WO2022073265A1 - 一种显示装置及其指纹识别方法 - Google Patents

一种显示装置及其指纹识别方法 Download PDF

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Publication number
WO2022073265A1
WO2022073265A1 PCT/CN2020/125036 CN2020125036W WO2022073265A1 WO 2022073265 A1 WO2022073265 A1 WO 2022073265A1 CN 2020125036 W CN2020125036 W CN 2020125036W WO 2022073265 A1 WO2022073265 A1 WO 2022073265A1
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WO
WIPO (PCT)
Prior art keywords
display device
light source
backlight module
display panel
light
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/CN2020/125036
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English (en)
French (fr)
Inventor
惠志城
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.)
Wuhan China Star Optoelectronics Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Technology Co Ltd
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Filing date
Publication date
Application filed by Wuhan China Star Optoelectronics Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Technology Co Ltd
Priority to US16/972,641 priority Critical patent/US11823484B2/en
Publication of WO2022073265A1 publication Critical patent/WO2022073265A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/141—Control of illumination
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F39/00—Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group H10F30/00, e.g. radiation detectors comprising photodiode arrays
    • H10F39/10—Integrated devices
    • H10F39/12—Image sensors
    • H10F39/18—Complementary metal-oxide-semiconductor [CMOS] image sensors; Photodiode array image sensors

Definitions

  • the present application relates to the field of display technology, and in particular, to a display device and a fingerprint identification method thereof.
  • liquid crystal display panel As the most widely used display screen at present, liquid crystal display panel has its advantages in price and comprehensive performance.
  • a backlight module needs to be set to provide backlight. If the fingerprint recognition module is set under the backlight module
  • the light source of the backlight module is used to provide the light source required for fingerprint identification, because the imaging performance of the backlight module is poor, and the backlight source cannot meet the light requirements of fingerprint identification, resulting in the inability to realize fingerprint identification under the screen, resulting in user experience. poor. Therefore, it is necessary to improve this defect.
  • the present application provides a display device and a fingerprint identification method thereof, which are used to solve the technical problem that the display device in the prior art cannot realize the fingerprint identification under the screen.
  • An embodiment of the present application provides a display device including a backlight module, a display panel located on the backlight module, and a cover plate located on the display panel.
  • a transparent optical sensor layer is arranged between the backlight module and the display panel.
  • a first light source is disposed on the side of the cover plate facing the display panel.
  • the first light source and the display panel are arranged on the same layer.
  • the first light source is a light emitting diode.
  • the transparent optical sensor layer is composed of a plurality of complementary metal oxide semiconductor sensors.
  • the complementary metal oxide semiconductor sensor includes an image acquisition unit and a signal processing unit.
  • an insulating layer is provided between the transparent optical sensor layer and the backlight module.
  • an optical adhesive layer is disposed between the transparent optical sensor layer and the display panel.
  • the backlight module includes a reflective sheet, a light guide plate located on the reflective sheet, a second light source located on one side of the light guide plate, and a second light source located on the light guide plate optical film set.
  • the optical film set includes a diffusion sheet, a prism sheet, and a reflective polarized brightness enhancement film.
  • the backlight module includes a reflection sheet, a third light source located on the reflection sheet, a diffuser plate located on the third light source, and a diffuser plate located between the diffuser plate. on the optical diaphragm set.
  • the optical film set includes a diffusion sheet, a prism sheet, and a reflective polarized brightness enhancement film.
  • An embodiment of the present application also provides a fingerprint identification method for a display device, including the steps of: providing a display device, the display device includes a control module, a backlight module, a display panel located on the backlight module, a display panel located on the backlight module A touch panel on the display panel and a cover panel on the touch panel, wherein a transparent optical sensor layer is arranged between the backlight module and the display panel, and the cover panel faces the surface of the display panel.
  • the first light source and the display panel are arranged on the same layer.
  • the first light source is a light emitting diode.
  • the transparent optical sensor layer is composed of a plurality of complementary metal oxide semiconductor sensors.
  • the complementary metal oxide semiconductor sensor includes an image acquisition unit and a signal processing unit.
  • an insulating layer is provided between the transparent optical sensor layer and the backlight module.
  • an optical adhesive layer is disposed between the transparent optical sensor layer and the display panel.
  • the backlight module includes a reflective sheet, a light guide plate located on the reflective sheet, a second light source located on one side of the light guide plate, and a second light source located on the The optical film set above the light guide plate.
  • the backlight module includes a reflection sheet, a third light source located on the reflection sheet, a diffusion plate located on the third light source, and a The optical film set above the diffuser plate.
  • a transparent optical sensor layer is arranged between the backlight module and the display panel, and a first light source is arranged under the cover plate, and the emitted light of the first light source and the reflected light formed by the finger do not need to be
  • the transparent optical sensor layer can quickly and accurately perform full-screen fingerprint recognition without affecting the structure and brightness of the backlight module, and the process is simple.
  • FIG. 1 is a schematic diagram of a basic structure of a display device provided by an embodiment of the present application.
  • FIG. 2 is a functional block diagram of a complementary metal oxide semiconductor sensor provided by an embodiment of the present application.
  • FIG. 3 is a structural block diagram of a complementary metal oxide semiconductor sensor provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a basic structure of a backlight module provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the basic structure of another backlight module provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a basic structure of another display device provided by an embodiment of the present application.
  • the display device includes a backlight module 101 , a display panel 102 located on the backlight module 101 , and a display panel 102 located on the backlight module 101 .
  • the cover plate 103 above; wherein, a transparent optical sensor layer 104 is arranged between the backlight module 101 and the display panel 102, and a first light source is arranged on the side of the cover plate 103 facing the display panel 102 105.
  • the transparent optical sensor layer 104 can quickly and accurately perform full-screen fingerprint recognition without affecting the structure and brightness of the backlight module 101, and the process is simple.
  • the ridge lines on the finger are in contact with the surface of the cover plate 103, and the valley lines are not in contact with the surface of the cover plate 103. Therefore, the ridge lines on the fingerprint are irradiated on the surface of the cover plate 103.
  • the light on the surface of the cover plate 103 in the contact portion is diffusely reflected, while the light irradiated on the surface of the cover plate 103 corresponding to the fingerprint valley line is totally reflected, so that the light emitted by the surface of the cover plate 103 collected by the transparent optical sensor layer 104 is totally reflected.
  • the color of the part corresponding to the ridge line of the fingerprint is darker, and the color of the part corresponding to the valley line of the fingerprint is lighter.
  • the first light source 105 and the display panel 102 are disposed on the same layer. As shown in FIG. 1 , the first light source 105 is disposed on the left side of the display panel 102 , and the backlight module 101 is disposed on the lower side of the display panel 102 , so the first light source 105 is far from the cover plate 103 More recently, when fingerprint recognition is performed, the emitted light formed by the first light source 105 can quickly cover the surface of the cover plate 103, and cooperate with the transparent optical sensor layer 104 disposed between the display panel 102 and the backlight module 101, Full-screen fingerprint recognition can be achieved. It solves the technical problem that the light transmittance of the backlight module is poor, and the backlight cannot meet the requirements of fingerprint recognition for light, resulting in the inability to perform fingerprint recognition. Simple.
  • the first light source 105 is a light emitting diode.
  • the light emitting diode has high luminous efficiency and low cost, and can be fixed on the plastic frame of the display device during use.
  • the first light source 105 is placed obliquely, and the inclination angle is at a certain angle with the horizontal direction. The specific situation depends on the light-emitting distance and light-emitting range satisfying the radiation to the entire cover plate area. This application does not limited to this.
  • the transparent optical sensor layer 104 is composed of a plurality of complementary metal oxide semiconductor sensors.
  • the complementary metal oxide semiconductor sensor uses a photodiode to perform photoelectric conversion, and converts the collected image (electrical signal, that is, an analog signal) into a digital signal for output.
  • an insulating layer 106 is disposed between the transparent optical sensor layer 104 and the backlight module 101 .
  • the material of the insulating layer 106 is polyethylene terephthalate, which has good electrical insulation and high transparency, and can block ultraviolet rays.
  • an optical adhesive layer 107 is disposed between the transparent optical sensor layer 104 and the display panel 102 . That is, the display panel 102 is connected to the transparent optical sensor layer 104 through the optical adhesive layer 107. Specifically, the optical adhesive layer 107 may be formed on the bottom of the display panel 102 first, and then the transparent optical sensor may be The upper surface of the layer 104 is attached to the other side of the optical adhesive layer 107, and then cured; or the optical adhesive layer 107 is first formed on the upper surface of the transparent optical sensor layer 104, and then the display The bottom of the panel 102 is attached to the upper surface of the optical adhesive layer 107, and is finally cured.
  • the display device further includes a back frame 108 , and the backlight module 101 is disposed on the back frame 108 .
  • the back frame 108 may be an iron frame or a rubber-iron composite frame.
  • the complementary metal oxide semiconductor sensor includes an image acquisition unit 201 and a signal processing unit 202 .
  • the image acquisition unit 201 is used to collect the fingerprint image of the user and convert the optical signal into an electrical signal
  • the signal processing unit 202 is used to process the fingerprint image collected by the image acquisition unit 201 to convert the electrical signal into an electrical signal. The signal is converted into a digital signal, then amplified and output.
  • the complementary metal oxide semiconductor sensor is controlled by a photosensitive element array 2011 , a horizontal shift register 2012 , a vertical shift register 2013 , and a
  • the circuit 2021, the sequential circuit 2022, the analog/digital converter 2023 and the output amplifier 2024 are composed, and these parts are usually integrated on the same silicon chip. Its working process can generally be divided into reset, photoelectric conversion, integration and readout.
  • the photosensitive element array 2011 receives the reflected light
  • the photosensitive element array 2011 is a two-dimensional pixel array
  • each pixel unit is composed of a photodiode and a MOS (Metal-Oxide-Semiconductor, metal-oxide-
  • MOS Metal-Oxide-Semiconductor, metal-oxide-
  • the photodiode in each pixel unit converts the light intensity on its array surface into an electrical signal
  • the control circuit 2021 controls the horizontal shift register 2012 and the vertical shift register 2013 to select the pixel unit, and the pixel unit is
  • the electrical signal on the image is read out and transmitted to the analog/digital converter 2023 , which converts the electrical signal into a digital image signal, which is amplified by the output amplifier 2024 and then output.
  • the horizontal shift register 2012 sequentially turns on the MOS transistors that perform horizontal scanning from left to right, that is, the addressing column
  • the vertical shift register 2013 sequentially addresses each row of the array, that is, in the Under the action of the pulses generated by the horizontal shift register 2012, the horizontal switches are turned on in turn, and under the action of the pulses generated by the vertical shift register 2013, the vertical switches are turned on, so that the reference voltage (bias) is applied to the photodiodes of the pixel units in turn. pressure).
  • the diode receiving the reflected light generates carriers to discharge the junction capacitance, which is the accumulation process of the signal during the integration period, and the above-mentioned process of turning on the bias voltage is also the process of signal readout.
  • the magnitude of the formed electrical signal is proportional to the intensity of the light received on the pixel unit. That is, the stronger the light, the greater the electrical signal; the weaker the light, the smaller the electrical signal.
  • the vertical shift register 2013 can scan the photosensitive element array 2011 progressively or interlaced.
  • other digital signal processing circuits such as automatic exposure control circuit, non-uniform compensation circuit, white balance processing circuit, black level control circuit, gamma Ma correction circuit, etc.
  • the backlight module includes a reflection sheet 1011 , a light guide plate 1012 located on the reflection sheet 1011 , and a light guide plate 1012 located on the reflection sheet 1011 .
  • the optical film set 1014 includes a diffuser (not shown in the figure), a prism sheet (not shown in the figure) and a reflective polarized brightness enhancement film (not shown in the figure).
  • the main function of the reflection sheet 1011 is to reflect back the light leaked from the light guide plate 1012, so as to improve the utilization rate of the light source.
  • the main function of the light guide plate 1012 is to guide the direction of light, that is, to convert the light incident horizontally from the second light source 1013 into the light emitted vertically.
  • the main function of the diffuser (not shown in the figure) is to further soften and diffuse the vertically emitted light and enhance the upward brightness of the light to make the vertically emitted light more uniform.
  • the main function of the prism sheet (not shown in the figure) is to condense the incident light from the diffuser sheet to improve the front brightness.
  • the main function of the reflective polarized brightness enhancement film (not shown in the figure) is to improve the utilization rate of the backlight source, that is, to increase the aperture ratio of the display device.
  • the optical film set 1014 includes a diffuser (not shown in the figure), a prism sheet (not shown in the figure) and a reflective polarized brightness enhancement film (not shown in the figure).
  • the main function of the reflection sheet 1011 is to reflect the light reflected back from the diffuser plate 1016, so as to improve the utilization rate of the light source.
  • the main function of the diffuser plate 1016 is to soften the third light source 1015 (point light source) into a surface light source, and mask the influence of lamp shadows and pillar shadows.
  • the main function of the diffuser (not shown in the figure) is to further soften and diffuse the surface light source and enhance the upward brightness of the light, so that the surface light source is more uniform.
  • the main function of the prism sheet (not shown in the figure) is to condense the incident light from the diffuser sheet to improve the front brightness.
  • the main function of the reflective polarized brightness enhancement film (not shown in the figure) is to improve the utilization rate of the backlight source, that is, to increase the aperture ratio of the display device.
  • the display device includes a control module 110, a backlight module 101, a display panel 102 located on the backlight module 101, a touch panel 109 located on the display panel 102, and a display panel 109 located on the display panel 102.
  • the touch panel 109 if the touch panel 109 detects that the display device is touched, the touch panel 109 sends a touch signal to notify the control module 110 to perform touch pattern recognition;
  • control module 110 controls the first light source 105 to emit outgoing light
  • the transparent optical sensor layer 104 receives the reflected light after the outgoing light is reflected by the touch object and transmits the sensing signal to the control module 110 for the fingerprint image recognition;
  • control module 110 controls the first light source 105 to turn off after completing the fingerprint image identification.
  • the display device further includes a flexible circuit board 111, one end of the flexible circuit board 111 is attached to one side of the control module 110 and is electrically connected to the control module 110, and the other end is respectively connected to the first
  • the light source 105 , the transparent optical sensor layer 104 and the display panel 102 are electrically connected.
  • the touch panel 109 is also electrically connected to the control module 110 (not shown in the figure).
  • the control module 110 is attached to one side of the backlight module 101 .
  • a transparent optical sensor layer 104 is arranged between the backlight module 101 and the display panel 102, and a first light source 105 is arranged under the cover plate 103.
  • the emitted light of the first light source 105 and the reflection formed by the touching object The light does not need to be consumed by the backlight module 101, and the signal is clearer and stronger.
  • the transparent optical sensor layer 104 can quickly and accurately perform full-screen fingerprint recognition without affecting the structure and brightness of the backlight module, and the process is simple.
  • an optical adhesive layer 107 is disposed between the transparent optical sensor layer 104 and the display panel 102 . That is, the display panel 102 is connected to the transparent optical sensor layer 104 through the optical adhesive layer 107. Specifically, the optical adhesive layer 107 may be formed on the bottom of the display panel 102 first, and then the transparent optical sensor may be The upper surface of the layer 104 is attached to the other side of the optical adhesive layer 107, and then cured; or the optical adhesive layer 107 is first formed on the upper surface of the transparent optical sensor layer 104, and then the display The bottom of the panel 102 is attached to the upper surface of the optical adhesive layer 107, and is finally cured.
  • the display device further includes a back frame 108 , and the control module 110 is disposed on the back frame 108 .
  • the back frame 108 may be an iron frame or a rubber-iron composite frame.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

一种显示装置及其指纹识别方法。所述显示装置包括背光模组(101)、位于背光模组(101)之上的显示面板(102)以及位于显示面板(102)之上的盖板(103)；其中，背光模组(101)与显示面板(102)之间设置有透明光学传感器层(104)，盖板(103)面向显示面板(102)的一侧设置有第一光源(105)。

Description

一种显示装置及其指纹识别方法 技术领域
本申请涉及显示技术领域，尤其涉及一种显示装置及其指纹识别方法。
 背景技术
液晶显示面板作为目前应用最广泛的显示屏，其价格和综合性能是它的优势，但由于其自身不能发光，因此需要设置背光模组来提供背光，若将指纹识别模块设于背光模组下方而使用背光模组的光源来提供指纹识别所需的光源，因为背光模组的成像性较差，且背光源也无法满足指纹识别对光线的要求，导致无法实现屏下指纹识别，导致用户体验较差。故，有必要改善这一缺陷。
 技术问题
本申请提供一种显示装置及其指纹识别方法，用于解决现有技术的显示装置无法实现屏下指纹识别的技术问题。
 技术解决方案
本申请实施例提供一种显示装置，包括背光模组、位于所述背光模组之上的显示面板以及位于所述显示面板之上的盖板。其中，所述背光模组与所述显示面板之间设置有透明光学传感器层。所述盖板面向所述显示面板的一侧设置有第一光源。
在本申请实施例提供的显示装置中，所述第一光源与所述显示面板同层设置。
在本申请实施例提供的显示装置中，所述第一光源为发光二极管。
在本申请实施例提供的显示装置中，所述透明光学传感器层由多个互补金属氧化物半导体传感器构成。
在本申请实施例提供的显示装置中，所述互补金属氧化物半导体传感器包括图像采集单元和信号处理单元。
在本申请实施例提供的显示装置中，所述透明光学传感器层与所述背光模组之间设置有绝缘层。
在本申请实施例提供的显示装置中，所述透明光学传感器层与所述显示面板之间设置有光学胶层。
在本申请实施例提供的显示装置中，所述背光模组包括反射片、位于所述反射片之上的导光板、位于所述导光板一侧的第二光源以及位于所述导光板之上的光学膜片组。
在本申请实施例提供的显示装置中，所述光学膜片组包括扩散片、棱镜片以及反射型偏光增亮膜。
在本申请实施例提供的显示装置中，所述背光模组包括反射片、位于所述反射片之上的第三光源、位于所述第三光源之上的扩散板以及位于所述扩散板之上的光学膜片组。
在本申请实施例提供的显示装置中，所述光学膜片组包括扩散片、棱镜片以及反射型偏光增亮膜。
本申请实施例还提供一种显示装置的指纹识别方法，包括步骤：提供一显示装置，所述显示装置包括控制模块、背光模组、位于所述背光模组之上的显示面板、位于所述显示面板之上的触摸板以及位于所述触摸板之上的盖板，其中，所述背光模组与所述显示面板之间设置有透明光学传感器层，所述盖板面向所述显示面板的一侧设置有第一光源；若所述触摸板侦测到所述显示装置被触摸时，所述触摸板发出触摸讯号通知所述控制模块进行触摸态样识别；若所述触摸态样识别结果判定需执行指纹图像识别，则所述控制模块控制所述第一光源发射出射光；所述透明光学传感器层接收所述出射光经触摸物体反射后的反射光并将传感讯号传递至所述控制模块进行所述指纹图像识别；以及所述控制模块于完成所述指纹图像识别后，控制所述第一光源关闭。
在本申请实施例提供的显示装置的指纹识别方法中，所述第一光源与所述显示面板同层设置。
在本申请实施例提供的显示装置的指纹识别方法中，所述第一光源为发光二极管。
在本申请实施例提供的显示装置的指纹识别方法中，所述透明光学传感器层由多个互补金属氧化物半导体传感器构成。
在本申请实施例提供的显示装置的指纹识别方法中，所述互补金属氧化物半导体传感器包括图像采集单元和信号处理单元。
在本申请实施例提供的显示装置的指纹识别方法中，所述透明光学传感器层与所述背光模组之间设置有绝缘层。
在本申请实施例提供的显示装置的指纹识别方法中，所述透明光学传感器层与所述显示面板之间设置有光学胶层。
在本申请实施例提供的显示装置的指纹识别方法中，所述背光模组包括反射片、位于所述反射片之上的导光板、位于所述导光板一侧的第二光源以及位于所述导光板之上的光学膜片组。
在本申请实施例提供的显示装置的指纹识别方法中，所述背光模组包括反射片、位于所述反射片之上的第三光源、位于所述第三光源之上的扩散板以及位于所述扩散板之上的光学膜片组。
 有益效果
本申请提供的一种显示装置，通过在背光模组与显示面板之间设置透明光学传感器层，在盖板下方设置第一光源，所述第一光源的出射光和经过手指形成的反射光无需经过背光模组的消耗，所述透明光学传感器层能快速而精确进行全屏指纹识别，且不影响背光模组的结构和亮度，工艺简单。
 附图说明
图1是本申请实施例提供的显示装置的基本结构示意图。
图2是本申请实施例提供的互补金属氧化物半导体传感器的功能框图。
图3是本申请实施例提供的互补金属氧化物半导体传感器的结构框图。
图4是本申请实施例提供的背光模组的基本结构示意图。
图5是本申请实施例提供的另一背光模组的基本结构示意图。
图6是本申请实施例提供的显示装置的指纹识别方法流程图。
图7是本申请实施例提供的另一显示装置的基本结构示意图。
 本发明的实施方式
为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本申请进一步详细说明。在附图中，为了清晰及便于理解和描述，附图中绘示的组件的尺寸和厚度并未按照比例。
如图1所示，为本申请实施例提供的显示装置的基本结构示意图，所述显示装置包括背光模组101、位于所述背光模组101之上的显示面板102以及位于所述显示面板102之上的盖板103；其中，所述背光模组101与所述显示面板102之间设置有透明光学传感器层104，所述盖板103面向所述显示面板102的一侧设置有第一光源105。
需要说明的是，所述第一光源105是用于为指纹识别提供出射光，当用户使用手指触摸显示装置时，所述第一光源105形成的出射光瞬间辐射至整个盖板区域，所述出射光经过所述手指后形成反射光，所述反射光传播至所述透明光学传感器层104，形成指纹图像，从而实现全屏指纹识别。本申请实施例通过在背光模组101与显示面板102之间设置透明光学传感器层104，在盖板103下方设置第一光源105，所述第一光源105的出射光和经过手指形成的反射光无需经过背光模组101的消耗，所述透明光学传感器层104能快速而精确进行全屏指纹识别，且不影响背光模组101的结构和亮度，工艺简单。
具体地，当手指按压在盖板103的表面时，手指上的脊线与所述盖板103的表面接触，谷线不与所述盖板103的表面接触，因此，照射在指纹脊线所接触部分的所述盖板103的表面的光线被漫反射，而照射在指纹谷线所对应的所述盖板103的表面的光线被全反射，从而在由所述透明光学传感器层104采集的指纹图像中，对应指纹脊线的部分颜色较深，对应指纹谷线的部分颜色较浅。
在一种实施例中，所述第一光源105与所述显示面板102同层设置。如图1所示，所述第一光源105设置在所述显示面板102的左侧，而背光模组101设置在显示面板102的下侧，因此所述第一光源105距离所述盖板103更近，当进行指纹识别时，所述第一光源105形成的出射光能快速覆盖所述盖板103的表面，配合设置于显示面板102与背光模组101之间的透明光学传感器层104，可实现全屏的指纹识别。解决了背光模组的透光性差，且背光源无法满足指纹识别对光线的要求，导致无法进行指纹识别的技术问题，同时也无需对背光模组和显示面板的结构进行改变，制作工艺也比较简单。
在一种实施例中，所述第一光源105为发光二极管。发光二极管的发光效率高且成本低廉，使用时可以将其固定在显示装置的胶框上。在其他实施例中，所述第一光源105的放置方式为倾斜放置，倾斜角度与水平方向呈一定夹角，具体情况视发光距离以及发光范围满足辐射至整个盖板区域而定，本申请不限于此。
在一种实施例中，所述透明光学传感器层104由多个互补金属氧化物半导体传感器构成。所述互补金属氧化物半导体传感器是利用光敏二极管进行光电转换，并将采集的图像(电信号，即模拟信号)转换为数字信号输出。
在一种实施例中，所述透明光学传感器层104与所述背光模组101之间设置有绝缘层106。具体地，所述绝缘层106的材料为聚对苯二甲酸乙二醇酯，具有良好的电绝缘性，且透明度高，可阻挡紫外线。
在一种实施例中，所述透明光学传感器层104与所述显示面板102之间设置有光学胶层107。即所述显示面板102通过所述光学胶层107与所述透明光学传感器层104相连，具体地，可以先将所述光学胶层107形成于显示面板102的底部，然后将所述透明光学传感器层104的上表面贴附在所述光学胶层107的另一侧，然后进行固化；或者先将所述光学胶层107形成于所述透明光学传感器层104的上表面，然后将所述显示面板102的底部与所述光学胶层107的上表面贴合，最后再进行固化。
在一种实施例中，所述显示装置还包括背框108，所述背光模组101设置于所述背框108之上。其中，所述背框108可以为铁框、或者胶铁复合框。
如图2所示，为本申请实施例提供的互补金属氧化物半导体传感器的功能框图，所述互补金属氧化物半导体传感器包括图像采集单元201和信号处理单元202。其中，所述图像采集单元201用于采集用户的指纹图像，将光信号转换为电信号，所述信号处理单元202是用于对所述图像采集单元201采集到的指纹图像进行处理，将电信号转化为数字信号，然后放大，进行输出。
如图3所示，为本申请实施例提供的互补金属氧化物半导体传感器的结构框图，所述互补金属氧化物半导体传感器由光敏元阵列2011、水平移位寄存器2012、垂直移位寄存器2013、控制电路2021、时序电路2022、模/数转换器2023以及输出放大器2024组成，这几部分通常都被集成在同一块硅片上。其工作过程一般可分为复位、光电转换、积分以及读出。
在一种实施例中，当第一光源105(如图1)形成的出射光经过手指后形成反射光，所述反射光传播至透明光学传感器层104(如图1)，其中，所述光敏元阵列2011接收到所述反射光，所述光敏元阵列2011是一个二维的像素阵列，每一个像素单元都由光敏二极管和起开关作用的MOS(Metal-Oxide-Semiconductor，金属-氧化物-半导体)晶体管组成，每个像素单元中的光敏二极管将其阵列表面的光强转换为电信号，然后通过控制电路2021控制水平移位寄存器2012和垂直移位寄存器2013选取像素单元，并将像素单元上的电信号读取出来，传输至模/数转换器2023，将电信号转化为数字图像信号，经输出放大器2024放大后输出。
需要说明的是，所述水平移位寄存器2012从左至右依次接通起水平扫描作用的MOS晶体管，也就是寻址列，所述垂直移位寄存器2013依次寻址列阵的各行，即在所述水平移位寄存器2012产生的脉冲作用下依次接通水平开关，在所述垂直移位寄存器2013产生的脉冲作用下接通垂直开关，于是依次给像素单元的光敏二极管加上参考电压(偏压)。
其中，接收到所述反射光的二极管产生载流子，使结电容放电，这就是积分期间信号的积累过程，而上述接通偏压的过程同时也是信号读出过程。
需要说明的是，形成的电信号大小正比于该像素单元上的接收的光照的强弱。即光照越强，电信号越大；光照越弱，电信号越小。
在一种实施例中，所述垂直移位寄存器2013可以对所述光敏元阵列2011逐行扫描也可以隔行扫描。
在一种实施例中，在所述互补金属氧化物半导体传感器上还可以集成其他数字信号处理电路，如自动曝光量控制电路、非均匀补偿电路、白平衡处理电路、黑电平控制电路、伽玛校正电路等。
如图4所示，为本申请实施例提供的背光模组的基本结构示意图，所述背光模组包括反射片1011、位于所述反射片1011之上的导光板1012、位于所述导光板1012一侧的第二光源1013以及位于所述导光板1012之上的光学膜片组1014。
其中，所述光学膜片组1014包括扩散片(图中未示出)、棱镜片(图中未示出)以及反射型偏光增亮膜(图中未示出)。
需要说明的是，所述反射片1011的主要作用是把从所述导光板1012中泄漏出来的光再反射回去，以提高光源的利用率。所述导光板1012的主要作用是引导光线方向，即把所述第二光源1013水平入射的光线转换为垂直出射的光线。所述扩散片(图中未示出)的主要作用是进一步对垂直出射的光线进行柔散化并提升光线向上的亮度，使垂直出射的光线更均匀。所述棱镜片(图中未示出)的主要作用是汇聚所述扩散片中入射来的光线，提高正面亮度。所述反射型偏光增亮膜(图中未示出)的主要作用是提高背光源的利用率，即提高了显示装置的开口率。
如图5所示，为本申请实施例提供的另一背光模组的基本结构示意图，所述背光模组包括反射片1011、位于所述反射片1011之上的多个第三光源1015、位于所述多个第三光源1015之上的扩散板1016以及位于所述扩散板1016之上的光学膜片组1014。
其中，所述光学膜片组1014包括扩散片(图中未示出)、棱镜片(图中未示出)以及反射型偏光增亮膜(图中未示出)。
需要说明的是，所述反射片1011的主要作用是把从所述扩散板1016中反射回来的光再反射回去，以提高光源的利用率。所述扩散板1016的主要作用是把所述第三光源1015(点状光源)柔化为面光源，掩蔽灯影和支柱暗影的影响。所述扩散片(图中未示出)的主要作用是进一步对面光源进行柔散化并提升光线向上的亮度，使面光源更均匀。所述棱镜片(图中未示出)的主要作用是汇聚所述扩散片中入射来的光线，提高正面亮度。所述反射型偏光增亮膜(图中未示出)的主要作用是提高背光源的利用率，即提高了显示装置的开口率。
如图6、图7所示，为本申请实施例提供的显示装置的指纹识别方法流程图和本申请实施例提供的另一显示装置的基本结构示意图，本申请实施例提供的显示装置的指纹识别方法包括步骤：
S601、提供一显示装置，所述显示装置包括控制模块110、背光模组101、位于所述背光模组101之上的显示面板102、位于所述显示面板102之上的触摸板109以及位于所述触摸板109之上的盖板103，其中，所述背光模组101与所述显示面板102之间设置有透明光学传感器层104，所述盖板103面向所述显示面板102的一侧设置有第一光源105；
S602、若所述触摸板109侦测到所述显示装置被触摸时，所述触摸板109发出触摸讯号通知所述控制模块110进行触摸态样识别；
S603、若所述触摸态样识别结果判定需执行指纹图像识别，则所述控制模块110控制所述第一光源105发射出射光；
S604、所述透明光学传感器层104接收所述出射光经触摸物体反射后的反射光并将传感讯号传递至所述控制模块110进行所述指纹图像识别；以及
S605、所述控制模块110于完成所述指纹图像识别后，控制所述第一光源105关闭。
其中，所述显示装置还包括柔性电路板111，所述柔性电路板111一端贴附于所述控制模块110的一侧且与所述控制模块110电性相连，另一端分别与所述第一光源105、所述透明光学传感器层104以及所述显示面板102电性相连。所述触摸板109与所述控制模块110亦有电性相连(图中未示出)。所述控制模块110贴附于所述背光模组101的一侧。
需要说明的是，当用户使用手指(即触摸物体)触摸所述盖板103时，所述第一光源105形成的出射光瞬间辐射至整个盖板区域，所述出射光经过触摸物体后形成反射光，所述反射光传播至所述透明光学传感器层104，形成指纹图像，从而实现全屏指纹识别。本申请实施例通过在背光模组101与显示面板102之间设置透明光学传感器层104，在盖板103下方设置第一光源105，所述第一光源105的出射光和经过触摸物体形成的反射光无需经过背光模组101的消耗，信号更加清晰强大，所述透明光学传感器层104能快速而精确进行全屏指纹识别，且不影响背光模组的结构和亮度，工艺简单。
在一种实施例中，所述透明光学传感器层104与所述背光模组101之间设置有绝缘层106。具体地，所述绝缘层106的材料为聚对苯二甲酸乙二醇酯，具有良好的电绝缘性，且透明度高，可阻挡紫外线。
在一种实施例中，所述透明光学传感器层104与所述显示面板102之间设置有光学胶层107。即所述显示面板102通过所述光学胶层107与所述透明光学传感器层104相连，具体地，可以先将所述光学胶层107形成于显示面板102的底部，然后将所述透明光学传感器层104的上表面贴附在所述光学胶层107的另一侧，然后进行固化；或者先将所述光学胶层107形成于所述透明光学传感器层104的上表面，然后将所述显示面板102的底部与所述光学胶层107的上表面贴合，最后再进行固化。
在一种实施例中，所述显示装置还包括背框108，所述控制模块110设置于所述背框108之上。其中，所述背框108可以为铁框、或者胶铁复合框。
综上所述，本申请实施例提供的一种显示装置，通过在背光模组与显示面板之间设置透明光学传感器层，在盖板下方设置第一光源，所述第一光源的出射光和经过手指形成的反射光无需经过背光模组的消耗，所述透明光学传感器层能快速而精确进行全屏指纹识别，且不影响背光模组的结构和亮度，工艺简单，解决了现有技术的显示装置无法实现屏下指纹识别的技术问题。
可以理解的是，对本领域普通技术人员来说，可以根据本申请的技术方案及其发明构思加以等同替换或改变，而所有这些替换或改变都应属于本申请所附的权利要求的保护范围。

Claims (20)

  1. 一种显示装置，其包括背光模组、位于所述背光模组之上的显示面板以及位于所述显示面板之上的盖板；
    其中，所述背光模组与所述显示面板之间设置有透明光学传感器层，所述盖板面向所述显示面板的一侧设置有第一光源。
  2. 如权利要求1所述的显示装置，其中，所述第一光源与所述显示面板同层设置。
  3. 如权利要求2所述的显示装置，其中，所述第一光源为发光二极管。
  4. 如权利要求1所述的显示装置，其中，所述透明光学传感器层由多个互补金属氧化物半导体传感器构成。
  5. 如权利要求4所述的显示装置，其中，所述互补金属氧化物半导体传感器包括图像采集单元和信号处理单元。
  6. 如权利要求1所述的显示装置，其中，所述透明光学传感器层与所述背光模组之间设置有绝缘层。
  7. 如权利要求1所述的显示装置，其中，所述透明光学传感器层与所述显示面板之间设置有光学胶层。
  8. 如权利要求1所述的显示装置，其中，所述背光模组包括反射片、位于所述反射片之上的导光板、位于所述导光板一侧的第二光源以及位于所述导光板之上的光学膜片组。
  9. 如权利要求8所述的显示装置，其中，所述光学膜片组包括扩散片、棱镜片以及反射型偏光增亮膜。
  10. 如权利要求1所述的显示装置，其中，所述背光模组包括反射片、位于所述反射片之上的第三光源、位于所述第三光源之上的扩散板以及位于所述扩散板之上的光学膜片组。
  11. 如权利要求10所述的显示装置，其中，所述光学膜片组包括扩散片、棱镜片以及反射型偏光增亮膜。
  12. 一种显示装置的指纹识别方法，其包括步骤：
    提供一显示装置，所述显示装置包括控制模块、背光模组、位于所述背光模组之上的显示面板、位于所述显示面板之上的触摸板以及位于所述触摸板之上的盖板，其中，所述背光模组与所述显示面板之间设置有透明光学传感器层，所述盖板面向所述显示面板的一侧设置有第一光源；
    若所述触摸板侦测到所述显示装置被触摸时，所述触摸板发出触摸讯号通知所述控制模块进行触摸态样识别；
    若所述触摸态样识别结果判定需执行指纹图像识别，则所述控制模块控制所述第一光源发射出射光；
    所述透明光学传感器层接收所述出射光经触摸物体反射后的反射光并将传感讯号传递至所述控制模块进行所述指纹图像识别；以及
    所述控制模块于完成所述指纹图像识别后，控制所述第一光源关闭。
  13. 如权利要求12所述的显示装置的指纹识别方法，其中，所述第一光源与所述显示面板同层设置。
  14. 如权利要求13所述的显示装置的指纹识别方法，其中，所述第一光源为发光二极管。
  15. 如权利要求12所述的显示装置的指纹识别方法，其中，所述透明光学传感器层由多个互补金属氧化物半导体传感器构成。
  16. 如权利要求15所述的显示装置的指纹识别方法，其中，所述互补金属氧化物半导体传感器包括图像采集单元和信号处理单元。
  17. 如权利要求12所述的显示装置的指纹识别方法，其中，所述透明光学传感器层与所述背光模组之间设置有绝缘层。
  18. 如权利要求12所述的显示装置的指纹识别方法，其中，所述透明光学传感器层与所述显示面板之间设置有光学胶层。
  19. 如权利要求12所述的显示装置的指纹识别方法，其中，所述背光模组包括反射片、位于所述反射片之上的导光板、位于所述导光板一侧的第二光源以及位于所述导光板之上的光学膜片组。
  20. 如权利要求12所述的显示装置的指纹识别方法，其中，所述背光模组包括反射片、位于所述反射片之上的第三光源、位于所述第三光源之上的扩散板以及位于所述扩散板之上的光学膜片组。
PCT/CN2020/125036 2020-10-09 2020-10-30 一种显示装置及其指纹识别方法 Ceased WO2022073265A1 (zh)

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