CN210155472U - Backlight module, display and electronic device - Google Patents
Backlight module, display and electronic device Download PDFInfo
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- CN210155472U CN210155472U CN201920528292.4U CN201920528292U CN210155472U CN 210155472 U CN210155472 U CN 210155472U CN 201920528292 U CN201920528292 U CN 201920528292U CN 210155472 U CN210155472 U CN 210155472U
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/64—Three-dimensional objects
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
- G06V40/161—Detection; Localisation; Normalisation
- G06V40/166—Detection; Localisation; Normalisation using acquisition arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
- G06V40/172—Classification, e.g. identification
Abstract
The utility model discloses a backlight module for see through by the detection light beam of outside object transmission and/or reflection to a biological characteristic detection module, biological characteristic detection module is used for carrying out corresponding sensing according to received detection light beam. The backlight module includes: a light guide plate; a diffusion membrane; the backlight source is used for providing backlight beams and entering the diffusion film through the light guide plate; the diffusion film comprises diffusion layers which are sequentially arranged on the light guide plate, the diffusion layers comprise a plurality of diffusion particles, detection light beams entering the diffusion layers can penetrate through the diffusion layers through intervals among the diffusion particles, backlight light beams entering the diffusion layers are lengthened by the diffusion particles and diffused by the emergent angles and then penetrate through the diffusion layers. The utility model also discloses a display and electron device.
Description
Technical Field
The utility model relates to the field of photoelectric technology, especially, relate to a backlight unit, display 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 characteristics under the screen, the relatively complex process is needed, the product cost is higher, and the holes are needed on the screen and the backlight module, so that the visual effect of the whole display of the screen is poorer.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a backlight module, a display and an electronic device for use under a screen for solving the problems of the prior art.
An aspect of the utility model discloses a backlight module, a serial communication port for see through by the detection light beam of outside object transmission and/or reflection to a biological characteristic detection module, biological characteristic detection module is used for carrying out corresponding sensing according to received detection light beam, backlight module includes:
a light guide plate;
a diffusion film positioned above the light guide plate;
the backlight source is used for providing backlight beams and entering the diffusion film through the light guide plate;
the diffusion film comprises a diffusion layer arranged on the light guide plate, the diffusion layer comprises a plurality of diffusion particles, the diffusion particles are used for carrying out wavelength conversion on at least part of backlight beams entering the diffusion layer and diffusing the backlight beams with converted wavelengths, and detection beams entering the diffusion layer can penetrate through the diffusion layer through intervals among the diffusion particles.
Alternatively, the backlight beams transmitted from the diffusion layer have different wavelengths, and the backlight beams having different wavelengths can be mixed into white light.
Optionally, the wavelength of the backlight beam provided by the backlight source is smaller than the wavelength of the detection beam.
Optionally, the backlight beam is blue light or ultraviolet light.
Alternatively, when the backlight beam is blue light, the diffusion particles are used to convert a part of the blue light from the backlight into red light and green light, and the converted red light and green light and the unconverted blue light can be mixed into white light.
Optionally, when the backlight beam is ultraviolet light, the diffusion particles are configured to convert the ultraviolet light from the backlight source into red light, green light, and blue light, and the converted red light, green light, and blue light can be mixed into white light.
Optionally, the diffusion sheet is a quantum dot film.
Optionally, when the detection light beam is infrared light, the transmittance of the quantum dot film to the detection light beam is not less than 50%.
Optionally, the diffusion particles are quantum dots, the quantum dots include nanocrystal cores and nanocrystal shells wrapping the nanocrystal cores, the wavelength of light beams is lengthened after entering the nanocrystal cores, and the diameter range of the quantum dots is 1 nm-10 nm.
Optionally, the detection light beam includes infrared light, the backlight module further includes a reflector plate disposed below the light guide plate, the reflector plate can reflect visible light and transmit infrared light, and the reflector plate and the biological characteristic detection module are disposed closely or at intervals.
Optionally, the backlight module further includes an antireflection film disposed on a lower surface of the reflector plate for improving transmittance of the reflector plate to the detection light beam.
Optionally, the diffusion film further includes a lower substrate located between the diffusion layer and the light guide plate, the lower substrate being made of a light-transmitting material; and/or the diffusion film further comprises an upper substrate positioned on one side of the diffusion layer, which faces away from the light guide plate, wherein the upper substrate is made of a light-transmitting material.
Optionally, the diameter range of the diffusion particles is 1nm to 10 nm.
Optionally, the diameter range of the diffusion particles is 1nm to 8 nm.
Optionally, the detection light beam is infrared light, and the wavelength range of the infrared light is 850nm to 1000 nm.
Optionally, the backlight module is a backlight module saving prism sheets or brightness enhancement sheets.
An aspect of the utility model discloses a display, including anyone in the aforesaid backlight unit with set up the liquid crystal display panel of backlight unit top.
An aspect of the utility model discloses a biological characteristic detects module, a serial communication port, biological characteristic detects module can see through foretell display and receive and/or transmit the measuring beam that is used for biological characteristic to detect.
An aspect of the utility model discloses an electronic device, including display and biological characteristic detection module assembly, the display includes backlight unit and display panel, backlight unit sets up the display panel below, biological characteristic detection module assembly sets up partially at least backlight unit below, backlight unit is arbitrary in the aforesaid, biological characteristic detection module assembly can pass through thereby backlight unit and display panel's display area transmission and/or receipt measuring beam realize detection and discernment to external object biological characteristic information.
Compared with the prior art, the utility model discloses an adopt the backlight unit that has good transmissivity to the measuring beam to need punch on backlight unit just can realize the biological feature under the screen and detect and discern, have better whole visual effect and user experience, also reduced manufacturing cost from the one side. Furthermore, the utility model discloses a set up biological characteristic detection module in can changing the backlight beam wavelength and then improve the white light that diverges and can see through the backlight unit below of measuring beam, can be better through backlight unit transmission and/or receive measuring beam for biological characteristic detection effect is better under the screen.
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 schematic cross-sectional view of a portion of the diffusion membrane of the embodiment of FIG. 1;
fig. 4 is a schematic diagram of a transmittance curve of a reflector according to an embodiment of the present invention;
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 invention, it will be understood that when a substrate, 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 module, a biological characteristic detection module can see through this backlight module transmission and/or receive measuring beam, measuring beam is used for the detection and the discernment of the biological characteristic information of external object, backlight module can partly change the backlight beam wavelength of specific wavelength and diverge by the backlight beam of converted wavelength and provide a display panel for white light with the backlight beam mixing of different wavelengths.
The backlight module comprises a reflection sheet adjacent to the biological characteristic detection module, a light guide plate arranged on the reflection sheet, a backlight source arranged on one side of the light guide plate and a diffusion film arranged on the light guide plate, wherein the backlight source is used for emitting backlight beams and enters the diffusion film through one light-emitting surface of the light guide plate, and the diffusion film can change the wavelength of a part of the light beams entering the diffusion film, then the part of the light beams divergently penetrates through the diffusion film and allows a part of the light beams entering the diffusion film to directly penetrate through the diffusion film.
The biological characteristic detection module comprises a transmitting unit and a receiving unit, when biological characteristic detection is carried out, a detection light beam transmitted by the transmitting unit sequentially passes through the reflector plate, the light guide plate, the diffusion film and the optical sheet to be emitted to the outside of the backlight module, is reflected by an external object and then sequentially passes through the optical sheet, the diffusion film, the light guide plate and the reflector plate to reach the receiving unit, and the biological characteristic detection module obtains two-dimensional or three-dimensional biological characteristic information of the external object according to the received detection light beam.
The diffusion film is including setting gradually infrabasal plate, diffusion layer and upper substrate on the light guide plate, upper and infrabasal plate are the printing opacity material and make, the diffusion layer includes a plurality of diffusion particles that are used for changing the light beam wavelength, gets into the detection beam of diffusion layer can pass through interval between the diffusion particle sees through the diffusion layer, gets into partly of the visible light beam of the backlight emission of diffusion layer passes through interval between the diffusion particle sees through the diffusion layer, another part quilt the diffusion particle is seen through after lengthening its wavelength and diverging exit angle the diffusion layer.
In this embodiment, the detection light beam may be infrared light, the reflector plate may reflect visible light and transmit infrared light, and the reflector plate and the biometric feature detection module are disposed closely or at an interval. The backlight is capable of emitting blue or ultraviolet light, the diffusing particles are capable of converting a portion of the blue light from the backlight into red and green light, and the converted red and green light and the unconverted blue light are capable of mixing into white light; or the diffusing particles can convert ultraviolet light from a backlight into red, green, and blue light, which can be mixed into white light.
The utility model discloses other embodiments still provide a biological characteristic detection module assembly, biological characteristic detection module assembly can see through backlight unit receives and/or launches the testing beam that is used for the biological characteristic to detect, backlight unit can provide backlight for a display panel, backlight unit can be partial the wavelength of the backlight beam of the specific wavelength of conversion with disperse by the backlight beam of conversion wavelength to mix the backlight beam of different wavelengths and provide a display panel for white light.
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 sets up at least partially the backlight unit below, biological characteristic detection module assembly can pass through thereby backlight unit and display panel transmission and/or receiving measuring beam realize the detection and the discernment to external object biological characteristic information, backlight unit can be used for becoming the backlight beam who has different longer wavelengths with the shorter wavelength in it and will the backlight beam of different wavelengths mixes into white light and provides in display panel, the permission measuring beam sees through.
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 disposed adjacent to the backlight module 10 and below the backlight module 10. The biometric detection module 2 is at least partially disposed under the backlight module 10. The biometric detection module 2 is capable of emitting and/or receiving a detection light beam through the liquid crystal display 1.
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. For another example, the emission unit 21 is disposed in the liquid crystal display panel 11 without overlapping, for example, under a glass cover plate substantially flush with the liquid crystal display panel 11.
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.
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 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 below the backlight module 10 and directly faces the display area. 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, for example, both facing the display area, and the electronic device can be used for fingerprint or face detection and recognition.
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 assembly 10 or directly emit a detection beam to an external object, and the receiving unit 22 can receive the detection beam reflected by the external object through the backlight assembly 10. The receiving unit 22 can also receive other light beams emitted 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 reflected by an external object, and the reflected light passes through the liquid crystal display panel 11 and the backlight module 10 and then reaches the receiving unit 22. 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 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.
The biometric detection module 2 can acquire two-dimensional image information or biometric information of the external object by collecting 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 a shift of the second detection beam 102 with respect to the first detection 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 150 disposed on one side of the light guide plate, a diffusion film 130 disposed on the light guide plate 120, and an optical sheet 140 disposed on the diffusion film 130. The backlight 150 is used for emitting a backlight beam and entering the diffusion film 130 through a light-emitting surface of the light guide plate 120 (the surface of the light guide plate 120 adjacent to the diffusion film 130 in fig. 2). The diffusion film 130 is capable of changing the wavelength of a part of the light beam entering the diffusion film 130 and transmitting the part of the light beam entering the diffusion film 130, and allowing a part of the light beam to directly transmit. For example: the diffusion film 130 is capable of changing a backlight beam of a shorter wavelength into a backlight beam having a different longer wavelength. The backlight module 10 can partially convert the wavelength of the backlight beam with a specific wavelength and diverge the backlight beam with the converted wavelength.
The backlight beams mentioned in this specification may refer to light beams emitted from the backlight 150 in the backlight module 10, light beams emitted from the backlight 150 and having wavelengths changed by the diffusion film 130, or 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 optical sheet 140 can uniformly mix and converge the backlight beams with different wavelengths transmitted through the diffusion film 130 to form white light, and provide the white light to the liquid crystal display panel 11 as display illumination.
In this embodiment or variations, the optical sheet 140 may include one or more diffusers for uniform mixing of light beams, or one or more brightness enhancement sheets for light beam convergence and brightness enhancement, or the optical sheet 140 may include a combination of diffusers and brightness enhancement sheets.
In the embodiment and the modified embodiment, the optical sheet 140 may include one or more Diffusion sheets (DF) for uniform mixing of light beams, or one or more Brightness Enhancement Films (BEF) for light beam convergence and Brightness Enhancement, or a combination of the Diffusion sheets and the Brightness Enhancement films. For example, the optical sheet 140 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 140 includes a lower diffusion sheet, a lower brightness enhancement sheet, an upper diffusion sheet and an upper brightness enhancement sheet sequentially arranged from bottom to top. The structure and composition of the optical sheet 140 are merely schematically illustrated in the present specification and the drawings, and are not limited thereto.
In this embodiment, the optical sheet 140 illustrated in fig. 1 includes a lower light enhancement sheet 141 disposed on the diffusion film 130 and an upper light enhancement sheet 142 disposed on the lower light enhancement sheet 141. The reflective sheet 110 is used for reflecting the backlight beam emitted from the backlight source 150 to the light guide plate 120, the light guide plate 120 includes a light-emitting surface adjacent to the diffusion film 130, and the light guide plate 120 is used for forming the backlight beam emitted from the backlight source 150 into a surface light source to be emitted from the light-emitting surface. The reflective sheet 110 and the biometric characteristic detection module 2 are closely attached or spaced.
In this embodiment, the first detection beam 101 and the second detection beam 102 are invisible light, and preferably infrared light with a wavelength range of 850-1000 nanometers (nm). In other or modified embodiments, the first detecting beam 101 and the second detecting beam 102 may be one or more of visible light, invisible light, ultraviolet light, infrared light, ultrasonic waves, electromagnetic waves, and the like.
In the embodiment or the modified embodiment, the first detecting beam 101 or the second detecting beam 102 may be one or more of floodlight, speckle structured light, coded structured light, and modulated pulse signal.
In the embodiment or the modified embodiment of the present invention, the number of the transmitting units 21 of the biometric detection module 2 may be one or more, the number of the receiving units 22 may be one or more, and the transmitting units 21 and the receiving units 22 may be used to draw a two-dimensional and/or three-dimensional image of an external object based on Time of Flight (TOF), Structured Light (Structured Light), Binocular Stereo Vision (Binocular Stereo Vision), and other technologies, or to collect and identify two-dimensional and/or three-dimensional biometric information of the external object, such as fingerprint identification or face identification under a screen.
In the embodiment or the modified embodiment of the present invention, the Emitting unit 21 may include a Vertical Cavity Surface Emitting Laser (VCSEL), or a Light Emitting Diode (LED), or other types of light Emitting chips. The receiving unit 22 may comprise an infrared image sensor capable of receiving infrared light beams and converting them into corresponding electrical signals. In other or modified embodiments, the receiving unit 22 may be a visible light image sensor, or other types of photoelectric conversion chips.
In alternative embodiments, the liquid crystal display 1 may also be other types of non-self-luminous displays, or other self-luminous displays, and the liquid crystal display panel 11 may also be other types of display panels. The present invention is not limited thereto.
Fig. 3 is an enlarged cross-sectional view of a portion of the diffusion film 130. The diffusion film 130 includes a lower substrate 131, a diffusion layer 132, and an upper substrate 133 sequentially disposed on the light guide plate 120. The diffusion layer 132 is disposed between the upper substrate 133 and the lower substrate 131, and the upper substrate 133 and the lower substrate 131 protect the diffusion layer 132. The upper and lower substrates may be made of a flexible light-transmitting material. The diffusion layer 132 includes a plurality of diffusion particles 134 for changing a wavelength of a light beam, and the diffusion particles 134 are uniformly distributed in the diffusion layer 132.
The detection beam (i.e., the first detection beam 101 or the second detection beam 102) entering the diffusion layer 132 through the lower substrate 131 or the upper substrate 133 can transmit through the diffusion layer 132 through the spaces between the diffusion particles 134 and can further exit to the outside through the upper substrate 133 or enter the receiving unit 22 through the lower substrate 131.
A part of the backlight beam 103 emitted from the backlight 150 entering the diffusion layer 132 passes through the diffusion layer 132 through the spaces between the diffusion particles 134, and the other part is made longer in wavelength by the diffusion particles 134 and is made to diverge in emission angle and then passes through the diffusion layer 132.
Alternatively, in some embodiments, the lower substrate 131 or/and the upper substrate 133 may be omitted.
Alternatively, in some embodiments, the diffusion particles 134 may also be non-uniformly or randomly distributed in the diffusion layer 132.
In the present embodiment, the diffusion particles 134 have a diameter ranging from 1nm to 10nm, for example. Alternatively, in certain embodiments, the diffusion particles 134 have a diameter in the range of 1nm to 8 nm. Accordingly, if the total number of the diffusion particles 134 is constant, the intervals between the diffusion particles 134 become large, and the amount of the detection beam transmitted becomes large, thereby facilitating detection and recognition.
In this embodiment, the detection beam (i.e., the first detection beam 101 or the second detection beam 102) can pass through the diffusion layer 132 through the space between the diffusion particles 134. Optionally, in some embodiments, the detection beam may also penetrate the diffusion particle 134.
The backlight 150 includes a light emitting unit 151. The light emitting unit 151 may be disposed on one circuit board 152. The light emitting unit 152 may be a Light Emitting Diode (LED), and the light emitting unit 152 may be configured to emit blue light or ultraviolet light.
In this embodiment, the backlight 150 can emit blue light, the diffusion particles 134 can convert a portion of the blue light from the backlight 150 (the backlight beam 103 in fig. 3) into red light and green light, and the converted red light and green light and the unconverted blue light can be mixed into white light, as shown in fig. 3.
In a modified embodiment of this embodiment, the backlight 150 can emit ultraviolet light, the diffusion particles 134 can convert the ultraviolet light from the backlight 150 into red light, green light, and blue light, and the converted red light, green light, and blue light can be mixed into white light.
In this or a variation, the diffusion particles 134 are, for example but not limited to, quantum dots comprising a nanocrystal core and a nanocrystal shell surrounding the nanocrystal core, wherein the wavelength of the light beam is increased after entering the nanocrystal core, and the diameter of the quantum dots is in the range of 1nm to 10 nm. Optionally, in certain embodiments, the quantum dots have a diameter in the range of 1nm to 8 nm.
In other embodiments of the present invention, the diffusion film 130 is a quantum dot film having optical characteristics of changing the wavelength of the light beam and diverging the light path, for example, a part of the wavelength of the incident blue light can 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%.
In the embodiment or the modified embodiment, the diffusion film 130 is capable of partially converting the wavelength of the backlight beam of a specific wavelength and diverging the backlight beam of the converted wavelength.
Referring to fig. 4, a graph of transmittance of a reflector plate for light beams of different wave bands is shown in a modified embodiment of the present invention. The reflective sheet is made of the same material and process as the reflective sheet 110 in the above embodiment. Therefore, the reflective sheet 110 can be nearly completely reflected with respect to visible light, has a good transmittance with respect to infrared light, and maximizes the transmittance of infrared light in the wavelength range of 900nm to 1000nm (nm represents nanometers).
The utility model discloses in the above-mentioned or change embodiment, the position that biological characteristic detected module 2 set up corresponds in the middle of the liquid crystal display panel 11 bottom, perhaps biological characteristic detects module 2 and can also have different position settings, the utility model discloses do not make the restriction.
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.
In the above or modified embodiment of the present invention, the liquid crystal display panel 11 may include two substrates disposed oppositely, and the liquid crystal layer between the two substrates, a plurality of Thin Film Transistors (TFT) disposed on the substrates, a plurality of gate lines, a plurality of data lines, a plurality of pixel electrodes, and the like, and a plurality of pixel units formed by the same and distributed in an array, and a data driving circuit, a timing control circuit, a power supply circuit, and the like.
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 and biological characteristic detect module have the backlight unit of good transmissivity through adopting to detecting the light beam to need punch on backlight unit just can realize the biological characteristic detection and the discernment under the screen, have better whole visual effect and user experience, also reduced process cost from the one side. Furthermore, the utility model discloses a set up biological characteristic detection module in can changing the backlight beam wavelength and then improve the white light that diverges and can see through the backlight unit below of measuring beam, can be better through backlight unit transmission and/or receive measuring beam for biological characteristic detection effect is better under the screen.
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.
Alternatively, in some embodiments, the brightness enhancement sheet or the prism sheet may be optionally omitted.
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 (16)
1. A backlight module for transmitting a detection beam emitted and/or reflected by an external object to a biometric detection module, the biometric detection module performing corresponding sensing according to the received detection beam, the backlight module comprising:
a light guide plate;
a diffusion film positioned above the light guide plate;
the backlight source is used for providing backlight beams and entering the diffusion film through the light guide plate;
the diffusion film comprises a diffusion layer arranged on the light guide plate, the diffusion layer comprises a plurality of diffusion particles, the diffusion particles are used for carrying out wavelength conversion on at least part of backlight beams entering the diffusion layer and diffusing the backlight beams with converted wavelengths, and detection beams entering the diffusion layer can penetrate through the diffusion layer through intervals among the diffusion particles.
2. The backlight module according to claim 1, wherein the backlight beams transmitted from the diffusion layer have different wavelengths, and the backlight beams having different wavelengths can be mixed into white light.
3. The backlight module according to claim 1, wherein the backlight source provides a backlight beam having a wavelength smaller than that of the detection beam.
4. The backlight module as claimed in claim 1, wherein the backlight beam is blue light or ultraviolet light; when the backlight beam is blue light, the diffusion particles are used for converting a part of the blue light from the backlight source into red light and green light, and the converted red light and the green light and the unconverted blue light can be mixed into white light; when the backlight beam is ultraviolet light, the diffusion particles are used for converting the ultraviolet light from the backlight source into red light, green light and blue light, and the converted red light, green light and blue light can be mixed into white light.
5. A backlight module according to claim 1 or 4, wherein the diffuser film is a quantum dot film.
6. The backlight module according to claim 5, wherein when the detection beam is infrared light, the transmittance of the quantum dot film to the detection beam is not less than 50%.
7. The backlight module according to claim 1 or 4, wherein the diffusion particles are quantum dots, the quantum dots comprise nanocrystal cores and nanocrystal shells wrapping the nanocrystal cores, the wavelength of the light beam is lengthened after entering the nanocrystal cores, and the diameter of the quantum dots ranges from 1nm to 10 nm.
8. The backlight module according to claim 1, wherein the detection beam comprises infrared light, the backlight module further comprises a reflective sheet disposed under the light guide plate, the reflective sheet is capable of reflecting visible light and transmitting infrared light, and the reflective sheet and the biometric detection module are disposed closely or at an interval.
9. The backlight module as claimed in claim 8, further comprising an anti-reflection film disposed on a lower surface of the reflector plate for increasing transmittance of the reflector plate to the detection beam.
10. The backlight module according to claim 1, wherein the diffusion film further comprises a lower substrate between the diffusion layer and the light guide plate, the lower substrate being made of a light transmissive material; and/or the diffusion film further comprises an upper substrate positioned on one side of the diffusion layer, which faces away from the light guide plate, wherein the upper substrate is made of a light-transmitting material.
11. The backlight module as claimed in claim 1, wherein the diameter of the diffusion particles is in the range of 1nm to 10 nm.
12. The backlight module as claimed in claim 1, wherein the diameter of the diffusion particles is in the range of 1nm to 8 nm.
13. The backlight module as claimed in claim 1, wherein the detection beam is infrared light having a wavelength ranging from 850nm to 1000 nm.
14. The backlight module of claim 1, wherein the backlight module is a backlight module saving prism sheets or brightness enhancement sheets.
15. A display comprising the backlight module according to any one of claims 1-14 and a liquid crystal display panel disposed over the backlight module.
16. An electronic device, comprising a display and a biometric detection module, wherein the display comprises a backlight module and a display panel, the backlight module is disposed below the display panel, the biometric detection module is at least partially disposed below the backlight module, the backlight module is the backlight module according to any one of claims 1 to 14, and the biometric detection module can emit and/or receive detection light beams through display areas of the backlight module and the display panel, so as to detect and identify biometric information of an external object.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2019/077587 WO2020181444A1 (en) | 2019-03-11 | 2019-03-11 | Biological characteristic detection module, backlight module, display, and electronic device |
| IBPCT/CN2019/077587 | 2019-03-11 |
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| CN210155472U true CN210155472U (en) | 2020-03-17 |
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| CN201920528292.4U Active CN210155472U (en) | 2019-03-11 | 2019-04-18 | Backlight module, display and electronic device |
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| CN201980000394.1A Pending CN110073366A (en) | 2019-03-11 | 2019-03-11 | Biological characteristic detects mould group, backlight module, display and electronic device |
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| EP4187437A4 (en) * | 2020-07-23 | 2024-01-24 | Vivo Mobile Communication Co Ltd | Display assembly and display device |
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| CN112394562A (en) * | 2020-11-27 | 2021-02-23 | 武汉华星光电技术有限公司 | Electronic terminal and display module |
| CN114660696A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Light guide plate with infrared ray transmitting and visible light reflecting functions and backlight module |
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| CN113343195A (en) * | 2021-05-27 | 2021-09-03 | 维沃移动通信有限公司 | Electronic equipment and fingerprint unlocking method and fingerprint unlocking device thereof |
| CN113296306B (en) * | 2021-06-03 | 2022-12-30 | 武汉天马微电子有限公司 | Liquid crystal display device |
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| EP4187437A4 (en) * | 2020-07-23 | 2024-01-24 | Vivo Mobile Communication Co Ltd | Display assembly and display device |
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| WO2020181444A1 (en) | 2020-09-17 |
| CN110073366A (en) | 2019-07-30 |
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