WO2018145450A1 - 指纹识别模块、指纹识别方法及触控屏 - Google Patents

指纹识别模块、指纹识别方法及触控屏 Download PDF

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Publication number
WO2018145450A1
WO2018145450A1 PCT/CN2017/100467 CN2017100467W WO2018145450A1 WO 2018145450 A1 WO2018145450 A1 WO 2018145450A1 CN 2017100467 W CN2017100467 W CN 2017100467W WO 2018145450 A1 WO2018145450 A1 WO 2018145450A1
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WO
WIPO (PCT)
Prior art keywords
fingerprint
receiving surface
liquid crystal
optical sensor
fingerprint recognition
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PCT/CN2017/100467
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English (en)
French (fr)
Inventor
王海生
赵利军
刘英明
许睿
李昌峰
贾亚楠
郭玉珍
顾品超
秦云科
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 US15/756,168 priority Critical patent/US10509942B2/en
Publication of WO2018145450A1 publication Critical patent/WO2018145450A1/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
    • G06V40/1318—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
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03547—Touch pads, in which fingers can move on a surface
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
    • G02F1/294—Variable focal length devices

Definitions

  • the present disclosure relates to the field of touch technologies, and in particular, to a fingerprint recognition module, a fingerprint recognition method, and a touch screen.
  • Portable terminals are widely used in people's daily life, and the functions of portable terminals are becoming more and more powerful, thereby greatly facilitating users.
  • the portable terminal stores a lot of private information while providing more convenience to the user. If the portable terminal is lost or stolen, the private information may be easily leaked due to lack of relevant protection, thereby giving The user is inconvenient. Therefore, it is necessary to make some privacy settings on the portable terminal.
  • the fingerprint recognition module is usually disposed in a non-visible area of the display panel.
  • the fingerprint recognition module is usually disposed on the home button or on the back of the mobile phone, and fingerprint recognition cannot be performed in the visible area. Because: as shown in Fig. 1, when the optical sensor is integrated in the array substrate, the distance between the contact surface with the finger is large, and a part of the light reflected by the finger cannot be scattered due to scattering. The sensor causes the optical sensor to obscure the formed optical fingerprint pattern due to less received light, thereby affecting the accuracy of fingerprint recognition.
  • the present disclosure provides a fingerprint recognition module, a fingerprint recognition method, and a touch that can realize fingerprint recognition in a visible area and improve fingerprint recognition accuracy. Control screen.
  • a fingerprint identification module including:
  • An optical sensor having a receiving surface configured to receive fingerprint reflected light
  • a lens assembly configured to converge the fingerprint reflected light toward the receiving surface of the optical sensor
  • the lens assembly comprises a liquid crystal lens configured to rotate the liquid crystal molecules at different angles when energized to concentrate the fingerprint reflected light toward the receiving surface of the optical sensor.
  • the liquid crystal lens may include:
  • Two alignment films respectively disposed on two surfaces of the two substrates facing each other with a certain gap therebetween;
  • a liquid crystal layer that is received in the gap A liquid crystal layer that is received in the gap.
  • a central portion of one of the two alignment films may be provided with an opening.
  • the lens assembly may further include a microlens disposed on the receiving surface of the optical sensor and located below the liquid crystal lens, and configured to change the reflected light of the fingerprint relative to the The direction of the oblique light of the surface is received such that it tends to be perpendicular to the receiving surface.
  • a touch screen including
  • a fingerprint recognition module as described above integrated in the display panel and located within a viewable area of the display panel.
  • the display panel may include an array substrate and a color filter substrate disposed on the cartridge;
  • the optical sensor is disposed in the array substrate, and the liquid crystal lens is disposed on the color filter substrate above the array substrate.
  • the lens assembly may further include a microlens disposed on the receiving surface of the optical sensor and located below the liquid crystal lens, and configured to be modified The direction of the light reflected by the fingerprint relative to the receiving surface is changed to be perpendicular to the receiving surface.
  • the number of the optical sensors may be two or more and distributed in an array
  • the number of the microlenses coincides with the number of the optical sensors, and the respective microlenses are disposed in one-to-one correspondence on the receiving surfaces of the respective optical sensors.
  • a fingerprint identification method for performing fingerprint recognition using a fingerprint recognition module as described above, the fingerprint recognition method comprising:
  • Step S1 energizing the liquid crystal lens to rotate the liquid crystal molecules inside thereof by different angles;
  • Step S2 concentrating the fingerprint reflected light toward the receiving surface of the optical sensor via the liquid crystal lens
  • Step S3 The optical sensor receives the fingerprint reflected light.
  • the step S2 may include changing a direction of light reflected in the fingerprint reflected light with respect to the receiving surface using a microlens so as to be perpendicular to the receiving surface.
  • FIG. 1 is a schematic view showing a state in which an optical sensor is integrated in an array substrate of an existing display panel
  • FIG. 2 is a schematic diagram showing a structure of a fingerprint recognition module integrated in a display panel according to an exemplary embodiment of the present disclosure
  • FIG. 3 is a schematic view showing an optical path when an optical sensor receives light of different angles without providing a microlens
  • FIG. 4 is a schematic view showing an optical path when an optical sensor receives light of different angles in a case where a microlens is provided, according to an exemplary embodiment of the present disclosure
  • FIG. 5A is a schematic view showing a structure of a liquid crystal lens when no power is applied, according to an exemplary embodiment of the present disclosure
  • FIG. 5B is a schematic view showing a structure of a liquid crystal lens when energized according to an exemplary embodiment of the present disclosure
  • FIG. 6 is a refractive index of a liquid crystal lens when energized according to an exemplary embodiment of the present disclosure. Distribution.
  • the exemplary embodiment provides a fingerprint identification module integrated in the array substrate 1 of the touch screen and located in the visible area thereof.
  • the fingerprint recognition module includes an optical sensor 6 and a lens assembly, wherein the number of the optical sensors 6 is two or more, and is distributed in an array in the array substrate 1 for receiving the reflected light of the fingerprint and reflecting the received fingerprint.
  • the signal is converted into an electrical signal and sent to the controller, and the controller forms an optical fingerprint pattern according to the electrical signal for the identification operation.
  • the fingerprint reflected light refers to light that is emitted by the light emitted by the display panel and reflected back when the finger touches the protective layer 5 of the display panel of the touch screen.
  • Each of the optical sensors 6 includes a receiving surface 61 for receiving the above-described fingerprint reflected light.
  • the lens assembly is used to concentrate the fingerprint reflected light toward the receiving surface 61 of the optical sensor 6.
  • the lens assembly includes a microlens 7 and a liquid crystal lens 4, wherein the liquid crystal lens 4 is disposed on the color filter substrate 3 and under the protective layer 5 for directing the fingerprint reflected light toward the optical sensor 6.
  • the receiving surface 61 converges.
  • the liquid crystal lens 4 includes two substrates 41 which are oppositely disposed, and two alignment films 42 which are respectively disposed on the two substrates 41. There is a gap between the two surfaces facing and between them; and a liquid crystal layer 43 accommodated in the gap.
  • the alignment film 42 adjacent to the upper substrate 41 has an opening which is located at the center of the alignment film 42.
  • the liquid crystal lens 4 is not energized, the liquid crystal in the liquid crystal layer 43 does not rotate, and is in a state as shown in FIG. 5A, at which time the display panel is normally displayed.
  • fingerprint recognition is required, the liquid crystal lens 4 is energized, and at this time, the liquid crystal is rotated.
  • the opening is present in the alignment film 42, the liquid crystal molecules at different positions are subjected to different electric fields, thereby rotating different angles.
  • the liquid crystal layer 43 is as shown in FIG. 5B. The state shown. In this case, the refractive indices of the liquid crystals at different positions of the liquid crystal lens 4 are different, as shown in FIG.
  • the refractive index at the corresponding opening is the largest, and as the distance from the opening is decreased, the refractive index is gradually decreased, so that the liquid crystal lens 4 is removed. It is possible to function like a convex lens, that is, to condense the fingerprint reflected light toward the receiving surface 61 of the optical sensor 6.
  • the number of the microlenses 7 coincides with the number of the optical sensors 6, and the respective microlenses 7 are disposed one by one on the receiving surface 61 of each of the optical sensors 6 and below the liquid crystal lens 4.
  • the microlens 7 is used to change the direction of the light reflected from the receiving surface 61 among the reflected light of the fingerprint so as to be perpendicular to the receiving surface 61. As shown in FIG. 3, in the case where the microlens is not provided, when the oblique fingerprint reflected light reaches the receiving surface 61 of the optical sensor 6, a part of the light is reflected and refracted because of the problem of the refractive index of the surface film medium.
  • the microlens 7 is provided on the receiving surface 61 of the optical sensor 6, so that the path of the oblique fingerprint reflected light can be optimized as much as possible.
  • the illumination surface 61 is vertically irradiated to reduce the amount of light that is reflected and refracted, thereby improving the light conversion efficiency and uniformity thereof, thereby improving the fingerprint recognition accuracy.
  • the lens assembly includes the microlens 7 and the liquid crystal lens 4, but the present disclosure is not limited thereto. In practical applications, the lens assembly may also be provided with only the microlens 7 or the liquid crystal lens. 4. This also serves to concentrate the fingerprint reflected light toward the receiving surface of the optical sensor 6.
  • the fingerprint recognition module provided by the present disclosure can improve the fingerprint recognition accuracy by means of the lens assembly, even when the fingerprint recognition module according to the present disclosure is integrated in the touch screen and located in the visible area of the touch screen, even when optical When the sensor 7 is integrated in the array substrate 1 and the distance between the contact surface with the finger is large, a clear optical fingerprint pattern can still be obtained to realize fingerprint recognition.
  • the fingerprint identification module may be disposed in any other electronic product having a touch screen, and the disclosure is not particularly limited.
  • the fingerprint recognition module aggregates the fingerprint reflected light toward the receiving surface of the optical sensor by using the lens assembly, which may increase The amount of light reaching the receiving surface of the optical sensor is increased, so that the sharpness of the formed optical fingerprint pattern can be improved, and the fingerprint recognition accuracy can be improved. Even if the fingerprint recognition module provided according to the present disclosure is disposed in the display area of the touch screen, the requirement for fingerprint recognition accuracy can be achieved.
  • an exemplary embodiment of the present disclosure provides a touch screen including a display panel and a fingerprint recognition module, wherein the fingerprint recognition module employs fingerprint recognition according to the first exemplary embodiment of the present disclosure.
  • the touch screen includes an array substrate 1 and a color filter substrate 3 disposed on the cartridge, and a liquid crystal layer 2 is disposed between the array substrate 1 and the color filter substrate 3.
  • the optical sensor 6 is disposed in the array substrate 1.
  • the lens assembly includes a microlens 7 and a liquid crystal lens 4, wherein the liquid crystal lens 4 is disposed on the color filter substrate 3 for condensing the fingerprint reflected light toward the receiving surface 61 of the optical sensor 6 when energized; the microlens 7 is disposed at the optical
  • the receiving surface of the sensor 6 is for changing the direction of the light reflected by the fingerprint relative to the receiving surface 61 so as to be perpendicular to the receiving surface 61. Since the microlens 7 and the liquid crystal lens 4 have been described in detail in the above-described first exemplary embodiment, they will not be described again.
  • the number of the optical sensors 6 is two or more, and is distributed in an array in the array substrate 1, and the number of the microlenses 7 coincides with the number of the optical sensors 6, and the respective microlenses 7 correspond one-to-one. It is disposed on the receiving surface 61 of each optical sensor 6.
  • the optical sensor 6 may also adopt other arbitrary distribution modes, and the respective microlenses 7 are disposed one by one on the receiving surface 61 of each optical sensor 6.
  • a touch screen may integrate a fingerprint recognition module in a display panel and be located in a visible area of the display panel by employing a fingerprint recognition module according to the first exemplary embodiment of the present disclosure, At the same time, the fingerprint recognition accuracy can be ensured, thereby solving the problem that the current fingerprint recognition module can only be set in a non-visible area such as a home button or a back of a mobile phone, or is set in the visible area but the fingerprint recognition accuracy is Limit problem.
  • an exemplary embodiment of the present disclosure provides a fingerprint recognition method that performs fingerprint recognition using a fingerprint recognition module according to a first exemplary embodiment of the present disclosure, the fingerprint recognition method including:
  • Step S1 energizing the liquid crystal lens 4 to rotate the liquid crystal molecules inside thereof at different angles;
  • Step S2 condensing the fingerprint reflected light toward the receiving surface 61 of the optical sensor 6 via the liquid crystal lens 4;
  • Step S3 The optical sensor 6 receives the fingerprint reflected light.
  • the above step S2 may further include changing the direction of the light reflected by the fingerprint surface relative to the receiving surface 61 using the microlens 7 so as to be perpendicular to the receiving surface 61.
  • the fingerprint recognition method can increase the amount of light reaching the receiving surface of the optical sensor by concentrating the fingerprint reflected light toward the receiving surface of the optical sensor, so that the definition of the formed optical fingerprint pattern can be improved In turn, the fingerprint recognition accuracy can be improved. Even if the fingerprint recognition module provided according to the present disclosure is disposed in the display area of the touch screen, the requirement for fingerprint recognition accuracy can be achieved.

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Abstract

本公开提供一种指纹识别模块、指纹识别方法及触控屏。该指纹识别模块包括：光学传感器，其具有构造为接收指纹反射光的接收表面；以及透镜组件，其构造为将指纹反射光朝向光学传感器的接收表面汇聚，其中，透镜组件包括液晶透镜，液晶透镜构造为在通电时使液晶分子旋转不同的角度来将指纹反射光朝向光学传感器的接收表面汇聚。在本公开提供的指纹识别模块、指纹识别方法及触控屏的技术方案中，通过使用透镜组件将指纹反射光朝向光学传感器的接收表面汇聚，可以增加到达光学传感器的接收表面的光线数量，从而可以提高所形成的光学指纹图案的清晰度，进而可以提高指纹识别精度。

Description

指纹识别模块、指纹识别方法及触控屏
相关申请的交叉引用
本申请要求2017年2月10日在中国国家知识产权局提交的中国专利申请No.201710073843.8的优先权，该申请的全部内容以引用方式并入本文。
技术领域
本公开涉及触控技术领域，并且具体地涉及一种指纹识别模块、指纹识别方法及触控屏。
背景技术
便携式终端在人们的日常生活中被广泛应用，并且便携式终端的功能越来越强大，从而极大地方便了用户。但是，便携式终端在为用户提供更多便利的同时，存储了很多的私人信息，如果这种便携式终端一旦丢失或被盗，这些私人信息可能由于没有进行相关的保护而很容易泄漏出去，从而给用户带来不便。因此，在便携式终端上进行一些保密方面的设置显得非常必要。
众所周知，由于指纹的唯一性，让指纹识别技术成为最为安全的生物识别技术之一。因此，越来越多的具有触控屏的便携式终端通过指纹识别来实现保密。目前，指纹识别模块通常设置在显示面板的非可视区域，例如，对于手机来说，指纹识别模块通常设置在home键上或者手机背面，而无法做到在可视区域内实现指纹识别，这是因为：如图1所示，若将光学传感器集成在阵列基板中时，其与手指接触面之间的距离较大，导致被手指反射回来的光线中的一部分光线因发生散射而无法到达光学传感器，从而造成光学传感器因接收到的光线较少，而使形成的光学指纹图案模糊，进而影响指纹识别精度。
发明内容
为了至少部分解决现有技术中存在的技术问题而完成了本公开，本公开提供了一种既可以在可视区域内实现指纹识别又可以提高指纹识别精度的指纹识别模块、指纹识别方法及触控屏。
根据本公开的一个方面，提供了一种指纹识别模块，包括：
光学传感器，其具有构造为接收指纹反射光的接收表面；以及
透镜组件，其构造为将所述指纹反射光朝向所述光学传感器的所述接收表面汇聚，
其中，所述透镜组件包括液晶透镜，所述液晶透镜构造为在通电时使液晶分子旋转不同的角度来将所述指纹反射光朝向所述光学传感器的所述接收表面汇聚。
所述液晶透镜可以包括：
两个基板，其相对地设置；
两张配向膜，其分别设置在所述两个基板的彼此相面对的两个表面上并且之间存在一定间隙；以及
液晶层，其容纳在所述间隙中。
所述两张配向膜中的一张配向膜的中央区域可以设置有开口。
所述透镜组件还可以包括微透镜，所述微透镜设置在所述光学传感器的所述接收表面上且位于所述液晶透镜的下方，并且构造为改变所述指纹反射光中的相对于所述接收表面倾斜的光线的方向，使之趋于与所述接收表面垂直。
根据本公开的另一方面，提供了一种触控屏，包括
显示面板；以及
如上所述的指纹识别模块，其集成在所述显示面板中，且位于所述显示面板的可视区域内。
所述显示面板可以包括对盒设置的阵列基板和彩膜基板；并且
所述光学传感器设置在所述阵列基板中，所述液晶透镜设置在位于所述阵列基板上方的所述彩膜基板上。
所述透镜组件还可以包括微透镜，所述微透镜设置在所述光学传感器的所述接收表面上且位于所述液晶透镜的下方，并且构造为改 变所述指纹反射光中的相对于所述接收表面倾斜的光线的方向，使之趋于与所述接收表面垂直。
所述光学传感器的数量可以为两个以上且呈阵列分布；并且
所述微透镜的数量与所述光学传感器的数量一致，且各个微透镜一一对应地设置在各个光学传感器的所述接收表面上。
根据本公开的又一方面，提供了一种指纹识别方法，其使用如上所述的指纹识别模块进行指纹识别，所述指纹识别方法包括：
步骤S1：对液晶透镜通电以使其内部的液晶分子旋转不同的角度；
步骤S2：经由所述液晶透镜将指纹反射光朝向光学传感器的接收表面汇聚；以及
步骤S3：所述光学传感器接收所述指纹反射光。
所述步骤S2可以包括：使用微透镜改变所述指纹反射光中的相对于所述接收表面倾斜的光线的方向，使之趋于与所述接收表面垂直。
附图说明
图1是示出了将光学传感器集成在现有显示面板的阵列基板中的情况的示意图；
图2是示出了根据本公开的示例性实施例的集成在显示面板中的指纹识别模块的结构的示意图；
图3是示出了在没有设置微透镜的情况下光学传感器接收不同角度的光线时的光路的示意图；
图4是示出了根据本公开的示例性实施例的在设置有微透镜的情况下光学传感器接收不同角度的光线时的光路的示意图；
图5A是示出了根据本公开的示例性实施例的液晶透镜在不通电时的结构的示意图；
图5B是示出了根据本公开的示例性实施例的液晶透镜在通电时的结构的示意图；以及
图6是根据本公开的示例性实施例的液晶透镜在通电时的折射率 分布图。
具体实施方式
为使本领域的技术人员更好地理解本公开的技术方案，下面结合附图来对本公开提供的指纹识别模块、指纹识别方法及触控屏进行详细描述。
第一示例性实施例
根据本公开的一个方面，如图2～图6所示，本示例性实施例提供一种指纹识别模块，该指纹识别模块集成在触控屏的阵列基板1中，且位于其可视区域内。该指纹识别模块包括光学传感器6和透镜组件，其中，光学传感器6的数量为两个以上，且呈阵列分布在阵列基板1中，以用于接收指纹反射光，并将接收到的指纹反射光转换为电信号并发送至控制器，控制器根据该电信号形成光学指纹图案，以进行识别操作。该指纹反射光是指在手指触摸触控屏的显示面板的保护层5时，由显示面板发出的光线照射手指并反射回来的光线。每个光学传感器6均包括用于接收上述指纹反射光的接收表面61。
透镜组件用于将指纹反射光朝向光学传感器6的接收表面61汇聚。在本示例性实施例中，透镜组件包括微透镜7和液晶透镜4，其中，液晶透镜4设置在彩膜基板3上且位于保护层5的下方，用于将指纹反射光朝向光学传感器6的接收表面61汇聚。在本示例性实施例中，如图5A和图5B所示，液晶透镜4包括：两个基板41，其相对地设置；两张配向膜42，其分别设置在这两个基板41的彼此相面对的两个表面上并且之间存在一定间隙；以及液晶层43，其容纳在该间隙中。其中，与上层基板41相邻的配向膜42具有开口，该开口位于配向膜42的中央位置。当液晶透镜4不通电时，液晶层43中的液晶不发生旋转，并且呈如图5A所示的状态，此时显示面板正常显示。当需要进行指纹识别时，对液晶透镜4通电，此时液晶发生旋转，但是由于配向膜42中存在上述开口，因此不同位置处的液晶分子受到不同的电场作用，从而旋转不同的角度，此时液晶层43呈如图5B 所示的状态。在这种情况下，液晶透镜4的不同位置处的液晶折射率不同，如图6所示，对应开口处的折射率最大，且随着远离该开口，折射率逐渐减小，从而液晶透镜4可以起到类似凸透镜的功能，即，将指纹反射光朝向光学传感器6的接收表面61汇聚。
在本示例性实施例中，微透镜7的数量与光学传感器6的数量一致，且各个微透镜7一一对应地设置在各个光学传感器6的接收表面61上且位于液晶透镜4的下方。微透镜7用于改变指纹反射光中的相对于接收表面61倾斜的光线的方向，使之趋于与接收表面61垂直。如图3所示，在没有设置微透镜的情况下，倾斜的指纹反射光在到达光学传感器6的接收表面61上时，因为存在表面膜层介质折射率的问题，因此一部分光线发生反射和折射，从而造成光转换效率降低，同时影响接收表面61所接收的光强的均一性，进而造成光转换效率的均匀性降低。为了解决上述问题，在本示例性实施例中，如图4所示，在光学传感器6的接收表面61上设置微透镜7，这样可以对倾斜的指纹反射光的路径进行优化，使之尽可能垂直地照射在接收表面61上，以减少发生反射和折射的光线的数量，从而提高光转换效率及其均匀性，进而可以提高指纹识别精度。
需要说明的是，在本示例性实施例中，透镜组件包括微透镜7和液晶透镜4，但是本公开并不局限于此，在实际应用中，透镜组件还可以仅设置微透镜7或者液晶透镜4，这同样可以起到将指纹反射光朝向光学传感器6的接收表面汇聚的作用。
由于本公开提供的指纹识别模块借助透镜组件可以提高指纹识别精度，因此在将根据本公开的指纹识别模块集成在触控屏中且位于触控屏的可视区域内的情况下，即使当光学传感器7集成在阵列基板1中且与手指接触面之间的距离较大时，也仍然能够获得清晰的光学指纹图案来实现指纹识别。当然，在实际应用中，指纹识别模块可以设置在具有触控屏的其他任意电子产品中，本公开对此没有特别的限制。
综上所述，根据本公开的示例性实施例的指纹识别模块通过使用透镜组件将指纹反射光朝向光学传感器的接收表面汇聚，这样可以增 加到达光学传感器的接收表面的光线数量，从而可以提高所形成的光学指纹图案的清晰度，进而可以提高指纹识别精度。即使将根据本公开提供的指纹识别模块设置在触控屏的显示区域内，也能够达到对指纹识别精度的要求。
第二示例性实施例
根据本公开的另一方面，本公开的示例性实施例提供一种触控屏，其包括显示面板和指纹识别模块，其中，指纹识别模块采用根据本公开的第一示例性实施例的指纹识别模块，该指纹识别模块集成在显示面板中，且位于该显示面板的可视区域内。
在本示例性实施例中，如图2所示，触控屏包括对盒设置的阵列基板1和彩膜基板3，并且阵列基板1和彩膜基板3之间设置有液晶层2。光学传感器6设置在阵列基板1中。透镜组件包括微透镜7和液晶透镜4，其中，液晶透镜4设置在彩膜基板3上，用于在通电时，将指纹反射光朝向光学传感器6的接收表面61汇聚；微透镜7设置在光学传感器6的接收表面上，用于改变指纹反射光中的相对于接收表面61倾斜的光线的方向，使之趋于与接收表面61垂直。由于微透镜7和液晶透镜4在上述第一示例性实施例中已有了详细描述，所以在此不再赘述。
在本示例性实施例中，光学传感器6的数量为两个以上，且呈阵列分布在阵列基板1中，并且微透镜7的数量与光学传感器6的数量一致，且各个微透镜7一一对应地设置在各个光学传感器6的接收表面61上。但是，本公开并不局限于此，在实际应用中，光学传感器6还可以采用其他任意分布方式，并且各个微透镜7一一对应地设置在各个光学传感器6的接收表面61上。
根据本公开的示例性实施例的触控屏通过采用根据本公开的第一示例性实施例的指纹识别模块，可以将指纹识别模块集成在显示面板中且位于该显示面板的可视区域内，同时又能够保证指纹识别精度，从而解决了目前指纹识别模块只能设置在诸如home键或者手机背面等非可视区域内的问题，或者设置在可视区域内但指纹识别精度有 限的问题。
第三示例性实施例
根据本公开的又一方面，本公开的示例性实施例提供一种指纹识别方法，其使用根据本公开的第一示例性实施例的指纹识别模块进行指纹识别，该指纹识别方法包括：
步骤S1：对液晶透镜4通电以使其内部的液晶分子旋转不同的角度；
步骤S2：经由液晶透镜4将指纹反射光朝向光学传感器6的接收表面61汇聚；以及
步骤S3：光学传感器6接收指纹反射光。
在本示例性实施例中，上述步骤S2还可以包括：使用微透镜7改变指纹反射光中的相对于接收表面61倾斜的光线的方向，使之趋于与接收表面61垂直。
由于微透镜7和液晶透镜4的具体结构和功能在上述第一示例性实施例中已有了详细描述，所以在此不再赘述。
根据本公开的示例性实施例的指纹识别方法通过将指纹反射光朝向光学传感器的接收表面汇聚，这样可以增加到达光学传感器的接收表面的光线数量，从而可以提高所形成的光学指纹图案的清晰度，进而可以提高指纹识别精度。即使将根据本公开提供的指纹识别模块设置在触控屏的显示区域内，也能够达到对指纹识别精度的要求。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (10)

  1. 一种指纹识别模块，包括：
    光学传感器，其具有构造为接收指纹反射光的接收表面；以及
    透镜组件，其构造为将所述指纹反射光朝向所述光学传感器的所述接收表面汇聚，
    其中，所述透镜组件包括液晶透镜，所述液晶透镜构造为在通电时使液晶分子旋转不同的角度来将所述指纹反射光朝向所述光学传感器的所述接收表面汇聚。
  2. 根据权利要求1所述的指纹识别模块，
    其中，所述液晶透镜包括：
    两个基板，其相对地设置；
    两张配向膜，其分别设置在所述两个基板的彼此相面对的两个表面上并且之间存在一定间隙；以及
    液晶层，其容纳在所述间隙中。
  3. 根据权利要求2所述的指纹识别模块，
    其中，所述两张配向膜中的一张配向膜的中央区域设置有开口。
  4. 根据权利要求1所述的指纹识别模块，
    其中，所述透镜组件还包括微透镜，所述微透镜设置在所述光学传感器的所述接收表面上且位于所述液晶透镜的下方，并且构造为改变所述指纹反射光中的相对于所述接收表面倾斜的光线的方向，使之趋于与所述接收表面垂直。
  5. 一种触控屏，包括
    显示面板；以及
    根据权利要求1所述的指纹识别模块，其集成在所述显示面板中，且位于所述显示面板的可视区域内。
  6. 根据权利要求5所述的触控屏，
    其中，所述显示面板包括对盒设置的阵列基板和彩膜基板；并且
    所述光学传感器设置在所述阵列基板中，所述液晶透镜设置在位于所述阵列基板上方的所述彩膜基板上。
  7. 根据权利要求5所述的触控屏，
    其中，所述透镜组件还包括微透镜，所述微透镜设置在所述光学传感器的所述接收表面上且位于所述液晶透镜的下方，并且构造为改变所述指纹反射光中的相对于所述接收表面倾斜的光线的方向，使之趋于与所述接收表面垂直。
  8. 根据权利要求7所述的触控屏，
    其中，所述光学传感器的数量为两个以上且呈阵列分布；并且
    所述微透镜的数量与所述光学传感器的数量一致，且各个微透镜一一对应地设置在各个光学传感器的所述接收表面上。
  9. 一种指纹识别方法，其使用根据权利要求1所述的指纹识别模块进行指纹识别，所述指纹识别方法包括：
    步骤S1：对液晶透镜通电以使其内部的液晶分子旋转不同的角度；
    步骤S2：经由所述液晶透镜将指纹反射光朝向光学传感器的接收表面汇聚；以及
    步骤S3：所述光学传感器接收所述指纹反射光。
  10. 根据权利要求9所述的指纹识别方法，
    其中，所述步骤S2包括：使用微透镜改变所述指纹反射光中的相对于所述接收表面倾斜的光线的方向，使之趋于与所述接收表面垂直。
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