WO2021164108A1 - 一种显示面板及电子装置 - Google Patents

一种显示面板及电子装置 Download PDF

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Publication number
WO2021164108A1
WO2021164108A1 PCT/CN2020/083011 CN2020083011W WO2021164108A1 WO 2021164108 A1 WO2021164108 A1 WO 2021164108A1 CN 2020083011 W CN2020083011 W CN 2020083011W WO 2021164108 A1 WO2021164108 A1 WO 2021164108A1
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WO
WIPO (PCT)
Prior art keywords
layer
display panel
filter plate
color
color filter
Prior art date
Application number
PCT/CN2020/083011
Other languages
English (en)
French (fr)
Inventor
刘凡成
Original Assignee
武汉华星光电技术有限公司
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 武汉华星光电技术有限公司 filed Critical 武汉华星光电技术有限公司
Priority to US16/966,018 priority Critical patent/US11971621B2/en
Publication of WO2021164108A1 publication Critical patent/WO2021164108A1/zh

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13312—Circuits comprising photodetectors for purposes other than feedback
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing

Definitions

  • This application relates to the technical field of fingerprint recognition, and in particular to a display panel and an electronic device.
  • Fingerprints are inherent to everyone and unique. With the development of technology, a variety of electronic devices with fingerprint recognition functions have appeared on the market, such as mobile phones, tablets, and smart wearable devices. . In this way, before operating the electronic device with fingerprint identification function, the user only needs to touch the fingerprint identification module of the electronic device with his finger to perform authorization verification, which simplifies the authorization verification process.
  • the fingerprint identification unit performs fingerprint identification based on the light reflected by the finger to the fingerprint identification unit, but all have shortcomings such as large signal noise, resulting in low accuracy of fingerprint identification.
  • the present invention provides a display panel and an electronic device to solve the problem of low fingerprint recognition rate of the display panel.
  • a technical solution adopted by the present application is to provide a display panel, which includes: a backlight module, an array substrate, a liquid crystal layer, a color filter plate, a touch substrate and a fingerprint recognition unit, an array substrate It is arranged on the light-emitting side of the backlight module; the liquid crystal layer is arranged on the side of the array substrate away from the backlight module; the color filter plate is arranged on the side of the liquid crystal layer away from the array substrate; the touch substrate is arranged on the color filter plate away from the liquid crystal layer
  • the fingerprint identification unit is arranged on the side of the color filter plate away from the touch substrate.
  • the fingerprint identification unit includes a photodiode and multiple light-shielding bars.
  • the photodiode is provided on the side of the color filter plate away from the touch substrate.
  • the light-shielding bars are arranged on one side of the photosensitive surface of the photodiode, and the orthographic projection of the plurality of light-shielding bars on the array substrate falls on the orthographic projection of the photodiodes on the array substrate; wherein, the backlight module is used to emit white light.
  • the light is irradiated to the finger touching the touch substrate, and a plurality of light-shielding bars are used to block part of the light reflected from the finger to the photodiode.
  • an electronic device the electronic device includes: a housing and a display panel, the display panel is arranged on the housing; the display panel includes: a backlight module, Array substrate, liquid crystal layer, color filter plate, touch substrate and fingerprint recognition unit.
  • the array substrate is arranged on the light-emitting side of the backlight module; the liquid crystal layer is arranged on the side of the array substrate away from the backlight module; the color filter plate is arranged on the liquid crystal layer The side away from the array substrate; the touch substrate is arranged on the side of the color filter plate away from the liquid crystal layer; the fingerprint recognition unit is arranged on the side of the color filter plate away from the touch substrate, and the fingerprint recognition unit includes a photodiode and a plurality of light-shielding files
  • the photodiode is arranged on the side of the color filter plate away from the touch substrate, the multiple light-shielding bars are arranged on the side of the photosensitive surface of the photodiode, and the orthographic projection of the multiple light-shielding bars on the array substrate falls on the photodiode.
  • the backlight module is used to emit white light to illuminate the finger touching the touch substrate, and a plurality of shading bars are used to block part of the
  • the light emitted by the backlight module obtains pure color light after passing through the color filter plate to illuminate the finger touching the touch substrate.
  • the pure color light can be red light, green light or blue light, and blue light is taken as an example below.
  • the blue light irradiates the finger and is reflected by the finger.
  • the blue light reflected by the finger passes through the color filter plate, and the red and green layers in the color filter plate filter the reflected blue light, thereby filtering out small-angle noise light.
  • the blue layer in the color filter plate will allow the reflected blue light to illuminate the photosensitive surface of the photodiode.
  • the large-angle noise light is blocked by the light-shielding bar, so that the color filter and the light-shielding file
  • the bars cooperate with each other to shield both the small-angle noise light and the large-angle noise light to avoid crosstalk between adjacent fingerprint identification units, so as to improve the accuracy of fingerprint identification.
  • each light-shielding bar only needs to cover a small part of the area, thereby reducing the height of the light-shielding bars and reducing the overall thickness of the display panel.
  • FIG. 1 is a schematic cross-sectional view of an embodiment of a display panel provided by the present application
  • FIG. 2 is a schematic cross-sectional view of another embodiment of the display panel provided by the present application.
  • FIG. 3 is a schematic cross-sectional view of another embodiment of the display panel provided by the present application.
  • FIG. 4 is a schematic diagram of the circuit structure of the fingerprint identification unit provided by the present application.
  • FIG. 5 is a schematic structural diagram of an embodiment of an electronic device provided by the present application.
  • fingerprint lines on each person's finger are different in patterns, break points and intersections, which are unique and remain the same throughout their lives. Based on this, we can associate a person with his fingerprints and compare his fingerprints with pre-saved fingerprint data to verify his true identity.
  • fingerprint recognition technology Thanks to electronic integrated manufacturing technology and fast and reliable algorithm research, optical fingerprint recognition technology in fingerprint recognition technology has begun to enter our daily lives, and it has become the most in-depth, most widely used, and most mature development in biometrics. technology.
  • the working principle of optical fingerprint recognition technology is: the light emitted by the light source in the display panel 100 is irradiated on the finger, reflected by the finger to form reflected light, and the formed reflected light (ie fingerprint signal light) is transmitted to the fingerprint recognition unit 60, and the fingerprint recognition
  • the unit 60 collects the light signal incident on it. Because there are specific lines on the fingerprint, the reflected light intensity is different at each position of the finger, and finally the light signals collected by each fingerprint identification unit 60 are different, and the real identity of the user can be determined based on this.
  • There are multiple fingerprint identification units 60 and each fingerprint identification unit 60 is responsible for fingerprint identification of a partial area. However, at present, there is a phenomenon of light crosstalk between each fingerprint identification unit 60, which leads to a low accuracy of fingerprint identification.
  • FIG. 1 is a schematic cross-sectional view of an embodiment of a display panel 100 provided by the present application.
  • the display panel 100 of the present application includes a backlight module 10, an array substrate 20, a liquid crystal layer 30, a color filter plate 40, a touch substrate 50 and a fingerprint recognition unit 60.
  • the backlight module 10, the array substrate 20, the liquid crystal layer 30, the color filter 40, and the touch substrate 50 are stacked in sequence.
  • the backlight module 10 is used to emit light into the liquid crystal layer 30, and the array substrate 20 is used to control the deflection angle of the liquid crystal layer 30 , So that the light in the liquid crystal layer 30 is irradiated on the color filter plate 40, the touch substrate 50 is used to receive finger touches, the light passing through the color filter plate 40 is irradiated on the finger and reflected to the color filter plate 40 away from the touch
  • the fingerprint recognition unit 60 is on one side of the substrate 50.
  • the backlight module 10 is used to emit white light
  • the array substrate 20 is arranged on the light emitting side of the backlight module 10
  • the liquid crystal layer 30 is arranged on the side of the array substrate 20 away from the backlight module 10
  • the color filter plate 40 is arranged on the The side of the liquid crystal layer 30 away from the array substrate 20, and the touch substrate 50 is disposed on the side of the color filter plate 40 away from the liquid crystal layer 30.
  • the fingerprint recognition unit 60 is provided on the side of the color filter plate 40 far away from the touch substrate 50.
  • the fingerprint recognition unit 60 includes a photodiode 61 and a plurality of light shielding bars 62.
  • the photodiode 61 is provided on the color filter plate 40 away from the touch substrate 50.
  • the photodiode 61 can be arranged on the side of the array substrate 20 as shown in FIG. 1. Of course, the photodiode 61 can also be arranged on the side of the color filter plate 40. On the other hand, the orthographic projection of the plurality of light-shielding bars 62 on the array substrate 20 falls within the orthographic projection of the photodiode 61 on the array substrate 20.
  • the backlight module 10 is used to emit white light to obtain pure color light after passing through the color filter plate 40 to irradiate the finger touching the touch substrate 50.
  • the pure color light may be red light, green light or blue light.
  • blue light is taken as an example for explanation, but it is understandable that when the pure color light is red light or green light, the working principle and the effect of the embodiment are the same.
  • the blue light irradiates the finger and is reflected by the finger.
  • the blue light reflected by the finger passes through the color filter plate 40.
  • the red layer and the green layer in the color filter plate 40 filter the reflected blue light, thereby filtering out small-angle noise light.
  • the blue layer in the color filter plate 40 will allow the reflected blue light to irradiate the photosensitive surface of the photodiode 61.
  • the large-angle noise light is blocked by the shading bar 62, thereby color filtering
  • the light plate 40 and the shading bar 62 cooperate with each other to shield both the small-angle noise light and the large-angle noise light, so as to avoid the phenomenon of crosstalk between adjacent fingerprint identification units 60, so as to improve the accuracy of fingerprint identification.
  • each light-shielding bar 62 only needs to cover a small part of the area, thereby reducing the height of the light-shielding bars 62 and reducing the overall thickness of the display panel 100.
  • the following will explain with the width of the successively adjacent red layer, green layer, and blue layer being 60 microns, but it does not limit the scope of protection to be protected by this application.
  • the precondition for the light-shielding bars 62 to block large-angle noise light at this time is that the height of the light-shielding bars 62 is 50 microns. .
  • the premise that the light-shielding bars 62 need to block large-angle noise light at this time is that the height of the light-shielding bars 62 is 6.25 micrometers. Understandably, the smaller the height of the light-shielding rail 62 is, the higher the feasibility of providing the light-shielding rail 62 is.
  • the material of the shading bar 62 may be polyimide or black acrylic.
  • the number of light-shielding bars 62 cannot be increased indefinitely, although as the number of light-shielding bars 62 increases, the height of the light-shielding bars 62 will decrease accordingly, thereby increasing the number of light-shielding bars 62.
  • the color filter plate 40 includes a color substrate 41 and a first color layer 42 and a second color layer 43 disposed on opposite sides of the color substrate 41.
  • the liquid crystal layer 30 is disposed on the side of the first color layer 42 away from the color substrate 41
  • the touch substrate 50 is disposed on the side of the second color layer 43 away from the color substrate 41.
  • the red layer, the green layer, the blue layer in the first color layer 42 and the red layer in the second color layer 43 are ,
  • the green layer and the blue layer correspond to each other.
  • the first color layer 42 and the second color layer 43 cooperate with each other to further filter out more noise light, so as to further reduce the height of the light-shielding bars 62 and reduce the number of arrangement of the light-shielding bars 62.
  • the first color layer 42 is provided with a first transparent area 44
  • the second color layer 43 is provided with a second transparent area 45 facing the first transparent area 44
  • the photosensitive surface of the photodiode 61 is facing the first transparent area 44.
  • the light reflected by the finger can be directly incident on the photodiode 61 through the first transparent area 44 and the second transparent area 45 to increase the sensitivity of the photodiode 61.
  • both the first transparent area 44 and the second transparent area 45 are areas without red, green and blue resistance, and are generally filled with a transparent material.
  • FIG. 2 is a schematic cross-sectional view of another embodiment of the display panel 100 provided by the present application.
  • the display panel 100 further includes a transparent spacer layer 70, the transparent spacer layer 70 is disposed between the array substrate 20 and the liquid crystal layer 30, and the fingerprint recognition unit 60 is disposed between the color filter plate 40 and the array substrate 20.
  • the thickness of the liquid crystal layer 30 is less than the thickness of the fingerprint identification unit 60.
  • the thickness of the fingerprint identification unit 60 is approximately equal to the sum of the thickness of the liquid crystal layer 30 and the transparent spacer layer 70.
  • the distance between the array substrate 20 and the color filter plate 40 can be adjusted according to the thickness of the transparent spacer layer 70, so that the height of the light shielding bar 62 is appropriate, so that the fingerprint recognition unit 60 just receives the reflected light of the fingerprint in the corresponding area, and is not affected by others. Crosstalk of area reflected light.
  • the thickness of the liquid crystal layer 30 may be 2 ⁇ m to 5 ⁇ m. If the thickness of the liquid crystal layer 30 continues to increase, the response time will be greatly increased.
  • the thickness of the fingerprint identification unit 60 may be 5 micrometers to 10 micrometers.
  • the thickness of the liquid crystal layer 30 is set to 3 microns and the thickness of the transparent spacer layer 70 is set to 3 microns, the thickness of the fingerprint identification unit 60 is 6 microns.
  • the response time of the display panel 100 will increase accordingly, but the increase in the number of light-shielding bars 62 will reduce the aperture ratio of the display panel 100 instead.
  • a transparent spacer layer 70 is provided between the array substrate 20 and the liquid crystal layer 30, and the distance between the array substrate 20 and the color filter plate 40 can be adjusted according to the thickness of the transparent spacer layer 70, so as not to affect the thickness of the liquid crystal layer 30
  • the height of the light-shielding bar 62 is appropriate, so that the fingerprint identification unit 60 just receives the reflected light of the fingerprint in the corresponding area without crosstalk from the reflected light of other areas.
  • the specific implementation is as follows: 1 dispose the photodiode 61 on the array substrate 20; 2 coat a layer of transparent insulating material to form the transparent spacer layer 70; 3 fabricate the liquid crystal layer 30; 4 etch away the transparent spacer at the photodiode 61
  • the layer 70 is coated with a light-shielding material, and then a plurality of light-shielding bars 62 are etched.
  • the fingerprint identification unit 60 and the liquid crystal layer 30 are separately arranged and do not affect each other.
  • the height of the shading bar 62 can be adjusted freely according to the fingerprint identification accuracy without affecting the thickness of the liquid crystal layer 30 to ensure the display panel Normal display of 100.
  • the photodiode 61 and the transparent spacer layer 70 can be arranged in the same layer.
  • a plurality of light-shielding bars 62 support the color filter plate 40 to support the color filter plate 40, thereby improving the overall stability of the display panel 100.
  • FIG. 3 is a schematic cross-sectional view of another embodiment of the display panel 100 provided by the present application
  • FIG. 4 is a schematic diagram of the circuit structure of the fingerprint identification unit 60 provided by the present application.
  • the array substrate 20 includes a base substrate 21 and a display drive circuit 22 located on the side of the base substrate 21 close to the color filter plate 40; the fingerprint identification unit 60 also includes storage capacitors 63 electrically connected to the photodiodes 61, respectively.
  • the display driving circuit 22 and the driving thin film transistor 64 are arranged in the same layer, so that the driving thin film transistor 64 is manufactured while the display driving circuit 22 is manufactured, so as to simplify the manufacturing process of the display panel 100.
  • the display driving circuit 22 includes a first active layer 222, a first source 224, a first gate 226, and a first drain 228.
  • the driving thin film transistor 64 includes a second active layer 642, a second source 644, and a second The gate 646 and the second drain 648.
  • the arrangement of the display driving circuit 22 and the driving thin film transistor 64 in the same layer specifically refers to that the first active layer 222 and the second active layer 642 are arranged in the same layer, the first source 224 and the second source 644 are arranged in the same layer, and the first gate The electrode 226 and the second gate electrode 646 are arranged in the same layer, and the first drain electrode 228 and the second drain electrode 648 are arranged in the same layer.
  • the anode of the photodiode 61 is electrically connected to the first electrode of the storage capacitor 63, the cathode of the photodiode 61 is electrically connected to the second electrode of the storage capacitor 63 and the second drain 648 of the driving thin film transistor 64, and the second electrode of the driving thin film transistor 64 is electrically connected.
  • the gate 646 is electrically connected to the switch control line, the second source 644 of the driving thin film transistor 64 is electrically connected to the signal detection line, and the photodiode 61 is used to convert the fingerprint signal light reflected by the finger into a current signal.
  • the driving thin film transistor 64 is turned on, and the current signal is transmitted to the signal detection line through the driving thin film transistor 64 to perform fingerprint recognition according to the current signal.
  • the transparent spacer layer 70 can also be disposed between the color filter plate 40 and the liquid crystal layer 30.
  • FIG. 5 is a schematic structural diagram of an embodiment of an electronic device 1000 provided by the present application.
  • the electronic device 1000 may include a housing 200 and the display panel 100 described in any embodiment of the present application, and the display panel 100 is disposed on the housing 200.
  • the electronic device 1000 may be a mobile phone, and the electronic device 1000 may also be a computer, a television, a smart wearable, and the like.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Image Input (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种显示面板（100）及电子装置，显示面板（100）包括：背光模组（10）、阵列基板（20）、液晶层（30）、彩色滤光板（40）、触摸基板（50）和指纹识别单元（60），阵列基板（20）设置在背光模组（10）的出光侧；液晶层（30）设置在阵列基板（20）的远离背光模组（10）的一侧；彩色滤光板（40）设置在液晶层（30）的远离阵列基板（20）的一侧；触摸基板（50）设置在彩色滤光板（40）的远离液晶层（30）的一侧；指纹识别单元（60）设置在彩色滤光板（40）的远离触摸基板（50）的一侧，指纹识别单元（60）包括光敏二极管（61）和多个遮光档条（62），光敏二极管（61）设置在彩色滤光板（40）的远离触摸基板（50）的一侧，多个遮光档条（62）设置在光敏二极管（61）的感光面的一侧，多个遮光档条（62）在阵列基板（20）上的正投影落在光敏二极管（61）在阵列基板（20）上的正投影里，能够提高指纹识别的准确率。

Description

一种显示面板及电子装置 技术领域
本申请涉及指纹识别的技术领域，特别是涉及一种显示面板及电子装置。
 背景技术
指纹对于每一个人而言是与身俱来的，是独一无二的，随着科技的发展，市场上出现了多种带有指纹识别功能的电子装置，如手机、平板电脑以及智能可穿戴设备等。这样，用户在操作带有指纹识别功能的电子装置前，只需要用手指触摸电子装置的指纹识别模组，就可以进行权限验证，简化了权限验证过程。
 技术问题
在指纹识别过程中，指纹识别单元根据手指反射到指纹识别单元上的光线进行指纹识别，但是均存在信噪大等缺点，造成指纹识别的准确率偏低。
 技术解决方案
本发明提供一种显示面板及电子装置，以解决显示面板的指纹识别率低的问题。
为解决上述技术问题，本发明申请采用的一个技术方案是：提供一种显示面板，该显示面板包括：背光模组、阵列基板、液晶层、彩色滤光板、触摸基板和指纹识别单元，阵列基板设置在背光模组的出光侧；液晶层设置在阵列基板的远离背光模组的一侧；彩色滤光板设置在液晶层的远离阵列基板的一侧；触摸基板设置在彩色滤光板的远离液晶层的一侧；指纹识别单元设置在彩色滤光板的远离触摸基板的一侧，指纹识别单元包括光敏二极管和多个遮光档条，光敏二极管设置在彩色滤光板的远离触摸基板的一侧，多个遮光档条设置在光敏二极管的感光面的一侧，多个遮光档条在阵列基板上的正投影落在光敏二极管在阵列基板上的正投影里；其中，背光模组用于发出白色光以照射至触摸于触摸基板上的手指，多个遮光档条用于遮挡部分从手指上反射至光敏二极管上的光。
为解决上述技术问题，本发明申请采用的另一个技术方案是：提供一种电子装置，该电子装置包括：壳体和显示面板，显示面板设置在壳体上；显示面板包括：背光模组、阵列基板、液晶层、彩色滤光板、触摸基板和指纹识别单元，阵列基板设置在背光模组的出光侧；液晶层设置在阵列基板的远离背光模组的一侧；彩色滤光板设置在液晶层的远离阵列基板的一侧；触摸基板设置在彩色滤光板的远离液晶层的一侧；指纹识别单元设置在彩色滤光板的远离触摸基板的一侧，指纹识别单元包括光敏二极管和多个遮光档条，光敏二极管设置在彩色滤光板的远离触摸基板的一侧，多个遮光档条设置在光敏二极管的感光面的一侧，多个遮光档条在阵列基板上的正投影落在光敏二极管在阵列基板上的正投影里；其中，背光模组用于发出白色光以照射至触摸于触摸基板上的手指，多个遮光档条用于遮挡部分从手指上反射至光敏二极管上的光。
 有益效果
本申请的有益效果：背光模组发出的光在经过彩色滤光板后得到纯色光以照射至触摸于触摸基板上的手指上，纯色光可以是红光、绿光或者蓝光，以下以蓝光为例进行讲解。蓝光照射至手指并被手指反射，通过手指反射的蓝光通过彩色滤光板，彩色滤光板中的红色层和绿色层将反射的蓝光过滤，从而过滤掉小角度的杂讯光。彩色滤光板中的蓝色层将允许反射的蓝光照射至光敏二极管的感光面上，反射的蓝光在照射至光敏二极管时大角度杂讯光被遮光档条遮挡住，从而彩色滤光板和遮光档条相互配合将小角度的杂讯光和大角度的杂讯光都屏蔽住，避免相邻的指纹识别单元出现串扰的现象，以提高指纹识别的准确性。另外，遮光档条的数量为多个，则每个遮光档条只需要负责遮挡少部分的区域，从而降低遮光档条的高度，以降低显示面板的整体厚度。
 附图说明
图1是本申请提供的显示面板的一实施例的截面示意图；
图2是本申请提供的显示面板的另一实施例的截面示意图；
图3是本申请提供的显示面板的另一实施例的截面示意图；
图4是本申请提供的指纹识别单元的电路结构示意图；
图5是本申请提供的电子装置的一实施例的结构示意图。
 本发明的实施方式
下面将对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
每个人手指上的指纹纹路在图案、断点和交叉点上各不相同，呈现唯一性且终生不变。据此，我们可以把一个人同他的指纹对应起来，通过将他的指纹和预先保存的指纹数据进行比较，以验证他的真实身份，这就是指纹识别技术。得益于电子集成制造技术和快速而可靠的算法研究，指纹识别技术中光学指纹识别技术已经开始走入我们的日常生活，成为目前生物检测学中研究最深入、应用最广泛、发展最成熟的技术。
光学指纹识别技术的工作原理为：显示面板100中光源发出的光线照射到手指上，经手指反射形成反射光，所形成的反射光（即指纹信号光）传输至指纹识别单元60中，指纹识别单元60对入射到其上的光信号进行采集。由于指纹上存在特定的纹路，在手指各位置处形成反射光强度不同，最终使得各指纹识别单元60所采集到的光信号不同，据此可以确定用户真实身份。指纹识别单元60为多个，每个指纹识别单元60各自负责部分区域的指纹识别。但是目前各个指纹识别单元60之间存在光线串扰的现象，从而导致指纹识别的准确率不高。
请参阅图1，图1是本申请提供的显示面板100的一实施例的截面示意图。
本申请的显示面板100包括背光模组10、阵列基板20、液晶层30、彩色滤光板40、触摸基板50和指纹识别单元60。
背光模组10、阵列基板20、液晶层30、彩色滤光板40、触摸基板50依次层叠设置，背光模组10用于发光至液晶层30中，阵列基板20用于控制液晶层30的偏转角度，以使液晶层30中的光照射至彩色滤光板40上，触摸基板50用于接收手指按摸，经过彩色滤光板40的光照射至手指上并反射至设置在彩色滤光板40的远离触摸基板50的一侧的指纹识别单元60上。
具体地，背光模组10用于发出白色光，阵列基板20设置在背光模组10的出光侧，液晶层30设置在阵列基板20的远离背光模组10的一侧，彩色滤光板40设置在液晶层30的远离阵列基板20的一侧，触摸基板50设置在彩色滤光板40的远离液晶层30的一侧。指纹识别单元60设置在彩色滤光板40的远离触摸基板50的一侧，指纹识别单元60包括光敏二极管61和多个遮光档条62，光敏二极管61设置在彩色滤光板40的远离触摸基板50的一侧，光敏二极管61可以如图1所示设置在阵列基板20侧，当然，光敏二极管61也可以设置在彩色滤光板40侧，多个遮光档条62设置在光敏二极管61的感光面的一侧，多个遮光档条62在阵列基板20上的正投影落在光敏二极管61在阵列基板20上的正投影里。
在本实施例中，背光模组10用于发出白色光在经过彩色滤光板40后得到纯色光以照射至触摸于触摸基板50上的手指上，纯色光可以是红光、绿光或者蓝光，在下述实施例中以蓝光为例进行讲解，但是可以理解地，纯色光为红光或者绿光时，工作原理和实施例效果是相同的。
蓝光照射至手指并被手指反射，通过手指反射的蓝光通过彩色滤光板40，彩色滤光板40中的红色层和绿色层将反射的蓝光过滤，从而过滤掉小角度的杂讯光。彩色滤光板40中的蓝色层将允许反射的蓝光照射至光敏二极管61的感光面上，反射的蓝光在照射至光敏二极管61时大角度杂讯光被遮光档条62遮挡住，从而彩色滤光板40和遮光档条62相互配合将小角度的杂讯光和大角度的杂讯光都屏蔽住，避免相邻的指纹识别单元60出现串扰的现象，以提高指纹识别的准确性。
另外，遮光档条62的数量为多个，则每个遮光档条62只需要负责遮挡少部分的区域，从而降低遮光档条62的高度，以降低显示面板100的整体厚度。以下将以依次相邻的红色层、绿色层、蓝色层的宽度为60微米进行解释，但是不对本申请所要保护的范围造成限定。
具体地，当遮光档条62的数量为两个且位于光敏二极管61的相对两端时，此时遮光档条62需要达到遮挡大角度杂讯光的前提是遮光档条62的高度为50微米。
当遮光档条62的数量为八个且依次均匀排布于光敏二极管61上时，此时遮光档条62需要达到遮挡大角度杂讯光的前提是遮光档条62的高度为6.25微米。可以理解地，遮光档条62的高度越小，设置遮光档条62的可行性越高。
遮光档条62的材质可以是聚酰亚胺或者黑色亚克力。
值得注意的是，遮光档条62的数量也不可能无限制的增加，虽然随着遮光档条62的数量的增加，遮光档条62的高度会相应的降低，从而增加了设置遮光档条62的可行性，当遮光档条62的数量超过极限后，光敏二极管61的有效开口率会下降，从而影响有效信号的采集。
彩色滤光板40包括彩色基板41和设置在彩色基板41的相对两侧的第一彩色层42和第二彩色层43，液晶层30设置在第一彩色层42的远离彩色基板41的一侧，触摸基板50设置在第二彩色层43的远离彩色基板41的一侧，值得注意的是，第一彩色层42中的红色层、绿色层、蓝色层和第二彩色层43中的红色层、绿色层、蓝色层相互对应。第一彩色层42和第二彩色层43相互配合进一步过滤掉更多的杂讯光，以进一步降低遮光档条62的高度和减少遮光档条62的布置数量。
第一彩色层42设置有第一透明区44，第二彩色层43设置有与第一透明区44正对的第二透明区45，光敏二极管61的感光面正对第一透明区44。手指反射的光可以直接通过第一透明区44和第二透明区45入射至光敏二极管61上，以增大光敏二极管61的感光强度。值得解释的是，第一透明区44和第二透明区45均是无红绿蓝色阻的区域，一般用透明材料填充得到。
请参阅图2，图2是本申请提供的显示面板100的另一实施例的截面示意图。
在另一实施例中，显示面板100还包括透明隔垫层70，透明隔垫层70设置在阵列基板20和液晶层30之间，指纹识别单元60设置在彩色滤光板40和阵列基板20之间，其中，液晶层30的厚度小于指纹识别单元60的厚度，具体地，指纹识别单元60的厚度大致等于液晶层30和透明隔垫层70的厚度之和。可以根据透明隔垫层70的厚度调整阵列基板20与彩色滤光板40的距离，以使遮光档条62的高度合适，从而指纹识别单元60正好接收到对应区域指纹的反射光，而不受其他区域反射光的串扰。
液晶层30的厚度可以是2微米至5微米，如果液晶层30的厚度继续增加，则响应时间会大幅增加。指纹识别单元60的厚度可以是5微米至10微米。
例如，液晶层30的厚度设置为3微米，透明隔垫层70的厚度设置为3微米，则指纹识别单元60的厚度为6微米。一般情况下液晶层30的厚度增加，则显示面板100的响应时间也会相应增加，但是遮光档条62的数量增多反而会降低显示面板100的开口率。在阵列基板20和液晶层30之间设置透明隔垫层70，可以根据透明隔垫层70的厚度调整阵列基板20与彩色滤光板40的距离，以在不影响液晶层30的厚度的前提下使遮光档条62的高度合适，从而指纹识别单元60正好接收到对应区域指纹的反射光，而不受其他区域反射光的串扰。
具体地实现方式为：1在阵列基板20上设置光敏二极管61；2涂布一层透明绝缘材料以形成透明隔垫层70；3制作液晶层30；4蚀刻掉光敏二极管61处的透明隔垫层70，并涂布遮光材料，再蚀刻出多个遮光档条62。
在本实施例中，指纹识别单元60与液晶层30分别独立设置，彼此不影响，遮光档条62的高度可以根据指纹识别精度进行自由调节，而不影响液晶层30的厚度，以保证显示面板100的正常显示。
可选地，光敏二极管61可以和透明隔垫层70同层设置。
可选地，多个遮光档条62顶持彩色滤光板40，以支撑彩色滤光板40，从而提高显示面板100的整体稳定性。
请参阅图3和图4，图3是本申请提供的显示面板100的另一实施例的截面示意图，图4是本申请提供的指纹识别单元60的电路结构示意图。
具体地，阵列基板20包括衬底基板21和位于衬底基板21的靠近彩色滤光板40的一侧的显示驱动电路22；指纹识别单元60还包括分别与光敏二极管61电性连接的存储电容63和驱动薄膜晶体管64，显示驱动电路22与驱动薄膜晶体管64同层设置从而在制作显示驱动电路22的同时制作出驱动薄膜晶体管64，以简化显示面板100的制作流程。
显示驱动电路22包括第一有源层222、第一源极224、第一栅极226和第一漏极228，驱动薄膜晶体管64包括第二有源层642、第二源极644、第二栅极646和第二漏极648。显示驱动电路22和驱动薄膜晶体管64同层设置具体指，第一有源层222和第二有源层642同层设置，第一源极224和第二源极644同层设置，第一栅极226和第二栅极646同层设置，第一漏极228和第二漏极648同层设置。
光敏二极管61的正极与存储电容63的第一电极电连接，光敏二极管61的负极与存储电容63的第二电极以及驱动薄膜晶体管64的第二漏极648电连接，驱动薄膜晶体管64的第二栅极646与开关控制线电连接，驱动薄膜晶体管64的第二源极644与信号检测线电连接，光敏二极管61用于将手指反射的指纹信号光转换成电流信号。在指纹识别阶段，驱动薄膜晶体管64导通，所述电流信号经驱动薄膜晶体管64传输至信号检测线，以根据所述电流信号进行指纹识别。
当然，在另一实施例中，透明隔垫层70也可以设置在彩色滤光板40和液晶层30之间。
请参阅图5，图5是本申请提供的电子装置1000的一实施例的结构示意图。
电子装置1000可以包括壳体200和本申请任意实施例所述的显示面板100，显示面板100设置在壳体200上。电子装置1000可以为手机，电子装置1000也可以为电脑、电视机、智能穿戴等。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (18)

  1. 一种显示面板，其特征在于其中，所述显示面板包括：
    背光模组；
    阵列基板，设置在所述背光模组的出光侧；
    液晶层，设置在所述阵列基板的远离所述背光模组的一侧；
    彩色滤光板，设置在所述液晶层的远离所述阵列基板的一侧；
    触摸基板，设置在所述彩色滤光板的远离所述液晶层的一侧；及
    指纹识别单元，设置在所述彩色滤光板的远离所述触摸基板的一侧，所述指纹识别单元包括光敏二极管和多个遮光档条，所述光敏二极管设置在所述彩色滤光板的远离所述触摸基板的一侧，所述多个遮光档条设置在所述光敏二极管的感光面的一侧，所述多个遮光档条在所述阵列基板上的正投影落在所述光敏二极管在所述阵列基板上的正投影里；
    其中，所述背光模组用于发出白色光以照射至触摸于所述触摸基板上的手指，所述多个遮光档条用于遮挡部分从所述手指上反射至所述光敏二极管上的光。
  2. 根据权利要求1所述的显示面板，其特征在于其中，所述彩色滤光板包括彩色基板和设置在所述彩色基板的相对两侧的第一彩色层和第二彩色层，所述液晶层设置在所述第一彩色层的远离所述彩色基板的一侧，所述触摸基板设置在所述第二彩色层的远离所述彩色基板的一侧。
  3. 根据权利要求2所述的显示面板，其特征在于其中，所述第一彩色层设置有第一透明区，所述第二彩色层设置有与所述第一透明区正对的第二透明区，所述光敏二极管的感光面正对所述第一透明区。
  4. 根据权利要求1所述的显示面板，其特征在于其中，
    所述显示面板还包括透明隔垫层，所述透明隔垫层设置在所述阵列基板和所述液晶层之间，所述指纹识别单元设置在所述彩色滤光板和所述阵列基板之间。
  5. 根据权利要求4所述的显示面板，其特征在于其中，所述阵列基板包括衬底基板和位于所述衬底基板的靠近所述彩色滤光板的一侧的显示驱动电路；所述指纹识别单元还包括分别与所述光敏二极管电性连接的存储电容和驱动薄膜晶体管，所述显示驱动电路与所述驱动薄膜晶体管同层设置。
  6. 根据权利要求5所述的显示面板，其特征在于其中，所述显示驱动电路包括第一有源层、第一源极、第一栅极和第一漏极，所述显示驱动电路包括第二有源层、第二源极、第二栅极和第二漏极，所述第一有源层和所述第二有源层同层设置，所述第一源极和所述第二源极同层设置，所述第一栅极和所述第二栅极同层设置，所述第一漏极和所述第二漏极同层设置。
  7. 根据权利要求5所述的显示面板，其特征在于其中，所述光敏二极管与所述透明隔垫层同层设置。
  8. 根据权利要求4所述的显示面板，其特征在于其中，所述多个遮光档条顶持所述彩色滤光板。
  9. 根据权利要求1所述的显示面板，其特征在于其中，
    所述显示面板还包括透明隔垫层，所述透明隔垫层设置在所述彩色滤光板和所述液晶层之间，所述指纹识别单元设置在所述彩色滤光板和所述阵列基板之间。
  10. 一种电子装置，其特征在于其中，所述电子装置包括壳体和权利要求1至9任一项所述的显示面板，所述显示面板设置在所述壳体上；
    所述显示面板包括：
    背光模组；
    阵列基板，设置在所述背光模组的出光侧；
    液晶层，设置在所述阵列基板的远离所述背光模组的一侧；
    彩色滤光板，设置在所述液晶层的远离所述阵列基板的一侧；
    触摸基板，设置在所述彩色滤光板的远离所述液晶层的一侧；及
    指纹识别单元，设置在所述彩色滤光板的远离所述触摸基板的一侧，所述指纹识别单元包括光敏二极管和多个遮光档条，所述光敏二极管设置在所述彩色滤光板的远离所述触摸基板的一侧，所述多个遮光档条设置在所述光敏二极管的感光面的一侧，所述多个遮光档条在所述阵列基板上的正投影落在所述光敏二极管在所述阵列基板上的正投影里；
    其中，所述背光模组用于发出白色光以照射至触摸于所述触摸基板上的手指，所述多个遮光档条用于遮挡部分从所述手指上反射至所述光敏二极管上的光。
  11. 根据权利要求10所述的显示面板，其中，所述彩色滤光板包括彩色基板和设置在所述彩色基板的相对两侧的第一彩色层和第二彩色层，所述液晶层设置在所述第一彩色层的远离所述彩色基板的一侧，所述触摸基板设置在所述第二彩色层的远离所述彩色基板的一侧。
  12. 根据权利要求11所述的显示面板，其中，所述第一彩色层设置有第一透明区，所述第二彩色层设置有与所述第一透明区正对的第二透明区，所述光敏二极管的感光面正对所述第一透明区。
  13. 根据权利要求10所述的显示面板，其中，
    所述显示面板还包括透明隔垫层，所述透明隔垫层设置在所述阵列基板和所述液晶层之间，所述指纹识别单元设置在所述彩色滤光板和所述阵列基板之间。
  14. 根据权利要求13所述的显示面板，其中，所述阵列基板包括衬底基板和位于所述衬底基板的靠近所述彩色滤光板的一侧的显示驱动电路；所述指纹识别单元还包括分别与所述光敏二极管电性连接的存储电容和驱动薄膜晶体管，所述显示驱动电路与所述驱动薄膜晶体管同层设置。
  15. 根据权利要求14所述的显示面板，其中，所述显示驱动电路包括第一有源层、第一源极、第一栅极和第一漏极，所述显示驱动电路包括第二有源层、第二源极、第二栅极和第二漏极，所述第一有源层和所述第二有源层同层设置，所述第一源极和所述第二源极同层设置，所述第一栅极和所述第二栅极同层设置，所述第一漏极和所述第二漏极同层设置。
  16. 根据权利要求14所述的显示面板，其中，所述光敏二极管与所述透明隔垫层同层设置。
  17. 根据权利要求13所述的显示面板，其中，所述多个遮光档条顶持所述彩色滤光板。
  18. 根据权利要求10所述的显示面板，其中，
    所述显示面板还包括透明隔垫层，所述透明隔垫层设置在所述彩色滤光板和所述液晶层之间，所述指纹识别单元设置在所述彩色滤光板和所述阵列基板之间。
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