JP2008180929A - Liquid crystal display device and driving method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of reducing power consumption, and to provide a driving method of the liquid crystal display device. <P>SOLUTION: Each pixel includes: a sub-pixel which transmits light of backlight and performs display; and a sub-pixel which reflects light made incident from a display surface and performs display, wherein an inherent display pattern constituting prescribed images, respectively, on each sub-pixel is formed such that a prescribed image is reflectively displayed on a display region and, therefore, prescribed pixels can be displayed even when the pixels are not driven upon the reflective display. Accordingly, the power consumption can be reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device and a driving method of the liquid crystal display device.

  A liquid crystal display device as disclosed in Patent Document 1 is widely used as a display unit of an electronic device such as a mobile phone or a personal computer. For example, when used as a display unit of a mobile phone, various images such as a manufacturer logo and a specific pattern are displayed on a standby screen.

  In recent years, a so-called transflective liquid crystal display device is often mounted as a display unit of a mobile phone, a personal computer, or the like. The transflective liquid crystal display device includes a liquid crystal panel and a backlight. A reflective layer is formed on a part of the pixels provided on the liquid crystal panel, and the other part transmits the light of the backlight. It has become.

For example, when driving such a liquid crystal display device, a driving method is known in which a backlight is turned on to perform transmissive display, and when there is no operation for a certain period of time, the backlight is turned off to perform reflective display. This driving method has an advantage that the power consumption of the liquid crystal display device can be suppressed.
Japanese Patent Laid-Open No. 11-101992

  However, in the conventional liquid crystal display device as shown in Patent Document 1 or the like, when displaying an image for a long time such as a standby screen, it is necessary to continue driving a specific pixel for a long time, so that power consumption is increased accordingly. turn into.

  In view of the circumstances as described above, an object of the present invention is to provide a liquid crystal display device capable of reducing power consumption and a method for driving the liquid crystal display device.

In order to achieve the above object, a liquid crystal display device according to the present invention has a display region in which a pair of substrates are arranged so as to sandwich a liquid crystal layer, and a plurality of pixels are arranged in a matrix in a plan view. And a liquid crystal panel having one surface serving as a display surface for displaying an image, and a lighting device provided on the opposite side of the display surface of the liquid crystal panel and irradiating the liquid crystal panel with light. A first sub-pixel in which each pixel transmits and displays the light of the illumination device; and a second sub-pixel that reflects and displays light incident from the display surface of the liquid crystal panel. And a unique display pattern constituting the predetermined image is formed in each of the second sub-pixels so that the predetermined image is reflected and displayed in the display area.
According to the present invention, the pixels arranged in a matrix on the liquid crystal panel reflect and display the first sub-pixel that transmits and displays the light of the illumination device and the light incident from the display surface of the liquid crystal panel. Each of the second sub-pixels has a unique display pattern that forms a predetermined image so that the predetermined image is reflected and displayed in the display area. In the case of performing reflective display, a predetermined pixel can be displayed in the display area without driving the pixel. Thereby, power consumption can be reduced.

The liquid crystal display device is characterized in that the light transmittance of the liquid crystal layer can be independently controlled by the first subpixel and the second subpixel.
According to the present invention, since the light transmittance of the liquid crystal layer can be controlled independently for the first sub-pixel and the second sub-pixel, transmissive display by the first sub-pixel and reflection by the second sub-pixel are possible. The display and the display can be driven separately. As a result, various displays such as a transmissive display mode using the first sub-pixel, a reflective display mode using the second sub-pixel, and a combined mode of transmissive display and reflective display using the first and second sub-pixels are possible.

The liquid crystal display device is characterized in that a control unit for controlling light transmittance of the liquid crystal layer is provided so that the second sub-pixel displays black when the lighting device is lit. To do.
According to the present invention, since the control unit for controlling the light transmittance of the liquid crystal layer is provided so that the second sub-pixel displays black when the lighting device is turned on, the lighting device is turned on. In the transmissive display, the second sub-pixel can be displayed in black. As a result, it is possible to prevent the predetermined image by the second subpixel and the image by the transmissive display from being mixed, so that high display characteristics can be obtained.

In the above liquid crystal display device, one of the pair of substrates is provided with a color filter layer made of a predetermined material in a region overlapping the first subpixel in plan view, and the second subpixel. A display pattern layer made of the predetermined material is provided in a region overlapping in plan view, and the other substrate of the pair of substrates has a light reflection layer in a region overlapping in plan view with the second sub-pixel. It is provided.
According to the present invention, one of the pair of substrates is provided with a color filter layer made of a predetermined material in a region overlapping the first subpixel in plan view, and the second subpixel in plan view. A display pattern layer made of the same material as the color filter layer is provided in the overlapping region, and the other substrate of the pair of substrates is provided with a light reflecting layer in the region overlapping the second subpixel in plan view. Therefore, the color filter layer and the display pattern layer can be formed in one step when the one substrate is formed. Thereby, the manufacturing process can be shortened and the manufacturing cost can be suppressed, so that an inexpensive liquid crystal display device can be obtained.

The liquid crystal display device is characterized in that the light transmittance of the liquid crystal layer is regulated so that each pixel displays white when not driven.
According to the present invention, since the light transmittance of the liquid crystal layer is regulated so that each pixel displays white when not driven, the so-called normally white mode is set. Also, a predetermined image by the second sub-pixel can be displayed in the display area. Thus, various displays are possible by the present invention.

In the liquid crystal display device driving method according to the present invention, a pair of substrates are arranged so as to sandwich a liquid crystal layer, and a plurality of pixels are arranged in a matrix in plan view. A liquid crystal panel whose surface is a display surface for displaying an image, and an illumination device that is provided on the opposite side of the display surface of the liquid crystal panel and that irradiates light to the liquid crystal panel, A first sub-pixel that transmits and displays the light of the illumination device; and a second sub-pixel that reflects and displays the light incident from the display surface of the liquid crystal panel. When driving a liquid crystal display device in which a unique display pattern constituting the predetermined image is formed on each of the second sub-pixels so that the image is reflected and displayed, the first of the liquid crystal layers. The light transmittance of the sub-pixel and the second Characterized by independently controlling the light transmittance of the blanking pixel.
According to the present invention, a pair of substrates are arranged so as to sandwich a liquid crystal layer, a plurality of pixels have a display area arranged in a matrix in plan view, and one surface displays an image. A liquid crystal panel serving as a display surface and an illumination device that is provided on the opposite side of the display surface of the liquid crystal panel and that irradiates light to the liquid crystal panel, and each pixel transmits and displays the light of the illumination device Each of the second sub-pixels includes a first sub-pixel and a second sub-pixel that reflects and displays light incident from the display surface of the liquid crystal panel. When driving a liquid crystal display device in which a specific display pattern constituting a predetermined image is formed in each subpixel, the light transmittance of the first subpixel and the light transmittance of the second subpixel in the liquid crystal layer Are controlled independently, so that the first sub-pixel Transmissive display and a reflective display by the second sub-pixel can be driven separately by. As a result, various displays such as a transmissive display mode using the first sub-pixel, a reflective display mode using the second sub-pixel, and a combined mode of transmissive display and reflective display using the first and second sub-pixels are possible.

In the driving method of the liquid crystal display device, the signal for controlling the light transmittance of the first sub-pixel and the signal for controlling the light transmittance of the second sub-pixel in the liquid crystal layer are the same signal. It is characterized by being.
According to the present invention, the signal for controlling the light transmittance of the first sub-pixel and the signal for controlling the light transmittance of the second sub-pixel in the liquid crystal layer are the same signal. The circuit can be simplified, and power consumption can be reduced accordingly.

The driving method of the liquid crystal display device is characterized in that the light transmittance of the liquid crystal layer is controlled so that the second sub-pixel takes two display states of white display and black display.
According to the present invention, since the second sub-pixel performs so-called binary driving that controls the light transmittance of the liquid crystal layer so that both the white display and the black display are taken. Can be simplified, and power consumption can be reduced accordingly.

Embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale is appropriately changed to make each member a recognizable size.
[First Embodiment]
A first embodiment of the present invention will be described with reference to the drawings. In the following drawings, the scale is appropriately changed to make each member a recognizable size.

FIG. 1 is a diagram showing an overall configuration of the liquid crystal display device 1. In this embodiment, an active matrix transflective liquid crystal display device using a thin film transistor (hereinafter referred to as TFT) element as a switching element will be described as an example.
As shown in FIG. 1, the liquid crystal display device 1 is mainly composed of a liquid crystal panel 2, a backlight 3, and a flexible substrate F. The liquid crystal panel 2 and the backlight 3 are arranged so as to overlap in plan view, and only the liquid crystal panel 2 is shown in FIG. A power supply circuit or the like is formed on the flexible substrate F.

  In the liquid crystal panel 2, a TFT array substrate (first substrate) 4 and a color filter substrate (second substrate) 5 are bonded together by a sealing material 7, and a liquid crystal layer 6 is formed in a region partitioned by the sealing material 7. It has an enclosed configuration. An injection port 7 a for injecting liquid crystal is provided in a part of the sealing material 7. The injection port 7a is sealed with a sealing material 7b. A light shielding film (peripheral parting) 8 made of a light shielding material is provided in a region inside the sealing material 7. An area inside the peripheral parting 8 is a display area 9 for displaying an image, a moving image, or the like. A plurality of sub-pixels 10 are provided in a matrix in the display area 9. In the present embodiment, four sub-pixels 10 adjacent in the left-right direction in the figure constitute one set to constitute one pixel. A region between the sub-pixels 10 is an inter-pixel region 11.

  The peripheral edge portion of the TFT array substrate 4 is an overhanging region protruding from the color filter substrate 5. A scanning line driving circuit 12 for generating a scanning signal is formed on the left side and the right side in the drawing in the overhang region. On the upper side in the figure, a wiring 14 for connecting the left and right scanning line driving circuits 12 is routed. On the lower side in the figure, a data line driving circuit 13 for generating a data signal and a connection terminal 15 for connecting to a power supply circuit or the like formed on the flexible substrate F are formed. The scanning line driving circuit 12 and the data line driving circuit 13 supply two types of voltage signals so that each sub-pixel 10 performs two types of display, white display and black display. These two types of voltage signals are the same in all the sub-pixels 10. In a region between the scanning line driving circuit 12 and the connection terminal 15, a wiring 16 that connects them is formed. At each corner of the color filter substrate 5, an inter-substrate conductive material 17 for electrical connection between the TFT array substrate 4 and the color filter substrate 5 is provided.

FIG. 2 is a diagram illustrating a configuration along the AA cross section of FIG. 1.
The TFT array substrate 4 includes, for example, a base material 4a formed from a material having high translucency such as glass and quartz, a pixel electrode 48 formed on the liquid crystal side of the base material 4a, and an electric signal to the pixel electrode 48. A switching element 47 for supplying the light, a light reflection layer 45, a pixel electrode 48, an alignment film 46 formed so as to cover the switching element 47 and the light reflection layer 45, and the outside of the substrate 4a (the liquid crystal layer 6 is The polarizing plate 49 affixed to the opposite side) is the main component.

  The pixel electrode 48 is disposed in a region overlapping the subpixel 10 in plan view, and is formed of a transparent conductive material such as ITO (Indium Tin Oxide). The switching element 47 is disposed in the inter-pixel region 11 and is provided so as to correspond to the pixel electrode 48 on a one-to-one basis. As described above, the orientation of the liquid crystal layer 6 can be regulated independently for each sub-pixel 10. The switching element 47 is an element made of a thin film transistor, for example, and is connected to a scanning line and a data line (not shown). The alignment film 46 is provided at the interface with the liquid crystal layer 6 and regulates the alignment of liquid crystal molecules constituting the liquid crystal layer 6.

  The light reflecting layer 45 is a metal layer made of, for example, aluminum, and reflects light toward the color filter substrate 5 side. The light reflecting layer 45 is provided on, for example, the rightmost sub-pixel 10b among four adjacent sub-pixels constituting one pixel. The light reflection layer 45 is provided in a region occupying almost the entire surface of the sub-pixel 10b in plan view on the liquid crystal layer 6 side of the pixel electrode 48, and this region is a light reflection region. The surface of the light reflecting layer 45 (the surface on the liquid crystal layer 6 side) is a reflecting surface. The thickness of each light reflecting layer 45 is constant. The sub-pixel 10 a on which the light reflection layer 45 is not provided is a transmissive display sub-pixel (first sub-pixel) that transmits light from the backlight 3. The sub-pixel 10b provided with the light reflection layer 45 is a sub-pixel for reflection display (second sub-pixel) that reflects and displays light from the color filter substrate 5 side.

On the other hand, the color filter substrate 5 is mainly composed of the base material 5 a, the color filter layer 50, the pattern layer 60, the light shielding film 51, the common electrode 58, and the alignment film 56.
The base material 5a is a rectangular plate-like member formed from a highly light-transmitting material such as glass or quartz, as with the base material 4a. The color filter layer 50 is a color layer provided on the liquid crystal layer 6 side of the substrate 5a so as to overlap the subpixel 10 in plan view. The color filter layer 50 includes three color layers including a red layer 50R, a green layer 50G, and a blue layer 50B made of a known material such as an organic material or an inorganic material.

  Of the four sub-pixels 10 constituting one pixel, the sub-pixel 10a in which the above-described light reflection layer 45 is not provided is provided with a red, green, and blue color filter layer 50 for each color. For example, the red layer 50R, the green layer 50G, and the blue layer 50B are arranged in adjacent rows. A pattern layer 60 is disposed in the sub-pixel 10b provided with the light reflection layer 45 described above. The pattern layer 60 is formed in the same layer as the color filter layer 50.

  The light shielding film 51 is a light shielding member made of a material capable of reflecting or absorbing light, and is provided around the color filter layer 50. The common electrode 58 is an electrode formed of a transparent conductive material such as ITO, and is provided so as to cover the color filter layer 50 and the light shielding film 51. A transparent layer 58a having a predetermined thickness is provided in a region of the lower layer (upper side in the drawing) of the common electrode 58 that overlaps the light reflecting layer 45 in plan view. Due to the transparent layer 58a, a region of the common electrode 58 that overlaps the light reflection layer 45 in a plan view protrudes toward the liquid crystal layer 6 as compared with other regions. As a result, the gap t2 of the liquid crystal layer 6 in the region where the light reflecting layer 45 is provided is smaller than the gap t1 of the liquid crystal layer 6 in other regions. The alignment film 56 is provided at the interface with the liquid crystal layer 6, and regulates the alignment of liquid crystal molecules constituting the liquid crystal layer 6 with the alignment film 46.

  The liquid crystal layer 6 is made of liquid crystal molecules such as a fluorine-based liquid crystal compound and a non-fluorine-based liquid crystal compound, and is in contact with both the alignment film 46 on the TFT array substrate 4 side and the alignment film 56 on the color filter substrate 5 side. So as to be sandwiched between both substrates. The alignment of the liquid crystal molecules is regulated by the alignment film 46 and the alignment film 56 (normally white mode) so as to transmit light when not applied with no voltage.

In the liquid crystal display device 1 configured as described above, the configuration of the sub-pixel 10b provided with the light reflection layer 45 will be described more specifically.
FIG. 3 is a plan view showing the arrangement of the sub-pixels 10 provided in the display area 9. A portion surrounded by a broken line in the figure indicates one pixel.

  As shown in the figure, red, green, blue and white display patterns are formed in the pattern layer 60 in the sub-pixel 10b. Of the display pattern, the red portion 60R, the green portion 60G, and the blue portion 60B are formed of the same material as the red layer 50R, the green layer 50G, and the blue layer 50B of the color filter layer 50, respectively. Of the color pattern, the white portion 60W is a portion where the color layers are not formed. This display pattern has a unique pattern for each sub-pixel 10b. In the display region 9 of the liquid crystal display device 1 shown in FIG. Each of the sub-pixels 10b has a unique display pattern so as to constitute a part of such a predetermined image.

Next, a driving method of the liquid crystal display device 1 configured as described above will be described.
In this liquid crystal display device 1, the sub-pixel 10 b can be driven by binary values of white display (light is transmitted through the liquid crystal layer 6) and black display (light is not transmitted through the liquid crystal layer 6). It is.

  First, a state where the power source of the liquid crystal display device 1 is turned off will be described. The liquid crystal layer 6 of the liquid crystal display device 1 is a so-called normally white mode that transmits light when the power is off. Since the backlight 3 is turned off in the power-off state, no display is performed on the transmissive display sub-pixel 10a.

  On the other hand, in the sub-pixel 10 b for reflection display, light from the outside of the liquid crystal panel 2 passes through the liquid crystal layer 6. This transmitted light is reflected by the light reflecting layer 45 and is emitted to the outside of the liquid crystal panel 2. In this process, since light passes through the pattern layer 60 provided on the color filter substrate 5, the display pattern formed in each pattern layer 60 is displayed on the sub-pixel 10b. Therefore, in this state, the predetermined image I shown in FIG. 4 is reflected and displayed.

Next, a state where the power source of the liquid crystal display device 1 is turned on will be described. In a state in which the power source of the liquid crystal display device 1 is turned on, the light transmittance of the liquid crystal layer 6 can be independently driven by the sub-pixel 10a and the sub-pixel 10b.
When the backlight 3 is turned off, the sub-pixel 10a does not transmit light, as shown in FIG. For the sub-pixel 10b, the liquid crystal layer 6 can be driven so as to transmit light, or the liquid crystal layer 6 can be driven so as not to transmit light. When light is transmitted, the display pattern formed in each pattern layer 60 is displayed as in the case of power-off. When light is not transmitted, both the sub-pixel 10a and the sub-pixel 10b display black as shown in FIG. Based on this, for example, the liquid crystal layer 6 may be controlled to form an image using black display. As shown in FIG. 6, by displaying some of the sub-pixels 10b in black, it is also possible to display a black image superimposed on a predetermined image I.

  Further, in a state where the backlight 3 is lit, the sub-pixel 10a and the sub-pixel 10b can be driven to transmit or not transmit light. For example, as shown in FIG. 7, when driving is performed so that light is transmitted through the sub-pixel 10a and light is not transmitted through the sub-pixel 10b, an image K is displayed only by the sub-pixel 10a as shown in FIG. . With this driving, the predetermined image I is not displayed.

  Thus, according to the present embodiment, each pixel has the sub-pixel 10a that transmits and displays the light of the backlight 3, and the sub-pixel 10b that reflects and displays the light incident from the display surface. When each of the sub-pixels 10b has a unique display pattern constituting the predetermined image I so that the predetermined image I is reflected and displayed in the display area 9, the reflective display is performed. Can display a predetermined image I without driving the pixel. Thereby, power consumption can be reduced.

  In the present embodiment, since the light transmittance of the liquid crystal layer 6 can be controlled independently by the sub-pixel 10a and the sub-pixel 10b, the transmissive display by the sub-pixel 10a and the reflective display by the sub-pixel 10b can be performed. Can be driven separately. As a result, various displays such as the transmissive display mode by the sub-pixel 10a, the reflective display mode by the sub-pixel 10b, and the combined mode of transmissive display and reflective display by the sub-pixel 10a and the sub-pixel 10b are possible as described above.

  In the present embodiment, the control unit (scanning line driving circuit 12, data line driving circuit) controls the light transmittance of the liquid crystal layer 6 so that the sub-pixel 10b displays black when the backlight 3 is lit. 13), it is possible to display the sub-pixel 10b so as to display black during transmissive display in which the backlight 3 is lit. Thereby, it is possible to prevent the predetermined image I by the sub-pixel 10b and the image by the transmissive display from being mixed, so that high display characteristics can be realized.

  In the present embodiment, a color filter layer 50 made of a predetermined material is provided in a region overlapping the sub pixel 10a in plan view, and the same material as the color filter layer 50 is provided in a region overlapping the sub pixel 10b in plan view. Therefore, for example, when the color filter substrate 5 is formed, the color filter layer 50 and the display pattern layer 60 can be formed in one step. As a result, the manufacturing process can be shortened and the manufacturing cost can be reduced, so that the inexpensive liquid crystal display device 1 can be obtained.

  In the present embodiment, the liquid crystal display device is in a so-called normally white mode in which the light transmittance of the liquid crystal layer 6 is regulated so that each sub-pixel 10 displays white when not driven. Even when the power of 1 is turned off, the predetermined image I can be displayed by the sub-pixel 10b. As a result, various displays are possible.

  In the present embodiment, the signal for controlling the light transmittance of the sub-pixel 10a in the liquid crystal layer 6 and the signal for controlling the light transmittance of the sub-pixel 10b can be the same signal. That is, the sub-pixel 10b can be driven by the same signal as the signal for controlling any one of the red layer 50R, the green layer 50G, and the blue layer 50B. In this way, the circuit for driving the sub-pixel 10b can be simplified, and the power consumption can be reduced accordingly. At this time, the subpixel 10b may be driven by the same signal as the subpixel 10a of the green layer 50G. This is because the green layer 50G has higher visual sensitivity than the other red layers 50R and blue layers 50B, and therefore the sub-pixel 10a has the least influence on the visual perception given to the observer by driving the sub-pixel 10b.

In the present embodiment, since the sub-pixel 10b is so-called binary driving that controls the light transmittance of the liquid crystal layer 6 so as to take two types of display states of white display and black display. Can be simplified, and power consumption can be reduced accordingly.
In this embodiment, one of the pair of substrates is the color filter substrate 5, but the color filter layer 50 may be formed on the TFT array substrate 4. For example, the color filter layer 50 is formed on the light reflecting layer 45 or the pixel electrode 48.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the present embodiment, an example of a mobile phone will be described as an electronic apparatus including the liquid crystal display device 1 described in the first embodiment.
FIG. 9 is a front view showing the overall configuration of the mobile phone 300.
The cellular phone 300 is mainly composed of a frame 301 with a pattern formed thereon, an operation unit 302 provided with a plurality of operation buttons, and a display unit 303 that displays images, moving images, characters, and the like. The liquid crystal display device 1 according to the above embodiment is mounted on the display unit 303.

  When the power of the liquid crystal display device 1 is turned off or when the backlight 3 is turned off when the power is turned on, a predetermined image I is displayed in the display area of the liquid crystal display device 1. In the present embodiment, the predetermined image I and the pattern of the casing 301 of the mobile phone 300 are integrated.

  According to this embodiment, since the liquid crystal display device 1 capable of reducing power consumption is mounted, the mobile phone 300 that can be used for a long time can be obtained. In addition, since the liquid crystal display device 1 capable of various displays such as combining the pattern formed on the housing 301 and the image displayed on the display unit 303 into an integrated design is mounted, the design property Can be obtained.

  Note that the liquid crystal display device of the present invention is not limited to the above mobile phone, but includes, for example, electronic books, personal computers, digital still cameras, liquid crystal televisions, viewfinder type or monitor direct view type video tape recorders, car navigation devices, pagers. It may also be used as a display unit for electronic devices such as electronic notebooks, calculators, word processors, workstations, videophones, and POS terminals.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, it has been described that the light reflectance of the light reflection layer that totally reflects light is constant. However, the present invention is not limited to this. For example, the light reflectance is different for each sub-pixel 10. You can design. As a result, the brightness and contrast of the display light can be made different between the sub-pixels 10, and the range of expression is further expanded.

  In the above embodiment, the thickness of the light reflection layer that totally reflects the light is described as being constant. However, the thickness is not limited to this, and for example, the subpixel 10 is designed to have a different thickness. It doesn't matter. Thereby, it is possible to make a difference in cell gap between the sub-pixels 10. By making a difference in the cell gap, it is possible to make a difference in the brightness and contrast of the display light, thereby further widening the range of expression.

  Moreover, in the said embodiment, although orientation was controlled so that the whole area | region of a liquid-crystal layer might be what is called a normally white mode, it is not restricted to this. For example, the orientation of the liquid crystal layer may be partially restricted so that only the region of the sub-pixel 10b that performs total reflection by the light reflection layer 45 is in the normally white mode.

1 is a plan view showing a configuration of a liquid crystal display device according to a first embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating a configuration of a liquid crystal display device according to the embodiment. FIG. 3 is a plan view showing a configuration of a part of the liquid crystal display device according to the embodiment. FIG. 2 is a plan view showing a configuration of a liquid crystal display device according to the present embodiment. FIG. 3 is a plan view showing a configuration of a part of the liquid crystal display device according to the embodiment. FIG. 3 is a plan view showing a configuration of a part of the liquid crystal display device according to the embodiment. FIG. 3 is a plan view showing a configuration of a part of the liquid crystal display device according to the embodiment. FIG. 3 is a plan view showing a configuration of a part of the liquid crystal display device according to the embodiment. The top view which shows the structure of the mobile telephone which concerns on 2nd Embodiment of this invention.

Explanation of symbols

  I ... Image J ... Image K ... Image 1 ... Liquid crystal display device 2 ... Liquid crystal panel 3 ... Backlight 4 ... TFT array substrate 5 ... Color filter substrate 6 ... Liquid crystal layer 9 ... Display region 10 ... Subpixel 10a ... Subpixel 10b ... Sub-pixel 12 ... Scanning line drive circuit 13 ... Data line drive circuit 45 ... Light reflection layer 47 ... Switching element 48 ... Pixel electrode 50 ... Color filter layer 60 ... Display pattern layer 60R ... Red part 60G ... Green part 60B ... Blue part 60W ... white part 300 ... mobile phone 301 ... housing 303 ... display unit

Claims (8)

A pair of substrates are arranged so as to sandwich the liquid crystal layer, and a plurality of pixels have a display area arranged in a matrix in plan view, and one surface is a display surface for displaying an image. LCD panel,
A liquid crystal display device comprising: an illuminating device that is provided on the opposite surface side of the display surface of the liquid crystal panel and irradiates the liquid crystal panel with light;
Each of the pixels has a first sub-pixel that transmits and displays the light of the illumination device, and a second sub-pixel that reflects and displays the light incident from the display surface of the liquid crystal panel,
A liquid crystal display device, wherein a specific display pattern constituting the predetermined image is formed in each of the second sub-pixels so that the predetermined image is reflected and displayed in the display area. 2. The liquid crystal display device according to claim 1, wherein the light transmittance of the liquid crystal layer can be independently controlled by the first sub-pixel and the second sub-pixel. The control unit for controlling the light transmittance of the liquid crystal layer is provided so that the second sub-pixel performs black display when the lighting device is turned on. Liquid crystal display device. One substrate of the pair of substrates is provided with a color filter layer made of a predetermined material in a region overlapping the first sub-pixel in plan view, and in a region overlapping the second sub-pixel in plan view. A display pattern layer made of the predetermined material is provided;
The light reflection layer is provided in the area | region which overlaps with the said 2nd sub pixel by planar view in the other board | substrate among a pair of said board | substrates. A liquid crystal display device according to 1. The liquid crystal display according to any one of claims 1 to 4, wherein the light transmittance of the liquid crystal layer is regulated so that the respective pixels display white when not driven. apparatus. A pair of substrates are arranged so as to sandwich the liquid crystal layer, and a plurality of pixels have a display area arranged in a matrix in plan view, and one surface is a display surface for displaying an image. LCD panel,
An illuminating device that is provided on the opposite side of the display surface of the liquid crystal panel and irradiates the liquid crystal panel with light;
Each of the pixels has a first sub-pixel that transmits and displays the light of the illumination device, and a second sub-pixel that reflects and displays the light incident from the display surface of the liquid crystal panel,
When driving a liquid crystal display device in which a unique display pattern constituting the predetermined image is formed in each of the second sub-pixels so that the predetermined image is reflected and displayed in the display area.
A driving method of a liquid crystal display device, wherein the light transmittance of the first sub-pixel and the light transmittance of the second sub-pixel of the liquid crystal layer are controlled independently. The signal for controlling the light transmittance of the first sub-pixel in the liquid crystal layer and the signal for controlling the light transmittance of the second sub-pixel are the same signal. A driving method of the liquid crystal display device described. 8. The liquid crystal display device according to claim 6, wherein the light transmittance of the liquid crystal layer is controlled so that the second sub-pixel has two display states of white display and black display. Driving method.

Images