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 PDFInfo
- 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
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims description 37
- 239000000758 substrate Substances 0.000 claims description 5
- 230000001902 propagating effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
- 238000000059 patterning Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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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
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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
- G06V40/1347—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
Description
Claims (18)
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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。
- 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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US15/760,105 US10489630B2 (en) | 2016-08-04 | 2017-07-21 | Surface texture information collector, surface texture information collection method, and display device |
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CN201610635106.8A CN106228147B (zh) | 2016-08-04 | 2016-08-04 | 一种纹路采集器、其纹路采集方法及显示装置 |
CN201610635106.8 | 2016-08-04 |
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US20180260605A1 (en) | 2018-09-13 |
CN106228147B (zh) | 2023-04-18 |
US10489630B2 (en) | 2019-11-26 |
CN106228147A (zh) | 2016-12-14 |
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