WO2019218308A1 - 屏下指纹感测系统及电子装置 - Google Patents

屏下指纹感测系统及电子装置 Download PDF

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Publication number
WO2019218308A1
WO2019218308A1 PCT/CN2018/087317 CN2018087317W WO2019218308A1 WO 2019218308 A1 WO2019218308 A1 WO 2019218308A1 CN 2018087317 W CN2018087317 W CN 2018087317W WO 2019218308 A1 WO2019218308 A1 WO 2019218308A1
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Prior art keywords
photosensitive
illuminating
pixel array
photosensitive pixel
parallel
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PCT/CN2018/087317
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English (en)
French (fr)
Inventor
赵维民
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2018/087317 priority Critical patent/WO2019218308A1/zh
Priority to CN201880000616.5A priority patent/CN108701231A/zh
Publication of WO2019218308A1 publication Critical patent/WO2019218308A1/zh

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    • 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
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • 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

Definitions

  • the present invention relates to a screen fingerprint sensing system and an electronic device, and more particularly to a screen fingerprint sensing system and an electronic device capable of reducing the influence of moiré on a fingerprint image.
  • the optical fingerprint sensor can be disposed under the touch screen, that is, the Under Display fingerprint sensing. In other words, the user can press the touch screen to perform fingerprint recognition.
  • an object of some embodiments of the present application is to provide a screen fingerprint sensing system and an electronic device that can reduce the influence of Moiré stripes on fingerprint images to improve the disadvantages of the prior art.
  • the embodiment of the present application provides a screen fingerprint sensing system, which is disposed under the display screen, wherein the display screen includes an array of illuminating pixels, and the illuminating pixel array has a plurality of illuminating pixel rows.
  • the under-screen fingerprint sensing system comprising a lens; and a sensing module disposed under the lens, including a photosensitive pixel array
  • the photosensitive pixel array has a plurality of photosensitive pixel rows and a plurality of photosensitive pixel rows, the plurality of photosensitive pixel rows being parallel to a photosensitive row direction; wherein the light emitting row direction and the photosensitive row direction have An angle that is greater than 0° and less than 90°.
  • the illuminating pixel array includes a plurality of illuminating pixel units, and one of the plurality of illuminating pixel units includes a light emitting diode.
  • the photosensitive pixel array includes a plurality of photosensitive pixel units, and one of the plurality of photosensitive pixel units includes a photosensitive diode.
  • an embodiment of the present application further provides an electronic device, including a cover plate, and a display screen disposed under the cover plate, including an array of illuminating pixels, wherein the illuminating pixel array has multiple illuminating a pixel row and a plurality of illuminating pixel rows, the plurality of illuminating pixel rows being parallel to a illuminating row direction; and a screen fingerprint sensing system disposed under the display screen, including a lens; and a sensing module disposed on the
  • the photosensitive image array has a plurality of photosensitive pixel rows and a plurality of photosensitive pixel columns, wherein the plurality of photosensitive pixel rows are parallel to a photosensitive row direction; wherein the light is emitted There is an angle between the row direction and the direction of the photosensitive row, the angle being greater than 0° and less than 90°.
  • the photosensitive pixel array is rotated relative to the illuminating pixel array, and the distance between the Moiré fringe and the mirror core is opened, so that the area where the fingerprint image can be preserved by the filtering operation is large, which is advantageous for fingerprint recognition.
  • FIG. 1 is a schematic diagram of a screen fingerprint sensing system according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an illuminating pixel array and a photosensitive pixel array according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of an electronic device according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an electronic device according to an embodiment of the present invention.
  • Figure 5 is a schematic view of a screen structure image
  • FIG. 6 is a schematic view of a photosensitive pixel array of the embodiment
  • FIG. 7 is a schematic diagram of a photosensitive pixel array of the embodiment.
  • FIG. 1 is a schematic side view of an electronic device 1 according to an embodiment of the present application.
  • the electronic device 1 can be a smart phone or a tablet computer.
  • the electronic device 1 includes a cover 11 , a display screen 12 , and a screen fingerprint sensing system 10 .
  • the cover 11 may be glass or sapphire, without being limited thereto.
  • the under-screen fingerprint sensing system 10 is disposed under the display screen 12.
  • the display screen 12 includes an illuminating pixel array EPA.
  • the illuminating pixel array EPA is used to display a picture.
  • the illuminating pixel unit EP includes a plurality of illuminating pixel units EP.
  • LED light emitting diode
  • OLED organic light emitting diode
  • the under-screen fingerprint sensing system 10 includes a lens 14 and a sensing module 16.
  • the sensing module 16 is disposed under the lens 14, and includes a photosensitive pixel array SPA.
  • the photosensitive pixel array SPA includes a plurality of photosensitive pixel units SP, and the photosensitive pixel unit SP may include a photodiode.
  • the electronic device is to perform fingerprint recognition, the user presses on the cover 11 corresponding to the area of the photosensitive pixel array SPA, and the photosensitive pixel array SPA receives the reflected light reflected from the user's finger FG to generate a fingerprint image, and the fingerprint image can be transmitted to the rear.
  • End fingerprint identification module for fingerprint identification.
  • the surface of the lens 14 has a non-zero curvature/division.
  • the lens 14 is a convex lens whose curvature/diopter is positive, but is not limited to a single lens but may be multiple lens optics. .
  • FIG. 2 is a top view (or bottom view) of the OLED array EPA and the photosensitive pixel array SPA according to an embodiment of the present application.
  • the illuminating pixel array EPA has a plurality of illuminating pixel row (Row) EPRs and a plurality of illuminating pixel columns (EP), the plurality of illuminating pixel rows EPR are parallel to an illuminating row direction ERD, and the plurality of illuminating pixel columns EPR are parallel to one illuminating column.
  • Direction ECD is a plurality of illuminating pixel row (Row) EPRs and a plurality of illuminating pixel columns (EP), the plurality of illuminating pixel rows EPR are parallel to an illuminating row direction ERD, and the plurality of illuminating pixel columns EPR are parallel to one illuminating column.
  • Direction ECD is a plurality of illuminating pixel row (Row) EPRs and
  • the photosensitive pixel array SPA has a plurality of photosensitive pixel rows SPR and a plurality of photosensitive pixel columns SPC, the plurality of photosensitive pixel rows SPR are parallel to a photosensitive row direction SRD, and the plurality of photosensitive pixel columns SPC are parallel to a photosensitive column direction SCD.
  • an angle a between the light-emitting row direction ERD and the light-sensing row direction SPD ie, an angle a between the light-emitting column direction ECD and the photosensitive column direction SCD
  • the angle a is between 0° and 90°.
  • the angle a is greater than 0° and less than 90°.
  • the angle a can be 45°.
  • FIG. 1 only shows the OLED array EPA in the display screen 12.
  • the display screen 12 further includes an indium tin oxide (ITO) transparent conductive film, a conductive silver paste, an ITO substrate, and an OCA (Optical Clear).
  • Adhesive A component or material related to touch functions such as optical glue.
  • FIG. 1 only shows the photosensitive pixel array SPA in the sensing module 16.
  • the sensing module 16 further includes a column scan unit, an analog front end (Analog Front End) circuit, and an analog to digital converter ( Circuit components such as Analog-to-Digital Converter, ADC).
  • FIG. 3 is a schematic diagram of an electronic device 3 according to the embodiment.
  • FIG. 3 only shows the display screen 12 of the fingerprint sensing system 10 and the sensing module 16, and the sensing module 16 is disposed under the display screen 12, so it is indicated by a broken line.
  • the sensing module 16 is disposed on the electronic device 3 via a rotation angle a. In other words, as shown in FIG.
  • the long side L of the sensing module 16 is parallel to the photosensitive row direction SRD, and the short side W of the sensing module 16 is parallel to the photosensitive column direction SCD, and the photosensitive row direction SRD and the light emitting row direction ERD There is an angle a between them, so that the effect of the angle a between the light-emitting row direction ERD and the photosensitive row direction SRD can be achieved.
  • FIG. 4 is a schematic diagram of an electronic device 4 according to the embodiment. Similarly, FIG. 4 only shows the display screen 12 of the electronic device 4 and the sensing module 16, and the sensing module 16 is disposed under the display screen 12, so it is indicated by a broken line.
  • FIG. 4 only the photosensitive pixel array SPA is disposed on the electronic device 3 via the rotation angle a, and the long side L of the sensing module 16 remains parallel to the light emission row direction ERD, and the short side W and the light emitting column direction of the sensing module 16 are ECD is parallel. After the photosensitive pixel array SPA is rotated by the angle a, the photosensitive row direction SPD and the light-emitting row direction ERD have an angle a.
  • FIG. 5 is a schematic diagram of the screen structure images 5a, 5b.
  • the screen structure images 5a, 5b are images captured by the photosensitive pixel array for a monochrome object (such as pure black or pure white), and the screen structure image 5a is reflected by the reflected light from the monochrome object penetrating the indium oxide in the display screen 12. Tin-transparent conductive film, conductive silver paste, ITO substrate, optical glue, and ray generated by OLED array EPA.
  • the image 5a is a screen structure image captured when the angle a is 0° (or referred to as the OLED array EPA and the photosensitive pixel array SPA are aligned), and the image 5b is captured when the angle a is 45°.
  • the screen structure image (or the photosensitive pixel array SPA is rotated 45° with respect to the OLED array EPA).
  • the screen structure in the region Ra corresponding to the lens center of the lens 14, the screen structure exhibits a relatively regular/normal texture image.
  • the back-end fingerprint identification module can perform image processing such as filtering operation on the image captured in the area Ra, and process the image caused by the screen structure to retain the fingerprint image, wherein the filtering operation can be Band-Pass filtering operation.
  • the edge of the lens 14 has a high refractive index effect, and a high frequency component is generated at the edge of the lens 14, and the pitch between the photosensitive pixel units SP (Pitch)
  • the image formed by it will have an aliasing phenomenon (Aliasing), which cannot be removed by the filtering operation.
  • the image is distorted at the edge of the lens 14 to present the water ripple 51 or the fisheye pattern 52 in the image 5a, the so-called Moiré Pattern.
  • the illuminating pixel array EPA is aligned with the photosensitive pixel array SPA in the image 5a, after the light is reflected and traversed through the illuminating pixel array and the screen structure, more distortion is formed at the edge of the lens 14, so that the area Ra is compared. Small, the smaller area Ra can represent the smaller area of the regular screen structure image by using the filtering operation, and the area of the fingerprint image can be retained by the filtering operation, which is not conducive to fingerprint identification.
  • the photosensitive pixel array SPA is rotated by 45° with respect to the illuminating pixel array EPA, so that the light rays are reflected by the object and traverse the illuminating pixel array, and the distortion of the screen structure in the lens 14 is reduced, which is caused by
  • the fisheye pattern 52' (compared to the fisheye pattern 52 with an angle a of 0°) moves outward from the mirror core, and the moiré stripe begins to occur at a distance from the mirror center, causing the screen structure to present a regular/normal region.
  • Rb is larger, and the larger area Rb means that the area of the regular screen structure image can be removed by using the filtering operation, and the area of the fingerprint image can be preserved by the filtering operation, which is advantageous for fingerprint identification.
  • FIG. 6 and FIG. 7 are schematic diagrams of a photosensitive pixel array SPA6 and a photosensitive pixel array SPA7, respectively.
  • the photosensitive pixel array SPA6 can exhibit a hexagonal shape, and the photosensitive pixel array SPA7 can exhibit eight sides.
  • FIGS. 6 and 7 only show a part of the photosensitive pixel unit SP.
  • some of the hexagons of the photosensitive pixel array SPA6 are parallel to the light-emitting row direction ERD, and some of the octagons of the photosensitive pixel array SPA7 are parallel to the light-emitting row direction ERD. And some of the sides are parallel to the illuminating column direction ECD.
  • the photosensitive pixel array exhibiting a hexagonal shape is not limited to the light emission row direction ERD, and may be parallel to the light emission column direction ECD.
  • the photosensitive pixel row SPR is parallel to the photosensitive row direction SRD
  • the photosensitive pixel column SPC is parallel to the photosensitive column direction SCD
  • the light-emitting row direction ERD has an angle a between the light-emitting row direction ERD and the photosensitive row direction SPD, which is satisfied by the requirements of the present application. category.
  • the present application utilizes the photosensitive pixel array to rotate relative to the illuminating pixel array, and opens the distance between the Moiré fringe and the mirror core, so that the filtering operation can be used to preserve the fingerprint image area, which is advantageous for fingerprint identification. .

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Abstract

本申请提供了一种屏下指纹感测系统(10)，设置于显示屏(12)的下方，其中所述显示屏包括一发光像素阵列，所述发光像素阵列具有多个发光像素行及多个发光像素列，所述多个发光像素行平行于一发光行方向，所述屏下指纹感测系统包括透镜(14)；以及感测模块(16)，设置于所述透镜的下方，包括一感光像素阵列，其中所述感光像素阵列具有多个感光像素行及多个感光像素列，所述多个感光像素行平行于一感光行方向；其中，所述发光行方向与所述感光行方向之间具有一夹角，所述夹角大于0°且小于90°。

Description

屏下指纹感测系统及电子装置 技术领域
本申请涉及一种屏下指纹感测系统及电子装置，尤其涉及一种可降低莫尔条纹对指纹影像影响的屏下指纹感测系统及电子装置。
背景技术
随着科技日新月异，移动电话、数字相机、平板计算机、笔记本电脑等越来越多携带型电子装置已经成为了人们生活中必备的工具。由于携带型电子装置一般为个人使用，而具有一定的隐私性，因此其内部储存的数据，例如电话簿、相片、个人信息等等为私人所有。若电子装置一旦丢失，则这些数据可能会被他人所利用，而造成不必要的损失。虽然目前已有利用密码保护的方式来避免电子装置为他人所使用，但密码容易泄露或遭到破解，具有较低的安全性。并且，用户需记住密码才能使用电子装置，若忘记密码，则会带给使用者许多不便。因此，目前发展出利用个人指纹识别系统的方式来达到身份认证的目的，以提升数据安全性。
另一方面，随着指纹辨识技术的进步，隐形指纹传感器(Invisible Fingerprint Sensor，IFS)已逐渐受到消费者的青睐。在隐形指纹传感技术中，光学指纹传感器可设置于触控屏幕的下方，即屏幕下(Under Display)指纹感测。换句话 说，用户可透过按压触控屏幕以进行指纹辨识。
当屏下指纹感测利用透镜作为其光学结构时，由于透镜的曲度/屈光度(Diopter)的关系，于影像上对应于透镜边缘处会产生莫尔条纹(Moiré Pattern)，而不利于指纹辨识。为了避免莫尔条纹，现有技术可增加于透镜边缘处的影像分辨率，然而，分辨率增加代表受光面积减小，而导致光灵敏度变差，反而难以侦测微小的指纹信号。另外，为了避免莫尔条纹，现有技术可利用多片透镜减少其折光效果，然而，多片透镜需要较厚的空间，当屏下指纹感测应用于手机时，利用多片透镜会导致手机厚度增加，或是会压缩手机电池的空间，使得手机电池的蓄电量减少。现有技术针对莫尔条纹的解决方案，皆不适用于手机内的屏下指纹感测。
因此，现有技术实有改进的必要。
发明内容
因此，本申请部分实施例的目的即在于提供一种可降低穆尔条纹对指纹影像影响的屏下指纹感测系统及电子装置，以改善现有技术的缺点。
为了解决上述技术问题，本申请实施例提供了一种屏下指纹感测系统，设置于显示屏的下方，其中所述显示屏包括一发光像素阵列，所述发光像素阵列具有多个发光像素行及多个发光像素列，所述多个发光像素行平行于一发光行方向，所述屏下指纹感测系统包括透镜；以及感测模块，设置于所述透镜的下 方，包括一感光像素阵列，其中所述感光像素阵列具有多个感光像素行及多个感光像素列，所述多个感光像素行平行于一感光行方向；其中，所述发光行方向与所述感光行方向之间具有一夹角，所述夹角大于0°且小于90°。
例如，所述发光像素阵列包括多个发光像素单元，所述多个发光像素单元中一发光像素单元包括一发光二极管。
例如，所述感光像素阵列包括多个感光像素单元，所述多个感光像素单元中一感光像素单元包括一感光二极管。
为了解决上述技术问题，本申请实施例另提供了一种电子装置，包括盖板；显示屏，设置于所述盖板之下，包括一发光像素阵列，其中所述发光像素阵列具有多个发光像素行及多个发光像素列，所述多个发光像素行平行于一发光行方向；以及屏下指纹感测系统，设置于所述显示屏之下，包括透镜；以及感测模块，设置于所述透镜的下方，包括一感光像素阵列，其中所述感光像素阵列具有多个感光像素行及多个感光像素列，所述多个感光像素行平行于一感光行方向；其中，所述发光行方向与所述感光行方向之间具有一夹角，所述夹角大于0°且小于90°。
本申请利用感光像素阵列相对于发光像素阵列旋转，拉开穆尔条纹与镜心之间的距离，使得可利用滤波运算来保留指纹影像的区域较大，而有利于指纹辨识。
附图说明
图1为本申请实施例一屏下指纹感测系统的示意图；
图2为本申请实施例一发光像素阵列及一感光像素阵列的示意图；
图3为本实施例一电子装置的示意图；
图4为本实施例一电子装置的示意图；
图5为屏结构影像的示意图；
图6为本实施例一感光像素阵列的示意图；
图7为本实施例一感光像素阵列的示意图。
具体实施方式
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
请参考图1，图1为本申请实施例一电子装置1的侧视示意图。电子装置1可为智能手机或平板计算机，电子装置1包括盖板11、显示屏12以及屏下指纹感测系统10。盖板11可为玻璃或蓝宝石，而不限于此。屏下指纹感测系统10设置于显示屏12之下，显示屏12包括一发光像素阵列EPA，发光像素阵列EPA用来显示画面，其包括多个发光像素单元EP，发光像素单元EP可包括一发光二极管(LED)或一有机发光二极管(OLED)。屏下指纹感测系统10包括透镜14以及感测模块16。感测模块16设置于透镜14之下，其包括一感光 像素阵列SPA，感光像素阵列SPA包括多个感光像素单元SP，感光像素单元SP可包括一感光二极管(Photo Diode)。当电子装置欲进行指纹辨识时，使用者于盖板11上对应于感光像素阵列SPA的区域按压，感光像素阵列SPA接受反射自用户手指FG的反射光而产生指纹影像，指纹影像可传递至后端指纹辨识模块以进行指纹辨识。另外，透镜14表面具有非0的曲度/屈光度(Diopter)，一般来说，透镜14为一凸透镜，其曲度/屈光度为正值,但不受限为单一透镜而可以是多片透镜光学。
请参考图2，图2为本申请实施例发光像素阵列EPA及感光像素阵列SPA的俯视(或仰视)示意图。发光像素阵列EPA具有多个发光像素行(Row)EPR及多个发光像素列(Column)EPC，多个发光像素行EPR平行于一发光行方向ERD，多个发光像素列EPR平行于一发光列方向ECD。同样地，感光像素阵列SPA具有多个感光像素行SPR及多个感光像素列SPC，多个感光像素行SPR平行于一感光行方向SRD，多个感光像素列SPC平行于一感光列方向SCD。需注意的是，发光行方向ERD与感光行方向SPD之间具有一夹角a(即发光列方向ECD与感光列方向SCD之间具有夹角a)，夹角a介于0°与90°之间而不等于0°(或90°)，换句话说，夹角a大于0°且小于90°。较佳地，夹角a可为45°。
另外，图1仅绘示显示屏12中的发光像素阵列EPA，为了达到触控的功能，显示屏12还包括氧化铟锡(ITO)透明导电膜、导电银胶、ITO基板、OCA(Optical Clear Adhesive)光学胶等相关于触控功能的元件或材质。同样地，图 1仅绘示感测模块16中的感光像素阵列SPA，实际上，感测模块16还包括列扫描(Row Scan)单元、模拟前端(Analog Front End)电路以及模拟数字转换器(Analog-to-Digital Converter，ADC)等电路元件。
请参考图3，图3为本实施例一电子装置3的示意图。为求简洁，图3仅绘示屏下指纹感测系统10的显示屏12以及感测模块16，感测模块16设置于显示屏12之下，故以虚线表示。于图3中，感测模块16经旋转角度a而设置于电子装置3。换句话说，如图3所示，感测模块16的长边L与感光行方向SRD平行，感测模块16的短边W与感光列方向SCD平行，而感光行方向SRD与发光行方向ERD之间具有夹角a，如此一来，即可达到发光行方向ERD与感光行方向SRD之间具有夹角a的效果。
请参考图4，图4为本实施例一电子装置4的示意图。同样地，图4仅绘示电子装置4的显示屏12以及感测模块16，感测模块16设置于显示屏12之下，故以虚线表示。于图4中，仅感光像素阵列SPA经旋转角度a而设置于电子装置3，感测模块16的长边L仍维持与发光行方向ERD平行，感测模块16的短边W与发光列方向ECD平行。感光像素阵列SPA经旋转角度a后，感光行方向SPD与发光行方向ERD之间具有夹角a。
请参考图5，图5为屏结构影像5a、5b的示意图。屏结构影像5a、5b为感光像素阵列对单色对象(如纯黑色或纯白色)所撷取的影像，屏结构影像5a为反射自单色对象的反射光穿透显示屏12中的氧化铟锡透明导电膜、导电银 胶、ITO基板、光学胶以及发光像素阵列EPA所产生的纹路。影像5a为夹角a为0°(或称为发光像素阵列EPA与感光像素阵列SPA相互对齐(aligned))时所撷取的屏结构影像，影像5b为夹角a为45°时所撷取的屏结构影像(或称为感光像素阵列SPA相对于发光像素阵列EPA旋转45°)。
于影像5a中，于对应于透镜14镜心的区域Ra中，屏结构的呈现较为规则/正常的纹路影像。当进行指纹辨识时，后端指纹辨识模块可对区域Ra中撷取到的影像进行如滤波运算的图像处理，而处理掉因屏结构所造成的影像而保留指纹影像，其中该滤波运算可为带通(Band-Pass)滤波运算。而于区域Ra之外，由于透镜14为凸透镜的缘故，透镜14的边缘因折光效果较大的关系，在透镜14边缘处会产生高频成份，而在感光像素单元SP之间的间距(Pitch)不变的情况下(即空间上的取样率(Sample Rate))，其所形成的影像会有迭影现象(Aliasing)，造成无法利用滤波运算将之去除。换句话说，在透镜14边缘处会造成影像扭曲(Distortion)而呈现影像5a中的水波纹51或是鱼眼纹52，即所谓莫尔条纹(Moiré Pattern)。由于影像5a中，发光像素阵列EPA与感光像素阵列SPA是对齐的，造成光线经反射并穿越过发光像素阵列以及屏结构后，在透镜14的边缘会形成较多的扭曲，而使得区域Ra较小，区域Ra较小代表可利用滤波运算去除规则屏结构影像的区域较小，即可利用滤波运算来保留指纹影像的区域较小，不利于指纹辨识。
相较之下，于影像5b中，感光像素阵列SPA相对于发光像素阵列EPA旋转45°，可使得造成光线经对象反射后穿越过发光像素阵列以及屏结构在透镜 14的扭曲降低，其所造成的鱼眼纹52’(相较于夹角a为0°的鱼眼纹52)由镜心往外移动，莫尔条纹于镜心较远处才开始发生，使得屏结构呈现规则/正常的区域Rb较大，区域Rb较大代表可利用滤波运算去除规则屏结构影像的区域较大，即可利用滤波运算来保留指纹影像的区域较大，而有利于指纹辨识。
需注意的是，前述实施例用以说明本申请的概念，本领域具通常知识者当可据以做不同的修饰，而不限于此。举例来说，本申请的感光像素阵列不限于呈现矩形，其可呈现六边形或八边形，节省电路配置空间。请参考图6及图7，图6及图7分别为本实施例一感光像素阵列SPA6及一感光像素阵列SPA7的示意图，感光像素阵列SPA6可呈现六边形，感光像素阵列SPA7可呈现八边形，为了方便说明，图6及图7仅绘示部份感光像素单元SP。如图6及图7，感光像素阵列SPA6所呈现的六边形中有部份边与发光行方向ERD平行，感光像素阵列SPA7所呈现的八边形中有部份边与发光行方向ERD平行，而有部份边与发光列方向ECD平行。另外，呈现六边形的感光像素阵列不限于与发光行方向ERD，亦可与发光列方向ECD平行。只要感光像素行SPR平行于感光行方向SRD，感光像素列SPC平行于感光列方向SCD，发光行方向ERD与感光行方向SPD之间具有夹角a，即满足本申请的要求而属于本申请的范畴。
综上所述，本申请利用感光像素阵列相对于发光像素阵列旋转，拉开穆尔条纹与镜心之间的距离，使得可利用滤波运算来保留指纹影像的区域较大，而有利于指纹辨识。
以上所述仅为本申请的部分实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (14)

  1. 一种屏下指纹感测系统，设置于显示屏的下方，其中所述显示屏包括一发光像素阵列，所述发光像素阵列具有多个发光像素行及多个发光像素列，所述多个发光像素行平行于一发光行方向，其特征在于，所述屏下指纹感测系统包括：
    透镜；以及
    感测模块，设置于所述透镜的下方，包括一感光像素阵列，其中所述感光像素阵列具有多个感光像素行及多个感光像素列，所述多个感光像素行平行于一感光行方向；
    其中，所述发光行方向与所述感光行方向之间具有一夹角，所述夹角大于0°且小于90°。
  2. 如权利要求1所述的屏下指纹感测系统，其特征在于，所述发光像素阵列包括多个发光像素单元，所述多个发光像素单元中一发光像素单元包括一发光二极管。
  3. 如权利要求1所述的屏下指纹感测系统，其特征在于，所述感光像素阵列包括多个感光像素单元，所述多个感光像素单元中一感光像素单元包括一感光二极管。
  4. 如权利要求1所述的屏下指纹感测系统，其特征在于，所述透镜为一凸透镜或多片凸透镜结构。
  5. 如权利要求1所述的屏下指纹感测系统，其特征在于，所述夹角为45°。
  6. 如权利要求1所述的屏下指纹感测系统，其特征在于，所述感光像素阵列呈现一六边形，所述六边形的一第一边与所述发光行方向或所述发光列方向平行。
  7. 如权利要求1所述的屏下指纹感测系统，其特征在于，所述感光像素阵列呈现一八边形，所述八边形的一第一边与所述发光行方向平行，所述八边形的一第二边与所述发光列方向平行。
  8. 一种电子装置，其特征在于，包括：
    盖板；
    显示屏，设置于所述盖板之下，包括一发光像素阵列，其中所述发光像素阵列具有多个发光像素行及多个发光像素列，所述多个发光像素行平行于一发光行方向；以及
    屏下指纹感测系统，设置于所述显示屏之下，包括：
    透镜；以及
    感测模块，设置于所述透镜的下方，包括一感光像素阵列，其中所述感光像素阵列具有多个感光像素行及多个感光像素列，所述多个感光像素行平行于一感光行方向；
    其中，所述发光行方向与所述感光行方向之间具有一夹角，所述夹角大于0°且小于90°。
  9. 如权利要求8所述的电子装置，其特征在于，所述发光像素阵列包括多个发光像素单元，所述多个发光像素单元中一发光像素单元包括一发光二极管。
  10. 如权利要求8所述的电子装置，其特征在于，所述感光像素阵列包括多个感光像素单元，所述多个感光像素单元中一感光像素单元包括一感光二极管。
  11. 如权利要求8所述的电子装置，其特征在于，所述透镜为一凸透镜。
  12. 如权利要求8所述的电子装置，其特征在于，所述夹角为45°。
  13. 如权利要求8所述的电子装置，其特征在于，所述感光像素阵列呈现一六边形，所述六边形的一第一边与所述发光行方向或所述发光列方向平行。
  14. 如权利要求8所述的电子装置，其特征在于，所述感光像素阵列呈现一八边形，所述八边形的一第一边与所述发光行方向平行，所述八边形的一第二边与所述发光列方向平行。
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