WO2020207221A1 - 显示面板、指纹识别方法和显示装置 - Google Patents

显示面板、指纹识别方法和显示装置 Download PDF

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Publication number
WO2020207221A1
WO2020207221A1 PCT/CN2020/080134 CN2020080134W WO2020207221A1 WO 2020207221 A1 WO2020207221 A1 WO 2020207221A1 CN 2020080134 W CN2020080134 W CN 2020080134W WO 2020207221 A1 WO2020207221 A1 WO 2020207221A1
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WIPO (PCT)
Prior art keywords
fingerprint
display panel
tested
imaging area
small hole
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PCT/CN2020/080134
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English (en)
French (fr)
Inventor
冯彬峰
刘颖
李奇峰
罗永辉
王超
李飞
赵海瑞
陈禹鹏
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Publication of WO2020207221A1 publication Critical patent/WO2020207221A1/zh

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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1318Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • H10K59/126Shielding, e.g. light-blocking means over the TFTs
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65OLEDs integrated with inorganic image sensors

Definitions

  • This article relates to the field of touch display technology, in particular to a display panel, a fingerprint identification method and a display device.
  • Fingerprints are inherently unique and invariant features of the human body that can be distinguished from them. It consists of ridges and valleys on the surface of the fingertips. The composition details of these ridges and valleys determine the uniqueness of the fingerprint pattern.
  • the display panel with fingerprint recognition function developed therefrom has been used for personal identity verification, increasing the information security of the display device.
  • the existing display panels generally have a fingerprint recognition function.
  • the present application provides a display panel including: a base substrate and a light shielding layer, a light emitting device, and a sensor assembly disposed on the base substrate; the light shielding layer is located on the light emitting device and the sensor assembly between;
  • the light shielding layer includes: a small hole imaging area; the size of the small hole imaging area in the first direction is smaller than the size of the fingerprint to be tested in the first direction, and the small hole imaging area is in the second direction.
  • the size in the direction is larger than the size of the fingerprint to be tested in the second direction; the small hole imaging area is used to image a part of the fingerprint to be tested on the sensor component when the fingerprint to be tested is detected.
  • the light shielding layer is located on a side of the base substrate close to the light emitting device, and the sensor assembly is located on a side of the base substrate away from the light shielding layer.
  • the orthographic projection of the light shielding layer on the base substrate covers the orthographic projection of the light-emitting device on the base substrate.
  • the orthographic projection of the sensor assembly on the base substrate covers the orthographic projection of the aperture imaging area on the base substrate.
  • the length of the small hole imaging area is greater than the width of the fingerprint to be measured, and the width of the small hole imaging area is less than the length of the fingerprint to be measured.
  • the small hole imaging area includes a plurality of openings arranged in an array; the centers of the openings located in the same row or column are on the same straight line.
  • the shape of the opening is circular, and the diameter of each opening is 3 ⁇ m-25 ⁇ m.
  • the distance between adjacent openings is equal.
  • the sensor component includes: an image sensor for acquiring multiple partial fingerprint images of the fingerprint to be tested above the display panel passing through the aperture imaging area;
  • the display panel further includes: a processor
  • the processor is connected to the image sensor, and is used for splicing and combining the received multiple partial fingerprint images to form a complete fingerprint image.
  • the sensor assembly further includes: a pressure sensor
  • the pressure sensor is used to obtain the pressure value applied by the fingerprint to be tested on the display panel
  • the processor is connected to the pressure sensor, and is used for splicing and combining multiple received partial fingerprint images when the pressure value is greater than 0 to form a complete fingerprint image.
  • the display panel further includes: a buffer layer;
  • the buffer layer is arranged on a side of the light shielding layer close to the light emitting device.
  • the first direction is the direction in which the fingerprint to be tested moves relative to the small hole imaging area when the small hole imaging area is used to detect the fingerprint; the second direction is perpendicular to the first One direction.
  • the entire small hole imaging area is detecting the fingerprint to be tested
  • only a part of the fingerprint to be tested can be imaged onto the sensor assembly at the same time.
  • the present application also provides a display device including the above-mentioned display panel.
  • the present application also provides a fingerprint identification method applied to the above-mentioned display panel, and the method includes:
  • the method further includes:
  • the multiple partial fingerprint images received are spliced and combined to form a complete fingerprint image.
  • said splicing and combining multiple received partial fingerprint images to form a complete fingerprint image includes:
  • the received multiple partial fingerprint images are spliced and combined to form a complete fingerprint image.
  • Figure 1 is a side view of a display panel in the related art
  • Figure 2 is a schematic diagram of the distribution of small holes in the related art
  • FIG. 3 is a side view 1 of a display panel provided by at least one embodiment of the application.
  • FIG. 4 is a top view of a light shielding layer provided by at least one embodiment of the application.
  • FIG. 5 is a light path diagram of a display panel provided by at least one embodiment of the application.
  • FIG. 6 is a second side view of the display panel provided by at least one embodiment of the application.
  • the specification may have presented the method and/or process as a specific sequence of steps. However, to the extent that the method or process does not depend on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As those of ordinary skill in the art will understand, other sequence of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation on the claims. In addition, the claims for the method and/or process should not be limited to executing their steps in the written order. Those skilled in the art can easily understand that these orders can be changed and still remain within the spirit and scope of the embodiments of the present application. Inside.
  • the display panel with fingerprint recognition function uses the small holes designed in the image sensor and the display panel to realize fingerprint recognition through the principle of small hole imaging.
  • the inventors have discovered through research that the small holes on the display panel in the related technology have a large distribution area, which causes a large number of pixels that cannot be displayed normally in the display panel, resulting in a poor imaging effect of the display panel.
  • Figure 1 is a side view of a display panel in the related art
  • Figure 2 is a schematic diagram of the distribution of small holes in the related art.
  • the display panel in the related art includes: a light-emitting device 1, a via 2 and a sensor 3. .
  • the principle of small hole imaging is: light travels in a straight line in the same homogeneous medium without being disturbed by gravitational force.
  • different positions of the finger reflect the light emitted by the light-emitting device 1, and the reflected light
  • the sensor 3 reaches different positions of the sensor 3 through the via 2 on the display panel.
  • the sensor 3 obtains a fingerprint image according to the received light, and compares and recognizes the collected fingerprint image with the original fingerprint to determine whether the fingerprint matches to realize unlocking.
  • the display panel in the related art detects fingerprints, the pixels of the display panel corresponding to the via 2 are in a constant light state.
  • the distribution area of vias 2 in the related art covers the fingerprint area, and the area of the distribution area of vias 2 is larger, which makes the number of pixels that cannot be displayed normally when detecting fingerprints, which leads to The imaging effect of the display panel is poor.
  • the distribution area of the via 2 in the related art is relatively large, but the width is relatively narrow, so that the display panel usually needs to provide a position prompt before detecting a fingerprint, which is not conducive to realizing touch.
  • embodiments of the present application provide a display panel, a fingerprint detection method, and a display device, which are specifically described as follows:
  • FIG. 3 is a side view 1 of a display panel provided in an embodiment of the application
  • FIG. 4 is a top view of a light shielding layer provided in an embodiment of the application.
  • the display panel is preferably an OLED display panel.
  • the display panel provided by the embodiment of the present application includes: a base substrate 10 and a light shielding layer 20, a light emitting device 30, and a sensor assembly 40 arranged on the base substrate 10; the light shielding layer 20 is located on the light emitting device Between 30 and sensor assembly 40.
  • the light shielding layer 20 includes a small hole imaging area 21, and the small hole imaging area 21 is used to image a local fingerprint to be tested onto the sensor assembly 40 when the fingerprint to be tested is detected.
  • the light emitting device 30 includes a detection area, and the orthographic projection of the detection area on the base substrate coincides with the orthographic projection of the aperture imaging area on the base substrate. Specifically, in this embodiment, when the fingerprint to be tested is detected, the fingerprint to be tested is placed on the detection area.
  • the base substrate 10 may be a rigid substrate or a flexible substrate, where the rigid substrate may be but not limited to one or more of glass and metal foil; the flexible substrate may be but not limited to poly Ethylene terephthalate, ethylene terephthalate, polyether ether ketone, polystyrene, polycarbonate, polyarylate, polyarylate, polyimide, polyvinyl chloride, One or more of polyethylene and textile fibers.
  • the light shielding layer 20 may be made of metal or non-metal light shielding materials.
  • Metal or black matrix material the embodiment of the present application does not make any limitation on this, and the embodiment of the present application does not specifically limit the thickness of the light-shielding layer, as long as the light-shielding effect can be achieved.
  • the thickness of the light shielding layer 20 in the embodiment of the present application is smaller.
  • no additional preparation process is required to fill the small hole imaging area.
  • the film layer on the side of the light-shielding layer 20 away from the base substrate 10 fills the small hole imaging area without affecting other performance of the display panel.
  • other preparation processes can be additionally provided to fill the small hole imaging area. The choice is made according to the specific situation and is not specifically limited here.
  • the light emitting device 30 specifically includes a thin film transistor, an anode, a light emitting layer, and a cathode.
  • the anode is connected to the drain electrode of the thin film transistor.
  • the light-emitting device 30 has a touch function, and may be self-capacitive or mutual-capacitive, which is not limited in the embodiment of the present application, and is specifically determined according to actual requirements.
  • the orthographic projection of the aperture imaging area 21 on the base substrate 10 is located on the display area AA of the base substrate 10.
  • the width of the small hole imaging area 21 is H, and the small hole imaging area 21 is used to image a local fingerprint with a width equal to the width of the small hole imaging area 21 onto the sensor assembly 40 when the fingerprint to be tested is detected .
  • the small hole imaging area 21 when used to detect the fingerprint to be tested, the fingerprint to be tested slides relative to the small hole imaging area 21 along the first direction indicated by the arrow in FIG. 4;
  • the width refers to the size of the aperture imaging area 21 in the above-mentioned first direction.
  • the size of the small hole imaging area 21 in the second direction perpendicular to the first direction is the length L of the small hole imaging area 21, as shown in FIG. 4.
  • the fingerprint to be tested is divided into a plurality of M partial fingerprints to be tested with a width H, and the M partial fingerprints to be tested are parallel to each other, and the sensor assembly 40
  • a complete fingerprint image is obtained by continuously detecting multiple partial fingerprints to be tested, that is, the fingerprint is scanned and detected when the fingerprint to be tested moves on the display panel.
  • the complete fingerprint image is superimposed based on parallel and equidistant partial fingerprints to be tested.
  • the display panel provided by the embodiment of the application includes: a base substrate and a light-shielding layer, a light-emitting device, and a sensor assembly disposed on the base substrate; the light-shielding layer is located between the light-emitting device and the sensor assembly; the light-shielding layer includes: small hole imaging Area, the small hole imaging area is used to image the partial fingerprint to be detected on the sensor assembly when the fingerprint to be detected is detected.
  • the small hole imaging area on the light-shielding layer in the present application images a local fingerprint to be tested into the sensor assembly, which reduces the distribution area of the small holes in the display panel, and increases the number of normal display pixels in the display panel. Improve the imaging effect of the display panel.
  • the light shielding layer 20 is located on the side of the base substrate 10 close to the light emitting device 30, and the sensor assembly 40 is located on the side of the base substrate 10 away from the light shielding layer 20.
  • the orthographic projection of the sensor assembly 40 on the base substrate 10 covers the orthographic projection of the aperture imaging area 21 on the base substrate 10, so that the length of the light path reflected from different positions of the fingerprint to be measured is basically the same, and reaches the sensor
  • the components 40 do not overlap each other, which improves the fingerprint resolution.
  • the length L of the small hole imaging area 21 is greater than the width of the fingerprint to be measured, and the width H of the small hole imaging area 21 is less than the length of the fingerprint to be measured.
  • the shape of the small hole imaging area 21 in this application is "long strip". Compared with the related technology, this arrangement increases the width of the small hole imaging area 21, so that when fingerprints are detected, the finger can be scanned upwards. There is no need to give a fingerprint detection position prompt, which is conducive to realizing touch and giving users a good use experience.
  • the shape of the opening 22 is circular or square, and the circular or square opening is more convenient and simple in actual design.
  • the shape of the opening can also be set to other shapes, such as a rhombus.
  • the embodiment of the present application does not limit the specific shape of the opening.
  • the openings can be formed by a patterning process, which includes: photoresist coating, exposure, development, etching, and stripping processes, which are not limited in the embodiment of the present application.
  • the diameter of the opening needs to be as small as possible, but not too small. If the diameter of the opening is too large Smaller size tends to cause too low illuminance on the surface of the sensor assembly 40, and difficult to extract imaging data.
  • the imaging data is better when the diameter of each opening is between 3 ⁇ m and 25 ⁇ m.
  • the sensor component 40 includes: an image sensor, which is used to obtain multiple partial fingerprint images of the fingerprint to be tested above the display panel passing through the aperture imaging area 21.
  • the buffer layer in the embodiment of the present application can diffuse the substance in the light-emitting device into the light-shielding layer in the subsequent process, which can improve the yield of the display panel.

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Abstract

一种显示面板、指纹识别方法和显示装置,其中,显示面板包括:衬底基板以及设置在衬底基板上的遮光层、发光器件和传感器组件;遮光层位于发光器件和传感器组件之间;遮光层包括:小孔成像区域;所述小孔成像区域在第一方向上的尺寸小于所述待测指纹在所述第一方向上的尺寸,且所述小孔成像区域在第二方向上的尺寸大于所述待测指纹在所述第二方向上的尺寸;小孔成像区域用于检测待测指纹时,将局部待测指纹成像到传感器组件上。

Description

显示面板、指纹识别方法和显示装置
相关申请的交叉引用
本申请主张在2019年4月10日在中国提交的中国专利申请号No.201910283570.9的优先权,其全部内容通过引用包含于此。
技术领域
本文涉及触控显示技术领域,具体涉及一种显示面板、指纹识别方法和显示装置。
背景技术
指纹是人体与生俱来独一无二并可与他们相区别的不变特征,它由指端皮肤表面上的脊和谷组成,这些脊和谷的组成细节决定了指纹图案的唯一性。由之发展起来的带有指纹识别功能的显示面板已经被用于个人身份验证上,增加了显示装置的信息安全性。现有的显示面板一般均具有指纹识别功能。
发明内容
第一方面,本申请提供一种显示面板,包括:衬底基板以及设置在所述衬底基板上的遮光层、发光器件和传感器组件;所述遮光层位于所述发光器件和所述传感器组件之间;
所述遮光层包括:小孔成像区域;所述小孔成像区域在第一方向上的尺寸小于所述待测指纹在所述第一方向上的尺寸,且所述小孔成像区域在第二方向上的尺寸大于所述待测指纹在所述第二方向上的尺寸;所述小孔成像区域用于当检测待测指纹时,将局部待测指纹成像到传感器组件上。
可选地,所述遮光层位于所述衬底基板靠近所述发光器件的一侧,所述传感器组件位于所述衬底基板远离所述遮光层一侧。
可选地,所述遮光层在所述衬底基板上的正投影覆盖所述发光器件在所述衬底基板上的正投影。
可选地,所述传感器组件在所述衬底基板上的正投影覆盖所述小孔成像 区域在所述衬底基板上的正投影。
可选地,所述小孔成像区域的长度大于所述待测指纹的宽度,所述小孔成像区域的宽度小于所述待测指纹的长度。
可选地,所述小孔成像区域包括阵列排列的多个开孔;位于同一行或同一列的开孔的中心位于同一条直线上。
可选地,所述开孔的形状为圆形,所述每个开孔的直径为3微米~25微米。
可选地,相邻开孔之间的距离相等。
可选地,所述传感器组件包括:图像传感器,所述图像传感器用于获取在显示面板上方的待测指纹经过小孔成像区域的多个局部指纹图像;
所述显示面板还包括:处理器;
所述处理器,与所述图像传感器连接,用于将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
可选地,所述传感器组件还包括:压力传感器;
所述压力传感器,用于获取所述待测指纹施加在所述显示面板上的压力值;
所述处理器,与所述压力传感器连接,用于在所述压力值大于0的状态下,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
可选地,所述显示面板还包括:缓冲层;
所述缓冲层设置在所述遮光层靠近所述发光器件的一侧。
可选地,所述第一方向为所述小孔成像区域用于检测待测指纹时,所述待测指纹相对所述小孔成像区域移动的方向;所述第二方向垂直于所述第一方向。
可选地,整个所述小孔成像区域在检测待测指纹时,同一时刻只能将局部待测指纹成像到传感器组件上。
第二方面,本申请还提供一种显示装置,包括上述显示面板。
第二方面,本申请还提供一种指纹识别方法,应用于上述显示面板中,所述方法包括:
在检测待测指纹时,依次获取所述待测指纹沿着所述第一方向滑动经过 小孔成像区域时的多个局部指纹图像。
可选地,所述在检测待测指纹时,依次获取所述待测指纹沿着所述第一方向滑动经过小孔成像区域时的多个局部指纹图像之后,所述方法还包括:
将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
可选地,所述将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像包括:
获取所述待测指纹施加在显示面板上的压力值;
在所述压力值大于0的状态下,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
本申请的其它特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本申请而了解。本申请的其他优点可通过在说明书、权利要求书以及附图中所描述的方案来实现和获得。
附图说明
附图用来提供对本申请技术方案的理解,并且构成说明书的一部分,与本申请的实施例一起用于解释本申请的技术方案,并不构成对本申请技术方案的限制。
图1为相关技术中显示面板的侧视图;
图2为相关技术中小孔的分布示意图;
图3为本申请至少一个实施例提供的显示面板的侧视图一;
图4为本申请至少一个实施例提供的遮光层的俯视图;
图5为本申请至少一个实施例提供的显示面板的光路图;
图6为本申请至少一个实施例提供的显示面板的侧视图二。
具体实施方式
本申请描述了多个实施例,但是该描述是示例性的,而不是限制性的,并且对于本领域的普通技术人员来说显而易见的是,在本申请所描述的实施例包含的范围内可以有更多的实施例和实现方案。尽管在附图中示出了许多可能的特征组合,并在具体实施方式中进行了讨论,但是所公开的特征的许 多其它组合方式也是可能的。除非特意加以限制的情况以外,任何实施例的任何特征或元件可以与任何其它实施例中的任何其他特征或元件结合使用,或可以替代任何其它实施例中的任何其他特征或元件。
本申请包括并设想了与本领域普通技术人员已知的特征和元件的组合。本申请已经公开的实施例、特征和元件也可以与任何常规特征或元件组合,以形成由权利要求限定的独特的发明方案。任何实施例的任何特征或元件也可以与来自其它发明方案的特征或元件组合,以形成另一个由权利要求限定的独特的发明方案。因此,应当理解,在本申请中示出和/或讨论的任何特征可以单独地或以任何适当的组合来实现。因此,除了根据所附权利要求及其等同替换所做的限制以外,实施例不受其它限制。此外,可以在所附权利要求的保护范围内进行各种修改和改变。
此外,在描述具有代表性的实施例时,说明书可能已经将方法和/或过程呈现为特定的步骤序列。然而,在该方法或过程不依赖于本文所述步骤的特定顺序的程度上,该方法或过程不应限于所述的特定顺序的步骤。如本领域普通技术人员将理解的,其它的步骤顺序也是可能的。因此,说明书中阐述的步骤的特定顺序不应被解释为对权利要求的限制。此外,针对该方法和/或过程的权利要求不应限于按照所写顺序执行它们的步骤,本领域技术人员可以容易地理解,这些顺序可以变化,并且仍然保持在本申请实施例的精神和范围内。
除非另外定义,本公开实施例公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开实施例中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性,而只是用来区分不同的组成部分。“包括”或者“包含”等类似的词语意指出现该词前面的元件或物件涵盖出现在该词后面列举的元件或者物件及其等同,而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接,而是可以包括电性的连接,不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系,当被描述的对象的绝对位置改变后,则该相对位置关系也可能相应地改变。
相关技术中,带有指纹识别功能的显示面板利用图像传感器和显示面板 中设计的小孔通过小孔成像原理实现指纹识别。经发明人研究发现,相关技术中的显示面板上的小孔分布区域较大,使得显示面板中无法正常显示的像素点的数量较多,导致了显示面板的成像效果较差。图1为相关技术中显示面板的侧视图,图2为相关技术中小孔的分布示意图,如图1和2所示,相关技术中的显示面板包括:发光器件1、过孔2和传感器3。
具体的,小孔成像原理为:光在同种均匀介质中,在不受引力作用干扰的情况下沿直线传播,在检测指纹时,手指的不同位置反射发光器件1发射的光线,反射的光线通过显示面板上的过孔2到达传感器3的不同位置处,传感器3根据接收到的光线得到指纹图像,并将采集到的指纹图像与原始指纹进行对比识别,以此判断指纹是否匹配实现解锁。需要说明的是,相关技术中的显示面板在检测指纹时,过孔2对应的显示面板的像素点处于常亮状态。
如图2所示,相关技术中的过孔2的分布区域覆盖了指纹面积,其过孔2的分布区域的面积较大,使得在检测指纹时无法正常显示的像素点数量较多,进而导致了显示面板的成像效果较差。另外,相关技术中的过孔2的分布区域虽然面积较大,但是宽度较窄,使得显示面板在检测指纹前通常需要给出位置提示,不利于实现触控。
为了解决上述技术问题,本申请实施例提供了一种显示面板、指纹检测方法和显示装置,具体说明如下:
本申请实施例提供一种显示面板,图3为本申请实施例提供的显示面板的侧视图一,图4为本申请实施例提供的遮光层的俯视图。在一些实施例中,显示面板优选地为OLED显示面板。如图3和图4所示,本申请实施例提供的显示面板包括:衬底基板10以及设置在衬底基板10上的遮光层20、发光器件30和传感器组件40;遮光层20位于发光器件30和传感器组件40之间。
具体的,遮光层20包括:小孔成像区域21,小孔成像区域21用于当检测待测指纹时,将局部待测指纹成像到传感器组件40上。
其中,发光器件30包括检测区域,该检测区域在衬底基板上的正投影与小孔成像区域在衬底基板上的正投影重合。具体的,本实施例中当检测待测指纹时,待测指纹放置在检测区域上。
可选地,衬底基板10可以为刚性衬底或柔性衬底,其中,刚性衬底可以为但不限于玻璃、金属箔片中的一种或多种;柔性衬底可以为但不限于聚对苯二甲酸乙二醇酯、对苯二甲酸乙二醇酯、聚醚醚酮、聚苯乙烯、聚碳酸酯、聚芳基酸酯、聚芳酯、聚酰亚胺、聚氯乙烯、聚乙烯、纺织纤维中的一种或多种。
可选地,遮光层20的制作材料可以为金属或非金属遮光材料。金属或者黑矩阵材料,本申请实施例对此不作任何限定,本申请实施例并不具体限定遮光层的厚度,只要能够起到遮光的效果即可。
可选地,为了避免显示面板厚度较大,本申请实施例中遮光层20的厚度较小,此时,在制作显示面板时,无需设置额外的制备工艺对小孔成像区域进行填充,可以利用遮光层20远离衬底基板10的一侧的膜层对小孔成像区域进行填充,并且不会影响显示面板的其他性能,当然也可以额外设置其他的制备工艺对该小孔成像区域进行填充,根据具体情况进行选择,在此不作具体限定。
具体的,发光器件30具体包括:薄膜晶体管、阳极、发光层和阴极,其中,阳极与薄膜晶体管的漏电极连接,当检测指纹时,待测指纹反射的是发光层发射的光线。
可选地,发光器件30具有触控功能,可以为自容式,还可以为互容式,本申请实施例对此不作任何限定,具体根据实际需求确定。
具体的,为了保证能够正常检测指纹,小孔成像区域21在衬底基板10上的正投影位于衬底基板10的显示区域AA上。
本申请实施例中,小孔成像区域21的宽度为H,小孔成像区域21用于当检测待测指纹时,将宽度等于小孔成像区域21宽度的局部待测指纹成像到传感器组件40上。此处需要说明的是,当小孔成像区域21用于检测待测指纹时,待测指纹沿着图4中箭头所示的第一方向相对小孔成像区域21滑动;小孔成像区域21的宽度是指小孔成像区域21在上述第一方向上的尺寸。小孔成像区域21在垂直于所述第一方向的第二方向上的尺寸为小孔成像区域21的长度L,如图4所示。
如图3所示,当待测指纹在显示面板的检测区域上时,待测指纹被划分 成多个宽度为H的M个局部待测指纹,M个局部待测指纹相互平行,传感器组件40每次检测到一个局部待测指纹,通过连续检测多个局部待测指纹,以获得完整指纹图像,即在待测指纹在显示面板移动时扫描式检测指纹。具体的,完整指纹图像是根据平行等距的局部待测指纹叠加而成,完整指纹图像G的组成为:G=G1+G2+G3+G4+…+GM,其中,Gi表示宽度H的第i个局部待测指纹,1≤i≤M。
图5为本申请实施例提供的显示面板的光路图,如图5所示,当检测待测指纹时,显示面板发光层发出的光照射到待测指纹上,该光线到待测指纹上的光线经过待测指纹反射后进入显示面板上,该光线经过小孔成像照射到传感器组件上。
本申请实施例提供的显示面板包括:衬底基板以及设置在所述衬底基板上的遮光层、发光器件和传感器组件;遮光层位于发光器件和传感器组件之间;遮光层包括:小孔成像区域,小孔成像区域用于当检测待测指纹时,将局部待测指纹成像到传感器组件上。本申请中的位于遮光层上的小孔成像区域将局部待测指纹成像到传感器组件中,减小了显示面板中小孔的分布区域,使得显示面板中正常显示像素点的个数增加,进而提高了显示面板的成像效果。
本申请实施例中,如图3所示,遮光层20位于衬底基板10靠近发光器件30的一侧,传感器组件40位于衬底基板10远离遮光层20一侧。
为了保证显示面板的显示效果,遮光层20在衬底基板10上的正投影覆盖发光器件30在衬底基板10上的正投影。
本实施例中,传感器组件40在衬底基板10上的正投影覆盖小孔成像区域21在衬底基板10上的正投影。
本申请中传感器组件40在衬底基板10上的正投影覆盖小孔成像区域21在衬底基板10上的正投影,使得从待测指纹不同位置处反射回的光路长度基本一致,且到达传感器组件40时不会相互重叠,提高了指纹分辨率。
具体的,如图4所示,小孔成像区域21的长度L大于待测指纹的宽度,小孔成像区域21的宽度H小于待测指纹的长度。
可选地,小孔成像区域21的长度3厘米~20厘米,为了不影响显示面板 的显示效果,小孔成像区域21的宽度小于25微米,小孔成像区域21的宽度占用多行像素,具体占用的像素的行数根据实际情况确定,本申请实施例对此不作任何限定。
本申请中小孔成像区域21形状上来看为“长条形”,这样设置与相关技术相比,增加了小孔成像区域21的宽度,实现在检测指纹时,通过手指向上滑动扫描即可,不需要给出指纹检测位置提示,有利于实现触控,给用户带来良好的使用感受。
具体的,如图4所示,小孔成像区域21包括阵列排列的多个开孔22。
具体的,多个开孔22的行数和列数具体根据实际情况确定,本申请实施例对此不作任何限定。进一步地,为了保证经过小孔成像区域21所成的像的完整性,位于同一行或同一列的开孔22的中心位于同一条直线上。
可选地,开孔22的形状为圆形或者方形,圆形或者方形的开孔在实际设计时更加方便简单。当然,在实际设计时,还可将开孔的形状设置为其他形状,例如菱形,本申请实施例并不对开孔的具体形状做限定。具体实施时,开孔可以采用构图工艺制作形成,构图工艺包括:光刻胶的涂覆、曝光、显影、刻蚀以及剥离等工艺,本申请实施例对此不作任何限定。
在具体实施时,本申请实施例中的开孔的形状为圆形时,为了提高指纹识别的分辨精度,开孔的直径需要尽可能的小,但也不能太小,如果开孔的直径太小就容易造成传感器组件40表面的照度太低,所成像数据提取困难,较佳地,当开孔的形状为圆形时,各开孔的直径在3微米~25微米时成像数据较好。
可选地,多个开孔在遮光层上均匀分布,相邻开孔之间的距离可以相等,还可以不相等,可选地,相邻开孔之间的距离相等,且相邻两个开孔之间的距离为300微米~1250微米。
可选地,传感器组件40包括:图像传感器,图像传感器用于获取在显示面板上方的待测指纹经过小孔成像区域21的多个局部指纹图像。
具体的,显示面板还包括:处理器;其中,处理器,与图像传感器连接,用于将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。处理器还用于判断完整指纹图像与预先存储的原始指纹图像是否匹配。
可选地,图像传感器为电荷耦合(Charge-coupled Device,简称CCD)感光图像传感器或互补金属氧化物半导体(Complementary Metal Oxide Semiconductor,简称CMOS)感光图像传感器。
可选地,处理器可以为单片机,微处理器,嵌入式处理器即中央处理器,也可以为特定用于指纹识别的处理器,本申请实施例对此不作任何限定。
进一步地,本申请实施例中的传感器组件40还包括:压力传感器;压力传感器,用于获取待测指纹施加在显示面板上的压力值。
具体的,处理器,与压力传感器连接,用于在压力值大于0的状态下,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
可选地,图6为本申请实施例提供的显示面板的侧视图二,如图6所示,本申请实施例提供的显示面板还包括:缓冲层50,其中,缓冲层50设置在遮光层20靠近发光器件30的一侧。
可选地,缓冲层50的制作材料为透明材料,可以为氧化硅、氮化硅或氧化硅和氮化硅的复合物,本申请实施例对此不作任何限定。
具体的,本申请实施例中的缓冲层能够在后续工艺中发光器件中的物质扩散至遮光层内,能够提高显示面板的良品率。
下面通过指纹识别的工作原理过程,进一步说明本申请实施例的技术方案。
具体的:手指在显示面板上进行移动,显示面板自发光发出光线,一部分光线直接用于显示,另一部分照射到手指,由于手指指纹的脊(凸起的部分)与显示面板直接接触,而手指指纹的谷(凹陷的部分)未与显示面板直接接触,因此手指不同位置反射的光线有所不同,这些携带指纹脊与谷信息的反射光通过小孔成像区域到达图像传感器上,其中,图像传感器根据接收区域光能强弱判断脊与谷,经图像处理后产生清晰的局部指纹图像,图像传感器每次检测的局部指纹宽度为H,完全移动结束后将多个宽度为H的指纹拼接形成完整指纹图像,将完整的指纹图像与原始指纹图像进行对比,以此判断指纹是否匹配。
基于上述实施例的发明构思,本申请实施例还提供一种指纹识别方法,应用于上述显示面板中,本申请实施例提供的指纹识别方法包括:
在检测待测指纹时,获取待测指纹经过小孔成像区域的局部指纹图像。
其中,本申请提供的指纹识别方法,应用于上述显示面板中,其实现原理和实现效果类似,在此不再赘述。
可选地,在检测待测指纹时,获取待测指纹经过小孔成像区域的局部指纹图像之后,本申请实施例提供的指纹识别方法还包括:将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
可选地,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像包括:获取待测指纹施加在显示面板上的压力值;在压力值大于0的状态下,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
基于上述实施例的发明构思,本申请实施例还提供一种显示装置,包括:显示面板。
其中,本申请实施例中的显示面板为上述显示面板,其实现原理和实现效果类似,在此不再赘述。
其中,显示装置为触控显示装置,显示面板具有触控功能。
可选地,具有触控功能的显示面板可以为自容式显示面板或者互容式显示面板。自容式显示面板的触控电极的具体设置方式与相关技术相同,如采用公共电极复用为触控电极,这里不再赘述;互容式显示面板的触控电极的具体设置方式与相关技术相同,例如设置互相交叉绝缘的驱动电极和感应电极,这里不再赘述。
具体的,该显示装置可以为:手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。对于该显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的,在此不做赘述,也不应作为对本申请的限制。
本公开实施例附图只涉及本公开实施例涉及到的结构,其他结构可参考通常设计。
为了清晰起见,在用于描述本公开的实施例的附图中,层或微结构的厚度和尺寸被放大。可以理解,当诸如层、膜、区域或基板之类的元件被称作位于另一元件“上”或“下”时,该元件可以“直接”位于另一元件“上”或“下”,或者可以存在中间元件。
虽然本公开所揭露的实施方式如上,但所述的内容仅为便于理解本公开而采用的实施方式,并非用以限定本公开。任何本公开所属领域内的技术人员,在不脱离本公开所揭露的精神和范围的前提下,可以在实施的形式及细节上进行任何的修改与变化,但本公开的专利保护范围,仍须以所附的权利要求书所界定的范围为准。

Claims (17)

  1. 一种显示面板,包括:衬底基板以及设置在所述衬底基板上的遮光层、发光器件和传感器组件;所述遮光层位于所述发光器件和所述传感器组件之间;
    所述遮光层包括:小孔成像区域;所述小孔成像区域在第一方向上的尺寸小于所述待测指纹在所述第一方向上的尺寸,且所述小孔成像区域在第二方向上的尺寸大于所述待测指纹在所述第二方向上的尺寸;所述小孔成像区域用于当检测待测指纹时,将局部待测指纹成像到传感器组件上。
  2. 根据权利要求1所述的显示面板,其中,所述遮光层位于所述衬底基板靠近所述发光器件的一侧,所述传感器组件位于所述衬底基板远离所述遮光层一侧。
  3. 根据权利要求1所述的显示面板,其中,所述遮光层在所述衬底基板上的正投影覆盖所述发光器件在所述衬底基板上的正投影。
  4. 根据权利要求1所述的显示面板,其中,所述传感器组件在所述衬底基板上的正投影覆盖所述小孔成像区域在所述衬底基板上的正投影。
  5. 根据权利要求1~4任一项所述的显示面板,其中,所述小孔成像区域的长度大于所述待测指纹的宽度,所述小孔成像区域的宽度小于所述待测指纹的长度。
  6. 根据权利要求5所述的显示面板,其中,所述小孔成像区域包括阵列排列的多个开孔;位于同一行或同一列的开孔的中心位于同一条直线上。
  7. 根据权利要求6所述的显示面板,其中,所述开孔的形状为圆形,所述开孔的直径为3微米~25微米。
  8. 根据权利要求6所述的显示面板,其中,相邻开孔之间的距离相等。
  9. 根据权利要求1所述的显示面板,其中,所述传感器组件包括:图像传感器,所述图像传感器用于获取在显示面板上方的待测指纹经过小孔成像区域的多个局部指纹图像;
    所述显示面板还包括:处理器;
    所述处理器,与所述图像传感器连接,用于将接收到的多个局部指纹图 像进行拼接组合,形成完整指纹图像。
  10. 根据权利要求9所述的显示面板,其中,所述传感器组件还包括:压力传感器;
    所述压力传感器,用于获取所述待测指纹施加在所述显示面板上的压力值;
    所述处理器,与所述压力传感器连接,用于在所述压力值大于0的状态下,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
  11. 根据权利要求2所述的显示面板,其中,所述显示面板还包括:缓冲层;
    所述缓冲层设置在所述遮光层靠近所述发光器件的一侧。
  12. 根据权利要求1所述的显示面板,其中,所述第一方向为所述小孔成像区域用于检测待测指纹时,所述待测指纹相对所述小孔成像区域移动的方向;所述第二方向垂直于所述第一方向。
  13. 根据权利要求12所述的显示面板,其中,整个所述小孔成像区域在检测待测指纹时,同一时刻只能将局部待测指纹成像到传感器组件上。
  14. 一种显示装置,包括如权利要求1~13任一项所述的显示面板。
  15. 一种指纹识别方法,应用于如权利要求1~13任一项所述的显示面板中,所述方法包括:
    在检测待测指纹时,依次获取所述待测指纹沿着所述第一方向滑动经过小孔成像区域时的多个局部指纹图像。
  16. 根据权利要求15所述的方法,其中,所述在检测待测指纹时,依次获取所述待测指纹沿着所述第一方向滑动经过小孔成像区域时的多个局部指纹图像之后,所述方法还包括:
    将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
  17. 根据权利要求16所述的方法,其中,所述将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像包括:
    获取所述待测指纹施加在显示面板上的压力值;
    在所述压力值大于0的状态下,将接收到的多个局部指纹图像进行拼接组合,形成完整指纹图像。
PCT/CN2020/080134 2019-04-10 2020-03-19 显示面板、指纹识别方法和显示装置 WO2020207221A1 (zh)

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