WO2018214481A1 - 触控面板和显示装置 - Google Patents

触控面板和显示装置 Download PDF

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Publication number
WO2018214481A1
WO2018214481A1 PCT/CN2017/116139 CN2017116139W WO2018214481A1 WO 2018214481 A1 WO2018214481 A1 WO 2018214481A1 CN 2017116139 W CN2017116139 W CN 2017116139W WO 2018214481 A1 WO2018214481 A1 WO 2018214481A1
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WO
WIPO (PCT)
Prior art keywords
light
touch panel
display unit
fingerprint recognition
diverging member
Prior art date
Application number
PCT/CN2017/116139
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English (en)
French (fr)
Inventor
顾品超
董学
王海生
吴俊纬
刘英明
许睿
李昌峰
赵利军
郭玉珍
秦云科
贾亚楠
张平
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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 US16/069,156 priority Critical patent/US10599939B2/en
Publication of WO2018214481A1 publication Critical patent/WO2018214481A1/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
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • 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
    • 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
    • G06V40/1365—Matching; Classification
    • 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
    • H10K59/40—OLEDs integrated with touch screens
    • 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

Definitions

  • Embodiments of the present disclosure relate to the field of touch, and in particular, to a touch panel and a display device.
  • the fingerprint recognition technology developed with it is widely used for personal authentication.
  • the currently applied fingerprint recognition technologies may include: optical imaging, thermal sensors, human body infrared sensors, and the like. How to more accurately identify fingerprint patterns is still the focus of attention in this field.
  • At least one embodiment of the present disclosure provides a touch panel and a display device that at least partially solve the above technical problems.
  • a touch panel including:
  • a display unit comprising a plurality of pixel units
  • a fingerprint recognition sensor disposed on a side of the display unit opposite to the light exiting surface thereof;
  • the display unit further includes at least one via disposed between two adjacent pixel units, and a light diverging member disposed on a side of each of the vias adjacent to the fingerprint recognition sensor, the light diverging member The reflected light for reflecting the light emitted by the pixel unit via the touch body is irradiated onto the fingerprint recognition sensor through the light diverging member.
  • the display unit further includes a source and drain layer and a light shielding member disposed on the source and drain layers, the via hole being formed in the light shielding member.
  • the display unit further includes a source and drain layer, and the via hole is formed in the source and drain layers.
  • the touch panel further includes: the display unit further includes a light shielding member disposed on a side of the via hole away from the fingerprint recognition sensor for guiding reflected light to the via hole .
  • the light diverging member is disposed such that a virtual focus of the light diverging member is located at the via.
  • the display unit further includes a gate insulating layer, and the light emitting member is disposed on the gate insulating layer.
  • the display unit further includes a light collimator disposed between the light diverging member and the fingerprint recognition sensor for collimating divergent light from the light diverging member to Collimated light incident perpendicularly to the fingerprint recognition sensor.
  • the light diverging member includes a microlens.
  • the at least one via includes a plurality of vias, and a pitch H between adjacent vias satisfies the following formula:
  • D object represents the object distance
  • D image represents the image distance
  • ⁇ is the divergence angle of the reflected light by the light diverging member
  • ⁇ is the angle between the incident light and the optical axis of the light diverging member.
  • the spacing H between adjacent via holes is in the range of approximately 1 mm to 5 mm.
  • the via has a diameter in a range of approximately 5 ⁇ m to 50 ⁇ m.
  • a display device including a touch panel according to an embodiment of the present disclosure is provided.
  • the light diverging member in the case where the size and the pitch of the sensor included in the fingerprint recognition sensor are constant, more sensors can be disposed corresponding to a single via hole, and thus the fingerprint can be more accurately recognized.
  • FIG. 1 is a schematic optical path diagram of implementing fingerprint recognition in a display area of a touch panel according to an embodiment of the present disclosure
  • FIG. 2A, 2B, and 2C illustrate schematic plan views of a touch panel in accordance with some example embodiments of the present disclosure
  • FIG. 2D is a schematic cross-sectional view of the touch panel of the exemplary embodiment shown in FIG. 2A along A-A';
  • FIG. 2E is another schematic cross-sectional view of the touch panel of the exemplary embodiment shown in FIG. 2A along A-A';
  • FIG. 2F is still another schematic cross-sectional view of the touch panel of the exemplary embodiment shown in FIG. 2A along A-A';
  • FIG. 3A illustrates a schematic light path diagram of a touch panel implementing fingerprint recognition according to an exemplary embodiment of the present disclosure
  • Figure 3B is a partial enlarged view of the schematic light path shown in Figure 3A;
  • FIG. 4 illustrates a schematic light path diagram of a touch panel implementing fingerprint recognition according to another exemplary embodiment of the present disclosure
  • FIG. 5 illustrates a display device in accordance with an example embodiment of the present disclosure.
  • Fingerprints are invariant features that are unique to a person and can be distinguished from others.
  • the fingerprint can be composed of a series of valleys and ridges on the surface of the skin, and the details of these valleys and ridges determine the uniqueness of the fingerprint pattern.
  • the fingerprint recognition function can be implemented in the display area of the touch panel.
  • FIG. 1 is a schematic diagram of implementing fingerprint recognition in a display area of a touch panel according to an embodiment of the present disclosure.
  • the light emitted by the pixel unit in the display area of the touch panel is reflected by the touch body 110 that is lightly touched or close to the surface of the touch panel.
  • the reflected light L reflect is irradiated onto the fingerprint recognition sensor 130 via at least one via 120, and the reflected light is analyzed by the fingerprint recognition sensor 130, thereby obtaining a surface image of the touch body 110.
  • the surface of the touch body 110 may include a valley 110V and a ridge 110R, and reflected light reflected by the valley 110V of the touch body 110 and the ridge 110R passes through the via 120 and each has a different light. Strong.
  • the fingerprint recognition sensor 130 including, for example, a photosensor can reconstruct a surface image of the touch body 110 by detecting the reflected light and analyzing the intensity of the received reflected light.
  • the fingerprint recognition sensor 130 may include a plurality of sensors 1301 to 130N, N being an integer greater than 1, wherein each via 120 may correspond to at least an effective area distributed within an effective area of area W1 ⁇ W1 One sensor, the larger W1, the greater the number of sensors corresponding to each via 120, the more advantageous the identification of adjacent valleys and ridges in the fingerprint.
  • the layer constituting the object distance D object in FIG. 1 generally includes a cover glass (CG, Cover Glass) in order from the light exit surface to the substrate.
  • a layer an OTP (Optically Clear Adhesive) layer, a Thin Film Encapsulation (TFE) layer, a light-emitting layer, etc., having a total thickness of the order of several hundred micrometers.
  • Image distance D image for example, in FIG. 1 configuration typically comprises a thin film transistor layer and a back plate (BP, Back Plate), a total thickness of about several microns of magnitude. Therefore, the object aperture ratio of the aperture imaging system of Fig.
  • the object distance is 700 m D object
  • an image distance D image is 8 m
  • the object distance image distance ratio D object / D image 87.5, which leads through a single via 120 after reflected light L reflect
  • the effective area of the fingerprint recognition sensor 130 that can be illuminated is small, so the number of sensors corresponding to the single via 120 is small, and the recognition accuracy of adjacent valleys and ridges in the fingerprint is not high.
  • the size of the sensors 1301 to 130N and/or the spacing between adjacent sensors can be reduced, but this increases the process difficulty and increases the production cost.
  • a touch panel including a display unit and a fingerprint recognition sensor for more accurately identifying a fingerprint.
  • the display unit includes a plurality of pixel units.
  • the fingerprint recognition sensor is disposed on a side of the display unit opposite to the light exiting surface thereof.
  • the display unit further includes at least one via disposed between two adjacent pixel units, and a light diverging member disposed on a side of each of the vias adjacent to the fingerprint recognition sensor, the light emitted by the pixel unit being via, for example, a finger
  • the touch body of the class reflects. The reflected light is illuminated by the light diverging member onto the fingerprint recognition sensor.
  • the touch panel 200 may include a display unit 201 including a plurality of pixel units 201P. At least one via 220 is disposed between two adjacent pixel units.
  • 2A shows a case where two adjacent pixel units are adjacent in the horizontal direction and/or in the vertical direction
  • FIG. 2B shows a case where two adjacent pixel units are adjacent in the diagonal direction.
  • two adjacent pixel units in the present disclosure include but are not limited to the above two cases.
  • embodiments of the present disclosure also include any combination of the two above, as shown in FIG. 2C.
  • Fig. 2D is a schematic cross-sectional view of the touch panel of the exemplary embodiment shown in Fig. 2A taken along line A-A'.
  • the touch panel 200 may include a display unit 201 and a fingerprint recognition sensor 230.
  • the display unit 201 includes a plurality of pixel units 201P.
  • the fingerprint recognition sensor 230 is disposed on a side of the display unit 201 opposite to its light exiting surface, such as below the display unit 201 in FIG. 2D.
  • the display unit 201 further includes at least one via 220 disposed between two adjacent pixel units 201P1 and 201P2, and a light diverging member 203 disposed on a side of each of the vias 220 near the fingerprint recognition sensor 230, the pixel fingerprint recognition sensor unit 230 201P emits a touch surface of the reflective body 210, the reflected light L reflect light diverging member 203 is irradiated by light through.
  • the fingerprint recognition sensor 230 analyzes the divergent light L diverge to obtain a surface image of the touch body 210.
  • the surface of the touch body 210 may include a valley 210V and a ridge 210R.
  • Light reflected by the valley 210V and the ridge 210R of the surface of the touch body 210 passes through the light diverging member 203 provided corresponding to the via 220.
  • the divergent light obtained by diverging the reflected light by the light diverging member 203 has different light intensities.
  • the fingerprint recognition sensor 230 detects the divergent light and analyzes the received light intensity of the divergent light to reconstruct a surface image of the touch body 210.
  • the fingerprint recognition sensor 230 may include a plurality of sensors 2301 to 230N', which are integers greater than one.
  • a single via 220 may correspond to at least one sensor distributed within an active area of area W2 x W2. 120 corresponds to a result of 203 pairs of the reflected light L reflect via the light diverging member diverging obtained divergent L diverge, as compared with the example of FIG. 1, the width W2 is greater than W1, the individual over the area of active region 220 corresponding to the hole is larger than a single via effective The area of the area.
  • the size and spacing of the sensors are constant, more sensors can be provided for a single via 220, thus facilitating the identification of adjacent valleys and ridges in the fingerprint.
  • the light-emitting element 2011 is an OLED light-emitting element as an example.
  • the pixel unit 201P may include a light emitting element 2011 and a thin film transistor unit 2012 serving as a switch control.
  • the thin film transistor unit 2012 may include a gate electrode 2012G, a source 2012S, and a drain 2012D.
  • the touch panel 200 may further include a light shielding member 204 disposed above the source and drain layers of the display unit, and a via 220 formed in the light shielding member 204 .
  • the light blocking member 204 can be implemented as a light shielding layer. The light shielding member 204 blocks the reflected light having an excessive reflection angle, and only the reflected light having a small reflection angle can pass through the via hole 220, that is, the reflected light L reflect through the via hole 220 is directed as far as possible to the via hole 220. That part touches the light reflected by the main body, and thus the fingerprint information received by the fingerprint recognition sensor 230 is more accurate, which is beneficial to the judgment of the valley and the ridge of the fingerprint.
  • the material of the light shielding member 204 may be metal or black resin, and of course, other light shielding materials may be used. As shown in FIG. 2D, the light blocking member 204 is disposed to cover the source 2012S and the drain 2012D of the thin film transistor 2012. It will be understood by those skilled in the art that when the light shielding member 204 is implemented using a metal, the light shielding member 204 should be insulated from the adjacent structures of the source and drain layers and the anode of the light emitting element. For example, an insulating layer or an insulating film may be disposed between the light shielding members 204 and 2012S and the drain electrodes 2012D.
  • Fig. 2E shows another schematic cross-sectional view of the touch panel of the exemplary embodiment shown in Fig. 2A along A-A'.
  • the via 220 is formed in the source and drain layers of the display unit in the exemplary embodiment of FIG. 2E.
  • vias 220 are formed in the source and drain layers between two adjacent thin film transistor cells 20121 and 20122.
  • the source, drain, regions with vias, and vias can be formed by one patterning process.
  • the structure of the example embodiment of FIG. 2E that is the same as or similar to FIG. 2D will not be described again.
  • FIG. 2F shows still another schematic cross-sectional view of the touch panel of the exemplary embodiment shown in Fig. 2A taken along line A-A'.
  • the embodiment shown in FIG. 2E is similar, in which the via 220 is formed in the source of the display unit in the example implementation of FIG. 2F In the drain layer.
  • FIG. 2F shows that a via 220 is formed in the drain 2012D of the thin film transistor cell.
  • the source, drain and via can be formed by one patterning process.
  • the structure of the example embodiment of FIG. 2F that is the same or similar to FIG. 2D will not be described again.
  • the touch panel 200 includes a light blocking member 204 disposed on a side of the via 220 away from the fingerprint recognition sensor 230, such as above the source and drain layers, for reflecting Light is directed to the via 220.
  • a light blocking member 204 may of course not be included.
  • the via hole 220 may also be formed in the gate layer of the display unit.
  • a via 220 is formed in the gate layer between two adjacent thin film transistor cells.
  • the touch body 220 may include any object capable of performing touch, such as a finger, a toe, or the like.
  • the touch main body is taken as an example for description.
  • FIG. 3A illustrates a schematic light path diagram of a touch panel implementing fingerprint recognition according to an exemplary embodiment of the present disclosure. Embodiments of the present disclosure will be described in further detail below in conjunction with FIGS. 2D-2F and 3A.
  • the touch surface of the body 310 may include valleys and ridges 310R 310V, 310V light L reflect the valleys 310 and ridges surface of the touch body and passes through the reflection 310R
  • the hole 320 corresponds to the light diverging member 303 provided.
  • the light diverging member 303 diverges the reflected light L reflect .
  • the fingerprint recognition sensor 330 may include a plurality of sensors 3301 to 330N', which are integers greater than one.
  • the single via 320 may correspond to at least one sensor distributed in an effective region of width W2, and the corresponding at least one sensor detects divergence of the reflected light L reflect via the light diverging member 303 to obtain divergent light L diverge .
  • the plurality of sensors 3301 to 330N' can be implemented as a photosensitive sensor.
  • the at least one via 320 may include a plurality of vias having a diameter ranging from several ⁇ m to several tens of ⁇ m, such as from 1 ⁇ m to 100 ⁇ m, or from 5 ⁇ m to 50 ⁇ m. Since the diameter range is sufficiently large, light passing through the via 320 does not diffract. In some embodiments, the plurality of vias can have the same diameter.
  • Fig. 3B shows a partial enlarged view of the schematic light path shown in Fig. 3A.
  • the light diverging member 303 is disposed such that the virtual focus F of the light diverging member 303 is located at the via 320.
  • O is the optical center of the light-diverging member 303
  • OA is the optical axis of the light-diverging member 303
  • the incident light L incident is diffused by the light-diverging member 303 into the outgoing light L emergent at the virtual focus F.
  • the focal length of the light diverging member 303 as long as the incident light can be diverged and the divergent light corresponding to the same via does not overlap on different sensors.
  • the spacing between two adjacent vias is in the range of 1 mm to 5 mm.
  • the larger the pitch of the vias the fewer the number of vias that can be set. If the number of vias is too small, it is difficult to image the entire surface of the touch body, and the excessive number of vias may cause light passing through adjacent vias 320 to overlap on the same sensor, causing signal crosstalk. , resulting in inaccurate detection information.
  • the pitch H of adjacent via holes may satisfy the following relationship:
  • D object represents the object distance
  • D image represents the image distance
  • ⁇ is the divergence angle of the light diverging member 303 to the incident light (ie, the reflected light from the surface of the touch body 310)
  • ⁇ is the clip of the incident light and the optical axis OA. angle.
  • the object distance D object may be a vertical distance from the surface of the touch body to the via hole
  • the image distance D image may be a vertical distance from the via hole to the plane where the fingerprint recognition sensor is located.
  • the via hole can be disposed at any position of the display area according to actual needs.
  • the via holes may be uniformly or unevenly disposed in the display region of the touch panel as shown in FIGS. 2A, 2B, and 2C or in any other form.
  • the light diverging member may include a microlens, which may be formed on the gate insulating layer 202 of the display unit.
  • the microlens may be formed in a gate insulating layer such as in an OLED.
  • touch mask method electron beam direct writing, inkjet printing, ion etching, laser direct writing, imprinting, ion exchange, hot melt, precipitation, etc. can be used to form micro. lens.
  • ion etching After depositing a layer of material required to form the microlens, a photoresist is applied, and then the photoresist is exposed using a mask having a hole shape. Using the positive glue, using the characteristics of the disappearance of the positive gel, the ion-exposed microlens area is ion-etched, and then The concave lens shape is formed by the stepwise property at the time of etching.
  • the microlenses can be formed together with the insulating layer material by sequential patterning. For example, after depositing an insulating layer, the insulating layer material is directly used to form a microlens.
  • the diameter of the microlens may be slightly larger than the diameter of the via such that light passing through the via can enter the microlens.
  • FIG. 4 illustrates a schematic light path diagram of a touch panel implementing fingerprint recognition according to another exemplary embodiment of the present disclosure.
  • the light emitted from the light emitting unit 410 is the touch surface of the body ridges and valleys 410V 410R and the reflected light L reflect light passes through the diverging member disposed in the bore 403 420.
  • the light diverging member 303 diverges the reflected light L reflect , and the divergent light L diverge reaches the plurality of sensors 4301 to 430N' of the fingerprint recognition sensor 430.
  • the plurality of sensors 4301 to 430N' can be implemented as a photosensitive sensor. Reflected light L reflect light through the film layers to the sensor structure 4301 ⁇ 430N 'will be strongly reduced.
  • the reflected light L reflect light through the through hole 420 and the diverging member 403, due to the different incident angles, the light passes through the different incident angles will have different absorption and reflection bore 403 and the light diffusion member 420.
  • the light intensity loss of light incident along the optical axis OA direction of the light-diverging member 403 is the smallest. As the incident angle increases, the light intensity loss incident on the light diverging member 403 is larger.
  • the photosensitive sensor because of the refractive index problem of the surface film medium, when a certain angle of light is irradiated onto the surface of the device, some light will be emitted or refracted, resulting in a decrease in light conversion efficiency.
  • the touch panel 400 may further include a light collimator 450 disposed between the light diverging member 403 and the fingerprint recognition sensor 430. As shown in FIG.
  • the divergent light L diverge incident to the light collimator 450 at different angles is collimated to collimate the collimated light L collimate vertically to the fingerprint recognition sensor 430, and the photosensitive sensor of the fingerprint recognition sensor 430 is received.
  • the light intensity of the light is consistent with the light intensity of the reflected light Lreflect , and at the same time, the divergent light L diverge obtained by the via 420 and the light diverging member 403 is more uniformly irradiated onto the corresponding photosensor.
  • the above-mentioned light collimating member 450 is not necessary.
  • the above-mentioned optical alignment can be omitted.
  • Straight 450 straight 450.
  • FIG. 5 illustrates a display device in accordance with an example embodiment of the present disclosure.
  • the display device 50 includes a touch panel 510 , which is formed, for example, as the touch panel described in the above embodiments.
  • the display device 50 may be any product or component having a display function such as an electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, or the like.
  • the light diverging member in the case where the size of the sensor included in the fingerprint recognition sensor and the pitch of the adjacent sensors are constant, more sensors can be disposed corresponding to the single via hole, and thus can be more accurate Identify the fingerprint.

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Abstract

一种触控面板(200,510)和一种显示装置(50)，触控面板(200,510)包括显示单元(201)，包括多个像素单元(201P)；以及指纹识别传感器(230)，设置在显示单元(201)的与其出光表面相对的一侧，显示单元(201)还包括在两个相邻的像素单元(201P1,201P2)之间设置的至少一个过孔(220)，以及设置在每一个过孔(220)的靠近指纹识别传感器(230)的一侧的光发散构件(203)，光发散构件(203)用于将像素单元(201P)发出的光经由触摸主体(210)反射后的反射光(L reflect)通过光发散构件(203)照射到指纹识别传感器(230)上。

Description

触控面板和显示装置
相关申请的交叉引用
本申请要求于2017年5月23日提交的、申请号为201710371405.X的中国专利申请的优先权，其全部内容通过引用并入本申请中。
技术领域
本公开的实施例涉及触控领域，具体地，涉及一种触控面板和一种显示装置。
背景技术
由于指纹图案的唯一性，随之发展起来的指纹识别技术广泛用于个人身份验证。根据指纹采集、输入的方式不同，目前应用的指纹识别技术可以包括：光学成像、热敏传感器、人体红外传感器等。如何更准确地识别指纹图案仍然是本领域关注的焦点问题。
发明内容
本公开的至少一个实施例提供了一种触控面板和一种显示装置，至少部分地解决了以上技术问题。
根据本公开的一个方面，提出了一种触控面板，包括：
显示单元，包括多个像素单元；以及
指纹识别传感器，设置在所述显示单元的与其出光表面相对的一侧；
所述显示单元还包括在两个相邻的像素单元之间设置的至少一个过孔，以及设置在每一个过孔的靠近所述指纹识别传感器的一侧的光发散构件，所述光发散构件用于将所述像素单元发出的光经由触摸主体反射后的反射光通过光发散构件照射到所述指纹识别传感器上。
根据本公开示例实施例，所述显示单元还包括源漏极层和设置在所述源漏极层上的遮光构件，所述过孔形成在遮光构件中。
根据本公开示例实施例，所述显示单元还包括源漏极层，所述过孔形成在所述源漏极层中。
根据本公开示例实施例，所述触控面板还包括：所述显示单元还包括遮光构件，设置在所述过孔的远离所述指纹识别传感器的一侧，用于将反射光引导至过孔。
根据本公开示例实施例，所述光发散构件被设置为使所述光发散构件的虚焦点位于所述过孔处。
根据本公开示例实施例，所述显示单元还包括栅极绝缘层，所述光发散构件被设置在所述栅极绝缘层。
根据本公开示例实施例，所述显示单元还包括在所述光发散构件和所述指纹识别传感器之间设置有光准直器，用于将来自所述光发散构件的发散光准直化为垂直入射到所述指纹识别传感器的准直光。
根据本公开示例实施例，所述光发散构件包括微透镜。
根据本公开示例实施例，所述至少一个过孔包括多个过孔，相邻过孔之间的间距H满足以下公式：
2×Dimage×tan(α+β)≤H≤2×Dobject×tan(α+β)
其中，Dobject表示物距，Dimage表示像距，α是光发散构件对所述反射光的发散角度，β是入射光与光发散构件的光轴的夹角。
根据本公开示例实施例，相邻过孔之间的间距H在大约1mm～5mm的范围内。
根据本公开示例实施例，所述过孔的直径在大约5μm～50μm的范围内。
根据本公开的另一方面，提供了一种显示装置，包括根据本公开实施例的触控面板。
根据本公开实施例，通过设置光发散构件，在指纹识别传感器包括的传感器的尺寸和间距均不变的情况下，可以对应于单个过孔设置更多的传感器，因此能更准确识别指纹。
附图说明
为了更清楚地说明本公开实施例或现有技术中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本公开的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图，图中：
图1示出了本公开实施例的一种在触控面板的显示区域实现指纹识别的示意光路图；
图2A，图2B和图2C示出了根据本公开一些示例实施例的触控面板的示意平面图；
图2D示出了图2A所示示例实施例的触控面板沿A-A’的一种示意剖面图；
图2E示出了图2A所示示例实施例的触控面板沿A-A’的另一种示意剖面图；
图2F示出了图2A所示示例实施例的触控面板沿A-A’的又一种示意剖面图；
图3A示出了根据本公开示例实施例的触控面板实现指纹识别的示意光路图；
图3B示出了图3A所示示意光路的局部放大图；
图4示出了根据本公开另一个示例实施例的触控面板实现指纹识别的示意光路图；以及
图5示出了根据本公开一个示例实施例的显示装置。
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中的附图，对本公开实施例中的技术方案进行清楚、完整的描述。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。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获得的所有其他实施例都属于本公开保护的范围。应注意，贯穿附图，相同的元素由相同或相近的附图标记来表示。在以下描述中，一些具体实施例仅用于描述目的，而不应该理解为对本公开有任何限制，而只是本公开实施例的示例。在可能导致对本公开的理解造成混淆时，将省略常规结构或构造。应注意，图中各部件的形状和尺寸不反映真实大小和比例，而仅示意本公开实施例的内容。
除非另外定义，本公开实施例使用的技术术语或科学术语应当是本领域技术人员所理解的通常意义。本公开实施例中使用的“第一”、“第二”以及类似词语并不表示任何顺序、数量或重要性，而只是用于区分不同的组成部分。
指纹是个人独一无二并可与他人相区别的不变特征。指纹可以由端皮肤表面上的一系列谷和脊组成，这些谷和脊的细节决定了指纹图案的唯一性。可以在触控面板的显示区域中实现指纹识别功能。
图1示出了本公开实施例的一种在触控面板的显示区域中实现指纹识别的示意图。
如图1所示，触控面板的显示区域中的像素单元发出的光被轻触或接近触控面板表面的触摸主体110反射。利用小孔成像原理，反射光Lreflect经由至少一个过孔120照射到指纹识别传感器130上，由指纹识别传感器130对反射光进行分析，从而得到触摸主体110的表面图像。例如，在触摸主体110是手指的情况下，触摸主体110的表面可以包括谷110V和脊110R，由触摸主体110的谷110V和脊110R反射的反射光经过过孔120，并各自具有不同的光强。因此包括例如光敏传感器的指纹识别传感器130通过检测反射光并分析接收到的反射光的光强可以重构得到触摸主体110的表面图像。根据本公开的一些实施例，指纹识别传感器130可以包括多个传感器1301～130N，N为大于1的整数，其中每个过孔120可以对应于分布在面积为W1×W1的有效区域内的至少一个传感器，W1越大，则与每个过孔120相对应的传感器的数目越多，越有利于指纹中相邻的谷和脊的识别。
然而，以触控面板的像素单元为有机电致发光二极管(OLED)为例，按照从出光面到基板的顺序，构成图1中的物距Dobject的层通常包括盖玻璃(CG，Cover Glass)层、光学胶(OCA，Optically Clear Adhesive)层、薄膜封装(TFE，Thin Film Encapsulation)层、发光层等，总厚度约为数百微米的数量级。例如构成图1中的像距Dimage的层通常包括薄膜晶体管和背板(BP，Back Plate)，总的厚度约为数微米的数量级。因此，图1中小孔成像系统的物距像距比为数十到数百的数量级。例如，在一种实际应用中，物距Dobject为700μm，像距Dimage为8μm，因此物距像距比Dobject/Dimage＝87.5，这导致通过单个过孔120之后的反射光Lreflect能够照射到的指纹识别传感器130的有效区域很小，因此与单个过孔120相对应的传感器的数目较少，对指纹中相邻的谷和脊的识别准确度不高。为了实现单个过孔对应尽可能多的传感器，可以减少传感器1301～130N的尺寸和/或相邻传感器之间的间距，但由此会增大工艺难度并增大生产成本。
为了避免或缓解上述技术问题，本公开的一些实施例提出了一种触控面板，包括显示单元和指纹识别传感器，用于更精确地识别指纹。显示单元包括多个像素单元。指纹识别传感器设置在显示单元的与其出光表面相对的一侧。显示单元还包括在两个相邻的像素单元之间设置的至少一个过孔，以及设置在每一个过孔的靠近指纹识别传感器的一侧的光发散构件，像素单元发出的光经由诸如手指之类的触摸主体反射。反射光通过光发散构件照射到指纹识别传感器上。这样，由于设置有光发散构件，允许对应于单个过孔设置更多的传感器，因此能更准确识别指纹。图2A和2B示出了根据本公开一些示例实施例的触控面板的示意平面图。如图2A所示，根据本公开实施例的触控面板200可以包括显示单元201，显示单元201包括多个像素单元201P。在两个相邻的像素单元之间设置有至少一个过孔220。图2A示出了两个相邻的像素单元是沿水平方向和/或沿垂直方向相邻的情况，图2B示出了两个相邻的像素单元是沿对角方向相邻的情况。本领域技术人员可以理解，本公开中“两个相邻的像素单元”包括但不局限于以上两种情况。此外，本公开实施例还包括以上两种情况的任意组合，如图2C所示。
图2D示出了图2A所示示例实施例的触控面板沿A-A’的一种示意剖面图。如图2D所示，根据本公开实施例的触控面板200可以包括显示单元201和指纹识别传感器230。
根据图示的实施例，显示单元201包括多个像素单元201P。指纹识别传感器230设置在显示单元201的与其出光表面相对的一侧，例如图2D中的显示单元201的下方。显示单元201还包括在两个相邻的像素单元201P1和201P2之间设置的至少一个过孔220，以及设置在每一个过孔220的靠近指纹识别传感器230的一侧的光发散构件203，像素单元201P发出的光经由触摸主体210的表面反射，反射光Lreflect通过光发散构件203照射到指纹识别传感器230上。
指纹识别传感器230对发散光Ldiverge进行分析，从而得到触摸主体210的表面图像。例如，在触摸主体210是手指的情况下，触摸主体210的表面可以包括谷210V和脊210R。由触摸主体210表面的谷210V和脊210R反射的光经过与过孔220相对应设置的光发散构件203。光发散构件203对反射光进行发散得到的发散光具有不同的光强。指纹识别传感器230检测发散光并分析接收到的发散光的光强可以重构得到触摸主体210的表面图像。指纹识别传感器230可以包括 多个传感器2301～230N’，N’为大于1的整数。单个过孔220可以对应于分布在面积为W2×W2的有效区域内的至少一个传感器。由于经由光发散构件203对反射光Lreflect进行发散得到发散光Ldiverge，与图1的示例相比较，宽度W2大于W1，单个过孔220对应的有效区域的面积大于单个过孔120对应的有效区域的面积。由此，在传感器的尺寸和间距均不变的情况下，可以针对单个过孔220设置更多的传感器，因此有利于指纹中相邻的谷和脊的识别。
图2D中以发光元件2011为OLED发光元件为例进行演示。如图2D所示，像素单元201P可以包括发光元件2011和用作开关控制的薄膜晶体管单元2012。薄膜晶体管单元2012可以包括栅极2012G、源极2012S和漏极2012D。本领域技术人员可以理解，图2D中省略了一些本领域公知的结构以便简明。
在图2D所示的示例实施例中，触控面板200还可以包括遮光构件204，遮光构件204设置在所述显示单元的源漏极层上方，过孔220形成在遮光构件204中。在一个实施例中，可以将遮光构件204实现为遮光层。利用遮光构件204遮挡反射角度过大的反射光，仅反射角度较小的反射光才能够通过过孔220，即，通过过孔220的反射光Lreflect是由尽可能正对着过孔220的那部分触摸主体所反射的光，由此指纹识别传感器230接收到的指纹信息更加精准，有利于指纹的谷和脊的判断。遮光构件204的材料可以采用金属或者黑色树脂，当然还可以选用其他遮光材料。如图2D所示，遮光构件204被设置为覆盖薄膜晶体管2012的源极2012S和漏极2012D。本领域技术人员可以理解，当使用金属实现遮光构件204时，应当使遮光构件204与源漏极层以及发光元件的阳极等相邻结构彼此绝缘。例如，可以在遮光构件204与2012S和漏极2012D之间设置绝缘层或绝缘膜。
图2E示出了图2A所示示例实施例的触控面板沿A-A’的另一种示意剖面图。与图2D所示实施例不同的是，在图2E的示例实施例中过孔220形成在显示单元的源漏极层中。在图2E的示例实施例中，在两个相邻的薄膜晶体管单元20121和20122之间的源漏极层中形成过孔220。本领域技术人员可以理解，可以通过一次构图工艺形成源极、漏极、具有过孔的区域和过孔。为了简明，不再赘述图2E的示例实施例中与图2D相同或相近的结构。
图2F示出了图2A所示示例实施例的触控面板沿A-A’的又一种示意剖面图。图2E所示的实施例类似，在图2F的示例实施中过孔220形成在显示单元的源 漏极层中。与图2E的示例实施例不同的是，图2F示出了在薄膜晶体管单元的漏极2012D中形成过孔220。本领域技术人员可以理解，可以通过一次构图工艺形成源极、漏极和过孔。为了简明，不再赘述图2F的示例实施例中与图2D相同或相近的结构。
此外，在图2E和图2F中示出了触控面板200包括遮光构件204，遮光构件204设置在过孔220的远离指纹识别传感器230的一侧，例如源漏极层上方，用于将反射光引导至过孔220。本领域技术人员可以理解，当然也可以不包括遮光构件204。
此外，还可以将过孔220形成在显示单元的栅极层中。例如，在两个相邻的薄膜晶体管单元之间的栅极层中形成过孔220。本领域技术人员可以理解，可以通过一次构图工艺形成栅极、具有过孔的区域和过孔。
根据本公开实施例，触摸主体220可以包括手指、脚趾等任意能够实施触摸的客体。在本实施例中主要是以触摸主体为手指为例进行说明。
图3A示出了根据本公开示例实施例的触控面板实现指纹识别的示意光路图。下文将结合图2D～图2F和图3A来进一步详细描述本公开实施例。如图3A所示，例如，在触摸主体310是手指的情况下，触摸主体310的表面可以包括谷310V和脊310R，由触摸主体310表面的谷310V和脊310R反射的光Lreflect经过与过孔320相对应设置的光发散构件303。光发散构件303对反射光Lreflect进行发散。指纹识别传感器330可以包括多个传感器3301～330N’，N’为大于1的整数。单个过孔320可以对应于分布在宽度为W2的有效区域内的至少一个传感器，对应的至少一个传感器检测经由光发散构件303对反射光Lreflect进行发散得到发散光Ldiverge。可以将多个传感器3301～330N’实现为光敏传感器。
根据本公开实施例，至少一个过孔320可以包括多个过孔，单个过孔的直径为数μm～数十μm的范围内，例如1μm～100μm，或5μm～50μm。由于该直径范围足够大，通过过孔320的光不会发生衍射。在一些实施例中，多个过孔可以具有相同的直径。
图3B示出了图3A所示示意光路的局部放大图。如图3B所示，根据本公开实施例，光发散构件303被设置为使光发散构件303的虚焦点F位于过孔320处。图3B中，O为光发散构件303的光心，OA是光发散构件303的光轴，平 行入射光Lincident经过光发散构件303发散为虚焦点在F处的出射光Lemergent。对于光发散构件303焦距，只要能够将入射光进行发散并且对应于同一过孔的发散光不会在不同传感器上发生交叠即可。
根据本公开实施例，两个相邻过孔之间的间距在1mm～5mm的范围内。过孔的间距越大，则可以设置的过孔的数目越少。如果过孔的数目过少，则难以对完整的触摸主体表面成像，而过孔的数目过多，则可能会导致经过相邻过孔320的光在同一个传感器上发生交叠，造成信号串扰，从而导致检测信息不准确。根据本公开实施例，相邻过孔的间距H可以满足以下关系：
2×Dimage×tan(α+β)≤H≤2×Dobject×tan(α+β)
其中，Dobject表示物距，Dimage表示像距，α是光发散构件303对入射光(即，来自触摸主体310的表面的反射光)的发散角度，β是入射光与光轴OA的夹角。物距Dobject可以是触摸主体的表面到过孔的垂直距离，像距Dimage可以是过孔到指纹识别传感器所处平面的垂直距离。当H≥2×Dimage×tan(α+β)时，可以避免通过不同过孔的光在同一传感器上发生交叠并导致信号串扰。当H≤2×Dobject×tan(α+β)时，则可以保证对整个触摸主体成像。为了使指纹识别传感器中的光敏传感器获得足够大的光量，可以在满足以上公式的情况下设置尽可能多的过孔。
例如，以指纹的面积为20*30mm2为例，当相邻过孔的间距为1mm时，需要设置20×30的孔阵列来实现全指纹识别；当相邻过孔的间距为5mm时，需要设置4×6的孔阵列来实现全指纹识别。此外，本领域技术人员可以理解，可以根据实际需求，将过孔设置在显示区域的任意位置处。也可以如图2A、2B、2C所示或其他任意形式，在触控面板的显示区域中均匀或不均匀地设置过孔。
如图2D～2F所示，根据本公开实施例，光发散构件可以包括微透镜，所述微透镜可以被形成在显示单元的栅极绝缘层202。可以将微透镜形成在例如OLED中的栅极绝缘层。本领域技术人员可以理解，例如可以触式掩模法、电子束直写，喷墨打印法、离子刻蚀、激光直写法、压印成形、离子交换、热熔法、沉淀法等来形成微透镜。以离子刻蚀为例，在沉积完形成微透镜所需的一层材料之后，涂覆光刻胶，然后使用带有孔状的掩膜对光刻胶进行曝光。使用正胶，利用正胶见光显影消失的特性，对光刻胶露出来的微透镜区域进行离子刻蚀，再利 用刻蚀时的台阶性形成凹透镜形状。可以利用依次构图与绝缘层材料一起形成微透镜。例如在沉积一层绝缘层之后，直接利用此层绝缘层材料形成微透镜。微透镜的直径可以稍大于过孔的直径，使得通过过孔的光能够进入微透镜。
图4示出了根据本公开另一个示例实施例的触控面板实现指纹识别的示意光路图。如图4所示，发光单元发出的光被触摸主体410表面的谷410V和脊410R反射，反射光Lreflect经过设置于过孔420中的光发散构件403。光发散构件303对反射光Lreflect进行发散，发散光Ldiverge到达指纹识别传感器430的多个传感器4301～430N’。可以将多个传感器4301～430N’实现为光敏传感器。反射光Lreflect经过各膜层结构到达传感器4301～430N’的光的光强会有所降低。同时，反射光Lreflect经过过孔420和光发散构件403，由于入射角度不同，不同入射角度的光经过过孔420和光发散构件403时会存在不同的反射和吸收。如图4所示，沿光发散构件403的光轴OA方向入射的光的光强损失最小。随着入射角度增大，入射到光发散构件403的光强损失越大。尤其对于光敏传感器，因为表面膜层介质折射率问题，一定角度的光线照射到器件表面后，有部分光线会发生发射或者折射，造成光转化效率降低。这导致过孔420正下方的光敏传感器的光电转换效率高，越偏离该位置的光敏传感器的光电转换效率越低。即入射角度越大，则对应光敏传感器接收到的光的光强损失越大。由于光敏传感器根据所接收的光强差异来判断指纹的谷和脊，会干扰对于指纹的谷和脊的判断。因此，根据本公开实施例，触控面板400还可以包括设置于所述光发散构件403和所述指纹识别传感器430之间的光准直器450。如图4所示，由不同角度的入射至光准直器450的发散光Ldiverge准直化为垂直照射至指纹识别传感器430的准直光Lcollimate，提高指纹识别传感器430的光敏传感器接收到的光的光强与反射光Lreflect的光强的一致性，同时使得经过过孔420和光发散构件403得到的发散光Ldiverge更加均匀的照射到对应的光敏传感器上。但是本领域的技术人员可以理解，上述的光准直构件450不是必须的，例如在需要减小触控面板的厚度并且光敏传感器对光的入射角度不敏感的情况下，可以省略上述的光准直器450。
图5示出了根据本公开一个示例实施例的显示装置。如图5所示，显示装置50包括触控面板510，该触控面板510例如形成为如上述实施例描述的触控面板。
根据本公开实施例的显示装置50可以是电子纸、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
根据本公开实施例，通过设置光发散构件，在指纹识别传感器包括的传感器的尺寸和相邻传感器的间距均不变的情况下，可以对应于单个过孔设置更多的传感器，因此能更准确地识别指纹。
尽管已经参考本公开的典型实施例，具体示出和描述了本公开，但本领域普通技术人员应当理解，在不脱离所附权利要求所限定的本公开的精神和范围的情况下，可以对这些实施例进行形式和细节上的多种改变。

Claims (12)

  1. 一种触控面板，包括：
    显示单元，包括多个像素单元；以及
    指纹识别传感器，设置在所述显示单元的与其出光表面相对的一侧，
    其中，所述显示单元还包括在两个相邻的像素单元之间设置的至少一个过孔，以及设置在每一个过孔的靠近所述指纹识别传感器的一侧的光发散构件，所述光发散构件用于将所述像素单元发出的光经由触摸主体反射后的反射光通过光发散构件照射到所述指纹识别传感器上。
  2. 根据权利要求1所述的触控面板，其中，所述显示单元还包括源漏极层和设置在所述源漏极层上的遮光构件，所述过孔形成在遮光构件中。
  3. 根据权利要求1所述的触控面板，其中，所述显示单元还包括源漏极层，所述过孔形成在所述源漏极层中。
  4. 根据权利要求3所述的触控面板，还包括：所述显示单元还包括遮光构件，设置在所述过孔的远离所述指纹识别传感器的一侧，用于将反射光引导至过孔。
  5. 根据权利要求1-4之一所述的触控面板，其中，所述光发散构件被设置为使所述光发散构件的虚焦点位于所述过孔处。
  6. 根据权利要求1-4之一所述的触控面板，其中，所述显示单元还包括栅极绝缘层，所述光发散构件被设置在所述栅极绝缘层。
  7. 根据权利要求1-4之一所述的触控面板，其中，所述显示单元还包括在所述光发散构件和所述指纹识别传感器之间设置有光准直器，用于将来自所述光发散构件的发散光准直化为垂直入射到所述指纹识别传感器的准直光。
  8. 根据权利要求1-4之一所述的触控面板，其中，所述光发散构件包括微透镜。
  9. 根据权利要求1所述的触控面板，其中，所述至少一个过孔包括多个过孔，相邻过孔之间的间距H满足以下公式：
    2×Dimage×tan(α+β)≤H≤2×Dobject×tan(α+β)
    其中，Dobject表示物距，Dimage表示像距，α是光发散构件对所述反射光的发散角度，β是入射光与光发散构件的光轴的夹角。
  10. 根据权利要求9所述的触控面板，其中，相邻过孔之间的间距H在大约1mm～5mm的范围内。
  11. 根据权利要求1-4之一所述的触控面板，其中，所述过孔的直径在大约5μm～50μm的范围内。
  12. 一种显示装置，包括如权利要求1-11之一所述的触控面板。
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