CN210402370U - Biological characteristic detection module, backlight module and electronic device - Google Patents

Abstract

The utility model discloses a biological characteristic detects module, biological characteristic detects module can see through a backlight unit and receives the testing beam of outside object transmission and/or reflection, testing beam quilt biological characteristic detects module or other light source transmission to outside object on, or testing beam is the transmission of outside object, testing beam is used for the detection and the discernment of the biological characteristic information of outside object, backlight unit is used for providing backlight for a display panel, backlight unit is including can seeing through testing beam and reflection backlight beam's reflector plate. The utility model also discloses a backlight unit and electron device. The utility model discloses biological characteristic detection module and backlight unit and electron device have better biological characteristic detection effect under the screen.

Description

Biological characteristic detection module, backlight module and electronic device

Technical Field

The utility model relates to the field of photoelectric technology, especially, relate to a biological characteristic detects module and backlight unit and electron device.

Background

With the technical progress and the improvement of living standard of people, users demand more functions and fashionable appearance for electronic products such as mobile phones, tablet computers, cameras and the like. At present, the development trend of mobile phones is that the mobile phones are light and thin, are close to a full screen, and have functions of self-shooting by a front camera, face recognition and the like. As the functions supported by the electronic device become more and more abundant, the number of elements to be set becomes more and more, and a part of the display area on the front side of the electronic device needs to be occupied, which affects the appearance and user experience.

Recently, in order to achieve a full screen or nearly full screen effect, a technology of detecting biological features under a screen has come into use, that is, a biological feature detection module is placed below a display screen, and biological feature detection is achieved by sending or receiving detection light beams through the display screen. However, for non-self-emissive types of display screens, such as liquid crystal display screens, the under-screen biometric detection needs to address the screen's problem with respect to the detection beam transmittance. Some manufacturers have proposed placing the biometric detection module under the backlight module and tapping the entire display screen and backlight module. Although the scheme can realize the detection of the biological features under the screen, the relatively complex process is needed, the product cost is high, the holes are formed in the screen, so that the visual effect and the attractiveness of the whole display of the screen are poor, and the light leakage and the uneven display caused by the holes also cause the poor detection experience and the poor detection effect of the biological features under the screen.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a be used for biological characteristic detection module and backlight unit and electron device under screen for solving prior art problem.

An aspect of the utility model discloses a biological characteristic detection module, biological characteristic detection module can see through a backlight unit and receive the measuring beam of outside object transmission and/or reflection, measuring beam quilt biological characteristic detection module or other light source transmission to outside object on, or measuring beam is the outside object transmission, measuring beam is used for the detection and the discernment of the biological characteristic information of outside object, backlight unit can provide backlight for a display panel, backlight unit is including seeing through measuring beam and reflection backlight beam's reflector plate.

Optionally, the biometric characteristic detection module is at least partially disposed under the reflector, and the reflector is formed by overlapping or attaching multiple layers of optical films with refractive indexes incompletely equal to those of the detection beam and the backlight beam, or the reflector is a nano-porous film.

Optionally, the backlight module further includes a light guide plate and an optical sheet sequentially disposed on the reflector plate, and a backlight source disposed on one side of the light guide plate, the backlight source is configured to emit a backlight beam, the reflector plate is configured to reflect the backlight beam emitted by the backlight source to the light guide plate and allow the detection beam to directly penetrate through the light guide plate, the light guide plate includes a light exit surface adjacent to the optical sheet, and the light guide plate is configured to enable the backlight beam entering from a side surface of the light guide plate to exit from the light exit surface and enter the optical sheet.

Optionally, the reflector includes an optical substrate and a plurality of microstructures disposed in the optical substrate and connected to each other and distributed uniformly, each of the microstructures is a micro-porous structure having a diameter equal to or close to the wavelength or wavelength range of the backlight beam, and the diameter of the micro-porous structure is smaller than the wavelength of the detection beam.

Optionally, the microstructure has a transmittance of 80% or more for light beams with a wavelength of 800nm or more and a reflectance of 90% or more for light beams with a wavelength of 780nm or less, the detection light beam is infrared light with a wavelength range of 800-1000 nm, the backlight light beam is visible light with a wavelength of 780nm or less, and the diameter of the microstructure is 400 nm-700 nm.

Optionally, the reflective sheet is doped with particles which are highly scattered for visible light and highly transparent for infrared light; or the reflecting sheet is covered with particles which are highly scattered to visible light and highly transmitted to infrared light on the upper surface or the lower surface; or the reflector plate can also be processed by chemical etching or mechanical polishing on the upper surface or the lower surface to form a micro-surface structure which has high scattering of visible light and high transmission of infrared light.

Optionally, the biometric detection module is at least partially disposed below the backlight module, and the biometric detection module can transmit the detection beam to the external object through the backlight module, or directly transmit the detection beam to the external object.

Optionally, the biometric detection module includes an emitting unit and a receiving unit, the receiving unit can receive the detection light beam from the emitting unit reflected by the external object through the backlight module, the emitting unit is disposed below, or beside, or integrated in the backlight module, and the emitting unit is configured to emit the detection light beam to the external object.

Optionally, the biometric detection module includes a transmitting unit and a receiving unit, and when biometric detection is performed, the detection light beam transmitted by the transmitting unit is emitted to the outside through the backlight module and a display panel, or the detection light beam transmitted by the transmitting unit is directly emitted to the outside through the display panel, or the detection light beam transmitted by the transmitting unit is directly emitted to the outside; the detection light beam is emitted to the outside and can reach the receiving unit through the display panel and the backlight module after being reflected by an external object, and the biological characteristic detection module can collect two-dimensional or three-dimensional biological characteristic information of the external object according to the received detection light beam so as to realize biological characteristic detection and identification.

An aspect of the utility model discloses a backlight unit, it can be used for foretell biological characteristic to detect the module and see through this backlight unit and receive the measuring beam who is used for biological characteristic to detect and discern, backlight unit can provide backlight beam for a display panel, backlight unit is including can seeing through measuring beam and reflection backlight beam's reflector plate, biological characteristic detects and discerns fingerprint detection and discernment.

An aspect of the utility model discloses an electronic device, be in including display and setting the biological feature detection module assembly of display below, the display includes backlight unit and display panel, backlight unit sets up the display panel below, biological feature detection module assembly part at least sets up the backlight unit below, biological feature detection module assembly is foretell biological feature detection module assembly, electronic device is used for fingerprint detection and discernment. Compared with the prior art, the utility model discloses electron device, backlight unit and biological characteristic detect module have good transmissivity and to the backlight unit of the high reflectivity of backlight beam through adopting to detecting light beam to need punch on backlight unit just can realize the biological characteristic under the screen and detect and discern, have better whole visual effect and user experience, make the utility model discloses biological characteristic detect effect is better under the screen, has also reduced the processing cost from the one side.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic view, partially in cross-section, of the embodiment shown in FIG. 1;

FIG. 3 is a graph showing transmittance curves of the reflector sheet of the embodiment shown in FIG. 1;

FIG. 4 is a schematic diagram of a portion of the structure of the embodiment shown in FIG. 1;

FIG. 5 is a schematic diagram of a portion of the structure of the embodiment shown in FIG. 1;

fig. 6 is a schematic view of an embodiment of the present invention;

fig. 7 is a schematic diagram of an embodiment of the present invention.

Detailed Description

In the detailed description of the embodiments of the present invention, it is to be understood that when a substrate, a frame, a sheet, a layer, or a pattern is referred to as being "on" or "under" another substrate, another sheet, another layer, or another pattern, it can be "directly" or "indirectly" on the other substrate, the other sheet, the other layer, or the other pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented for clarity. Further, the sizes of the elements in the drawings do not completely reflect actual sizes.

An embodiment of the utility model provides a biological characteristic detection module assembly, biological characteristic detection module assembly can see through a backlight unit and receive the measuring beam of outside object transmission and/or reflection, measuring beam quilt biological characteristic detection module assembly or other light source transmission to outside object on, or measuring beam is the outside object transmission, measuring beam is used for the detection and the discernment of the biological characteristic information of outside object, backlight unit can provide backlight for a display panel, backlight unit is including can seeing through measuring beam and reflection backlight beam's reflector plate.

The biological characteristic detection module is at least partially arranged below the reflector plate, and the reflector plate is formed by overlapping or attaching a plurality of layers of optical films with incompletely same refractive indexes of the detection light beam and the backlight light beam.

The backlight module also comprises a light guide plate and an optical sheet which are sequentially arranged on the reflector plate, and a backlight source arranged on one side of the light guide plate, wherein the backlight source is used for emitting backlight beams, the reflector plate is used for reflecting the backlight beams emitted by the backlight source to the light guide plate and allowing the detection beams to directly penetrate through, the light guide plate comprises a light emergent surface adjacent to the optical sheet, and the light guide plate is used for enabling the backlight beams entering from the side surface of the light guide plate to be emitted from the light emergent surface and enter the optical sheet.

The reflector comprises an optical substrate and a plurality of microstructures which are arranged in the optical substrate, are connected with each other and are uniformly distributed, the microstructures are microporous structures with the diameter size which is the same as or close to the wavelength or the wavelength range of the backlight beam, and the diameter of each microporous structure is smaller than the wavelength of the detection beam.

The biological characteristic detection module is at least partially arranged below the backlight module, and the biological characteristic detection module can transmit a detection light beam to an external object through the backlight module or directly transmit the detection light beam to the external object.

The biological characteristic detection module comprises an emitting unit and a receiving unit, the receiving unit can receive a detection light beam reflected by an external object from the emitting unit through the backlight module, the emitting unit is arranged below the reflector plate or on the side or integrated in the backlight module, and the emitting unit is used for emitting the detection light beam to the external object.

The biological characteristic detection module comprises a transmitting unit and a receiving unit, and when biological characteristic detection is carried out, the detection light beam transmitted by the transmitting unit is emitted to the outside through the backlight module and a display panel, or the detection light beam transmitted by the transmitting unit is directly emitted to the outside through the display panel, or the detection light beam transmitted by the transmitting unit is directly emitted to the outside; the detection light beam is emitted to the outside and can reach the receiving unit through the display panel and the backlight module after being reflected by an external object, and the biological characteristic detection module can collect two-dimensional or three-dimensional biological characteristic information of the external object according to the received detection light beam so as to realize biological characteristic detection and identification.

The utility model discloses other embodiments still provide a backlight unit, can be used for as above-mentioned arbitrary biological characteristic detection module see through this backlight unit and receive the measuring beam that is used for biological characteristic to detect and discern, backlight unit can provide backlight for a display panel, backlight unit is including can seeing through measuring beam and reflection backlight beam's reflector plate.

The utility model discloses other embodiments still provide an electron device including above-mentioned biological characteristic detection module assembly, be in including display and setting the biological characteristic detection module assembly of display below, the display includes backlight unit and display panel, backlight unit sets up the display panel below, biological characteristic detection module assembly part at least sets up the backlight unit below, biological characteristic detection module assembly is foretell biological characteristic detection module assembly.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 and 2, in an embodiment of the present invention, an electronic device includes a liquid crystal display 1 and a biometric feature detection module 2 disposed below the liquid crystal display 1. The liquid crystal display 1 comprises a backlight module 10 and a liquid crystal display panel 11, wherein the backlight module 10 is arranged below 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 disposed under the backlight module 10. The biometric characteristic 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 biometric detection module 2 can receive a 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 characteristic detection module or other light sources, or the detection light beam is emitted by the external object and can be used for biological characteristic detection and identification of the external object.

The biometric detection module 2 comprises 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, and the transmitting unit 21 and the receiving unit 22 are only schematically shown in fig. 1 and do not represent any limitation of the shape, structure and positional relationship between the transmitting unit 21 and the receiving unit 22.

In the embodiment and the modified embodiment of the present invention, the receiving unit 22 may be disposed below the backlight module 10; the emitting unit 21 is disposed below the backlight module 10, or disposed at a side of the backlight module, or integrated in the backlight module 10, or disposed above the backlight module 10. For example, but not limited to, the emitting unit 21 and the backlight module 10 are disposed at a distance from or closely beside the backlight module 10. The side direction includes, but is not limited to, a side direction, or a side direction, where the side direction is understood to mean that at least one projection exists on the liquid crystal display panel 11, and at least a part of the projection and the backlight module do not overlap in the projection direction.

In the embodiment and the modified embodiment of the present invention, the detection light beam emitted by the emitting unit 21 can be reflected by an external object (for example, a finger or a face) and then received by the receiving unit 22 through the backlight module 10.

In a further embodiment, when the biometric feature detection module 2 is used for fingerprint detection and identification, the transmitting unit 21 and the receiving unit 22 are both disposed below the backlight module 10.

In a further embodiment, when the biometric feature detection module 2 is used for face detection and recognition, the transmitting unit 21 is disposed on the side or above the backlight module, or the transmitting unit is integrated in the backlight module; the receiving unit 22 is disposed under the backlight module 10.

The biometric detection module 2 is capable of emitting and/or receiving a detection light beam through the backlight module 10. The emitting unit 21 can emit a detection beam to an external object through the backlight module 10 or not emit a detection beam to an external object through the backlight module 10, and the receiving unit 22 can receive the detection beam reflected by the external object through the backlight module 10. The receiving unit 22 is also capable of receiving 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 light beam is greater than the diffusion effect on the detection light beam. The detection beam can be used for detection and identification of biometric information of an external object.

For convenience of description and clarity of understanding, 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 a second detection light beam 102, and the second detection light beam 102 can include a light beam that is transmitted through the liquid crystal display 1 to the receiving unit 22. For example: the second detection beam 102 may include the first detection beam 101, which reaches the receiving unit 22 after passing through the liquid crystal display panel 11 and the backlight module 10 in the reflected light reflected by the external object. In this case, the second detection beam 102 is substantially a reflected beam of the first detection beam 101 on an external object. The biometric detection module 2 can obtain two-dimensional and/or three-dimensional image information or biometric information of an external object by the emitting unit 21 emitting the first detection light beam 101 and the receiving unit 22 receiving the second detection light beam 102. The external object may be a finger, a face, an iris or other object with recognizable biometric features of the user.

Furthermore, the second detection beam 102 may also comprise other beams emitted and/or reflected by external objects instead of the reflected beam of the first detection beam 101. For example, the second detection light beam 102 may further include visible light emitted and/or reflected by the external object, and the receiving unit 22 may further be capable of receiving the second detection light beam 102 of the visible light reflected by the external object so as to obtain visible light image information of the external object; or the second detection beam 102 may also comprise infrared light emitted and/or reflected by the external subject, such as radiated infrared light emitted by a biological object, thereby enabling detection of biological signs of the external subject, such as temperature, distance, heartbeat, posture, etc.

The biometric detection module 2 can obtain two-dimensional image information or biometric information of the external object through the second light beam 102 reflected or emitted by the external object. The biometric detection module 2 may further comprise a processor (not shown) capable of calculating the displacement 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 stores the biological feature information data in advance, and the processor can realize the biological feature detection and identification of the external object by comparing the obtained two-dimensional information and/or depth information of the external object with the biological feature information data stored in advance, such as but not limited to: fingerprint recognition, face recognition, iris recognition, and the like.

By detecting and identifying the biological characteristics of the external object, the biological characteristic detection module 2 can be applied to various products and application scenes such as locking or unlocking of an electronic device (such as a mobile phone), online payment service verification, identity verification of a financial system or a public security system, passage verification of an access control system and the like.

As shown in fig. 1 and 2, the backlight module 10 includes a reflective sheet 110, a light guide plate 120 disposed on the reflective sheet, a backlight 140 disposed on one side of the light guide plate, and an optical sheet 130 disposed on the light guide plate 120. The backlight 150 is used for emitting a backlight beam, and the light guide plate 120 guides the backlight beam into the optical sheet 130, and specifically, the backlight beam enters the optical sheet 130 from an exit surface of the light guide plate 120 (a surface of the light guide plate 120 adjacent to the lower diffusion sheet 131 in fig. 2). The reflective sheet 110 can be used to reflect the backlight beam emitted from the backlight source 140 and emitted from the bottom surface of the light guide plate 12 back to the light guide plate 120 and allow the detection beams (the first detection beam 101 and the second detection beam 102) to directly transmit 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 enable the backlight beam entering from the side surface thereof to exit from the light exit surface and enter the optical sheet 130. The reflective sheet 110 and the biometric detection module 2 are disposed closely or at intervals, and the biometric detection module 2 is disposed at least partially under the reflective sheet 1110.

In the embodiments and variations, the optical sheet 130 may include one or more Diffusion sheets (DF), or one or more Brightness Enhancement Films (BEF), or a combination of the Diffusion sheets and the Brightness Enhancement films. For example, the optical sheet 130 may include a lower diffusion sheet, a lower brightness enhancement sheet and an upper brightness enhancement sheet sequentially arranged from bottom to top; or the optical sheet 130 includes a lower diffusion sheet, a lower brightness enhancement sheet, an upper diffusion sheet and an upper brightness enhancement sheet, which are sequentially disposed from bottom to top. The structure and composition of the optical sheet 130 are merely schematically illustrated in the present specification and the drawings, and are not limited thereto.

In this embodiment, 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 disposed from bottom to top. The lower diffusion sheet 131 is disposed in close contact with the light guide plate 120. The lower and upper diffusion sheets 131 and 133 can be used to diffuse the backlight beam, and the lower and upper brightness enhancement sheets 132 and 134 can be used to converge the backlight beam and enhance the brightness of the beam within a viewing angle.

Therefore, the optical sheets 130 can uniformly mix and condense the backlight beam from the light guide plate 120, thereby improving uniformity and brightness within a viewing angle of the backlight beam exiting to the liquid crystal display panel 11.

The backlight 140 includes a light emitting unit 141. The light emitting unit 141 may be disposed on one 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, etc. In some embodiments, the backlight beam may also be invisible light.

For example, in a modified embodiment of this embodiment, the lower diffusion sheet 131 can change the wavelength of a light beam partially entering the lower diffusion sheet 131 and transmit the light beam through the lower diffusion sheet 131, and allow a part of the light beam partially entering the lower diffusion sheet 131 to directly transmit the light beam. For example: the diffusion sheet 131 can change a backlight beam of a shorter wavelength into a backlight beam having a different longer wavelength. At this time, the backlight 140 can emit a backlight beam of blue light and enter the lower diffusion sheet 131 through the light guide plate 120, wherein a part of the blue light can be converted into green light and red light by the lower diffusion sheet 131, and another part of the blue light can be mixed with the green light and the red light into white light. The lower brightness enhancement film 132, the upper diffusion film 133 and the upper brightness enhancement film 134 can further uniformly mix and converge the backlight beams with different wavelengths transmitted through the lower diffusion film 131 to form white light, and provide the white light to the liquid crystal display panel 11 as display illumination.

In other embodiments of the present invention, the lower diffusion sheet 131 may be a quantum dot film having optical characteristics of changing a wavelength of a light beam and diverging a light path, for example, a part of the wavelength of incident blue light may be lengthened and converted into red light and green light. The transmittance of the quantum dot film to infrared light is not less than 50%.

The backlight beam mentioned in this specification may refer to a light beam emitted from the backlight 140 in the backlight module 10, a light beam emitted from the backlight 140 and having a wavelength changed by the lower diffusion sheet 131, or a white light formed by mixing backlight beams having different wavelengths. All of these backlight beams function to provide the liquid crystal display panel 11 with illumination light beams necessary for display.

Referring to fig. 3, which is a schematic diagram of a transmittance curve of the reflective sheet 110 in the embodiment shown in fig. 1, the reflective sheet 110 has a transmittance of more than 80% for infrared light with a wavelength range of 900nm to 1000 nm.

Please refer to fig. 4, which is a partial structural diagram of the embodiment shown in fig. 1. The reflective sheet 110 can be used to transmit the detection beam (which means the first detection beam 101 and/or the second detection beam 102 when referring to "detection beam" below). The reflective sheet 110 can be used to reflect the backlight beam 103. The backlight beam 103 emitted from the backlight source 140 enters the light guide plate 120 through one side surface (i.e., the light incident surface) of the light guide plate 120, and a 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 attaching a plurality of optical films, and may include several tens to several hundreds of optical films. Each layer of optical film has an incomplete same refractive index for the backlight beam 103 and the detection beam (including the first detection beam 101 and/or the second detection beam 102), and the backlight beam 103 is continuously refracted and reflected among the optical films by continuously overlapping and configuring a plurality of optical films with different optical characteristics, while the detection beam can penetrate through the optical films, so that the reflector 110 can penetrate through the detection beam and reflect the backlight beam 103. In this embodiment, the detection light beam (the first detection light beam 101 and/or the second detection light beam 102) is infrared light, for example, infrared light with a wavelength of 800nm to 1000 nm; the backlight beam 103 is visible light.

Referring to fig. 5, which illustrates a partial structural schematic view of the reflective sheet 110 in a modified embodiment of the embodiment shown in fig. 1, the reflective sheet 110 includes an optical substrate 111 and a plurality of microstructures 112 disposed in the optical substrate 111. The microstructures 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 microstructures 112 may be micro-porous structures having a diameter that is the same or close to the wavelength or wavelength range of the backlight beam 103, and the diameter of the micro-porous structures is smaller than the wavelength of the detection beam.

The optical substrate 111 may be made of Polyethylene (PE) material, or Polyethylene terephthalate (PET) material, or other similar materials with good optical transparency. The microstructure 112 has, for example, but not limited to, a high transmittance (80% or more) for a light beam having a wavelength of 800nm or more and an extremely high reflectance (90% or more) for a light beam having a wavelength of 780nm or less. The microstructures 112 are connected (interconnected) uniformly distributed in the optical substrate 111.

In this embodiment, the detection beams 101 and 102 are beams with a wavelength of 800nm or more, such as infrared light with a wavelength range of 800-1000 nm. The backlight light beam 103 is a light beam with a wavelength below 780nm, for example, the backlight light beam 103 is visible light. The micro-structure 112 is a nano-pore (nanopore) with a diameter of 50nm to 1000nm, or the micro-structure 112 has a diameter of 400nm to 700 nm. When visible light with a wavelength of 380nm to 780nm passes through the plurality of microstructures 112, the diameter of the microstructures 112 is similar to the wavelength of the visible light, so that the visible light (such as the backlight beam 103 in this embodiment) is incident on the microstructures 112 to be divergently reflected (scatter). Since the diameter of the micro-holes of the micro-structures 112 is smaller than the wavelength of infrared light (above 800 nm), the first detection beam 101 and/or the second detection beam 102 of infrared light can be transmitted without influence.

Therefore, in this embodiment, the backlight source 140 emits a backlight beam 103 including visible light, which enters the light guide plate 120 through one side surface of the light guide plate 120 (i.e., the light incident surface of the light guide plate 120), and can exit from the bottom surface of the light guide plate 120, enter the reflective sheet 110, be reflected by the reflective sheet 110, and enter the light guide plate 120. In a variation of the above embodiment, the reflective sheet 110 is preferably a nanoporous film (nanoporous PE) having a thickness of 1 μm to 20 μm (micrometers). The microstructures 112 shown in fig. 5 are schematic representations only, and do not represent limitations to specific structures and positional relationships.

In this embodiment, the other embodiments or the modified embodiments, the emitting unit 21 and the receiving unit 22 may be disposed below the reflective sheet 110, and the first detection beam 101 and the second detection beam 102 respectively transmit through the reflective sheet 110.

In this embodiment, the other embodiments or the modified embodiments, the emitting unit 21 may not be disposed below the reflective sheet 110, the receiving unit 22 may be disposed below the reflective sheet 110, the first detection beam 101 does not need to transmit through the reflective sheet 110 and directly reaches the external object, and the second detection beam 102 reflected by the external object is received through the reflective sheet 110 and received by the receiving unit 22. For example, the emission unit 21 may be disposed in the backlight assembly 10 above the reflective sheet 110; or the emitting unit 21 may be disposed above the backlight module 10 and between the backlight module 10 and the liquid crystal display panel 11; or the emitting unit 21 is arranged at the side outside the backlight module 10 and the liquid crystal display panel 11.

In this embodiment, the above other embodiments or modified embodiments, the position of the biometric feature detection module 2 corresponds to the middle of the bottom of the liquid crystal display panel 11, or the biometric feature detection module 2 may further have different position settings, which is not limited by the present invention.

Referring to fig. 6, in a modified embodiment of the electronic device shown in fig. 1, the emitting unit 21 is disposed in a part of the droplet-shaped non-display region on the top of the liquid crystal display panel 21 (such a display panel is commonly referred to as a "water droplet screen" or "beauty tip"). The emission unit is located under a glass cover plate (not shown) that covers the liquid crystal display panel 11 and the emission unit 21. The receiving unit 22 is disposed under the backlight module 10. At this time, the electronic device can be used for face detection and recognition.

Referring to fig. 7, in a modified embodiment of the electronic device shown in fig. 1, the transmitting unit 21 and the receiving unit 22 are both disposed below the backlight module 10, and the electronic device can be used for fingerprint or face detection and identification.

In this embodiment, the other embodiments or the modified embodiments, the liquid crystal display panel 11 may include two substrates disposed opposite to each other, a liquid crystal layer disposed between the two substrates, a plurality of Thin Film Transistors (TFTs) disposed on the substrates, a plurality of gate lines, a plurality of data lines, a plurality of pixel electrodes, a color filter, and the like, and a plurality of pixel units formed in an array, and a data driving circuit, a timing control circuit, a power supply circuit, and the like.

In the above or modified embodiment of the present invention, the reflective sheet 110 may be further implemented by doping particles that are highly transparent to visible light and highly scattering to infrared light; or the reflective sheet 110 may be further implemented by covering particles highly scattering visible light and highly transmitting infrared light on the upper surface or the lower surface thereof; or the reflective sheet 110 may be formed with a micro-surface structure that is highly scattering for visible light and highly transmitting for infrared light by performing chemical etching or mechanical polishing on the upper surface or the lower surface thereof. As used herein, high transmission means a transmission greater than 80% and high reflection means a reflection greater than 90%. The reflective sheet 110 may further include an optical substrate 111 as described in the above embodiments.

In the above or modified embodiment of the present invention, the optical substrate 111 may be made of a transparent material, or may be made of an opaque material. In the above or modified embodiment of the present invention, the lower surface of the reflection sheet 110 is provided with an antireflection film, which can further improve the transmittance of the reflection sheet 110 to the detection beam of the infrared light.

The utility model discloses above-mentioned or in the change embodiment, electronic device can be the cell-phone, the panel computer, intelligent wrist-watch, augmented reality/virtual reality device, human action detection device, the autopilot car, intelligent household equipment, security protection equipment, intelligent robot or other have the electronic device that can be used for object biological characteristic to detect and discern.

Compared with the prior art, the utility model discloses electron device, backlight unit and biological characteristic detect module have good transmissivity and to the backlight unit of the high reflectivity of backlight beam through adopting to the measuring beam to need punch on backlight unit just can realize the biological characteristic under the screen and detect and discern, have better whole visual effect and user experience, biological characteristic detects under the screen and experiences betterly, has also reduced process cost from the one side.

Alternatively, in some embodiments, the liquid crystal display panel 11 may be replaced by another suitable type of display panel, such as an electronic paper display panel.

Further, the biometric detection module 2 may also or alternatively be used to sense the proximity or distance of an external object, draw a three-dimensional image of the external object, and so on, for example.

It should be noted that, those skilled in the art can understand that, without creative efforts, some or all of the embodiments of the present invention, and some or all of the deformation, replacement, alteration, split, combination, extension, etc. of the embodiments should be considered as covered by the inventive idea of the present invention, and belong to the protection scope of the present invention.

Any reference in this specification to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature or structure is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature or structure in connection with other ones of the embodiments.

The references to "length", "width", "upper", "lower", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. as used herein are intended to refer to the orientation or positional relationship shown in the drawings, and are intended to facilitate the description of the embodiments and to simplify the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present invention, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted" or "connected" is to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (11)

1. The biological feature detection module is characterized in that the biological feature detection module can receive a detection light beam emitted and/or reflected by an external object through a backlight module and realize sensing of the external object according to the received detection light beam, the backlight module can provide a backlight light beam for a display panel, and the backlight module comprises a reflector plate which can penetrate through the detection light beam and reflect the backlight light beam.

2. The set according to claim 1, wherein the set is at least partially disposed under the reflective sheet, and the reflective sheet is formed by stacking or laminating a plurality of optical films having different refractive indexes with respect to the detection beam and the backlight beam, or the reflective sheet is a nano-porous film.

3. The assembly according to claim 1, wherein the backlight module further comprises a light guide plate and an optical sheet sequentially disposed on the reflector plate, and a backlight source disposed on one side of the light guide plate, the backlight source is configured to emit a backlight beam, the reflector plate is configured to reflect the backlight beam emitted from the backlight source to the light guide plate and allow the detection beam to directly pass through, the light guide plate includes a light exit surface adjacent to the optical sheet, and the light guide plate is configured to enable the backlight beam entering from a side surface of the light guide plate to exit from the light exit surface and enter the optical sheet.

4. The assembly of claim 1, wherein the reflector comprises an optical substrate and a plurality of interconnected and uniformly distributed microstructures disposed on the optical substrate, the microstructures are micro-porous structures having a diameter equal to or close to the wavelength or wavelength range of the backlight beam, and the diameter of the micro-porous structures is smaller than the wavelength of the detection beam.

5. The module according to claim 4, wherein the micro-structure has a transmittance of 80% or more for light beams with a wavelength of 800nm or more and a reflectance of 90% or more for light beams with a wavelength of 780nm or less, the detection light beam is infrared light with a wavelength of 800-1000 nm, the backlight light beam is visible light with a wavelength of 780nm or less, and the diameter of the micro-structure is 400-700 nm.

6. The assembly according to claim 1, wherein the reflective sheet is doped with particles that are highly scattered by the backlight beam and highly transmitted by the detection beam; or the reflecting sheet covers particles which are highly scattered by the backlight beam and highly transmitted by the detection beam on the upper surface or the lower surface of the reflecting sheet; or the reflector plate can also form a micro-surface structure which is highly scattered for the backlight beam and highly transmitted for the detection beam on the upper surface or the lower surface.

7. The biometric detection module of any one of claims 1 to 6, wherein the biometric detection module is disposed at least partially under the backlight module, and the biometric detection module is capable of emitting the detection beam to the external object through the backlight module or directly to the external object.

8. The biometric detection module according to any one of claims 1 to 6, wherein the biometric detection module comprises an emitting unit and a receiving unit, the receiving unit is capable of receiving the detection beam from the emitting unit reflected by the external object through the backlight module, the emitting unit is disposed below the reflective sheet, or beside or integrated in the backlight module, and the emitting unit is used for emitting the detection beam to the external object.

9. The biometric detection module according to any one of claims 1 to 6, wherein the biometric detection module comprises a transmitting unit and a receiving unit, and when biometric detection is performed, the detection beam emitted by the transmitting unit exits to the outside through the backlight module and a display panel, or the detection beam emitted by the transmitting unit exits to the outside directly through the display panel, or the detection beam emitted by the transmitting unit exits to the outside directly; the detection light beam is emitted to the outside and can reach the receiving unit through the display panel and the backlight module after being reflected by an external object, and the biological characteristic detection module can collect two-dimensional or three-dimensional biological characteristic information of the external object according to the received detection light beam so as to realize biological characteristic detection and identification.

10. A backlight module, capable of receiving a detection beam for biometric detection and identification through the backlight module according to any one of claims 1-9, the backlight module being capable of providing a backlight beam to a display panel, the backlight module comprising a reflector plate capable of transmitting the detection beam and reflecting the backlight beam, the biometric detection and identification being fingerprint detection and identification.

11. An electronic device, comprising a display and a biometric detection module disposed under the display, wherein the display comprises a backlight module and a display panel, the backlight module is disposed under the display panel, the biometric detection module is at least partially disposed under the backlight module, the biometric detection module is the biometric detection module according to any one of claims 1 to 9, and the electronic device is used for fingerprint detection and identification.

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