light reflected by the detector F with respect to the liquid crystal display device 100, 100b, 100c, 100d or 100e. It can also be used as data used for biometric authentication processing.

Fig. 34 is a notebook personal computer, which displays an operation image or the like on a display screen and can apply a liquid crystal display device 100, 100b, 100c, 100d or 100e as a display device to which an operation command of an operator is input. Type personal computer. The liquid crystal display device 100, 100b, 100c, 100d or 100e generates light reception data from light reflected by the detector F with respect to the liquid crystal display device 100, 100b, 100c, 100d or 100e. Therefore, it can also be used as data used for biometric authentication processing.

Fig. 35 shows a mobile phone terminal which can display an operation image or the like on a display screen and can apply the liquid crystal display device 100, 100b, 100c, 100d or 100e as a display device to which an operation command of an operator is input. Represents a terminal. In addition, the liquid crystal display device 100, 100b, 100c, 100d or 100e generates light reception data from the light reflected by the detector F with respect to the liquid crystal display device 100, 100b, 100c, 100d or 100e. It can also be used as data used for biometric authentication processing.

Fig. 36 is a video camera which displays an operation image or the like on a display screen and can apply the liquid crystal display device 100, 100b, 100c, 100d or 100e as a display device to which an operation command of an operator is input. Indicates. In addition, the liquid crystal display device 100, 100b, 100c, 100d or 100e generates light reception data from the light reflected by the detector F with respect to the liquid crystal display device 100, 100b, 100c, 100d or 100e. It can also be used as data used for biometric authentication processing.

The display device such as the EL display device 100E according to the sixth embodiment of the present invention can be used as a display unit of various electronic devices similarly to the liquid crystal display device 100, 100b, 100c, 100d or 100e.

In addition, the present invention can be applied to liquid crystal panels of various systems such as IPS (In-Plane-Swiching) and FFS (Field Fringe Switching). The display device according to the present invention can also be applied to other display devices such as an electronic paper unit.

The liquid crystal display devices 100, 100b, 100c, 100d or 100e used in the present embodiment correspond to the display device of the present invention. Also, in the present embodiment, the EL display device 100E of the sixth embodiment corresponds to the display device of the present invention.

In addition, the liquid crystal panels 200, 200c, and 200e used in the embodiment of the present invention correspond to the display panel of the present invention. Also, in the embodiment of the present invention, the EL panel 200E of the sixth embodiment corresponds to the EL panel of the present invention.

Further, in this embodiment, the TFT array substrate 201 corresponds to the first substrate of the present invention, and the opposing substrate 202 of this embodiment corresponds to the second substrate of the present invention. In addition, the liquid crystal layer 203 used in the embodiment of the present invention corresponds to the liquid crystal layer of the present invention.

In the present embodiment, the backlights 300, 300b, and 300c correspond to the lighting unit or the lighting apparatus of the present invention. In addition, in this embodiment, the light source 301 corresponds to the light source of the present invention. Also, in this embodiment, the light guide plate 302 corresponds to the light guide plate of the present invention.

Also, in this embodiment, the visible light source 301a corresponds to the visible light source of the present invention. Also, in this embodiment, the infrared light source 301b corresponds to the invisible light source of the present invention.

In addition, in this embodiment, the reflective film 304 corresponds to the reflecting portion of the present invention, more strictly speaking, the invisible light reflecting portion.

Further, in this embodiment, the infrared reflecting layer 305 corresponds to the invisible light reflecting layer or the invisible light reflecting portion of the present invention. In addition, in the present embodiment, the diffraction grating portion 305KK corresponds to the diffraction grating portion or the invisible light reflecting portion of the present invention.

Also, in this embodiment, the biometric authentication unit 402 corresponds to the biometric authentication unit of the present invention.

In addition, in this embodiment, the front lights 500 and 500d correspond to the lighting unit or the lighting apparatus of the present invention. Also, in this embodiment, the light source 501 corresponds to the light source of the present invention. Also, in this embodiment, the light guide plates 502 and 502d correspond to the light guide plates of the present invention.

In addition, in this embodiment, the infrared light source 501b corresponds to the invisible light source of the present invention.

In addition, in this embodiment, the infrared reflecting layer 505 corresponds to the invisible light reflecting layer or the invisible light reflecting portion of the present invention. Also, in this embodiment, the prism face 505P corresponds to the prism face or the invisible light reflecting portion of the present invention.

In addition, in the present embodiment, the pixel area PA corresponds to the pixel area of the present invention. In addition, in this embodiment, the pixel P corresponds to the pixel of the present invention. Further, in this embodiment, the photo sensor element 32a corresponds to the photo sensor element of the present invention.

1 is a cross-sectional view showing the configuration of a liquid crystal display device according to a first embodiment of the present invention.

2 is a plan view showing a liquid crystal panel according to a first embodiment of the present invention.

3 is a cross-sectional view schematically showing pixels provided in a pixel region in a liquid crystal panel according to a first embodiment of the present invention.

4 is a plan view schematically showing a pixel provided in a pixel region of a liquid crystal panel in the first embodiment of the present invention.

5 is an enlarged cross-sectional view showing a cross section of a pixel switching element used in the first embodiment of the present invention.

6 is an enlarged cross-sectional view showing a cross section of the photo sensor element in the first embodiment of the present invention.

7 is a cross-sectional view schematically showing the backlight used in the first embodiment of the present invention.

8 is a perspective view schematically showing a backlight used in the first embodiment of the present invention.

FIG. 9 is a view showing a spectral reflection factor of the infrared reflecting pigment contained in the infrared reflecting layer in the first embodiment of the present invention.

FIG. 10 schematically shows a state when biometric authentication is performed in accordance with light reception data obtained from an object when a finger of a human body is in contact with or moved to a pixel region of a liquid crystal panel as the object in the first embodiment of the present invention. It is a cross section.

FIG. 11 is a side view conceptually showing a form when light emitted from a light source is incident on an infrared reflecting layer in the first embodiment of the present invention.

FIG. 12 is a side view conceptually showing a form when light emitted from a light source enters an infrared reflecting layer in the first embodiment of the present invention.

Fig. 13 is a sectional view schematically showing the backlight in the second embodiment of the present invention.

Fig. 14 is a perspective view schematically showing a backlight in the second embodiment of the present invention.

Fig. 15 is an enlarged perspective view of the diffraction grating portion in the second embodiment of the present invention.

FIG. 16 schematically shows a form of biometric authentication according to light reception data obtained from an object when a finger of a human body as the object is touched or moved in the pixel region of the liquid crystal panel in the second embodiment of the present invention. It is a cross section.

17 is a cross-sectional view showing the configuration of a liquid crystal display according to a third embodiment of the present invention.

18 is a cross-sectional view schematically showing a backlight used in a third embodiment according to the present invention.

19 is a perspective view schematically showing a backlight used in a third embodiment according to the present invention.

20 is a cross-sectional view schematically showing the front light used in the third embodiment of the present invention.

Fig. 21 is a perspective view showing the main part of the front light used in the third embodiment of the present invention.

Fig. 22 is a schematic diagram of a shape when biometric authentication is performed according to light reception data obtained from an object when a finger of a human body is in contact with or moved to a pixel region of a liquid crystal panel as the object in the third embodiment of the present invention. It is sectional drawing shown.

Fig. 23 is a sectional view schematically showing the front light used in the fourth embodiment of the present invention.

Fig. 24 is a perspective view showing the main part of the front light used in the fourth embodiment of the present invention.

Fig. 25 is a view schematically illustrating a form when biometric authentication is performed according to light reception data obtained from an object when a finger of a human body as the object is touched or moved in the pixel region of the liquid crystal panel in the fourth embodiment of the present invention. It is sectional drawing shown.

26 is a cross-sectional view illustrating a configuration of a liquid crystal display according to a fifth embodiment of the present invention.

Fig. 27 is a sectional view schematically showing pixels provided in the pixel region of the liquid crystal panel used in the fifth embodiment of the present invention.

Fig. 28 is a sectional view showing the structure of an EL display device according to a sixth embodiment of the present invention.

29 is a cross-sectional view schematically showing pixels provided in a plurality of pixel areas of an EL panel used in a sixth embodiment of the present invention.

Fig. 30 is a view schematically illustrating a form when biometric authentication is performed in accordance with light receiving data obtained from an object when a finger of a human body as the object is touched or moved in the pixel area of the EL panel in the sixth embodiment of the present invention. It is sectional drawing shown.

31 is a cross-sectional view showing a modification of the configuration of a pixel switching element according to another embodiment of the present invention.

It is a figure which shows the TV set to which the liquid crystal display device of embodiment which concerns on this invention is applied.

It is a figure which shows the digital still camera to which the liquid crystal display device of embodiment which concerns on this invention is applied.

It is a figure which shows the notebook computer to which the liquid crystal display device of embodiment which concerns on this invention is applied.

It is a figure which shows the mobile telephone to which the liquid crystal display device of embodiment which concerns on this invention is applied.

It is a figure which shows the video camera to which the liquid crystal display device of embodiment which concerns on this invention is applied.

Claims (18)

In a display device, The display device, A display panel in which a plurality of pixels are disposed on a surface of the pixel area; And An illumination unit generating illumination light along a normal direction perpendicular to the display panel Including; The lighting unit, A light source for irradiating initial light; And A light guiding board disposed to face the surface of the display panel. Wherein the initial light generated from the light source is incident on a surface of the light guide plate, and the initial light reaching the incident surface is guided to a radiation surface of the light guide plate, and thus the emission surface Is emitted as the illumination light from The display panel, And function as elements each used to receive input light traveling in a direction parallel to a direction from the front of the display panel to the back of the display panel, and to function as a panel configured to display an image on the front side in the pixel area. A plurality of photo sensor elements disposed in the pixel region; The light source is, An invisible light source for generating an invisible light beam as said initial light, The light guide plate, An invisible light reflecting portion configured to reflect the invisible light generated by the invisible light source in a direction parallel to a direction toward the front of the display panel from the back of the display panel, The invisible light reflecting unit is provided at a position corresponding to a region included in the pixel region where the photo sensor element is formed, And the invisible light beam reflected by the invisible light reflecting unit is emitted from the exit surface of the light guide plate as the illumination light. The method of claim 1, The invisible light source generates infrared light as the invisible light. The method of claim 2, Further comprising a biometric authentication unit for authenticating a biological subject positioned on the front side of the display panel, The biological object reflects the illumination light generated by the illumination unit from the front side of the display panel to the back side of the display panel, The photosensor element receives the reflected illumination light as input light and generates light reception data from the reflected illumination light, And the biometric authentication unit authenticates the biometric object according to the light reception data. The method of claim 3, And the photo sensor element generates the light receiving data by receiving the reflected light reflected from the illumination light reflected by blood flowing in the living body object. The method of claim 4, wherein The display panel, A first substrate positioned on the back side; A second substrate facing the first substrate at a distance from the first substrate; And Liquid crystal layer, which functions as a layer having liquid crystal molecules that are located at the gap between the first substrate and the second substrate and are evenly aligned. Including, display device. The method of claim 5, And the illumination unit is disposed on the back side of the display panel. The method of claim 6, The display panel is a transmissive liquid crystal panel, The lighting unit includes a visible light source for generating visible light, The light guide plate guides the visible light emitted to the incident surface by the visible light source and the invisible light emitted to the incident surface by the invisible light source to the emission surface as illumination light, thereby transmitting the liquid crystal of the transmission type. A display device which displays an image in the pixel region of the display panel functioning as a panel. The method of claim 7, wherein The invisible light reflecting unit includes an invisible light reflecting layer containing an invisible light reflecting pigment for reflecting the invisible light. The method of claim 8, The invisible light reflecting unit is a display device in which a plurality of invisible light reflecting layers are formed in a region where the photo sensor element is formed in the pixel region, and the plurality of invisible light reflecting layers are arranged at a distance from each other. The method of claim 7, wherein The invisible light reflecting portion includes a diffraction grating portion diffracting the invisible light ray and a reflecting portion reflecting the invisible light diffracted by the diffraction grating portion. The method of claim 10, The said invisible light reflection part is a display apparatus in which the said diffraction grating part is formed in the area | region in which the said photo sensor element was formed in the said pixel area | region, and the said plurality of diffraction grating parts are arrange | positioned at intervals from each other. The method of claim 5, And the illumination unit is disposed at the front side of the display panel. The method of claim 12, The invisible light reflecting portion is a prism surface that reflects the invisible light generated by the invisible light source in a direction parallel to a direction from the back side of the display panel toward the front side of the display panel. Including, display device. The method of claim 12, The invisible light reflecting unit includes an invisible light reflecting layer containing an invisible light reflecting pigment that reflects the invisible light. The method of claim 14, The invisible light reflecting unit is a display device in which a plurality of invisible light reflecting layers are formed in a region where the photo sensor element is formed in the pixel region, and the plurality of invisible light reflecting layers are arranged at a distance from each other. The method of claim 12, And the display panel is a reflective liquid crystal panel. The method of claim 3, And the display panel is an EL (electroluminescent) panel. In the lighting device, In the illumination device, a plurality of pixels are arranged along a surface in a pixel region, and a plurality of photo sensor elements for generating light receiving data are arranged in the pixel region by receiving light directed from the front to the back, and the image is placed on the front side. It includes an illumination unit for emitting the illumination light in the direction normal to the display panel for displaying a, The lighting unit, A light source for irradiating initial light, A light guide plate disposed to face a surface of the display panel, wherein light generated from the light source is incident from an incident surface, guides light incident from the incident surface, and the guided light is emitted as the illumination light from an exit surface; Including; The light source comprises an invisible light source for generating invisible light rays as the initial light, The light guide plate includes an invisible light reflecting portion that reflects the invisible light generated by the invisible light source in a direction parallel to a direction from the back side of the display panel toward the front side of the display panel, The invisible light reflecting unit is provided to correspond to an area where the photo sensor element is formed in the pixel area, The invisible light beam reflected by the invisible light reflecting unit is emitted from the exit surface as the illumination light.

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