WO2021196034A1 - Under-screen fingerprint identification apparatus, backlight module, liquid crystal display screen, and electronic device - Google Patents
Under-screen fingerprint identification apparatus, backlight module, liquid crystal display screen, and electronic device Download PDFInfo
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- WO2021196034A1 WO2021196034A1 PCT/CN2020/082604 CN2020082604W WO2021196034A1 WO 2021196034 A1 WO2021196034 A1 WO 2021196034A1 CN 2020082604 W CN2020082604 W CN 2020082604W WO 2021196034 A1 WO2021196034 A1 WO 2021196034A1
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- WIPO (PCT)
- Prior art keywords
- light guide
- liquid crystal
- backlight module
- guide plate
- film
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
Definitions
- This application relates to the field of fingerprint identification technology, and in particular to an under-screen fingerprint identification device, a backlight module, a liquid crystal display and electronic equipment.
- Fingerprint recognition and unlocking has become a basic function that most mobile terminals such as mobile phones and tablet computers are equipped with. With the pursuit of full screens of mobile terminals by users, the application of under-screen fingerprint recognition technology has become more and more widespread, among which under-screen optical fingerprint recognition technology is the most popular.
- mobile terminals with under-screen optical fingerprint recognition on the market all use Organic Light-Emitting Diode (OLED) displays, but the cost of OLED displays is relatively high, so liquid crystal displays (LCD) are used.
- OLED Organic Light-Emitting Diode
- LCD liquid crystal displays
- This application provides an under-screen fingerprint identification device, a backlight module, a liquid crystal display and electronic equipment, which can alleviate or eliminate the film interference phenomenon generated by the backlight module and ensure the fingerprint imaging effect.
- the present application provides an under-screen fingerprint identification device, which is suitable for electronic equipment with a liquid crystal display, and the fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display;
- the under-screen fingerprint identification device includes a fingerprint identification module located below the backlight module of the liquid crystal display, and the fingerprint identification module is used to receive the fingerprint identification module formed by the reflection or transmission of the finger above the fingerprint detection area. Pass the fingerprint detection light of the liquid crystal display to obtain the fingerprint image of the finger;
- the backlight module includes a diffuser film, a light guide plate and a reflective film
- the light guide plate is arranged adjacently below the diffuser film
- the surface of the diffuser film facing the light guide plate has a plurality of spaced first A microstructure
- the first microstructure is randomly distributed on the lower surface of the diffusion film and used to increase the distance between the diffusion film and the light guide plate
- the reflective film is adjacently arranged on the guide plate Below the light plate
- the surface of the reflective film facing the light guide plate has a plurality of second microstructures arranged at intervals
- the second microstructures are randomly distributed on the upper surface of the reflective film and used to increase the reflection
- the distance between the film and the light guide plate can not only avoid film interference between the diffusion film and the light guide plate, and between the light guide plate and the reflective film, but also can avoid the first micro Moire fringes are formed between the structure or the second microstructure and the light guide groove of the light guide plate, so that the fingerprint imaging effect can be improved, so that the under-screen fingerprint identification
- the present application provides a backlight module suitable for a liquid crystal display that supports under-screen fingerprint recognition.
- the backlight module includes a diffuser film, a light guide plate, and a reflective film.
- the light guide plate is adjacently arranged on the diffuser Below the film, the surface of the diffusion film facing the light guide plate has a plurality of first microstructures arranged at intervals, and the first microstructures are randomly distributed on the lower surface of the diffusion film and used to increase the diffusion
- the distance between the film and the light guide plate, the reflective film is adjacently arranged below the light guide plate, the surface of the reflective film facing the light guide plate has a plurality of second microstructures arranged at intervals, the The second microstructures are randomly distributed on the upper surface of the reflective film and are used to increase the distance between the reflective film and the light guide plate, which can not only prevent the diffusion film and the light guide plate, but also Thin film interference occurs between the light guide plate and the reflective film, which can also prevent the formation of moiré fringes between the first microstructure or
- the present application provides a liquid crystal display that supports an under-screen fingerprint identification function.
- the under-screen fingerprint identification device described in the first aspect is arranged below the liquid crystal display, and the liquid crystal display includes a liquid crystal module and the second
- the backlight module described in the aspect is located under the liquid crystal module, and is used to provide backlight for the liquid crystal module, and transmits the fingerprint detection light formed by the reflection or transmission of the finger above the liquid crystal display to all under the backlight module. Describes the fingerprint recognition device under the screen.
- the present application provides an electronic device, which may include the liquid crystal display screen described in the third aspect and the under-screen fingerprint identification device described in the first aspect.
- the liquid crystal display screen includes a liquid crystal module and the liquid crystal display device described in the second aspect.
- the backlight module wherein the backlight module is located below the liquid crystal module.
- Figure 1 is a schematic diagram of the structure of an under-screen fingerprint identification device in an electronic device with a display screen
- FIG. 2 is a schematic diagram of the bonding gap between two layers of optical film materials of the backlight module
- 3 is a thin film interference pattern generated between two optical films of the backlight module of FIG. 2;
- FIG. 4 is a schematic structural diagram of a backlight module provided by Embodiment 1 of the application;
- Fig. 5 is a bottom view of the diffusion film provided in the first embodiment of the application.
- FIG. 6 is a schematic diagram of the structure of the light guide plate provided in Embodiment 1 of the application.
- FIG. 7a to 7c are schematic diagrams of the liquid crystal module provided in Embodiment 1 of the application;
- FIG. 8 is a schematic diagram of another backlight module provided in Embodiment 1 of the application.
- portable or mobile computing devices such as smartphones, notebook computers, tablet computers, and gaming devices, as well as other electronic devices such as electronic databases, automobiles, and bank automated teller machines (ATM).
- ATM bank automated teller machines
- the embodiment of the present application does not limit this.
- biometric recognition technologies include, but are not limited to, fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
- fingerprint recognition technology for ease of description, the following uses fingerprint recognition technology as an example for description.
- Under-screen fingerprint recognition technology means that the fingerprint recognition module is installed below the display screen, so that fingerprint recognition operations can be performed in the display area of the display screen, without the need to set a fingerprint collection area on the front of the electronic device except for the display area.
- the fingerprint identification module uses light returned from the top surface of the display assembly of the electronic device to perform fingerprint sensing and other sensing operations. This returned light carries information about objects (for example, fingers) in contact with the top surface of the display assembly, and the fingerprint recognition module located below the display assembly collects and detects this returned light to realize fingerprint recognition under the screen.
- FIG. 1 is a schematic diagram of the structure of an under-screen fingerprint identification device in an electronic device with a display screen
- Figure 2 is a schematic diagram of the bonding gap between the two layers of optical films of the backlight module
- Figure 3 is the backlight module of Figure 2 The film interference pattern generated between the two optical film materials in the group
- FIG. 4 is a schematic structural diagram of the backlight module provided in the first embodiment of the application
- FIG. 5 is a bottom view of the diffusion film provided in the first embodiment of the application
- FIG. 6 Fig. 7a-7c are schematic diagrams of the liquid crystal module provided in the embodiment 1 of this application
- Fig. 8 is a schematic diagram of another backlight module provided in the embodiment 1 of this application Schematic.
- the same components may use the same reference numerals.
- this embodiment provides an under-screen fingerprint identification device 1, which is suitable for electronic equipment with a liquid crystal display 2.
- the fingerprint detection area of the under-screen fingerprint identification device 1 is at least partially located in the display area of the liquid crystal display 2. .
- the under-screen fingerprint identification device 1 provided in this embodiment can be applied to the liquid crystal display screen 2.
- the under-screen fingerprint identification device 1 is an under-screen optical fingerprint identification device, which can be applied to smart phones, tablet computers, and other liquid crystal displays. Screen 2 on the mobile terminal or electronic device.
- the under-screen fingerprint identification device 1 may be arranged in a partial area below the liquid crystal display 2 and cooperate with the liquid crystal display 2 to form an under-screen fingerprint identification system.
- the fingerprint detection area of the under-screen fingerprint identification device 1 may be specifically located in at least part of the display area of the liquid crystal display 2. For example, by placing a finger above the corresponding fingerprint detection area in the display area of the liquid crystal display 2, so that the fingerprint identification device 1 under the screen acquires and recognizes the fingerprint image of the finger.
- the liquid crystal display 2 generally includes a liquid crystal module 21 and a backlight module 22.
- the backlight module 22 is arranged under the liquid crystal module 21 to provide a backlight source for the liquid crystal module 21 to make the liquid crystal module 21 21 can display images for users to watch.
- the liquid crystal module 21 also includes a wiring module 24 arranged in the non-display area of the liquid crystal module 21 to realize the electrical connection between the liquid crystal module 21 and the outside world.
- the under-screen fingerprint identification device 1 may include a fingerprint identification module 11 located below the backlight module 22 of the liquid crystal display 2, and the fingerprint identification module 11 is used to receive the fingerprints formed by the reflection or transmission of the finger above the fingerprint detection area. The fingerprint detection light of the liquid crystal display 2 is transmitted to obtain the fingerprint image of the finger.
- the under-screen fingerprint recognition device 1 includes a fingerprint recognition module 11, the fingerprint recognition module 11 may include a fingerprint sensor 112, the fingerprint sensor 112 may be an optical fingerprint sensor 112, and the fingerprint sensor 112 may include multiple sensing units.
- the sensing area of the optical sensing array may correspond to the fingerprint recognition area of the fingerprint sensor 112.
- the fingerprint sensor 112 may be located under the fingerprint detection area of the liquid crystal display 2.
- the fingerprint sensor 112 is located under the backlight module 22 directly opposite the fingerprint detection area of the liquid crystal display 2.
- the fingerprint detection light carrying fingerprint information formed by the reflection or transmission of the finger is transmitted to the fingerprint sensor 112 through the backlight module 22, and the fingerprint image is acquired and recognized through the fingerprint recognition area of the fingerprint sensor 112.
- the fingerprint detection area corresponding to the under-screen fingerprint identification device 1 can be located in the display area of the liquid crystal display 2, the user needs to perform fingerprint unlocking or other fingerprints on the mobile terminal or electronic device using the under-screen fingerprint identification device 1 When verifying, it only needs to press a finger on the fingerprint detection area of the liquid crystal display 2 to realize fingerprint input. Therefore, the display area of the liquid crystal display 2 can be expanded to cover the entire front of the mobile terminal or electronic device, which satisfies Full screen requirements for high screen-to-body ratio.
- the fingerprint recognition module 11 may further include a light path guiding structure 111, which may be arranged above the fingerprint sensor 112; wherein the light path guiding structure 111 is mainly used to press the finger on the fingerprint detection
- the fingerprint detection light generated and transmitted through the liquid crystal display 2 is guided to the optical sensing array of the fingerprint sensor 112 for optical detection;
- the fingerprint identification module 11 may also include a filter layer (not shown in FIG. 1). It can be arranged between the optical path guiding structure 111 and the fingerprint sensor 112, or above the optical path guiding structure 111, to filter out the light signal used to filter out the non-target waveband, and transmit the light signal of the target waveband.
- the target waveband is It is the wavelength band of the fingerprint detection light to prevent the optical signal of the non-target wavelength band from being received by the optical sensor array and affecting the fingerprint recognition effect.
- the filter layer may be coated on the optical sensing array of the fingerprint sensor 112 by an evaporation process to be integrated in the fingerprint sensor 112. In the sensor 112, the thickness of the fingerprint identification module is thereby reduced.
- the fingerprint sensor 112 the optical path guiding structure 111, and the filter layer may be packaged as one component to form the fingerprint identification module 11.
- the light path guiding structure 111 can adopt various implementations.
- the light path guiding structure 111 may be an optical lens layer, which includes one or more lenses, such as a lens group composed of one or more aspheric lenses.
- the optical lens layer can be used to converge the fingerprint detection light formed by reflection or transmission from the finger and passing through the liquid crystal display 2 to the optical sensor array of the fingerprint sensor 112 below it, so that the optical sensor array can perform processing based on the fingerprint detection light.
- Optical imaging is used to obtain the fingerprint image of the finger.
- the optical lens layer may also be formed with a pinhole or aperture stop in the optical path of the one or more lenses, and the pinhole or aperture stop may cooperate with the optical lens layer to expand the under-screen fingerprint identification device 1 Filed of View (FOV) to improve the fingerprint imaging effect of the fingerprint device under the screen.
- FOV Filed of View
- the light path guiding structure 111 may specifically be a collimator (Collimator) layer fabricated on a semiconductor silicon wafer or other substrate, which has a plurality of collimator units, and the collimator unit may be specifically Collimation through hole with a certain aspect ratio; when the user performs fingerprint recognition on the liquid crystal display 2, in the fingerprint detection light formed by the finger above the liquid crystal display 2 and transmitted through the liquid crystal display 2, the incident angle is consistent with the collimation
- the fingerprint detection light with the same extending direction of the unit can pass through the collimation unit and be received by the sensing unit below it, while the fingerprint detection light with an excessively large incident angle is attenuated by multiple reflections inside the collimation unit, so every time
- One sensor unit can basically only receive the fingerprint detection light directly above it, so that the optical sensor array uses the fingerprint detection light detected by each sensor unit to obtain the fingerprint image of the finger.
- the optical path guiding structure 111 may also specifically include a micro-lens (Micro-Lens) layer and an optical film layer.
- a micro-lens Micro-Lens
- Other processes are formed above the optical sensing array of the fingerprint sensor 112, and each microlens may correspond to one or more sensing units of the optical sensing array.
- the optical film layer may be formed between the microlens layer and the optical sensing unit, which may include at least one light blocking layer and formed between the light blocking layer and the microlens layer or between the light blocking layer and the optical sensing array.
- the light blocking layer includes a plurality of micro holes, and a specific optical design is adopted to make the micro holes formed between the corresponding micro lens and the sensing unit, thereby limiting the angle of the receiving light path of the sensing unit.
- the light-blocking layer can block the optical interference between adjacent microlenses, and the microlens converges the received fingerprint light signal into the microhole at a specific vertical or oblique angle and transmits it to the sensor via the microhole.
- Unit for optical fingerprint imaging can block the optical interference between adjacent microlenses, and the microlens converges the received fingerprint light signal into the microhole at a specific vertical or oblique angle and transmits it to the sensor via the microhole.
- the liquid crystal display 2 may also include a transparent protective cover 23, such as a glass cover or a sapphire cover, which is specifically located above the liquid crystal module 21 of the liquid crystal display 2 and covers the liquid crystal module.
- a transparent protective cover 23 such as a glass cover or a sapphire cover
- the so-called finger pressing on the liquid crystal display 2 can actually refer to the transparent protective cover 23 pressed on the liquid crystal module 21 or the protective layer covering the surface of the transparent protective cover 23 (such as Tempered film or other protective film).
- the under-screen fingerprint identification device 1 may further include a detection light source 12, which is used to emit detection light, and the detection light passes through the liquid crystal display 2 and illuminates the finger above the fingerprint identification area. The reflection or transmission forms the fingerprint detection light carrying fingerprint information.
- a detection light source 12 which is used to emit detection light, and the detection light passes through the liquid crystal display 2 and illuminates the finger above the fingerprint identification area. The reflection or transmission forms the fingerprint detection light carrying fingerprint information.
- the under-screen fingerprint recognition device 1 includes a fingerprint recognition module 11, and also includes a detection light source 12, which emits detection light, which can be irradiated through the liquid crystal display 2
- a detection light source 12 which emits detection light, which can be irradiated through the liquid crystal display 2
- the finger above the fingerprint detection area the detection light is irradiated to the finger and reflected or transmitted by the finger to form fingerprint detection light.
- the formed fingerprint detection light is transmitted through the liquid crystal display 2 to the fingerprint recognition module 11 under the backlight module 22, carrying the fingerprint
- the fingerprint detection light of the information forms a fingerprint image on the fingerprint sensor 112, and fingerprint recognition is performed by the fingerprint sensor 112.
- the wavelengths of the detection light and the backlight provided by the backlight module 22 for displaying images may be different.
- the backlight module 22 may include a backlight source (not shown in FIG. 1), the backlight source provides a backlight for illuminating the liquid crystal display 2, and the backlight provided by the backlight module 22 makes the liquid crystal display 2Display the screen.
- the detection light emitted by the detection light source 12 of the under-screen fingerprint identification device 1 and the backlight provided by the backlight module 22 have different wavelengths, so that the mutual influence between the detection light and the backlight can be avoided.
- the emitted backlight can be used to illuminate the screen to ensure the brightness of the liquid crystal display 2; and the detection light emitted by the detection light source 12 is mainly used to illuminate the finger above the fingerprint detection area, so that the finger is directed to the fingerprint recognition module 11 reflects or transmits enough light, so as to ensure that the fingerprint sensor 112 obtains a fingerprint image with better clarity.
- the detection light source 12 can be arranged side by side with the liquid crystal module under the transparent protective cover 23, and located at the edge area under the transparent protective cover 23, in order to prevent the user from seeing the detection provided below through the transparent protective cover 23
- a light-shielding layer 231 can be provided on the transparent protective cover 23 above the detection light source 12.
- the light-shielding layer can transmit the detection light emitted by the detection light source 12.
- the light-shielding layer 231 can be an ink layer.
- the layer can transmit infrared light.
- the detection light may be infrared light
- the backlight provided by the backlight module 22 may be visible light.
- the under-screen fingerprint recognition device 1 may use a non-visible light source with a specific wavelength as the fingerprint excitation light source to realize optical fingerprint recognition.
- the detection light emitted by the detection light source 12 may be infrared light, that is, the detection light source 12 is infrared.
- the light source for example, the infrared light source may be an infrared LED light source, an infrared vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL for short), or an infrared laser diode (Laser Diode).
- the infrared light emitted by the detection light source 12 can be irradiated to the finger above the fingerprint detection area of the liquid crystal display 2 through the liquid crystal module 21 or the transparent protective cover 23, and the infrared light can be emitted on the surface of the finger or transmitted from the surface of the finger to form infrared Fingerprint detection light.
- the infrared fingerprint detection light carries fingerprint information of the finger, which can pass through the liquid crystal module 21 and the backlight module 22 of the liquid crystal display 2 and be transmitted to the fingerprint recognition module 11 under the backlight module 22.
- the fingerprint identification module 11 guides the fingerprint detection light to the optical sensor array of the fingerprint sensor 112 through the optical path guiding structure 111.
- the optical sensor array can receive the fingerprint detection light and further obtain fingerprint information of the finger according to the fingerprint detection light.
- the backlight provided by the backlight source in the backlight module 22 can be visible light.
- the visible light illuminates the liquid crystal display 2 so that the liquid crystal display 2 displays images; in this way, the detection light source 12 of the fingerprint identification device 1 under the screen is infrared light.
- all the visible light emitted by the backlight source is used to illuminate the liquid crystal display screen 2, and the infrared light emitted by the detection light source 12 is all used to illuminate the finger to form Fingerprint detection light.
- the backlight module 22 sequentially includes a brightness enhancement film 221, a diffusion film 22, a light guide plate 223, a reflective film 224, and a back plate 225 from top to bottom.
- the back plate includes a through hole 2251 to reflect or transmit through the finger.
- the fingerprint identification module 11 can be specifically arranged under the through hole 2251.
- each layer of optical The film materials have different degrees of recession to the through holes of the back plate 225, which will also lead to the formation of uneven air gaps between the various layers of optical film materials, resulting in film interference. See Figure 2 and Figure 3 for details.
- Figure 2 is a schematic diagram of the air gap generated when two adjacent layers of optical film materials are laminated.
- FIG. 4 shows an embodiment of the backlight module of the present application.
- the backlight module 22 may include a diffuser film 222 and a light guide plate 223 adjacently disposed under the diffuser film 222.
- the surface of the diffuser film 222 facing the light guide plate 223 has a plurality of
- the first microstructures 2221 are arranged at intervals.
- the first microstructures 2221 are randomly distributed on the lower surface of the diffusion film 222, and are used to increase the distance between the diffusion film 222 and the light guide plate 223 to prevent the fingerprint detection light from being transmitted and diffused.
- a film interference phenomenon occurs between the film 222 and the light guide plate 223.
- the light guide grooves of the general light guide plate are designed to be arranged regularly and have a fixed arrangement period, for example, the light guide plate 223 in FIG. 4 is provided with a light guide groove 2231.
- the light guide plate 223 in this embodiment will be described in detail later describe.
- the first microstructures 2221 present a random distribution on the lower surface of the diffusion film 222, or when it can be called irregular arrangement or distribution, it can effectively avoid the diffusion film 222.
- the first microstructure 2221 on the surface and the light guide groove 2231 form moiré fringes, so as to prevent the moiré fringe from affecting fingerprint imaging.
- the first microstructures 2221 randomly distributed on the lower surface of the diffusion film 222 can not only solve the problem of film interference between the diffusion film 222 and the light guide plate 223, but also avoid the formation of moiré fringes between the first microstructure 2221 and the light guide groove 2231 , which can improve the effect of fingerprint imaging and recognition.
- the shape and size of the first microstructure 2221 are not limited, and can be set according to actual conditions.
- the first microstructure 2221 may be a convex structure formed on the lower surface of the diffusion film 222.
- the height of a microstructure 2221 can range from 1 micrometer to 10 micrometers.
- the size of the first microstructure 2221 in the horizontal direction is less than 10 micrometers, or the width of the first microstructure 2221 in the horizontal direction is less than 10 micrometers. .
- FIG. 5 is a front view of the bottom surface of a diffusion film 222 in the backlight module 22 of FIG. 4, and it can be seen that the first microstructures 2221 are randomly distributed on the bottom surface of the diffusion film.
- the backlight module 22 may also include a reflective film 224, the reflective film 224 is adjacently arranged below the light guide plate 223, the reflective film 224 is used to reflect all the light emitted by the backlight to the light guide plate 223, so that the light guide plate 223
- the light plate 223 emits all light from its front surface
- the front surface of the light guide plate 223 is the surface where the light guide groove 2231 is located.
- the surface of the reflective film 224 facing the light guide plate 223 has a plurality of second microstructures 2241 arranged at intervals.
- the second microstructures 2241 are randomly distributed on the upper surface of the reflective film 224 and are used to increase the distance between the reflective film 224 and the light guide plate 223. The spacing between.
- the second microstructure 2224 presents a random distribution on the upper surface of the reflective film 224, or when it can be called irregular arrangement or distribution, it can not only solve the problem of thin film between the reflective film 224 and the light guide plate 223
- the problem of interference can also prevent the formation of moiré fringes between the second microstructure 2241 and the light guide groove 2231, thereby improving the effect of fingerprint imaging and recognition.
- the shape and size of the second microstructure 2241 are not limited, and can be set according to actual conditions.
- the second microstructure 2241 may be a convex structure formed on the upper surface of the reflective film 224.
- the height of the second microstructure 2241 can range from 1 micrometer to 10 micrometers.
- the size of the second microstructure 2241 in the horizontal direction is less than 10 micrometers, or the width of the second microstructure 2241 in the horizontal direction is less than 10 micrometers.
- Figure 4 also shows the position of the fingerprint identification module 11 of the under-screen fingerprint identification device 1 relative to the backlight module 22.
- the fingerprint identification module 11 is arranged below the backlight module 22.
- FIG. 6 is a specific embodiment of the light guide plate 223 in FIG. 4. 6, in a possible implementation manner, the light guide plate 223 includes a base material 2232, the upper surface of the base material 2232 is provided with a plurality of raised light guide grooves 2231, the light guide grooves 2231 along the first direction of the light guide plate 223 Extend and are arranged at even intervals along the second direction of the light guide plate 223, and the arrangement period of the light guide grooves 2231 along the second direction is T1.
- the first direction is parallel to the long side of the light guide plate 223, and the second direction is parallel to the short side of the light guide plate 223, or the first direction is parallel to the short side of the light guide plate 223.
- the two directions are parallel to the long side of the light guide plate 223.
- the light guide groove 2231 can enhance the light guide function of the light guide plate 223, so that the backlight emitted by the backlight source located on one side of the light guide plate 223 is better transmitted to the other side of the light guide plate 223, so that the light guide plate 223
- the surface light source emitted from the front of the light plate 223 has a relatively uniform brightness.
- the plurality of light guide grooves 2231 and the first microstructure 2221 of the diffusion film 222 are jointly supported between the diffusion film 222 and the light guide plate 223, which can further increase the distance between the diffusion film 222 and the light guide plate 223, and effectively solve the diffusion problem.
- the cross section of the light guide groove 2231 along the second direction may be arcuate.
- the arcuate light guide groove 2231 has a certain light-gathering function. While enhancing the light guide of the light guide plate 223, the provision of the light guide groove 2231 can also increase the brightness of the light emitted from the light guide plate 223 to enhance the liquid crystal The display effect of the display screen 2.
- the height of the light guide groove 2231 can range from 1 micron to 3 micrometers.
- the height of the light guide groove 2231 can be 1.5 micrometers, 1.75 micrometers, 1.8 micrometers, 2 micrometers, 2.5 micrometers, etc.
- the height of the light guide groove 2231 may be 1.75 ⁇ m.
- the radius of curvature of the arc corresponding to the arc can range from 30 microns to 150 microns.
- the radius of curvature of the arc can be 30 microns, 40 microns, 50 microns or 70 microns, etc., preferably, so
- the radius of curvature of the arc or light guide groove 2231 may be 40 microns.
- the light guide groove 2231 forms a relatively smooth arcuate columnar structure on the surface of the light guide plate 223.
- the light guide groove 2231 can improve the light guide effect of the light guide plate 223.
- the light guide groove 2231 is in contact with the first microstructure 2221 of the diffusion film 222. When the stability is better.
- the difference between the multiple first microstructures 2221 and the different light guide grooves 2231 is different.
- the position contact makes the gap between the diffusion film 222 and the light guide plate 223 more uniform overall.
- the distance between the diffusion film 222 and the light guide plate 223 is jointly determined by the first microstructure 2221 and the light guide groove 2231, which can not only avoid The problem of thin-film interference between the diffusion film 222 and the light guide plate 223 can also avoid the formation of moiré fringes between the first microstructure 2221 and the light guide groove 2231, thereby improving the effect of fingerprint imaging.
- the liquid crystal module of the liquid crystal display screen includes liquid crystal pixels arranged in an array, and the light guide grooves 2231 can be arranged at even intervals along the second direction, that is, regularly arranged in a certain period. Therefore, if the arrangement period of the light guide groove 2231 is set improperly, moire fringes will be generated between the liquid crystal pixels, which will cause moiré fringes to appear on the liquid crystal display, which will interfere with the display, thereby affecting the display effect and further affecting the fingerprint imaging. Referring to FIGS. 7a-7c and FIG. 1, as shown in FIGS.
- the liquid crystal display 2 may also include a liquid crystal module 21 disposed above the backlight module 22, and the liquid crystal module 21 includes an array
- the distributed liquid crystal pixels 2111 are used to display images.
- the liquid crystal pixel 2111 may include a plurality of sub-pixels 2111a.
- the liquid crystal pixel 2111 includes three sub-pixels 2111a.
- the three sub-pixels 2111a may be sub-pixels of different colors.
- the three sub-pixels 2111a are red sub-pixels. , Green sub-pixel and blue sub-pixel.
- the shapes and sizes of the three sub-pixels 2111a in the liquid crystal pixel 2111 are all the same, as shown in FIG.
- the arrangement period of the second direction of the group 21 is T2. It can be understood that the second direction of the light guide plate 223 is the same as the second direction of the liquid crystal module 211.
- the cloth cycle is marked with respect to the liquid crystal module 21.
- the arrangement period of the light guide groove 2231 in the second direction is T1, and T1>T2, that is, the arrangement period T1 of the light guide groove 2231 in the second direction is greater than the arrangement period of the sub-pixel 2111a in the second direction, so as to avoid the light guide groove 2231
- the arrangement period overlaps with the sub-pixel 2111a to generate moiré fringes, which affects the display effect of the liquid crystal display 2 and further affects the effect of fingerprint imaging and recognition.
- T1-T2 ⁇ 60 microns. At this time, there is almost no moiré between the light guide groove 2231 and the sub-pixel 2111a, and the display effect of the liquid crystal display 2 will not be affected.
- the shapes and sizes of the three sub-pixels 2111a in the liquid crystal pixel 2111 may be different.
- the shapes or sizes of at least two of the three sub-pixels 2111a are different.
- the shapes of the three sub-pixels 2111a are different, or the sizes of the three sub-pixels 2111a are different; for another example, among the three sub-pixels 2111a, two of the sub-pixels have different shapes, or two of the sub-pixels have different sizes. .
- two sub-pixels 2111a have different shapes.
- One of the sub-pixels 2111a has a rectangular shape
- the other two sub-pixels 2111a have a trapezoidal shape
- the rectangular sub-pixel 2111a is located in the shape of The middle of the two trapezoidal sub-pixels 2111a.
- the shape and size of the sub-pixel 2111a in FIGS. 7a and 7b are only illustrative.
- the shape of the sub-pixel 2111a may also be other shapes, which are not limited in this embodiment and can be set according to actual requirements.
- the arrangement period of the liquid crystal pixels 2111 along the second direction of the liquid crystal module 21 is T3.
- the second direction of the light guide plate 223 and the liquid crystal mold The second direction of the group 211 is the same.
- the arrangement period of the light guide groove 2231 in the second direction is T1, and T1>T3, that is, the arrangement period T1 of the light guide groove 2231 in the second direction is greater than the arrangement period of the liquid crystal pixels 2111 in the second direction, so as to avoid the light guide groove 2231
- the arrangement period overlaps with the liquid crystal pixel 2111 to produce moiré fringes, which affects the display effect of the liquid crystal display 2 and further affects the effect of fingerprint imaging and recognition.
- T1-T3 ⁇ 60 microns.
- the lower surface of the light guide plate 223 includes a plurality of light guide particles 2233 spaced apart.
- the bottom surface of the substrate 2232 is provided with a plurality of light guide particles spaced apart. 2233.
- the light guide particles 2233 will diffuse the reflected light to various angles, and then destroy the reflection conditions.
- the light guide plate 223 is emitted from the front side, that is, the light guide groove 2231 is located. .
- the light guide particles 2233 at different positions can make the light guide plate 223 emit light uniformly.
- the light guide particles 2233 are supported between the light guide plate 223 and the reflective film 224, which can further increase the distance between the light guide plate 223 and the reflective film 224, by setting a reasonable size for the light guide particles 2233
- the size, the gap between the light guide plate 223 and the reflective film 224 can be controlled within a reasonable range, so as to eliminate the film interference phenomenon between the light guide plate 223 and the reflective film 224.
- the embodiment of the present application does not limit the size of the light guide particles 2233, and can be set according to actual conditions.
- the height of the light guide particles 2233 can range from 3 microns to 5 microns, for example
- the height of the light guide particles 2233 can be 3 microns, 3.5 microns, 4 microns, 4.5 microns or 5 microns.
- the height of the light guide particles 2233 can be 4 microns.
- the light guide groove 2231 and the light guide particles 2233 can be made of the same material as the substrate 2232, and the light guide groove 2231 and the light guide particles 2233 can be formed on the two surfaces of the substrate 2232 by etching or the like, so that the guide The light groove 2231, the base material 2232 and the light guide particles 2233 are integrally formed.
- the density of the light guide particles 2233 in different regions on the lower surface of the light guide plate 223 may be different.
- the light guide particles 2233 may be distributed on the lower surface of the light guide plate 223 in a non-uniform manner.
- the density of the light guide particles 2233 in the area closer to the backlight on the light guide plate 223 can be less than that of the backlight.
- the density of the light guide particles 2233 in the remote area is such that by disposing light guide particles 2233 of different densities in unused areas, each area of the light guide plate 223 has a relatively uniform light intensity.
- the backlight module 22 may further include a brightness enhancement film 221 disposed adjacently above the diffusion film 222, and the surface of the brightness enhancement film 221 facing the diffusion film 222 has a plurality of spaced apart
- the third microstructures 2211 are randomly distributed on the lower surface of the brightness enhancement film 221 and are used to increase the distance between the brightness enhancement film 221 and the diffusion film 222.
- the brightness enhancement film 221 is used to enhance the brightness of light.
- the light is homogenized by the diffusion film 222 and then directed to the brightness enhancement film 221.
- the brightness enhancement film 221 can further increase the brightness of the light to improve the brightness of the liquid crystal display 2.
- the third microstructure 2211 is supported between the brightness enhancement film 221 and the diffusion film 222 to increase the gap between the brightness enhancement film 221 and the diffusion film 222 to prevent fingerprint detection light from passing between the brightness enhancement film 221 and the diffusion film 222 Film interference phenomenon occurs.
- the third microstructure 2211 presents a random distribution on the lower surface of the brightness enhancement film 221, or when it can be called irregular arrangement or distribution, it can also avoid the third microstructure 2211 and the light guide groove 2231. Moiré fringes are formed between them, which can enhance the fingerprint imaging effect.
- the third microstructure 2211 may be a microsphere structure embedded in the lower surface of the brightness enhancement film 221, and the diameter of the third microstructure 2211 ranges from 4 microns to 10 microns.
- the third microstructure 2211 By configuring the third microstructure 2211 as a microsphere structure, the brightness of the light can be further enhanced, and the brightness of the liquid crystal display screen 2 can be improved.
- the third microstructure 2211 is partially embedded in the lower surface of the brightness enhancement film 221, the height of the third microstructure 2211 exposed on the lower surface of the brightness enhancement film 221 can still ensure that there will be no generation between the brightness enhancement film 221 and the diffusion film 222. Film interference phenomenon.
- the diameter of the third microstructure 2211 may be 4 micrometers, 5 micrometers, 6 micrometers, 7 micrometers or 8 micrometers, etc.
- the diameter of the third microstructure 2211 may be 5 micrometers.
- the upper surface of the brightness enhancement film 221 may have a plurality of fourth microstructures 2212 arranged at intervals, and the fourth microstructures 2212 are randomly distributed on the upper surface of the brightness enhancement film 221.
- the liquid crystal display 2 may also include a liquid crystal module 21 located above the backlight module 22, and the brightness enhancement film 221 is located on the uppermost layer of the backlight module 22, so the fourth microstructure 2212 is supported on the brightness enhancement film 221 And the liquid crystal module 21 to increase the distance between the brightness enhancement film 221 and the liquid crystal module 21 to avoid the phenomenon of thin film interference when the fingerprint detection light passes between the brightness enhancement film 221 and the liquid crystal module 21, not only that,
- the fourth microstructure 2212 presents a random distribution on the upper surface of the brightness enhancement film 221, or can be called irregular arrangement or distribution, it can also avoid the formation of moire fringes between the fourth microstructure 2212 and the light guide groove 2231, and thus can Improve fingerprint imaging effect.
- the fourth microstructure 2212 may be a microsphere structure embedded in the upper surface of the brightness enhancement film 221, and the diameter of the fourth microstructure 2212 ranges from 4 microns to 20 microns.
- the height of the fourth microstructure 2212 exposed on the upper surface of the brightness enhancement film 221 can still ensure that there is no gap between the brightness enhancement film 221 and the liquid crystal module 21. Produce film interference phenomenon.
- the diameter of the fourth microstructure 2212 may be 4 micrometers, 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, 10 micrometers, 11 micrometers, 12 micrometers, or 13 micrometers, etc., preferably, the fourth micrometer The diameter of structure 2212 may be 10 microns.
- the under-screen fingerprint identification device provided in this embodiment is suitable for electronic equipment with a liquid crystal display, and the fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display;
- the lower fingerprint recognition device includes a fingerprint recognition module.
- the fingerprint recognition module is located under the backlight module of the liquid crystal display.
- the fingerprint detection light reflected or transmitted by the finger above the fingerprint detection area is transmitted to the fingerprint sensor through the liquid crystal display. , Receive and recognize fingerprint images through the fingerprint sensor.
- the backlight module includes a laminated diffusion film and a light guide plate, the light guide plate is located under the diffusion film, by arranging a plurality of first microstructures distributed at intervals on the surface of the diffusion film facing the light guide plate.
- the microstructure is supported between the diffuser film and the light guide plate, which can increase the distance between the diffuser film and the light guide plate, thereby increasing the air gap between the diffuser film and the light guide plate, and make the air gap of each part more Even, it can avoid the film interference phenomenon when the fingerprint detection light passes through the diffusion film and the light guide plate, and can eliminate the interference of the "Newton ring" caused by the film interference phenomenon on the fingerprint imaging, and ensure the fingerprint imaging effect to make the fingerprint The sensor obtains a clear fingerprint image.
- this embodiment provides a liquid crystal display screen 2 that supports an under-screen fingerprint recognition function.
- the under-screen fingerprint recognition device 1 described in the first embodiment is arranged under the liquid crystal display screen 2, and the liquid crystal display
- the display screen 2 includes a liquid crystal module 21 and a backlight module 22.
- the backlight module 22 is located under the liquid crystal module 21 and is used to provide backlight for the liquid crystal module 21 and transmit the fingerprint detection light formed by the finger above the liquid crystal display 2 To the fingerprint sensor 112 under the backlight module 22.
- the under-screen fingerprint recognition device 1 includes a detection light source 12 and a fingerprint recognition module 11.
- the detection light source 12 is used to emit detection light to the finger above the fingerprint detection area.
- the detection light illuminates the finger above the fingerprint detection area and is reflected by the finger.
- the fingerprint detection light carrying fingerprint information is formed after transmission or transmission, and the fingerprint identification module 11 is used to receive the fingerprint detection light carrying the fingerprint information through the liquid crystal display 2 to obtain the fingerprint image of the finger.
- the liquid crystal display includes a display module and a backlight module located under the display module.
- the backlight module includes a laminated diffusion film and a light guide plate, the light guide plate is located under the diffusion film, by arranging a plurality of first microstructures distributed at intervals on the surface of the diffusion film facing the light guide plate. The microstructure is supported between the diffusion film and the light guide plate.
- the first microstructure can increase the distance between the diffusion film and the light guide plate, thereby increasing the air gap between the diffusion film and the light guide plate, and make the The air gap is more uniform, which can avoid the film interference phenomenon when the fingerprint detection light passes through the diffusion film and the light guide plate, and can eliminate the interference of the interference light generated by the film interference phenomenon on the fingerprint imaging, and ensure the fingerprint imaging effect. Make the fingerprint sensor get a clear fingerprint image.
- the embodiment of the present application also provides an electronic device, which may include the liquid crystal display 2 in the third embodiment and the under-screen fingerprint identification device in the second embodiment, wherein the liquid crystal display 2 may include the backlight module 22 in the first embodiment And the liquid crystal module 21, in which the backlight module 22 is located below the liquid crystal module 21, which will not be repeated here.
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Abstract
The present application provides an under-screen fingerprint identification apparatus, a backlight module, a liquid crystal display screen, and an electronic device. The under-screen fingerprint identification apparatus is suitable for an electronic device having a liquid crystal display screen. The apparatus comprises a fingerprint identification module positioned below a backlight module of the liquid crystal display screen; the backlight module comprises a diffusion film, a light guide plate, and a reflective film; the light guide plate is adjacently arranged below the diffusion film; the surface, facing the light guide plate, of the diffusion film is provided with a plurality of first microstructures arranged at intervals; the first microstructures are randomly distributed on the lower surface of the diffusion film and used for increasing the distance between the diffusion film and the light guide plate; the reflective film is adjacently arranged below the light guide plate; the surface, facing the light guide plate, of the reflective film is provided with a plurality of second microstructures arranged at intervals; the second microstructures are randomly distributed on the upper surface of the reflective film and used for increasing the distance between the reflective film and the light guide plate. The under-screen fingerprint identification apparatus of the present application can relieve or eliminate a thin film interference phenomenon generated by a backlight module, and a fingerprint imaging effect is ensured.
Description
本申请涉及指纹识别技术领域,尤其涉及一种屏下指纹识别装置、背光模组、液晶显示屏和电子设备。This application relates to the field of fingerprint identification technology, and in particular to an under-screen fingerprint identification device, a backlight module, a liquid crystal display and electronic equipment.
指纹识别解锁已经成为大部分手机、平板电脑等移动终端都配备的基础功能。随着用户对于移动终端全面屏的追求,屏下指纹识别技术的应用越来越广泛,其中以屏下光学指纹识别技术最为普及。目前市面上具有屏下光学指纹识别功能的移动终端均采用有机发光二极管(Organic Light-Emitting Diode,OLED)显示屏,但OLED显示屏的成本较高,因此采用液晶显示(Liquid Crystal Display,LCD)屏的屏下光学指纹识别技术正在逐步向商用化推进。Fingerprint recognition and unlocking has become a basic function that most mobile terminals such as mobile phones and tablet computers are equipped with. With the pursuit of full screens of mobile terminals by users, the application of under-screen fingerprint recognition technology has become more and more widespread, among which under-screen optical fingerprint recognition technology is the most popular. At present, mobile terminals with under-screen optical fingerprint recognition on the market all use Organic Light-Emitting Diode (OLED) displays, but the cost of OLED displays is relatively high, so liquid crystal displays (LCD) are used. The under-screen optical fingerprint recognition technology is gradually advancing towards commercialization.
然而,当LCD显示屏的背光模组中的各层光学膜材贴合在一起时,由于各层光学膜材的厚度均较薄且为柔性材质,容易产生形变,因而相邻两层膜材之间会形成不均匀的空气间隙导致光线在各层光学膜材之间传播时出现光程差,满足光学上形成薄膜干涉的条件,产生薄膜干涉现象,即出现“牛顿环”,这种现象会对指纹成像效果造成严重干扰。However, when the various layers of optical films in the backlight module of the LCD display are bonded together, since the thickness of each layer of optical films is thin and flexible, it is easy to deform, so two adjacent layers of film materials are adjacent to each other. There will be an uneven air gap between them, which will cause the optical path difference to occur when the light propagates between the various layers of optical film materials, which meets the conditions for the formation of thin-film interference on the optics, resulting in the phenomenon of thin-film interference, that is, "Newton's ring", this phenomenon It will cause serious interference to the fingerprint imaging effect.
发明内容Summary of the invention
本申请提供一种屏下指纹识别装置、背光模组、液晶显示屏和电子设备,能够缓解或消除背光模组产生的薄膜干涉现象,保证指纹成像效果。This application provides an under-screen fingerprint identification device, a backlight module, a liquid crystal display and electronic equipment, which can alleviate or eliminate the film interference phenomenon generated by the backlight module and ensure the fingerprint imaging effect.
第一方面,本申请提供一种屏下指纹识别装置,适用于具有液晶显示屏的电子设备,所述屏下指纹识别装置的指纹检测区域至少部分位于所述液晶显示屏的显示区域;In the first aspect, the present application provides an under-screen fingerprint identification device, which is suitable for electronic equipment with a liquid crystal display, and the fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display;
所述屏下指纹识别装置包括位于所述液晶显示屏的背光模组下方的指纹识别模组,所述指纹识别模组用于接收经所述指纹检测区域上方的手指反射或透射形成的并透过所述液晶显示屏的指纹检测光,以获取所述手指的指纹 图像;The under-screen fingerprint identification device includes a fingerprint identification module located below the backlight module of the liquid crystal display, and the fingerprint identification module is used to receive the fingerprint identification module formed by the reflection or transmission of the finger above the fingerprint detection area. Pass the fingerprint detection light of the liquid crystal display to obtain the fingerprint image of the finger;
其中,所述背光模组包括扩散膜、导光板和反射膜,所述导光板相邻设置在所述扩散膜的下方,所述扩散膜面向所述导光板的表面具有多个间隔设置的第一微结构,所述第一微结构在所述扩散膜的下表面随机分布,并用于增大所述扩散膜和所述导光板之间的间距,所述反射膜相邻设置在所述导光板的下方,所述反射膜面向所述导光板的表面具有多个间隔设置的第二微结构,所述第二微结构在所述反射膜的上表面随机分布,并用于增大所述反射膜和所述导光板之间的间距,不仅能够避免所述扩散膜和所述导光板之间,以及所述导光板与所述反射膜之间产生薄膜干涉,还能够避免所述第一微结构或所述第二微结构与所述导光板的导光槽之间形成摩尔条纹,因而能够提升指纹成像效果,以使屏下指纹识别装置获得清晰的指纹图像。Wherein, the backlight module includes a diffuser film, a light guide plate and a reflective film, the light guide plate is arranged adjacently below the diffuser film, and the surface of the diffuser film facing the light guide plate has a plurality of spaced first A microstructure, the first microstructure is randomly distributed on the lower surface of the diffusion film and used to increase the distance between the diffusion film and the light guide plate, and the reflective film is adjacently arranged on the guide plate Below the light plate, the surface of the reflective film facing the light guide plate has a plurality of second microstructures arranged at intervals, and the second microstructures are randomly distributed on the upper surface of the reflective film and used to increase the reflection The distance between the film and the light guide plate can not only avoid film interference between the diffusion film and the light guide plate, and between the light guide plate and the reflective film, but also can avoid the first micro Moire fringes are formed between the structure or the second microstructure and the light guide groove of the light guide plate, so that the fingerprint imaging effect can be improved, so that the under-screen fingerprint identification device can obtain a clear fingerprint image.
第二方面,本申请提供一种背光模组,适用于支持屏下指纹识别功能的液晶显示屏,背光模组包括扩散膜、导光板和反射膜,所述导光板相邻设置在所述扩散膜的下方,所述扩散膜面向所述导光板的表面具有多个间隔设置的第一微结构,所述第一微结构在所述扩散膜的下表面随机分布,并用于增大所述扩散膜和所述导光板之间的间距,所述反射膜相邻设置在所述导光板的下方,所述反射膜面向所述导光板的表面具有多个间隔设置的第二微结构,所述第二微结构在所述反射膜的上表面随机分布,并用于增大所述反射膜和所述导光板之间的间距,不仅能够避免所述扩散膜和所述导光板之间,以及所述导光板与所述反射膜之间产生薄膜干涉,还能够避免所述第一微结构或所述第二微结构与所述导光板的导光槽之间形成摩尔条纹,提升指纹成像效果,以使屏下指纹识别装置获得清晰的指纹图像。In the second aspect, the present application provides a backlight module suitable for a liquid crystal display that supports under-screen fingerprint recognition. The backlight module includes a diffuser film, a light guide plate, and a reflective film. The light guide plate is adjacently arranged on the diffuser Below the film, the surface of the diffusion film facing the light guide plate has a plurality of first microstructures arranged at intervals, and the first microstructures are randomly distributed on the lower surface of the diffusion film and used to increase the diffusion The distance between the film and the light guide plate, the reflective film is adjacently arranged below the light guide plate, the surface of the reflective film facing the light guide plate has a plurality of second microstructures arranged at intervals, the The second microstructures are randomly distributed on the upper surface of the reflective film and are used to increase the distance between the reflective film and the light guide plate, which can not only prevent the diffusion film and the light guide plate, but also Thin film interference occurs between the light guide plate and the reflective film, which can also prevent the formation of moiré fringes between the first microstructure or the second microstructure and the light guide groove of the light guide plate, and improve the fingerprint imaging effect. In order to make the fingerprint identification device under the screen obtain a clear fingerprint image.
第三方面,本申请提供一种支持屏下指纹识别功能的液晶显示屏,液晶显示屏的下方设置上述第一方面所述的屏下指纹识别装置,液晶显示屏包括液晶模组和上述第二方面所述的背光模组,背光模组位于液晶模组下方,用于为液晶模组提供背光,并将液晶显示屏上方的手指反射或透射形成的指纹检测光传输至背光模组下方的所述屏下指纹识别装置。In a third aspect, the present application provides a liquid crystal display that supports an under-screen fingerprint identification function. The under-screen fingerprint identification device described in the first aspect is arranged below the liquid crystal display, and the liquid crystal display includes a liquid crystal module and the second In the backlight module described in the aspect, the backlight module is located under the liquid crystal module, and is used to provide backlight for the liquid crystal module, and transmits the fingerprint detection light formed by the reflection or transmission of the finger above the liquid crystal display to all under the backlight module. Describes the fingerprint recognition device under the screen.
第四方面,本申请提供一种电子设备,可以包括第三方面所述的液晶显示屏和第一方面所述的屏下指纹识别装,所述液晶显示屏包括液晶模组和第二方面所述的背光模组,其中,所述背光模组位于所述液晶模组的下方。In a fourth aspect, the present application provides an electronic device, which may include the liquid crystal display screen described in the third aspect and the under-screen fingerprint identification device described in the first aspect. The liquid crystal display screen includes a liquid crystal module and the liquid crystal display device described in the second aspect. The backlight module, wherein the backlight module is located below the liquid crystal module.
为了更清楚地说明本申请实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作一简单介绍,显而易见地,下面描述中的附图是本申请的一些实施例。对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are Some examples of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.
图1为一种屏下指纹识别装置在具有显示屏的电子设备中的结构示意图;Figure 1 is a schematic diagram of the structure of an under-screen fingerprint identification device in an electronic device with a display screen;
图2为背光模组的两层光学膜材之间贴合间隙的示意图;2 is a schematic diagram of the bonding gap between two layers of optical film materials of the backlight module;
图3为图2的背光模组的两层光学膜材之间产生的薄膜干涉图样;3 is a thin film interference pattern generated between two optical films of the backlight module of FIG. 2;
图4为本申请实施例一提供的一种背光模组的结构示意图;4 is a schematic structural diagram of a backlight module provided by Embodiment 1 of the application;
图5为本申请实施例一提供的扩散膜的仰视图;Fig. 5 is a bottom view of the diffusion film provided in the first embodiment of the application;
图6为本申请实施例一提供的导光板的结构示意图;6 is a schematic diagram of the structure of the light guide plate provided in Embodiment 1 of the application;
图7a至7c为本申请实施例一提供的液晶模组的示意图;7a to 7c are schematic diagrams of the liquid crystal module provided in Embodiment 1 of the application;
图8为本申请实施例一提供的另一种背光模组的示意图。FIG. 8 is a schematic diagram of another backlight module provided in Embodiment 1 of the application.
为使本申请实施例的目的、技术方案和优点更加清楚,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.
本申请实施例的技术方案可以应用于各种电子设备。The technical solutions of the embodiments of the present application can be applied to various electronic devices.
例如,智能手机、笔记本电脑、平板电脑、游戏设备等便携式或移动计算设备,以及电子数据库、汽车、银行自动柜员机(Automated Teller Machine,ATM)等其他电子设备。但本申请实施例对此并不限定。For example, portable or mobile computing devices such as smartphones, notebook computers, tablet computers, and gaming devices, as well as other electronic devices such as electronic databases, automobiles, and bank automated teller machines (ATM). However, the embodiment of the present application does not limit this.
本申请实施例的技术方案可以用于生物特征识别技术。其中,生物特征识别技术包括但不限于指纹识别、掌纹识别、虹膜识别、人脸识别以及活体识别等识别技术。为了便于说明,下文以指纹识别技术为例进行说明。The technical solutions of the embodiments of the present application can be used in biometric identification technology. Among them, biometric recognition technologies include, but are not limited to, fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition. For ease of description, the following uses fingerprint recognition technology as an example for description.
本申请实施例的技术方案可以用于屏下指纹识别技术。屏下指纹识别技术是指将指纹识别模组安装在显示屏下方,从而实现在显示屏的显示区域内 进行指纹识别操作,不需要在电子设备正面除显示区域外的区域设置指纹采集区域。具体地,指纹识别模组使用从电子设备的显示组件的顶面返回的光来进行指纹感应和其他感应操作。这种返回的光携带与显示组件的顶面接触的物体(例如手指)的信息,位于显示组件下方的指纹识别模组通过采集和检测这种返回的光以实现屏下指纹识别。The technical solutions of the embodiments of the present application can be used in the under-screen fingerprint identification technology. Under-screen fingerprint recognition technology means that the fingerprint recognition module is installed below the display screen, so that fingerprint recognition operations can be performed in the display area of the display screen, without the need to set a fingerprint collection area on the front of the electronic device except for the display area. Specifically, the fingerprint identification module uses light returned from the top surface of the display assembly of the electronic device to perform fingerprint sensing and other sensing operations. This returned light carries information about objects (for example, fingers) in contact with the top surface of the display assembly, and the fingerprint recognition module located below the display assembly collects and detects this returned light to realize fingerprint recognition under the screen.
实施例一Example one
图1为一种屏下指纹识别装置在具有显示屏的电子设备中的结构示意图;图2为背光模组的两层光学膜材之间贴合间隙的示意图;图3为图2的背光模组的两层光学膜材之间产生的薄膜干涉图样;图4为本申请实施例一提供的背光模组的结构示意图;图5为本申请实施例一提供的扩散膜的仰视图;图6为本申请实施例一提供的导光板的结构示意图;图7a-图7c为本申请实施例一提供的液晶模组的示意图;图8为本申请实施例一提供的另一种背光模组的示意图。本申请实施例中,为了简化描述,相同的部件可以采用相同的附图标记。Figure 1 is a schematic diagram of the structure of an under-screen fingerprint identification device in an electronic device with a display screen; Figure 2 is a schematic diagram of the bonding gap between the two layers of optical films of the backlight module; Figure 3 is the backlight module of Figure 2 The film interference pattern generated between the two optical film materials in the group; FIG. 4 is a schematic structural diagram of the backlight module provided in the first embodiment of the application; FIG. 5 is a bottom view of the diffusion film provided in the first embodiment of the application; FIG. 6 Fig. 7a-7c are schematic diagrams of the liquid crystal module provided in the embodiment 1 of this application; Fig. 8 is a schematic diagram of another backlight module provided in the embodiment 1 of this application Schematic. In the embodiments of the present application, in order to simplify the description, the same components may use the same reference numerals.
如图1所示,本实施例提供一种屏下指纹识别装置1,适用于具有液晶显示屏2的电子设备,屏下指纹识别装置1的指纹检测区域至少部分位于液晶显示屏2的显示区域。具体的,本实施例提供的屏下指纹识别装置1可以适用于液晶显示屏2,该屏下指纹识别装置1为屏下光学指纹识别装置,可以应用在智能手机、平板电脑以及其它采用液晶显示屏2的移动终端或者电子设备上。As shown in FIG. 1, this embodiment provides an under-screen fingerprint identification device 1, which is suitable for electronic equipment with a liquid crystal display 2. The fingerprint detection area of the under-screen fingerprint identification device 1 is at least partially located in the display area of the liquid crystal display 2. . Specifically, the under-screen fingerprint identification device 1 provided in this embodiment can be applied to the liquid crystal display screen 2. The under-screen fingerprint identification device 1 is an under-screen optical fingerprint identification device, which can be applied to smart phones, tablet computers, and other liquid crystal displays. Screen 2 on the mobile terminal or electronic device.
更具体的,在上述移动终端或电子设备中,该屏下指纹识别装置1可以设置在液晶显示屏2下方的局部区域,并与液晶显示屏2配合形成屏下指纹识别系统。其中,该屏下指纹识别装置1的指纹检测区域可以具体位于液晶显示屏2的至少部分显示区域之中。例如,通过将手指放置在液晶显示屏2的显示区域中对应的指纹检测区域上方,以使屏下指纹识别装置1获取并识别手指的指纹图像。More specifically, in the above-mentioned mobile terminal or electronic device, the under-screen fingerprint identification device 1 may be arranged in a partial area below the liquid crystal display 2 and cooperate with the liquid crystal display 2 to form an under-screen fingerprint identification system. Wherein, the fingerprint detection area of the under-screen fingerprint identification device 1 may be specifically located in at least part of the display area of the liquid crystal display 2. For example, by placing a finger above the corresponding fingerprint detection area in the display area of the liquid crystal display 2, so that the fingerprint identification device 1 under the screen acquires and recognizes the fingerprint image of the finger.
如图1所示,液晶显示屏2一般包括液晶模组21和背光模组22,背光模组22设置在液晶模组21下方,用于为液晶模组21提供背光源,以使液晶模组21能够显示画面供用户观看,液晶模组21还包括走线模块24设置在液 晶模组21的非显示区域,实现液晶模组21与外界的电性连接。As shown in FIG. 1, the liquid crystal display 2 generally includes a liquid crystal module 21 and a backlight module 22. The backlight module 22 is arranged under the liquid crystal module 21 to provide a backlight source for the liquid crystal module 21 to make the liquid crystal module 21 21 can display images for users to watch. The liquid crystal module 21 also includes a wiring module 24 arranged in the non-display area of the liquid crystal module 21 to realize the electrical connection between the liquid crystal module 21 and the outside world.
具体的,屏下指纹识别装置1可以包括位于液晶显示屏2的背光模组22下方的指纹识别模组11,指纹识别模组11用于接收经指纹检测区域上方的手指反射或透射形成的并透过液晶显示屏2的指纹检测光,以获取手指的指纹图像。Specifically, the under-screen fingerprint identification device 1 may include a fingerprint identification module 11 located below the backlight module 22 of the liquid crystal display 2, and the fingerprint identification module 11 is used to receive the fingerprints formed by the reflection or transmission of the finger above the fingerprint detection area. The fingerprint detection light of the liquid crystal display 2 is transmitted to obtain the fingerprint image of the finger.
如图1所示,屏下指纹识别装置1包括指纹识别模组11,指纹识别模组11可以包括指纹传感器112,指纹传感器112可以为光学指纹传感器112,指纹传感器112可以包括具有多个感应单元的光学感应阵列以及与该光学感应阵列电性连接的读取电路及其他辅助电路。该光学感应阵列的感应区域可以对应指纹传感器112的指纹识别区域。As shown in Figure 1, the under-screen fingerprint recognition device 1 includes a fingerprint recognition module 11, the fingerprint recognition module 11 may include a fingerprint sensor 112, the fingerprint sensor 112 may be an optical fingerprint sensor 112, and the fingerprint sensor 112 may include multiple sensing units. The optical sensing array and the reading circuit and other auxiliary circuits electrically connected with the optical sensing array. The sensing area of the optical sensing array may correspond to the fingerprint recognition area of the fingerprint sensor 112.
其中,指纹传感器112可以位于液晶显示屏2的指纹检测区域下方,例如,指纹传感器112位于液晶显示屏2的指纹检测区域正对的背光模组22下方,通过将手指放置在液晶显示屏2的指纹检测区域上方,手指反射或透射形成的携带指纹信息的指纹检测光透过背光模组22传输至指纹传感器112,通过指纹传感器112的指纹识别区域获取和识别指纹图像。The fingerprint sensor 112 may be located under the fingerprint detection area of the liquid crystal display 2. For example, the fingerprint sensor 112 is located under the backlight module 22 directly opposite the fingerprint detection area of the liquid crystal display 2. Above the fingerprint detection area, the fingerprint detection light carrying fingerprint information formed by the reflection or transmission of the finger is transmitted to the fingerprint sensor 112 through the backlight module 22, and the fingerprint image is acquired and recognized through the fingerprint recognition area of the fingerprint sensor 112.
另外,由于屏下指纹识别装置1对应的指纹检测区域可以位于液晶显示屏2的显示区域之中,在用户需要对采用上述屏下指纹识别装置1的移动终端或者电子设备进行指纹解锁或者其他指纹验证的时候,其只需将手指按压在该液晶显示屏2的指纹检测区域便可以实现指纹输入,因此,该液晶显示屏2的显示区域可以扩展至覆盖整个移动终端或者电子设备的正面,满足高屏占比的全面屏需求。In addition, since the fingerprint detection area corresponding to the under-screen fingerprint identification device 1 can be located in the display area of the liquid crystal display 2, the user needs to perform fingerprint unlocking or other fingerprints on the mobile terminal or electronic device using the under-screen fingerprint identification device 1 When verifying, it only needs to press a finger on the fingerprint detection area of the liquid crystal display 2 to realize fingerprint input. Therefore, the display area of the liquid crystal display 2 can be expanded to cover the entire front of the mobile terminal or electronic device, which satisfies Full screen requirements for high screen-to-body ratio.
在一种可能的实施方式中,指纹识别模组11还可以包括光路引导结构111,光路引导结构111可以设置在指纹传感器112的上方;其中,光路引导结构111主要用于将手指按压在指纹检测区域时产生并透过液晶显示屏2的指纹检测光引导至指纹传感器112的光学感应阵列进行光学检测;指纹识别模组11还可以包括滤光层(图1未示出),该滤光层可以设置在光路引导结构111和指纹传感器112之间,或者设置在光路引导结构111的上方,用于滤除用于滤掉非目标波段的光信号,透过目标波段的光信号,目标波段即为指纹检测光的波段,以避免上述非目标波段的光信号被光学感应阵列接收而影响指纹识别效果。当所述滤光层设置在光路引导结构111和指纹传感器112 之间时,可选地,所述滤光层可以采用蒸镀工艺在指纹传感器112的光学感应阵列上进行镀膜,以集成在指纹传感器112中,从而降低指纹识别模组的厚度。In a possible implementation, the fingerprint recognition module 11 may further include a light path guiding structure 111, which may be arranged above the fingerprint sensor 112; wherein the light path guiding structure 111 is mainly used to press the finger on the fingerprint detection The fingerprint detection light generated and transmitted through the liquid crystal display 2 is guided to the optical sensing array of the fingerprint sensor 112 for optical detection; the fingerprint identification module 11 may also include a filter layer (not shown in FIG. 1). It can be arranged between the optical path guiding structure 111 and the fingerprint sensor 112, or above the optical path guiding structure 111, to filter out the light signal used to filter out the non-target waveband, and transmit the light signal of the target waveband. The target waveband is It is the wavelength band of the fingerprint detection light to prevent the optical signal of the non-target wavelength band from being received by the optical sensor array and affecting the fingerprint recognition effect. When the filter layer is disposed between the light path guiding structure 111 and the fingerprint sensor 112, optionally, the filter layer may be coated on the optical sensing array of the fingerprint sensor 112 by an evaporation process to be integrated in the fingerprint sensor 112. In the sensor 112, the thickness of the fingerprint identification module is thereby reduced.
其中,本实施例提供的屏下指纹识别装置1中,指纹传感器112、光路引导结构111和所述滤光层可以封装为一个部件以形成指纹识别模组11。Among them, in the under-screen fingerprint identification device 1 provided in this embodiment, the fingerprint sensor 112, the optical path guiding structure 111, and the filter layer may be packaged as one component to form the fingerprint identification module 11.
光路引导结构111可以采用多种实施方案。在一种可能的实施方式中,光路引导结构111可以为光学透镜层,其包括一个或多个透镜,比如一个或多个非球面透镜组成的透镜组。光学透镜层可以用于将从手指反射或透射形成并透过液晶显示屏2的指纹检测光汇聚到其下方的指纹传感器112的光学感应阵列,以使得该光学感应阵列可以基于该指纹检测光进行光学成像,从而得到该手指的指纹图像。The light path guiding structure 111 can adopt various implementations. In a possible implementation, the light path guiding structure 111 may be an optical lens layer, which includes one or more lenses, such as a lens group composed of one or more aspheric lenses. The optical lens layer can be used to converge the fingerprint detection light formed by reflection or transmission from the finger and passing through the liquid crystal display 2 to the optical sensor array of the fingerprint sensor 112 below it, so that the optical sensor array can perform processing based on the fingerprint detection light. Optical imaging is used to obtain the fingerprint image of the finger.
可选地,光学透镜层在该一个或多个透镜的光路中还可以形成有针孔或者孔径光阑,该针孔或者孔径光阑可以配合该光学透镜层扩大该屏下指纹识别装置1的视场(Filed of View,FOV),以提高该屏下指纹装置的指纹成像效果。Optionally, the optical lens layer may also be formed with a pinhole or aperture stop in the optical path of the one or more lenses, and the pinhole or aperture stop may cooperate with the optical lens layer to expand the under-screen fingerprint identification device 1 Filed of View (FOV) to improve the fingerprint imaging effect of the fingerprint device under the screen.
在另一种可能的实施方式中,光路引导结构111可以具体为在半导体硅片或者其他基底制作而成的准直器(Collimator)层,其具有多个准直单元,准直单元可以具体为具有一定深宽比的准直通孔;用户在液晶显示屏2进行指纹识别时,在液晶显示屏2上方的手指形成的并透过液晶显示屏2的指纹检测光中,入射角度与该准直单元的延伸方向基本一致的指纹检测光可以穿过准直单元并被其下方的感应单元接收,而入射角度过大的指纹检测光在该准直单元内部经过多次反射被衰减掉,因此每一个感应单元基本只能接收到其正上方的指纹检测光,从而使得光学感应阵列分别利用各个感应单元检测到的指纹检测光来获取到手指的指纹图像。In another possible implementation manner, the light path guiding structure 111 may specifically be a collimator (Collimator) layer fabricated on a semiconductor silicon wafer or other substrate, which has a plurality of collimator units, and the collimator unit may be specifically Collimation through hole with a certain aspect ratio; when the user performs fingerprint recognition on the liquid crystal display 2, in the fingerprint detection light formed by the finger above the liquid crystal display 2 and transmitted through the liquid crystal display 2, the incident angle is consistent with the collimation The fingerprint detection light with the same extending direction of the unit can pass through the collimation unit and be received by the sensing unit below it, while the fingerprint detection light with an excessively large incident angle is attenuated by multiple reflections inside the collimation unit, so every time One sensor unit can basically only receive the fingerprint detection light directly above it, so that the optical sensor array uses the fingerprint detection light detected by each sensor unit to obtain the fingerprint image of the finger.
在其他实施方式中,光路引导结构111还可以具体包括微透镜(Micro-Lens)层和光学膜层,该微透镜层包括由多个微透镜形成的微透镜阵列,其可以通过半导体生长工艺或者其他工艺形成在该指纹传感器112的光学感应阵列上方,并且每一个微透镜可以分别对应于该光学感应阵列的一个或者多个感应单元。光学膜层可以形成在该微透镜层和该光学感应单元之间,其可以包括至少一个挡光层以及形成在挡光层和微透镜层之间或者形成在挡光 层和光学感应阵列之间的介质层、钝化层或缓冲层等。其中该挡光层包括多个微孔,并采用特定光学设计来使微孔形成在其对应的微透镜和感应单元之间,从而限定感应单元的接收光路的角度。In other embodiments, the optical path guiding structure 111 may also specifically include a micro-lens (Micro-Lens) layer and an optical film layer. Other processes are formed above the optical sensing array of the fingerprint sensor 112, and each microlens may correspond to one or more sensing units of the optical sensing array. The optical film layer may be formed between the microlens layer and the optical sensing unit, which may include at least one light blocking layer and formed between the light blocking layer and the microlens layer or between the light blocking layer and the optical sensing array The dielectric layer, passivation layer or buffer layer, etc. The light blocking layer includes a plurality of micro holes, and a specific optical design is adopted to make the micro holes formed between the corresponding micro lens and the sensing unit, thereby limiting the angle of the receiving light path of the sensing unit.
其中,该挡光层可以阻挡相邻微透镜之间的光学干扰,并且微透镜将接收到的指纹光信号以垂直或者倾斜的特定角度汇聚到该微孔内部并经由该微孔传输到该感应单元以进行光学指纹成像。Wherein, the light-blocking layer can block the optical interference between adjacent microlenses, and the microlens converges the received fingerprint light signal into the microhole at a specific vertical or oblique angle and transmits it to the sensor via the microhole. Unit for optical fingerprint imaging.
可以理解的是,在实际应用中,液晶显示屏2还可以包括透明保护盖板23,比如玻璃盖板或者蓝宝石盖板,其具体位于液晶显示屏2的液晶模组21的上方并覆盖液晶模组21的正面。因此,本实施例中,所谓的手指按压在液晶显示屏2上,实际上可以具体是指按压在液晶模组21上方的透明保护盖板23或者覆盖透明保护盖板23表面的保护层(比如钢化膜或者其他保护膜)。It is understandable that in practical applications, the liquid crystal display 2 may also include a transparent protective cover 23, such as a glass cover or a sapphire cover, which is specifically located above the liquid crystal module 21 of the liquid crystal display 2 and covers the liquid crystal module. The front of group 21. Therefore, in this embodiment, the so-called finger pressing on the liquid crystal display 2 can actually refer to the transparent protective cover 23 pressed on the liquid crystal module 21 or the protective layer covering the surface of the transparent protective cover 23 (such as Tempered film or other protective film).
在一种可能的实施方式中,屏下指纹识别装置1还可以包括检测光源12,检测光源12用于发射探测光,探测光透过液晶显示屏2照射到指纹识别区域上方的手指,经手指反射或透射形成携带有指纹信息的指纹检测光。In a possible implementation, the under-screen fingerprint identification device 1 may further include a detection light source 12, which is used to emit detection light, and the detection light passes through the liquid crystal display 2 and illuminates the finger above the fingerprint identification area. The reflection or transmission forms the fingerprint detection light carrying fingerprint information.
如图1所示,本实施例中,屏下指纹识别装置1除了包括指纹识别模组11外,还包括检测光源12,检测光源12发射探测光,探测光可以透过液晶显示屏2照射到指纹检测区域上方的手指,探测光照射至手指后被手指反射或透射形成指纹检测光,形成的指纹检测光透过液晶显示屏2传输至背光模组22下方的指纹识别模组11,携带指纹信息的指纹检测光在指纹传感器112上形成指纹图像,通过指纹传感器112进行指纹识别。As shown in Figure 1, in this embodiment, the under-screen fingerprint recognition device 1 includes a fingerprint recognition module 11, and also includes a detection light source 12, which emits detection light, which can be irradiated through the liquid crystal display 2 The finger above the fingerprint detection area, the detection light is irradiated to the finger and reflected or transmitted by the finger to form fingerprint detection light. The formed fingerprint detection light is transmitted through the liquid crystal display 2 to the fingerprint recognition module 11 under the backlight module 22, carrying the fingerprint The fingerprint detection light of the information forms a fingerprint image on the fingerprint sensor 112, and fingerprint recognition is performed by the fingerprint sensor 112.
为了避免指纹检测光与背光模组22提供的背光相互影响,如图1所示,在一种可能的实施方式中,探测光与背光模组22提供的用于显示画面的背光的波长可以不同。在实际应用中,背光模组22中可以包括背光源(图1中未示出),背光源提供用于照亮液晶显示屏2的背光,通过背光模组22提供的背光以使液晶显示屏2显示画面。In order to avoid the mutual influence between the fingerprint detection light and the backlight provided by the backlight module 22, as shown in FIG. 1, in a possible implementation manner, the wavelengths of the detection light and the backlight provided by the backlight module 22 for displaying images may be different. . In practical applications, the backlight module 22 may include a backlight source (not shown in FIG. 1), the backlight source provides a backlight for illuminating the liquid crystal display 2, and the backlight provided by the backlight module 22 makes the liquid crystal display 2Display the screen.
本实施例中,屏下指纹识别装置1的检测光源12发射的探测光与背光模组22提供的背光的波长不同,这样可以避免探测光和背光之间相互影响,背光模组22的背光源发出的背光可以被全部用来照亮屏幕,以保证液晶显示屏2的亮度;而检测光源12发出的探测光则主要用来照射向指纹检测区域上方的手指,以使手指向指纹识别模组11反射或透射足够的光线,进而可以确保 指纹传感器112获取到清晰度较好的指纹图像。可选的,检测光源12可以与液晶模组并排设置在透明保护盖板23的下方,并且位于透明保护盖板23下方的边缘区域,为了避免用户通过透明保护盖板23看到下方设置的检测光源12,可以给检测光源12上方的透明保护盖板23设置一层遮光层231,遮光层能够透过检测光源12发出的检测光,可选的,遮光层231可以为油墨层,所述油墨层能够透过红外光。在一种具体实施方式中,探测光可以为红外光,背光模组22提供的背光可以为可见光。本实施例中,屏下指纹识别装置1可以采用特定波长的非可见光源来作为指纹激励光源从而实现光学指纹识别,例如,检测光源12发出的探测光可以为红外光,即检测光源12为红外光源,示例性的,红外光源可以为红外LED光源、红外垂直腔面发射激光器(Vertical Cavity Surface Emitting Laser,简称:VCSEL)或者红外激光二极管(Laser Diode)。In this embodiment, the detection light emitted by the detection light source 12 of the under-screen fingerprint identification device 1 and the backlight provided by the backlight module 22 have different wavelengths, so that the mutual influence between the detection light and the backlight can be avoided. The emitted backlight can be used to illuminate the screen to ensure the brightness of the liquid crystal display 2; and the detection light emitted by the detection light source 12 is mainly used to illuminate the finger above the fingerprint detection area, so that the finger is directed to the fingerprint recognition module 11 reflects or transmits enough light, so as to ensure that the fingerprint sensor 112 obtains a fingerprint image with better clarity. Optionally, the detection light source 12 can be arranged side by side with the liquid crystal module under the transparent protective cover 23, and located at the edge area under the transparent protective cover 23, in order to prevent the user from seeing the detection provided below through the transparent protective cover 23 For the light source 12, a light-shielding layer 231 can be provided on the transparent protective cover 23 above the detection light source 12. The light-shielding layer can transmit the detection light emitted by the detection light source 12. Optionally, the light-shielding layer 231 can be an ink layer. The layer can transmit infrared light. In a specific embodiment, the detection light may be infrared light, and the backlight provided by the backlight module 22 may be visible light. In this embodiment, the under-screen fingerprint recognition device 1 may use a non-visible light source with a specific wavelength as the fingerprint excitation light source to realize optical fingerprint recognition. For example, the detection light emitted by the detection light source 12 may be infrared light, that is, the detection light source 12 is infrared. The light source, for example, the infrared light source may be an infrared LED light source, an infrared vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL for short), or an infrared laser diode (Laser Diode).
检测光源12发出的红外光可以透过液晶模组21或者透明保护盖板23照射至液晶显示屏2的指纹检测区域上方的手指,并且红外光可在手指表面发生发射或者从手指表面透射形成红外指纹检测光,该红外指纹检测光携带有手指的指纹信息,其可以透过液晶显示屏2的液晶模组21和背光模组22,并传输到背光模组22下方的指纹识别模组11,指纹识别模组11通过光路引导结构111将指纹检测光引导至指纹传感器112的光学感应阵列,光学感应阵列可以接收指纹检测光并进一步根据指纹检测光获取手指的指纹信息。The infrared light emitted by the detection light source 12 can be irradiated to the finger above the fingerprint detection area of the liquid crystal display 2 through the liquid crystal module 21 or the transparent protective cover 23, and the infrared light can be emitted on the surface of the finger or transmitted from the surface of the finger to form infrared Fingerprint detection light. The infrared fingerprint detection light carries fingerprint information of the finger, which can pass through the liquid crystal module 21 and the backlight module 22 of the liquid crystal display 2 and be transmitted to the fingerprint recognition module 11 under the backlight module 22. The fingerprint identification module 11 guides the fingerprint detection light to the optical sensor array of the fingerprint sensor 112 through the optical path guiding structure 111. The optical sensor array can receive the fingerprint detection light and further obtain fingerprint information of the finger according to the fingerprint detection light.
背光模组22中的背光源提供的背光可以为可见光,通过可见光照亮液晶显示屏2,以使液晶显示屏2显示画面;这样屏下指纹识别装置1的检测光源12为红外光,红外光区别于背光的可见光,以避免检测光源12和背光源之间相互影响,使背光源发出的可见光全部用于照亮液晶显示屏2,检测光源12发出的红外光全部用于照射至手指以形成指纹检测光。The backlight provided by the backlight source in the backlight module 22 can be visible light. The visible light illuminates the liquid crystal display 2 so that the liquid crystal display 2 displays images; in this way, the detection light source 12 of the fingerprint identification device 1 under the screen is infrared light. Different from the visible light of the backlight, in order to avoid the mutual influence between the detection light source 12 and the backlight source, all the visible light emitted by the backlight source is used to illuminate the liquid crystal display screen 2, and the infrared light emitted by the detection light source 12 is all used to illuminate the finger to form Fingerprint detection light.
参见图1,背光模组22由上至下依次包括增亮膜221、扩散膜22、导光板223、反射膜224以及背板225,其中背板包括通孔2251以通过所述手指反射或透射形成的指纹检测光,指纹识别模组11具体可以设置在通孔2251的下方。当背光模组22中的各层光学膜材贴合在一起时,相邻两层膜材之间会形成不均匀的空气间隙导致光线在各层光学膜材之间传播时出现光程差,从而产生薄膜干涉现象。另外,对于光学膜材的对应背板225的通孔的区 域,由于该区域没有背板225的支撑,加上光学膜材自身的重力,在对应背板225的通孔的区域,各层光学膜材均有不同程度的向背板225的通孔凹陷的现象,这也会导致各层光学膜材之间形成不均匀的空气间隙,产生薄膜干涉现象。具体参见图2和图3。1, the backlight module 22 sequentially includes a brightness enhancement film 221, a diffusion film 22, a light guide plate 223, a reflective film 224, and a back plate 225 from top to bottom. The back plate includes a through hole 2251 to reflect or transmit through the finger. For the formed fingerprint detection light, the fingerprint identification module 11 can be specifically arranged under the through hole 2251. When the various layers of optical film materials in the backlight module 22 are bonded together, an uneven air gap will be formed between two adjacent layers of film materials, resulting in optical path differences when light propagates between the various layers of optical film materials. Resulting in the phenomenon of film interference. In addition, for the area of the optical film corresponding to the through hole of the back plate 225, since this area is not supported by the back plate 225, plus the gravity of the optical film itself, in the area corresponding to the through hole of the back plate 225, each layer of optical The film materials have different degrees of recession to the through holes of the back plate 225, which will also lead to the formation of uneven air gaps between the various layers of optical film materials, resulting in film interference. See Figure 2 and Figure 3 for details.
其中,图2为相邻两层光学膜材贴合时产生空气间隙的示意图,当指纹检测区域上方的手指反射或透射的指纹检测光经过各层光学膜材之间的不均匀的空气间隙时,光学膜材透射和反射的指纹检测光之间会产生薄膜干涉现象,进而会使指纹检测光形成“牛顿环”,参见图3。这会使指纹传感器112接收到的图像中包括清晰的“牛顿环”,因而严重干扰指纹成像。Among them, Figure 2 is a schematic diagram of the air gap generated when two adjacent layers of optical film materials are laminated. When the fingerprint detection light reflected or transmitted by the finger above the fingerprint detection area passes through the uneven air gap between the optical films of each layer , There will be a film interference phenomenon between the fingerprint detection light transmitted and reflected by the optical film, which will cause the fingerprint detection light to form a "Newton ring", see Figure 3. This will cause the image received by the fingerprint sensor 112 to include a clear "Newton ring", which will seriously interfere with fingerprint imaging.
为了使指纹传感器112能够获取到清晰的指纹图像,以确保指纹传感器112可有效识别指纹图像,避免指纹检测光在透过背光模组22的过程中产生薄膜干涉现象,避免各光学膜材之间产生“牛顿环”,本申请通过改变背光模组22中光学膜材的结构,以改变各光学膜材之间的空气间隙,破坏薄膜干涉的产生条件,来解决指纹检测光透过背光模组22时产生的薄膜干涉的问题,具体参见图4至图8。In order to enable the fingerprint sensor 112 to obtain a clear fingerprint image, to ensure that the fingerprint sensor 112 can effectively identify the fingerprint image, avoid the phenomenon of thin film interference caused by the fingerprint detection light in the process of passing through the backlight module 22, and avoid the optical film materials. "Newton's ring" is produced. This application changes the structure of the optical film material in the backlight module 22 to change the air gap between the optical film materials and destroy the conditions of film interference, so as to solve the problem of fingerprint detection light passing through the backlight module For the problem of film interference at 22 o'clock, see Figure 4 to Figure 8 for details.
图4示出了本申请背光模组的一个实施例,背光模组22可以包括扩散膜222和相邻设置在扩散膜222下方的导光板223,扩散膜222面向导光板223的表面具有多个间隔设置的第一微结构2221,第一微结构2221在扩散膜222的下表面随机分布,并用于增大扩散膜222和导光板223之间的间距,避免所述指纹检测光在透过扩散膜222和导光板223之间时产生薄膜干涉现象。FIG. 4 shows an embodiment of the backlight module of the present application. The backlight module 22 may include a diffuser film 222 and a light guide plate 223 adjacently disposed under the diffuser film 222. The surface of the diffuser film 222 facing the light guide plate 223 has a plurality of The first microstructures 2221 are arranged at intervals. The first microstructures 2221 are randomly distributed on the lower surface of the diffusion film 222, and are used to increase the distance between the diffusion film 222 and the light guide plate 223 to prevent the fingerprint detection light from being transmitted and diffused. A film interference phenomenon occurs between the film 222 and the light guide plate 223.
由于一般导光板的导光槽均为设计为规则排布,具有固定的排布周期,例如图4中导光板223上设置有导光槽2231,本实施例中的导光板223将在后面详细描述。相比于第一微结构2221采用规则的排布方式,第一微结构2221在扩散膜222的下表面呈现随机分布,或者可以称为不规则排布或分布时,可以有效避免扩散膜222下表面的第一微结构2221与导光槽2231形成摩尔条纹,而避免摩尔条纹形响指纹成像。Since the light guide grooves of the general light guide plate are designed to be arranged regularly and have a fixed arrangement period, for example, the light guide plate 223 in FIG. 4 is provided with a light guide groove 2231. The light guide plate 223 in this embodiment will be described in detail later describe. Compared with the regular arrangement of the first microstructures 2221, the first microstructures 2221 present a random distribution on the lower surface of the diffusion film 222, or when it can be called irregular arrangement or distribution, it can effectively avoid the diffusion film 222. The first microstructure 2221 on the surface and the light guide groove 2231 form moiré fringes, so as to prevent the moiré fringe from affecting fingerprint imaging.
扩散膜222下表面设置随机分布的第一微结构2221不仅能够解决扩散膜222与导光板223之间产生薄膜干涉的问题,还能够避免第一微结构2221与导光槽2231之间形成摩尔条纹,因而能够提升指纹成像与识别的效果。The first microstructures 2221 randomly distributed on the lower surface of the diffusion film 222 can not only solve the problem of film interference between the diffusion film 222 and the light guide plate 223, but also avoid the formation of moiré fringes between the first microstructure 2221 and the light guide groove 2231 , Which can improve the effect of fingerprint imaging and recognition.
其中,第一微结构2221的形状和大小不做限定,可以根据实际情况来设 置,作为一种可选的实施例,第一微结构2221可以为扩散膜222下表面形成的凸起结构,第一微结构2221的高度范围可以在1微米到10微米之间,可选的,第一微结构2221在水平方向的尺寸小于10微米,或者说第一微结构2221在水平方向的宽度小于10微米。The shape and size of the first microstructure 2221 are not limited, and can be set according to actual conditions. As an optional embodiment, the first microstructure 2221 may be a convex structure formed on the lower surface of the diffusion film 222. The height of a microstructure 2221 can range from 1 micrometer to 10 micrometers. Optionally, the size of the first microstructure 2221 in the horizontal direction is less than 10 micrometers, or the width of the first microstructure 2221 in the horizontal direction is less than 10 micrometers. .
图5为图4背光模组22中一种扩散膜222的下表面的正视图,可以看到第一微结构2221在扩散膜的下表面呈现随机分布。5 is a front view of the bottom surface of a diffusion film 222 in the backlight module 22 of FIG. 4, and it can be seen that the first microstructures 2221 are randomly distributed on the bottom surface of the diffusion film.
继续参见图4,背光模组22还可以包括反射膜224,反射膜224相邻设置在导光板223的下方,反射膜224用于将背光源射出的光线全都反射至导光板223,以使导光板223将光线全部由其正面射出,导光板223的正面为导光槽2231所在的面。其中,反射膜224面向导光板223的表面具有多个间隔设置的第二微结构2241,第二微结构2241在反射膜224的上表面随机分布,并用于增大反射膜224和导光板223之间的间距。类似于第一微结构2221,第二微结构2224在反射膜224的上表面呈现随机分布,或者可以称为不规则排布或分布时,不仅能够解决反射膜224与导光板223之间产生薄膜干涉的问题,还能够避免第二微结构2241与导光槽2231之间形成摩尔条纹,因而能够提升指纹成像与识别的效果。4, the backlight module 22 may also include a reflective film 224, the reflective film 224 is adjacently arranged below the light guide plate 223, the reflective film 224 is used to reflect all the light emitted by the backlight to the light guide plate 223, so that the light guide plate 223 The light plate 223 emits all light from its front surface, and the front surface of the light guide plate 223 is the surface where the light guide groove 2231 is located. Wherein, the surface of the reflective film 224 facing the light guide plate 223 has a plurality of second microstructures 2241 arranged at intervals. The second microstructures 2241 are randomly distributed on the upper surface of the reflective film 224 and are used to increase the distance between the reflective film 224 and the light guide plate 223. The spacing between. Similar to the first microstructure 2221, the second microstructure 2224 presents a random distribution on the upper surface of the reflective film 224, or when it can be called irregular arrangement or distribution, it can not only solve the problem of thin film between the reflective film 224 and the light guide plate 223 The problem of interference can also prevent the formation of moiré fringes between the second microstructure 2241 and the light guide groove 2231, thereby improving the effect of fingerprint imaging and recognition.
其中,第二微结构2241的形状和大小不做限定,可以根据实际情况来设置,作为一种可选的实施例,第二微结构2241可以为反射膜224上表面形成的凸起结构,第二微结构2241的高度范围可以在1微米到10微米之间,可选的,第二微结构2241在水平方向的尺寸小于10微米,或者说第二微结构2241在水平方向的宽度小于10微米。图4中还给出了屏下指纹识别装置1的指纹识别模组11相对于背光模组22设置位置,指纹识别模组11设置于背光模组22的下方,具体指纹识别过程及原理可参见图1内容,这里不再赘述。The shape and size of the second microstructure 2241 are not limited, and can be set according to actual conditions. As an optional embodiment, the second microstructure 2241 may be a convex structure formed on the upper surface of the reflective film 224. The height of the second microstructure 2241 can range from 1 micrometer to 10 micrometers. Optionally, the size of the second microstructure 2241 in the horizontal direction is less than 10 micrometers, or the width of the second microstructure 2241 in the horizontal direction is less than 10 micrometers. . Figure 4 also shows the position of the fingerprint identification module 11 of the under-screen fingerprint identification device 1 relative to the backlight module 22. The fingerprint identification module 11 is arranged below the backlight module 22. For the specific fingerprint identification process and principle, please refer to The content of Figure 1 will not be repeated here.
图6为图4中的导光板223的一种具体实施例。参见图6,在一种可能实施方式中,导光板223包括基材2232,基材2232的上表面设置有多个凸起的导光槽2231,导光槽2231沿导光板223的第一方向延伸,并沿导光板223的第二方向均匀间隔排列,导光槽2231沿所述第二方向的排列周期为T1。FIG. 6 is a specific embodiment of the light guide plate 223 in FIG. 4. 6, in a possible implementation manner, the light guide plate 223 includes a base material 2232, the upper surface of the base material 2232 is provided with a plurality of raised light guide grooves 2231, the light guide grooves 2231 along the first direction of the light guide plate 223 Extend and are arranged at even intervals along the second direction of the light guide plate 223, and the arrangement period of the light guide grooves 2231 along the second direction is T1.
可选地,所述第一方向平行于导光板223的长边,所述第二方向平行于导光板223的短边,或者所述第一方向平行于导光板223的短边,所述第二方向平行于导光板223的长边。Optionally, the first direction is parallel to the long side of the light guide plate 223, and the second direction is parallel to the short side of the light guide plate 223, or the first direction is parallel to the short side of the light guide plate 223. The two directions are parallel to the long side of the light guide plate 223.
本实施例中,导光槽2231可以增强导光板223的导光作用,以使位于导光板223的一侧的背光源发出的背光更好的传输至导光板223的另一侧,使从导光板223的正面出射的面光源具有较为均匀的亮度。另外,多个导光槽2231和扩散膜222的第一微结构2221共同支撑在扩散膜222和导光板223之间,可以进一步增大扩散膜222和导光板223之间的间距,有效解决扩散膜222与导光板223之间的薄膜干涉的问题。可选的,导光槽2231沿所述第二方向的截面可以为弓形。所述弓形的导光槽2231具有一定的聚光作用,在起到增强导光板223的导光作用的同时,设置导光槽2231还可以增加从导光板223出射的光线的亮度,以增强液晶显示屏2的显示效果。作为一种可选的实施例,导光槽2231的高度范围可以在1微米到3微米之间,例如导光槽2231的高度可以为1.5微米,1.75微米,1.8微米,2微米或2.5微米等,优选的,导光槽2231的高度可以为1.75微米。所述弓形对应的圆弧的曲率半径的范围可以在30微米到150微米之间,例如,所述圆弧的曲率半径可以为30微米,40微米,50微米或70微米等,优选的,所述圆弧或导光槽2231的曲率半径可以为40微米。这样导光槽2231在导光板223的表面形成较为平缓的弓形柱状结构,导光槽2231可以提高导光板223的导光效果,同时,导光槽2231和扩散膜222的第一微结构2221接触时的稳定性较好。In this embodiment, the light guide groove 2231 can enhance the light guide function of the light guide plate 223, so that the backlight emitted by the backlight source located on one side of the light guide plate 223 is better transmitted to the other side of the light guide plate 223, so that the light guide plate 223 The surface light source emitted from the front of the light plate 223 has a relatively uniform brightness. In addition, the plurality of light guide grooves 2231 and the first microstructure 2221 of the diffusion film 222 are jointly supported between the diffusion film 222 and the light guide plate 223, which can further increase the distance between the diffusion film 222 and the light guide plate 223, and effectively solve the diffusion problem. The problem of film interference between the film 222 and the light guide plate 223. Optionally, the cross section of the light guide groove 2231 along the second direction may be arcuate. The arcuate light guide groove 2231 has a certain light-gathering function. While enhancing the light guide of the light guide plate 223, the provision of the light guide groove 2231 can also increase the brightness of the light emitted from the light guide plate 223 to enhance the liquid crystal The display effect of the display screen 2. As an optional embodiment, the height of the light guide groove 2231 can range from 1 micron to 3 micrometers. For example, the height of the light guide groove 2231 can be 1.5 micrometers, 1.75 micrometers, 1.8 micrometers, 2 micrometers, 2.5 micrometers, etc. Preferably, the height of the light guide groove 2231 may be 1.75 μm. The radius of curvature of the arc corresponding to the arc can range from 30 microns to 150 microns. For example, the radius of curvature of the arc can be 30 microns, 40 microns, 50 microns or 70 microns, etc., preferably, so The radius of curvature of the arc or light guide groove 2231 may be 40 microns. In this way, the light guide groove 2231 forms a relatively smooth arcuate columnar structure on the surface of the light guide plate 223. The light guide groove 2231 can improve the light guide effect of the light guide plate 223. At the same time, the light guide groove 2231 is in contact with the first microstructure 2221 of the diffusion film 222. When the stability is better.
需要说明的是,如前所述,本实施例中,通过将扩散膜222下表面的第一微结构2221设置为随机分布的形式,多个第一微结构2221和不同导光槽2231的不同部位接触,使得扩散膜222和导光板223之间的间隙在整体上较为均匀,扩散膜222与导光板223之间的间距由第一微结构2221和导光槽2231共同决定,这样不仅可以避免扩散膜222和导光板223之间产生薄膜干涉的问题,还能够避免第一微结构2221与导光槽2231之间形成摩尔条纹,因而能够提升指纹成像的效果。It should be noted that, as mentioned above, in this embodiment, by arranging the first microstructures 2221 on the lower surface of the diffusion film 222 in a randomly distributed form, the difference between the multiple first microstructures 2221 and the different light guide grooves 2231 is different. The position contact makes the gap between the diffusion film 222 and the light guide plate 223 more uniform overall. The distance between the diffusion film 222 and the light guide plate 223 is jointly determined by the first microstructure 2221 and the light guide groove 2231, which can not only avoid The problem of thin-film interference between the diffusion film 222 and the light guide plate 223 can also avoid the formation of moiré fringes between the first microstructure 2221 and the light guide groove 2231, thereby improving the effect of fingerprint imaging.
值得注意的是,一般情况下液晶显示屏的液晶模组中包括呈阵列分布的液晶像素,导光槽2231可以沿第二方向均匀间隔排列,也即是以一定周期规则排列。因而若导光槽2231的排布周期设置不当会与液晶像素之间产生摩尔条纹,因而导致液晶显示屏出现摩尔条纹,干扰显示,从而影响显示效果,进一步也会影响指纹成像。一并参见图7a-7c以及图1,如图1、图7a-7c所示,液晶显示屏2还可以包括位于背光模组22上方设置的液晶模组21,液 晶模组21中包括呈阵列分布的液晶像素2111,用于显示画面。液晶像素2111可以包括多个子像素2111a,本实施例中,液晶像素2111包括三个子像素2111a,可选的,三个子像素2111a可以为不同颜色的子像素,例如三个子像素2111a分别为红色子像素、绿色子像素和蓝色子像素。It is worth noting that, in general, the liquid crystal module of the liquid crystal display screen includes liquid crystal pixels arranged in an array, and the light guide grooves 2231 can be arranged at even intervals along the second direction, that is, regularly arranged in a certain period. Therefore, if the arrangement period of the light guide groove 2231 is set improperly, moire fringes will be generated between the liquid crystal pixels, which will cause moiré fringes to appear on the liquid crystal display, which will interfere with the display, thereby affecting the display effect and further affecting the fingerprint imaging. Referring to FIGS. 7a-7c and FIG. 1, as shown in FIGS. 1 and 7a-7c, the liquid crystal display 2 may also include a liquid crystal module 21 disposed above the backlight module 22, and the liquid crystal module 21 includes an array The distributed liquid crystal pixels 2111 are used to display images. The liquid crystal pixel 2111 may include a plurality of sub-pixels 2111a. In this embodiment, the liquid crystal pixel 2111 includes three sub-pixels 2111a. Optionally, the three sub-pixels 2111a may be sub-pixels of different colors. For example, the three sub-pixels 2111a are red sub-pixels. , Green sub-pixel and blue sub-pixel.
作为一种可选的实施例,液晶像素2111中的三个子像素2111a的形状和大小均相同,如图7a,三个子像素2111a可以都为矩形且大小相等,此时,子像素2111a沿液晶模组21的第二方向的排列周期为T2,可以理解的是导光板223的第二方向与液晶模组211的第二方向相同,参见图7c,为了方便比较,这里将导光槽2231的排布周期相对于液晶模组21进行了标注。导光槽2231沿第二方向的排列周期为T1,并且T1>T2,即导光槽2231沿第二方向的排列周期T1大于子像素2111a沿第二方向的排列周期,以避免导光槽2231与子像素2111a的排列周期重叠而产生摩尔条纹,影响液晶显示屏2的显示效果,进而影响指纹成像与识别的效果。可选的,T1-T2≥60微米,此时,导光槽2231与子像素2111a之间几乎不产生摩尔条纹,不会影响液晶显示屏2的显示效果。As an optional embodiment, the shapes and sizes of the three sub-pixels 2111a in the liquid crystal pixel 2111 are all the same, as shown in FIG. The arrangement period of the second direction of the group 21 is T2. It can be understood that the second direction of the light guide plate 223 is the same as the second direction of the liquid crystal module 211. The cloth cycle is marked with respect to the liquid crystal module 21. The arrangement period of the light guide groove 2231 in the second direction is T1, and T1>T2, that is, the arrangement period T1 of the light guide groove 2231 in the second direction is greater than the arrangement period of the sub-pixel 2111a in the second direction, so as to avoid the light guide groove 2231 The arrangement period overlaps with the sub-pixel 2111a to generate moiré fringes, which affects the display effect of the liquid crystal display 2 and further affects the effect of fingerprint imaging and recognition. Optionally, T1-T2≥60 microns. At this time, there is almost no moiré between the light guide groove 2231 and the sub-pixel 2111a, and the display effect of the liquid crystal display 2 will not be affected.
作为另一种可选的实施例,液晶像素2111中的三个子像素2111a的形状和大小可以不同,可选的,三个子像素2111a中至少两个子像素2111a的形状或大小不相同。例如,三个子像素2111a的形状都不相同,或者三个子像素2111a的大小都不相同;再例如,三个子像素2111a中,其中有两个子像素的形状不同,或者其中有两个子像素的大小不同。如图7b,三个子像素2111a中,有两个子像素2111a的形状不同,其中一个子像素2111a的形状为矩形,另外两个子像素2111a的形状为梯形,并且形状为矩形的子像素2111a位于形状为梯形的两个子像素2111a的中间。图7a和7b中子像素2111a的形状和大小仅为示意性,可选的,子像素2111a的形状还可以为其他形状,本实施例中不做限定,可根据实际需求设置。当液晶像素2111中至少有两个子像素2111a的形状或大小不同时,液晶像素2111沿液晶模组21的第二方向的排列周期为T3,可以理解的是导光板223的第二方向与液晶模组211的第二方向相同。导光槽2231沿第二方向的排列周期为T1,并且T1>T3,即导光槽2231沿第二方向的排列周期T1大于液晶像素2111沿第二方向的排列周期,以避免导光槽2231与液晶像素2111的排列周期重叠而产生摩尔条纹,影响 液晶显示屏2的显示效果,进而影响指纹成像与识别的效果。可选的,T1-T3≥60微米,此时,导光槽2231与液晶像素2111之间几乎不产生摩尔条纹,不会影响液晶显示屏2的显示效果。可以理解的是,液晶像素2111中的颜色不同的三个子像素2111a的大小差异不能太大,否则将会出现显示的问题。As another optional embodiment, the shapes and sizes of the three sub-pixels 2111a in the liquid crystal pixel 2111 may be different. Optionally, the shapes or sizes of at least two of the three sub-pixels 2111a are different. For example, the shapes of the three sub-pixels 2111a are different, or the sizes of the three sub-pixels 2111a are different; for another example, among the three sub-pixels 2111a, two of the sub-pixels have different shapes, or two of the sub-pixels have different sizes. . As shown in Figure 7b, among the three sub-pixels 2111a, two sub-pixels 2111a have different shapes. One of the sub-pixels 2111a has a rectangular shape, the other two sub-pixels 2111a have a trapezoidal shape, and the rectangular sub-pixel 2111a is located in the shape of The middle of the two trapezoidal sub-pixels 2111a. The shape and size of the sub-pixel 2111a in FIGS. 7a and 7b are only illustrative. Optionally, the shape of the sub-pixel 2111a may also be other shapes, which are not limited in this embodiment and can be set according to actual requirements. When at least two sub-pixels 2111a in the liquid crystal pixel 2111 have different shapes or sizes, the arrangement period of the liquid crystal pixels 2111 along the second direction of the liquid crystal module 21 is T3. It can be understood that the second direction of the light guide plate 223 and the liquid crystal mold The second direction of the group 211 is the same. The arrangement period of the light guide groove 2231 in the second direction is T1, and T1>T3, that is, the arrangement period T1 of the light guide groove 2231 in the second direction is greater than the arrangement period of the liquid crystal pixels 2111 in the second direction, so as to avoid the light guide groove 2231 The arrangement period overlaps with the liquid crystal pixel 2111 to produce moiré fringes, which affects the display effect of the liquid crystal display 2 and further affects the effect of fingerprint imaging and recognition. Optionally, T1-T3≥60 microns. At this time, there is almost no moiré fringe generated between the light guide groove 2231 and the liquid crystal pixel 2111, and the display effect of the liquid crystal display 2 will not be affected. It can be understood that the size difference of the three sub-pixels 2111a with different colors in the liquid crystal pixel 2111 cannot be too large, otherwise display problems will occur.
继续参见图6,在一种可能的实施方式中,导光板223的下表面包括多个间隔分布的导光粒子2233,具体的,基材2232的下表面设置有多个间隔分布的导光粒子2233。当背光源射出的光线射到各导光粒子2233时,导光粒子2233会将反射光向各个角度扩散,然后会破坏反射条件由导光板223正面射出,即由导光槽2231所在的面射出。通过不同部位的导光粒子2233,可以使导光板223均匀发光。Continuing to refer to FIG. 6, in a possible embodiment, the lower surface of the light guide plate 223 includes a plurality of light guide particles 2233 spaced apart. Specifically, the bottom surface of the substrate 2232 is provided with a plurality of light guide particles spaced apart. 2233. When the light emitted by the backlight hits the light guide particles 2233, the light guide particles 2233 will diffuse the reflected light to various angles, and then destroy the reflection conditions. The light guide plate 223 is emitted from the front side, that is, the light guide groove 2231 is located. . The light guide particles 2233 at different positions can make the light guide plate 223 emit light uniformly.
一并参见图4和图6,导光粒子2233支撑在导光板223和反射膜224之间,能够进一步增加导光板223和反射膜224之间的间距,通过对导光粒子2233设置合理的尺寸大小,可以将导光板223和反射膜224之间的间隙控制在合理范围内,以消除导光板223和反射膜224之间产生的薄膜干涉现象。本申请实施例对导光粒子2233的尺寸大小不做限定,可根据实际情况设定,作为一种可选的实施例,导光粒子2233的高度范围可以为3微米到5微米之间,例如,导光粒子2233的高度可以为3微米、3.5微米、4微米、4.5微米或5微米等,优选的,导光粒子2233的高度可以为4微米,此时不仅能够实现导光作用,还能够避免导光板223与反射膜224之间产生的薄膜干涉现象,提升指纹成像的效果,同时,也不会使背光模组22变得太厚,而最终影响终端用户的体验。可以理解的是,导光槽2231和导光粒子2233可以与基材2232的材质相同,可以通过蚀刻等方式在基材2232的两个表面分别形成导光槽2231和导光粒子2233,使导光槽2231、基材2232和导光粒子2233为一体成型结构。4 and 6 together, the light guide particles 2233 are supported between the light guide plate 223 and the reflective film 224, which can further increase the distance between the light guide plate 223 and the reflective film 224, by setting a reasonable size for the light guide particles 2233 The size, the gap between the light guide plate 223 and the reflective film 224 can be controlled within a reasonable range, so as to eliminate the film interference phenomenon between the light guide plate 223 and the reflective film 224. The embodiment of the present application does not limit the size of the light guide particles 2233, and can be set according to actual conditions. As an optional embodiment, the height of the light guide particles 2233 can range from 3 microns to 5 microns, for example The height of the light guide particles 2233 can be 3 microns, 3.5 microns, 4 microns, 4.5 microns or 5 microns. Preferably, the height of the light guide particles 2233 can be 4 microns. At this time, not only can the light guide function be achieved, but also The film interference phenomenon between the light guide plate 223 and the reflective film 224 is avoided, and the effect of fingerprint imaging is improved. At the same time, the backlight module 22 will not become too thick, which will ultimately affect the experience of the end user. It is understandable that the light guide groove 2231 and the light guide particles 2233 can be made of the same material as the substrate 2232, and the light guide groove 2231 and the light guide particles 2233 can be formed on the two surfaces of the substrate 2232 by etching or the like, so that the guide The light groove 2231, the base material 2232 and the light guide particles 2233 are integrally formed.
在一种具体实施方式中,导光板223下表面不同区域的导光粒子2233的密度可以不同。本实施例中,导光粒子2233可以是以非均匀的形式分布在导光板223的下表面,其中,由于背光模组22的背光源设置在导光板223的一侧,因而导光板223中的离背光源较近的部位的光线较强,而离背光源较远的部位的光线较弱,因而导光板223上离背光源较近的区域的导光粒子2233的密度可以小于离背光源较远的区域的导光粒子2233的密度,以通过在不用 区域设置不同密度的导光粒子2233使导光板223各个区域具有较为均匀的光强度。In a specific embodiment, the density of the light guide particles 2233 in different regions on the lower surface of the light guide plate 223 may be different. In this embodiment, the light guide particles 2233 may be distributed on the lower surface of the light guide plate 223 in a non-uniform manner. Among them, since the backlight of the backlight module 22 is arranged on one side of the light guide plate 223, the light guide plate 223 The light in the part closer to the backlight is stronger, and the light in the part farther from the backlight is weaker. Therefore, the density of the light guide particles 2233 in the area closer to the backlight on the light guide plate 223 can be less than that of the backlight. The density of the light guide particles 2233 in the remote area is such that by disposing light guide particles 2233 of different densities in unused areas, each area of the light guide plate 223 has a relatively uniform light intensity.
参见图8,在一种可能的实施方式中,背光模组22还可以包括相邻设置在扩散膜222上方的增亮膜221,增亮膜221面向扩散膜222的表面具有多个间隔设置的第三微结构2211,第三微结构2211在增亮膜221的下表面随机分布,并用于增大增亮膜221和扩散膜222之间的间距。增亮膜221用于增强光线亮度,光线被扩散膜222均匀化后射向增亮膜221,通过增亮膜221可以进一步增大光线的亮度,以提高液晶显示屏2的亮度。Referring to FIG. 8, in a possible embodiment, the backlight module 22 may further include a brightness enhancement film 221 disposed adjacently above the diffusion film 222, and the surface of the brightness enhancement film 221 facing the diffusion film 222 has a plurality of spaced apart The third microstructures 2211 are randomly distributed on the lower surface of the brightness enhancement film 221 and are used to increase the distance between the brightness enhancement film 221 and the diffusion film 222. The brightness enhancement film 221 is used to enhance the brightness of light. The light is homogenized by the diffusion film 222 and then directed to the brightness enhancement film 221. The brightness enhancement film 221 can further increase the brightness of the light to improve the brightness of the liquid crystal display 2.
第三微结构2211支撑在增亮膜221和扩散膜222之间,以增大增亮膜221和扩散膜222之间的间隙,避免指纹检测光通过增亮膜221和扩散膜222之间时产生薄膜干涉现象,不仅如此,第三微结构2211在增亮膜221的下表面呈现随机分布,或者可以称为不规则排布或分布时,还能够避免第三微结构2211与导光槽2231之间形成摩尔条纹,因而能够提升指纹成像效果。具体的,第三微结构2211可以为嵌入增亮膜221下表面的微球结构,第三微结构2211的直径范围在4微米到10微米之间。通过将第三微结构2211设置为微球结构,可以进一步增强光亮度,提高液晶显示屏2的亮度。第三微结构2211有一部分嵌入增亮膜221下表面的基础上,暴露在增亮膜221下表面的第三微结构2211的高度仍然可以保证增亮膜221和扩散膜222之间不会产生薄膜干涉现象。示例性的,第三微结构2211的直径可以为4微米、5微米、6微米、7微米或8微米等,优选的,第三微结构2211的直径可以为5微米。The third microstructure 2211 is supported between the brightness enhancement film 221 and the diffusion film 222 to increase the gap between the brightness enhancement film 221 and the diffusion film 222 to prevent fingerprint detection light from passing between the brightness enhancement film 221 and the diffusion film 222 Film interference phenomenon occurs. Not only that, the third microstructure 2211 presents a random distribution on the lower surface of the brightness enhancement film 221, or when it can be called irregular arrangement or distribution, it can also avoid the third microstructure 2211 and the light guide groove 2231. Moiré fringes are formed between them, which can enhance the fingerprint imaging effect. Specifically, the third microstructure 2211 may be a microsphere structure embedded in the lower surface of the brightness enhancement film 221, and the diameter of the third microstructure 2211 ranges from 4 microns to 10 microns. By configuring the third microstructure 2211 as a microsphere structure, the brightness of the light can be further enhanced, and the brightness of the liquid crystal display screen 2 can be improved. On the basis that the third microstructure 2211 is partially embedded in the lower surface of the brightness enhancement film 221, the height of the third microstructure 2211 exposed on the lower surface of the brightness enhancement film 221 can still ensure that there will be no generation between the brightness enhancement film 221 and the diffusion film 222. Film interference phenomenon. Exemplarily, the diameter of the third microstructure 2211 may be 4 micrometers, 5 micrometers, 6 micrometers, 7 micrometers or 8 micrometers, etc. Preferably, the diameter of the third microstructure 2211 may be 5 micrometers.
继续参见图8,增亮膜221的上表面可以具有多个间隔设置的第四微结构2212,第四微结构2212在增亮膜221的上表面随机分布。一并参见图1,液晶显示屏2还可以包括位于背光模组22上方的液晶模组21,增亮膜221位于背光模组22的最上层,因此第四微结构2212支撑在增亮膜221和液晶模组21之间,以增大增亮膜221和液晶模组21之间的间距,避免指纹检测光通过增亮膜221和液晶模组21之间时产生薄膜干涉现象,不仅如此,第四微结构2212在增亮膜221的上表面呈现随机分布,或者可以称为不规则排布或分布时,还能够避免第四微结构2212与导光槽2231之间形成摩尔条纹,因而能够提高指纹成像效果。具体的,第四微结构2212可以为嵌入增亮膜221上表面的微球结构,第四微结构2212的直径范围在4微米到20微米之 间。第四微结构2212有一部分嵌入增亮膜221上表面的基础上,暴露在增亮膜221上表面的第四微结构2212的高度仍然可以保证增亮膜221和液晶模组21之间不会产生薄膜干涉现象。示例性的,第四微结构2212的直径可以为4微米、5微米、6微米、7微米、8微米、9微米、10微米、11微米、12微米或13微米等,优选的,第四微结构2212的直径可以为10微米。Continuing to refer to FIG. 8, the upper surface of the brightness enhancement film 221 may have a plurality of fourth microstructures 2212 arranged at intervals, and the fourth microstructures 2212 are randomly distributed on the upper surface of the brightness enhancement film 221. 1 together, the liquid crystal display 2 may also include a liquid crystal module 21 located above the backlight module 22, and the brightness enhancement film 221 is located on the uppermost layer of the backlight module 22, so the fourth microstructure 2212 is supported on the brightness enhancement film 221 And the liquid crystal module 21 to increase the distance between the brightness enhancement film 221 and the liquid crystal module 21 to avoid the phenomenon of thin film interference when the fingerprint detection light passes between the brightness enhancement film 221 and the liquid crystal module 21, not only that, When the fourth microstructure 2212 presents a random distribution on the upper surface of the brightness enhancement film 221, or can be called irregular arrangement or distribution, it can also avoid the formation of moire fringes between the fourth microstructure 2212 and the light guide groove 2231, and thus can Improve fingerprint imaging effect. Specifically, the fourth microstructure 2212 may be a microsphere structure embedded in the upper surface of the brightness enhancement film 221, and the diameter of the fourth microstructure 2212 ranges from 4 microns to 20 microns. On the basis that a part of the fourth microstructure 2212 is embedded in the upper surface of the brightness enhancement film 221, the height of the fourth microstructure 2212 exposed on the upper surface of the brightness enhancement film 221 can still ensure that there is no gap between the brightness enhancement film 221 and the liquid crystal module 21. Produce film interference phenomenon. Exemplarily, the diameter of the fourth microstructure 2212 may be 4 micrometers, 5 micrometers, 6 micrometers, 7 micrometers, 8 micrometers, 9 micrometers, 10 micrometers, 11 micrometers, 12 micrometers, or 13 micrometers, etc., preferably, the fourth micrometer The diameter of structure 2212 may be 10 microns.
实施例二Example two
在上述实施例一的基础上,本实施例提供的屏下指纹识别装置适用于具有液晶显示屏的电子设备,且屏下指纹识别装置的指纹检测区域至少部分位于液晶显示屏的显示区域;屏下指纹识别装置包括指纹识别模组,指纹识别模组位于液晶显示屏的背光模组下方,指纹检测区域上方的手指反射或透射的携带指纹信息的指纹检测光透过液晶显示屏传输至指纹传感器,通过指纹传感器接收并识别指纹图像。其中,背光模组包括层叠设置的扩散膜和导光板,导光板位于扩散膜下方,通过在扩散膜的面向导光板一侧的表面上设置多个间隔分布的第一微结构,多个第一微结构支撑在扩散膜和导光板之间,可增大扩散膜和导光板之间的间距,进而增大了扩散膜和导光板之间的空气间隙,且可使各部位的空气间隙更为均匀,进而可避免指纹检测光在透过扩散膜和导光板之间时产生薄膜干涉现象,可以消除由薄膜干涉现象产生的“牛顿环”对指纹成像的干扰,保证指纹成像效果,以使指纹传感器获得清晰的指纹图像。On the basis of the first embodiment above, the under-screen fingerprint identification device provided in this embodiment is suitable for electronic equipment with a liquid crystal display, and the fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display; The lower fingerprint recognition device includes a fingerprint recognition module. The fingerprint recognition module is located under the backlight module of the liquid crystal display. The fingerprint detection light reflected or transmitted by the finger above the fingerprint detection area is transmitted to the fingerprint sensor through the liquid crystal display. , Receive and recognize fingerprint images through the fingerprint sensor. Wherein, the backlight module includes a laminated diffusion film and a light guide plate, the light guide plate is located under the diffusion film, by arranging a plurality of first microstructures distributed at intervals on the surface of the diffusion film facing the light guide plate. The microstructure is supported between the diffuser film and the light guide plate, which can increase the distance between the diffuser film and the light guide plate, thereby increasing the air gap between the diffuser film and the light guide plate, and make the air gap of each part more Even, it can avoid the film interference phenomenon when the fingerprint detection light passes through the diffusion film and the light guide plate, and can eliminate the interference of the "Newton ring" caused by the film interference phenomenon on the fingerprint imaging, and ensure the fingerprint imaging effect to make the fingerprint The sensor obtains a clear fingerprint image.
实施例三Example three
在上述实施例一的基础上,本实施例提供一种支持屏下指纹识别功能的液晶显示屏2,该液晶显示屏2的下方设置有实施例一所述的屏下指纹识别装置1,液晶显示屏2包括液晶模组21和背光模组22,背光模组22位于液晶模组21下方,用于为液晶模组21提供背光,并将液晶显示屏2上方的手指形成的指纹检测光传输至背光模组22下方的指纹传感器112。On the basis of the first embodiment above, this embodiment provides a liquid crystal display screen 2 that supports an under-screen fingerprint recognition function. The under-screen fingerprint recognition device 1 described in the first embodiment is arranged under the liquid crystal display screen 2, and the liquid crystal display The display screen 2 includes a liquid crystal module 21 and a backlight module 22. The backlight module 22 is located under the liquid crystal module 21 and is used to provide backlight for the liquid crystal module 21 and transmit the fingerprint detection light formed by the finger above the liquid crystal display 2 To the fingerprint sensor 112 under the backlight module 22.
屏下指纹识别装置1包括检测光源12和指纹识别模组11,其中,检测光源12用于向位于指纹检测区域上方的手指发射探测光,探测光照射到指纹检测区域上方的手指,经手指反射或透射或者透射之后形成携带有指纹信息 的指纹检测光,指纹识别模组11用于接收透过液晶显示屏2的并携带有指纹信息的指纹检测光,以获取手指的指纹图像。The under-screen fingerprint recognition device 1 includes a detection light source 12 and a fingerprint recognition module 11. The detection light source 12 is used to emit detection light to the finger above the fingerprint detection area. The detection light illuminates the finger above the fingerprint detection area and is reflected by the finger. The fingerprint detection light carrying fingerprint information is formed after transmission or transmission, and the fingerprint identification module 11 is used to receive the fingerprint detection light carrying the fingerprint information through the liquid crystal display 2 to obtain the fingerprint image of the finger.
其中,本实施例可以参考实施例一中对于背光模组22的描述,在本实施例中,不再对背光模组22作进一步阐述。In this embodiment, reference may be made to the description of the backlight module 22 in the first embodiment. In this embodiment, the backlight module 22 will not be further described.
本实施例提供的液晶显示屏的下方设置有屏下指纹识别装置,液晶显示屏包括显示模组和位于显示模组下方的背光模组。其中,背光模组包括层叠设置的扩散膜和导光板,导光板位于扩散膜下方,通过在扩散膜的面向导光板一侧的表面上设置多个间隔分布的第一微结构,多个第一微结构支撑在扩散膜和导光板之间,第一微结构可增大扩散膜和导光板之间的间距,进而增大了扩散膜和导光板之间的空气间隙,且可使各部位的空气间隙更为均匀,进而可避免指纹检测光在透过扩散膜和导光板之间时产生薄膜干涉现象,可以消除由薄膜干涉现象产生的干涉光对指纹成像的干扰,保证指纹成像效果,以使指纹传感器获得清晰的指纹图像。An under-screen fingerprint identification device is provided under the liquid crystal display provided in this embodiment, and the liquid crystal display includes a display module and a backlight module located under the display module. Wherein, the backlight module includes a laminated diffusion film and a light guide plate, the light guide plate is located under the diffusion film, by arranging a plurality of first microstructures distributed at intervals on the surface of the diffusion film facing the light guide plate. The microstructure is supported between the diffusion film and the light guide plate. The first microstructure can increase the distance between the diffusion film and the light guide plate, thereby increasing the air gap between the diffusion film and the light guide plate, and make the The air gap is more uniform, which can avoid the film interference phenomenon when the fingerprint detection light passes through the diffusion film and the light guide plate, and can eliminate the interference of the interference light generated by the film interference phenomenon on the fingerprint imaging, and ensure the fingerprint imaging effect. Make the fingerprint sensor get a clear fingerprint image.
实施例四Example four
本申请实施例还提供一种电子设备,可以包括实施例三中的液晶显示屏2以及实施例二中的屏下指纹识别装置,其中液晶显示屏2可以包括实施例一中的背光模组22以及液晶模组21,其中背光模组22位于液晶模组21的下方,这里不再赘述。The embodiment of the present application also provides an electronic device, which may include the liquid crystal display 2 in the third embodiment and the under-screen fingerprint identification device in the second embodiment, wherein the liquid crystal display 2 may include the backlight module 22 in the first embodiment And the liquid crystal module 21, in which the backlight module 22 is located below the liquid crystal module 21, which will not be repeated here.
最后应说明的是:以上各实施例仅用以说明本申请的技术方案,而非对其限制;尽管参照前述各实施例对本申请进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. Scope.
Claims (42)
- 一种屏下指纹识别装置,适用于具有液晶显示屏的电子设备,其特征在于,所述屏下指纹识别装置的指纹检测区域至少部分位于所述液晶显示屏的显示区域;An under-screen fingerprint identification device suitable for electronic equipment with a liquid crystal display screen, characterized in that the fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display screen;所述屏下指纹识别装置包括位于所述液晶显示屏的背光模组下方的指纹识别模组,所述指纹识别模组用于接收经所述指纹检测区域上方的手指反射或透射形成的并透过所述液晶显示屏的指纹检测光,以获取所述手指的指纹图像;The under-screen fingerprint identification device includes a fingerprint identification module located below the backlight module of the liquid crystal display, and the fingerprint identification module is used to receive the fingerprint identification module formed by the reflection or transmission of the finger above the fingerprint detection area. Pass the fingerprint detection light of the liquid crystal display to obtain the fingerprint image of the finger;其中,所述背光模组包括扩散膜、导光板和反射膜,所述导光板相邻设置在所述扩散膜的下方,所述扩散膜面向所述导光板的表面具有多个间隔设置的第一微结构,所述第一微结构在所述扩散膜的下表面随机分布,并用于增大所述扩散膜和所述导光板之间的间距,所述反射膜相邻设置在所述导光板的下方,所述反射膜面向所述导光板的表面具有多个间隔设置的第二微结构,所述第二微结构在所述反射膜的上表面随机分布,并用于增大所述反射膜和所述导光板之间的间距。Wherein, the backlight module includes a diffuser film, a light guide plate and a reflective film, the light guide plate is arranged adjacently below the diffuser film, and the surface of the diffuser film facing the light guide plate has a plurality of spaced first A microstructure, the first microstructure is randomly distributed on the lower surface of the diffusion film and used to increase the distance between the diffusion film and the light guide plate, and the reflective film is adjacently arranged on the guide plate Below the light plate, the surface of the reflective film facing the light guide plate has a plurality of second microstructures arranged at intervals, and the second microstructures are randomly distributed on the upper surface of the reflective film and used to increase the reflection The distance between the film and the light guide plate.
- 根据权利要求1所述的屏下指纹识别装置,其特征在于,所述第一微结构为所述扩散膜的下表面形成的凸起结构,所述第一微结构的高度范围在1微米到10微米之间。The under-screen fingerprint identification device according to claim 1, wherein the first microstructure is a convex structure formed on the lower surface of the diffusion film, and the height of the first microstructure ranges from 1 micron to Between 10 microns.
- 根据权利要求1或2所述的屏下指纹识别装置,其特征在于,所述第二微结构为所述反射膜的上表面形成的凸起结构,所述第二微结构的高度范围在1微米到10微米之间。The under-screen fingerprint identification device according to claim 1 or 2, wherein the second microstructure is a convex structure formed on the upper surface of the reflective film, and the height range of the second microstructure is 1 Between microns and 10 microns.
- 根据权利要求1-3中任一项所述的屏下指纹识别装置,其特征在于,所述导光板包括基材,所述基材的上表面设置有多个凸起的导光槽,所述导光槽沿所述导光板的第一方向延伸,并沿所述导光板的第二方向均匀间隔排列,所述导光槽沿所述第二方向的排列周期为T1。The under-screen fingerprint identification device according to any one of claims 1 to 3, wherein the light guide plate comprises a base material, and the upper surface of the base material is provided with a plurality of convex light guide grooves, so The light guide grooves extend along the first direction of the light guide plate and are arranged at even intervals along the second direction of the light guide plate, and the arrangement period of the light guide grooves along the second direction is T1.
- 根据权利要求4所述的屏下指纹识别装置,其特征在于,所述第一方向平行于所述导光板的长边,所述第二方向平行于所述导光板的短边;The under-screen fingerprint identification device according to claim 4, wherein the first direction is parallel to the long side of the light guide plate, and the second direction is parallel to the short side of the light guide plate;或者,所述第一方向平行于所述导光板的短边,所述第二方向平行于所述导光板的长边。Alternatively, the first direction is parallel to the short side of the light guide plate, and the second direction is parallel to the long side of the light guide plate.
- 根据权利要求4或5所述的屏下指纹识别装置,其特征在于,所述导光 槽的高度范围在1微米到3微米之间。The under-screen fingerprint identification device according to claim 4 or 5, wherein the height of the light guide groove ranges from 1 micrometer to 3 micrometers.
- 根据权利要求6所述的屏下指纹识别装置,其特征在于,所述导光槽的高度为1.75微米。The under-screen fingerprint identification device according to claim 6, wherein the height of the light guide groove is 1.75 micrometers.
- 根据权利要求4-7中任一项所述的屏下指纹识别装置,其特征在于,所述导光槽沿所述第二方向的截面为弓形,所述弓形对应的圆弧的曲率半径的范围在30微米到150微米之间。The under-screen fingerprint identification device according to any one of claims 4-7, wherein the cross section of the light guide groove along the second direction is arcuate, and the curvature radius of the arc corresponding to the arcuate The range is between 30 microns and 150 microns.
- 根据权利要求8所述的屏下指纹识别装置,其特征在于,所述圆弧的曲率半径为40微米。The under-screen fingerprint identification device according to claim 8, wherein the radius of curvature of the arc is 40 microns.
- 根据权利要求4-9中任一项所述的屏下指纹识别装置,其特征在于,所述液晶显示屏还包括位于所述背光模组上方的液晶模组,所述液晶模组中包括呈阵列分布的液晶像素,所述液晶像素包括三个形状和大小均相同的子像素,所述子像素沿所述第二方向的排列周期为T2,并且T1>T2。The under-screen fingerprint identification device according to any one of claims 4-9, wherein the liquid crystal display further comprises a liquid crystal module located above the backlight module, and the liquid crystal module includes An array of liquid crystal pixels, the liquid crystal pixel includes three sub-pixels with the same shape and size, and the arrangement period of the sub-pixels along the second direction is T2, and T1>T2.
- 根据权利要求10所述的屏下指纹识别装置,其特征在于,T1-T2≥60微米。The under-screen fingerprint identification device according to claim 10, wherein T1-T2 is greater than or equal to 60 microns.
- 根据权利要求4-9中任一项所述的屏下指纹识别装置,其特征在于,所述液晶显示屏还包括位于所述背光模组上方的液晶模组,所述液晶模组中包括呈阵列分布的液晶像素,所述液晶像素包括三个子像素,其中所述三个子像素中至少两个子像素的形状或大小不同,所述液晶像素沿所述第二方向的排列周期为T3,并且T1>T3。The under-screen fingerprint identification device according to any one of claims 4-9, wherein the liquid crystal display further comprises a liquid crystal module located above the backlight module, and the liquid crystal module includes An array of liquid crystal pixels, the liquid crystal pixel includes three sub-pixels, wherein at least two of the three sub-pixels have different shapes or sizes, the arrangement period of the liquid crystal pixels along the second direction is T3, and T1 >T3.
- 根据权利要求12所述的屏下指纹识别装置,其特征在于,T1-T3≥60微米。The under-screen fingerprint identification device according to claim 12, wherein T1-T3 is greater than or equal to 60 microns.
- 根据权利要求12或13所述的屏下指纹识别装置,其特征在于,所述三个子像素中的一个子像素的形状为矩形,另外两个子像素的形状为梯形,并且形状为矩形的所述一个子像素位于形状为梯形的所述两个子像素的中间。The under-screen fingerprint identification device according to claim 12 or 13, wherein one of the three sub-pixels has a rectangular shape, the other two sub-pixels have a trapezoidal shape, and the shape of the three sub-pixels is a rectangle. One sub-pixel is located in the middle of the two sub-pixels with a trapezoidal shape.
- 根据权利要求4-14中任一项所述的屏下指纹识别装置,其特征在于,所述基材的下表面设置有多个间隔分布的导光粒子,所述导光粒子的高度范围在3微米到5微米之间,所述导光槽、所述基材和所述导光粒子为一体成型结构。The under-screen fingerprint identification device according to any one of claims 4-14, wherein the lower surface of the substrate is provided with a plurality of light guide particles distributed at intervals, and the height of the light guide particles is in the range of Between 3 micrometers and 5 micrometers, the light guide groove, the substrate and the light guide particles are integrally formed.
- 根据权利要求1-15中任一项所述的屏下指纹识别装置,其特征在于,所述背光模组还包括相邻设置在所述扩散膜上方的增亮膜,所述增亮膜面向 所述扩散膜的表面具有多个间隔设置的第三微结构,所述第三微结构在所述增亮膜的下表面随机分布,以用于增大所述增亮膜和所述扩散膜之间的间距。The under-screen fingerprint identification device according to any one of claims 1-15, wherein the backlight module further comprises a brightness enhancement film arranged adjacently above the diffusion film, and the brightness enhancement film faces The surface of the diffusion film has a plurality of third microstructures arranged at intervals, and the third microstructures are randomly distributed on the lower surface of the brightness enhancement film for increasing the brightness enhancement film and the diffusion film The spacing between.
- 根据权利要求16所述的屏下指纹识别装置,其特征在于,所述增亮膜的上表面具有多个间隔设置的第四微结构,所述第四微结构在所述增亮膜的上表面随机分布。The under-screen fingerprint identification device according to claim 16, wherein the upper surface of the brightness enhancement film has a plurality of fourth microstructures arranged at intervals, and the fourth microstructures are on the upper surface of the brightness enhancement film. The surface is randomly distributed.
- 根据权利要求17所述的屏下指纹识别装置,其特征在于,所述第三微结构为所述增亮膜的下表面形成的微球结构,所述第三微结构的直径范围在4微米到10微米之间;The under-screen fingerprint identification device according to claim 17, wherein the third microstructure is a microsphere structure formed on the lower surface of the brightness enhancement film, and the diameter of the third microstructure is in the range of 4 micrometers. Between 10 microns;所述第四微结构为所述增亮膜的上表面形成的微球结构,所述第四微结构的直径范围在4微米到20微米之间。The fourth microstructure is a microsphere structure formed on the upper surface of the brightness enhancement film, and the diameter of the fourth microstructure ranges from 4 micrometers to 20 micrometers.
- 根据权利要求17或18所述的屏下指纹识别装置,其特征在于,所述液晶显示屏还包括位于所述背光模组上方的液晶模组,所述第四微结构用于增大所述增亮膜和所述液晶模组之间的间距。The under-screen fingerprint identification device according to claim 17 or 18, wherein the liquid crystal display further comprises a liquid crystal module located above the backlight module, and the fourth microstructure is used to enlarge the The distance between the brightness enhancement film and the liquid crystal module.
- 根据权利要求1-19中任一项所述的屏下指纹识别装置,其特征在于,还包括检测光源,所述检测光源用于发射探测光,所述探测光透过所述液晶显示屏照射到所述指纹识别区域上方的手指,经手指反射或透射形成携带有指纹信息的所述指纹检测光。The under-screen fingerprint identification device according to any one of claims 1-19, further comprising a detection light source, the detection light source is used to emit detection light, and the detection light is irradiated through the liquid crystal display A finger above the fingerprint identification area is reflected or transmitted by the finger to form the fingerprint detection light carrying fingerprint information.
- 根据权利要求20所述的屏下指纹识别装置,其特征在于,所述探测光与所述背光模组提供的用于显示画面的背光的波长不同,所述探测光为红外光,所述背光模组提供的所述背光为可见光。The under-screen fingerprint identification device according to claim 20, wherein the wavelength of the detection light is different from that of the backlight provided by the backlight module for displaying images, the detection light is infrared light, and the backlight The backlight provided by the module is visible light.
- 一种背光模组,适用于支持屏下指纹识别功能的液晶显示屏,其特征在于,包括扩散膜、导光板和反射膜,所述导光板相邻设置在所述扩散膜的下方,所述扩散膜面向所述导光板的表面具有多个间隔设置的第一微结构,所述第一微结构在所述扩散膜的下表面随机分布,并用于增大所述扩散膜和所述导光板之间的间距,所述反射膜相邻设置在所述导光板的下方,所述反射膜面向所述导光板的表面具有多个间隔设置的第二微结构,所述第二微结构在所述反射膜的上表面随机分布,并用于增大所述反射膜和所述导光板之间的间距。A backlight module is suitable for a liquid crystal display screen that supports fingerprint recognition under the screen, and is characterized in that it comprises a diffuser film, a light guide plate and a reflective film. The surface of the diffusion film facing the light guide plate has a plurality of first microstructures arranged at intervals, and the first microstructures are randomly distributed on the lower surface of the diffusion film and are used to enlarge the diffusion film and the light guide plate The reflective film is adjacently arranged below the light guide plate, and the surface of the reflective film facing the light guide plate has a plurality of second microstructures arranged at intervals. The upper surface of the reflective film is randomly distributed, and is used to increase the distance between the reflective film and the light guide plate.
- 根据权利要求22所述的背光模组,其特征在于,所述第一微结构为所述扩散膜的下表面形成的凸起结构,所述第一微结构的高度范围在1微米到 10微米之间。The backlight module according to claim 22, wherein the first microstructure is a convex structure formed on the lower surface of the diffusion film, and the height of the first microstructure ranges from 1 micrometer to 10 micrometers. between.
- 根据权利要求22或23所述的背光模组,其特征在于,所述第二微结构为所述反射膜的上表面形成的凸起结构,所述第二微结构的高度范围在1微米到10微米之间。The backlight module according to claim 22 or 23, wherein the second microstructure is a convex structure formed on the upper surface of the reflective film, and the height of the second microstructure ranges from 1 micron to Between 10 microns.
- 根据权利要求22-24中任一项所述的背光模组,其特征在于,所述导光板包括基材,所述基材的上表面设置有多个凸起的导光槽,所述导光槽沿所述导光板的第一方向延伸,并沿所述导光板的第二方向均匀间隔排列,所述导光槽沿所述第二方向的排列周期为T1。The backlight module according to any one of claims 22-24, wherein the light guide plate comprises a substrate, the upper surface of the substrate is provided with a plurality of convex light guide grooves, the guide The light grooves extend along the first direction of the light guide plate and are arranged at even intervals along the second direction of the light guide plate, and the arrangement period of the light guide grooves along the second direction is T1.
- 根据权利要求25所述的背光模组,其特征在于,所述第一方向平行于所述导光板的长边,所述第二方向平行于所述导光板的短边;The backlight module of claim 25, wherein the first direction is parallel to the long side of the light guide plate, and the second direction is parallel to the short side of the light guide plate;或者,所述第一方向平行于所述导光板的短边,所述第二方向平行于所述导光板的长边。Alternatively, the first direction is parallel to the short side of the light guide plate, and the second direction is parallel to the long side of the light guide plate.
- 根据权利要求25或26所述的背光模组,其特征在于,所述导光槽的高度范围在1微米到3微米之间。The backlight module of claim 25 or 26, wherein the height of the light guide groove ranges from 1 micrometer to 3 micrometers.
- 根据权利要求27所述的背光模组,其特征在于,所述导光槽的高度为1.75微米。28. The backlight module of claim 27, wherein the height of the light guide groove is 1.75 micrometers.
- 根据权利要求25-28中任一项所述的背光模组,其特征在于,多所述导光槽沿所述第二方向的截面为弓形,所述弓形对应的圆弧的曲率半径的范围在30微米到150微米之间。The backlight module according to any one of claims 25-28, wherein the cross-section of the plurality of light guide grooves along the second direction is arcuate, and the arcuate shape corresponds to the range of the radius of curvature of the arc Between 30 microns and 150 microns.
- 根据权利要求29所述的背光模组,其特征在于,所述圆弧的曲率半径为40微米。The backlight module of claim 29, wherein the radius of curvature of the arc is 40 microns.
- 根据权利要求25-30中任一项所述的背光模组,其特征在于,所述液晶显示屏还包括位于所述背光模组上方的液晶模组,所述液晶模组中包括呈阵列分布的液晶像素,所述液晶像素包括三个形状和大小均相同的子像素,所述子像素沿所述第二方向的排列周期为T2,并且T1>T2。The backlight module according to any one of claims 25-30, wherein the liquid crystal display screen further comprises a liquid crystal module located above the backlight module, and the liquid crystal module includes an array distributed The liquid crystal pixel includes three sub-pixels with the same shape and size, and the arrangement period of the sub-pixels along the second direction is T2, and T1>T2.
- 根据权利要求31所述的背光模组,其特征在于,T1-T2≥60微米。The backlight module of claim 31, wherein T1-T2≥60 microns.
- 根据权利要求25-30中任一项所述的背光模组,其特征在于,所述液晶显示屏还包括位于所述背光模组上方的液晶模组,所述液晶模组中包括呈阵列分布的液晶像素,所述液晶像素包括三个子像素,其中所述三个子像素中至少两个子像素的形状或大小不同,所述液晶像素沿所述第二方向的排列 周期为T3,并且T1>T3。The backlight module according to any one of claims 25-30, wherein the liquid crystal display screen further comprises a liquid crystal module located above the backlight module, and the liquid crystal module includes an array distributed The liquid crystal pixel includes three sub-pixels, wherein at least two of the three sub-pixels have different shapes or sizes, and the arrangement period of the liquid crystal pixels along the second direction is T3, and T1>T3 .
- 根据权利要求33所述的背光模组,其特征在于,T1-T3≥60微米。The backlight module of claim 33, wherein T1-T3≥60 microns.
- 根据权利要求33或34所述的背光模组,其特征在于,所述三个子像素中的一个子像素的形状为矩形,另外两个子像素的形状为梯形,并且形状为矩形的所述一个子像素位于形状为梯形的所述两个子像素的中间。The backlight module according to claim 33 or 34, wherein the shape of one sub-pixel of the three sub-pixels is a rectangle, the shape of the other two sub-pixels is a trapezoid, and the shape of the one sub-pixel is a rectangle. The pixel is located in the middle of the two sub-pixels that are trapezoidal in shape.
- 根据权利要求25-35中任一项所述的背光模组,其特征在于,所述基材的下表面设置有多个间隔分布的导光粒子,所述导光粒子的高度范围在3微米到5微米之间,所述导光槽、所述基材和所述导光粒子为一体成型结构。The backlight module according to any one of claims 25-35, wherein the lower surface of the substrate is provided with a plurality of light guide particles distributed at intervals, and the height of the light guide particles is in the range of 3 microns. Between 5 microns and 5 microns, the light guide groove, the substrate and the light guide particles are integrally formed.
- 根据权利要求22-36中任一项所述的背光模组,其特征在于,所述背光模组还包括相邻设置在所述扩散膜上方的增亮膜,所述增亮膜面向所述扩散膜的表面具有多个间隔设置的第三微结构,所述第三微结构在所述增亮膜的下表面随机分布,以用于增大所述增亮膜和所述扩散膜之间的间距。The backlight module according to any one of claims 22-36, wherein the backlight module further comprises a brightness enhancement film adjacently arranged above the diffusion film, and the brightness enhancement film faces the The surface of the diffusion film has a plurality of third microstructures arranged at intervals, and the third microstructures are randomly distributed on the lower surface of the brightness enhancement film to increase the gap between the brightness enhancement film and the diffusion film. Pitch.
- 根据权利要求37所述的背光模组,其特征在于,所述增亮膜的上表面具有多个间隔设置的第四微结构,所述第四微结构在所述增亮膜的上表面随机分布。The backlight module of claim 37, wherein the upper surface of the brightness enhancement film has a plurality of fourth microstructures arranged at intervals, and the fourth microstructures are randomly arranged on the upper surface of the brightness enhancement film. distributed.
- 根据权利要求38所述的背光模组,其特征在于,所述第三微结构为所述增亮膜的下表面形成的微球结构,所述第三微结构的直径范围在4微米到10微米之间;The backlight module of claim 38, wherein the third microstructure is a microsphere structure formed on the lower surface of the brightness enhancement film, and the diameter of the third microstructure ranges from 4 microns to 10 microns. Between micrometers所述第四微结构为所述增亮膜的上表面形成的微球结构,所述第四微结构的直径范围在4微米到20微米之间。The fourth microstructure is a microsphere structure formed on the upper surface of the brightness enhancement film, and the diameter of the fourth microstructure ranges from 4 micrometers to 20 micrometers.
- 根据权利要求38或39所述的背光模组,其特征在于,所述液晶显示屏还包括位于所述背光模组上方的液晶模组,所述第四微结构用于增大所述增亮膜和所述液晶模组之间的间距。The backlight module according to claim 38 or 39, wherein the liquid crystal display further comprises a liquid crystal module located above the backlight module, and the fourth microstructure is used to increase the brightness The distance between the film and the liquid crystal module.
- 一种支持屏下指纹识别功能的液晶显示屏,其特征在于,所述液晶显示屏的下方设置有权利要求1-21中任一项所述的屏下指纹识别装置,所述液晶显示屏包括液晶模组和权利要求22-40中任一项所述的背光模组,所述背光模组位于所述液晶模组下方,用于为所述液晶模组提供背光,并将所述液晶显示屏上方的手指反射或透射形成的指纹检测光传输至所述背光模组下方的所述屏下指纹识别装置。A liquid crystal display supporting an under-screen fingerprint identification function, characterized in that the under-screen fingerprint identification device according to any one of claims 1-21 is arranged below the liquid crystal display, and the liquid crystal display comprises The liquid crystal module and the backlight module of any one of claims 22-40, the backlight module is located under the liquid crystal module, used to provide a backlight for the liquid crystal module, and display the liquid crystal The fingerprint detection light formed by the reflection or transmission of the finger above the screen is transmitted to the under-screen fingerprint identification device below the backlight module.
- 一种电子设备,其特征在于,包括液晶显示屏和权利要求1-21中任 一项所述的屏下指纹识别装置,所述液晶显示屏包括液晶模组和权利要求22-40中任一项所述的背光模组,其中,所述背光模组位于所述液晶模组的下方。An electronic device, characterized by comprising a liquid crystal display and the under-screen fingerprint identification device according to any one of claims 1-21, the liquid crystal display comprising a liquid crystal module and any one of claims 22-40 The backlight module of item 1, wherein the backlight module is located below the liquid crystal module.
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