WO2020181443A1 - 生物特征检测模组和背光模组及电子装置 - Google Patents

生物特征检测模组和背光模组及电子装置 Download PDF

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Publication number
WO2020181443A1
WO2020181443A1 PCT/CN2019/077585 CN2019077585W WO2020181443A1 WO 2020181443 A1 WO2020181443 A1 WO 2020181443A1 CN 2019077585 W CN2019077585 W CN 2019077585W WO 2020181443 A1 WO2020181443 A1 WO 2020181443A1
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WIPO (PCT)
Prior art keywords
detection
backlight
light
backlight module
module
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Application number
PCT/CN2019/077585
Other languages
English (en)
French (fr)
Inventor
王小明
林峰
田浦延
Original Assignee
深圳阜时科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 深圳阜时科技有限公司 filed Critical 深圳阜时科技有限公司
Priority to CN201980000393.7A priority Critical patent/CN110062908A/zh
Priority to PCT/CN2019/077585 priority patent/WO2020181443A1/zh
Publication of WO2020181443A1 publication Critical patent/WO2020181443A1/zh

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    • 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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • This application relates to the field of optoelectronic technology, and in particular to a biological feature detection module, a backlight module and an electronic device.
  • under-screen biometric detection technology has emerged, that is, the biometric detection module is placed under the display screen, and the detection beam is sent or received through the display screen to achieve biometric detection.
  • the biometric detection module is placed under the display screen, and the detection beam is sent or received through the display screen to achieve biometric detection.
  • non-self-luminous type display screens such as liquid crystal display screens
  • under-screen biometric detection needs to solve the problem of the screen's detection beam transmittance.
  • Some manufacturers have introduced a scheme of placing the biometric detection module under the backlight module and opening holes on the entire display screen and the backlight module.
  • this solution can achieve under-screen biometric detection, it requires relatively complex processes and high product costs.
  • due to the need to open holes on the screen the visual effect and aesthetics of the overall display of the screen are poor. The resulting light leakage and uneven display also lead to poor experience and effect of under-screen biometric detection.
  • the present application provides an under-screen biometric detection module, backlight module and electronic device for solving the problems of the prior art.
  • a biometric detection module can receive a detection beam emitted and/or reflected by an external object through the backlight module, and the detection beam is used by the biometric detection module. Or other light sources are emitted to an external object or the detection beam is emitted from an external object. The detection beam is used for the detection and identification of the biological information of the external object.
  • the backlight module can provide a backlight beam for a display panel.
  • the backlight module includes a reflective sheet capable of transmitting the detection beam and reflecting the backlight beam.
  • the biometric detection module is at least partially arranged below the reflective sheet, and the reflective sheet is made up of multiple layers of optical films that have different refractive indices for the detection beam and the backlight beam.
  • the reflective sheet is a nanoporous film.
  • the backlight module further includes a light guide plate and an optical sheet sequentially arranged on the reflective sheet, and a backlight source arranged on one side of the light guide plate, the backlight source is used to emit a backlight beam, the The reflective sheet is used to reflect the backlight beam emitted by the backlight source to the light guide plate and allow the detection beam to pass through directly.
  • the light guide plate includes a light exit surface adjacent to the optical sheet, and the light guide plate is used to allow entry from its side The backlight beam exits the light exit surface and enters the optical sheet.
  • the reflective sheet includes an optical substrate and a plurality of interconnected and uniformly distributed microstructures arranged in the optical substrate, the microstructures having the same or close to the wavelength or wavelength range of the backlight beam
  • the diameter of the micro-hole structure is smaller than the wavelength of the detection beam.
  • the microstructure has a transmittance of more than 80% for light beams with wavelengths above 800 nm, and a reflectivity of more than 90% for light beams with wavelengths below 780 nm, and the detection beam is infrared with a wavelength range of 800 nm to 1000 nm.
  • the backlight beam is visible light with a wavelength below 780 nm
  • the diameter of the microstructure is between 400 nm and 700 nm.
  • the reflective sheet is mixed with particles that highly scatter visible light and highly transmit infrared light; or the reflective sheet is covered with particles that highly scatter visible light and highly transmit infrared light on its upper or lower surface; Or, the reflective sheet can also be processed by chemical etching or mechanical polishing on its upper or lower surface to form a micro-surface structure that highly scatters visible light and transmits infrared light.
  • the optical sheet includes a diffusion sheet, and the diffusion sheet is a quantum dot film.
  • the backlight source is used to emit blue light backlight beams and enter the diffuser through the light guide plate, wherein part of the blue light is converted into green light and red light by the diffuser, and the other part of the blue light and The green light and red light are mixed into white light and then scattered.
  • the detection light is infrared light or near-infrared light
  • the diffusion effect of the diffusion sheet on the backlight beam is greater than that of the detection light
  • the backlight module further includes an anti-reflection film, and the anti-reflection film is disposed on the lower surface of the reflection sheet for improving the transmittance of the reflection sheet to the detection light beam.
  • the detection beam is infrared light or near-infrared light
  • the backlight beam is visible light
  • the biological feature detection module is at least partially arranged below the backlight module, and the biological feature detection module can emit a detection beam to an external object through the backlight module, or directly emit a detection beam To external objects.
  • the biometric detection module includes a transmitting unit and a receiving unit, and the receiving unit can receive the detection light beam from the transmitting unit reflected by an external object through the backlight module, and the transmitting unit is arranged at Below, or on the side of the reflective sheet or integrated in the backlight module, the emitting unit is used to emit the detection beam to an external object.
  • the biometric detection module includes a transmitting unit and a receiving unit.
  • the detection light beam emitted by the transmitting unit is emitted to the outside through the backlight module and a display panel, or the transmitting unit.
  • the detection light beam emitted by the unit is directly emitted to the outside through the display panel, or the detection light beam emitted by the emitting unit is directly emitted to the outside; the detection light beam is emitted to the outside and reflected by an external object and can pass through the display panel and the backlight module
  • the biometric detection module can collect the two-dimensional or three-dimensional biometric information of the external object according to the received detection light beam to realize biometric detection and identification.
  • One aspect of the application discloses a display including any one of the above-mentioned backlight module and a display panel, and the backlight module is used to provide a backlight beam to the display panel to realize image display.
  • a biological feature detection module which can receive a detection beam for biological feature detection and recognition through the aforementioned backlight module, and the backlight module can provide a backlight beam for a display panel,
  • the backlight module includes a reflective sheet capable of transmitting the detection beam and reflecting the backlight beam.
  • the biometric detection module performs fingerprint recognition or/and three-dimensional facial recognition or/and living body detection according to the received detection light beam.
  • an electronic device including a display and a biometric detection module arranged below the display, the display includes a backlight module and a display panel, the backlight module is arranged on the display panel Below, the biometric detection module is at least partially disposed below the backlight module, and the biometric detection module can receive information for biometric detection and recognition through the display area of the display panel and the backlight module.
  • the light beam is detected, wherein the backlight module is the aforementioned backlight module.
  • the electronic device, the backlight module and the biometric detection module of the present application adopt a backlight module with good transmittance to the detection beam and extremely high reflectivity to the backlight beam, thereby eliminating the need for a backlight module.
  • Holes on the group can realize under-screen biometric detection and recognition, and have a better overall visual effect and user experience, so that the under-screen biometric detection effect of the present application is better, and the process cost is also reduced on the one hand.
  • Figure 1 is a three-dimensional schematic diagram of an embodiment of the present application.
  • Fig. 2 is a schematic partial cross-sectional view of the embodiment shown in Fig. 1;
  • FIG. 3 is a schematic diagram of the transmittance curve of the reflective sheet of the embodiment shown in FIG. 1;
  • Fig. 4 is a partial structural diagram of the embodiment shown in Fig. 1;
  • FIG. 5 is a partial structural diagram of the embodiment shown in FIG. 1;
  • Fig. 6 is a schematic diagram of an embodiment of the present application.
  • Fig. 7 is a schematic diagram of an embodiment of the present application.
  • An embodiment of the present application provides a backlight module.
  • a biometric detection module can receive a detection beam emitted and/or reflected by an external object through a backlight module, and the detection beam is detected by the biometric detection module.
  • Group or other light sources are emitted to an external object, or the detection beam is emitted from an external object, the detection beam is used for the detection and identification of the biological feature information of the external object, and the backlight module can provide a backlight beam for a display panel
  • the backlight module includes a reflective sheet capable of transmitting the detection beam and reflecting the backlight beam.
  • the biometric detection module is at least partially arranged under the reflection sheet, and the reflection sheet is composed of multiple layers of optical films whose refractive indexes are not completely the same for the detection beam and the backlight beam.
  • the backlight module further includes a light guide plate and an optical sheet sequentially arranged on the reflective sheet, and a backlight source provided on one side of the light guide plate, the backlight source is used to emit a backlight beam, and the reflective sheet is used for Reflect the backlight beam emitted by the backlight to the light guide plate and allow the detection beam to pass through directly.
  • the light guide plate includes a light exit surface adjacent to the optical sheet, and the light guide plate is used to make the backlight beam entering from the side of the The light exit surface exits and enters the optical sheet.
  • the reflective sheet includes an optical substrate and a plurality of interconnected and uniformly distributed microstructures arranged in the optical substrate, and the microstructures are microstructures having a diameter that is the same as or close to the wavelength or wavelength range of the backlight beam.
  • a hole structure, and the diameter of the micro-hole structure is smaller than the wavelength of the detection beam.
  • the biological feature detection module is at least partially disposed below the backlight module, and the biological feature detection module can emit a detection beam to an external object through the backlight module, or directly emit a detection beam to an external object .
  • the biometric detection module includes a transmitting unit and a receiving unit.
  • the receiving unit can receive the detection light beam from the transmitting unit reflected by an external object through the backlight module, and the transmitting unit is arranged on the reflective sheet. Below, or on the side or integrated in the backlight module, the emitting unit is used to emit the detection beam to an external object.
  • the biometric detection module includes a transmitting unit and a receiving unit.
  • the detection light beam emitted by the transmitting unit is emitted to the outside through the backlight module and a display panel, or the detection light emitted by the transmitting unit
  • the light beam is directly emitted to the outside through the display panel, or the detection light beam emitted by the emitting unit is directly emitted to the outside; the detection light beam is emitted to the outside and reflected by an external object, and can pass through the display panel and the backlight module to reach the
  • the biological feature detection module can collect the two-dimensional or three-dimensional biological feature information of the external object according to the received detection light beam so as to realize the biological feature detection and recognition.
  • a biological feature detection module which can receive a detection beam for biological feature detection and recognition through the aforementioned backlight module, and the backlight module can provide a backlight beam for a display panel.
  • the backlight module includes a reflective sheet capable of transmitting the detection beam and reflecting the backlight beam.
  • an electronic device including the above-mentioned backlight module, which includes a display and a biometric detection module arranged below the display, the display includes a backlight module and a display panel, the backlight The module is arranged under the display panel, the biological feature detection module is at least partially arranged under the backlight module, and the backlight module is the aforementioned backlight module.
  • an electronic device includes a liquid crystal display 1 and a biological feature detection module 2 arranged under the liquid crystal display 1.
  • the liquid crystal display 1 includes a backlight module 10 and a liquid crystal display panel 11, and the backlight module 10 is arranged under the liquid crystal display panel 11.
  • the biometric detection module 2 is adjacent to the backlight module 10.
  • the biometric detection module 2 is at least partially arranged under the backlight module 10.
  • the biometric detection module 2 can transmit and/or receive detection light beams through the backlight module 10 and the liquid crystal display panel 11 of the liquid crystal display 1.
  • the biological feature detection module 2 can receive the detection light beam reflected by an external object through the backlight module 10.
  • the detection light beam is emitted to an external object by the biological feature detection module or other light source, or the detection light beam is a light beam emitted by the external object that can be used for the detection and identification of the biological feature of the external object.
  • the biometric detection module 2 includes a transmitting unit 21 and a receiving unit 22.
  • the transmitting unit 21 and the receiving unit 22 may be separate chip units or integrated into one chip unit.
  • the transmitting unit 21 and the receiving unit 22 in FIG. 1 are only schematic representations, and do not represent the transmitting unit 21 and the receiving unit. 22 and any limitations on the shape, structure and positional relationship between them.
  • the receiving unit 22 may be arranged under the backlight module 10; the transmitting unit 21 is either arranged under the backlight module 10 or arranged under the backlight module 10
  • the side of the module is either integrated in the backlight module 10 or arranged above the backlight module 10.
  • the emitting unit 21 and the backlight module 10 are arranged at a distance or close to the side of the backlight module 10.
  • the side includes but is not limited to the upper side, or the lower side, or part of the side, etc.
  • the side here can be understood as at least one projection of the emitting unit 21 on the liquid crystal display panel 11. At least a part and the backlight module do not overlap in the projection direction.
  • the detection light beam emitted by the emitting unit 21 can be reflected by an external object (for example, a finger or a human face) and then received by the receiving unit 22 through the backlight module 10.
  • an external object for example, a finger or a human face
  • the transmitting unit 21 and the receiving unit 22 are both arranged under the backlight module 10.
  • the emission unit 21 is arranged on the side or above the backlight module, or the emission unit is integrated in the backlight In the module; the receiving unit 22 is arranged under the backlight module 10.
  • the biometric detection module 2 can transmit and/or receive detection light beams through the backlight module 10.
  • the transmitting unit 21 can transmit a detection light beam to an external object through the backlight module 10 or not transmit a detection light beam to an external object through the backlight module 10, and the receiving unit 22 can transmit a detection light beam to an external object through the backlight module 10
  • the module 10 receives the detection light beam reflected by an external object.
  • the receiving unit 22 can also receive other light beams emitted and/or reflected by an external object through the backlight module 10.
  • the diffusion effect of the backlight module 10 on the backlight beam is greater than the diffusion effect on the detection beam.
  • the detection beam can be used for the detection and identification of the biological characteristic information of the external object.
  • the emitting unit 21 can be used to emit the first detection light beam 101, and the first detection light beam 101 can be emitted to the outside through the liquid crystal display 1.
  • the receiving unit 22 can be used to receive the second detection light beam 102, and the second detection light beam 102 may include a light beam that passes through the liquid crystal display 1 and reaches the receiving unit 22.
  • the second detection light beam 102 may include the reflected light after the first detection light beam 101 is reflected on an external object, and then reaches the receiving unit 22 after passing through the liquid crystal display panel 11 and the backlight module 10.
  • the second detection beam 102 is substantially a reflected beam of the first detection beam 101 on an external object.
  • the first detection light beam 101 is emitted by the transmitting unit 21, and the second detection light beam 102 is received by the receiving unit 22.
  • the biometric detection module 2 can obtain two-dimensional and/or three-dimensional image information or biometrics of an external object. information.
  • the external object may be the user's finger, face, iris or other objects with identifiable biological characteristics.
  • the second detection beam 102 may also include other beams emitted or reflected by an external object, instead of the reflected beam of the first detection beam 101.
  • the second detection beam 102 may also include visible light emitted or reflected by an external object, and the receiving unit 22 can also receive the second detection beam 102 of visible light reflected by the external object to obtain visible light image information of the external object; or second detection
  • the light beam 102 may also include infrared light emitted or reflected by an external object, such as radiant infrared light emitted by a biological body, so as to be able to detect biological signs of the external object, such as temperature, distance, heartbeat, posture, and so on.
  • the biological feature detection module 2 can obtain two-dimensional image information or biological feature information of the external object through the second light beam 102 reflected or emitted by the external object.
  • the biometric detection module 2 may also include a processor (not shown), which can calculate the offset of the second light beam 102 with respect to the first light beam 101 to obtain depth information of the external object. Further, the processor also pre-stores biometric information data, and the processor can compare the obtained two-dimensional information and/or depth information of the external object with the pre-stored biometric information data to achieve external Object biological feature detection and recognition, such as but not limited to: fingerprint recognition, face recognition, iris recognition, etc.
  • the biometrics detection module 2 can be used to lock or unlock electronic devices (such as mobile phones), verify online payment services, verify financial systems or public security systems, and access control Various products and application scenarios such as system pass verification.
  • the backlight module 10 includes a reflective sheet 110, a light guide plate 120 arranged on the reflective sheet, a backlight source 140 arranged on one side of the light guide plate, and an optical sheet 130 arranged on the light guide plate 120.
  • the backlight source 150 is used to emit a backlight beam, and the light guide plate 120 guides the backlight beam into the optical sheet 130.
  • the backlight beam is emitted from a light exit surface of the light guide plate 120 (the light guide plate 120 in FIG. The surface of the diffusion sheet 131) enters the optical sheet 130.
  • the reflective sheet 110 can be used to reflect the backlight beam emitted from the backlight source 140 from the bottom surface of the light guide plate 12 back to the light guide plate 120 and allow the detection beams (first detection beam 101 and second detection beam 102) Directly through, the light guide plate 120 includes a light exit surface (not numbered) adjacent to the optical sheet 130, and the light guide plate 120 is used to make the backlight beam entering from its side exit the light exit surface and enter the light exit surface. ⁇ optical sheet 130.
  • the reflective sheet 110 and the biological characteristic detection module 2 are arranged closely or spaced apart, and the biological characteristic detection module 2 is at least partially arranged under the reflective sheet 1110.
  • the optical sheet 130 may include one or more diffusion films (Diffusion Film, DF), or one or more Brightness Enhancement Film (BEF), or the diffusion film And the combination of brightening film.
  • the optical sheet 130 may include a lower diffusion sheet, a lower brightness enhancement sheet, and an upper brightness enhancement sheet that are sequentially arranged from bottom to top; or the optical sheet 130 may include a lower diffusion sheet, a lower brightness enhancement sheet, and an upper diffusion sheet that are sequentially arranged from bottom to top.
  • the upper gloss film Regarding the structure and composition of the optical sheet 130, the specification and drawings of the present application are only illustratively described, and are not limited thereto.
  • the optical sheet 130 includes a lower diffusion sheet 131, a lower brightness enhancement sheet 132, an upper diffusion sheet 133, and an upper brightness enhancement sheet 134 which are sequentially arranged from bottom to top.
  • the lower diffusion sheet 131 is arranged close to the light guide plate 120.
  • the lower diffusion sheet 131 and the upper diffusion sheet 133 can be used to diffuse the backlight beam, and the lower brightness enhancement sheet 132 and the upper brightness enhancement sheet 134 can be used to converge the backlight beam and improve the brightness of the beam within the viewing angle.
  • the optical sheet 130 can uniformly mix and converge the backlight beams from the light guide plate 120, thereby improving the uniformity of the backlight beams emitted to the liquid crystal display panel 11 and the brightness in the viewing angle.
  • the backlight source 140 includes a light emitting unit 141.
  • the light-emitting unit 141 may be arranged on a circuit board 142.
  • the light emitting unit 142 may be a light emitting diode (LED), and the light emitting unit 142 can be used for a backlight beam.
  • the backlight beam may be visible light, such as white light, or monochromatic light. In some embodiments, the backlight beam may also be invisible light.
  • the lower diffuser 131 can change the wavelength of a part of the light beam entering the lower diffuser 131 and then pass through the lower diffuser 131 and allow a part to enter the lower diffuser.
  • the light beam of the sheet 131 passes through directly.
  • the diffuser 131 can change a backlight beam with a shorter wavelength into a backlight beam with a different longer wavelength.
  • the backlight source 140 can emit a backlight beam of blue light and enter the lower diffusion sheet 131 through the light guide plate 120, and part of the blue light can be converted into green light and red light by the lower diffusion sheet 131, The other part of the blue light can be mixed with the green light and the red light into white light.
  • the lower brightness enhancement sheet 132, the upper diffusion sheet 133, and the upper brightness enhancement sheet 134 can further uniformly mix and converge the backlight beams of different wavelengths passing through the lower diffusion sheet 131 to form white light, and provide the liquid crystal display panel 11 as display illumination .
  • the lower diffuser 131 may be a quantum dot film, which has the optical characteristics of changing the wavelength of the light beam and the diverging light path, for example, it can lengthen part of the wavelength of the incident blue light and convert it into red light and green light. Light.
  • the transmittance of the quantum dot film to infrared light is not less than 50%.
  • the backlight light beam mentioned in this specification may refer to the light beam emitted by the backlight source 140 in the backlight module 10 and the light beam emitted by the backlight source 140 whose wavelength is changed through the lower diffuser 131. It can also mean white light formed by mixing backlight beams of different wavelengths. The function of all these backlight beams is to provide the liquid crystal display panel 11 with illumination beams required for display.
  • FIG. 3 is a schematic diagram of the transmittance curve of the reflector 110 of the embodiment shown in FIG. 1.
  • the reflector 110 has a transmittance of more than 80% for infrared light with a wavelength range of 900 nm to 1000 nm.
  • the reflective sheet 110 can be used to transmit the detection light beam (when referred to as "detection light beam” below, it means the first detection light beam 101 and/or the second detection light beam 102).
  • the reflective sheet 110 can be used to reflect the backlight beam 103.
  • the backlight beam 103 emitted by the backlight source 140 enters the light guide plate 120 through one side of the light guide plate 120 (ie, the light incident surface), and part of the backlight beam 103 exits through the bottom surface of the light guide plate 120 and reaches the reflective sheet 110.
  • the reflective sheet 110 may be formed by stacking or bonding multiple layers of optical films, and may include tens to hundreds of optical films.
  • Each layer of optical film has a different refractive index for the backlight beam 103 and the detection beam (including the first detection beam 101 and/or the second detection beam 102).
  • the diaphragm enables the backlight beam 103 to be continuously refracted and reflected between the multiple optical films, and the detection beam can pass through the multiple optical films, so that the reflection sheet 110 can transmit the detection beam and reflect the Backlight beam 103.
  • the detection beam (the first detection beam 101 and/or the second detection beam 102) is infrared light, such as infrared light with a wavelength of 800 nm to 1000 nm; the backlight beam 103 is visible light.
  • FIG. 5 illustrates a partial structural diagram of the reflective sheet 110 of the embodiment shown in FIG. 1 in a modified embodiment.
  • the reflective sheet 110 includes an optical substrate 111 and a plurality of microstructures disposed in the optical substrate 111. Structure 112.
  • the microstructure 112 can be used to reflect the backlight beam 103 and transmit the detection beam (including the first detection beam 101 and/or the second detection beam 102).
  • the microstructure 112 may be a micropore structure having a diameter that is the same as or close to the wavelength or wavelength range of the backlight beam 103, and the diameter of the micropore structure is smaller than the wavelength of the detection beam.
  • the optical substrate 111 may optionally be made of polyethylene (PE) material, or polyethylene terephthalate (PET) material or other similar materials with good optical transparency.
  • the microstructure 112 for example, but not limited to, has a high transmittance (above 80%) for light beams with wavelengths above 800 nm, and a very high reflectance (above 90%) for light beams with wavelengths below 780 nm.
  • the interconnected microstructures 112 are evenly distributed in the optical substrate 111.
  • the detection light beams 101 and 102 are light beams with a wavelength above 800 nm, for example, infrared light with a wavelength range of 800 nm to 1000 nm.
  • the backlight beam 103 is a beam with a wavelength below 780 nm, for example, the backlight beam 103 is visible light.
  • the microstructure 112 is a nanopore with a diameter between 50 nm and 1000 nm, or the diameter of the microstructure 112 is between 400 nm and 700 nm.
  • the diameter of the microstructures 112 is similar to the wavelength of visible light, visible light (such as the backlight beam 103 in this embodiment) is incident on the Scatter on the microstructure 112.
  • the micro-hole diameter of the microstructure 112 is smaller than the wavelength of the infrared light (wavelength above 800 nm), the first detection beam 101 and/or the second detection beam 102 of the infrared light can pass through without influence.
  • the backlight source 140 emits the backlight beam 103 including visible light to enter the light guide plate 120 through one side of the light guide plate 120 (that is, the light incident surface of the light guide plate 120), and can enter the light guide plate 120 from the The bottom surface of the light guide plate 120 enters the reflective sheet 110 after exiting and enters the light guide plate 120 after being reflected by the reflective sheet 110.
  • the reflective sheet 110 is preferably a nanoporous film (nanoporous PE) with a thickness of 1 ⁇ m to 20 ⁇ m (micrometers).
  • the microstructure 112 shown in FIG. 5 is only a schematic representation, and does not represent a limitation of a specific structure and positional relationship.
  • the transmitting unit 21 and the receiving unit 22 may be arranged under the reflective sheet 110, and the first detection beam 101 and the second detection beam 102 respectively pass through the reflection ⁇ 110.
  • the transmitting unit 21 may not be arranged under the reflective sheet 110, and the receiving unit 22 may be arranged under the reflective sheet 110, and the first detection beam 101 is not required.
  • the second detection light beam 102 reflected by the external object passes through the reflective sheet 110 and directly reaches the external object, and is received by the receiving unit 22 through the reflective sheet 110.
  • the emission unit 21 may be arranged in the backlight module 10 above the reflective sheet 110; or the emission unit 21 may be arranged above the backlight module 10, located between the backlight module 10 and the liquid crystal display. Between the panels 11; or the emitting unit 21 is arranged on the side outside the backlight module 10 and the liquid crystal display panel 11.
  • the position where the biometric detection module 2 is set corresponds to the middle of the bottom of the liquid crystal display panel 11, or the biometric detection module 2 may also have different positions. , This application is not restricted.
  • the emitting unit 21 is disposed in a part of the water drop-shaped non-display area on the top of the liquid crystal display panel 21 (this type of display panel is commonly referred to as "water droplets"). Screen” or “beauty tip”).
  • the emitting unit is located under a glass cover plate (not shown), and the glass cover plate covers the liquid crystal display panel 11 and the emitting unit 21.
  • the receiving unit 22 is arranged under the backlight module 10. At this time, the electronic device can be used for face detection and recognition.
  • the transmitting unit 21 and the receiving unit 22 are both arranged under the backlight module 10. At this time, the electronic device can be used for fingerprint or face detection. And recognition.
  • the liquid crystal display panel 11 may include two substrates arranged opposite to each other, a liquid crystal layer arranged between the two substrates, and a plurality of thin film transistors arranged on the substrate ( Thin Film Transistor, TFT), multiple gate lines, multiple data lines, multiple pixel electrodes, color filter films, etc., and multiple pixel units formed in an array, as well as data driving circuits and timing control circuits , Power supply circuit, etc.
  • TFT Thin Film Transistor
  • the reflective sheet 110 can also be implemented by mixing particles that highly scatter visible light and highly transmit infrared light; or the reflective sheet 110 can also be implemented on its upper surface or underneath. It can be achieved by covering particles with high scattering of visible light and high transmission of infrared light; or the reflector 110 can also be processed by chemical etching or mechanical polishing on its upper or lower surface to form a high scattering of visible light and high transmission of infrared light. Micro surface structure.
  • the high transmission mentioned here refers to the transmittance greater than 80%, and the high reflection refers to the reflectivity greater than 90%.
  • the reflective sheet 110 may further include the optical substrate 111 as described in the above embodiment.
  • the optical substrate 111 may be made of a transparent material, or may be made of an opaque material.
  • the lower surface of the reflective sheet 110 is provided with an anti-reflection coating, which can further improve the transmittance of the reflective sheet 110 to the detection beam of infrared light.
  • the electronic device may be a mobile phone, a tablet computer, a smart watch, an augmented reality/virtual reality device, a human motion detection device, an autonomous vehicle, a smart home device, a security device, a smart robot or other capable An electronic device used for object biometric detection and recognition.
  • the electronic device, the backlight module and the biometric detection module of the present application adopt a backlight module with good transmittance to the detection beam and extremely high reflectivity to the backlight beam, thereby eliminating the need for a backlight module.
  • Holes on the group can realize the biometric detection and recognition under the screen, which has a better overall visual effect and user experience, and the biometric detection experience under the screen is better, which also reduces the process cost on the one hand.
  • liquid crystal display panel 11 can also be replaced with another suitable type of display panel, such as an electronic paper display panel.
  • any reference to “one embodiment”, “an embodiment”, “an example embodiment”, etc. in this specification means that a specific feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application.
  • the appearances of such phrases in different places in this specification do not necessarily all refer to the same embodiment.
  • a specific feature or structure is described in combination with any embodiment, it is claimed that it is within the technical scope of those skilled in the art to implement such feature or structure in combination with other embodiments of these embodiments.

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Abstract

一种背光模组（10）、生物特征检测模组（2）及电子装置。生物特征检测模组（2）能够透过背光模组（10）接收外部对象发射和/或反射的检测光束，检测光束被生物特征检测模组（2）或其他光源发射至外部对象上或检测光束是外部对象发射，检测光束用于外部对象的生物特征信息的检测和识别，背光模组（10）能够给显示面板（11）提供背光光束，背光模组（10）包括能够透过检测光束且反射背光光束的反射片（110）。背光模组（10）、生物特征检测模组（2）及电子装置具有较好的屏下生物特征检测效果。

Description

生物特征检测模组和背光模组及电子装置 技术领域
本申请涉及光电技术领域，尤其涉及一种生物特征检测模组和背光模组及电子装置。
背景技术
随着技术进步和人们生活水平提高，对于手机、平板电脑、相机等电子产品，用户要求具有更多功能和时尚外观。目前，手机的发展趋势是轻薄、接近全面屏，同时具有前置摄像头自拍和人脸识别等功能。而随着电子设备支持的功能越来越丰富，需要设置的元件数量也越来越多，需要占据一部分电子设备正面的显示区域的位置，影响美观和用户体验。
近来，为了实现全面屏或接近全面屏效果，屏下生物特征检测技术应运而生，也就是将生物特征检测模组放在显示屏的下方，通过显示屏发送或接收检测光束实现生物特征检测。然而对于非自发光类型的显示屏，例如液晶显示屏，屏下生物特征检测需要解决屏幕关于检测光束透过率的问题。部分厂商推出了将生物特征检测模组放在背光模组下方，并对整个显示屏上和背光模组开孔的方案。这种方案虽然能够实现屏下生物特征检测，但需要相对复杂的工艺，产品成本较高，并且由于需要在屏幕上开孔，使得屏幕整体显示的视觉效果和美观较差，并且因为开孔会导致的漏光和显示不均匀，也导致屏下生物特征检测体验和效果较差。
发明内容
有鉴于此，本申请提供一种用于解决现有技术问题的用于屏下 的生物特征检测模组和背光模组及电子装置。
本申请的一个方面公开了一种背光模组，一个生物特征检测模组能够透过该背光模组接收外部对象发射和/或反射的检测光束，所述检测光束被所述生物特征检测模组或其他光源发射至外部对象上或所述检测光束是外部对象发射，所述检测光束用于外部对象的生物特征信息的检测和识别，所述背光模组能够给一个显示面板提供背光光束，所述背光模组包括能够透过所述检测光束且反射所述背光光束的反射片。
可选的，所述生物特征检测模组至少部分设置在所述反射片下方，所述反射片是由多层对所述检测光束和背光光束的折射率不完全相同的光学膜片叠加或贴合构成，或者，所述反射片为纳米多孔膜。
可选的，所述背光模组还包括依次设置在所述反射片上的导光板和光学片、以及设置在所述导光板一侧的背光源，所述背光源用于发射背光光束，所述反射片用于将背光源发射的背光光束反射到导光板并允许所述检测光束直接透过，所述导光板包括一个和光学片邻近的出光面，所述导光板用于使得从其侧面进入的背光光束从所述出光面出射并进入所述光学片。
可选的，所述反射片包括光学基板和设置在所述光学基板中的多个相互连接且均匀分布的微结构，所述微结构为具有和所述背光光束波长或波长范围相同或接近的直径大小的微孔结构，且所述微孔结构直径小于所述检测光束波长。
可选的，所述微结构对800nm以上波长的光束具有80％以上的透过率，对780nm以下波长的光束具有90％以上反射率，所述检测光束为波长范围800～1000nm之间的红外光，所述背光光束为波长780nm 以下的可见光,所述微结构的直径大小为400nm～700nm之间。
可选的，所述反射片在其中参杂对可见光高散射对红外光高透过的颗粒；或者所述反射片在其上表面或下面覆盖对可见光高散射对红外光高透过的颗粒；或者所述反射片还可以通过在其上表面或下表面进行化学蚀刻或机械打磨加工形成对可见光高散射对红外光高透过的微表面结构。
可选的，所述光学片包括扩散片，所述扩散片为量子点膜。
可选的，所述背光源用于发射蓝色光的背光光束并通过所述导光板进入所述扩散片，其中一部分蓝色光被所述扩散片转换为绿色光和红色光，另一部分蓝色光和所述绿色光、红色光混合成白色光后发散射出。
可选的，所述检测光线为红外光或近红外光，所述扩散片对所述背光光束的扩散作用大于对所述检测光线的扩散作用。
可选的，所述背光模组还包括增透膜，所述增透膜设置在所述反射片的下表面，用于提高所述反射片对所述检测光束的透过率。
可选的，所述检测光束为红外光或近红外光，所述背光光束为可见光。
可选的，所述生物特征检测模组至少部分地设置在所述背光模组下方，所述生物特征检测模块能够透过所述背光模组发射检测光束到外部对象上，或直接发射检测光束到外部对象上。
可选的，所述生物特征检测模组包括发射单元和接收单元，所述接收单元能够透过所述背光模组接收外部对象反射的来自所述发射单元的检测光束，所述发射单元设置在所述反射片下方、或侧方或集成在所述背光模组中，所述发射单元用于发射所述检测光束到外部对象上。
可选的，所述生物特征检测模组包括发射单元和接收单元，进行生物特征检测时，所述发射单元发射的检测光束通过所述背光模组和一个显示面板出射到外部，或所述发射单元发射的检测光束直接通过该显示面板出射到外部，或所述发射单元发射的检测光束直接出射到外部；所述检测光束出射到外部并被外部对象反射后能够经过所述显示面板和背光模组到达所述接收单元，所述生物特征检测模组能够根据接收到的检测光束采集外部对象的二维或三维的生物特征信息从而实现生物特征检测和识别。
本申请的一个方面公开了一种显示器，包括上述中任一所述的背光模组和显示面板，所述背光模组用于提供背光光束至显示面板，以实现图像显示。
本申请的一个方面公开了一种生物特征检测模组，其能够透过上述的背光模组接收用于生物特征检测和识别的检测光束，所述背光模组能够给一个显示面板提供背光光束，所述背光模组包括能够透过所述检测光束且反射所述背光光束的反射片。
可选的，所述生物特征检测模组根据接收到的检测光束执行指纹识别或/和三维面部识别或/和活体检测。
本申请的一个方面公开了一种电子装置，包括显示器和设置在所述显示器下方的生物特征检测模组，所述显示器包括背光模组和显示面板，所述背光模组设置在所述显示面板下方，所述生物特征检测模组至少部分设置在所述背光模组下方，所述生物特征检测模组能够透过所述显示面板的显示区域和背光模组接收用于生物特征检测和识别的检测光束，其中，所述背光模组为上述的背光模组。
相较于现有技术，本申请电子装置、背光模组和生物特征检测模组通过采用对检测光束具有良好透过率和对背光光束极高反射率 的背光模组，从而不需要在背光模组上打孔便能实现屏下的生物特征检测和识别，具有较好的整体视觉效果和用户体验，使得本申请屏下生物特征检测效果较好，也从一方面减少了工艺成本。
附图说明
图1是本申请的一个实施例的立体示意图；
图2是图1所示实施例的部分剖面示意图；
图3是图1所示实施例的反射片透过率曲线示意图；
图4是图1所示实施例的部分结构示意图；
图5是图1所示实施例的部分结构示意图；
图6是本申请一个实施例的示意图；
图7是本申请一个实施例的示意图。
具体实施方式
在对本申请实施例的具体描述中，应当理解，当基板、片、层或图案被称为在另一个基板、另一个片、另一个层或另一个图案“上”或“下”时，它可以“直接地”或“间接地”在另一个基板、另一个片、另一个层或另一个图案上，或者还可以存在一个或多个中间层。为了清楚的目的，可以夸大、省略或者示意性地表示说明书附图中的每一个层的厚度和大小。此外，附图中元件的大小并非完全反映实际大小。
本申请的一个实施例提供了一种背光模组，一个生物特征检测模组能够透过一个背光模组接收外部对象发射和/或反射的检测光束，所述检测光束被所述生物特征检测模组或其他光源发射至外部对象上，或所述检测光束是外部对象发射，所述检测光束用于外部对象的生物特征信息的检测和识别，所述背光模组能够给一个显示面板 提供背光光束，所述背光模组包括能够透过所述检测光束且反射所述背光光束的反射片。
所述生物特征检测模组至少部分设置在所述反射片下方，所述反射片是由多层对所述检测光束和背光光束的折射率不完全相同的光学膜片叠加或贴合构成。
所述背光模组还包括依次设置在所述反射片上的导光板和光学片、以及设置在所述导光板一侧的背光源，所述背光源用于发射背光光束，所述反射片用于将背光源发射的背光光束反射到导光板并允许所述检测光束直接透过，所述导光板包括一个和光学片邻近的出光面，所述导光板用于使得从其侧面进入的背光光束从所述出光面出射并进入所述光学片。
所述反射片包括光学基板和设置在所述光学基板中的多个相互连接且均匀分布的微结构，所述微结构为具有和所述背光光束波长或波长范围相同或接近的直径大小的微孔结构，且所述微孔结构直径小于所述检测光束波长。
所述生物特征检测模组至少部分地设置在所述背光模组下方，所述生物特征检测模块能够透过所述背光模组发射检测光束到外部对象上，或直接发射检测光束到外部对象上。
所述生物特征检测模组包括发射单元和接收单元，所述接收单元能够透过所述背光模组接收外部对象反射的来自所述发射单元的检测光束，所述发射单元设置在所述反射片下方、或侧方或集成在所述背光模组中，所述发射单元用于发射所述检测光束到外部对象上。
所述生物特征检测模组包括发射单元和接收单元，进行生物特征检测时，所述发射单元发射的检测光束通过所述背光模组和一个 显示面板出射到外部，或所述发射单元发射的检测光束直接通过该显示面板出射到外部，或所述发射单元发射的检测光束直接出射到外部；所述检测光束出射到外部并被外部对象反射后能够经过所述显示面板和背光模组到达所述接收单元，所述生物特征检测模组能够根据接收到的检测光束采集外部对象的二维或三维的生物特征信息从而实现生物特征检测和识别。
本申请其他实施例还提供了一种生物特征检测模组，能够透过上述的背光模组接收用于生物特征检测和识别的检测光束，所述背光模组能够给一个显示面板提供背光光束，所述背光模组包括能够透过所述检测光束且反射所述背光光束的反射片。
本申请其他实施例还提供了一种包括上述背光模组的电子装置，其包括显示器和设置在所述显示器下方的生物特征检测模组，所述显示器包括背光模组和显示面板，所述背光模组设置在所述显示面板下方，所述生物特征检测模组至少部分设置在所述背光模组下方，所述背光模组为上述的背光模组。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
请参阅图1和图2，本申请的一个实施例中，一个电子装置包括液晶显示器1和设置在所述液晶显示器1下方的生物特征检测模组2。所述液晶显示器1包括背光模组10和液晶显示面板11，所述背光模组10设置在所述液晶显示面板11下方。所述生物特征检测模组2邻近所述背光模组10。所述生物特征检测模组2至少部分地设置在所述背光 模组10下方。所述生物特征检测模组2能够透过液晶显示器1的背光模组10和液晶显示面板11发射和/或接收检测光束。所述生物特征检测模组2能够透过所述背光模组10接收外部对象反射的检测光束。所述检测光束被所述生物特征检测模组或其他光源发射至外部对象上，或所述检测光束是外部对象发射的能够用于外部对象生物特征检测和识别的光束。
所述生物特征检测模组2包括发射单元21和接收单元22。所述发射单元21和接收单元22可以分别是单独的芯片单元，也可是集成在一个芯片单元中，图1中发射单元21和接收单元22仅为示意性表示，不代表发射单元21、接收单元22以及它们之间的形状、结构和位置关系的任何限定。
本申请所述实施例和变更实施例中，所述接收单元22可以设置在所述背光模组10下方；所述发射单元21或者设置在所述背光模组10下方，或者设置在所述背光模组侧方，或者集成在所述背光模组10中，或者设置在所述背光模组10上方。例如但不限于，所述发射单元21和所述背光模组10间隔或紧贴设置在所述背光模组10侧方。所述侧方包括但不限于侧上方、或侧下方、或部分侧方等，这里的侧方可理解为所述发射单元21在所述液晶显示面板11上至少存在一个投影，所述投影的至少一部分和所述背光模组在该投影方向上无重叠。
本申请所述实施例和变更实施例中，所述发射单元21发射的检测光束能够被外部对象(例如手指或人脸)反射后通过背光模组10被所述接收单元22接收。
进一步的实施例中，所述生物特征检测模组2用于指纹检测和识别时，所述发射单元21和接收单元22都设置在所述背光模组10下方。
进一步的实施例中，所述生物特征检测模组2用于人脸检测和识别时，所述发射单元21设置在所述背光模组侧方或上方，或者所述发射单元集成在所述背光模组中；所述接收单元22设置在所述背光模组10下方。
所述生物特征检测模组2能够透过背光模组10发射和/或接收检测光束。所述发射单元21能够透过所述背光模组10发射检测光束到外部对象上或不透过所述背光模组10发射检测光束到外部对象上，所述接收单元22能够透过所述背光模组10接收被外部对象反射的所述检测光束。所述接收单元22还能够通过所述背光模组10接收外部对象发射和/或反射的其他光束。所述背光模组10对背光光束的扩散作用大于对所述检测光束的扩散作用。所述检测光束能够用于外部对象的生物特征信息的检测和识别。
为了描述方便和理解清楚，所述发射单元21能够用于发射第一检测光束101，且所述第一检测光束101能够通过所述液晶显示器1出射到外部。所述接收单元22能够用于接收第二检测光束102，所述第二检测光束102可以包括透过所述液晶显示器1到达所述接收单元22的光束。例如：所述第二检测光束102可以包括所述第一检测光束101在外部对象上发生反射后的反射光中透过所述液晶显示面板11和背光模组10后达到所述接收单元22。这种情况下，所述第二检测光束102实质上为第一检测光束101在外部对象上的反射光束。通过所述发射单元21发射第一检测光束101、所述接收单元22接收第二检测光束102，所述生物特征检测模组2能够获得外部对象的二维和/或三维的图像信息或生物特征信息。所述的外部对象可以为用户的手指，脸部，虹膜或其他具有可识别生物特征的对象。
此外，所述第二检测光束102还可以包括外部对象发射或反射的 其他光束，而非第一检测光束101的反射光束。例如，第二检测光束102还可以包括外部对象发射或反射的可见光，所述接收单元22还能够接收外部对象反射的可见光的第二检测光束102从而获得外部对象的可见光图像信息；或者第二检测光束102还可以包括外部对象发射或反射的红外光，例如生物体发射的辐射红外光，从而能够检测外部对象的生物体征，例如温度，距离，心跳，体态，等等。
所述生物特征检测模组2通过外部对象反射或发射的第二光束102能够获取外部对象二维的图像信息或生物特征信息。所述生物特征检测模组2还可以包括处理器(图未示)，所述处理器能够计算所述第二光束102关于第一光束101的偏移进而获得外部对象的深度信息。进一步的，所述处理器还预先存储生物特征信息数据，所述处理器能够通过将获得的外部对象的二维信息和/或深度信息和预先存储的生物特征信息数据进行比对，从而实现外部对象的生物特征检测和识别，例如但不限于：指纹识别，脸部识别，虹膜识别等。
通过对外部对象的生物特征进行检测和识别，所述生物特征检测模组2可应用于电子装置(如：手机)的锁定或解锁，在线支付业务验证，金融***或公安***的身份验证，门禁***的通行验证等多种产品和应用场景。
如图1和图2所示，所述背光模组10包括反射片110、设置在反射片上的导光板120、设置在导光板一侧的背光源140、设置在导光板120上的光学片130。所述背光源150用于发射背光光束，所述导光板120将背光光束导入所述光学片130，具体地，背光光束从所述导光板120的一个出光面(图2中导光板120邻近所述下扩散片131的表面)进入所述光学片130。所述反射片110能够用于将背光源140发射的从所述导光板12底面出射的背光光束反射回到所述导光板120并允许所 述检测光束(第一检测光束101和第二检测光束102)直接透过，所述导光板120包括一个和光学片130邻近的出光面(未标号)，所述导光板120用于使从其侧面进入的背光光束从所述出光面出射并进入所述光学片130。所述反射片110和所述生物特征检测模组2紧贴或间隔设置，所述生物特征检测模组2至少部分地设置在所述反射片1110下方。
所述实施例和变更实施例中，所述光学片130可以包括一个或多个扩散片(Diffusion Film，DF)，或者一个或多个增光片(Brightness Enhancement Film，BEF)，或者所述扩散片和增光片的组合。例如所述光学片130可以包括从下至上依次设置的下扩散片，下增光片和上增光片；或者所述光学片130包括从下至上依次设置的下扩散片、下增光片、上扩散片和上增光片。关于光学片130的结构和组成，本申请说明书和附图仅作示意性说明，并不以此为限定。
本实施例中，所述光学片130包括从下至上依次设置的下扩散片131、下增光片132、上扩散片133和上增光片134。所述下扩散片131紧贴所述导光板120设置。所述下扩散片131、上扩散片133能够用于扩散背光光束，所述下增光片132、上增光片134能够用于会聚背光光束并在可视角度内提高光束亮度。
因此，所述光学片130能够将来自导光板120的背光光束进行均匀混合和会聚，从而提高出射到所述液晶显示面板11的背光光束的均匀度和可视角度内亮度。
所述背光源140包括发光单元141。所述发光单元141可设置在一个电路板142上。所述发光单元142可以为发光二极管(LED)，所述发光单元142能够用于背光光束。所述背光光束可以为可见光，如白光，或单色光等。在一些实施例中，所述背光光束还可以是不可 见光。
例如，本实施例的一个变更实施例中，所述下扩散片131能够将一部分进入所述下扩散片131的光束的波长改变后透过所述下扩散片131和允许一部分进入所述下扩散片131的光束直接透过。例如：所述扩散片131能够将较短波长的背光光束变为具有不同的较长波长的背光光束。此时，所述背光源140能够发射蓝色光的背光光束并通过所述导光板120进入所述下扩散片131，其中一部分蓝色光被所述下扩散片131能转换为绿色光和红色光，另一部分蓝色光能够和所述绿色光、红色光混合成白色光。所述下增光片132、上扩散片133和上增光片134能够使得透过下扩散片131的不同波长的背光光束进一步均匀混合、会聚后形成白色光，并提供给液晶显示面板11作为显示照明。
本申请其他实施例中，所述下扩散片131可以为量子点膜，其具有改变光束波长和发散光路的光学特性，例如可以将入射的蓝色光的一部分波长变长，转换为红色光和绿色光。所述量子点膜对红外光的透过率不小于50％。
需要说明的是，本说明书中提及的背光光束，可以表示所述背光模组10内的背光源140发射的光束以及所述背光源140发射的经过所述下扩散片131改变波长的光束，还可以表示不同波长的背光光束混合后形成的白色光。所有这些背光光束的作用都是为了给所述液晶显示面板11提供显示所需的照明光束。
请参阅图3，是图1所示实施例的反射片110的透过率曲线示意图，所述反射片110对波长范围900nm～1000nm之间的红外光具有80％以上透过率。
请参阅图4，是图1所示实施例的部分结构示意图。所述反射片 110能够用于透过所述检测光束(下面提及“检测光束”时，其表示所述第一检测光束101和/或第二检测光束102)。所述反射片110能够用于反射背光光束103。其中，背光源140发射的背光光束103通过导光板120的一个侧面(即入光面)进入导光板120，其中部分背光光束103通过所述导光板120的底面出射并到达所述反射片110。所述反射片110可以采用多层光学膜片叠加或贴合在一起形成，通过可包括几十至几百层光学膜片。每层光学膜片对所述背光光束103和检测光束(包括第一检测光束101和/或第二检测光束102)具有不完全相同的折射率，通过不断叠加、配置不同光学特性的多个光学膜片，使得背光光束103在多个光学膜片之间不断折射和反射，而检测光束能够透过多个光学膜片，从而实现所述反射片110能够透过所述检测光束并反射所述背光光束103。本实施例中，所述检测光束(第一检测光束101和/或第二检测光束102)为红外光，例如波长为800nm～1000nm的红外光；所述背光光束103为可见光。
请参阅图5，示意了图1所示实施例的反射片110在一个变更实施例中的部分结构示意图，所述反射片110包括光学基板111和设置在所述光学基板111中的多个微结构112。所述微结构112能够用于反射背光光束103并透射检测光束(包括第一检测光束101和/或第二检测光束102)。所述微结构112可以为具有和所述背光光束103波长或波长范围相同或接近的直径大小的微孔结构，且所述微孔结构直径小于所述检测光束波长。
所述光学基板111可选的为聚乙烯(polyethylene，PE)材料，或聚对苯二甲酸乙二酯(Polyethylene terephthalate，PET)材料或其他类似具有良好光学透明性的材料制成。所述微结构112例如但不限于，对800nm以上波长的光束具有较高的透过率(80％以上)，对 780nm以下波长的光束具有极高的反射率(90％以上)。所述微结构112相互连接(interconnected)的均匀分布在所述光学基板111中。
本实施例中，所述检测光束101、102为波长800nm以上的光束，例如可以为波长范围800～1000nm之间的红外光。所述背光光束103为波长780nm以下的光束，例如所述背光光束103为可见光。所述微结构112是直径大小为50nm～1000nm之间的纳米微孔(nanopore)，或者所述微结构112的直径大小为400nm～700nm之间。波长为380nm～780nm之间的可见光通过所述多个微结构112时，由于所述微结构112的直径大小和可见光波长相近，因此可见光(如本实施例中的背光光束103)入射到所述微结构112上发散反射(scatter)。又由于所述微结构112的微孔直径小于红外光(800nm以上波长)波长，所以红外光的第一检测光束101和/或第二检测光束102可以透过而没有影响。
因此，本实施例中，所述背光源140发射包括可见光的背光光束103通过所述导光板120的一个侧面(即所述导光板120的入光面)进入导光板120，并可从所述导光板120的底面出射后进入所述反射片110并被所述反射片110反射后进入所述导光板120。所述实施例中的变更实施例中，所述反射片110较佳的为纳米多孔膜(nanoporous PE)，其厚度为1μm～20μm(微米)。图5所示微结构112仅为示意性表示，不代表具体结构和位置关系的限定。
本实施例、上述其他实施例或变更实施例中，所述发射单元21、接收单元22可以设置在所述反射片110下方，第一检测光束101和第二检测光束102分别透过所述反射片110。
本实施例、上述其他实施例或变更实施例中，所述发射单元21可以不设置在所述反射片110下方、接收单元22可以设置在所述反射 片110下方，第一检测光束101不需要透过所述反射片110并直接到达外部对象上，被外部对象反射的第二检测光束102透过所述反射片110接收被所述接收单元22接收。例如，所述发射单元21可以设置在所述反射片110上方的背光模组10中；或者所述发射单元21可设置在所述背光模组10上方，位于所述背光模组10和液晶显示面板11之间；或者所述发射单元21设置在所述背光模组10和液晶显示面板11之外的侧方。
本实施例、上述其他实施例或变更实施例中，所述生物特征检测模组2设置的位置对应所述液晶显示面板11底部中间，或者所述生物特征检测模组2还可以具有不同位置设置，本申请不作限制。
请参阅图6，图1所示电子装置的一个变更实施例中，所述发射单元21设置在所述液晶显示面板21顶部的部分水滴状非显示区域内(这种显示面板通常俗称为“水滴屏”或“美人尖”)。所述发射单元位于一个玻璃盖板(图未示)下方，所述玻璃盖板覆盖所述液晶显示面板11和所述发射单元21。所述接收单元22设置在所述背光模组10下方。此时，所述电子装置能够用于脸部检测和识别。
请参阅图7，图1所示电子装置的一个变更实施例中，所述发射单元21和接收单元22都设置在背光模组10下方，此时所述电子装置能够用于指纹或脸部检测和识别。
本实施例、上述其他实施例或变更实施例中，所述液晶显示面板11可包括相对设置的两基板，设置在所述二基板之间的液晶层，设置在基板上的多个薄膜晶体管(Thin Film Transistor，TFT)，多个栅极线，多个数据线，多个像素电极，彩色滤光膜等，及其形成的呈阵列分布的多个像素单元，以及数据驱动电路，时序控制电路，电源电路等。
本申请上述或变更实施例中，所述反射片110还可以通过在其中参杂对可见光高散射对红外光高透过的颗粒实现；或者所述反射片110还可以通过在其上表面或下面覆盖对可见光高散射对红外光高透过的颗粒实现；或者所述反射片110还可以通过在其上表面或下表面进行化学蚀刻或机械打磨加工形成对可见光高散射对红外光高透过的微表面结构。这里所述的高透过指的是透过率大于80％，高反射指的是反射率大于90％。所述反射片110还可以包括如上述实施例中所述的光学基板111。
本申请上述或变更实施例中，所述光学基板111可以为透明材料制成，也可以为不透明材料制成。
本申请上述或变更实施例中，所述反射片110下表面设有增透膜，能够进一步提高所述反射片110对红外光的检测光束的透过率。
本申请上述或变更实施例中，电子装置可以是手机，平板电脑，智能手表，增强现实/虚拟现实装置，人体动作检测装置，自动驾驶汽车，智能家居设备，安防设备，智能机器人或其他具有能够用于对象生物特征检测和识别的电子装置。
相较于现有技术，本申请电子装置、背光模组和生物特征检测模组通过采用对检测光束具有良好透过率和对背光光束极高反射率的背光模组，从而不需要在背光模组上打孔便能实现屏下的生物特征检测和识别，具有较好的整体视觉效果和用户体验，屏下生物特征检测体验较好，也从一方面减少了工艺成本。
可变更地，在某些实施方式中，所述液晶显示面板11也可被替换为其它合适类型的显示面板，例如电子纸显示面板。
需要说明的是，本领域技术人员可以理解，在不付出创造性劳动的前提下，本申请实施例的部分或全部，以及对于实施例的部分 或全部的变形、替换、变更、拆分、组合、扩展等均应认为被本实用新型的实用新型创造思想所涵盖，属于本实用新型的保护范围。
在本说明书中对于“一个实施例”、“实施例”、“示例实施例”等的任何引用表示结合该实施例描述的特定特征、结构或特性被包括在本申请的至少一个实施例中。在本说明书中不同位置出现的这种短语并不一定全部指相同的实施例。另外，当结合任何实施例描述特定的特征或结构时，所主张的是，结合这些实施例的其它实施例来实现这种特征或结构在本领域技术人员的技术范围内。
本申请说明书中可能出现的“长度”、“宽度”、“上”、“下”、“前”、“后”、“背面”、“正面”、“竖直”、“水平”、“顶部”、“底部”、“内部”、“外部”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。相似的标号和字母在附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。同时，在本申请的描述中，术语“第一”、“第二”等仅用于区分描述，而不能理解为指示或暗示相对重要性。在本申请的描述中，“多种”或“多个”的含义是至少两种或两个，除非另有明确具体的限定。本申请的描述中，还需要说明的是，除非另有明确的规定和限定，“设置”、“安装”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接连接，也可以是通过中间媒介间接连接，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。权利要求书中所使用的术语不应理解为将申请限制于本说明书中所公开的特定实施例。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (21)

  1. 一种背光模组，其特征在于，用于透过由外部对象发射和/或反射的检测光束至一生物特征检测模组，所述检测光束用于外部对象的生物特征信息的检测和识别，所述背光模组能够给一个显示面板提供背光光束，所述背光模组包括能够透过所述检测光束且反射所述背光光束的反射片。
  2. 根据权利要求1所述的背光模组，其特征在于，所述生物特征检测模组至少部分设置在所述反射片下方，所述反射片是由多层对所述检测光束和背光光束的折射率不完全相同的光学膜片叠加或贴合构成，或者，所述反射片为纳米多孔膜。
  3. 根据权利要求1所述的背光模组，其特征在于，所述反射片包括光学基板和设置在所述光学基板中的多个相互连接且均匀分布的微结构，所述微结构为具有和所述背光光束波长或波长范围相同或接近的直径大小的微孔结构，且所述微孔结构直径小于所述检测光束波长。
  4. 根据权利要求3所述的背光模组，其特征在于，所述微结构对800nm以上波长的光束具有80％以上的透过率，对780nm以下波长的光束具有90％以上反射率。
  5. 根据权利要求4所述的背光模组，其特征在于，所述检测光束为波长范围800～1000nm之间的红外光，所述背光光束为波长780nm以下的可见光。
  6. 根据权利要求4所述的背光模组，其特征在于，所述微结构的直径大小为400nm～700nm之间。
  7. 根据权利要求1所述的背光模组，其特征在于，所述反射片在其中参杂对背光光束高散射对检测光束高透过的颗粒；或者所述反射片在其上表面或下面覆盖对背光光束高散射对检测光束高透过 的颗粒；或者所述反射片还可以通过在其上表面或下表面进行化学蚀刻或机械打磨加工形成对背光光束高散射对检测光束高透过的微表面结构。
  8. 根据权利要求1-7中任一所述的背光模组，其特征在于，所述背光模组还包括依次设置在所述反射片上的导光板和光学片、以及设置在所述导光板一侧的背光源，所述背光源用于发射背光光束，所述反射片用于将背光源发射的背光光束反射到导光板并允许所述检测光束直接透过，所述导光板包括一个和光学片邻近的出光面，所述导光板用于使得从其侧面进入的背光光束从所述出光面出射并进入所述光学片。
  9. 根据权利要求8所述的背光模组，其特征在于，所述光学片包括扩散片，所述扩散片为量子点膜。
  10. 根据权利要求9所述的背光模组，其特征在于，所述背光源用于发射蓝色光的背光光束并通过所述导光板进入所述扩散片，其中一部分蓝色光被所述扩散片转换为绿色光和红色光，另一部分蓝色光和所述绿色光、红色光混合成白色光后发散射出。
  11. 根据权利要求10所述的背光模组，其特征在于，所述检测光束为红外光或近红外光，所述扩散片对所述背光光束的扩散作用大于对所述检测光束的扩散作用。
  12. 根据权利要求1-7中任一所述的背光模组，其特征在于，所述背光模组还包括增透膜，所述增透膜设置在所述反射片的下表面，用于提高所述反射片对所述检测光束的透过率。
  13. 根据权利要求1所述的背光模组，其特征在于，所述检测光束为红外光或近红外光，所述背光光束为可见光。
  14. 根据权利要求1所述的背光模组，其特征在于，所述生物特 征检测模组至少部分地设置在所述背光模组下方，所述生物特征检测模块能够透过所述背光模组发射检测光束到外部对象上，或直接发射检测光束到外部对象上。
  15. 根据权利要求1所述的背光模组，其特征在于，所述生物特征检测模组包括发射单元和接收单元，所述接收单元能够透过所述背光模组接收外部对象反射的来自所述发射单元的检测光束，所述发射单元设置在所述反射片下方、或侧方或集成在所述背光模组中，所述发射单元用于发射所述检测光束到外部对象上。
  16. 根据权利要求1所述的背光模组，其特征在于，所述生物特征检测模组包括发射单元和接收单元，进行生物特征检测时，所述发射单元发射的检测光束通过所述背光模组和一个显示面板出射到外部，或所述发射单元发射的检测光束直接通过该显示面板出射到外部，或所述发射单元发射的检测光束直接出射到外部；所述检测光束出射到外部并被外部对象反射后能够经过所述显示面板和背光模组到达所述接收单元，所述生物特征检测模组能够根据接收到的检测光束采集外部对象的二维或三维的生物特征信息从而实现生物特征检测和识别。
  17. 根据权利要求1所述的背光模组，其特征在于，所述检测光束被所述生物特征检测模组或其他光源发射至外部对象上或所述检测光束是外部对象发射。
  18. 一种显示器，其特征在于，包括如权利要求1-17中任一所述的背光模组和显示面板，所述背光模组用于提供背光光束至显示面板，以实现图像显示。
  19. 一种生物特征检测模组，其特征在于，能够透过如权利要求1～17任一所述的背光模组接收用于生物特征检测和识别的检测光 束。
  20. 根据权利要求19所述的生物特征检测模组，其特征在于，所述生物特征检测模组根据接收到的检测光束执行指纹识别或/和三维面部识别或/和活体检测。
  21. 一种电子装置，其特征在于，包括显示器和设置在所述显示器下方的生物特征检测模组，所述显示器包括背光模组和显示面板，所述背光模组设置在所述显示面板下方，所述生物特征检测模组至少部分设置在所述背光模组下方，所述生物特征检测模组能够透过所述显示面板的显示区域和背光模组接收用于生物特征检测和识别的检测光束，其中，所述背光模组为权利要求1-17任一所述的背光模组。
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