WO2018024118A1 - 表面纹理信息采集器、表面纹理采集方法及显示装置 - Google Patents

表面纹理信息采集器、表面纹理采集方法及显示装置 Download PDF

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Publication number
WO2018024118A1
WO2018024118A1 PCT/CN2017/093826 CN2017093826W WO2018024118A1 WO 2018024118 A1 WO2018024118 A1 WO 2018024118A1 CN 2017093826 W CN2017093826 W CN 2017093826W WO 2018024118 A1 WO2018024118 A1 WO 2018024118A1
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WIPO (PCT)
Prior art keywords
light
texture information
surface texture
information collector
contact plate
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PCT/CN2017/093826
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English (en)
French (fr)
Inventor
吴俊纬
董学
王海生
刘英明
丁小梁
吕敬
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US15/760,105 priority Critical patent/US10489630B2/en
Publication of WO2018024118A1 publication Critical patent/WO2018024118A1/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
    • G06V40/1347—Preprocessing; Feature extraction
    • 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
    • G06V40/1347—Preprocessing; Feature extraction
    • G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop

Definitions

  • Embodiments of the present disclosure relate to a surface texture information collector, a surface texture collection method, and a display device.
  • the optical fingerprint collection method is one of the main methods currently used.
  • Embodiments of the present disclosure provide a surface texture information collector including a contact plate having a first surface configured to be in contact with a textured surface; a light source configured to emit light into the contact plate; a collecting unit, located at a side of the contact plate opposite to the first surface, wherein at least one of the collecting units comprises: a photosensitive element; a collecting element located between the photosensitive element and the contact plate; And a shading element between the concentrating element and the photosensitive element, wherein the shading element has a light transmissive aperture such that light from the source and propagating through the contact plate and the concentrating element passes through The light transmitting portion reaches the photosensitive member.
  • the main optical axis of the concentrating element is substantially perpendicular to the contact plate.
  • the concentrating element is a convex lens.
  • the shape of the light-transmissive aperture in the orthographic projection of the contact plate is substantially the same as the shape of the orthographic projection of the concentrating unit in the contact plate.
  • the center of the light transmission aperture is located on the main optical axis of the concentrating element.
  • the main optical axis of the concentrating element is located in a cross section, and the center of the light transmission hole and the focus of the concentrating element are both located in the cross section and do not coincide with each other, the light transmission hole
  • the width d in the cross section satisfies: d ⁇ sl / f; wherein s represents the center of the light transmission hole and the poly
  • the center of the light-transmissive aperture coincides with the focus of the concentrating element.
  • the contact plate is a light guide plate.
  • each of the acquisition units includes the shading element, and each of the shading elements is in the same layer.
  • the plurality of shading elements are formed in a unitary structure.
  • each of the acquisition units includes the concentrating elements, and each of the concentrating elements is in the same layer.
  • the surface texture information collector further includes a processing unit coupled to the photosensitive element, the processing unit configured to determine the surface texture information based on a current signal of the photosensitive element.
  • the photosensitive element includes only one photosensitive unit.
  • the photosensitive element includes at least two photosensitive units disposed adjacently.
  • the contact plate is a substrate that is transparent to light emitted by the light source.
  • the surface texture information includes at least one of fingerprint information and palm print information.
  • Another embodiment of the present disclosure provides a surface texture collecting method of any of the surface texture information collectors, comprising: when the textured surface contacts the first surface of the contact plate, the light emitted by the light source The contact plate is illuminated onto the textured surface to be reflected by the textured surface; light reflected by the textured surface passes through the contact plate and the concentrating element in turn The main optical axis direction of the concentrating element is concentrated; and light condensed in the main optical axis direction of the concentrating element is at least partially passed through the light transmitting hole and then irradiated onto the photosensitive element.
  • Yet another embodiment of the present disclosure provides a display device including any of the surface texture information collectors described above.
  • FIG. 1 is a schematic structural view of an optical fingerprint collection device
  • FIGS. 2a and 2b are schematic structural diagrams of a surface texture information collector provided by an embodiment of the present disclosure
  • 3a and 3b are schematic diagrams of partial optical paths of a surface texture information collector provided with a finger touch according to an embodiment of the present disclosure
  • FIGS. 4a to 4c are schematic diagrams showing relative positions between a light shielding unit and a collecting lens in a surface texture information collector according to an embodiment of the present disclosure
  • FIG. 5 is a schematic flowchart diagram of a method for collecting surface texture information of a surface texture information collector according to an embodiment of the present disclosure.
  • an optical fingerprint collection device includes a light guide plate 1 , a plurality of photosensitive cells 2 located under the light guide plate 1 , and a light source 3 located at an end surface of the light guide plate 1 .
  • the light emitted by the light source 3 is on the light guide plate 1 .
  • a surface texture information collector provided by an embodiment of the present disclosure, as shown in FIGS. 2a and 2b, includes a contact plate 01, a light source 03, and a photosensitive element layer 20 on a side of the contact plate 01 facing away from the first surface S1.
  • the photosensitive element layer 20 includes, for example, a plurality of photosensitive unit groups (i.e., photosensitive elements) 100; wherein each photosensitive element 100 includes at least one photosensitive unit 02.
  • the surface texture information collector further includes: one-to-one correspondence with each photosensitive unit group 100, and each located at each A plurality of collecting lenses (ie, concentrating elements) 04 between the photosensitive unit group 100 and the contact plate 01, and a collecting lens 04 for passing light incident from the collecting lens 04 toward the side of the contact plate 01 through the collecting lens 04
  • the rear condensing lens 04 converges in the main optical axis direction; the plurality of condensing lenses 04 are located, for example, on the concentrating element layer 40.
  • Each light-shielding unit (ie, light-shielding element) 05 corresponding to each of the condensing lenses 04 and located between each condensing lens 04 and the corresponding photosensitive unit group 100 has a light-transmissive hole H And the light condensed along the main optical axis direction of the condensing lens 04 is irradiated onto the corresponding photosensitive unit group 100 at least partially through the light transmission hole of the corresponding light shielding unit 05.
  • a plurality of light shielding units 05 are located in the light shielding element layer 50.
  • the corresponding concentrating element 04, shading element 05 and photosensitive element 100 constitute, for example, acquisition unit M.
  • the plurality of acquisition units M may be arranged in a matrix.
  • the surface texture information collector includes a contact plate, a light source, a plurality of photosensitive unit groups, a concentrating lens corresponding to each photosensitive unit group, and located between the photosensitive unit group and the contact plate, and Each of the condensing lenses has a one-to-one correspondence and a light shielding unit between each of the condensing lenses and the corresponding photosensitive unit group. Since each light-sensing unit group and the contact plate are further provided with a light-transmitting hole and a collecting lens, when the finger or the palm touches the first surface of the contact plate, the light-collecting lens is used to reflect back and illuminate by the finger or the palm.
  • the light to the condensing lens converges toward the main optical axis, but due to the arrangement of the light-transmitting holes, only some of the light that satisfies certain conditions can be illuminated onto the photosensitive unit group, thereby realizing that each photosensitive unit group only collects a specific transmission direction.
  • Light in turn, can reduce optical crosstalk.
  • the concentrating lens can increase the light intensity, thereby improving the sensitivity of the touch.
  • the surface texture information collector provided by the embodiment of the present disclosure can be applied not only to fingerprint collection, palmprint acquisition, or fingerprint and palmprint acquisition, but also to other textures, which is not limited herein.
  • the contact plate is configured to be in contact with the textured surface.
  • the textured surface is, for example, a finger skin surface, a palm skin surface, or the like.
  • the contact plate may be a transparent substrate, which is not limited herein.
  • the transparent substrate refers to, for example, a substrate that is transparent to light emitted from a light source.
  • the photosensitive unit group includes at least two photosensitive units disposed adjacently.
  • a processing unit coupled to the photosensitive unit, the processing unit configured to determine surface texture information based on current signals of the respective photosensitive units.
  • the processing unit can be implemented by a circuit having digital and logical operation processing functions, such as a central processing unit (CPU), a digital signal processor (DSP), a single chip microcomputer (MCU), a programmable logic array (FPGA), or other integrated circuits. (ASIC), etc.
  • the condensing lens 04 is a convex lens. Since the convex lens can converge the incident light parallel to the main optical axis at the same point of the main optical axis, that is, the focus O of the convex lens, so that only the incident light parallel to the main optical axis can be collected by the light transmission hole, as shown in FIG. 3a and FIG. As shown in FIG. 3b, corresponding to each photosensitive unit group 100, only the incident light in the region covered by the corresponding collecting lens 04 and parallel to the main optical axis is collected, and the light satisfying these conditions can only be located in the collecting lens 04. The light reflected by the fingerprint or the palm print in the covered area, so that no optical crosstalk occurs regardless of the distance between the photosensitive unit 02 and the upper surface of the contact plate 01.
  • the shape of the light-projecting hole in the orthographic projection of the contact plate is substantially the same as the shape of the orthographic projection of the convex lens on the contact plate, but the areas may be equal or unequal.
  • the center of the light transmission hole is located on the main optical axis of the convex lens.
  • the center of the light transmission hole means, for example, the geometric center of the light transmission hole.
  • the substantially identical shape here means that, for example, the shape of the orthographic projection of the light-transmitting hole in the contact plate is circular or square, and the shape of the orthographic projection of the convex lens on the contact plate also corresponds to a circle or a square. However, the area of two circles or two squares may be equal or unequal.
  • the width d of the light transmission hole in the cross section satisfies: D ⁇ sl/f; among them,
  • s represents the distance between the center A of the light-transmitting hole and the focus O of the convex lens
  • l represents the maximum width of the convex lens in the cross section
  • f represents the focal length of the convex lens. This ensures that all of the light incident on the lenticular lens can pass through the light transmission hole.
  • the distance between the light shielding unit 05 and the convex lens 04 may be smaller than the focal length f of the convex lens; or as shown in FIG. 4b, the light shielding unit 05 and the convex lens The distance of 04 may also be greater than the focal length f of the convex lens; or as shown in FIG. 4c, the distance between the light shielding unit 05 and the convex lens 04 may also be equal to the focal length f of the convex lens, that is, the focal point O of the convex lens coincides with the center A of the light transmission hole, where Without limitation, the cover can be determined according to the actual situation.
  • the center of the light transmission hole coincides with the focus of the convex lens, so that the aperture of the light transmission hole can be minimized, so that the convergence on the main optical axis can be avoided to the utmost extent.
  • a light-transmitting light-transmitting hole at a point other than the focus is irradiated onto the photosensitive unit group.
  • the focus refers to the focus on the side of the convex lens facing the photosensitive unit group.
  • the convex lens may be a double convex structure having two opposite protruding curved surfaces, or may be a flat convex structure having one flat surface and one protruding curved surface, and is not used herein. limited.
  • the contact plate is a light guide plate
  • the light source is disposed on the light incident side of the light guide plate.
  • the light source may be of a direct type or a side entry type.
  • the light entrance side is located on the side of the light guide plate facing the photosensitive unit group;
  • the light incident side is located on the side of the light guide plate, as shown in FIG. 2a and FIG. 2b, the light source 03 is located One end surface of the light guide plate.
  • the light source is incident on the end surface of the light guide plate, and the incident angle of the light can satisfy the total reflection of the light in the light guide plate.
  • the finger or the palm presses the light guide plate, since the refractive index of the finger is different from the air, The condition that the light is totally reflected in the light guide plate is destroyed, so that a part of the light is projected onto the finger or the palm through the surface of the light guide plate, and the light is scattered by the finger or the palm to generate scattered light at various angles.
  • each of the light shielding units 05 is located in the same layer, that is, the light shielding element layer 50, and can be formed simultaneously by one patterning process.
  • corresponding portions (eg, center points) of the respective shading units are all located in the same plane.
  • all of the light shielding units 05 are formed in a unitary structure.
  • each of the collecting lenses 04 is located on the concentrating element layer 40.
  • corresponding portions of each concentrating unit eg, left vertices
  • each of the photosensitive cells may be arranged in a matrix, which is not limited herein.
  • the embodiment of the present disclosure further provides a method for collecting surface texture information of any of the surface texture information collectors described above, as shown in FIG. 5, including the following steps:
  • the light reflected by the textured surface sequentially passes through the contact plate and the collecting lens, and then converges toward the main optical axis of the collecting lens;
  • the light concentrated along the main optical axis direction of the collecting lens passes through the light transmitting hole at least partially and is irradiated on the corresponding photosensitive unit group.
  • each photosensitive unit group can only collect light of a specific transmission direction, thereby reducing optical crosstalk.
  • an embodiment of the present disclosure further provides a display device, including any of the above surface texture information collectors provided by the embodiments of the present disclosure.
  • the display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, or the like.
  • a display device reference may be made to the embodiment of the surface texture information collector described above, and the repeated description is omitted.
  • a display panel is further included, and the surface texture information collector may be disposed at an edge position of the display panel, for example, the display panel is a mobile phone, and the surface texture information collector is set in the HOME of the mobile phone.
  • the surface texture information collector can also be embedded in the display panel and placed in the display area, or the surface texture information collector is a separate device, and is connected to the display panel through wires and interfaces, which is not limited herein.
  • the surface texture information collector comprises a contact plate, a light source, a plurality of photosensitive unit groups, one-to-one correspondence with each photosensitive unit group, and is located in the photosensitive A collecting lens between the unit group and the contact plate, and a light shielding unit corresponding to each of the collecting lenses and located between each of the collecting lenses and the corresponding photosensitive unit group. Due to A light-transmitting hole and a collecting lens are further disposed between each photosensitive unit group and the contact plate, so that when the finger or the palm touches the first surface of the contact plate, the lens or the palm is reflected back and illuminated by the collecting lens.
  • the light of the condensing lens converges in the direction of the main optical axis, but due to the arrangement of the light-transmitting holes, only some of the light that satisfies the specific conditions can be illuminated onto the photosensitive unit group, thereby realizing that only light of a specific transmission direction is collected for each photosensitive unit group. In turn, optical crosstalk can be reduced. Moreover, the concentrating lens can increase the light intensity, thereby improving the sensitivity of the touch.

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Abstract

本公开的实施例公开了一种表面纹理信息采集器、表面纹理采集方法及显示装置。所述表面纹理信息采集器包括：具有第一表面(S1)的接触板(01)，该第一表面(S1)构造为与具有纹理的表面接触；光源(03)，构造为发射光线进入所述接触板(01)；多个采集单元(M)，位于所述接触板(01)的相反于所述第一表面(S1)的一侧，其中，至少一个所述采集单元包括：感光元件(02)；聚光元件(04)，位于所述感光元件(100)与所述接触板(01)之间；以及遮光元件(05)，位于所述聚光元件(04)与所述感光元件(02)之间，其中，所述遮光元件(05)具有透光孔(H)，使得来自所述光源(03)且传播通过所述接触板(01)和所述聚光元件(04)的光穿过所述透光部(T)到达所述感光元件(02)。

Description

表面纹理信息采集器、表面纹理采集方法及显示装置 技术领域
本公开的实施例涉及一种表面纹理信息采集器、表面纹理采集方法及显示装置。
背景技术
现有的指纹采集装置大致有两种，一种是电容指纹采集装置，即基于电容式通过半导体芯片感应手指的指纹纹理，另一种是光学指纹采集装置，即利用光线在界面上因手指接触时脊线和谷线造成的光学差感应手指的指纹纹理。但是电容指纹采集方法存在抗静电、抗腐蚀能力不足，且指纹采集灵敏度不高的缺点。因此光学指纹采集方法是目前主要采用的方法之一。
发明内容
本公开的实施例提供一种表面纹理信息采集器，包括具有第一表面的接触板，该第一表面构造为与具有纹理的表面接触；光源，构造为发射光线进入所述接触板；多个采集单元，位于所述接触板的相反于所述第一表面的一侧，其中，至少一个所述采集单元包括：感光元件；聚光元件，位于所述感光元件与所述接触板之间；以及遮光元件，位于所述聚光元件与所述感光元件之间，其中，所述遮光元件具有透光孔，使得来自所述光源且传播通过所述接触板和所述聚光元件的光穿过所述透光部到达所述感光元件。
在一个示例中，所述聚光元件的主光轴实质垂直于所述接触板。
在一个示例中，所述聚光元件为凸透镜。
在一个示例中，所述透光孔在所述接触板的正投影的形状与所述聚光单元在所述接触板的正投影的形状实质相同。
在一个示例中，所述透光孔的中心位于所述聚光元件的主光轴上。
在一个示例中，所述聚光元件的主光轴位于一截面中，所述透光孔的中心与所述聚光元件的焦点均位于所述截面中且彼此不重合，所述透光孔在所述截面中的宽度d满足：d≥sl/f；其中，s表示所述透光孔的中心与所述聚 光元件的焦点之间的距离，l表示在所述截面中所述聚光元件的最大宽度，f表示所述聚光元件的焦距。
在一个示例中，所述透光孔的中心与所述聚光元件的焦点重合。
在一个示例中，所述接触板为导光板。
在一个示例中，每个所述采集单元都包括所述遮光元件，且各所述遮光元件位于同层。
在一个示例中，所述多个遮光元件形成为一体结构。
在一个示例中，每个所述采集单元都包括所述聚光元件，且各所述聚光元件位于同层。
在一个示例中，所述的表面纹理信息采集器还包括与所述感光元件连接的处理单元，所述处理单元被配置为根据所述感光元件的电流信号确定所述表面纹理信息。
在一个示例中，所述感光元件仅包括一个感光单元。
在一个示例中，所述感光元件包括至少两个相邻设置的感光单元。
在一个示例中，所述接触板为对所述光源发出的光透明的基板。
在一个示例中，所述表面纹理信息包括指纹信息和掌纹信息中的至少之一。
本公开的另一实施例提供一种上述任一表面纹理信息采集器的表面纹理采集方法，包括：当具有纹理的表面接触所述接触板的第一表面时，所述光源发出的光经所述接触板照射至所述具有纹理的表面上而被所述具有纹理的表面反射；被所述具有纹理的表面所反射回来的光依次经过所述接触板和所述聚光元件后向所述聚光元件的主光轴方向会聚；以及沿所述聚光元件的主光轴方向会聚的光至少部分穿过所述透光孔后照射在所述感光元件上。
本公开的又一实施例提供一种显示装置，包括上述任一表面纹理信息采集器。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制。
图1示出一种光学指纹采集装置的结构示意图；
图2a和图2b分别为本公开实施例提供的表面纹理信息采集器的结构示意图；
图3a和图3b分别为本公开实施例提供的表面纹理信息采集器在有手指触控时的部分光路原理图；
图4a至图4c分别为本公开实施例提供的表面纹理信息采集器中遮光单元与聚光透镜之间的相对位置示意图；
图5为本公开实施例提供的表面纹理信息采集器的表面纹理信息采集方法的流程示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
附图中各部件的形状和大小不反映真实比例，目的只是示意说明本公开内容。
如图1所示，一种光学指纹采集装置，包括导光板1，位于导光板1下方的若干感光单元2，以及位于导光板1一侧端面的光源3，光源3发出的光在导光板1中发生全反射，当有手指接触导光板1时，手指破坏了光线全反射的条件，因此会有部分光线照射在手指上，但是照射在手指上的光线会在手指处发生散射，这样就导致指纹同一位置处的光照射到多个感光单元2上，从而发生光串扰，特别是当手指与感光单元2之间的距离大时，光串扰问题较为严重。
本公开实施例提供的一种表面纹理信息采集器，如图2a和图2b所示，包括：接触板01、光源03和位于接触板01背离第一表面S1一侧的感光元件层20。感光元件层20例如包括多个感光单元组(即，感光元件)100；其中每个感光元件100包括至少一个感光单元02。
表面纹理信息采集器还包括：与各感光单元组100一一对应、且位于各 感光单元组100与接触板01之间的多个聚光透镜(即，聚光元件)04，聚光透镜04用于将由聚光透镜04面向接触板01一侧入射的光经聚光透镜04后向聚光透镜04的主光轴方向会聚；所述多个聚光透镜04例如均位于聚光元件层40。
与各聚光透镜04一一对应、且位于各聚光透镜04与对应的感光单元组100之间的每个遮光单元(即，遮光元件)05，每个遮光单元05具有一个透光孔H，且沿聚光透镜04的主光轴方向会聚的光至少部分穿过对应遮光单元05的透光孔照射在对应的感光单元组100上。例如，多个遮光单元05均位于遮光元件层50。
这里，对应的聚光元件04、遮光元件05和感光元件100例如构成采集单元M。多个采集单元M可呈矩阵排列。
本公开实施例提供的上述表面纹理信息采集器，包括接触板、光源、多个感光单元组、与各感光单元组一一对应、且位于感光单元组与接触板之间的聚光透镜，与各聚光透镜一一对应、且位于各聚光透镜与对应的感光单元组之间的遮光单元。由于在每一感光单元组与接触板之间还设置有透光孔和聚光透镜，这样当手指或手掌接触接触板的第一表面时，利用聚光透镜使由手指或手掌反射回来且照射到聚光透镜的光向主光轴方向会聚，但是由于有透光孔的设置，因此只有部分满足特定条件的光才能照到感光单元组上，从而实现各感光单元组仅采集特定传输方向的光，进而可以减少光串扰。并且，聚光透镜可以增加光强度，从而提高触控的灵敏度。
需要说明的是，本公开实施例提供的上述表面纹理信息采集器，不仅可以适用于指纹采集、掌纹采集或指纹和掌纹同时采集，还可以适用于其它纹路的采集，在此不作限定。
需要说明的是，在本公开实施例提供的上述表面纹理信息采集器中，接触板构造为与具有纹理的表面接触。这里，具有纹理的表面例如为手指皮肤表面，手掌皮肤表面等。例如，接触板可选为透明基板，在此不作限定。这里，透明基板例如是指对于光源发出的光透明的基板。
例如，在本公开实施例提供的上述表面纹理信息采集器中，感光单元组包括至少两个相邻设置的感光单元。
例如，在本公开实施例提供的上述表面纹理信息采集器中，还包括与各 感光单元连接的处理单元，该处理单元被配置为根据各感光单元的电流信号确定表面纹理信息。该处理单元可以通过具有数字和逻辑运算处理功能的电路实现，例如可以是中央处理器(CPU)、数字信号处理器(DSP)、单片机(MCU)、可编程逻辑阵列(FPGA)或其它集成电路(ASIC)等。
例如，在本公开实施例提供的上述表面纹理信息采集器中，如图3a和图3b所示，聚光透镜04为凸透镜。由于凸透镜可以使与主光轴平行的入射光会聚于主光轴的同一点上即凸透镜的焦点O上，从而可以利用透光孔仅采集与主光轴平行的入射光，如图3a和图3b所示，这样相当于各感光单元组100仅采集对应的聚光透镜04所覆盖的区域内、且平行主光轴的入射光，而满足这些条件的光只能是位于聚光透镜04所覆盖的区域内的指纹或掌纹所反射的光，从而不管感光单元02与接触板01上表面的距离多远，均不会产生光串扰。
例如，在本公开实施例提供的上述表面纹理信息采集器中，透光孔在接触板的正投影的形状与凸透镜在接触板的正投影的形状实质相同，但是面积可以相等也可以不相等。此外，透光孔的中心位于凸透镜的主光轴上。这里，透光孔的中心例如是指透光孔的几何中心。
需要说明的是这里的形状实质相同是指：例如透光孔在接触板的正投影的形状为圆形或正方形，那么凸透镜在接触板的正投影的形状也对应为圆形或正方形。但是两个圆形或两个正方形的面积可以相等，也可以不相等。
进一步地，在本公开实施例提供的上述表面纹理信息采集器中，如图4a至图4c中，在沿凸透镜的主光轴的任意截面中，透光孔在该截面中的宽度d满足：d≥sl/f；其中，
s表示透光孔的中心A与凸透镜的焦点O之间的距离，l表示在截面中凸透镜的最大宽度，f表示凸透镜的焦距。这样可以保证所有垂直入射凸透镜的光线均可以通过透光孔。
例如，在本公开实施例提供的上述表面纹理信息采集器中，如图4a所示，遮光单元05与凸透镜04的距离可以小于凸透镜的焦距f；或者如图4b所示，遮光单元05与凸透镜04的距离也可以大于凸透镜的焦距f；或者如图4c所示，遮光单元05与凸透镜04的距离也可以等于凸透镜的焦距f，即凸透镜的焦点O与透光孔的中心A重合，在此不作限定，可以根据实际情况确定遮 光单元05与凸透镜之间的相对位置。但是从图中可以看出，遮光单元05距离凸透镜的焦点O越远，遮光单元05上的透光孔的孔径越大。
例如，在本公开实施例提供的上述表面纹理信息采集器中，透光孔的中心与凸透镜的焦点重合，这样可以使透光孔的孔径最小，从而可以最大程度的避免会聚于主光轴上除了焦点之外的其它点上的光通透光孔照射到感光单元组上。
需要说明的是，本公开实施例提供的上述表面纹理信息采集器中，焦点均是指位于凸透镜面向感光单元组一侧的焦点。
例如，在本公开实施例提供的上述表面纹理信息采集器中，凸透镜可以是具有两个相对的突出曲面的双凸结构，也可以是具有一个平面和一个突出曲面的平凸结构，在此不作限定。
例如，在本公开实施例提供的上述表面纹理信息采集器中，接触板为导光板，光源设置在导光板的入光侧。
进一步地，在本公开实施例提供的上述表面纹理信息采集器中，光源可以是直下式的，也可以是侧入式的。当光源为是直下式时，入光侧位于导光板面向感光单元组一侧；当光源为侧入式时，入光侧位于导光板的侧面，如图2a和图2b所示，光源03位于导光板的一侧端面。
以光源为侧入式例，光源由导光板的端面入射，光线的入射角能够满足光线在导光板中进行全反射，当有手指或手掌按压导光板时，由于手指的折射率与空气不同，破坏了光线在导光板内全反射的条件，从而使一部分光线经过导光板的表面投射到手指或手掌上，手指或手掌对光线进行散射，产生各个角度的散射光。
例如，在本公开实施例提供的上述表面纹理信息采集器中，各遮光单元05位于同层，即遮光元件层50，这样制作时可以采用一次构图工艺同时形成。例如，各遮光单元的对应部分(例如，中心点)均位于同一平面中。
例如，在本公开实施例提供的上述表面纹理信息采集器中，所有遮光单元05形成为一体结构。
例如，在本公开实施例提供的上述表面纹理信息采集器中，各聚光透镜04均位于聚光元件层40。例如，各聚光单元的对应部分(例如，左顶点)均位于同一平面中。
例如，在本公开实施例提供的上述表面纹理信息采集器中，各感光单元可呈矩阵排列，在此不作限定。
基于同一发明构思，本公开实施例还提供了上述任一种表面纹理信息采集器的表面纹理信息采集方法，如图5所示，包括以下步骤：
S501、当具有纹理的表面接触接触板的第一表面时，光源发出的光经接触板照射至具有纹理的表面上被具有纹理的表面反射；
S502、被具有纹理的表面所反射回来的光依次经过接触板和聚光透镜后向聚光透镜的主光轴方向会聚；
S503、沿聚光透镜的主光轴方向会聚的光至少部分穿过透光孔后照射在对应的感光单元组上。
本公开实施例提供的上述纹路采集方法，当具有纹理的表面接触接触板的第一表面时，光源的光经接触板照射至具有纹理的表面上被具有纹理的表面反射；被具有纹理的表面所反射回来的光依次经过接触板和聚光透镜后向聚光透镜的主光轴方向会聚；沿聚光透镜的主光轴方向会聚的光至少部分穿过透光孔后照射在对应的感光单元组上，从而实现各感光单元组仅采集特定传输方向的光，进而可以减少光串扰。
基于同一发明构思，本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述任一种表面纹理信息采集器。该显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑等任何具有显示功能的产品或部件。该显示装置的实施可以参见上述表面纹理信息采集器的实施例，重复之处不再赘述。
例如，在本公开实施例提供的上述显示装置中，还包括有显示面板，表面纹理信息采集器可以设置在显示面板的边缘位置，例如显示面板为手机，表面纹理信息采集器设置在手机的HOME键上。当然，表面纹理信息采集器还可以内嵌在显示面板放入显示区域中，或者表面纹理信息采集器为一独立器件，与显示面板通过导线和接口连接，在此不作限定。
本公开实施例提供的上述表面纹理信息采集器、其纹路采集方法及显示装置，表面纹理信息采集器包括接触板、光源、多个感光单元组、与各感光单元组一一对应、且位于感光单元组与接触板之间的聚光透镜，与各聚光透镜一一对应、且位于各聚光透镜与对应的感光单元组之间的遮光单元。由于 在每一感光单元组与接触板之间还设置有透光孔和聚光透镜，这样当手指或手掌接触接触板的第一表面时，利用聚光透镜使由手指或手掌反射回来且照射到聚光透镜的光向主光轴方向会聚，但是由于有透光孔的设置，因此只有部分满足特定条件的光才能照到感光单元组上，从而实现各感光单元组仅采集特定传输方向的光，进而可以减少光串扰。并且，聚光透镜可以增加光强度，从而提高触控的灵敏度。
显然，本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范围。这样，倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。
本申请要求于2016年8月4日递交的中国专利申请第201610635106.8号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (18)

  1. 一种表面纹理信息采集器，包括：
    具有第一表面的接触板，该第一表面构造为与具有纹理的表面接触；
    光源，构造为发射光线进入所述接触板；
    多个采集单元，位于所述接触板的相反于所述第一表面的一侧，其中，至少一个所述采集单元包括：
    感光元件；
    聚光元件，位于所述感光元件与所述接触板之间；以及
    遮光元件，位于所述聚光元件与所述感光元件之间，其中，所述遮光元件具有透光孔，使得来自所述光源且传播通过所述接触板和所述聚光元件的光穿过所述透光部到达所述感光元件。
  2. 如权利要求1所述的表面纹理信息采集器，其中，所述聚光元件的主光轴实质垂直于所述接触板。
  3. 如权利要求1或2所述的表面纹理信息采集器，其中，所述聚光元件为凸透镜。
  4. 如权利要求1至3中任一项所述的表面纹理信息采集器，其中，所述透光孔在所述接触板的正投影的形状与所述聚光元件在所述接触板的正投影的形状实质相同。
  5. 如权利要求1至4中任一项所述的表面纹理信息采集器，其中，所述透光孔的中心位于所述聚光元件的主光轴上。
  6. 如权利要求1至5中任一项所述的表面纹理信息采集器，其中，所述聚光元件的主光轴位于一截面中，所述透光孔的中心与所述聚光元件的焦点均位于所述截面中且彼此不重合，所述透光孔在所述截面中的宽度d满足：d≥sl/f；
    其中，s表示所述透光孔的中心与所述聚光元件的焦点之间的距离，l表示在所述截面中所述聚光元件的最大宽度，f表示所述聚光元件的焦距。
  7. 如权利要求1至5中任一项所述的表面纹理信息采集器，其中，所述透光孔的中心与所述聚光元件的焦点重合。
  8. 如权利要求1至7中任一项所述的表面纹理信息采集器，其中，所述 接触板为导光板。
  9. 如权利要求1至8任一项所述的表面纹理信息采集器，其中，每个所述采集单元都包括所述遮光元件，且各所述遮光元件位于同层。
  10. 如权利要求9所述的表面纹理信息采集器，其中，所有所述多个遮光元件形成为一体结构。
  11. 如权利要求1至10任一项所述的表面纹理信息采集器，其中，每个所述采集单元都包括所述聚光元件，且各所述聚光元件位于同层。
  12. 如权利要求1至11中任一项所述的表面纹理信息采集器，还包括与所述感光元件连接的处理单元，所述处理单元被配置为根据所述感光元件的电流信号确定所述表面纹理信息。
  13. 如权利要求1至12中任一项所述的表面纹理信息采集器，其中，所述感光元件仅包括一个感光单元。
  14. 如权利要求1至12中任一项所述的表面纹理信息采集器，其中，所述感光元件包括至少两个相邻设置的感光单元。
  15. 如权利要求1至14中任一项所述的表面纹理信息采集器，其中，所述接触板为对所述光源发出的光透明的基板。
  16. 如权利要求1至15任一项所述的表面纹理信息采集器，其中，所述表面纹理信息包括指纹信息和掌纹信息中的至少之一。
  17. 一种如权利要求1至16中任一项所述的表面纹理信息采集器的表面纹理采集方法，包括：
    当具有纹理的表面接触所述接触板的第一表面时，所述光源发出的光经所述接触板照射至所述具有纹理的表面上而被所述具有纹理的表面反射；
    被所述具有纹理的表面所反射回来的光依次经过所述接触板和所述聚光元件后向所述聚光元件的主光轴方向会聚；以及
    沿所述聚光元件的主光轴方向会聚的光至少部分穿过所述透光孔后照射在所述感光元件上。
  18. 一种显示装置，包括如权利要求1至17中任一项所述的表面纹理信息采集器。
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