WO2020056544A1 - 屏下光学检测系统、电子设备及其物体接近检测方法 - Google Patents

屏下光学检测系统、电子设备及其物体接近检测方法 Download PDF

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Publication number
WO2020056544A1
WO2020056544A1 PCT/CN2018/105929 CN2018105929W WO2020056544A1 WO 2020056544 A1 WO2020056544 A1 WO 2020056544A1 CN 2018105929 W CN2018105929 W CN 2018105929W WO 2020056544 A1 WO2020056544 A1 WO 2020056544A1
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WIPO (PCT)
Prior art keywords
light
screen
module
under
detection system
Prior art date
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Ceased
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PCT/CN2018/105929
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English (en)
French (fr)
Inventor
梁伟忠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Publication date
Application filed by Shenzhen Goodix Technology Co Ltd filed Critical Shenzhen Goodix Technology Co Ltd
Priority to CN201880001917.XA priority Critical patent/CN109328358A/zh
Priority to PCT/CN2018/105929 priority patent/WO2020056544A1/zh
Priority to CN201880002592.7A priority patent/CN109691069A/zh
Priority to PCT/CN2018/120605 priority patent/WO2020056939A1/zh
Publication of WO2020056544A1 publication Critical patent/WO2020056544A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • 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
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31—User authentication
    • G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints

Definitions

  • the present disclosure relates to the field of semiconductor display technology, and in particular, to an under-screen optical detection system, an electronic device, and an object proximity detection method.
  • the screen fingerprint recognition scheme can provide a higher screen ratio , While bringing users a more comfortable experience.
  • the LCD screen needs a backlight module to provide a light source, that is, the LCD screen usually includes a liquid crystal module and a backlight module.
  • the backlight module usually includes a point light source and multiple layers of laminated materials with different functions.
  • the laminated materials include a reflective film (also called a mirror film), a light guide plate, a uniform light film (also called a diffusion film), and a prism film (also called brightness enhancement). Film), where there is at least one layer for both the uniform light film and the prism film.
  • the purpose of superimposing and combining these materials is to make one or more point light sources form a surface light source, and at the same time improve the light output rate, so that the LCD screen display screen can look uniform brightness.
  • the reflective film of the backlight module reflects light, and other laminated materials, such as light guide plates, light uniform films, and prism films, will be left.
  • the scattered light, especially the uniform light film will play a role of fogging, so the entire backlight module is equivalent to being opaque.
  • the optical sensor cannot be used to detect the LCD below the LCD screen display area. Fingerprint information of the finger at the top of the screen or characteristic information of other objects.
  • an object of the present disclosure is to provide an under-screen optical detection system that can be applied to an LCD screen; another object of the present disclosure is to provide an electronic device using the under-screen optical detection system; Another object of the disclosure is to provide an object proximity detection method using the electronic device.
  • An embodiment of the present disclosure provides an under-screen optical detection system, where the under-screen optical detection system includes a display screen, an optical sensor, and a light source;
  • the display screen includes a display module and a backlight module, the backlight module is disposed below the display module, the backlight module includes an OLED module, and a light emitting surface of the OLED module faces the display module A group for providing visible light to the display module so that the display module displays a picture;
  • the optical sensor is disposed below the OLED module
  • the light source is configured to emit excitation light to a target object above the display screen, and the excitation light reflects on the surface of the target object and forms reflected light or enters the interior of the target object and exits from the bottom to form transmitted light, where The reflected light and the transmitted light return to the display screen and pass through the OLED module, and are received by an optical sensor below it for optical detection under the screen.
  • the backlight module further includes a reflective film, and the reflective film is adhered to the bottom surface of the OLED module, and the bottom surface is in contact with the bottom surface of the OLED module.
  • the light emitting surface of the OLED module faces away from each other.
  • the reflective film is configured to reflect visible light emitted by the OLED module to the display module, and reflect the reflected light and the The transmitted light is transmitted to an optical sensor below the OLED module.
  • the excitation light emitted by the light source is non-visible light having a specific wavelength, and the wavelength of the invisible light is located in the transmission wavelength range of the reflective film. within.
  • the light source is an infrared light source
  • the reflective film has transparency to infrared light and reflection ability to visible light
  • the display screen is an LCD screen
  • the display module is a liquid crystal module
  • the light source is disposed below the backlight module and is disposed adjacent to the optical sensor.
  • the under-screen optical detection system further includes a transparent cover plate disposed above the display screen, and the transparent cover plate includes a cover covering the display.
  • the transparent cover plate includes a cover covering the display.
  • a main body portion of the screen and an extension portion extending from an edge of the main body portion, and the light source is disposed below the extension portion.
  • the under-screen optical detection system further includes a coating, the coating is disposed between the transparent cover plate and the light source, and is used for The excitation light emitted by the light source is transmitted, and the visible light emitted by the OLED module is isolated.
  • the wavelength of the excitation light emitted by the light source is different from the wavelength of the visible light provided by the backlight module, and the wavelength of the excitation light is different from the wavelength of the excitation light.
  • the working wavelength of the optical sensor corresponds.
  • the optical sensor is an optical fingerprint sensor, and when the target object is a user's finger, the optical fingerprint sensor is configured to receive light passing through the OLED.
  • the module reflects light and transmits light, and acquires a fingerprint image of the finger according to the reflected light and the transmitted light.
  • Another embodiment of the present disclosure provides an electronic device including the under-screen optical detection system as described above.
  • the electronic device further includes a housing, and the under-screen optical detection system is at least partially disposed inside the housing.
  • Another embodiment of the present disclosure provides an object proximity detection method, which is applied to an electronic device as described above.
  • the object proximity detection method includes:
  • the environmental brightness value of detecting non-visible light of a specific wavelength in the current environment includes:
  • the optical sensor When the light source is in an off state, the optical sensor is used to perform brightness detection, and an ambient brightness value of the invisible light with the specific wavelength is obtained.
  • the actual brightness value of detecting non-visible light of the specific wavelength when the light source is turned on includes:
  • the non-visible light emitted by the light source is reflected on the surface of the target object above the display screen and forms reflected light or enters the target object and exits from the bottom to form transmitted light, and the reflected light and the transmitted light return to the screen
  • the display screen of the optical detection system passes through the OLED module;
  • the optical sensor receives the reflected light and the transmitted light passing through the OLED module, and detects an actual brightness value of the non-visible light of the specific wavelength currently based on the reflected light and the transmitted light.
  • judging the proximity of the current target object to the electronic device according to the actual brightness value and the ambient brightness value includes:
  • the method further includes:
  • a first event is executed by using a processor of the electronic device.
  • the predetermined working state is a call state
  • the first event includes controlling a display screen of the electronic device to be in an on-screen state.
  • the method further includes:
  • a second event is executed using a processor of the electronic device, and the second event includes controlling a display screen of the electronic device to maintain a bright screen state .
  • the under-screen optical detection system includes a display screen, an optical sensor, and a light source;
  • the display screen includes a display module and a backlight module,
  • the backlight module is disposed below the display module, the backlight module includes an OLED module, and a light emitting surface of the OLED module faces the display module, and is configured to provide visible light to the display module to Causing the display module to display a picture;
  • the optical sensor is disposed below the OLED module;
  • the light source is configured to emit excitation light to a target object above the display screen, and the excitation light is on a surface of the target object Reflection occurs and forms reflected light or enters the inside of the target object and exits from the bottom to form transmitted light, wherein the reflected light and the transmitted light return to the display screen and pass through the OLED module,
  • the optical sensor receives it for optical detection under the screen.
  • the embodiment of the present disclosure realizes the function of detecting a light signal below the display area
  • FIG. 1 is a schematic structural diagram of an under-screen optical detection system according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of an under-screen optical detection system according to another embodiment of the present disclosure.
  • FIG. 3 is a schematic structural diagram of an embodiment of a backlight module suitable for an under-screen optical detection system provided by the present disclosure
  • FIG. 4 is a schematic structural diagram of a first specific implementation manner of the backlight module shown in FIG. 3;
  • FIG. 5 is a schematic structural diagram of a second specific implementation manner of the backlight module shown in FIG. 3;
  • FIG. 6 is a schematic diagram of an optical detection principle of the optical detection system under the screen shown in FIG. 1;
  • FIG. 7 is a flowchart of an object proximity detection method according to an embodiment of the present disclosure.
  • FIG. 1 is a schematic structural diagram of an under-screen optical detection system according to an embodiment of the present disclosure.
  • the under-screen optical detection system includes a transparent cover 10, a liquid crystal module 20, a backlight module 30, an optical sensor 40 and a light source 50.
  • the liquid crystal module 20 is disposed under the transparent cover plate 10; the backlight module 30 is disposed under the liquid crystal module 20.
  • the liquid crystal module 20 and the backlight module 30 are superposed on each other to form an LCD screen 90.
  • the optical sensor 40 is disposed below the backlight module 30, for example, it is specifically disposed at a preset position below the backlight module 30, and its optical detection area is at least partially below the display area of the LCD screen 90.
  • the light source 50 is disposed below the backlight module 30 and is adjacent to the optical sensor 40.
  • the transparent cover 10 is made of transparent material and has strong anti-stress capability, and can protect the LCD screen 90.
  • the transparent cover 10 may be a glass cover or a sapphire cover.
  • the liquid crystal module 20 belongs to a display component, but cannot emit light by itself, and the backlight module 30 is required to provide a light source.
  • the backlight module 30 can emit visible light to provide a uniform visible light surface light source for the liquid crystal module 20 so that the LCD screen 90 can display a picture.
  • the backlight module 30 can be optically designed so that it is a liquid crystal module. 20 While providing a visible light source, it has a high transmittance for non-visible light in a specific band.
  • the optical sensor 40 may be, for example, a CMOS image sensor, a CCD image sensor, or other types of optical sensors.
  • the optical sensor 40 is disposed below the backlight module 30 and is configured to detect characteristic information of a target object above the LCD screen 90 by means of optical detection under the screen.
  • the target object is a finger or other human body part near or pressing on the LCD screen 90 (or the transparent cover 10 on the surface)
  • the optical sensor 40 may be used to detect fingerprint information or other biometric information of the finger (Such as heart rate, blood oxygen concentration, etc.), and other optical information (such as the distance between the other human body parts and the LCD screen 90 or relative position information) can also be detected.
  • the light source 50 may be a light source with a different emission wavelength from the backlight module 30, and may provide excitation light for optical detection under the screen of the optical sensor 40.
  • the wavelength of the excitation light specifically corresponds to the working wavelength of the optical sensor 40. For example, the above The wavelength of the excitation light and the operating wavelength of the optical sensor 40
  • the light source 50 may be an infrared light source, such as an infrared light emitting diode (LED), which may provide infrared light as the excitation light of the optical sensor 40.
  • LED infrared light emitting diode
  • FIG. 2 is a schematic structural diagram of an under-screen optical detection system according to another embodiment of the present disclosure.
  • the light source 50 and the LCD screen 90 are arranged side by side under the transparent cover 10.
  • the transparent cover 10 also has an extension portion compared to the LCD screen 90.
  • the extension portion may be located under the screen.
  • the light source 50 and the LCD screen 90 are respectively arranged side by side under the main body portion and the extension portion of the transparent cover plate 10.
  • there is a certain gap between the light source 50 and the LCD screen 90 may also be filled with a light-shielding material or provided with other components.
  • a coating 60 may be further provided between the transparent cover plate 10 and the light source 50.
  • the coating layer 60 can be applied in advance to the area of the lower surface of the transparent cover plate 10 where the light source 50 is disposed, which can transmit non-visible light, such as non-visible light of a specific wavelength band emitted by the light source 50, and can also isolate visible light. That is, the coating 60 cannot transmit visible light to prevent the user from seeing the light source 50 below through the transparent cover 10.
  • the backlight module of an LCD screen usually uses a laminated structure formed by a reflective film, a light guide plate, a uniform light film, and a prism film to provide a surface light source, which cannot transmit the excitation light emitted by the light source below the backlight module. And the detection light reflected by the excitation light on the surface of the target object above the LCD screen cannot support the optical information of the target object through the optical detection under the screen by the optical sensor below the LCD screen.
  • This embodiment provides a new design scheme of a backlight module, which is applicable to the optical detection under the screen of an LCD screen.
  • FIG. 3 is a schematic structural diagram of an embodiment of a backlight module provided by the present disclosure and applicable to the under-screen optical detection system shown in FIG. 1 or FIG. 2.
  • the backlight module includes a reflective film 310 and an OLED module 320.
  • the OLED module 320 and the reflective film 310 are bonded to each other.
  • the reflective film 310 can be bonded to the bottom surface of the OLED module 320 (that is, The light-emitting surface of the OLED module faces away from the surface), and the light-emitting surface of the OLED module 320 can face the liquid crystal module 20 shown in FIG. 1 or FIG. surface.
  • the reflective film 310 can reflect visible light, and can also transmit non-visible light in a specific wavelength band.
  • the OLED module 320 is used to provide a uniform visible light surface light source for the above-mentioned liquid crystal module 20 through its light emitting surface, and the visible light emitted by the OLED module 320 away from the light emitting surface can be reflected back to the OLED module 320 by the reflective film 310, and Transmitted from the light-emitting surface of the OLED module 320, thereby improving the overall light-emitting efficiency of the backlight module 30 on the one hand, and preventing visible light emitted by the OLED module 320 from entering the optical sensor 40 on the bottom surface thereof to cause interference with the optical detection under the screen .
  • the excitation light emitted by the light source 50 is a non-visible light with a specific wavelength (the wavelength of the light source 50 is located in the reflection of the reflective film 310) Within the wavelength range), the excitation light can pass through the reflective film 310, the OLED module 320, the liquid crystal module 20, and the transparent cover 10 in this order, and irradiate the finger or other target objects.
  • part of the light is directly reflected by the surface of a finger or other target object and forms reflected light, and another part of the light enters the finger or other object and is transmitted out of the bottom of the finger or other object to form transmitted light.
  • the optical sensor 40 can Detection of optical information, that is, the technical solution of this embodiment implements the function of optical detection under the screen.
  • FIG. 4 is a schematic structural diagram of a first specific implementation manner of the backlight module shown in FIG. 3.
  • the backlight module includes: a reflective film 310 and an OLED module 320.
  • the OLED module 320 further specifically includes a package. 3201, cathode 3202, organic functional layer 3203, anode 3204, and substrate 3205.
  • the reflective film 310 can reflect visible light, and can also transmit non-visible light in a specific wavelength band.
  • the OLED module 320 and the reflective film 310 are bonded to each other.
  • One side of the package 3201 is a reflective film 310 and the other side is a cathode 3202.
  • One side of the cathode 3202 is a package 3201 and the other side is an organic functional layer 3203.
  • One side is the cathode 3202, and the other side is the anode 3204.
  • One side of the anode 3204 is the organic functional layer 3203, and the other side is the substrate 3205.
  • One side of the substrate 3205 is the anode 3204, and the other side is the light emitting surface of the backlight module 30.
  • the module 20 is arranged, that is, the light emitting direction of the backlight module 30 is the direction in which the organic functional layer 3203 is directed to the substrate 3205.
  • the package 3201 can be made of glass, film, or other materials, and can transmit light to isolate oxygen, water vapor, and dust to improve the service life of the OLED module 320.
  • the substrate 3205 can be a material such as glass or polymer, and can transmit light to support the OLED module 320.
  • the cathode 3202 and the anode 3204 may be transparent electrodes.
  • the transparent electrodes may be transparent metal electrodes or semi-transparent metal electrodes.
  • the organic functional layer 3203 may be an organic molecule or an organic polymer, and may transmit light. Therefore, the OLED module 320 as a whole can transmit light.
  • the light-emitting mechanism of the OLED module 320 is: after a driving voltage is applied to the cathode 3202 and the anode 3204 through a driving circuit, the electrons of the cathode 3202 will flow through the organic functional layer 3203 to the anode 3204, and the holes of the anode 3204 flow through the organic functional layer 3203.
  • the cathode 3202 when the electrons and the holes meet in the organic functional layer 3203, are combined under the action of Coulomb force to generate excitons.
  • the exciton transfers energy to the organic light-emitting molecules in the organic functional layer 3203 under the action of an electric field. After absorbing the energy, the organic light-emitting molecules will transition from the ground state to the excited state.
  • the organic light-emitting molecules in an excited state are unstable, they need to return to a stable ground state through spontaneous radiation. In this process, energy is released in the form of photons, so the OLED module 320 can emit visible light as a liquid crystal mode. Backlight for group 20.
  • FIG. 5 is a schematic structural diagram of a second specific implementation manner of the backlight module shown in FIG. 3.
  • the difference from FIG. 4 is that the bonding surfaces of the OLED module 320 and the reflective film 310 are different.
  • one side of the package 3201 in FIG. 4 is a reflective film 310 and the other side is a cathode 3202;
  • one side of the substrate 3205 is an anode 3204, and the other side is a light emitting surface of the backlight module 30 and is disposed toward the liquid crystal module 20.
  • FIG. 4 one side of the package 3201 in FIG. 4 is a reflective film 310 and the other side is a cathode 3202;
  • one side of the substrate 3205 is an anode 3204, and the other side is a light emitting surface of the backlight module 30 and is disposed toward the liquid crystal module 20.
  • one side of the package 3201 is the light emitting surface of the backlight module 30 and is disposed toward the liquid crystal module 20 (that is, the light emitting direction of the backlight module 30 is the direction in which the organic functional layer 3203 is directed to the package 3201), and the other side is the cathode 3202. ;
  • One side of the substrate 3205 is an anode 3204, and the other side is a reflective film 310.
  • FIG. 6 is a schematic diagram of the optical detection principle of the under-screen optical detection system shown in FIG. 1.
  • the above-mentioned under-screen optical detection system can be used to detect fingerprint information of the finger 80 pressed on its surface.
  • the light source 50 emits excitation light 70
  • the excitation light 70 is the invisible light of the specific wavelength described above, which is consistent with the operating wavelength of the optical sensor 40.
  • the excitation light 70 passes through the backlight module 30, the liquid crystal module 20, and the transparent cover 10 in order to reach the finger 80.
  • part of the excitation light 70 is reflected by the surface of the finger 80 to form reflected light 71; the other part enters the interior of the finger 80, and passes through a series of paths to pass through the bottom of the finger 80 to form transmitted light 72.
  • the reflected light 71 and transmitted light 72 pass through the transparent cover 10, the liquid crystal module 20, and the backlight module 30 in order and reach the optical sensor 40 (here, the working wavelength of the optical sensor 40 is the same as the wavelength of the reflected light 71 and transmitted light 72, and
  • the optical sensor 40 may be an optical fingerprint sensor).
  • After the optical sensor 40 detects the optical signal it is transmitted to a processor (not shown) for processing.
  • the processor recovers the fingerprint image of the finger 80 according to the obtained optical signal, and then performs optical detection with the screen.
  • the authenticated fingerprint images in the system database are compared for identification.
  • the under-screen optical fingerprint detection shown in FIG. 6 is only a specific application of the above-mentioned under-screen optical detection system; in other embodiments, the above-mentioned under-screen optical detection system may also be used for optical detection of other target objects.
  • the above-mentioned under-screen optical detection system when applied to an electronic device such as a smart phone or a tablet computer, it can perform object proximity detection.
  • the present disclosure also provides an object proximity detection method.
  • FIG. 7 is a flowchart of an object proximity detection method according to an embodiment of the present disclosure. As shown in FIG. 7, the method includes:
  • Step S101 Obtain the current working state of the electronic device.
  • step S102 it is determined whether the current working state is a predetermined working state. If so, step S103 is performed, otherwise step S108 is performed.
  • the above-mentioned predetermined working state may be defined according to actual conditions.
  • the predetermined working state may be a call state.
  • the electronic device may enable optical detection under the screen.
  • the system performs object proximity detection to detect the distance between the user's head and the electronic device, and performs corresponding control.
  • Step S108 is to perform other operations, such as responding to user control and performing corresponding operations.
  • Step S103 Detect the ambient brightness value of non-visible light of a specific wavelength in the current environment, and record the ambient brightness value as L1, where the wavelength of the invisible light is related to the light emission wavelength of the light source 50 of the optical detection system under the screen correspond.
  • the above-mentioned invisible light with a specific wavelength may specifically be an invisible light corresponding to a working wavelength of the optical sensor 40 of the optical detection system under the screen, such as infrared light.
  • step S103 before detecting the ambient brightness value L1, it is necessary to determine whether the light source 50 of the under-screen optical detection system is turned off. If the current light source 50 is on, the under-screen optical detection system needs to turn off the light source. 50. Prepare for detecting the current ambient brightness value L1. When the light source 50 is in the off state, the optical sensor 40 is used for brightness detection, and an ambient brightness value L1 is obtained.
  • Step S104 Detect the actual brightness value of the non-visible light of the specific wavelength when the light source 50 is turned on, and record the actual brightness value as L2;
  • the light source 50 When the light source 50 is turned on, non-visible light of the above specific wavelength is emitted as excitation light.
  • the excitation light passes through the backlight module 30, the liquid crystal module 20, and the transparent cover plate 10, and then exits from the surface of the transparent cover plate 10.
  • the excitation light emitted by the light source 50 will reflect on the surface of the object 80 and form reflected light or enter the target object 80 and exit from the bottom to form transmitted light, the reflected light and the transmitted light
  • the wavelength corresponds to the excitation light, that is, the reflected light and the transmitted light are also invisible light of the specific wavelength described above.
  • the reflected light and transmitted light returned from the object 80 pass through the transparent cover 10, the liquid crystal module 20, and the backlight module 30 in sequence and enter the optical sensor 40.
  • the optical sensor 40 can detect that the light source 50 is turned on.
  • the above-mentioned actual brightness value L2 gradually increases.
  • the distance between the object 80 and the electronic device reaches a certain distance, the actual brightness value L2 when the light source 50 is turned on is greater than the above-mentioned ambient brightness. Value L1; and the closer the object 80 is to the electronic device, the larger the actual brightness value L2 is than the ambient brightness value L1. Therefore, the proximity of the current object 80 to the electronic device can be determined based on the actual brightness value L2 and the ambient brightness value L1.
  • step S105 it is determined whether a difference (L2-L1) between the actual brightness value L2 and the ambient brightness value L1 is greater than a set threshold; if yes, step S106 is performed, otherwise step S107 is performed.
  • this threshold is determined by the actual debugging distance.
  • the difference between the actual brightness value L2 and the ambient brightness value L1 (L2-L1) is greater than the threshold, it can be determined that the distance between the object 80 and the electronic device has been Less than the predetermined value. For example, when the mobile phone is in a call state, if the distance between the mobile phone and the head is less than a certain distance, the LCD screen may be triggered by the processor of the electronic device to display an interest screen to achieve power saving. If the above-mentioned difference (L2-L1) is smaller than the threshold, it means that the object 80 does not block the mobile phone, so the processor can maintain a bright screen or perform other operations.
  • step S106 the processor executes a first event; the first event may be controlling the LCD screen 90 to be in an inactive state or other operations.
  • step S107 the processor executes a second event.
  • the second event may be controlling the LCD screen 90 to maintain a bright screen state, or controlling other functional components to perform other operations.

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Abstract

一种屏下光学检测系统、电子设备及其物体（80）接近检测方法。该屏下光学检测系统包括：显示屏幕，其包括显示模组和背光模组（30），背光模组（30）包括OLED模组，OLED模组的出光面朝向显示模组，用于向显示模组提供可见光以使显示模组显示画面；光学传感器（40），其设置在OLED模组下方；光源（50），用于向显示屏幕上方的目标物体（80）发出激励光（70），激励光（70）在所述目标物体（80）表面发生反射并形成反射光（71）或者进入目标物体（80）内部并从底部出射形成透射光（72），其中反射光（71）和透射光（72）返回显示屏幕并穿过OLED模组，并且被其下方的光学传感器（40）接收以进行屏下光学检测。实现了LCD屏幕（90）显示区域下方检测光信号的功能，同时还实现了判断物体（80）接近的功能。

Description

屏下光学检测系统、电子设备及其物体接近检测方法 技术领域
本公开涉及半导体显示技术领域，特别涉及一种屏下光学检测系统、电子设备及其物体接近检测方法。
背景技术
随着科学技术的进步，智能手机、平板电脑以及其他电子设备采用的指纹识别技术逐渐从传统的物理电容式指纹识别方案向屏幕指纹识别方案发展，屏幕指纹识别方案可以提供更高的屏占比，同时给用户带来更加舒适的体验。
当前屏幕下方实现检测指纹信息的技术只适用在OLED屏幕，而无法应用到LCD屏幕。具体来说，由于液晶只能改变输入光的方向而不会发光，因此LCD屏幕需要背光模组来提供光源，即LCD屏幕通常包含液晶模组和背光模组。背光模组通常包括点光源和多层不同功能的叠层材料，叠层材料包括反射膜(又称镜面膜)、导光板、匀光膜(又称扩散膜)和棱镜膜(又称增亮膜)，其中匀光膜和棱镜膜都至少会有一层。这些材料叠加组合的目的是使一个或者多个点光源形成面光源，同时提高出光率，使得LCD屏幕显示画面能够看上去亮度均匀。
然而，如果要将光学传感器设置在LCD屏幕下方来实现屏下光学检测，由于背光模组的反射膜会反射光线，而剩下其他的叠层材料，例如导光板、匀光膜和棱镜膜会打散光线，尤其是匀光膜，会起到雾化的作用，因此整个背光模组相当于是不透光的。当手指或其他物体位于LCD屏幕上方时，从手指或其他物体表面反射的光线无法穿过背光模组并在LCD屏幕下方的光学传感器上成像，因此无法使用光学传感器在LCD屏幕显示区域下方检测LCD屏幕上方的手指的指纹信息或者其他物体的特征信息。
发明内容
针对背景技术中的问题，本公开的目的在于提供一种可以适用于LCD屏幕的屏下光学检测系统；本公开的另一个目的在于提供一种采用所述屏下光学检测系统的电子设备；本公开的另一个目的在于提供一种采用所述电子设备的物体接近检测方法。
本公开的一个实施例提供了一种屏下光学检测系统，所述屏下光学检测系统包括显示屏幕、光学传感器以及光源；
所述显示屏幕包括显示模组和背光模组，所述背光模组设置在所述显示模组下方，所述背光模组包括OLED模组，所述OLED模组的出光面朝向所述显示模组，用于向所述显示模组提供可见光以使所述显示模组显示画面；
所述光学传感器设置在所述OLED模组下方；
所述光源用于向所述显示屏幕上方的目标物体发出激励光，所述激励光在所述目标物体表面发生反射并形成反射光或者进入所述目标物体内部并从底部出射形成透射光，其中所述反射光和所述透射光返回所述显示屏幕并穿过所述OLED模组，并且被其下方的光学传感器接收以进行屏下光学检测。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述背光模组还包括反射膜，所述反射膜贴合在所述OLED模组的底面，所述底面为与所述OLED模组的出光面相背离的表面。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述反射膜用于将所述OLED模组发出的可见光反射至所述显示模组，并且将所述反射光和所述透射光透射到所述OLED模组下方的光学传感器。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述光源发出的激励光为具有特定波长的非可见光，其中所述非可见光的波长位于所述反射膜的穿透波长范围之内。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述光源为红外光源，且所述反射膜对红外光具有穿透性而对可见光具有反射能力。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述显示屏幕为LCD屏幕，且所述显示模组为液晶模组。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述光源设置在所述背光模组下方，并邻近于所述光学传感器设置。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述屏下光学检测系统还包括设置在所述显示屏幕上方的透明盖板，所述透明盖板包括覆盖在所述显示屏幕的主体部以及从所述主体部边缘延伸出的延伸部，所述光源设置在所述延伸部的下方。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述屏下光学检测系统还包括涂层，所述涂层设置在所述透明盖板与所述光源之间，用于透射所述光源发出的激励光，并隔离所述OLED模组发出的可见光。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述光源发出的激励光的波长与所述背光模组提供的可见光的波长不同，且所述激励光的波长与所述光学传感器的工作波长相对应。
作为本公开提供的屏下光学检测系统的一种可选实现方案，所述光学传感器为光学指纹传感器，在所述目标物体为用户手指时，所述光学指纹传感器用于接收穿过所述OLED模组的反射光和透射光，并根据所述反射光和所述透射光获取所述手指的指纹图像。
本公开的另一个实施例提供了一种电子设备，所述电子设备包括如上所述的屏下光学检测系统。
作为本公开提供的电子设备的一种可选实现方案，所述电子设备还包括外壳，所述屏下光学检测系统至少部分设置在所述外壳内部。
本公开的另一个实施例提供了一种物体接近检测方法，应用在如上所述的电子设备，所述物体接近检测方法包括：
获取当前电子设备所处工作状态；
判断当前所述工作状态是否为预定工作状态，如果是，检测当前环境下特定波长的非可见光的环境亮度值，其中所述非可见光的波长与所述屏下光学检测系统的光源的发光波长相对应，否则执行其他操作；
检测在所述光源开启状态下所述特定波长的非可见光的实际亮度值；
根据所述实际亮度值与所述环境亮度值，判断当前目标物体与所述电子设备的接近情况。
作为本公开提供的物体接近检测方法的一种可选实现方案，所述检测当前环境下特定波长的非可见光的环境亮度值包括：
判断当前所述屏下光学检测系统的光源是否处于关闭状态，如果当前所述光源处于开启状态，关闭所述光源；
在所述光源处于关闭状态时，利用所述光学传感器进行亮度检测，并获得所述特定波长的非可见光的环境亮度值。
作为本公开提供的物体接近检测方法的一种可选实现方案，所述检测在所述光源开启状态下所述特定波长的非可见光的实际亮度值包括：
所述光源发出的非可见光在显示屏幕上方的目标物体表面发生反射并形成反射光或者进入所述目标物体内部并从底部出射形成透射光，所述反射光和所述透射光返回所述屏下光学检测系统的显示屏幕并穿过OLED模组；
所述光学传感器接收穿过所述OLED模组的反射光和所述透射光，并根据所述反射光和所述透射光检测当前所述特定波长的非可见光的实际亮度值。
作为本公开提供的物体接近检测方法的一种可选实现方案，根据所述实际亮度值与所述环境亮度值，判断当前目标物体与所述电子设备的接近情况包括：
计算所述实际亮度值和所述环境亮度值的差值；
判断所述差值是否大于设定的阈值，如果是，确定所述目标物体与所述电子设备之间的距离小于预定值。
作为本公开提供的物体接近检测方法的一种可选实现方案，还包括：
在所述目标物体与所述电子设备之间的距离小于预定值时，利用所述电子设备的处理器执行第一事件。
作为本公开提供的物体接近检测方法的一种可选实现方案，所述预定的工作状态为通话状态，且所述第一事件包括控制所述电子设备的显示屏幕处于息屏状态。
作为本公开提供的物体接近检测方法的一种可选实现方案，还包括：
在所述目标物体与所述电子设备之间的距离超过预定值时，利用所述电子设备的处理器执行第二事件，所述第二事件包括控制所述电子设备的 显示屏幕维持亮屏状态。
本公开具有以下有益效果：
本公开提供的屏下光学检测系统、电子设备及其物体接近检测方法，其中，所述屏下光学检测系统包括显示屏幕、光学传感器以及光源；所述显示屏幕包括显示模组和背光模组，所述背光模组设置在所述显示模组下方，所述背光模组包括OLED模组，所述OLED模组的出光面朝向所述显示模组，用于向所述显示模组提供可见光以使所述显示模组显示画面；所述光学传感器设置在所述OLED模组下方；所述光源用于向所述显示屏幕上方的目标物体发出激励光，所述激励光在所述目标物体表面发生反射并形成反射光或者进入所述目标物体内部并从底部出射形成透射光，其中所述反射光和所述透射光返回所述显示屏幕并穿过所述OLED模组，并且被其下方的光学传感器接收以进行屏下光学检测。本公开实施例实现了LCD屏幕显示区域下方检测光信号的功能，增加了OLED模组的可见光出光率，同时还实现了判断物体接近的功能。
附图说明
一个或多个实施例通过与之对应的附图中的图片进行示例性说明，这些示例性说明并不构成对实施例的限定，附图中具有相同参考数字标号的元件表示为类似的元件，除非有特别申明，附图中的图不构成比例限制。
图1是根据本公开的一个实施例的屏下光学检测系统的结构示意图；
图2是根据本公开的另一个实施例的屏下光学检测系统的结构示意图；
图3是适用于本公开提供的屏下光学检测系统的背光模组一种实施例的结构示意图；
图4是图3所示的背光模组第一种具体实现方式的结构示意图；
图5是图3所示的背光模组第二种具体实现方式的结构示意图；
图6是图1所示的屏下光学检测系统的光学检测原理示意图；
图7是根据本公开的一个实施例的物体接近检测方法的流程图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合附图对本公开的各实施例进行详细的阐述。然而，本领域的普通技术人员可以理解，在本公开各实施例中，为了使读者更好地理解本公开而提出了许多技术细节。但是，即使没有这些技术细节和基于以下各实施例的种种变化和修改，也可以实现本公开所要求保护的技术方案。
图1是根据本公开的一个实施例的屏下光学检测系统的结构示意图。如图1所示，该屏下光学检测系统包括：透明盖板10、液晶模组20、背光模组30、光学传感器40以及光源50。液晶模组20设置在透明盖板10下方；背光模组30设置在液晶模组20下方。液晶模组20和背光模组30相互叠合设置形成LCD屏幕90。光学传感器40设置在背光模组30下方，比如具体地设置在背光模组30下方的预设位置，且其光学检测区域至少部分位于LCD屏幕90的显示区域下方。光源50，其设置在背光模组30的下方，并邻近于光学传感器40。
本实施例中，透明盖板10材质透明且抗应力能力强，能够保护LCD屏幕90，比如其可以为玻璃盖板或者蓝宝石盖板。液晶模组20属于显示组件，但是自身不能发光，需要背光模组30提供光源。背光模组30能够发出可见光为液晶模组20提供一个均匀的可见光面光源，以使LCD屏幕90可以显示画面；在本实施例中，背光模组30可以通过光学设计使得其在为液晶模组20提供可见光源的同时，对特定波段的非可见光具有较高的透过率。
光学传感器40可以为例如CMOS图像传感器、CCD图像传感器或者其他类型的光学传感器，其设置在背光模组30下方，用于通过屏下光学检测的方式检测LCD屏幕90上方的目标物体的特征信息。比如，若上述目标物体为靠近或按压在LCD屏幕90(或者其表面的透明盖板10)的手指或者其他人体部位时，光学传感器40可以用于检测上述手指的指纹信息或者其他生物特征信息(比如心率、血氧浓度等)，也可以检测上述其他人体部位的其他光学信息(比如上述其他人体部位与LCD屏幕90之间的距离或者相对位置信息等)。
光源50可以是与背光模组30的发光波长不同的光源，并且可以为光学传感器40的屏下光学检测提供激励光，上述激励光的波长具体跟光学 传感器40的工作波长相对应，比如，上述激励光的波长和光学传感器40的工作波长
可以具体位于背光模组30的穿透波长范围(即上述可以穿透背光模组30的特定波段的非可见光的波长范围)之内。作为一种可选的实施例，光源50可以是红外光源，比如红外发光二极管(LED)，其可以提供红外光来作为光学传感器40的激励光。
图2是根据本公开的另一个实施例的屏下光学检测系统的结构示意图。与图1不同之处在于，图2所示的实施例中，光源50与LCD屏幕90并排设置在透明盖板10下方。比如，透明盖板10除了包括覆盖由液晶模组20和背光模组30形成的LCD屏幕90的主体部以外，还相较于LCD屏幕90具有一个延伸部，上述延伸部可以位于所述屏下光学检测系统所在的电子设备的边缘区域。其中，光源50和LCD屏幕90分别并排地设置在透明盖板10的主体部和延伸部的下方。并且，光源50和LCD屏幕90之间具有一定的间隙，可选地，光源50和LCD屏幕90之间的间隙也可以填充遮光材料或者设置其他部件。
同时，在透明盖板10与光源50之间还可以设置有涂层60。本实施例中，涂层60可以预先涂覆透明盖板10下表面的用于设置光源50的区域，其可以透过非可见光，比如上述光源50发出的特定波段的非可见光，还可以隔离可见光，即涂层60不能透过可见光以防止用户可以通过透明盖板10看到下面的光源50。
如前面所述，通常LCD屏幕的背光模组采用反射膜、导光板、匀光膜和棱镜膜等形成的叠层结构来提供面光源，其不能透过背光模组下方的光源发出的激励光以及上述激励光在LCD屏幕上方目标物体表面反射回来的检测光，因而无法支持通过LCD屏幕下方的光学传感器进行屏下光学检测来获得目标物体的光学信息。本实施例提供了一种新型的背光模组设计方案，此方案适用于LCD屏幕的屏下光学检测。
图3是本公开提供的可以适用于图1或图2所示的屏下光学检测系统的背光模组的一种实施例的结构示意图。如图3所示，该背光模组包括：反射膜310以及OLED模组320，OLED模组320与反射膜310相互贴合，比如反射膜310可以贴合在OLED模组320的底面(即与OLED模组的出 光面相背离的表面)，而OLED模组320的出光面可以朝向图1或图2所示的液晶模组20，并且光学传感器40可以设置在反射膜310远离OLED模组320的表面。反射膜310可以反射可见光，同时还可以透过特定波段的非可见光。OLED模组320用于通过其出光面为上述液晶模组20提供一个均匀的可见光面光源，且OLED模组320发出的背离上述出光面的可见光可以被反射膜310反射返回OLED模组320，并从OLED模组320的出光面透射出去，从而一方面提高背光模组30的整体出光效率，另一方面防止OLED模组320发出的可见光进入其底面的光学传感器40而对屏下光学检测造成干扰。
以图1所示的结构为例，当手指或其他目标物体按压在透明盖板10上方时，由于光源50发出的激励光为特定波长的非可见光(光源50的波长位于反射膜310的穿透波长范围之内)，因而上述激励光可以依次穿过反射膜310、OLED模组320、液晶模组20以及透明盖板10，照射到手指或其他目标物体上。其中，一部分光直接被手指或其他目标物体表面反射并形成反射光，另一部分光则进入手指或其他物体后又从手指或其他物体的底部透射出来形成透射光，上述反射光和透射光由于仍然为可以穿透背光模组30的上述特定波段的非可见光，因此可以依次穿过透明盖板10、液晶模组20、OLED模组320和反射膜310之后进入光学传感器40，光学传感器40便可以进行光学信息的检测，也即本实施例的技术方案实现了屏下光学检测的功能。
图4是图3所示的背光模组的第一种具体实现方式的结构示意图，如图所示该背光模组包括：反射膜310以及OLED模组320，OLED模组320又具体包括：封装3201、阴极3202、有机功能层3203、阳极3204和衬底3205。反射膜310可以反射可见光，同时还可以透过特定波段的非可见光。OLED模组320和反射膜310相互贴合，其中，封装3201的一面为反射膜310，另一面为阴极3202；阴极3202的一面为封装3201，另一面为有机功能层3203；有机功能层3203的一面为阴极3202，另一面为阳极3204；阳极3204的一面为有机功能层3203，另一面为衬底3205；衬底3205的一面为阳极3204，另一面为背光模组30的出光面并朝向液晶模组20设置，也即背光模组30的出光方向为有机功能层3203指向衬底3205的方向。
本实施例中，封装3201可以是玻璃、薄膜等材料，可以透过光线，用来隔绝氧气、水汽和灰尘等，来提高OLED模组320的使用寿命。衬底3205可以是玻璃、聚合物等材料，可以透过光线，用来支撑OLED模组320。阴极3202和阳极3204可以是透明电极，可选地，透明电极可以是透明金属电极或者半透明金属电极等。有机功能层3203可以是有机物分子或有机聚合物，可以透过光线。因而OLED模组320整体可以透过光线。
OLED模组320的发光机制为：通过驱动电路给阴极3202和阳极3204施加驱动电压之后，阴极3202的电子就会经由有机功能层3203流向阳极3204，而阳极3204的空穴经由有机功能层3203流向阴极3202，当所述电子与所述空穴在有机功能层3203相遇时，在库仑力的作用下发生结合，产生激子。所述激子在电场作用下将能量传递给有机功能层3203中的有机发光分子，所述有机发光分子吸收能量后将从基态跃迁到激发态。由于处于激发态的所述有机发光分子是不稳定的，需要通过自发辐射回到稳定的基态，这个过程中能量会以光子的方式释放出来，因而OLED模组320可以发出可见光，以作为液晶模组20的背光源。
图5是图3所示的背光模组的第二种具体实现方式的结构示意图，与图4不同之处在于OLED模组320与反射膜310的贴合面不同。具体为，图4当中封装3201的一面为反射膜310，另一面为阴极3202；衬底3205的一面为阳极3204，另一面为背光模组30的出光面并朝向液晶模组20设置。而图5当中封装3201的一面为背光模组30的出光面并朝向液晶模组20设置(也即背光模组30的出光方向为有机功能层3203指向封装3201的方向)，另一面为阴极3202；衬底3205的一面为阳极3204，另一面为反射膜310。
图6是图1所示的屏下光学检测系统的光学检测原理示意图，以目标物体为手指80为例，上述屏下光学检测系统可以用来检测按压在其表面的手指80的指纹信息。
具体而言，光源50发出激励光70，激励光70为上述特定波长的非可见光，其与光学传感器40的工作波长一致。激励光70依次穿过背光模组30、液晶模组20、透明盖板10到达手指80。此时激励光70的一部分被手指80表面反射，形成反射光71；另一部分进入手指80内部，经过一系 列路径从手指80的底部穿出后形成透射光72。反射光71和透射光72再依次经由透明盖板10、液晶模组20和背光模组30后到达光学传感器40(这里光学传感器40的工作波长与反射光71和透射光72的波长相同，且光学传感器40可以为光学指纹传感器)。光学传感器40检测到光学信号后，传送给处理器(图中并未画出)处理，所述处理器依据得到的光学信号，将手指80的指纹图像恢复出来，再与所述屏下光学检测系统数据库中已认证指纹图像进行对比来进行身份识别。
应该理解，图6所示的屏下光学指纹检测只是上述屏下光学检测系统的一种具体应用；在其他实施例中，上述屏下光学检测系统还可以用来进行其他目标物体的光学检测。比如，当上述屏下光学检测系统应用在智能手机或者平板电脑等电子设备时，其可以进行物体接近检测。具体地，基于上述屏下光学检测系统，本公开还提供一种物体接近检测方法。
图7是根据本公开的一个实施例的物体接近检测方法的流程图，如图7所示，该方法包括：
步骤S101，获取当前电子设备所处工作状态。
步骤S102，判断当前所述工作状态是否为预定工作状态，如果是，则执行步骤S103，否则执行步骤S108。
在本步骤中，上述预定工作状态可以根据实际情况进行定义，比如，作为一种实施例，所述预定工作状态可以为通话状态，在这种情况下，所述电子设备可以启用屏下光学检测系统进行物体接近检测，用以检测用户头部与电子设备之间的距离，并进行相应的控制。步骤S108为执行其他操作，比如响应用户控制并执行相应的操作。
步骤S103，检测当前环境下特定波长的非可见光的环境亮度值，并将所述环境亮度值记为L1，其中所述非可见光的波长与所述屏下光学检测系统的光源50的发光波长相对应。
在具体实施例中，上述特定波长的非可见光可以具体是与所述屏下光学检测系统的光学传感器40的工作波长相对应的非可见光，比如红外光。
在步骤S103中，在检测上述环境亮度值L1之前，需要判断所述屏下光学检测系统的光源50是否处于关闭状态，如果当前光源50处于开启状态，则所述屏下光学检测系统需要关闭光源50，为检测当前所述环境亮度 值L1做准备。在光源50处于关闭状态时，利用光学传感器40进行亮度检测，并获得环境亮度值L1。
步骤S104，检测在光源50开启状态下所述特定波长的非可见光的实际亮度值，并将所述实际亮度值记为L2；
光源50开启状态下会发出上述特定波长的非可见光作为激励光，所述激励光穿过背光模组30、液晶模组20和透明盖板10之后，从透明盖板10的表面出射。当物体80靠近所述电子设备时，光源50发出的激励光会在物体80表面发生反射并形成反射光或者进入目标物体80内部并从底部出射形成透射光，所述反射光和所述透射光的波长与所述激励光相对应，即所述反射光和所述透射光同样为上述特定波长的非可见光。因此，从物体80返回的反射光和透射光依次穿过透明盖板10、液晶模组20和背光模组30之后进入到光学传感器40，光学传感器40便可以检测到光源50开启状态下所述特定波长的非可见光的实际亮度值L2。
其中，物体80越靠近所述电子设备，所述反射光和所述透射光的光强就会越强，光学传感器40检测到的上述特定波长的非可见光的实际亮度值就会越大。当物体80逐渐靠近所述电子设备时，上述实际亮度值L2逐渐增大，当物体80与所述电子设备的距离达到某一距离时，光源50开启状态下的实际亮度值L2大于上述环境亮度值L1；而且物体80越靠近所述电子设备，实际亮度值L2就越大于环境亮度值L1。因此，可以根据上述实际亮度值L2与环境亮度值L1，判断当前物体80与所述电子设备的接近情况。
步骤S105，判断所述实际亮度值L2与所述环境亮度值L1的差值(L2-L1)是否大于设定的阈值；如果是，执行步骤S106，否则执行步骤S107。
具体地，这个阈值通过实际调试的距离确定，当上述实际亮度值L2与环境亮度值L1的差值(L2-L1)大于该阈值，就可以确定物体80与所述电子设备之间的距离已经小于所述预定值。例如手机处于通话状态时，如果手机和头部距离小于一定距离，此时可以通过所述电子设备的处理器触发LCD屏幕90息屏，以达到省电的目的。如果上述差值(L2-L1)小于该阈值，则意味着物体80并没有遮挡手机，因此可以通过所述处理器 维持亮屏或者执行其他操作。
步骤S106，处理器执行第一事件；所述第一事件可以是控制LCD屏幕90处于息屏状态，也可以是其他操作。
步骤S107，处理器执行第二事件；所述第二事件可以是控制LCD屏幕90维持亮屏状态，也可以是控制其他功能部件执行其他操作。
虽然本公开文件包含许多细节，但是这些不应被解释为对任何发明或要求保护的范围的限制，而是被解释为可以是对特定发明的特定实施例所特有的特征的描述。本专利文件中描述的某些特征在单独实施例的上下文中还可以在单个实施例中组合实现。相反，在单个实施例的上下文中描述的各种特征还可以在多个实施例中单独实现或以任何合适的子组合形式实现。而且，虽然特征可以在上面描述为在某些组合中起作用，并且甚至最初如此要求保护，但是来自要求保护的组合的一个或多个特征在一些情况下可以从组合中删除，并且要求保护的组合可以涉及子组合或子组合的变形。
类似地，虽然在附图中以特定顺序描述了操作，但是这不应理解为要求这些操作以所示的特定顺序或按照顺序依次执行，或者要求执行所有所示的操作，以实现期望的结果。而且，在本专利文件中描述的实施例中的各种单独的系统部件不应理解为在所有实施例中需要这种分离。
本领域的普通技术人员可以理解，上述各实施例是实现本申请的具体实施例，而在实际应用中，可以在形式上和细节上对其作各种改变，而不偏离本申请的范围。

Claims (20)

  1. 一种屏下光学检测系统，其特征在于，包括显示屏幕、光学传感器以及光源；
    所述显示屏幕包括显示模组和背光模组，所述背光模组设置在所述显示模组下方，所述背光模组包括OLED模组，所述OLED模组的出光面朝向所述显示模组，用于向所述显示模组提供可见光以使所述显示模组显示画面；
    所述光学传感器设置在所述OLED模组下方；
    所述光源用于向所述显示屏幕上方的目标物体发出激励光，所述激励光在所述目标物体表面发生反射并形成反射光或者进入所述目标物体内部并从底部出射形成透射光，其中所述反射光和所述透射光返回所述显示屏幕并穿过所述OLED模组，并且被其下方的光学传感器接收以进行屏下光学检测。
  2. 根据权利要求1所述的屏下光学检测系统，其特征在于，所述背光模组还包括反射膜，所述反射膜贴合在所述OLED模组的底面，所述底面为与所述OLED模组的出光面相背离的表面。
  3. 根据权利要求2所述的屏下光学检测系统，其特征在于，所述反射膜用于将所述OLED模组发出的可见光反射至所述显示模组，并且将所述反射光和所述透射光透射到所述OLED模组下方的光学传感器。
  4. 根据权利要求3所述的屏下光学检测系统，其特征在于，所述光源发出的激励光为具有特定波长的非可见光，其中所述非可见光的波长位于所述反射膜的穿透波长范围之内。
  5. 根据权利要求4所述的屏下光学检测系统，其特征在于，所述光源为红外光源，且所述反射膜对红外光具有穿透性而对可见光具有反射能力。
  6. 根据权利要求1所述的屏下光学检测系统，其特征在于，所述显示屏幕为LCD屏幕，且所述显示模组为液晶模组。
  7. 根据权利要求1所述的屏下光学检测系统，其特征在于，所述光源设置在所述背光模组下方，并邻近于所述光学传感器设置。
  8. 根据权利要求1所述的屏下光学检测系统，其特征在于，所述屏下光学检测系统还包括设置在所述显示屏幕上方的透明盖板，所述透明盖板包括覆盖在所述显示屏幕的主体部以及从所述主体部边缘延伸出的延伸部，所述光源设置在所述延伸部的下方。
  9. 根据权利要求8所述的屏下光学检测系统，其特征在于，所述屏下光学检测系统还包括涂层，所述涂层设置在所述透明盖板与所述光源之间，用于透射所述光源发出的激励光，并隔离所述OLED模组发出的可见光。
  10. 根据权利要求1所述的屏下光学检测系统，其特征在于，所述光源发出的激励光的波长与所述背光模组提供的可见光的波长不同，且所述激励光的波长与所述光学传感器的工作波长相对应。
  11. 根据权利要求1所述的屏下光学检测系统，其特征在于，所述光学传感器为光学指纹传感器，在所述目标物体为用户手指时，所述光学指纹传感器用于接收穿过所述OLED模组的反射光和透射光，并根据所述反射光和所述透射光获取所述手指的指纹图像。
  12. 一种电子设备，其特征在于，包括：
    根据权利要求1至11中任一项所述的屏下光学检测系统。
  13. 根据权利要求12所述的电子设备，其特征在于，所述电子设备还包括外壳，所述屏下光学检测系统至少部分设置在所述外壳内部。
  14. 一种物体接近检测方法，应用在如权利要求12所述的电子设备，其特征在于，所述物体接近检测方法包括：
    获取当前电子设备所处工作状态；
    判断当前所述工作状态是否为预定工作状态，如果是，检测当前环境下特定波长的非可见光的环境亮度值，其中所述非可见光的波长与所述屏下光学检测系统的光源的发光波长相对应，否则执行其他操作；
    检测在所述光源开启状态下所述特定波长的非可见光的实际亮度值；
    根据所述实际亮度值与所述环境亮度值，判断当前目标物体与所述电子设备的接近情况。
  15. 根据权利要求14所述的物体接近检测方法，其特征在于，所述检测当前环境下特定波长的非可见光的环境亮度值包括：
    判断当前所述屏下光学检测系统的光源是否处于关闭状态，如果当前所述光源处于开启状态，关闭所述光源；
    在所述光源处于关闭状态时，利用所述光学传感器进行亮度检测，并获得所述特定波长的非可见光的环境亮度值。
  16. 根据权利要求14所述的物体接近检测方法，其特征在于，所述检测在所述光源开启状态下所述特定波长的非可见光的实际亮度值包括：
    所述光源发出的非可见光在显示屏幕上方的目标物体表面发生反射并形成反射光或者进入所述目标物体内部并从底部出射形成透射光，所述反射光和所述透射光返回所述屏下光学检测系统的显示屏幕并穿过OLED模组；
    所述光学传感器接收穿过所述OLED模组的反射光和透射光，并根据所述反射光和所述透射光检测当前所述特定波长的非可见光的实际亮度值。
  17. 根据权利要求16所述的物体接近检测方法，其特征在于，根据所述实际亮度值与所述环境亮度值，判断当前目标物体与所述电子设备的接近情况包括：
    计算所述实际亮度值和所述环境亮度值的差值；
    判断所述差值是否大于设定的阈值，如果是，确定所述目标物体与所述电子设备之间的距离小于预定值。
  18. 根据权利要求17所述的物体接近检测方法，其特征在于，还包括：
    在所述目标物体与所述电子设备之间的距离小于预定值时，利用所述电子设备的处理器执行第一事件。
  19. 根据权利要求18所述的物体接近检测方法，其特征在于，所述预定工作状态为通话状态，且所述第一事件包括控制所述电子设备的显示屏幕处于息屏状态。
  20. 根据权利要求19所述的物体接近检测方法，其特征在于，还包括：
    在所述目标物体与所述电子设备之间的距离超过预定值时，利用所述电子设备的处理器执行第二事件，所述第二事件包括控制所述电子设备的 显示屏幕维持亮屏状态。
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