CN210402375U - Backlight module, display, biological characteristic detection module and electronic device - Google Patents

Abstract

The utility model discloses a backlight unit for see through detection light beam to a biological characteristic detection module by external object transmission and/or reflection, detection light beam can be used for the two-dimentional or three-dimensional biological characteristic of external object to detect and discern, backlight unit can provide backlight beam for a display panel, the directive backlight unit is close to the detection light beam of biological characteristic detection module one side can see through backlight unit, and directive backlight unit is close to the backlight beam of biological characteristic detection module one side can by the backlight unit reflection. The utility model also discloses a display, biological characteristic detect module and electron device. The utility model discloses have better biological characteristic detection effect under the screen.

Description

Backlight module, display, biological characteristic detection module and electronic device

Technical Field

The utility model relates to the field of photoelectric technology, especially, relate to a backlight unit, display, biological characteristic detect module 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 this kind of scheme can realize that biological characteristic detects under the screen, nevertheless need relatively complicated technology, product cost is higher to owing to need trompil on screen and backlight unit, make the whole visual effect that shows of screen and pleasing to the eye relatively poor, and because the light leak that the trompil can lead to with show inhomogeneously, also lead to biological characteristic to detect under the screen and experience and the effect relatively poor.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a backlight module, a display, a biological characteristic detection module and an electronic device for solving the problems of the prior art.

An aspect of the utility model discloses a backlight unit can be used for a biological characteristic detection module to receive the measuring beam of outside object transmission and/or reflection through this backlight unit, 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 can be used for the two-dimentional or three-dimensional biological characteristic detection and the discernment of outside object, backlight unit can provide backlight beam for a display panel, the directive backlight unit is close to the measuring beam of biological characteristic detection module one side can see through backlight unit, and directive backlight unit is close to the backlight beam of biological characteristic detection module one side can by backlight unit reflection.

Optionally, the divergence effect of the backlight module on the backlight beam is greater than the divergence effect on the detection beam.

Optionally, the backlight module includes a reflector plate that transmits the detection beam and reflects the backlight beam, and the biometric detection module is at least partially disposed under the reflector plate.

Optionally, a deviation of a transmission angle of the detection light beam after passing through one diffusion sheet of the backlight module from an incident angle thereof is smaller than a deviation of a transmission angle of the backlight light beam after passing through the diffusion sheet from an incident angle thereof.

Optionally, the biometric characteristic detection module is at least partially disposed below the backlight module, and the biometric characteristic detection module can transmit a detection beam to an external object through the backlight module or directly transmit the detection beam to the external object, where the detection beam is infrared light with a wavelength of 800nm or more, and the backlight beam is visible light.

Optionally, the backlight module includes a reflector plate capable of transmitting the detection beam and reflecting the backlight beam, the reflector plate is formed by overlapping or attaching multiple layers of polymers with incompletely identical refractive indexes to the detection beam and the backlight beam, the reflector plate has a transmittance of more than 80% for a beam with a wavelength of more than 800nm and a reflectance of more than 90% for a beam with a wavelength of less than 780 nm.

Optionally, the diffuser is a quantum dot film or a nanoporous film.

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 on the side of, or integrated in the backlight module, the emitting unit is configured to emit the detection light beam to the external object, and the biometric detection module can collect two-dimensional or three-dimensional biometric information of the external object according to the received detection light beam to achieve biometric detection and identification.

Optionally, the backlight module includes a reflection sheet, a light guide plate and an optical assembly sequentially disposed on the reflection sheet, and a backlight disposed on one side of the light guide plate, where the backlight is configured to emit a backlight beam, the reflection sheet is configured to reflect the backlight beam emitted by the backlight to the light guide plate and allow the detection beam to directly penetrate through, the light guide plate includes a light exit surface adjacent to the optical assembly, 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 assembly, the optical assembly includes a diffusion sheet having a greater divergence effect on the backlight beam than the detection beam, and the reflection sheet reflects the backlight beam and penetrates through the detection beam.

An aspect of the utility model discloses a display, including anyone in the aforesaid backlight unit and display panel, backlight unit is used for providing backlight beam to display panel to realize image display.

An aspect of the utility model discloses a biological special detection module can see through foretell backlight unit and receive and/or transmit the detection light beam that is used for biological characteristic to detect and discern.

An aspect of the utility model discloses an electronic device, 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, backlight unit is foretell backlight unit.

Compared with the prior art, the utility model discloses electron device, backlight unit and biological characteristic detect module are through adopting to see through and to backlight beam reflection and the backlight unit who disperses the effect 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 view of an embodiment of the present invention;

fig. 6 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 backlight unit, it can be used for a biological characteristic detection module to receive the measuring beam of outside object transmission and/or reflection through this backlight unit, 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 can be used for the two-dimentional or three-dimensional biological characteristic detection and the discernment of outside object, backlight unit can provide backlight beam for a display panel, the directive backlight unit is close to the measuring beam of biological characteristic detection module one side can see through backlight unit, and directive backlight unit is close to the backlight beam of biological characteristic detection module one side can by backlight unit reflection.

The biological characteristic detection module is at least partially arranged below the backlight module, 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, and the divergence effect of the backlight module on the backlight light beam is larger than that on the detection light beam.

The backlight module comprises a reflector plate which penetrates through the detection light beam and reflects the backlight light beam, and the biological characteristic detection module is at least partially arranged below the reflector plate.

The deviation of the transmission angle of the detection light beam after penetrating through one diffusion sheet of the backlight module relative to the incidence angle of the detection light beam is smaller than the deviation of the transmission angle of the backlight light beam after penetrating through the diffusion sheet relative to the incidence angle of the detection light beam.

The biological characteristic detection module does not influence the backlight beam to be provided for a display panel for displaying and illuminating when the biological characteristic information of the external object is acquired by the detection beam. The backlight module comprises a diffusion sheet which has a larger divergence effect on the backlight light beam than the detection light beam. The diffusion sheet is a quantum dot film or a nanoporous film.

The detection light beam is infrared light with the wavelength of more than 800nm, and the backlight light beam is visible light. Backlight unit is including can seeing through the measuring beam and reflect the reflector plate of light beam in a poor light, the reflector plate is by the multilayer to the measuring beam and the polymer stack or the laminating constitution that the refracting index is not the same completely of light beam in a poor light, the reflector plate has more than 80% transmittance to the light beam of 800nm wavelength more than, has more than 90% reflectivity to the light beam of 780nm wavelength less than.

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

When the biological characteristics are detected, the detection light beam emitted by the emission unit is emitted to the outside through the backlight module and a display panel, or the detection light beam emitted by the emission unit is directly emitted to the outside through the display panel, or the detection light beam emitted by the emission 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 backlight module comprises a reflector plate, a light guide plate and an optical assembly 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 assembly, the light guide plate is used for enabling the backlight beams entering from the side surface of the light guide plate to exit from the light emergent surface and enter the optical assembly, and the optical assembly comprises the diffusion sheet.

The utility model discloses other embodiments still provide a biological characteristic detection module, biological characteristic detection module can see through foretell 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, the correlation to backlight unit is close to the backlight unit reflection of backlight beam and the correlation to of biological characteristic detection module unit one side backlight unit keeps away from the backlight unit the backlight beam of biological characteristic detection module unit one side is dispersed, measuring beam can see through backlight unit.

The utility model discloses other embodiments still provide an electronic device, 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, backlight unit is foretell backlight unit.

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 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 backlight module 10 can provide backlight beams to the liquid crystal display panel 11. The backlight beam is emitted from a backlight 140 in the backlight module 10, and enters from the side of a light guide plate 120 toward the rear portion toward a reflective sheet 110.

The detection light beam emitted to the side of the backlight module 10 adjacent to the biometric detection module 2 can pass through the backlight module 10, and the backlight light beam emitted to the side of the backlight module 10 adjacent to the biometric detection module 2 can be reflected by the backlight module 10.

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 may be 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 any limitation of the transmitting unit 21, the receiving unit 22 and the shape, structure and positional relationship therebetween.

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 beside the backlight module 10, 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 10, or the transmitting unit 21 is integrated in the backlight module 10; 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 onto an external object through the backlight assembly 10 or emit a detection beam onto an external object through the backlight assembly 10. The receiving unit 22 is capable of receiving the detection light beam reflected by an 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 may comprise a light beam that reaches the receiving unit 22 through the liquid crystal display 1. For example: the second detection beam 102 may include the first detection beam 101 reaching 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 or reflected by external objects instead of the reflected beam of the first detection beam 101. For example, the second detection beam 102 may further include visible light emitted or reflected by an external object, and the receiving unit 22 may further receive the second detection 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 or reflected by the external subject, such as radiant infrared light emitted by a biological object, thereby enabling detection of biological signs of the external subject, such as temperature, distance, heartbeat, posture, and the like.

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 assembly 130 disposed on the light guide plate 120. The backlight source 140 is used for emitting a backlight beam, and the light guide plate 120 guides the backlight beam into the optical assembly 130, and specifically, the backlight beam enters the optical assembly 130 from an exit surface of the light guide plate 120 (a surface of the light guide plate 120 adjacent to the lower diffusion plate 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 directly transmit the detection beams (the first detection beam 101 and the second detection beam 102). The light guide plate 120 includes a light exit surface (not numbered) adjacent to the optical assembly 130, and the light guide plate 120 is used for enabling the backlight beam entering from the side surface to exit from the light exit surface and enter the optical assembly 130. The reflective sheet 110 and the biometric feature detection module 2 are disposed closely or at intervals, and the biometric feature detection module 2 is at least partially disposed under the reflective sheet 110.

In the embodiments and variations, the optical assembly 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 assembly 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 assembly 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 assembly 130 are merely illustrated in the present specification and drawings, and are not limited thereto.

In this embodiment, the optical assembly 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 assembly 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 part of the light beam entering the lower diffusion sheet 131, then diffuse and transmit the part of the light beam entering the lower diffusion sheet 131, and allow a part of the light beam to directly transmit the part of the light beam. For example: the diffusion sheet 131 can convert 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 the backlight beam enters the lower diffusion sheet 131 through the light guide plate 120, wherein a part of the blue light is converted into green light and red light by the lower diffusion sheet 131, and another part of the blue light and the green light and the red light are mixed into white light and then emitted in a divergent manner. 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 the wavelength of the light beam and diverging the light beam, for example, a part of the wavelength of the 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 lower diffuser 131 therefore has a greater divergence of the backlight beam than the detection beam.

In another modified embodiment of this embodiment, the lower diffusion sheet 131 may be a nanoporous film (nanoporous PE) including a plurality of interconnected microporous structures having a diameter of 10nm to 800 nm. When the backlight beam is visible light and the detection beam (including the first detection beam 101 and the second detection beam 102) is infrared light, the backlight beam is diffracted and scattered when passing through the nanoporous film, and the detection beam is transmitted without being affected. The lower diffuser 131 thus diverges the backlight beam without diverging or significantly diverging the detection beam. The nanoporous film may be made of Polyethylene (PE) material, or Polyethylene terephthalate (PET) material, or other similar materials with good optical properties.

Although the above embodiment is described by taking the following diffusion sheet 131 as an example, the upper diffusion sheet 133 may have the same or similar structure to the lower diffusion sheet 131. In addition, in some embodiments, the lower diffusion sheet 131 and the upper diffusion sheet 133 may be integrated into a single diffusion sheet. It will be appreciated by those skilled in the art that modifications, variations, substitutions, extensions or combinations of some or all of the described embodiments or other alternative embodiments of the invention described herein, for purposes of carrying out the invention, are intended to be within the scope of the invention.

Therefore, in the above-mentioned embodiment, the modification and other embodiments of the present invention, the deviation of the transmission angle of the detection beam after penetrating through one diffusion sheet of the backlight module 10 with respect to the incident angle thereof is smaller than the deviation of the transmission angle of the backlight beam after penetrating through the diffusion sheet with respect to the incident angle thereof.

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. The detection light beam mentioned in this specification may refer to a light beam for biometric detection emitted and/or received by the biometric detection module, such as the first detection light beam 101 and/or the second detection light beam 102, and may also refer to a light beam emitted by an external object or emitted by another light source reflected by the external object and capable of being used for biometric detection.

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 a refractive index which is not completely the same 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 and the detection beam are transmitted through the multilayer optical film, and the backlight beam 103 is finally reflected due to refraction or reflection at each layer of optical film, and the detection beam is transmitted through the multilayer optical film. In other words, by continuously superposing and configuring a plurality of optical films with different optical characteristics, the backlight beam 103 is continuously refracted and reflected between the plurality of optical films, and the detection beam can pass through the plurality of optical films, so that the reflective sheet 110 can pass through the detection beam and reflect the backlight beam 103. The optical film may be made of a polymer or other material.

In this embodiment, the reflective sheet 110 is formed by laminating or adhering a plurality of layers of polymers having refractive indexes not completely identical to those of the detection beam and the backlight beam 103, and has a transmittance of 80% or more for a beam having a wavelength of 800nm or more and a reflectance of 90% or more for a beam having a wavelength of 780nm or less.

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. Since the detection light beam and the backlight light beam 103 are respectively infrared light and visible light, the biometric detection module 2 does not affect the backlight light beam to be provided to a display panel for display illumination when collecting biometric information of an external object through the detection light beam.

In a variation on the embodiment shown in fig. 4, the reflector 110 may include multiple niobium pentoxide layers and multiple silicon dioxide layers in an overlapping arrangement.

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 transmitted 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 other different position settings, which is not limited by the present invention.

Referring to fig. 5, 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 11 (such a display panel is commonly referred to as a "water droplet screen" or "beauty tip"). The emission unit 21 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. 6, 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.

Therefore, in this embodiment, the other embodiments or the modified embodiments, the backlight module 10 satisfies: the backlight beam emitted to the side of the backlight module 10 close to the biometric feature detection module 2 is reflected and the backlight beam emitted to the side of the backlight module 10 far away from the biometric feature detection module 2 is diverged. Moreover, the detection light beam can pass through the backlight module 10, whether being emitted to the side of the backlight module 10 adjacent to the biometric detection module 2 or emitted to the side of the backlight module 10 away from the biometric detection module 2. 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 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 are through adopting to see through and to backlight beam reflection and the backlight unit who disperses the effect 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.

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.

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 (12)

1. A backlight module is used for transmitting detection light beams emitted and/or reflected by an external object to a biological characteristic detection module, the detection light beams can be used for two-dimensional or three-dimensional biological characteristic detection and identification of the external object, the backlight module can provide backlight light beams for a display panel, the detection light beams emitted to one side of the backlight module, which is adjacent to the biological characteristic detection module, can transmit through the backlight module, and the backlight light beams emitted to one side of the backlight module, which is adjacent to the biological characteristic detection module, can be reflected by the backlight module.

2. The backlight module according to claim 1, wherein the backlight module diverges the backlight beam more than the detection beam.

3. The backlight module according to claim 1, wherein the backlight module comprises a reflective sheet for transmitting the detection beam and reflecting the backlight beam, and the biometric detection module is at least partially disposed under the reflective sheet.

4. A backlight module according to claim 1, wherein the backlight module comprises a diffuser, and the deviation of the transmission angle of the detection beam after passing through the diffuser from the incident angle thereof is smaller than the deviation of the transmission angle of the backlight beam after passing through the diffuser from the incident angle thereof.

5. The backlight module according to claim 1, wherein the biometric detection module is disposed at least partially under the backlight module, and the biometric detection module is capable of emitting a detection beam onto an external object through the backlight module or directly emitting the detection beam onto the external object, the detection beam is infrared light with a wavelength of 800nm or more, and the backlight beam is visible light.

6. The backlight module according to any one of claims 1-2 and 4-5, wherein the backlight module comprises a reflective sheet capable of transmitting the detection beam and reflecting the backlight beam, the reflective sheet is formed by laminating or adhering multiple layers of polymers having different refractive indexes for the detection beam and the backlight beam, and the reflective sheet has a transmittance of 80% or more for a beam having a wavelength of 800nm or more and a reflectance of 90% or more for a beam having a wavelength of 780nm or less.

7. A backlight module according to claim 4, wherein the diffuser is a quantum dot film or a nanoporous film.

8. The backlight module according to claim 1, wherein the biometric detection module comprises an emitting unit and a receiving unit, the receiving unit is capable of receiving a detection beam from the emitting unit reflected by an external object through the backlight module, the emitting unit is disposed below, beside or integrated in the backlight module, the emitting unit is used for emitting the detection beam to the external object, and the biometric detection module is capable of collecting two-dimensional or three-dimensional biometric information of the external object according to the received detection beam to achieve biometric detection and identification.

9. The backlight module according to claim 1, wherein the backlight module comprises a reflective sheet, a light guide plate and an optical assembly sequentially disposed on the reflective sheet, and a backlight disposed on one side of the light guide plate, the backlight is configured to emit a backlight beam, the reflective sheet is configured to reflect the backlight beam emitted from the backlight to the light guide plate and allow the detection beam to directly transmit therethrough, the light guide plate comprises a light exit surface adjacent to the optical assembly, the light guide plate is configured to allow the backlight beam entering from a side surface thereof to exit from the light exit surface and enter the optical assembly, the optical assembly comprises a diffuser sheet having a greater divergence effect on the backlight beam than the detection beam, and the reflective sheet reflects the backlight beam and transmits the detection beam.

10. A display comprising the backlight module as claimed in any one of claims 1 to 9 and a display panel, wherein the backlight module is configured to provide a backlight beam to the display panel for displaying an image.

11. A biometric detection module, characterized in that it is capable of receiving and/or emitting a detection beam for biometric detection and identification through a backlight module as claimed in any one of claims 1 to 9.

12. An electronic device, comprising a display and a biometric feature detection module disposed below the display, wherein the display comprises a backlight module and a display panel, the backlight module is disposed below the display panel, the biometric feature detection module is at least partially disposed below the backlight module, and the backlight module is the backlight module according to any one of claims 1 to 9.

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