WO2020124792A1 - 一种指纹识别显示面板及指纹识别方法 - Google Patents

一种指纹识别显示面板及指纹识别方法 Download PDF

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Publication number
WO2020124792A1
WO2020124792A1 PCT/CN2019/076801 CN2019076801W WO2020124792A1 WO 2020124792 A1 WO2020124792 A1 WO 2020124792A1 CN 2019076801 W CN2019076801 W CN 2019076801W WO 2020124792 A1 WO2020124792 A1 WO 2020124792A1
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Prior art keywords
layer
light
display panel
finger
sensing
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PCT/CN2019/076801
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English (en)
French (fr)
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朱其文
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武汉华星光电半导体显示技术有限公司
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Priority to US16/472,375 priority Critical patent/US11302111B2/en
Publication of WO2020124792A1 publication Critical patent/WO2020124792A1/zh

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Classifications

    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G06F3/041661—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors

Definitions

  • the invention relates to the field of display technology, and in particular to a display panel with a built-in fingerprint recognition sensor and a fingerprint recognition method.
  • the fingerprint recognition function has gradually become the standard for smart terminals.
  • the location of the fingerprint recognition device on the terminal and the convenience of use have also attracted more and more attention.
  • the fingerprint recognition function has been integrated into the display area to enhance the user experience and become the industry’s aims.
  • Optical fingerprint recognition mainly uses the principle of light refraction and reflection.
  • the finger is placed on the optical lens and the finger is illuminated by the built-in light source, the light is emitted from the bottom to the optical lens and is emitted through the optical lens.
  • the emitted light is fingerprinted on the surface of the finger
  • the angle of refraction on the uneven lines and the brightness of the reflected light will be different. It is projected on the charge-coupled device with an optical lens to form a ridge line (a ridge line with a certain width and direction in the fingerprint image) that is black and a valley line (the concave portion between the ridge lines) that is white.
  • Multi-gray fingerprint image processed by fingerprint device algorithm. Then compare the acquired multi-grayscale fingerprint images with the database to see if they are consistent, so as to complete the identification.
  • OLED Organic Light Emitting Diode, organic light-emitting diode
  • display technology refers to the use of organic semiconductor materials and light-emitting materials driven by an electric field, through carrier injection and recombination led to light-emitting diodes.
  • OLED display devices have many advantages such as self-luminous, low driving voltage, high luminous efficiency, short response time, high clarity and contrast, nearly 180° viewing angle, wide temperature range, flexible display and large-area full-color display. The industry is recognized as the most promising display device.
  • a common fingerprint sampling method is to install a fingerprint recognition element on the smart terminal.
  • the fingerprint recognition element originally set on the front border of the smartphone is now gradually changed to the back of the phone. It is beneficial to realize a frame display panel with narrow sides.
  • the finger needs to be placed at the position of the fingerprint recognition element to perform fingerprint recognition. Therefore, the user needs to place the finger at a specific position during verification, which is less flexible in application.
  • the present invention provides a display panel and fingerprint identification method for fingerprint identification and OLED display technology. Compared with the existing display device with fingerprint identification function, there is no need to provide additional space for a fingerprint identification sensor, which is displayed on the display panel.
  • the fingerprint recognition function can be realized within the area.
  • the invention provides a fingerprint identification display panel including a flexible substrate, a light sensing application layer, a thin film transistor layer, an organic light emitting diode layer, and a thin film packaging layer.
  • the light sensing layer is arranged on the flexible substrate, and operates with high sensitivity or low sensitivity according to the application scene of the display panel.
  • the thin film transistor layer is disposed on the light sensing layer.
  • the organic light emitting diode layer is disposed on the thin film transistor layer, and generates light according to the driving signal of the thin film transistor layer.
  • the thin-film encapsulation layer is provided on the organic light-emitting diode layer to protect the organic light-emitting diode layer, wherein when a user places a finger on the thin-film encapsulation layer, the light generated by the organic light-emitting diode layer will Reflect to the light sensing layer.
  • the light-sensing application layer detects the texture valley line and the ridge line of the user's finger.
  • the light-sensing layer detects the position of the user's finger.
  • the invention also provides a fingerprint identification method, which is used for a display panel having a light-sensing application layer, an organic light-emitting diode layer and a thin film encapsulation layer.
  • the fingerprint identification method includes step one: it is determined that the application scene of the display panel needs to identify a fingerprint image or an identification finger position.
  • Step 2 When the application scene of the display panel needs to recognize the fingerprint image, set the light sensing layer to high sensitivity, and when the application scene of the display panel needs to recognize the position of the finger, transfer the light The sensing layer is set to low sensitivity.
  • Step 3 When the optical sensing layer is set to high sensitivity, the optical sensing layer recognizes the fingerprint image placed on the display panel, and when the optical sensing layer is set to low sensitivity, the light The sensing layer recognizes the position of the finger placed on the display panel.
  • the light generated by the organic light-emitting diode layer penetrates the thin-film encapsulation layer and reflects the light to the light-sensing application layer.
  • the sensing layer recognizes the fingerprint valley line and the ridge line of the user's finger according to the intensity of the reflected light.
  • the light generated by the organic light-emitting diode layer penetrates the thin-film encapsulation layer and reflects the light to the light-sensing application layer.
  • the sensing layer recognizes the position of the user's finger according to the reflected light.
  • the invention also provides a fingerprint identification method, which is used for a display panel having a light-sensing application layer, an organic light-emitting diode layer and a thin film encapsulation layer.
  • the fingerprint identification method includes step one: detecting whether a user places a finger on the thin film encapsulation layer, and when it is detected that the user places a finger on the thin film encapsulation layer, determine the application scene needs of the display panel Identify fingerprint images or identify finger positions.
  • Step 2 When the application scene of the display panel needs to recognize the fingerprint image, set the light sensing layer to high sensitivity, and when the application scene of the display panel needs to recognize the position of the finger, transfer the light The sensing layer is set to low sensitivity.
  • Step 3 When the optical sensing layer is set to high sensitivity, the optical sensing layer recognizes the fingerprint image placed on the display panel, and when the optical sensing layer is set to low sensitivity, the light The sensing layer recognizes the position of the finger placed on the display panel.
  • the light generated by the organic light-emitting diode layer penetrates the thin-film encapsulation layer and reflects the light to the light-sensing application layer.
  • the sensing layer recognizes the fingerprint valley line and the ridge line of the user's finger according to the intensity of the reflected light.
  • the light generated by the organic light-emitting diode layer penetrates the thin-film encapsulation layer and reflects the light to the light-sensing application layer.
  • the sensing layer recognizes the position of the user's finger according to the reflected light.
  • the advantage of the present invention is that, through the fingerprint recognition display panel of the present invention, the sensitivity of the light sensing application layer can be adjusted according to the application scene of the display panel, so that the light sensing application layer can detect the position where the side touch occurs and be placed on the display panel Fingerprint image, so you can achieve the function of fingerprint recognition without additional fingerprint recognition device. .
  • FIG. 1 is a schematic structural diagram of a fingerprint identification display panel of the present invention
  • FIG. 2 is a flow chart of a first embodiment of fingerprint identification of a fingerprint identification display panel of the present invention
  • FIG. 3 is a flowchart of a second embodiment of the fingerprint recognition display panel fingerprint recognition of the present invention.
  • the display panel 10 includes a flexible substrate 11, a light sensing application layer 12, a thin-film transistor (Thin-Film Transistor, TFT) layer 13, and an organic light-emitting diode (Organic Light-Emitting) Diode, OLED) layer 14 and thin film encapsulation (Thin Film Encapsulation, TFE) ⁇ 15 ⁇ 15 layer.
  • TFT Thin-Film Transistor
  • OLED Organic Light-Emitting diode
  • TFE Thin Film Encapsulation
  • the flexible substrate 11 is disposed on a glass substrate (not shown).
  • the flexible substrate 11 may be made of elastic materials such as polyimide (PI), metal, or the like.
  • the light generated by the OLED light-emitting layer will be reflected if it hits an object. Therefore, when the light sensing layer in the OLED display panel receives the reflected light, it will return the detected light intensity. This is to determine whether the touch occurs, as well as the location where the touch occurs and the direction of the touch movement.
  • the feature of the present invention is that the light sensing application layer originally used for detecting touch in the OLED display panel is used to increase the sensitivity of the light sensing application layer, so that the light sensing application layer recognizes the fingerprint path according to the intensity of the reflected light detected by the transmission
  • the valley line and the ridge line are used to generate the image of the fingerprint path, so as to achieve the purpose of fingerprint recognition.
  • Step 21 is that the display panel starts to operate.
  • the terminal with the fingerprint recognition display panel of the present invention enables the display panel to display the screen according to the application program or user instruction.
  • the terminal determines whether the application scene displayed on the display panel needs to perform fingerprint recognition, if the application scene requires fingerprint recognition, then step 23 is performed, and if the application scene does not require fingerprint recognition, then step 24 is performed.
  • Step 23 is that when the application scenario requires fingerprint recognition, the terminal increases the sensitivity of the light-sensing application layer, so that the light-sensing application layer operates with high flexibility, so the light-sensing application layer can detect the reflection of the OLED light-emitting layer after it touches the fingerprint path Light intensity, the light sensing layer should identify the valley line and the ridge line of the fingerprint path according to the detected reflected light intensity. The terminal then recognizes the image of the fingerprint path according to the light intensity returned by the light sensing layer on the display panel, Based on the application scenario and the fingerprint database stored in the terminal, it is determined whether the user has permission to execute the application program.
  • Step 24 is that when the application scenario does not require fingerprint recognition, the terminal enables the light sensing application layer to operate with low flexibility.
  • the light sensing application layer only needs to detect whether the reflected light is received, and does not need to detect the intensity of the reflected light.
  • the terminal determines the position where the finger touches or the direction in which the touch gesture moves according to the feedback result from the light sensing layer on the display panel, so that the user can control the terminal according to the touch gesture.
  • the terminal continuously determines the application scenario of the display panel, it will increase the burden on the processor. For example, when the display panel is playing video or is in standby, the user does not have any need to identify the user's fingerprint at this time, and the terminal does not need to determine the application scenario of the display panel. Or when the application scenario needs to identify the user's fingerprint, but the terminal is in an idle state or the user has no action, at this time, the optical sensor should be continuously improved to operate with high sensitivity to increase energy consumption.
  • the present invention has a second embodiment.
  • 3 is a flowchart of a second embodiment of fingerprint recognition of a fingerprint identification display panel of the present invention.
  • Step 31 is the operation of the display panel.
  • the terminal with the fingerprint identification display panel of the present invention enables the display panel to be displayed according to application programs or user instructions. Screen.
  • step 32 it is first determined whether a touch response is detected on the display panel, that is, whether the light sensing application layer receives reflected light, and when the light sensing application layer receives When the light is reflected, it means that the user is operating the terminal.
  • step 34 is that when the application scenario requires fingerprint recognition, the terminal increases the sensitivity of the light sensing application layer, so that the light sensing application layer operates with high flexibility. Therefore, the light sensing application layer can recognize the image of the hand fingerprint road, and then store it in The fingerprint database of the terminal to determine whether the user has permission to execute the application.
  • Step 24 When the application scenario does not require fingerprint recognition, the terminal causes the light sensing application layer to operate with low flexibility, so that the terminal can determine the position where the finger touches or touches according to the feedback result from the light sensing application layer on the display panel The direction in which the gesture moves allows the user to control the terminal according to the touch gesture.
  • the second example will judge the application scene of the display panel when it is placed on the display panel with the finger, that is, when the screen is idle, standby, playing video, etc. without gesture control, the terminal does not need to judge the scene of the display panel, so There is no need to adjust the sensitivity of the light sensing layer. Therefore, the second embodiment of the fingerprint recognition display panel of the present invention can save energy consumption compared to the first embodiment, and can also enable the light-transmitting sensing layer to adjust the sensitivity according to the application scene of the display panel.
  • the fingerprint identification display panel and the fingerprint identification method of the present invention enable the display panel to perform fingerprint identification without additional fingerprint identification devices, and realize the fingerprint identification function in the display area, so the user can use any area of the display panel Fingerprint recognition is performed on the block without placing fingers in the fingerprint recognition block, which improves the user experience.
  • Fingerprint recognition is performed on the block without placing fingers in the fingerprint recognition block, which improves the user experience.

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Abstract

一种指纹识别显示面板包括柔性基板、光传感应层、薄膜晶体管层、有机发光二极管层以及薄膜封装层。所述光传感应层设置于所述柔性基板上，依据应用场景以高灵敏度或低灵敏度运作。所述有机发光二极管层设置于所述光传感应层与所述薄膜晶体管层之间，依据所述薄膜晶体管层的驱动信号产生光线。所述薄膜封装层设置于所述有机发光二极管层上，当用户将手指放置于所述薄膜封装层上时，所述有机发光二极管层产生的光线会反射至所述光传感应层。通过本发明的指纹识别显示面板，不需额外的指纹识别器件即可达到指纹识别的功能。

Description

一种指纹识别显示面板及指纹识别方法 技术领域
本发明涉及显示技术领域，尤其是涉及一种具有内置指纹识别传感器的显示面板及指纹识别方法。
 背景技术
随着移动通信技术和智能终端的迅速发展，指纹验证技术的使用人群范围越来越广。目前，指纹识别功能逐渐成为智能终端的标配，指纹识别装置在终端上的位置、使用的便捷性也越来越受关注，将指纹识别功能整合到显示区域，来提升用户体验，成为业界的目标。应用于智能终端的指纹识别目前主要有三种技术：电容式，光学式和超声波式。
光学式指纹识别主要是利用光的折射和反射原理，当手指放在光学镜片上，手指在内置光源照射下，光从底部射向光学镜片，并经光学镜片射出，射出的光线在手指表面指纹凹凸不平的线纹上折射的角度及反射回去的光线明暗就会不一样。用光学镜片将其投射在电荷耦合器件上，进而形成脊线（指纹图像中具有一定宽度和走向的纹线）呈黑色、谷线（纹线之间的凹陷部分）呈白色的数字化的、可被指纹设备算法处理的多灰度指纹图像。然后对比获取的多灰度指纹图像与资料库，看是否一致，从而完成识别。
OLED（Organic Light Emitting Diode，有机发光二极管）显示技术是指利用有机半导体材料和发光材料在电场驱动下，通过载流子注入和复合导致发光的二极管。OLED显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示装置。
 技术问题
常见的指纹取样方法，是在智能终端上设置指纹辨识元件，随着窄框触控显示面板的发展，原本设置于智能手机正面边框上指纹辨识元件，现也渐改为设置于手机背面，以利于实现具有窄边的框显示面板。当指纹辨识元件设置于背面时，手指需放置于指纹辨识元件的位置才能进行指纹辨识，因此造成使用者在验证时需将手指置于特定位置，在应用上较不灵活。
因此，本发明提供一种指纹识别与OLED显示技术的显示面板及指纹识别方法，与现有的具备指纹辨识功能的显示装置相比，不需额外设置指纹辨识传感器的空间，在显示面板的显示区域内的便可实现指纹辨识功能。
 技术解决方案
本发明提供一种指纹识别显示面板包括柔性基板、光传感应层、薄膜晶体管层、有机发光二极管层以及薄膜封装层。所述光传感应层设置于所述柔性基板上，依据显示面板的应用场景以高灵敏度或低灵敏度运作。所述薄膜晶体管层设置于所述光传感应层上。所述有机发光二极管层设置于所述薄膜晶体管层上，依据所述薄膜晶体管层的驱动信号产生光线。所述薄膜封装层设置于所述有机发光二极管层上，用来保护所述有机发光二极管层，其中当用户将手指放置于所述薄膜封装层上时，所述有机发光二极管层产生的光线会反射至所述光传感应层。
较佳地，当所述光传感应层以高灵敏度运作时，所述光传感应层侦测所述用户手指的纹路谷线与脊线。
较佳地，当所述光传感应层以低灵敏度运作时，所述光传感应层侦测所述用户手指的位置。
本发明另提供一种指纹识别方法，用于具有光传感应层、有机发光二极体层及薄膜封装层的显示面板上。所述指纹识别方法包括步骤一：判断所述显示面板的应用场景需要识别指纹图像或识别指位置。步骤二：当所述显示面板的应用场景需要识别所述指纹图像时，将所述光传感应层设置为高灵敏度，当所述显示面板的应用场景需要识别手指位置时，将所述光传感应层设置为低灵敏度。步骤三：当所述光传感应层设置为高灵敏度时，所述光传感应层识别放置于所述显示面板上的指纹图像，当所述光传感应层设置为低灵敏度时，所述光传感应层识别放置于所述显示面板上的手指位置。
较佳地，当用户将手指放置于所述薄膜封装层上时，所述有机发光二极体层产生的光线穿透所述薄膜封装层后反射光线至所述光传感应层，所述光传感应层依据所述反射光线的强度识别所述用户手指的指纹谷线与脊线。
较佳地，当用户将手指放置于所述薄膜封装层上时，所述有机发光二极体层产生的光线穿透所述薄膜封装层后反射光线至所述光传感应层，所述光传感应层依据所述反射光线识别所述用户手指的位置。
本发明另提供一种指纹识别方法，用于具有光传感应层、有机发光二极体层及薄膜封装层的显示面板上。所述指纹识别方法包括步骤一：侦测用户是否将手指放置于所述薄膜封装层上，当侦测到用户将手指放置于所述薄膜封装层上时，判断所述显示面板的应用场景需要识别指纹图像或识别手指位置。步骤二：当所述显示面板的应用场景需要识别所述指纹图像时，将所述光传感应层设置为高灵敏度，当所述显示面板的应用场景需要识别手指位置时，将所述光传感应层设置为低灵敏度。步骤三：当所述光传感应层设置为高灵敏度时，所述光传感应层识别放置于所述显示面板上的指纹图像，当所述光传感应层设置为低灵敏度时，所述光传感应层识别放置于所述显示面板上的手指位置。
较佳地，当用户将手指放置于所述薄膜封装层上时，所述有机发光二极体层产生的光线穿透所述薄膜封装层后反射光线至所述光传感应层，所述光传感应层依据所述反射光线的强度识别所述用户手指的指纹谷线与脊线。
较佳地，当用户将手指放置于所述薄膜封装层上时，所述有机发光二极体层产生的光线穿透所述薄膜封装层后反射光线至所述光传感应层，所述光传感应层依据所述反射光线识别所述用户手指的位置。
 有益效果
本发明的优点在于，通过本发明的指纹识别显示面板，可以依据显示面板的应用场景调整光传感应层的灵敏度，使得光传感应层可以时间侦侧触控发生的位置以及放置于显示面板上的指纹图像，因此不需额外的指纹识别器件即可达到指纹识别的功能。。
 附图说明
图1，本发明指纹识别显示面板的结构示意图；
图2，本发明指纹识别显示面板指纹辨识第一实施例的流程图；
图3，本发明指纹识别显示面板指纹辨识第二实施例的流程图。
 本发明的最佳实施方式
下面结合附图对本发明提供的指纹识别显示面板及指纹识别显方法做详细说明。显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，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，都属于本发明保护的范围。
参考图1，具有光学式指纹识别功能的显示面板的结构示意图。显示面板10包括柔性基板11、光传感应层12、薄膜晶体管(Thin-Film Transistor, TFT)层13、有机发光二极管(Organic Light-Emitting Diode, OLED)层14以及薄膜封装(Thin Film Encapsulation, TFE)层15。使用者会将手指放置在TFE层15上以执行触控或是指纹辨识。当用户手指按在显示面板上时，OLED层所产生的光线照射手指纹路16后会漫反射到光传感层12上。其中柔性基板11设置于玻璃基板(未图示)上，柔性基板11可以聚酰亚胺(Polyimide, PI)、金属等具有弹性的材料制成。待柔性基板11制备完成后，再于上方依序制作光传感应层12、TFT层13、OLED层14以及TFE层15。
在现有OLED显示面板中，OLED发光层所产生的光线若碰到物体会反射，因此当OLED显示面板中的光传感应层接收到反射的光线时便回传侦测到的光线强度，藉此来判别触控是否发生，同时判别触控发生的位置以及触控移动的方向。本发明的特点，是利用OLED显示面板中原有用来侦测触控的光传感应层，将光传感应层的灵敏度提高，使得光传感应层依传侦测到的反射光线强度来识别手指纹路的谷线与脊线，以产生手指纹路的图像，藉此达到指纹识别的目的。
请参考图2，图2为本发明指纹识别显示面板的指纹辨识第一实施例的流程图。步骤21为显示面板开始运作，具有本发明指纹识别显示面板的终端，使显示面板依照应用程序或用户指令显示画面。步骤22时，终端判断显示面板所显示的应用场景是否需要执行指纹识别，若应用场景需要指纹识别时则执行步骤23，若应用场景不需要指纹识别时则执行步骤24。步骤23为当应用场景需要指纹识别时，终端提高光传感应层的灵敏度，使光传感应层以高灵度运作，因此光传感应层可以侦测到OLED发光层碰到手指纹路后所反射的光线强度，光传感应层依侦测到的反射光线强度来识别手指纹路的谷线与脊线，终端再依据显示面板上光传感应层所反馈的光线强度，来识别手指纹路的图像，再依据应用场景及存储于终端的指纹数据库，来判别用户是否有权限执行应用程序。步骤24为当应用场景不需要指纹识别时，终端提使光传感应层以低灵度运作，光传感应层只需要侦测是否接收到反射的光线，而不需要侦测反射光线的强度，终端再依据显示面板上光传感应层所反馈的结果，来判别手指碰触的位置或是触控手势移动的方向，使用户可以依据触控手势来操控终端。
然而，若终端持续判断显示面板的应用场景，则会增加处理器的负担。举例来说，当显示面板正在播放视频或待机时，此时用户不会有任何识别用户指纹的需求，则终端也不需判断显示面板的应用场景。或是当应用场景需要识别用户指纹时，然而终端处于闲置状态或是用户没有任何动作，此时持续提高光传感应层以高灵敏度运作而增加能耗。
因此，本发明尚有第二实施例。图3所示为本发明指纹识别显示面板的指纹辨识第二实施例的流程图，步骤31为显示面板开始运作，具有本发明指纹识别显示面板的终端，使显示面板依照应用程序或用户指令显示画面。与第一实施例不同的时，第二实施例在步骤32中会先判别显示面板上是否侦测到触碰反应，也就是光传感应层是否有接收到反射光线，当光传感应层接收到反射光线时，表示用户正在操作终端。接着再执行步骤33时，终端判断显示面板所显示的应用场景是否需要执行指纹识别，若应用场景需要指纹识别时则执行步骤34，若应用场景不需要指纹识别时则执行步骤35。步骤34为当应用场景需要指纹识别时，终端提高光传感应层的灵敏度，使光传感应层以高灵度运作，因此光传感应层可以识别手指纹路的图像，再依据应用场景及存储于终端的指纹数据库，来判别用户是否有权限执行应用程序。步骤24为当应用场景不需要指纹识别时，终端提使光传感应层以低灵度运作，使终端依据显示面板上光传感应层所反馈的结果来判别手指碰触的位置或是触控手势移动的方向，使用户可以依据触控手势来操控终端。
第二实例在侦测到用指手指放置在显示面板上时再会判断显示面板的应用场景，也就是当画面闲置、待机、播放视频等没有手势操控时，终端不需判断显示面板的场景，因此光传感应层也不需调整灵敏度。因而本发明指纹识别显示面板的指纹辨识第二实施例相较于第一实施例更能节省能耗，并且同样可使光传应感层根据显示面板的应用场景来调整灵敏度。
通过本发明所述的指纹识别显示面板与指纹识别方法，使得显示面板不需额外的指纹识别器件便可执行指纹识别，实现了在显示区域内的指纹识别功能，因此用户可以在显示面板任意区块上执行指纹识别，不需将手指放置于指纹辨识区块中，提升了用户体验以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (11)

  1. 一种指纹识别显示面板，包括：
    柔性基板；
    光传感应层，设置于所述柔性基板上，依据应用场景调整所述光传感应层的灵敏度，当所述应用场景需要侦测指纹时，所述光传感应层以高灵敏度运作；
    薄膜晶体管层，设置于所述光传感应层上；
    有机发光二极管层，设置于所述薄膜晶体管层上，依据所述薄膜晶体管层的驱动信号产生光线；以及
    薄膜封装层，设置于所述有机发光二极管层上，用来保护所述有机发光二极管层；
    其中当用户将手指放置于所述指纹识别显示面板上时，所述光传感应层感测经用户手指反射的由所述有机发光二极管层发出的光线进行识别；
    当所述光传感应层以高灵敏度运作时，所述光传感应层侦测所述用户手指的指纹谷线与脊线；
    当所述光传感应层以低灵敏度运作时，所述光传感应层侦测所述用户手指的位置。
  2. 一种指纹识别显示面板，包括：
    柔性基板；
    光传感应层，设置于所述柔性基板上；
    薄膜晶体管层，设置于所述光传感应层上；
    有机发光二极管层，设置于所述薄膜晶体管层上，依据所述薄膜晶体管层的驱动信号产生光线；以及
    薄膜封装层，设置于所述有机发光二极管层上，用来保护所述有机发光二极管层；
    其中当用户将手指放置于所述指纹识别显示面板上时，所述光传感应层感测经用户手指反射的由所述有机发光二极管层发出的光线进行识别。
  3. 根据权利要求2所述的指纹识别显示面板，其中所述指纹识别显示面板依据应用场景调整所述光传感应层的灵敏度，当所述应用场景需要侦测指纹时，所述光传感应层以高灵敏度运作。
  4. 根据权利要求3所述的指纹识别显示面板，当所述光传感应层以高灵敏度运作时，所述光传感应层侦测所述用户手指的指纹谷线与脊线。
  5. 根据权利要求2所述的指纹识别显示面板，其中所述指纹识别显示面板依据应用场景调整所述光传感应层的灵敏度，当所述应用场景需要侦测触控发生的位置时，所述光传感应层以低灵敏度运作。
  6. 根据权利要求5所述的指纹识别显示面板，当所述光传感应层以低灵敏度运作时，所述光传感应层侦测所述用户手指的位置。
  7. 一种指纹识别方法，用于具有光传感应层、有机发光二极体层及薄膜封装层的指纹识别显示面板上，包括：
    步骤一：判断所述显示面板的应用场景需要识别指纹图像或识别指位置；
    步骤二：依据所述显示面板的应用场景调所述光传感应层的灵敏度；
    步骤三：所述有机发光二极体层产生的光线穿透所述薄膜封装层至用户手指后，所述有机发光二极体层产生的光线反射至所述光传感应层，所述光传感应层依据所述反射光线的强度识别所述用户手指当所述光传感应层设置为高灵敏度时，所述光传感应层识别放置于所述显示面板上的指纹图像，当所述光传感应层设置为低灵敏度时，所述光传感应层识别放置于所述显示面板上的手指位置。
  8. 根据权利要求7所述的指纹识别方法，当所述显示面板的应用场景需要识别所述指纹图像时，将所述光传感应层设置为高灵敏度，当所述显示面板的应用场景需要识别手指位置时，将所述光传感应层设置为低灵敏度。
  9. 根据权利要求8所述的指纹识别方法，当所述光传感应层设置为高灵敏度时用户将手指放置于所述显示面板上时，所述光传感应层依据所述反射光线的强度识别所述用户手指的指纹谷线与脊线。
  10. 根据权利要求8所述的指纹识别方法，当所述光传感应层设置为低灵敏度时，所述光传感应层依据所述反射光线识别所述用户手指的位置。
  11. 根据权利要求8所述的指纹识别方法，其中所述步骤一包含侦测用户是否将手指放于所述薄膜封装层上，当侦测到手指放置于所述薄膜封装层上时，判断所述显示面板的应用场景需要识别指纹图像或识别手指位置，当侦测到手指未放置于所述薄膜封装层上时，将所述光传感应层设置为低灵敏度。
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CN106940598A (zh) * 2016-12-20 2017-07-11 上海交通大学 集触控和指纹识别的光学触摸屏
CN109359640A (zh) * 2018-12-21 2019-02-19 武汉华星光电半导体显示技术有限公司 一种指纹识别显示面板及指纹识别方法

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