WO2020155401A1 - 具有指纹辨识功能的显示装置及其制造方法 - Google Patents

具有指纹辨识功能的显示装置及其制造方法 Download PDF

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Publication number
WO2020155401A1
WO2020155401A1 PCT/CN2019/082697 CN2019082697W WO2020155401A1 WO 2020155401 A1 WO2020155401 A1 WO 2020155401A1 CN 2019082697 W CN2019082697 W CN 2019082697W WO 2020155401 A1 WO2020155401 A1 WO 2020155401A1
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Prior art keywords
cathodes
display device
light
fingerprint
fingerprint recognition
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PCT/CN2019/082697
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English (en)
French (fr)
Inventor
马亚龙
邓义超
戴其兵
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US16/488,409 priority Critical patent/US20210359273A1/en
Publication of WO2020155401A1 publication Critical patent/WO2020155401A1/zh
Anticipated expiration legal-status Critical
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    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/822—Cathodes characterised by their shape
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/805—Electrodes
    • H10K50/82—Cathodes
    • H10K50/828—Transparent cathodes, e.g. comprising thin metal layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/85—Arrangements for extracting light from the devices
    • H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • 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
    • 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
    • H10K59/80—Constructional details
    • H10K59/805—Electrodes
    • H10K59/8052—Cathodes
    • H10K59/80521—Cathodes characterised by their shape
    • 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
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • 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
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • 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
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays

Definitions

  • the present disclosure relates to the field of display technology, in particular to a display device with fingerprint recognition function and a manufacturing method thereof.
  • AMOLED Active-Matrix Organic Light-Emitting Diode
  • the dent part of the fingerprint that is, the part of the fingerprint that does not touch the surface of the cover glass
  • the surface of the cover glass still a glass/air interface, so total reflection (glass The refractive index is greater than that of air).
  • the convex part of the fingerprint (that is, the part where the fingerprint touches the surface of the cover glass) will make the surface of the cover glass a glass/sweat interface. Since the refractive index of sweat is close to that of glass, the total reflection angle is approximately 90 degrees. That is, total reflection basically does not occur.
  • the indented part of the fingerprint corresponds to the area inside the active matrix organic light-emitting diode display device.
  • the area on the surface of the plate glass corresponding to the active matrix organic light-emitting diode display device reflects a lot of light, so the difference between brightness and darkness can be used to form a fingerprint image for fingerprint recognition.
  • the brightness difference between the area corresponding to the concave portion of the fingerprint and the area corresponding to the convex portion of the fingerprint is not obvious enough, which leads to the problem of insensitive fingerprint recognition. More specifically, the light totally reflected by the area corresponding to the dent part of the fingerprint is not enough.
  • the purpose of the present disclosure is to provide a display device with a fingerprint recognition function and a manufacturing method thereof, which can solve the problem that the area corresponding to the dent portion of the fingerprint in the prior art is not sufficiently reflected by the light.
  • a display device with fingerprint identification function includes: a fingerprint identification module for sensing a fingerprint; a substrate arranged above the fingerprint identification module; and a plurality of anodes arranged on the Above the substrate; a plurality of light-emitting elements arranged above the plurality of anodes; a plurality of cathodes arranged above the plurality of light-emitting elements, each of the plurality of cathodes having a cylindrical shape; and a protective layer arranged on two Between adjacent cathodes and covering the plurality of cathodes, wherein the refractive index of each of the plurality of cathodes is less than the refractive index of the protective layer, and the axis of each of the plurality of cathodes is relative to the axis of the corresponding light-emitting element Hearts coincide.
  • the diameter of each of the plurality of cathodes is larger than the diameter of the corresponding light-emitting element.
  • the display device with fingerprint recognition function further includes: an encapsulation layer disposed above the protection layer.
  • the display device with fingerprint recognition function further includes: a cover glass disposed above the packaging layer.
  • a display device with fingerprint identification function includes: a fingerprint identification module for sensing a fingerprint; a substrate arranged above the fingerprint identification module; and a plurality of anodes arranged on the Above the substrate; a plurality of light-emitting elements arranged above the plurality of anodes; a plurality of cathodes arranged above the plurality of light-emitting elements, each of the plurality of cathodes having a columnar shape; and a protective layer arranged on two Between adjacent cathodes, the refractive index of each of the plurality of cathodes is smaller than the refractive index of the protective layer.
  • the cylindrical shape is a cylindrical shape.
  • the axis of each of the plurality of cathodes coincides with the axis of the corresponding light-emitting element.
  • the diameter of each of the plurality of cathodes is larger than the diameter of the corresponding light-emitting element.
  • the display device with fingerprint recognition function further includes: an encapsulation layer disposed above the protection layer.
  • the display device with fingerprint recognition function further includes: a cover glass disposed above the packaging layer.
  • the present disclosure provides a method for manufacturing a display device with fingerprint recognition function, including: arranging a substrate on a fingerprint recognition module; arranging a plurality of anodes on the substrate; A light-emitting element; a plurality of cathodes are arranged on the plurality of light-emitting elements, each of the plurality of cathodes has a columnar shape; and a plurality of cathodes, a protective layer is arranged between two adjacent cathodes, wherein each of the The refractive index of the plurality of cathodes is smaller than the refractive index of the protective layer.
  • the cylindrical shape is a cylindrical shape.
  • the axis of each of the plurality of cathodes coincides with the axis of the corresponding light-emitting element.
  • the diameter of each of the plurality of cathodes is larger than the diameter of the corresponding light-emitting element.
  • the display device with fingerprint recognition function and the manufacturing method thereof of the present disclosure can increase the amount of light totally reflected in the area corresponding to the dent portion of the fingerprint through the light emitting element and the protective layer. Therefore, the brightness difference between the area corresponding to the concave portion of the fingerprint and the area corresponding to the convex portion of the fingerprint can be more obvious, which can increase the sensitivity of fingerprint recognition.
  • FIG. 1 shows a display device with fingerprint recognition function according to an embodiment of the present disclosure.
  • Fig. 2 shows an enlarged schematic diagram of area A in Fig. 1.
  • FIG. 3 shows a flowchart of a manufacturing method of a display device with fingerprint identification function according to an embodiment of the present disclosure.
  • FIG. 1 shows a display device with fingerprint recognition function according to an embodiment of the present disclosure.
  • Fig. 2 shows an enlarged schematic diagram of area A in Fig. 1.
  • the display device may be an active matrix organic light emitting diode display device.
  • the display device includes a fingerprint recognition module 10, a substrate 12, a plurality of anodes 14, a plurality of light-emitting elements 16, a plurality of cathodes 18, a protective layer 20, an encapsulation layer 22, and a cover glass (Cover Glass, CG). )twenty four.
  • the fingerprint identification module 10 is used for sensing a fingerprint.
  • the substrate 12 is arranged above the fingerprint identification module 10.
  • the substrate 12 may be a flexible substrate.
  • the substrate 12 includes a thin film transistor layer (not shown) and related circuits. The specific structure of the thin film transistor layer and its related circuits is well known to those of ordinary skill in the art, and will not be repeated here.
  • the plurality of anodes 14 are disposed above the substrate 12.
  • the plurality of anodes 14 are arranged in an array.
  • the plurality of light-emitting elements 16 are arranged above the plurality of anodes 14. Each of the plurality of light-emitting elements 16 corresponds to one of the plurality of anodes 14. More specifically, each of the plurality of light-emitting elements 16 is disposed above one of the plurality of anodes 14. The plurality of light-emitting elements 16 are arranged in an array. Each of the plurality of light-emitting elements 16 can emit colored light, such as but not limited to red, green or blue. Each of the plurality of light-emitting elements 16 may correspond to a sub-pixel.
  • a hole injection layer (not shown) and a hole transport layer (not shown) are further provided between the plurality of cathodes 18 and the plurality of light emitting elements 16.
  • the hole injection layer and the hole transport layer are well-known to those of ordinary skill in the art and are not the focus of this disclosure, and will not be repeated here.
  • the plurality of cathodes 18 are disposed above the plurality of light-emitting elements 16. Each of the plurality of cathodes 18 corresponds to one of the plurality of light-emitting elements 16. More specifically, each of the plurality of cathodes 18 is disposed above one of the plurality of light-emitting elements 16. The plurality of cathodes 18 are arranged in an array.
  • Each of the plurality of cathodes 18 has a cylindrical shape.
  • the cylindrical shape may be, but not limited to, a cylindrical shape.
  • the axis of each of the plurality of cathodes 18 coincides with the axis of the corresponding light emitting element 16, and the diameter of each of the plurality of cathodes 18 is larger than the corresponding light emitting element. The diameter of element 16.
  • each of the plurality of cathodes 18 is the same, and the size of each of the plurality of light-emitting elements 16 is the same. In other words, the difference between the diameter of the plurality of cathodes 18 and the diameter of the corresponding light-emitting element 16 is the same.
  • an electron transport layer (not shown) and an electron injection layer (not shown) are further provided between the plurality of light-emitting elements 16 and the plurality of cathodes 18.
  • the electron transport layer and the electron injection layer are well-known to those of ordinary skill in the art and are not the focus of this disclosure, and will not be repeated here.
  • the protective layer 20 is disposed between two adjacent cathodes 18 and covers the plurality of cathodes 18. More specifically, the protective layer 20 fills the space between two adjacent cathodes 18 and covers the plurality of cathodes 18.
  • the refractive index of the plurality of cathodes 18 is smaller than the refractive index of the protective layer 20.
  • the protective layer 20 is used to protect the plurality of cathodes 18.
  • the encapsulation layer 22 is disposed above the protection layer 20.
  • the encapsulation layer 22 is used to encapsulate the substrate 12, the plurality of anodes 14, the plurality of light-emitting elements 16, the plurality of cathodes 18 and the protective layer 20.
  • the cover glass 24 is disposed above the encapsulation layer 22 and used to protect the internal components of the display device.
  • the plurality of cathodes 18 in the present disclosure have a cylindrical shape, and the refractive index of the plurality of cathodes 18 is smaller than the refractive index of the protective layer 20. Therefore, as shown in FIG. 2, the light L1 emitted by the light-emitting element 16 will change the light-emitting light path after reaching the side wall of the cathode 18. That is, the angle ⁇ 1 between the refracted light L2 and the interface S1 (between the cathode 18 and the protective layer 20) becomes larger.
  • the angle ⁇ 1 between the refracted light L2 and the interface S1 is greater than the angle ⁇ 2 between the emitted light L1 and the interface S1. Since the angle ⁇ 1 between the refracted light L2 and the interface S1 becomes larger, the light that cannot be totally reflected can reach the angle at which the total reflection occurs. Light that could be totally reflected (such as L3) will not be affected, and total reflection can still occur.
  • the light-emitting element 16 and the protective layer 20 of the present disclosure can increase the amount of total reflected light.
  • the light L4 with a larger angle can produce total reflection at the interface between the cover glass 24 and the air.
  • the light L5 with a smaller angle is only partially reflected and partially refracted at the interface between the cover glass 24 and the air.
  • Vertical light L6 will not reflect.
  • the indented portion 32 of the fingerprint 30 (that is, the part of the fingerprint 30 that does not touch the surface of the cover glass 24) will cause the cover glass to
  • the surface of 24 is still a glass/air interface, so total reflection will occur (the refractive index of glass is greater than that of air).
  • the convex portion 34 of the fingerprint 30 (that is, the portion of the fingerprint 30 that contacts the surface of the cover glass 24) will make the surface of the cover glass 24 a glass/sweat interface. Since the refractive index of sweat is close to that of glass, the total reflection angle is approximately 90 degrees. That is, total reflection basically does not occur.
  • the dent portion 32 of the fingerprint 30 corresponding to the area inside the display device reflects more light than the convex portion 34 of the fingerprint 30 corresponds to the area inside the display device.
  • the difference between light and dark can be used to form a fingerprint image for fingerprint identification.
  • the light-emitting element 16 and the protective layer 20 of the present disclosure can increase the amount of light that is totally reflected by the dent portion 32 of the fingerprint 30 corresponding to the area inside the display device. Therefore, the brightness difference between the area corresponding to the indented portion 32 of the fingerprint 30 and the area corresponding to the convex portion 34 of the fingerprint 30 can be more obvious, thereby increasing the sensitivity of fingerprint recognition.
  • FIG. 3 shows a flow chart of a manufacturing method of a display device with fingerprint identification function according to an embodiment of the present disclosure.
  • a substrate is set on the fingerprint recognition module.
  • the fingerprint identification module is used for sensing a fingerprint.
  • a plurality of light-emitting elements are disposed on the plurality of anodes.
  • a plurality of cathodes are provided on the plurality of light-emitting elements.
  • Each of the plurality of cathodes has a columnar shape.
  • the cylindrical shape may be, but not limited to, a cylindrical shape.
  • the axis of each of the plurality of cathodes coincides with the axis of the corresponding light-emitting element, and the diameter of each of the plurality of cathodes is larger than the diameter of the corresponding light-emitting element.
  • each of the plurality of cathodes is the same, and the size of each of the plurality of light-emitting elements is the same. In other words, the difference between the diameter of the plurality of cathodes and the diameter of the corresponding light-emitting element is the same.
  • a protective layer is disposed between two adjacent cathodes.
  • the refractive index of each of the plurality of cathodes is less than the refractive index of the protective layer.
  • the protective layer 20 fills the space between two adjacent cathodes 18 and covers the plurality of cathodes 18.
  • an encapsulation layer is provided on the protective layer.
  • the encapsulation layer is used to encapsulate the substrate, the plurality of anodes, the plurality of light-emitting elements, the plurality of cathodes, and the protective layer.
  • a cover glass is provided on the encapsulation layer.
  • the cover glass is used to protect the internal components of the display device.
  • the display device with fingerprint recognition function and the manufacturing method thereof of the present disclosure can increase the amount of light totally reflected in the area corresponding to the dent portion of the fingerprint through the light-emitting element and the protective layer. Therefore, the brightness difference between the area corresponding to the concave portion of the fingerprint and the area corresponding to the convex portion of the fingerprint can be more obvious, which can increase the sensitivity of fingerprint recognition.

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Abstract

一种具有指纹识别功能的显示装置，包括：指纹识别模块，用于感测一指纹；基板，设置于所述指纹识别模块上方；多个阳极，设置于所述基板上方；多个发光元件，设置于所述多个阳极上方；多个阴极，设置于所述多个发光元件上方，每一所述多个阴极具有柱体状；以及保护层，设置于两相邻阴极之间，其中每一所述多个阴极的折射率小于所述保护层的折射率。还提供一种具有指纹识别功能的显示装置的制造方法。

Description

具有指纹辨识功能的显示装置及其制造方法 技术领域
本揭示涉及显示技术领域，特别是涉及一种具有指纹辨识功能的显示装置及其制造方法。
 背景技术
于屏下光学指纹识别技术中，主动矩阵有机发光二极管（Active-Matrix Organic Light-Emitting Diode，AMOLED）显示装置的有机发光层向各个方向发出光，发出的光达到盖板玻璃（Cover Glass，CG）表面的玻璃/空气界面时会发生折射跟反射。假设空气的折射率为n1，盖板玻璃的折射率为n2，若发出的光达到盖板玻璃的入射角θ大于arcsin(n1/n2)时（亦即对n1/n2的比值求反正弦）会发生全反射。
当有指纹按压在盖板玻璃表面时，指纹的凹痕部分（亦即指纹未接触盖板玻璃表面的部分）会使得盖板玻璃表面仍然为玻璃/空气界面，因此会产生全反射（玻璃的折射率大于空气的折射率）。
指纹的凸痕部分（亦即指纹接触盖板玻璃表面的部分）会使得盖板玻璃表面为玻璃/汗水界面。由于汗水的折射率与玻璃接近，因此全反射角近似于90度。亦即基本上不会发生全反射。
综上可知，指纹的凹痕部分（亦即指纹未接触盖板玻璃表面的部分）对应至主动矩阵有机发光二极管显示装置内部的区域所反射的光比指纹的凸痕部分（亦即指纹接触盖板玻璃表面的部分）对应至主动矩阵有机发光二极管显示装置内部的区域所反射的光多，因此利用亮暗差异可形成指纹图像，进而进行指纹识别。
然而现有主动矩阵有机发光二极管显示装置中，指纹的凹痕部分对应的区域与指纹的凸痕部分对应的区域的亮暗差异不够明显，导致指纹识别不灵敏的问题。更明确地说，指纹的凹痕部分对应的区域所全反射的光还不够多。
因此需要对现有技术的问题提出解决方法。
 技术问题
本揭示的目的在于提供一种具有指纹辨识功能的显示装置及其制造方法，其能解决现有技术中指纹的凹痕部分对应的区域所全反射的光还不够多的问题。
 技术解决方案
为解决上述问题，本揭示提供的一种具有指纹识别功能的显示装置包括：指纹识别模块，用于感测一指纹；基板，设置于所述指纹识别模块上方；多个阳极，设置于所述基板上方；多个发光元件，设置于所述多个阳极上方；多个阴极，设置于所述多个发光元件上方，每一所述多个阴极具有圆柱体状；以及保护层，设置于两相邻阴极之间且覆盖所述多个阴极，其中每一所述多个阴极的折射率小于所述保护层的折射率，每一所述多个阴极的轴心与对应的发光元件的轴心重合。
于一实施例中，每一所述多个阴极的直径大于对应的发光元件的直径。
于一实施例中，所述具有指纹识别功能的显示装置进一步包括：封装层，设置于所述保护层上方。
于一实施例中，所述具有指纹识别功能的显示装置进一步包括：盖板玻璃，设置于所述封装层上方。
为解决上述问题，本揭示提供的一种具有指纹识别功能的显示装置包括：指纹识别模块，用于感测一指纹；基板，设置于所述指纹识别模块上方；多个阳极，设置于所述基板上方；多个发光元件，设置于所述多个阳极上方；多个阴极，设置于所述多个发光元件上方，每一所述多个阴极具有柱体状；以及保护层，设置于两相邻阴极之间，其中每一所述多个阴极的折射率小于所述保护层的折射率。
于一实施例中，所述柱体状为圆柱体状。
于一实施例中，每一所述多个阴极的轴心与对应的发光元件的轴心重合。
于一实施例中，每一所述多个阴极的直径大于对应的发光元件的直径。
于一实施例中，所述具有指纹识别功能的显示装置进一步包括：封装层，设置于所述保护层上方。
于一实施例中，所述具有指纹识别功能的显示装置进一步包括：盖板玻璃，设置于所述封装层上方。
为解决上述问题，本揭示提供的一种具有指纹识别功能的显示装置的制造方法包括：于指纹识别模块上设置基板；于所述基板上设置多个阳极；于所述多个阳极上设置多个发光元件；于所述多个发光元件上设置多个阴极，每一所述多个阴极具有柱体状；以及多个阴极，于两相邻阴极之间设置保护层，其中每一所述多个阴极的折射率小于所述保护层的折射率。
于一实施例中，所述柱体状为圆柱体状。
于一实施例中，每一所述多个阴极的轴心与对应的发光元件的轴心重合。
于一实施例中，每一所述多个阴极的直径大于对应的发光元件的直径。
 有益效果
相较于现有技术，本揭示之具有指纹识别功能的显示装置及其制造方法通过发光元件及保护层能增加指纹的凹痕部分对应的区域的全反射的光量。因此，指纹的凹痕部分对应的区域与指纹的凸痕部分对应的区域的亮暗差异能更加明显，进而能增加指纹识别的灵敏度。
 附图说明
图1显示根据本揭示一实施例之具有指纹识别功能的显示装置。
图2显示图1中区域A的放大示意图。
图3显示根据本揭示一实施例之具有指纹识别功能的显示装置的制造方法流程图。
 本发明的实施方式
以下各实施例的说明是参考附加的图式，用以例示本揭示可用以实施的特定实施例。
请参阅图1以及图2，图1显示根据本揭示一实施例之具有指纹识别功能的显示装置。图2显示图1中区域A的放大示意图。
所述显示装置可以为一主动矩阵有机发光二极管显示装置。所述显示装置包括一指纹识别模块10、一基板12、多个阳极14、多个发光元件16、多个阴极18、一保护层20、一封装层22以及一盖板玻璃（Cover Glass，CG）24。
所述指纹识别模块10用于感测一指纹。
所述基板12设置于所述指纹识别模块10上方。所述基板12可以为一软性基板。所述基板12上包括一薄膜晶体管层（未图示）及其相关线路。所述薄膜晶体管层及其相关线路的具体结构为本领域的普通技术人员所熟知，于此不多加赘述。
所述多个阳极14设置于所述基板12上方。所述多个阳极14呈阵列排列。
所述多个发光元件16设置于所述多个阳极14上方。每一所述多个发光元件16对应至所述多个阳极14的其中一者。更明确地说，每一所述多个发光元件16设置于所述多个阳极14的其中一者上方。所述多个发光元件16呈阵列排列。每一所述多个发光元件16可以发出彩色光，例如但不限于红色、绿色或蓝色。每一所述多个发光元件16可以对应至一子画素。
要说明的是，所述多个阴极18与所述多个发光元件16之间还设置有空穴注入层（未图示）及空穴传输层（未图示）。所述空穴注入层及所述空穴传输层为本领域的普通技术人员所熟知且并非本揭示之重点，于此不多加赘述。
所述多个阴极18设置于所述多个发光元件16上方。每一所述多个阴极18对应至所述多个发光元件16的其中一者。更明确地说，每一所述多个阴极18设置于所述多个发光元件16的其中一者上方。所述多个阴极18呈阵列排列。
每一所述多个阴极18具有柱体状。于一实施例中，所述柱体状可以为但不限于圆柱体状。当所述多个阴极18具有圆柱体状时，每一所述多个阴极18的轴心与对应的发光元件16的轴心重合，且每一所述多个阴极18的直径大于对应的发光元件16的直径。
此外，每一所述多个阴极18的尺寸相同，且每一所述多个发光元件16的尺寸相同。换句话说，所述多个阴极18的直径与对应的发光元件16的直径两者的差值皆相同。
要说明的是，所述多个发光元件16与所述多个阴极18之间还设置有电子传输层（未图示）及电子注入层（未图示）。所述电子传输层及所述电子注入层为本领域的普通技术人员所熟知且并非本揭示之重点，于此不多加赘述。
所述保护层20设置于两相邻阴极18之间且覆盖所述多个阴极18。更明确地说，所述保护层20填满两相邻阴极18之间且覆盖所述多个阴极18。所述多个阴极18的折射率小于所述保护层20的折射率。所述保护层20用于保护所述多个阴极18。
所述封装层22设置于所述保护层20上方。所述封装层22用于封装所述基板12、所述多个阳极14、所述多个发光元件16、所述多个阴极18及所述保护层20。
所述盖板玻璃24设置于所述封装层22上方且用于对所述显示装置内部元件提供保护。
为了解决现有技术中全反射的光还不够多的问题，本揭示之所述多个阴极18具有柱体状，且所述多个阴极18的折射率小于所述保护层20的折射率。因此，如图2所示，所述发光元件16发出的光L1达到所述阴极18的侧壁后会改变发光光路。也就是说，折射的光L2与界面S1（所述阴极18与所述保护层20之间）的角度θ1会变大。也就是说，折射的光L2与界面S1的角度θ1会大于发出的光L1与界面S1的角度θ2。由于折射的光L2与界面S1的角度θ1变大，因此原本不能发生全反射的光能达到发生全反射的角度。原本能发生全反射的光（例如L3）则不会受到影响，仍能发生全反射。综上，本揭示之发光元件16及所述保护层20能增加全反射的光量。
如图1所示，角度较大的光线L4能在所述盖板玻璃24与空气之间的界面产生全反射。角度较小的光线L5在所述盖板玻璃24与空气之间的界面只有部分反射，部分折射。垂直光L6则不会反射。
当一指纹30按压在所述盖板玻璃24表面时，所述指纹30的凹痕部分32（亦即所述指纹30未接触所述盖板玻璃24表面的部分）会使得所述盖板玻璃24表面仍然为玻璃/空气界面，因此会产生全反射（玻璃的折射率大于空气的折射率）。
所述指纹30的凸痕部分34（亦即所述指纹30接触所述盖板玻璃24表面的部分）会使得所述盖板玻璃24表面为玻璃/汗水界面。由于汗水的折射率与玻璃接近，因此全反射角近似于90度。亦即基本上不会发生全反射。
综上可知，所述指纹30的凹痕部分32对应至所述显示装置内部的区域所反射的光比所述指纹30的凸痕部分34对应至显示装置内部的区域所反射的光多，因此利用亮暗差异可形成指纹图像，进而进行指纹识别。
如上所述，本揭示之发光元件16及所述保护层20能增加所述指纹30的凹痕部分32对应至所述显示装置内部的区域的全反射的光量。因此，所述指纹30的凹痕部分32对应的区域与所述指纹30的凸痕部分34对应的区域的亮暗差异能更加明显，进而能增加指纹识别的灵敏度。
请参阅图3，图3显示根据本揭示一实施例之具有指纹识别功能的显示装置的制造方法流程图。
操作S30中，于指纹识别模块上设置基板。
所述指纹识别模块用于感测一指纹。
操作S32中，于所述基板上设置多个阳极。
操作S34中，于所述多个阳极上设置多个发光元件。
操作S36中，于所述多个发光元件上设置多个阴极。每一所述多个阴极具有柱体状。
于一实施例中，所述柱体状可以为但不限于圆柱体状。当所述多个阴极具有圆柱体状时，每一所述多个阴极的轴心与对应的发光元件的轴心重合，且每一所述多个阴极的直径大于对应的发光元件的直径。
此外，每一所述多个阴极的尺寸相同，且每一所述多个发光元件的尺寸相同。换句话说，所述多个阴极的直径与对应的发光元件的直径两者的差值皆相同。
操作S38中，于两相邻阴极之间设置保护层。每一所述多个阴极的折射率小于所述保护层的折射率。
更明确地说，所述保护层20填满两相邻阴极18之间且覆盖所述多个阴极18。
操作S40中，于所述保护层上设置封装层。
所述封装层用于封装所述基板、所述多个阳极、所述多个发光元件、所述多个阴极及所述保护层。
操作S42中，于所述封装层上设置盖板玻璃。
所述盖板玻璃用于对所述显示装置内部元件提供保护。
本揭示之具有指纹识别功能的显示装置及其制造方法通过发光元件及保护层能增加指纹的凹痕部分对应的区域的全反射的光量。因此，指纹的凹痕部分对应的区域与指纹的凸痕部分对应的区域的亮暗差异能更加明显，进而能增加指纹识别的灵敏度。
综上所述，虽然本揭示已以优选实施例揭露如上，但上述优选实施例并非用以限制本揭示，本领域的普通技术人员，在不脱离本揭示的精神和范围内，均可作各种更动与润饰，因此本揭示的保护范围以权利要求界定的范围为准。

Claims (14)

  1. 一种具有指纹识别功能的显示装置，包括：
    指纹识别模块，用于感测一指纹；
    基板，设置于所述指纹识别模块上方；
    多个阳极，设置于所述基板上方；
    多个发光元件，设置于所述多个阳极上方；
    多个阴极，设置于所述多个发光元件上方，每一所述多个阴极具有圆柱体状；以及
    保护层，设置于两相邻阴极之间且覆盖所述多个阴极，其中每一所述多个阴极的折射率小于所述保护层的折射率，每一所述多个阴极的轴心与对应的发光元件的轴心重合。
  2. 根据权利要求1所述的具有指纹识别功能的显示装置，其中每一所述多个阴极的直径大于对应的发光元件的直径。
  3. 根据权利要求1所述的具有指纹识别功能的显示装置，进一步包括：
    封装层，设置于所述保护层上方。
  4. 根据权利要求1所述的具有指纹识别功能的显示装置，进一步包括：
    盖板玻璃，设置于所述封装层上方。
  5. 一种具有指纹识别功能的显示装置，包括：
    指纹识别模块，用于感测一指纹；
    基板，设置于所述指纹识别模块上方；
    多个阳极，设置于所述基板上方；
    多个发光元件，设置于所述多个阳极上方；
    多个阴极，设置于所述多个发光元件上方，每一所述多个阴极具有柱体状；以及
    保护层，设置于两相邻阴极之间，其中每一所述多个阴极的折射率小于所述保护层的折射率。
  6. 根据权利要求5所述的具有指纹识别功能的显示装置，其中所述柱体状为圆柱体状。
  7. 根据权利要求6所述的具有指纹识别功能的显示装置，其中每一所述多个阴极的轴心与对应的发光元件的轴心重合。
  8. 根据权利要求7所述的具有指纹识别功能的显示装置，其中每一所述多个阴极的直径大于对应的发光元件的直径。
  9. 根据权利要求5所述的具有指纹识别功能的显示装置，进一步包括：
    封装层，设置于所述保护层上方。
  10. 根据权利要求5所述的具有指纹识别功能的显示装置，进一步包括：
    盖板玻璃，设置于所述封装层上方。
  11. 一种具有指纹识别功能的显示装置的制造方法，包括：
    于指纹识别模块上设置基板；
    于所述基板上设置多个阳极；
    于所述多个阳极上设置多个发光元件；
    于所述多个发光元件上设置多个阴极，每一所述多个阴极具有柱体状；以及
    多个阴极，于两相邻阴极之间设置保护层，其中每一所述多个阴极的折射率小于所述保护层的折射率。
  12. 根据权利要求7所述的具有指纹识别功能的显示装置的制造方法，其中所述柱体状为圆柱体状。
  13. 根据权利要求8所述的具有指纹识别功能的显示装置的制造方法，其中每一所述多个阴极的轴心与对应的发光元件的轴心重合。
  14. 根据权利要求9所述的具有指纹识别功能的显示装置的制造方法，其中每一所述多个阴极的直径大于对应的发光元件的直径。
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