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WO2019033352A1 - Module d'affichage et dispositif électronique - Google Patents

Module d'affichage et dispositif électronique Download PDF

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Publication number
WO2019033352A1
WO2019033352A1 PCT/CN2017/097912 CN2017097912W WO2019033352A1 WO 2019033352 A1 WO2019033352 A1 WO 2019033352A1 CN 2017097912 W CN2017097912 W CN 2017097912W WO 2019033352 A1 WO2019033352 A1 WO 2019033352A1
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WO
WIPO (PCT)
Prior art keywords
display
photosensitive
panel
display module
sensing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/097912
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English (en)
Chinese (zh)
Inventor
李问杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Sunwave Technology Co Ltd
Original Assignee
Shenzhen Sunwave Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Sunwave Technology Co Ltd filed Critical Shenzhen Sunwave Technology Co Ltd
Priority to PCT/CN2017/097912 priority Critical patent/WO2019033352A1/fr
Priority to CN201790000158.6U priority patent/CN209708601U/zh
Publication of WO2019033352A1 publication Critical patent/WO2019033352A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the utility model relates to a display module and an electronic device for realizing biometric information sensing.
  • the optical fingerprint recognition module includes an optical fingerprint sensor 400 and a light source 402.
  • the optical fingerprint sensor 400 is disposed under the protective cover 401 of the mobile terminal.
  • the light source 402 is disposed adjacent to one side of the optical fingerprint sensor 400.
  • the light signal emitted by the light source 402 passes through the protective cover 401 and reaches the finger F, is reflected by the valleys and ridges of the finger F, and is received by the optical fingerprint sensor 400, and A fingerprint image of the finger F is formed.
  • the above optical fingerprint recognition module can only be limited to a predetermined area of the mobile terminal, such as a non-display area of the mobile terminal, and must contact the predetermined area to perform fingerprint recognition, and the use is still limited. Therefore, it is necessary to propose a structure that can be set in the display area and realize fingerprint recognition of any area in the display area.
  • the embodiments of the present invention aim to at least solve one of the technical problems existing in the prior art. To this end, the embodiments of the present invention need to provide a display module and an electronic device.
  • the display device includes a display panel for performing image display, and the display panel includes a plurality of display pixels;
  • the photosensitive device includes a photosensitive panel, and the photosensitive panel is stacked with the display panel for acquiring predetermined biometric information of a target object touching or approaching the display module by sensing the optical signal;
  • the display device further includes a display driving circuit for driving the display pixels to be time-divisionally lit when the photosensitive panel performs biometric information sensing.
  • the photosensitive device can be separately fabricated and assembled with the display device, thereby speeding up the process of the display module.
  • the display display pixels are time-divisionally illuminated, thereby avoiding aliasing of the optical signals sensed by the photosensitive panel, thereby improving the sensing accuracy of the photosensitive device.
  • the photosensitive panel includes a plurality of photosensitive devices for receiving optical signals and converting the received optical signals into corresponding electrical signals.
  • the photosensitive panel is located above the display panel, and the photosensitive panel has a first light transmissive region through which an optical signal of the display pixel passes.
  • the photosensitive panel since the photosensitive panel is located above the display panel, when the electronic device performs biometric information sensing, the optical signal emitted by the display panel passes through the photosensitive panel and reaches the target object, is reflected by the target object, and is reflected back. The light signal is sensed by the photosensitive panel to generate a corresponding light sensitive signal from which biometric information of the target object will be formed.
  • the photosensitive panel not only utilizes the optical signal emitted by the display panel to perform biometric information sensing, but does not need to additionally set the light source, thereby saving cost; and the structure of the display panel is not limited, such as a liquid crystal display panel, an OLED display panel, etc. As long as it can emit light signals when working.
  • the photosensitive device is located above the interval.
  • the photosensitive panel further includes a plurality of switching devices for receiving a scan driving signal and applying a reference signal to the photosensitive device according to the scan driving signal being turned on. To drive the photosensitive device to work.
  • the photosensitive device includes an upper electrode, a lower electrode, and a semiconductor layer between the upper electrode and the lower electrode, and the semiconductor layer and the upper electrode extend above the switching device.
  • the photosensitive area of the photosensitive device can be increased in a limited area, thereby enhancing the sensing effect of the photosensitive panel.
  • the photosensitive device is located above the display pixel.
  • the photosensitive device By using the light transmissive property of the photosensitive device, it is disposed above the display pixel, which not only does not affect the light signal of the display pixel, but also increases the photosensitive area of the photosensitive device, thereby enhancing the sensing effect of the photosensitive panel.
  • the photosensitive panel further includes a transparent substrate, and the photosensitive device is disposed on the transparent substrate.
  • the photosensitive panel is located below the display panel, and the display panel has a second light transmissive region through which an optical signal passes.
  • the photosensitive panel is located below the display panel, and the optical signal emitted by the display panel reaches the target object, and is reflected by the target object, and the reflected optical signal passes through the display pixel and is sensed by the photosensitive device, and correspondingly generated.
  • the photosensitive signal whereby the biometric information of the target object will be formed based on the photosensitive signal.
  • the design of the photosensitive device can more satisfy the photosensitive performance, thereby enhancing the sensing effect of the photosensitive panel.
  • the display panel is an OLED display.
  • the photosensitive device is located below the light transmissive area of the display panel.
  • the second light transmissive region is formed between adjacent display pixels.
  • the display pixels form the second light transmissive region.
  • the photosensitive panel when the photosensitive panel performs biometric information sensing, if a photosensitive device is driven and performs light sensing, the display pixels facing the photosensitive device are not illuminated.
  • the photosensitive device is further provided with a filter film.
  • the filter film By setting the filter film to filter the optical signal outside the preset band, the interference caused by the interference signal to the optical signal reflected by the target object is eliminated, thereby improving the sensing accuracy of the photosensitive device.
  • the display panel has a display area; the photosensitive panel is configured to perform biometric information sensing on a target object at any position within a display area of the display panel; or the photosensitive panel has sensing a region, and a shape of the sensing region is consistent with a shape of the display region, and a size of the sensing region is greater than or equal to a size of the display region.
  • the present embodiment provides an electronic device including the display module of any of the above embodiments.
  • the electronic device has all the technical effects achieved by the above display module.
  • the electronic device further includes a protective cover for being touched by a target object when the electronic device performs biometric information sensing.
  • the electronic device further includes a touch sensor, the touch sensor is configured to determine a touch area of the target object when the target object contacts the protective cover, so that the electronic device is in the Biometric information sensing is performed within the touch area.
  • the touch area is determined by the touch sensor, so that the electronic device performs biometric information sensing in the touch area, thereby preventing biometric information sensing from being performed in the entire display area of the electronic device, thereby accelerating the biometric information sensing of the electronic device, It also reduces the operating power consumption of electronic devices.
  • the touch sensor is either integrated with the protective cover or integrated with a photosensitive panel in the display module or integrated with a display panel in the display module.
  • the touch sensor is integrated with the protective cover or the photosensitive panel or the display panel, thereby reducing the thickness of the electronic device and facilitating the electronic device. Light and thin development.
  • FIG. 1 is a schematic diagram of an optical biometric information sensing structure applied to an electronic device in the prior art
  • FIG. 2 is a partial structural schematic view of a display module according to an embodiment of the present invention.
  • FIG. 3 is a block diagram showing the structure of a photosensitive device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural view of a photosensitive unit according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural view of a photosensitive unit according to another embodiment of the present invention.
  • FIG. 6 is a schematic view showing a corresponding position of the display panel and the photosensitive panel shown in FIG. 2;
  • FIG. 7 is a partial structural schematic view of a photosensitive device according to another embodiment of the present invention.
  • FIG. 8 is a schematic view showing a corresponding position of a display panel and a photosensitive panel according to another embodiment of the present invention.
  • FIG. 9 is a partial structural schematic view of a display module according to another embodiment of the present invention.
  • FIG. 10 is a partial structural schematic view of a display panel according to an embodiment of the present invention.
  • FIG. 11 is a schematic view showing a corresponding position of a display pixel in a display panel and a photosensitive device in a photosensitive panel according to an embodiment of the present invention
  • FIG. 12 is a schematic view showing a corresponding position of a display pixel in a display panel and a photosensitive device in a photosensitive panel according to another embodiment of the present invention.
  • FIG. 13 is a schematic flow chart of biometric information sensing of a display module according to an embodiment of the present invention.
  • FIG. 14 is a schematic flow chart of biometric information sensing of a display module according to another embodiment of the present invention.
  • Figure 15 is a schematic view showing the corresponding position of the display panel and the photosensitive panel shown in Figure 9;
  • 16 is a schematic diagram of a front view of a display module applied to an electronic device according to an embodiment of the present invention.
  • FIG. 17 is a cross-sectional structural view of the electronic device of FIG. 16 taken along line I-I, in which only a partial structure of the electronic device is shown;
  • FIG. 18 is a schematic diagram showing a correspondence relationship between a display area and a sensing area of the photosensitive panel in the display panel according to an embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. .
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of "a plurality” is two or more unless specifically and specifically defined otherwise.
  • Contact or “touch” includes direct or indirect contact.
  • the photosensitive panel disclosed hereinafter is disposed inside the electronic device, such as under the protective cover, and the user's finger indirectly contacts the photosensitive panel through the protective cover.
  • connection is to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship.
  • installation is to be understood broadly, and may be, for example, a fixed connection or a Disassembling the connection, or connecting integrally; may be mechanical connection, electrical connection or communication with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or mutual interaction of two elements Role relationship.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the embodiment of the present invention provides a display module for realizing biometric information sensing.
  • the display module can realize image display, and can also acquire biometric information of a target object contacting or approaching the display module.
  • FIG. 2 illustrates the structure of a display module according to an embodiment of the present invention.
  • the display module 1 includes a display device (not shown) and a photosensitive device 20 (please refer to FIG. 3).
  • the display device in turn includes a display panel 100 for performing image display.
  • the photosensitive device 20 includes a photosensitive panel 200, and the photosensitive panel 200 is stacked with the display panel 100 for sensing an optical signal to acquire predetermined biometric information of a target object touching or approaching the display module 1.
  • the display panel 100 includes a plurality of display pixels 12 with an interval H between adjacent display pixels 12. Further, the display panel 100 further includes a driving circuit (not shown) that drives the display pixels 12 to emit light. The corresponding driving circuit may be disposed between the display pixels 12, or may be disposed under each of the display pixels 12. .
  • the display device further includes a display driving circuit (not shown) for driving the plurality of display pixels 12 to emit light to serve as a light source when the photosensitive device 20 performs light sensing. Further, the display driving circuit drives the display pixels 12 to lightly illuminate when the photosensitive device 20 performs light sensing.
  • the display driving circuit may be disposed on the display panel 100 or may be connected to the display pixel 12 through a connector (eg, a flexible circuit board).
  • the photosensitive panel 200 includes a substrate 26 and a plurality of photosensitive devices 220 formed on the substrate 26.
  • the photosensitive device 220 is configured to receive an optical signal and convert the received optical signal into a corresponding electrical signal.
  • the substrate 26 can include both a transparent substrate such as, but not limited to, an insulating substrate such as a glass substrate, a plastic substrate, a crystal, and the like, and a non-transparent substrate such as, but not limited to, a silicon substrate, a printed circuit board, a metal substrate, and the like.
  • the substrate 26 may be a rigid material or a flexible material such as a flexible film. If the substrate 26 is a flexible material, the photosensitive panel 200 is not only thinner in thickness, but also applicable to an electronic device having a curved display screen.
  • the display pixel 12 When the display module 1 is in operation, the display pixel 12 emits an optical signal to perform image display.
  • a target object such as a finger
  • the optical signal irradiated to the target object will be reflected due to the occlusion of the target object, and the reflected optical signal is received by the photosensitive device 220, and the photosensitive device 220 will receive the received light.
  • the optical signal is converted into a corresponding electrical signal, and according to the electrical signal, biometric information of the target object can be obtained.
  • the optical signals sensed between the adjacent photosensitive devices 220 may be aliased, thereby causing the acquired biometric information to be blurred, and thus the embodiment of the present invention is sensitive.
  • the display driving circuit 12 drives the display pixels 12 to light-time, that is, the optical signals emitted by the adjacent display pixels 12 are not interfered with each other, and the reflected optical signals are reflected between the optical signals.
  • the photosensitive device 20 obtains accurate biometric information, and the sensing accuracy of the photosensitive device 20 is improved.
  • the plurality of display pixels 12 in the display panel 100 can be independently controlled.
  • the single display pixel 12 is controlled to be lit, the point source illumination can be realized.
  • the light sensing device 220 performs light sensing, only one display pixel 12 emits an optical signal, so that the interference of the optical signal reflected by the target object is less, thereby improving the sensing accuracy of the photosensitive device 20.
  • the single display pixel 12 when the display display pixel 12 is time-divisionally illuminated, the single display pixel 12 is sequentially driven to illuminate, or The plurality of display pixels 12 that are driven far enough apart by a predetermined interval are simultaneously illuminated, so that the light reflected back by the target object interacts with each other sufficiently small.
  • FIG. 3 shows the structure of a photosensitive device according to an embodiment of the present invention.
  • the photosensitive panel 200 further includes a plurality of photosensitive cells 22 and scan line groups and data line groups electrically connected to the plurality of photosensitive cells 22, wherein the scan line group includes a plurality of scan lines 201, and the data line group includes a plurality of data lines 202. .
  • the plurality of photosensitive cells 22 are distributed in an array, such as a matrix distribution. Of course, it can also be distributed in other rule manners or in an irregular manner.
  • a plurality of scanning lines 201 and a plurality of data lines 202 electrically connected to the photosensitive unit 22 are disposed to cross each other and disposed between adjacent photosensitive units 22.
  • a plurality of scanning lines G1, G2, ..., Gm are arranged at intervals in the Y direction, and a plurality of data lines S1, S2, ..., Sn are arranged at intervals in the X direction.
  • the plurality of scanning lines 201 and the plurality of data lines 202 are not limited to the vertical arrangement shown in FIG. 5, and may be disposed at an angle, for example, 30°, 60°, or the like.
  • the scan line 201 and the data line 202 are electrically conductive, the scan line 201 and the data line 202 at the intersection position are separated by an insulating material.
  • the distribution and the number of the scan lines 201 and the data lines 202 are not limited to the above-exemplified embodiments, and the corresponding scan line groups and data lines may be correspondingly arranged according to the structure of the photosensitive unit 22. group.
  • a plurality of scan lines 201 are connected to a photosensitive driving circuit 23, and a plurality of data lines 202 are connected to a signal processing circuit 25.
  • the photosensitive driving circuit 23 is for supplying a corresponding scanning driving signal and transmitting it to the corresponding photosensitive unit 22 through the corresponding scanning line 201 to activate the photosensitive unit 22 to perform light sensing.
  • the photosensitive driving circuit 23 is formed on the substrate 26, and of course, it can also be electrically connected to the photosensitive unit 22 through a connecting member (for example, a flexible circuit board), that is, a plurality of scanning lines 201 are connected.
  • the signal processing circuit 25 receives an electrical signal generated by the corresponding photosensitive unit 22 performing light sensing through the data line 202, and acquires biometric information of the target object based on the electrical signal.
  • the photosensitive device 20 including the photosensitive panel 200 includes a controller 27 for controlling the output of the driving circuit 23 in addition to the signal processing circuit 25 and the photosensitive driving circuit 23 described above.
  • the timing of the corresponding scan drive signal such as, but not limited to, the row-by-row activation of the photosensitive unit 22 performs light sensing.
  • the controller 27 is further configured to control the signal processing circuit 25 to receive the electrical signal output by the photosensitive unit 22, and after receiving the electrical signals output by all the photosensitive units 22 that perform light sensing, generate biometric information of the target object based on the electrical signals. .
  • the signal processing circuit 25 and the controller 27 described above may be selectively formed on the substrate 26 depending on the type of the substrate 26, or may be electrically connected to the photosensitive unit 22, for example, by a connector (for example, a flexible circuit board).
  • a connector for example, a flexible circuit board
  • the signal processing circuit 25 and the controller 27 may alternatively be formed on the substrate 26, and may alternatively be electrically connected to the photosensitive unit 22, for example, via a flexible circuit board;
  • the signal processing circuit 25 and the controller 27 need to be electrically connected to the photosensitive unit 22, for example, via a flexible circuit board.
  • FIG. 4 illustrates a connection structure of the photosensitive unit 22 of the embodiment with the scan line 201 and the data line 202.
  • the photosensitive unit 22 includes a photosensitive device 220 and a switching device 222.
  • the switching device The 220 has a control terminal C and two signal terminals, for example, a first signal terminal Sn1 and a second signal terminal Sn2.
  • the control terminal C of the switching device 220 is connected to the scan line 201.
  • the first signal terminal Sn1 of the switching device 222 is connected to a reference signal L via the photosensitive device 220, and the second signal terminal Sn2 of the switching device 222 is connected to the data line 202.
  • the above-mentioned photosensitive device 220 is, for example but not limited to, any one or several of a photodiode, a phototransistor, a photodiode, a photo resistor, and a thin film transistor.
  • a photodiode as an example, a negative voltage is applied across the photodiode.
  • the photodiode receives the optical signal, a photocurrent is generated in a proportional relationship with the optical signal, and the received optical signal is more intense. Larger, the larger the photocurrent generated, the faster the voltage drop on the negative pole of the photodiode.
  • the intensity of the optical signal reflected from different parts of the target object is obtained, and the target is obtained. Biometric information of the object. It can be understood that in order to increase the photosensitive effect of the photosensitive device 220, a plurality of photosensitive devices 220 may be disposed.
  • the switching device 222 is, for example but not limited to, any one or several of a triode, a MOS transistor, and a thin film transistor.
  • the switching device 222 can also include other types of devices, and the number can also be two, three, and the like.
  • the gate of the thin film transistor TFT serves as the control terminal C of the switching device 222, and the source and the drain of the thin film transistor TFT correspond to the first signal terminal Sn1 of the switching device 222 and The second signal terminal Sn2.
  • the gate of the thin film transistor TFT is connected to the scanning line 201, the source of the thin film transistor TFT is connected to the negative electrode of the photodiode D1, and the drain of the thin film transistor TFT is connected to the data line 202.
  • the anode of the photodiode D1 is connected to a reference signal L, which is, for example, a ground signal or a negative voltage signal.
  • a driving signal is applied to the gate of the thin film transistor TFT through the scanning line 201 to drive the thin film transistor TFT to be turned on.
  • the data line 202 is connected to a positive voltage signal.
  • the positive voltage signal on the data line 202 is applied to the negative electrode of the photodiode D1 via the thin film transistor TFT. Since the positive electrode of the photodiode D1 is grounded, A reverse voltage is applied across the photodiode D1 such that the photodiode D1 is reverse biased, i.e., in operation.
  • the reverse current of the photodiode D1 rapidly increases, thereby causing a change in current on the photodiode D1, which can be obtained from the data line 202. Since the intensity of the optical signal is larger, the reverse current generated is larger. Therefore, according to the current signal acquired on the data line 202, the intensity of the optical signal can be obtained, thereby obtaining the biometric information of the target object.
  • the reference signal L may be a positive voltage signal, a negative voltage signal, a ground signal, or the like. As long as the electrical signal provided on the data line 202 and the reference signal L apply a reverse voltage across the photodiode D1 to perform light sensing, both are within the scope of protection defined by the present invention.
  • connection manner of the thin film transistor TFT and the photodiode D1 in the photosensitive unit 22 is not limited to the connection mode shown in FIG. 4, and may be other connection methods.
  • FIG. 5 shows another The connection structure of the photosensitive unit 22 of the embodiment to the scanning line 201 and the data line 202.
  • the gate G of the thin film transistor TFT is connected to the scanning line 201
  • the drain D of the thin film transistor TFT is connected to the anode of the photodiode D1
  • the source S of the thin film transistor TFT is connected to the data line 202.
  • the negative terminal of the photodiode D1 is connected to a positive voltage signal.
  • FIG. 6 shows a partial structure of a display module according to another embodiment of the present invention. Since the photosensitive panel 200 is located above the display panel 100, the photosensitive panel 200 has a first light-transmissive region P1 through which the optical signal of the display panel 100 passes, and the first transparent region P1 is disposed corresponding to the display pixel 12 so as not to affect The normal display of the display device.
  • the photosensitive panel 200 Since the photosensitive panel 200 is located above the display panel 100, the photosensitive panel 200 is provided with a first light-transmissive area P1, which is disposed corresponding to the display pixel 12 for the display panel, so as not to affect the display of the display panel 100.
  • the light signal emitted by 100 passes through.
  • the area of the first light-transmitting region P1 is slightly larger than the area of the display pixel 12.
  • the scan line 201 is formed on the substrate 26.
  • the area of the data line 202, the light sensing device 220, and the switching device 222 becomes the non-light transmitting region P2 of the photosensitive panel 200.
  • the non-transmissive region P2 is located above the interval H of the display panel 100. Accordingly, the switching device 222 and the photosensitive device 220 are located in the non-transmissive region P2.
  • the non-transmissive region P2 can also become the first light-transmitting region P1 if the components disposed on the photosensitive panel 200 can achieve light transmission or omit some components of the opaque structure.
  • the scan line 201 and the data line 202 may also be made of a transparent conductive material and located in the first light-transmitting region P1. Therefore, in the embodiment of the present invention, the positions and sizes of the first light-transmitting region P1 and the non-light-transmitting region P2 are not strictly limited, and can be flexibly adjusted according to actual conditions.
  • the switching device 222 can be disposed under the photosensitive device 220, or the switching device 222 can be partially overlapped with the photosensitive device 220.
  • the scan line 201 and the data line 202 may also be disposed under the switching device 222.
  • the arrangement of the photosensitive unit 22, the scanning line 201, and the data line 202 can be made more compact, and in the case where the installation area is limited, the photosensitive area of the photosensitive device 220 is increased, thereby enhancing the sensing effect of the photosensitive panel 200.
  • the semiconductor layer and the upper electrode of the photosensitive device 220 may also extend over the switching device 222 to increase the sensing area.
  • the photosensor 220 as a photodiode as an example
  • the anode and the semiconductor layer of the photodiode extend above the switching device 222, covering the switching device 222, and a light shielding layer is further disposed above the region of the anode corresponding to the switching device 222 to prevent the light from illuminating the switching device 222.
  • the cathode of the photodiode is connected to the switching device 222.
  • the cathode is a lower electrode, for example made of a non-transmissive conductive material, such as a metallic material.
  • the finger when the finger touches or approaches the display module 1, if the ambient light is irradiated onto the finger, the finger has many organizational structures, such as the epidermis, the bone, Meat, blood vessels, etc., so part of the light signal in the ambient light will penetrate the finger, and some of the light signal will be absorbed by the finger.
  • the light signal penetrating the finger will reach the photosensitive unit 22, and the photosensitive unit 22 not only senses the light signal reflected by the target object, but also senses the light signal of the ambient light penetrating the finger, so that accurate sensing cannot be performed. .
  • FIG. 7 shows a partial structure of the photosensitive device according to another embodiment of the present invention.
  • the photosensitive device 20 further includes a filter film 29 disposed on the photosensitive panel 200 and disposed corresponding to the photosensitive unit 22.
  • the filter film 29 is for filtering optical signals other than the predetermined wavelength band. According to the embodiment of the present invention, the optical signal outside the predetermined wavelength band of the reflected optical signal is filtered by the filter film 29, thereby improving the sensing accuracy of the photosensitive device 20.
  • the predetermined wavelength band is a wavelength band corresponding to the blue light signal, that is, the filter film 29 filters out optical signals other than the blue light signal.
  • the predetermined band is a band corresponding to the green light signal, that is, the filter film 29 filters out the light signals other than the green light signal.
  • the target object such as a finger absorbs the red light signal the weakest, followed by the green light signal, and absorbs the blue light signal the strongest. That is, ambient light illuminates the finger, and a large amount of blue light signal is absorbed by the finger, and only a small amount or even no blue light signal penetrates the finger. Therefore, by selecting the optical signal of the wavelength band other than the blue light signal or the green light signal for filtering, the interference of the ambient light can be greatly eliminated, and the sensing accuracy of the photosensitive device 20 can be improved.
  • the embodiment of the present invention can also select the photosensitive device 220 with high sensitivity to blue or green light signals.
  • the light sensing is performed by selecting the photosensitive device 220 having high sensitivity to the blue light signal or the green light signal, so that the photosensitive device 220 is more sensitive to the light of the blue light signal or the green light signal, so the ambient light is also avoided to some extent.
  • the interference caused by the red light signal improves the sensing accuracy of the photosensitive device 20.
  • FIG. 8 illustrates a structure of a display module according to another embodiment of the present invention.
  • the photosensitive device 220 is of a light transmitting structure and correspondingly located above the display pixel 12.
  • the display pixel 12 is, for example but not limited to, a red display pixel, a green display pixel, and a blue display pixel.
  • the photosensitive device 220 will cover all of the display pixels 12, that is, the red display pixels, the green display pixels, and the blue display pixels.
  • the photosensitive device 220 is translucent, the photosensitive device 220 is not limited to being disposed in the non-transmissive region P2, but may extend into the transparent region P1, that is, the photosensitive device 220 is transparent to the non-transmissive region P2.
  • the area P1 extends and fills the entire light-transmissive area. This increases the photosensitive area of the photosensitive device 220, thereby enhancing the photosensitive effect of the photosensitive device 220.
  • the photosensitive device 220 may also be disposed in the light-transmitting region P1, thus giving the switching device 222.
  • the scan line 201 and the data line 202 are disposed in the non-transparent area P2 with more layout space.
  • the embodiment of the present invention selects the photosensitive device 220 with high sensitivity to blue or green light signals.
  • the light sensing is performed by selecting the photosensitive device 220 having high sensitivity to the blue light signal or the green light signal, so that the photosensitive device 220 is more sensitive to the light of the blue light signal or the green light signal, so the ambient light is also avoided to some extent.
  • the interference caused by the red light signal improves the sensing accuracy of the photosensitive device 20.
  • FIG. 9 illustrates a structure of a display module according to still another embodiment of the present invention.
  • the display module 1 includes a display device (not shown) and a photosensitive device 20 (please refer to FIG. 3).
  • the display device further includes a display panel 100 for performing image display, and a second light transmissive area (not shown) is disposed in the display area of the display panel 100.
  • the photosensitive device 20 includes a photosensitive panel 200, and the photosensitive panel 200 is disposed under the display panel 100 for sensing an optical signal passing through the second transparent region to obtain contact or proximity to the display module 1. Predetermined biometric information of the target object.
  • the display panel 100 Since the photosensitive panel 200 is located below the display panel 100, the display panel 100 has a second light-transmissive region through which an optical signal reflected by the target object passes, so that the photosensitive panel 200 can receive the light signal passing through the display panel 100, and The received optical signal is converted into an electrical signal, and predetermined biometric information of the target object contacting or approaching the display module 1 is acquired according to the converted electrical signal.
  • the photosensitive device 220 in order to ensure that the light signal passing through the display panel 100 is received by the photosensitive panel 200, the photosensitive device 220 (refer to FIG. 4) in the photosensitive panel 200 is disposed under the second light transmitting region. Further, the photosensitive device 220 is disposed opposite to the second light-transmitting region, thereby ensuring that the light signals passing through the display panel 100 are all received, improving the sensing accuracy of the photosensitive device 20.
  • the display panel 100 is, for example but not limited to, an OLED display device, as long as the display device capable of realizing the display effect and having a light-transmitting region through which the optical signal passes is within the scope of the present invention.
  • FIG. 10 shows a partial structure of the OLED panel of the embodiment.
  • the display panel 100 as an OLED display panel as an example, the display panel 100 further includes a transparent substrate 101.
  • the display pixel 12 includes an anode 102 formed on a transparent substrate 101, a light-emitting layer 103 formed on the anode 102, and a cathode 104 formed on the light-emitting layer 103.
  • the anode 102 and cathode 104 are made of a conductive material.
  • the anode 102 is made of a suitable conductive material such as indium tin oxide (ITO), which is made of a suitable conductive material such as metal or ITO.
  • ITO indium tin oxide
  • the display panel 100 is not limited to an OLED display panel, and may be other suitable types of display panels.
  • the display panel 100 may be a rigid screen of a rigid material or a flexible screen of a flexible material.
  • the embodiments of the present invention The OLED display panel can be a bottom emission type device, a top emission type device, or other suitable structure type display device.
  • FIG. 11 shows a partial structure of a display module according to an embodiment of the present invention.
  • the display pixel 12 includes three display pixels: a red pixel R, a green pixel G, and a blue pixel B.
  • the light signal emitted by the red pixel R is a red light signal
  • the light signal emitted by the green pixel G is a green light signal
  • the blue pixel B The emitted light signal is a blue light signal.
  • the illuminating layer in the red pixel R is a luminescent material that emits a red light signal
  • the illuminating layer in the green pixel G is a luminescent material that emits a green light signal
  • the luminescent layer in the blue pixel B is a luminescent material that emits a blue light signal.
  • the display pixel 12 may further include black pixels, white pixels; or red pixels, green pixels, blue pixels, white pixels, and the like.
  • the display panel 100 can also realize display by using other display technologies, such as color conversion technology, and the light emitted by the blue OLED is absorbed by the fluorescent dye and then transferred to the red, green, and blue light signals.
  • the display pixels 12 in the display panel 100 are not limited to the arrangement shown in FIG. 11 , and may have other arrangements, such as a pentiel arrangement.
  • a space H is provided between adjacent display pixels 12 , and a second light-transmissive area is disposed in the interval H.
  • the photosensitive device 220 in the photosensitive unit 22 is disposed below the interval H between adjacent display pixels.
  • the lower part here is, for example but not limited to, directly below, and it is possible to ensure that sufficient light signals are received at the position. It can be understood that the more the light signal passes through the interval H, the higher the sensing accuracy of the photosensitive device 20.
  • the photosensitive device 220 may be selectively disposed according to actual conditions, for example, the photosensitive device 220 is disposed under a maximum interval between the red display pixel R and the green display pixel G and the blue display pixel B.
  • FIG. 12 illustrates a relative positional relationship between a photosensitive device and a display pixel in a photosensitive unit according to an embodiment.
  • the display pixel 12 is a transparent display pixel structure, and the display pixel 12 is, for example but not limited to, a red pixel R and a green pixel. G and blue pixel B three display pixels.
  • the photosensitive device 220 of the photosensitive unit 22 is disposed under the display pixel 12 correspondingly. It should be noted that the corresponding setting here is used to describe the positional relationship between the photosensitive device 220 and the display pixel 12, and does not mean that a photosensitive device 220 must be disposed under each display pixel 12.
  • the embodiment of the present invention utilizes the light transmissivity of the display pixel 12 to receive an optical signal reflected by the target object and passing through the display pixel to perform biometric information sensing on the target object.
  • the photosensitive device 220 since the photosensitive device 220 is disposed under the display pixel 12, the photosensitive surface of the photosensitive device 220 can be equal to the area of the display pixel 12, which can be realized by using the existing display panel structure, and the preparation of the display module 1 is reduced. Cost, and ensuring that a sufficient number of optical signals in the optical signal passing through the display pixels 12 are received by the photosensitive device 220, improves the sensing accuracy of the photosensitive device 20.
  • the size and shape of the photosensitive panel 200 is adapted to the display panel such that sensing of predetermined biometric information of the target object at or near the display area of the display panel 100 is achieved.
  • the photosensitive panel 200 may also be smaller than the display panel, for example.
  • the sensing area of the photosensitive panel 200 may also be smaller than, greater than, or equal to the display area of the display panel.
  • the display device is further configured to perform touch sensing, and the display driving circuit drives the display pixels of the corresponding touch regions to emit light after the display device detects the touch or proximity of the target object.
  • the light filter film 29 is disposed on the photosensitive panel 200. It should be noted that, since the photosensitive panel 200 is disposed under the display panel 100, the filter film 29 can be separately disposed, and then disposed on the photosensitive panel 200 by, for example, pasting, so that the filter film 29 is prepared. The process is much simpler.
  • the biometric information sensing method of the display module includes the following steps:
  • the display pixels of the control display panel are time-divisionally illuminated, so that the optical signal emitted by the display pixel reaches the target object;
  • the plurality of display pixels 12 in the display panel 100 can be independently controlled, and by controlling the single display pixels 12 to illuminate, the point source illumination can be realized.
  • the photosensitive unit 22 performs light sensing, only one display pixel 12 emits an optical signal, so that the interference of the optical signal reflected by the target object is less, thereby improving the sensing accuracy of the photosensitive device 20.
  • controlling the display pixels 12 to illuminate in a time-division manner controlling a single display pixel 12 to illuminate, or controlling at least two display pixels 12 that are sufficiently far apart at a predetermined interval to simultaneously illuminate, thereby causing the target object to reflect back light.
  • the mutual influence is small enough.
  • driving signals are supplied to the plurality of scanning lines row by row or interlaced to activate the photosensitive unit 22.
  • a scan driving signal is supplied to the first scanning line G1, and the remaining scanning lines do not provide a scanning driving signal; after a predetermined time, the scanning driving signal is supplied to the second scanning line G2, and the rest The scan line does not provide a scan drive signal, and so on, until all scan lines 201 have been scanned.
  • the scan drive signal being provided row by row, and the scan drive signal may be provided alternately.
  • a scan driving signal is supplied to the first scanning line G1, and the remaining scanning lines do not provide a scanning driving signal; after a predetermined time, the scanning driving signal is supplied to the third scanning line G3, and the remaining scanning lines are not provided for scanning.
  • the interlacing here is not limited to one line, and may be separated by two lines, three lines, and the like.
  • the photosensitive device 20 since the photosensitive device 20 includes the filter film 29, assuming that the light signal emitted by the display panel 100 is a white light signal, the reflected light signal is filtered by the filter film 29, and the light signal becomes Weak, photosensitive unit 22 is almost undetectable, so when performing biometric information sensing, the intensity of the optical signal can be increased, that is, the luminous intensity of the display panel 100 can be increased.
  • the display pixel when the display pixel is driven to be time-divisionally illuminated in the above step S11, the display pixel may be driven to emit an optical signal of a preset wavelength band. Specifically, for example, if the filter film 29 is used to filter an optical signal other than the blue light signal, the blue display pixel B driving the display panel 100 emits an optical signal; if the filter film 29 is used for the green light signal When the optical signal is filtered, the green display pixel G of the display panel 100 is driven to emit a signal.
  • the optical signal emitted by the display panel 100 is reflected by the target object, and there is no loss even after filtering through the filter film 29, that is, the light reaching the photosensitive unit 22. There will be no loss of signal.
  • the intensity of the optical signal emitted by the display panel 100 is increased, the intensity of the optical signal sensed by the photosensitive unit 22 is correspondingly increased. In this way, not only the accurate sensing of the optical signal is realized, but also the waste of the optical signal emitted by the display panel 100 is avoided, thereby achieving the purpose of energy saving.
  • FIG. 14 illustrates a sensing method of another embodiment of the present invention.
  • the method further includes:
  • step S10 when the target object contacts or approaches the display module 1, the target object is determined to be in the touch area of the display module 1.
  • the above step S11 further includes: when performing the biometric information sensing of the target object, controlling the display panel 100 to display the display pixels 12 corresponding to the touch region in a time-sharing manner.
  • the above step S12 further includes: providing a scan driving signal to the photosensitive unit 22 corresponding to the touch area. For example, a scan driving signal is supplied to the plurality of scan lines 201 where the touch area is located to drive the photosensitive unit 22 corresponding to the touch area to perform light sensing.
  • the touch area of the target object on the photosensitive panel 200 is first determined, and the display pixel 12 corresponding to the touch area in the display panel 100 is controlled to emit an optical signal according to the touch area. All the display pixels 12 are prevented from emitting light signals for energy saving purposes; and the photosensitive unit 22 that drives the photosensitive panel 200 and the touch area is driven to perform light sensing according to the touch area, thereby avoiding the photosensitive unit 22 of the entire photosensitive panel 200. Performing light sensing speeds up the sensing speed.
  • the photosensitive device 220 since the photosensitive device 220 is disposed corresponding to the display pixel 12, when the display pixel 12 is lit, the photosensitive device 220 corresponding to the display pixel 12 not only senses the target. The light signal reflected by the object also senses the light signal emitted by the display pixel 12, so that the light signal emitted by the display panel 100 interferes with the sensing of the biometric information of the target object. Therefore, when the biometric information sensing is performed, if the photosensitive device 220 is driven to perform light sensing, the corresponding display pixel 12 of the photosensitive device 220 does not light.
  • FIG. 15 illustrates an operation state of a display panel and a photosensitive panel in a sensing method according to still another embodiment of the present invention.
  • the display pixel is distributed and sensitized in the display panel. Photoreceptor in the panel The distribution of the pieces is not limited to this, and there may be other distribution structures.
  • the photosensitive device 220 connected to the scanning line 201a is driven to operate, and light sensing is performed.
  • the display pixel 12b above the photosensitive device 220 is not lit, and is used for the optical signal reflected by the target object to pass through.
  • the display pixels 12 in a row near the display pixel 12b such as the display pixels 12a, are illuminated.
  • the display display pixel 12a adjacent to the display pixel 12b when controlled to be lit, the display display pixel 12a is controlled to light up in a time-sharing manner.
  • the interference of the optical signals reflected by the target object is less, that is, the mutual interference of the optical signals received between the adjacent photosensitive devices 220 is avoided, thereby improving the photosensitive device 20 Sensing accuracy.
  • FIG. 16 shows a structure of an electronic device according to an embodiment of the present invention
  • FIG. 17 shows a cross-sectional structure of the electronic device shown in FIG. A partial structure of the electronic device is shown.
  • the electronic device is provided with the display module of any one of the above embodiments, which is used for image display of an electronic device and for sensing biometric information of a target object contacting or approaching the electronic device.
  • Electronic devices such as, but not limited to, suitable types of electronic products such as consumer electronics, home electronics, vehicle-mounted electronic products, and financial terminal products.
  • consumer electronic products such as mobile phones, tablets, notebook computers, desktop monitors, computer integrated machines.
  • Home-based electronic products such as smart door locks, TVs, refrigerators, wearable devices, etc.
  • Vehicle-mounted electronic products such as car navigation systems, car DVDs, etc.
  • Financial terminal products such as ATM machines, terminals for self-service business, etc.
  • the electronic device shown in FIG. 16 is exemplified by a mobile terminal of the mobile phone type.
  • the display module is also applicable to other suitable electronic products, and is not limited to mobile terminals.
  • a front surface of the mobile terminal 3 is provided with a display panel 100, and a protective cover 300 is disposed above the display panel 100.
  • the screen of the display panel 100 is relatively high, for example, 80% or more.
  • the screen ratio refers to the ratio of the display area 105 of the display panel 100 to the front area of the mobile terminal 3.
  • the photosensitive panel 200 is disposed above the display panel 100 and disposed under the protective cover 300.
  • the photosensitive panel 200 is for sensing predetermined biometric information of a target object that contacts or approaches an arbitrary position of a display area of the display panel 100.
  • the photosensitive panel 200 may be disposed below the display panel 100 so as to be changeable.
  • the photosensitive panel 200 is configured to perform biometric information sensing of a target object at an arbitrary position within a display area of the display panel 100.
  • the display panel 100 has a display area 105 defined by the light-emitting areas of all the display pixels 12 of the display panel 100, and a display area 105 other than the display area 105.
  • the area is a non-display area 106 for setting a circuit such as a display driving circuit for driving the display pixels 12 or a line bonding area for connecting the flexible circuit boards.
  • the photosensitive panel 200 has a sensing area 203 and a non-sensing area 204 defined by the sensing areas of all the photosensitive cells 22 of the photosensitive panel 200, and the area other than the sensing area 203 is the non-sensing area 204.
  • Non-sensing area 204 is used to set the drive
  • the light-sensing unit 22 performs a circuit such as a photo-sensing photosensitive driving circuit 23 or a line bonding region for connecting the flexible circuit board.
  • the shape of the sensing region 203 is consistent with the shape of the display region 105, and the size of the sensing region 203 is greater than or equal to the size of the display region 105, such that the photosensitive panel 200 can be in any position that contacts or approaches the display region 105 of the display panel 100. Sensing of predetermined biometric information of the target object. Further, the area of the photosensitive panel 200 is less than or equal to the area of the display panel 100, and the shape of the photosensitive panel 100 is consistent with the shape of the display panel 100, so that the assembly of the photosensitive panel 200 and the display panel 100 is facilitated. However, in some embodiments, the area of the photosensitive panel 200 may also be larger than the area of the display panel 100.
  • the display panel 100 When the mobile terminal 3 is in a bright screen state and is in the biometric information sensing mode, the display panel 100 emits an optical signal.
  • the photosensitive panel 200 receives the optical signal reflected by the object, converts the received optical signal into a corresponding electrical signal, and acquires predetermined biometric information of the object according to the electrical signal. For example, fingerprint image information.
  • the photosensitive panel 200 can realize sensing of a target object at any position contacting or approaching the display area 105.
  • the sensing area 203 of the photosensitive panel 200 may also be smaller than the display area 105 of the display panel 100 to achieve predetermined biometric information of a target object of a local area of the display area 105 of the display panel 100. Sensing.
  • the photosensitive panel in the display module module utilizes the optical signal emitted by the display panel to realize the biometric information sensing of the target object, and does not need to additionally set the light source, thereby saving the cost of the electronic device and obtaining contact or Biometric information of the target object at an arbitrary position near the display area.
  • the photosensitive device can be fabricated separately and assembled with the display device, thereby accelerating the preparation of the electronic device.
  • the electronic device further includes a touch sensor (not shown) for determining a touch area of the target object for the electronic device when the target object contacts the protective cover Biometric information sensing is performed within the touch area.
  • a touch sensor (not shown) for determining a touch area of the target object for the electronic device when the target object contacts the protective cover Biometric information sensing is performed within the touch area.
  • the touch sensor is either integrated with the protective cover 300 or integrated with the display panel 100 or integrated with the photosensitive panel 200.
  • the integrated touch sensor not only realizes touch detection on the target object, but also reduces the thickness of the electronic device, which is beneficial to the development of the electronic device in the direction of thinning and thinning.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” and “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Position Input By Displaying (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

L'invention concerne un module d'affichage (1) et un dispositif électronique. Le module d'affichage (1) comprend : un appareil d'affichage comprenant un panneau d'affichage (100) pour exécuter un affichage d'image, le panneau d'affichage (100) comprenant une pluralité de pixels d'affichage (12); et un appareil photosensible (20) comprenant un panneau photosensible (200), le panneau photosensible (200) et le panneau d'affichage (100) étant agencés de manière empilée, de façon à acquérir des informations de caractéristique biologique prédéterminées concernant un objet cible touchant ou s'approchant du module d'affichage (1) au moyen de signaux lumineux de détection. L'appareil d'affichage comprend en outre un circuit de commande d'affichage pour commander les pixels d'affichage (12) devant être allumés en partage de temps lorsque le panneau photosensible (200) exécute une détection d'informations de caractéristiques biologiques. Le dispositif électronique (200) comprend le module d'affichage (1).
PCT/CN2017/097912 2017-08-17 2017-08-17 Module d'affichage et dispositif électronique Ceased WO2019033352A1 (fr)

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CN201790000158.6U CN209708601U (zh) 2017-08-17 2017-08-17 显示模组及电子设备

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CN114709249B (zh) * 2022-03-29 2025-02-14 武汉华星光电半导体显示技术有限公司 显示面板以及显示装置

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