WO2019196120A1 - 一种屏下指纹识别终端 - Google Patents

一种屏下指纹识别终端 Download PDF

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Publication number
WO2019196120A1
WO2019196120A1 PCT/CN2018/083106 CN2018083106W WO2019196120A1 WO 2019196120 A1 WO2019196120 A1 WO 2019196120A1 CN 2018083106 W CN2018083106 W CN 2018083106W WO 2019196120 A1 WO2019196120 A1 WO 2019196120A1
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WO
WIPO (PCT)
Prior art keywords
light
axis
display screen
material layer
blocking material
Prior art date
Application number
PCT/CN2018/083106
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English (en)
French (fr)
Inventor
林娇
蔡奇
彭旭
Original Assignee
华为技术有限公司
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.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2018/083106 priority Critical patent/WO2019196120A1/zh
Priority to CN201880004449.1A priority patent/CN110036393B/zh
Publication of WO2019196120A1 publication Critical patent/WO2019196120A1/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
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition

Definitions

  • the present application relates to the field of terminal technologies, and in particular, to a screen fingerprint identification terminal.
  • the fingerprint detection under the screen that is, the fingerprint detection module is placed under the display screen, as shown in FIG. 1 , the user places the finger on the display screen above the fingerprint detection module to realize fingerprint detection.
  • the fingerprint detection module can be attached to the bottom of the display screen by means of face-to-face or frame-sticking.
  • 2 is a schematic view of the fingerprint detection module frame attached to the bottom of the display screen.
  • the FP module is attached to the display screen through an adhesive layer placed at the frame of the FP module.
  • FIG. 3 is a schematic view of the fingerprint detecting module attached to the bottom of the display screen. As shown in the figure, the FP module is completely adhered to the display through the adhesive layer.
  • the display screen When the display screen is exposed to strong ambient light, part of the light reflected by the FP module can be emitted through the display screen.
  • the frame-mounting method since there is an air layer between the FP module and the display screen, when the ambient light is strong, the human eye can observe that the FP module has a shadow.
  • the optical-based FP module is coated with an infrared reflective film, when the ambient light is strong, the human eye can observe the position of the FP module in purple, and has obvious color difference with other positions of the display screen. .
  • the user can observe that the location of the FP module is significantly different from the other positions of the display screen, it will affect the aesthetics of the terminal.
  • the embodiment of the present application provides a screen fingerprint recognition terminal, which can prevent the user from observing the difference between the location of the fingerprint module on the display screen and other locations.
  • the embodiment of the present application further provides a terminal, where the terminal includes: a display screen, a light blocking material layer, and a fingerprint module.
  • the display screen includes a display surface and a non-display surface; one side of the light blocking material layer is disposed toward the non-display surface of the display screen, and the other surface of the light blocking material layer is disposed toward the fingerprint module;
  • the light blocking material layer is configured to prevent the first reflected light from exiting through the display screen, and the first reflected light is light reflected by the surface of the fingerprint module when the light is incident on the surface of the fingerprint module.
  • the light blocking material layer is added, the first light is effectively prevented from being emitted, thereby preventing the user from observing the color difference between the position of the fingerprint module and other positions on the display screen, thereby improving the user experience.
  • the light blocking material layer comprises a linear polarizing plate and a quarter wave plate; one side of the linear polarizing plate is disposed toward a non-display surface of the display screen, and the linear polarizing plate is The other side is disposed toward the quarter-wave plate; one side of the quarter-wave plate is disposed toward the linear polarizing plate, and the other side of the quarter-wave plate is disposed toward the fingerprint module.
  • the linearly polarized light after passing through the linear polarizing plate is irradiated onto the surface of the fingerprint module through the quarter wave plate, and the light after passing through the quarter wave plate after being reflected by the surface of the fingerprint module is still linearly polarized light, but The direction of vibration changes, and it cannot pass through linearly polarized light, that is, it can no longer pass through the display screen, thereby avoiding the fingerprint module being observed by the user.
  • the linear polarizing plate allows the direction of polarization of the transmitted light to be at an angle of 45 to the optical axis of the quarter-wave plate.
  • the light blocking material layer further includes: a phase compensation sheet for phase compensation of the first incident light, such that the incident light is compensated by the phase compensation sheet and the outgoing light is linearly polarized light.
  • the first incident light is light incident through a display surface of the display screen; the phase compensation sheet is disposed between the linear polarizer and the display screen.
  • the phase compensation sheet phase compensates the first incident light passing through the display screen, so that more light can pass through the linear polarizing plate, that is, sufficient light is irradiated onto the surface of the fingerprint module, thereby being better. Ensure fingerprint recognition performance of optical-based fingerprint modules.
  • the angle between the fast axis and the x-axis of the phase compensation sheet, the phase difference of the first incident ray on the x-axis and the y-axis, and the phase compensation sheet on the fast axis and the slow axis satisfies the following formula:
  • the first incident light is a light incident on the phase compensation sheet through a display screen;
  • ⁇ represents an angle between a fast axis and an x-axis of the phase compensation sheet, and ⁇ represents a vibration direction of the first outgoing light
  • An angle with the x-axis that is, an angle between the direction of vibration of the light that the linear polarizing plate allows to pass, and the x-axis, Indicates the phase of the first incident ray on the x-axis and the y-axis, respectively.
  • the x axis and the y axis are preset mutually orthogonal coordinate axes, and the plane formed by the x axis and the y axis is parallel to the display screen shown.
  • phase difference of the first incident ray on the x-axis and the y-axis, and the phase difference of the phase compensation plate on the fast axis and the slow axis satisfy the following formula:
  • n is an integer.
  • the phase compensation patch is a quarter wave plate.
  • the fingerprint module is an ultrasonic-based fingerprint module
  • the material of the light-blocking material layer is a material having absorption characteristics for light.
  • the layer of light blocking material is placed between the display screen and the fingerprint module by lamination or coating.
  • the display screen is an organic light emitting diode OLED hard screen.
  • the display screen is an OLED flexible screen; the support layer in the OLED flexible screen is replaced by the light blocking material layer; the light blocking material layer is fixed to the OLED flexible by a coating method On the screen.
  • the light blocking material layer is fixed on the OLED flexible screen by coating, which can support other components of the flexible display screen, thereby eliminating the support layer in the OLED flexible display screen and simplifying the OLED.
  • the structure of the flexible screen is fixed on the OLED flexible screen by coating, which can support other components of the flexible display screen, thereby eliminating the support layer in the OLED flexible display screen and simplifying the OLED.
  • FIG. 1 is a schematic diagram of a screen fingerprint detecting terminal according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a fingerprint detection module frame attached to a lower surface of a display screen according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a fingerprint detecting module attached to the bottom of a display screen according to an embodiment of the present application
  • FIG. 4 is a schematic structural diagram of a display screen, a light blocking material layer, and a fingerprint module in a terminal according to an embodiment of the present disclosure
  • FIG. 5 is a second schematic structural diagram of a display screen, a light blocking material layer and a fingerprint module in a terminal according to an embodiment of the present disclosure
  • FIG. 6 is a schematic diagram of light rays corresponding to the structure shown in FIG. 5 according to an embodiment of the present application.
  • FIG. 7 is a third schematic structural diagram of a display screen, a light blocking material layer and a fingerprint module in a terminal according to an embodiment of the present disclosure
  • FIG. 8 is a schematic diagram of light rays corresponding to the structure shown in FIG. 7 according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of ⁇ and ⁇ provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an OLED flexible screen, a light blocking material layer, and a fingerprint module according to an embodiment of the present application;
  • FIG. 11 is a schematic structural diagram of an OLED hard screen, a light blocking material layer, and a fingerprint module according to an embodiment of the present application.
  • fingerprint recognition technology Since fingerprint recognition technology is relatively mature, with the advantages of high security, fast recognition speed, high recognition success rate, fingerprint recognition technology has been widely used in intelligent terminals. The user can replace the password input by fingerprint recognition, and complete the operation of unlocking the display screen and paying.
  • the fingerprint detector may be disposed on the front panel of the terminal or on the rear panel of the terminal. The user can select the front fingerprint recognition terminal or the rear fingerprint recognition terminal according to his own operating habits.
  • the screen ratio is the ratio of the area of the screen to the front panel of the terminal.
  • a higher screen ratio provides a better visual experience for the user. Therefore, the higher the screen ratio, the more popular the consumer.
  • the designer proposes to set the fingerprint detector under the display panel, that is, the fingerprint detection under the screen, the user can pass Fingerprint is achieved by placing your finger on the display.
  • the display screen when the display screen is exposed to strong ambient light, if ambient light is transmitted through the display screen to the fingerprint module, the light reflected by the fingerprint module is emitted through the display screen, and the position of the fingerprint module can be observed by the human eye.
  • the difference with other locations reduces the aesthetics of the terminal and gives the user a poor experience.
  • the embodiment of the present application provides a terminal for fingerprint detection based on the screen.
  • the terminal is subjected to intense illumination, the light that passes through the display screen and is reflected by the fingerprint module is then emitted through the display screen. Therefore, the user is not easy to observe the color difference between the location of the fingerprint module and other positions of the display screen, thereby improving the aesthetics of the terminal and providing a better user experience for the user.
  • the terminal involved in the embodiment of the present invention may include a mobile phone, a tablet computer, a personal digital assistant (PDA), and the like.
  • PDA personal digital assistant
  • the terminal includes a display screen 41, a light blocking material layer 42 and a fingerprint module 43.
  • the light blocking material layer 42 is disposed between the display screen 41 and the fingerprint module 43.
  • the display screen 41 includes a display surface and a non-display surface, and the light blocking material layer 42 is disposed on the non-display surface of the display screen.
  • the light blocking material layer 42 is configured to prevent the first reflected light from exiting through the display screen 41, wherein the first reflected light is incident light that is incident on the fingerprint module 43.
  • the fingerprint module may include an optical-based fingerprint module, an ultrasound-based fingerprint module, a fingerprint module based on capacitance recognition, and the like according to different fingerprint collection principles.
  • the optical-based fingerprint module further includes a fingerprint module that uses visible light to collect fingerprints and a fingerprint module that uses infrared light to collect fingerprints.
  • Capacitive identification fingerprint sensors cannot be screened or screened due to penetrating power limitations.
  • the screen-on-screen or in-screen fingerprint recognition devices commonly used in terminals are mainly optical-based fingerprint modules and ultrasonic-based fingerprint modules.
  • the light blocking material layer 42 may be made of a material that has absorption properties for light.
  • the terminal is exposed to ambient light, after the ambient light is emitted through the display screen 41, most of the light can be absorbed by the light blocking material layer 42, thereby blocking most of the light from being irradiated onto the fingerprint module and reflecting, thereby reducing the first reflected light.
  • the display through the display screen 41 causes the user to observe the color difference between the location of the fingerprint module and other positions on the display screen, thereby improving the user experience.
  • the light-blocking material layer 42 will block most of the light from being irradiated onto the fingerprint module, and the fingerprint module may not be able to collect the fingerprint.
  • the light blocking material layer 42 may include a linear polarizing plate 420 and a quarter wave plate 421 in order to ensure that the performance of the fingerprint module is not affected and at the same time reduce the user's visual perception of the fingerprint module. As shown in FIG.
  • one side of the linear polarizing plate 420 is disposed toward the non-display surface of the display screen 41, and the other surface is disposed toward the quarter-wave plate 421; one side of the quarter-wave plate 421 is disposed toward the linear polarizing plate 420, The other side is disposed toward the fingerprint module 43.
  • the linear polarizing plate 420 allows only light having a vibration plane in a specific direction to pass through the linear polarizing plate 420, and light having a vibration direction in other directions cannot pass through the linear polarizing plate 420.
  • the quarter-wave plate 421 has the following characteristics: if the linearly polarized light is incident on the quarter-wave plate, and the vibration direction is at an angle of 45° to the optical axis of the quarter-wave plate, the quarter wave is The light emitted by the sheet is circularly polarized light; conversely, the circularly polarized light passes through the quarter-wave plate and becomes linearly polarized light.
  • the direction of the light vibration allowed by the linear polarizing plate 420 and the optical axis of the quarter wave plate 421 can be set as 45 as possible, and then the line is passed.
  • the linearly polarized light 1 (shown in FIG. 6) behind the polarizing plate 420 is circularly polarized light 2 after passing through the quarter-wave plate 421.
  • the circularly polarized light is irradiated onto the surface of the fingerprint module, and the reflected light is still circularly polarized light 3. After the reflected circularly polarized light 3 passes through the quarter wave plate 421 again, it becomes linearly polarized light 4.
  • the linearly polarized light 4 is obtained by the two quarter-wave plate 421, the linearly polarized light 4 obtained at this time is rotated by 90° in the vibration direction as compared with the linearly polarized light 1.
  • the linearly polarizing plate 420 allows only the direction of vibration to pass through the light perpendicular to the screen. Since the vibration direction of the linearly polarized light 4 is parallel to the screen, the linearly polarized light 4 can no longer be transmitted through the linear polarizing plate 420.
  • the light blocking material layer 42 composed of the linear polarizing plate 420 and the quarter wave plate 421 can prevent the reflected light passing through the fingerprint module from being emitted through the display screen, thereby preventing the user from observing the position of the fingerprint module and the display screen. Color differences in other locations improve the aesthetics of the terminal.
  • the light blocking material layer 42 includes the design of the linear polarizing plate 420 and the quarter wave plate 421, and can also be applied to an ultrasonic based fingerprint module or other fingerprint module.
  • the light blocking material layer 42 may include a phase compensation sheet 422 including a linear polarizing plate 420 and a quarter wave plate 421, and the phase compensation sheet 422 is disposed on the linear polarizing plate 420 and the display.
  • the first incident light incident on the phase compensation sheet 422 after passing through the display screen 41 is phase-compensated, so that the first outgoing light after the first incident light passes through the phase compensation sheet 422 can pass through the linear polarizing film.
  • the linearly polarized light of 420 ensures that sufficient light can be transmitted to the fingerprint module 43 through the linear polarizing plate 420, so that the fingerprint module 43 can collect valid fingerprint information.
  • the structure of the display screen 41, the light blocking material layer 42 and the fingerprint module 43 may be as shown in FIG. 7 , and the display screen 41 , the phase compensation sheet 422 , the linear polarizing sheet 420 , and the like, from top to bottom. Quarter wave plate 421.
  • the light 81 (i.e., the first incident light) after passing through the display screen 41 is usually circularly polarized light or elliptically polarized light. If circularly polarized light or elliptically polarized light is directly incident on the linear polarizing plate, only a small amount of light can pass.
  • a phase compensation sheet 422 is added between the display screen 41 and the linear polarization plate 420. As shown in FIG. 8, the phase compensation sheet 422 can phase compensate the light 81 so as to be emitted from the phase compensation sheet 422.
  • the ray 82 (i.e., the first outgoing ray) is linearly polarized light, and the direction of vibration of the ray 82 is the direction of vibration through which the linearly polarizing plate 420 is allowed to pass.
  • the light 83 after the light 82 passes through the linear polarizer 420 is still linearly polarized, and the direction of vibration does not change.
  • the light 84 after the light 83 passes through the quarter wave plate 421 becomes circularly polarized light, and the light 85 (ie, the first reflected light) reflected by the circularly polarized light through the surface of the fingerprint module is still circularly polarized light.
  • the light 86 after the light wave 85 passes through the quarter wave plate 421 becomes linearly polarized light, but the linearly polarized light 86 is obtained by the two quarter wave plate 421, so that the linear polarized light 86 and the linear polarization obtained at this time are obtained.
  • the light 83 is rotated by 90° in comparison with the light 83, and the linearly polarized light 86 rotated by 90° in the vibration direction can no longer be transmitted through the linear polarizing plate 420.
  • the phase compensation sheet 422 is added to phase compensate the light 81 passing through the display screen 41, the phase-compensated light can smoothly pass through the linear polarizing plate 420, thereby ensuring sufficient illumination to the fingerprint mode.
  • the performance of the fingerprint module is not affected; in addition, the light reflected by the surface of the fingerprint module becomes linearly polarized due to the passage of the quarter wave plate 421 again, but the vibration direction is rotated by 90° and cannot be passed again.
  • Linear polarizing plate 420 The light that has been blocked by the fingerprint module is prevented from passing through the display screen, and the user is prevented from observing the color difference between the position of the fingerprint module and other positions of the display screen, thereby improving the aesthetics of the terminal.
  • the outgoing light ray 82 is linearly polarized light, and the angle between the x-axis of the vibration direction of the linearly polarized light is ⁇ (here, the corresponding angle and vibration are rotated counterclockwise by the x-axis)
  • the direction coincides as an example), as shown in Figure 9;
  • the ray 81 and the phase on the x-axis are
  • the phase on the y-axis is
  • the x-axis and the y-axis are preset mutually orthogonal coordinate axes, and the plane formed by the x-axis and the y-axis is parallel to the display screen; for convenience calculation, the width direction of the display screen may be set to the x-axis,
  • the length of the display is set to the y-axis (as shown in Figure 1).
  • the light ray 82 after passing through the phase compensation sheet 422 can be expressed by the formula (1).
  • the phase compensating piece 422 is ⁇ (here, the x-axis rotates counterclockwise and the corresponding angle coincides with the vibration direction as an example), as shown in FIG. 9, the phase compensating piece is in the fast axis direction.
  • the phase produced is
  • the phase produced in the slow axis direction is Then formula (1) can be converted into formula (2).
  • the parameters of the phase compensation sheet 422 can satisfy the formula (3), the light 82 emitted through the phase compensation sheet 422 can be linearly polarized.
  • the phase compensation sheet 422 can be realized by a quarter wave plate.
  • the display screen is an organic light emitting diode (OLED) flexible screen
  • the display screen, the light blocking material layer, and the fingerprint module can be as shown in FIG.
  • the display screen 101 may include a cover glass (CG) 1011, an optically clear adhesive (OCA) 1012, a linear polarizing plate 1013, a quarter wave plate 1014, a touch panel 1015, and a light emitting layer. 1016. Support layer (or back plate) 1017.
  • the glass cover 1011 is used for protecting the display screen, and does not affect the optical path, the polarization type of the light, the phase, and the like.
  • the linear polarizing plate 1013 allows the vibrating surface of the light to transmit light in a fixed direction.
  • the quarter wave plate 1014 converts the incident linearly polarized light into circularly polarized light.
  • the touchpad 1015 is used to detect a user's touch operation without affecting the optical path, the polarization type of the light, the phase, and the like.
  • the luminescent layer 1016 is used for illuminating, but for external ambient light, the luminescent layer does not affect the optical path, the polarization type, phase, and the like of the light.
  • a support layer 1017 is used to support the display screen.
  • the light-blocking material layer 102 composed of the phase compensation sheet 1021, the linear polarizing plate 1022, and the quarter-wave plate 1023 is bonded to the non-display surface of the display screen 101 through the adhesive layer 1, and passes through
  • the adhesive layer 2 is attached to the fingerprint module 103.
  • the adhesive may be a room temperature vulcanized silicone rubber (RTV), or an optically clear adhesive (OCA) may be used.
  • the position of the display screen 101 and the light blocking material layer 102 can be fixed by coating, so that the adhesive layer 1 in FIG. 10 can be omitted; the display screen 101 and the light blocking material layer can also be realized by coating.
  • the position of 102 is fixed, and the adhesive layer 2 in Fig. 10 can be omitted.
  • phase compensation sheet 1021 and the linear polarizing plate 1022 may be fixed by adhesive bonding or by coating; the linear polarizing plate 1022 and the quarter wave plate 1023 may also be bonded.
  • the agent is attached or fixed by means of coating.
  • the light blocking material layer 102 can serve to support the display sheet 101, thereby eliminating the support in the display screen 101.
  • Layer 1017 is used to reduce the thickness of display screen 101.
  • the display screen 111 may include a glass cover plate 1111, an adhesive layer 1112, a linear polarizing plate 1113, a quarter wave plate 1114, an encap glass 1115, and a low temperature poly-silicon (LTPS) 1116.
  • the glass cover plate 1111, the adhesive layer 1112, the sealing glass 1115, and the low temperature polysilicon 1116 do not affect the polarization type, phase, and the like of the light.
  • the light-blocking material layer 112 composed of the phase compensation sheet 1121, the linear polarizing plate 1122, and the quarter-wave plate 1123 is bonded to the non-display surface of the display screen 111 through the adhesive layer 1, and passes through
  • the adhesive layer 2 is attached to the fingerprint module 113.
  • the adhesive can be RTV or OCA can be used.
  • the position of the display screen 111 and the light blocking material layer 112 is also fixed by coating, so that the adhesive layer 1 in FIG. 11 can be omitted; in addition, the display screen 111 can be realized by coating.
  • the position of the light blocking material layer 112 is fixed, and the adhesive layer 2 in Fig. 11 can be omitted.
  • the light blocking material layer 112 may also be disposed between the sealing glass 1115 and the low temperature polysilicon 1116. Since the sealing glass 1115 and the low temperature polysilicon 1116 have no effect on the light transmission, the light blocking material layer 112 is placed between the sealing glass 1115 and the low temperature polysilicon 1116, and still can block the light reflected by the fingerprint module, thereby avoiding The user observes the color difference between the location of the fingerprint module and other locations on the display.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) including computer usable program code.

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Abstract

一种屏下指纹识别终端。该终端包括：显示屏、阻光材料层、指纹模组；其中，显示屏包括显示面和非显示面；阻光材料层的一面朝向显示屏的非显示面设置，阻光材料层的另一面朝向指纹模组设置；阻光材料层用于阻止照射到指纹模组表面并反射的光线经过显示屏出射。在该终端中，由于增加了阻光材料层，有效阻止了照射到指纹模组表面并反射的光线经过显示屏出射，从而避免了用户观察到指纹模组所在位置与显示屏上其他位置之间的颜色差异，提高了用户体验。

Description

一种屏下指纹识别终端 技术领域
本申请涉及终端技术领域，尤其涉及一种屏下指纹识别终端。
背景技术
近年来，具有较高的屏占比(屏幕与终端前面板的面积之比)的智能终端正逐渐成为市场上的主流产品。为了在保证较高屏占比的同时，兼顾习惯于前置指纹识别用户的使用习惯，屏下指纹检测技术提供了一种解决方案。
屏下指纹检测，即，将指纹检测模组置于显示屏幕的下方，如图1所示，用户将手指置于指纹检测模组上方的显示屏上，即可实现指纹检测。指纹检测模组可以通过面贴或框贴的方式贴合在显示屏幕的下方。图2为指纹检测模组框贴于显示屏幕下方的示意图，如图所示，FP模组通过置于FP模组边框处的粘合层与显示屏幕贴合。图3为指纹检测模组面贴于显示屏幕下方的示意图，如图所示，FP模组通过粘合层与显示屏完全贴合。
当显示屏幕受到强烈的环境光照射时，经FP模组反射后的光线部分能够透过显示屏幕射出。对于框贴方式，由于FP模组与显示屏幕之间存在空气层，因此，在环境光强烈时，人眼能够观察到FP模组位置有阴影。对于面贴方式，由于基于光学的FP模组上镀有红外反射膜，因此，在环境光强烈时，人眼能够观察到FP模组位置的呈现紫红色，与显示屏幕的其他位置有明显色差。
若用户能够观察到FP模组位置与显示屏幕的其他位置有明显区别，将会影响终端的美观性。
发明内容
本申请实施例提供了一种屏下指纹识别终端，该终端能够避免用户观察到显示屏上指纹模组所在位置与其他位置的差别。
第一方面，本申请实施例还提供了一种终端，该终端包括：显示屏、阻光材料层以及指纹模组。
其中，显示屏包括显示面和非显示面；所述阻光材料层的一面朝向所述显示屏的非显示面设置，所述阻光材料层的另一面朝向所述指纹模组设置；所述阻光材料层用于阻止第一反射光线经过所述显示屏出射，第一反射光线为当光线入射到指纹模组的表面上时，被指纹模组的表面反射出来的光线。
在该终端中，由于增加了阻光材料层，有效阻止了第一光线的出射，从而避免了用户观察到指纹模组所在位置与显示屏上其他位置之间的颜色差异，提高了用户体验。
在一种可能的设计中，所述阻光材料层包括线偏振片和四分之一波片；所述线偏振片的一面朝向所述显示屏的非显示面设置，所述线偏振片的另一面朝向所述四分之一波片设置；所述四分之一波片的一面朝向所述线偏振片设置，所述四分之一波片的另一面朝向所述指纹模组设置。
经过线偏振片后的线偏振光，经过四分之一波片照射到指纹模组表面，经过指纹模组表面反射后再次经过四分之一波片后的光线，依然为线偏振光，但振动方向改变，无法在 通过线偏振光，即，无法再经过显示屏出射，从而避免了被用户观察到指纹模组。
在一种可能的设计中，所述线偏振片允许透过的光线的偏振方向，与所述四分之一波片的光轴夹角为45°。
在一种可能的设计中，所述阻光材料层还包括：相位补偿片，用于对第一入射光线进行相位补偿，使得入射光线经过所述相位补偿片补偿后的出射光线为线偏振光线，所述第一入射光线为通过所述显示屏的显示面入射的光线；所述相位补偿片置于所述线偏振片和所述显示屏之间。上述设计中，相位补偿片对经过显示屏后的第一入射光线进行相位补偿，以使较多的光线能够通过线偏振片，即，有充足的光线照射到指纹模组表面，从而较好的保证基于光学的指纹模组的指纹识别性能。
在一种可能的设计中，所述相位补偿片的快轴与x轴之间的夹角，第一入射光线在x轴、y轴上的相位差，以及相位补偿片在快轴、慢轴上的相位差，满足下述公式：
Figure PCTCN2018083106-appb-000001
其中，所述第一入射光线为经过显示屏入射到所述相位补偿片的光线；α表示所述相位补偿片的快轴与x轴之间的夹角，θ表示第一出射光线的振动方向与x轴之间的夹角，即，所述线偏振片允许通过的光线的振动方向与x轴之间的夹角，
Figure PCTCN2018083106-appb-000002
表示第一入射光线分别在x轴、y轴上的相位，
Figure PCTCN2018083106-appb-000003
表示第相位补偿片在快轴、慢轴上的相位，x轴和y轴为预设的相互正交的坐标轴，x轴与y轴构成的平面平行于所示显示屏。
在一种可能的设计中，所述相位补偿片的快轴与x轴之间的夹角α＝0；
第一入射光线在x轴、y轴上的相位差，以及相位补偿片在快轴、慢轴上的相位差满足下述公式：
Figure PCTCN2018083106-appb-000004
其中，m为整数。
在一种可能的设计中，所述相位补偿片为四分之一波片。
在一种可能的设计中，所述指纹模组为基于超声波的指纹模组，上述阻光材料层的材料为对光线具有吸收特性的材料。
在一种可能的设计中，上述阻光材料层通过贴合或镀膜置于所述显示屏和所述指纹模组之间。
在一种可能的设计中，所述显示屏为有机发光二极管OLED硬屏。
在一种可能的设计中，所述显示屏为OLED柔性屏；所述OLED柔性屏中的支撑层由所述阻光材料层替换；所述阻光材料层通过镀膜方式固定于所述OLED柔性屏上。
在上述设计中，将阻光材料层通过镀膜方式固定于所述OLED柔性屏上，能够起到对柔性显示屏其他部件进行支撑作用，从而可以省去OLED柔性显示屏中的支撑层，简化OLED柔性屏的结构。
附图说明
图1为本申请实施例提供的屏下指纹检测终端示意图；
图2为本申请实施例提供的指纹检测模组框贴于显示屏幕下方的示意图；
图3为本申请实施例提供的指纹检测模组面贴于显示屏幕下方的示意图；
图4为本申请实施例提供的终端中显示屏、阻光材料层与指纹模组结构示意图之一；
图5为本申请实施例提供的终端中显示屏、阻光材料层与指纹模组结构示意图之二；
图6为本申请实施例提供的与图5所示结构对应的光线示意图；
图7为本申请实施例提供的终端中显示屏、阻光材料层与指纹模组结构示意图之三；
图8为本申请实施例提供的与图7所示结构对应的光线示意图；
图9为本申请实施例提供的θ与α示意图；
图10为本申请实施例提供的OLED柔性屏、阻光材料层与指纹模组结构示意图；
图11为本申请实施例提供的OLED硬屏、阻光材料层与指纹模组结构示意图。
具体实施方式
下面将结合附图对本申请实施例作进一步地详细描述。
由于指纹识别技术已相对成熟，具有安全性高、识别速度快、识别成功率高等优点，使得指纹识别技术已经被广泛应用于智能终端中。用户可以通过指纹识别代替密码输入，完成解锁显示屏、支付等操作。
在传统终端中，指纹检测器可以设置于终端的前面板上，也可以设置于终端的后面板上。用户可以根据自己的操作习惯，选择前置指纹识别的终端或后置指纹识别的终端。
随着终端技术的发展，为了更好的视觉体验，屏占比逐渐成为消费者和终端生产商所关心的问题。屏占比，即为屏幕与终端前面板的面积之比。较高的屏占比，能够为用户提供更好的视觉体验。因此，屏占比越高的终端，更能够获得消费者的青睐。
在提高终端的屏占比的设计中，为了满足偏好于使用前置指纹识别的用户的需求，设计者提出了将指纹检测器设置于显示屏面板的下方，即屏下指纹检测，用户可以通过将手指置于显示屏上从而实现指纹识别。
然而，当显示屏受到强烈的环境光照射时，若环境光透过显示屏照射到指纹模组，经指纹模组反射后的光线透过显示屏射出，则人眼可观察到指纹模组位置与其他位置的差异，降低了终端的美观度，给用户带来较差的体验。
为了解决上述问题，本申请实施例提供了一种基于屏下指纹检测的终端，该终端在受到强烈光照时，减少透过显示屏并经指纹模组的反射后的光线再经过显示屏射出，从而使得用户不易观察到指纹模组所在位置与显示屏其他位置的颜色差异，提高了终端的美观性，为用户带来较好的用户体验。
本发明实施例涉及的终端，可以包括手机、平板电脑、个人数字助理(personal digital assistant，PDA)等。
参见图4，为本申请实施例提供的终端中显示屏与指纹模组的结构示意图，如图所示，该终端包括显示屏41、阻光材料层42以及指纹模组43。其中，阻光材料层42设置于显示屏41和指纹模组43之间，显示屏41包括显示面和非显示面，而阻光材料层42设置于显示屏的非显示面。具体地，阻光材料层42用于阻止第一反射光线经显示屏41出射，其中，第一反射光线为入射到指纹模组43被反射出来的光线。
指纹模组，按照不同的采集指纹原理，可以包括基于光学的指纹模组、基于超声波的指纹模组、基于电容识别的指纹模组等。其中，基于光学的指纹模组又包含有利用可见光 采集指纹的指纹模组和利用红外光采集指纹的指纹模组。电容识别指纹传感器由于穿透能力限制无法做到屏下或者屏内，而目前终端中常见的屏下或屏内指纹识别器件主要为基于光学的指纹模组和基于超声波的指纹模组。
对于基于超声波的指纹模组，上述阻光材料层42可以是由对光线具有吸收特性的材料制成的。当终端受到环境光照射时，环境光经显示屏41出射后，大部分光线可被阻光材料层42吸收，从而阻挡大部分光线照射到指纹模组上并反射，进而减少了第一反射光线经显示屏41出射导致用户观察到指纹模组所在位置与显示屏上其他位置之间的颜色差异，从而提高了用户体验。
而对于基于光学的指纹模组，若采用上述设计，阻光材料层42将阻挡大部分光线照射到指纹模组上，则指纹模组可能无法采集到指纹。在一种可能的设计中，为了保证指纹模组的性能不受影响并同时降低用户对指纹模组的视觉感知，阻光材料层42可以包括线偏振片420和四分之一波片421。如图5所示，线偏振片420的一面朝向显示屏41的非显示面设置，另一面朝向四分之一波片421设置；四分之一波片421的一面朝向线偏振片420设置，另一面朝向指纹模组43设置。
其中，线偏振片420仅允许振动面为特定方向的光线透过线偏振片420，而振动方向为其他方向的光线则无法透过线偏振片420。
四分之一波片421具有以下特性：若以线偏振光入射到四分之一波片，且振动方向与四分之一波片光轴夹角为45°，则从四分之一波片出射的光为圆偏振光；反之，圆偏振光通过四分之一波片后变为线偏振光。
在设计线偏振片420和四分之一波片421时，可以尽可能将线偏振片420允许通过的光线振动方向与四分之一波片421光轴夹角设为45°，则经过线偏振片420后的线偏振光1(如图6所示)，再经过四分之一波片421后，则为圆偏振光2。圆偏振光照射到指纹模组表面，经反射后的光线依然为圆偏振光3。反射后的圆偏振光3再次经过四分之一波片421后，则变为线偏振光4。然而，该线偏振光4是经过两次四分之一波片421得到的，故而此时得到的线偏光4与线偏振光1相比，振动方向旋转了90°。例如，若图6中的线偏振光1的振动方向垂直于屏幕，线偏振片420仅允许振动方向为垂直于屏幕的光线通过。由于线偏振光4的振动方向为平行于屏幕，因此，线偏振光4无法再透过线偏振片420。因而由线偏振片420和四分之一波片421构成的阻光材料层42能够阻止经指纹模组的反射后的光线再经过显示屏射出，避免用户观察到指纹模组所在位置与显示屏其他位置的颜色差异，提高终端的美观性。
应当理解，阻光材料层42包括线偏振片420和四分之一波片421的设计，也可以应用于基于超声波的指纹模组中，或其他指纹模组中。
对于基于光学的指纹模组，为了使得指纹模组采集到清晰的指纹，需要考虑照射到指纹模组上的光线能量损失问题，即需要有足够经用户手指反射的光线照射到指纹模组上。在一种可能的设计中，上述阻光材料层42除了包括线偏振片420和四分之一波片421，还可以包括相位补偿片422，该相位补偿片422设置于线偏振片420与显示屏41之间，用于对经过显示屏41后入射到相位补偿片422的第一入射光线进行相位补偿，使得第一入射光线经过相位补偿片422后的第一出射光线为能够通过线偏振片420的线偏振光，从而保证有足够的光线能够通过线偏振片420进而照射到指纹模组43，使得指纹模组43能够采集到有效的指纹信息。
在一个具体实施例中，显示屏41、阻光材料层42和指纹模组43的结构可以如图7所示，从上到下依次为显示屏41、相位补偿片422、线偏振片420、四分之一波片421。
经过显示屏41后的光线81(即第一入射光线)通常为圆偏振光或者是椭圆偏振光，若圆偏振光或椭圆偏振光直接入射到线偏振片上，则仅有少量光线能够通过。而在该实施例中，在显示屏41和线偏振片420之间增加了相位补偿片422，如图8所示，相位补偿片422能够对光线81进行相位补偿，使得从相位补偿片422出射的光线82(即第一出射光线)为线偏振光，且光线82的振动方向为线偏振片420允许通过的振动方向。光线82经过线偏振片420后的光线83仍为线偏振光，且振动方向不变。光线83经过四分之一波片421后的光线84变为圆偏振光，圆偏振光经指纹模组表面反射的光线85(即第一反射光线)仍为圆偏振光。光线85经过四分之一波片421后的光线86变为线偏振光，但线偏振光86是经过两次四分之一波片421得到的，故而此时得到的线偏光86与线偏振光83相比，振动方向旋转了90°，而振动方向旋转了90°的线偏光86则无法再透过线偏振片420。
在上述实施例中，由于添加了相位补偿片422对经过显示屏41后的光线81进行相位补偿，使得经过相位补偿的后的光线能够顺利通过线偏振片420，保证了足够的照射到指纹模组上，不会影响指纹模组的性能；此外，被指纹模组表面反射的光线由于再次通过四分之一波片421，变为线偏振光，但振动方向旋转了90°因此无法再次通过线偏振片420。实现了阻止经指纹模组的反射后的光线再经过显示屏射出，避免用户观察到指纹模组所在位置与显示屏其他位置的颜色差异，提高终端的美观性。
具体地，光线81在入射到相位补偿片422后，出射光线82为线偏振光，该线偏振光线的振动方向x轴之间的夹角为θ(此处以x轴逆时针旋转相应角度与振动方向重合为例)，如图9所示；光线81与在x轴上的相位为
Figure PCTCN2018083106-appb-000005
在y轴上的相位为
Figure PCTCN2018083106-appb-000006
其中，x轴和y轴为预设的相互正交的坐标轴，x轴与y轴构成的平面平行于所示显示屏；为了方便计算，可将显示屏的宽度方向设为x轴，则显示屏的长度方向设为y轴(如图1所示)。
则经过相位补偿片422后的光线82可以由公式(1)表示。
Figure PCTCN2018083106-appb-000007
其中，
Figure PCTCN2018083106-appb-000008
表示x轴方向上的矢量，
Figure PCTCN2018083106-appb-000009
表示y轴方向上的矢量。
若相位补偿片422的快轴与x轴之间的夹角为α(此处以x轴逆时针旋转相应角度与振动方向重合为例)，如图9所示，相位补偿片在快轴方向上产生的相位为
Figure PCTCN2018083106-appb-000010
在慢轴方向上产生的相位为
Figure PCTCN2018083106-appb-000011
则公式(1)可转化为公式(2)。
Figure PCTCN2018083106-appb-000012
在公式(2)中，由于P′为线偏振光，因此P′在x轴和y轴上的相位差为π的整数倍，则根据公式(2)可推导出公式(3)。
Figure PCTCN2018083106-appb-000013
因此，相位补偿片422的参数若能够满足公式(3)，即可实现经过相位补偿片422出射的光线82为线偏振光。
例如，若
Figure PCTCN2018083106-appb-000014
其中，m为整数，则根据公式(3)可推导出α＝0。
又例如，若
Figure PCTCN2018083106-appb-000015
其中，m为整数，则根据公式(3)可推导出：
Figure PCTCN2018083106-appb-000016
此时，相位补偿片422可以由四分之一波片实现。
再例如，若
Figure PCTCN2018083106-appb-000017
其中，m为整数，则根据公式(3)可推导出
Figure PCTCN2018083106-appb-000018
应当理解，上述举例仅为满足公式(3)的一些特例，参数满足公式(3)的波片即可作为本申请实施例中的相位补偿片422。
在一个具体实施例中，若显示屏为有机发光二极管(organic light emitting diode，OLED)柔性屏，则显示屏、阻光材料层以及指纹模组可以如图10所示。显示屏101可以包括玻璃盖板(cover glass，CG)1011、光学清洁粘合剂(optically clear adhesive，OCA)1012、线偏振片1013、四分之一波片1014、触控板1015、发光层1016、支撑层(或背板)1017。其中，玻璃盖板1011用于对显示屏进行保护，不影响光路、光线的偏振类型、相位等。线偏振片1013允许光的振动面为固定方向的光线透过。四分之一波片1014，可使入射的线偏振光变为圆偏振光。触控板1015用于对检测用户的触摸操作，不影响光路、光线的偏振类型、相位等。发光层1016用于发光，但对于外界的环境光，发光层不影响光路、光线的偏振类型、相位等。支撑层1017用于对显示屏进行支撑。
如图10所示，由相位补偿片1021、线偏振片1022和四分之一波片1023构成的阻光材料层102，通过粘合层1贴合在显示屏101的非显示面上，通过粘合层2与指纹模组103贴合。其中，粘合剂可以采用温室硫化硅橡胶(room temperature vulcanized silicone rubber，RTV)，或者可以采用光学清洁粘合剂(optically clear adhesive，OCA)。
此外，还可以通过镀膜的方式实现显示屏101和阻光材料层102的位置固定，则可以省去图10中的粘合层1；还可以通过镀膜的方式实现显示屏101和阻光材料层102的位置固定，则可以省去图10中的粘合层2。
进一步地，相位补偿片1021和线偏振片1022之间也可以通过粘合剂贴合或通过镀膜的方式实现位置固定；线偏振片1022和四分之一波片1023之间也可以通过粘合剂贴合或通过镀膜的方式实现位置固定。
可选地，若显示屏101和阻光材料层102通过镀膜方式固定在一起，则阻光材料层102可以起到对显示片101进行支撑的作用，因此，可以省去显示屏101中的支撑层1017，以降低显示屏101的厚度。
在另一个具体实施例中，若显示屏为OLED硬屏，则显示屏、阻光材料层以及指纹模组可以如图11所示。显示屏111可以包括玻璃盖板1111、粘合层1112、线偏振片1113、四分之一波片1114、密封玻璃(encap glass)1115、低温多晶硅(low temperature poly-silicon，LTPS)1116。其中，玻璃盖板1111、粘合层1112、密封玻璃1115、低温多晶硅1116不影响光线的偏振类型、相位等。
如图11所示，由相位补偿片1121、线偏振片1122和四分之一波片1123构成的阻光材料层112，通过粘合层1贴合在显示屏111的非显示面上，通过粘合层2与指纹模组113贴合。其中，粘合剂可以采用RTV，或者可以采用OCA。
如前所述，还通过镀膜的方式实现显示屏111和阻光材料层112的位置固定，则可以省去图11中的粘合层1；此外，还可以通过镀膜的方式实现显示屏111和阻光材料层112的位置固定，则可以省去图11中的粘合层2。
在另外一种可能的设计中，还可以将阻光材料层112设置于密封玻璃1115和低温多晶 硅1116之间。由于密封玻璃1115和低温多晶硅1116对光线传输没有影响，因此，将将阻光材料层112置于密封玻璃1115和低温多晶硅1116之间，仍然能够起到阻挡经指纹模组反射后的光线，避免用户观察到指纹模组所在位置与显示屏其他位置之间颜色差异。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、光学存储器等)上实施的计算机程序产品的形式。
显然，本领域的技术人员在本申请的技术方案的基础上，对本申请进行的等同替换、改进等，均应包括在本申请的保护范围之内。

Claims (11)

  1. 一种终端，其特征在于，所述包括：显示屏、阻光材料层、指纹模组；
    所述显示屏包括显示面和非显示面；
    所述阻光材料层的一面朝向所述显示屏的非显示面设置，所述阻光材料层的另一面朝向所述指纹模组设置；
    所述阻光材料层用于阻止第一反射光线经过所述显示屏出射，所述第一反射光线为当光线入射到指纹模组的表面上时，被所述指纹模组的表面反射出来的光线。
  2. 如权利要求1所述的终端，其特征在于，所述阻光材料层包括：线偏振片和四分之一波片；
    所述线偏振片的一面朝向所述显示屏的非显示面设置，所述线偏振片的另一面朝向所述四分之一波片设置；
    所述四分之一波片的一面朝向所述线偏振片设置，所述四分之一波片的另一面朝向所述指纹模组设置。
  3. 如权利要求2所述的终端，其特征在于，所述线偏振片允许透过的光线的偏振方向，与所述四分之一波片的光轴夹角为45°。
  4. 如权利要求2或3所述的终端，其特征在于，所述阻光材料层还包括：相位补偿片，用于对第一入射光线进行相位补偿，使得入射光线经过所述相位补偿片补偿后的出射光线为线偏振光线，所述第一入射光线为通过所述显示屏的显示面入射的光线；
    所述相位补偿片置于所述线偏振片和所述显示屏之间。
  5. 如权利要求4所述的终端，其特征在于，所述相位补偿片的快轴与x轴之间的夹角，第一入射光线在x轴、y轴上的相位差，以及相位补偿片在快轴、慢轴上的相位差满足下述公式：
    Figure PCTCN2018083106-appb-100001
    其中，所述第一入射光线为经过显示屏入射到所述相位补偿片的光线；
    α表示所述相位补偿片的快轴与x轴之间的夹角，θ表示所述第一出射光线的振动方向与x轴之间的夹角，
    Figure PCTCN2018083106-appb-100002
    表示所述第一入射光线分别在x轴、y轴上的相位，
    Figure PCTCN2018083106-appb-100003
    表示所述相位补偿片分别在快轴、慢轴上的相位，x轴和y轴为预设的相互正交的坐标轴，所述x轴与所述y轴构成的平面平行于所示显示屏。
  6. 如权利要求4所述的终端，其特征在于，所述相位补偿片的快轴与x轴之间的夹角α＝0；
    第一入射光线在x轴、y轴上的相位差，以及相位补偿片在快轴、慢轴上的相位差满足下述公式：
    Figure PCTCN2018083106-appb-100004
    其中，所述第一入射光线为经过显示屏入射到所述相位补偿片的光线；
    Figure PCTCN2018083106-appb-100005
    表示所述第一入射光线分别在x轴、y轴上的相位，
    Figure PCTCN2018083106-appb-100006
    表示所述相位补偿 片分别在快轴、慢轴上的相位，x轴和y轴为预设的相互正交的坐标轴，x轴与y轴构成的平面平行于所示显示屏，m为整数。
  7. 如权利要求4所述的终端，其特征在于，所述相位补偿片为四分之一波片。
  8. 如权利要求1所述的终端，其特征在于，所述指纹模组为基于超声波的指纹模组；
    所述阻光材料层的材料为对光线具有吸收特性的材料。
  9. 如权利要求1至8中任一项所述的终端，其特征在于，所述阻光材料层通过贴合或镀膜置于所述显示屏和所述指纹模组之间。
  10. 如权利要求1至9中任一项所述的终端，其特征在于，所述显示屏为有机发光二极管OLED硬屏。
  11. 如权利要求1至8中任一项所述的终端，其特征在于，所述显示屏为OLED柔性屏；
    所述OLED柔性屏中的支撑层由所述阻光材料层替换；
    所述阻光材料层通过镀膜方式固定于所述OLED柔性屏上。
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