CN210119794U - Infrared fingerprint identification module and electronic device - Google Patents

Abstract

The application relates to an infrared fingerprint identification module, which is arranged below a liquid crystal panel of an electronic device. The backlight module comprises a first light source, a second light source, a light guide plate and a reflecting sheet, wherein the light guide plate is positioned between the infrared receiving module and the liquid crystal panel, and the reflecting sheet is positioned between the light guide plate and the infrared receiving module. The first light source and the second light source are respectively fixed at two side edges of the light guide plate and used for emitting infrared light by the light guide plate at the same time. And infrared light is emitted into the liquid crystal panel from one side of the light guide plate, which is far away from the reflector, under the action of the reflector. When a finger of a user touches the liquid crystal panel, the infrared receiving component is used for receiving infrared light reflected by the finger to realize a fingerprint identification function. The infrared fingerprint identification module saves a light emitting device arranged below the liquid crystal panel, saves the internal space and increases the area of fingerprint identification.

Description

Infrared fingerprint identification module and electronic device

Technical Field

The application relates to the field of electronic devices, in particular to an infrared fingerprint identification module with a compact structure and an electronic device adopting the infrared fingerprint identification module.

Background

Currently, electronic devices are generally provided with a fingerprint identification function, and particularly under the trend of full-screen, the technology of fingerprint identification under the screen is increasingly emphasized. Currently, the infrared light emitting device 10a in the infrared fingerprint module 100a is disposed below the backlight assembly 200a as an independent device (see fig. 1), and the infrared light emitting device 10a and the infrared light receiving device 20a are disposed side by side. Therefore, the internal space of the electronic device is occupied greatly, and the light-emitting angle of the point light source of the infrared light-emitting device 10a is small, so that the fingerprint identification area is small, and the position of the infrared fingerprint identification module 100a is relatively fixed.

SUMMERY OF THE UTILITY MODEL

The application provides a luminous infrared fingerprint identification module in two sides of light source, has saved and has set up independent infrared light emitter in order to save space below the screen, specifically includes following technical scheme:

an infrared fingerprint identification module is arranged below a liquid crystal panel of an electronic device, and comprises an infrared receiving assembly and a backlight assembly, wherein the backlight assembly comprises a first light source, a second light source, a light guide plate and a reflecting sheet, the light guide plate is arranged between the infrared receiving assembly and the liquid crystal panel, the reflecting sheet is arranged between the light guide plate and the infrared receiving assembly, the reflecting sheet can penetrate infrared light, the light guide plate comprises a first side edge and a second side edge opposite to the first side edge, the first light source is fixed at the position, close to the first side edge, of the light guide plate, the second light source is fixed at the position, close to the second side edge, of the light guide plate, the first light source and/or the second light source are/is used for emitting infrared light to the light guide plate towards the side edge, and the infrared light is emitted into the liquid crystal panel from the side, far away from, when a finger of a user touches the liquid crystal panel, the infrared receiving component is used for receiving infrared light reflected by the finger to realize a fingerprint identification function.

The infrared fingerprint identification module of this application, through inciting somebody to action infrared receiving component set up in liquid crystal display panel's below makes it possess the basis of fingerprint identification under the screen. The first light source emits infrared light from the first side edge of the light guide plate, and the second light source emits infrared light from the second side edge, so that the infrared light can be emitted into the light guide plate to be fully diffused, and most of the infrared light is emitted from the light guide plate towards one side of the liquid crystal panel under the action of the reflector. After the infrared light passes through the liquid crystal panel, if a finger of a user touches the liquid crystal panel, the infrared light can be reflected to the infrared receiving assembly, and because the reflective sheet can be penetrated by the infrared light, the infrared light can identify the identity of the user through the infrared light received by the infrared receiving assembly, so that the fingerprint identification function is realized. The infrared fingerprint identification module does not need to be provided with the infrared light emitting device below the screen independently, so that the part of space can be saved, and arrangement of internal devices of the electronic device is facilitated. Simultaneously first light source with the second light source is followed the relative both sides simultaneous emission infrared light of light guide plate has guaranteed infrared luminous intensity in the light guide plate, and through the diffusion of light guide plate to the infrared light has increased the effect area of infrared light, makes infrared receiving assembly can arrange in bigger scope, can both realize the effective receipt of infrared light, further is favorable to electron device's internal device design of arranging.

The backlight assembly comprises a support, the support comprises an accommodating space, the first light source, the second light source, the light guide plate and the light reflecting sheets are all contained in the accommodating space, the support comprises a bottom plate, the bottom plate is located between the infrared receiving assembly and the light reflecting sheets, the bottom plate is further provided with an opening, and the infrared receiving assembly is right opposite to the opening so that the infrared receiving assembly receives infrared light passing through the opening. Through the fixing of the bracket to the backlight assembly, the backlight assembly can be better positioned, and the arrangement of the opening hole also meets the light passing requirement of the infrared receiving assembly.

The backlight assembly further comprises a diffusion sheet and a brightness enhancement sheet, wherein the diffusion sheet and the brightness enhancement sheet are both positioned between the light guide plate and the liquid crystal panel, and the diffusion sheet is positioned between the brightness enhancement sheet and the light guide plate. The diffusion sheet and the brightness enhancement sheet can further improve the action range and the action effect of infrared light.

Wherein, first light source includes first fixed strip, the second light source includes the second fixed strip, first fixed strip is followed in length direction first side sets up, the second fixed strip is followed in length direction the second side sets up, first light source with the second light source is still including infrared light LED, infrared light LED with first fixed strip with second fixed strip fixed connection, infrared light LED orientation first side with the second side is luminous, just infrared light LED is a plurality of, and is a plurality of infrared light LED interval set up in first fixed strip with on the second fixed strip. The infrared light LEDs arranged at intervals can act on a larger range, and the fingerprint identification area is increased.

The first fixing strip is provided with a first section in the length direction, the first section is arranged corresponding to the infrared receiving assembly in the length direction of the first fixing strip, the second fixing strip is provided with a second section in the length direction, the second section is also arranged corresponding to the infrared receiving assembly in the length direction of the second fixing strip, and the plurality of infrared light LEDs are at least arranged in the first section and the second section so as to ensure the quantity of infrared light reflected to the infrared receiving assembly. Will infrared light LED concentrates on in first district section with the second district section to correspond the better receipt of infrared receiving component can improve the identification efficiency of this application infrared fingerprint identification module.

The infrared light LEDs arranged in the first section and the infrared light LEDs arranged in the second section are arranged in a staggered mode in the length direction of the first fixing strip. The staggered infrared light LEDs can be mutually complemented in the first section and the second section, so that infrared light can be more uniformly and sufficiently projected to the corresponding area of the infrared receiving assembly.

The first light source and/or the second light source further comprise a plurality of visible light LEDs, the visible light LEDs are also fixedly connected with the first fixing strip and/or the second fixing strip, and the plurality of visible light LEDs are arranged on the first fixing strip and/or the second fixing strip at intervals along the length direction of the first fixing strip and emit light towards the first side and/or the second side, so that the backlight assembly can simultaneously send infrared light and visible light to the liquid crystal panel. Visible light LED makes this application infrared fingerprint identification module backlight unit can also be regarded as liquid crystal display panel's backlight unit reaches and provides the infrared light simultaneously and is used for user identification to and provide the effect that visible light is used for liquid crystal display panel to show.

The visible light LEDs and the infrared light LEDs at least arranged in the first section and the second section are arranged on the first fixing strip and the second fixing strip at intervals. The visible light LED and the infrared light LED are arranged at intervals, so that the visible light and the infrared light in the same area can be ensured to respectively reach the light quantity required by respective functions.

The application also relates to an electronic device, which comprises a liquid crystal panel and the infrared fingerprint identification module, wherein the liquid crystal panel is fixedly connected with the infrared fingerprint identification module through an optical adhesive. Electronic device adopts above-mentioned infrared fingerprint identification module, can improve electronic device's inner space utilization, makes electronic device realize fingerprint identification under the screen simultaneously, and its identification area is bigger than fingerprint identification area under the current screen, can set up in a flexible way.

The liquid crystal panel comprises an upper polarizer, a liquid crystal layer and a lower polarizer, the lower polarizer is located between the upper polarizer and the infrared fingerprint identification module, and the liquid crystal layer is located between the upper polarizer and the lower polarizer. The upper and lower polaroids are arranged to filter the ambient light and eliminate the influence of the ambient light on the fingerprint identification function.

The liquid crystal panel further comprises protective glass, the protective glass is located on one side, away from the infrared fingerprint identification module, of the liquid crystal panel, and the protective glass is adhered to the upper polarizer through the optical cement. The protective glass is used for covering and protecting the liquid crystal panel and the infrared fingerprint identification module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.

FIG. 1 is a schematic diagram of a prior art infrared fingerprint recognition module;

FIG. 2 is a schematic diagram of an electronic device provided by an embodiment of the present application;

fig. 3 is a schematic view of a light path of a light guide plate in the infrared fingerprint identification module according to the embodiment of the present application;

fig. 4 is a schematic diagram of a first light source and a second light source in an infrared fingerprint identification module according to an embodiment of the present disclosure;

fig. 5 is a schematic view of a first light source and a second light source in an infrared fingerprint identification module according to another embodiment of the present disclosure;

fig. 6 is a schematic view of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Please refer to fig. 2, which illustrates an electronic device 100 of the present application, disposed below a liquid crystal panel 300 of an electronic device 200. It is understood that the lower side herein refers to the back side of the light emitting surface 301 of the liquid crystal panel 300. The infrared fingerprint identification module 100 includes an infrared receiving assembly 10 and a backlight assembly 20. Wherein the backlight assembly 20 includes a first light source 21a, a second light source 21b, a light guide plate 22, and a reflective sheet 23. In which the infrared receiving module 10, the reflective sheet 23, the light guide plate 22, and the liquid crystal panel 300 are disposed in a stacked manner. The light guide plate 22 is located between the infrared receiving module 10 and the liquid crystal panel 300, the reflective sheet 23 is located between the light guide plate 22 and the infrared receiving module 10, and the reflective sheet 23 is transparent to infrared light. Referring to fig. 3, the light guide plate 22 further includes a first side 223a and a second side 223b opposite to the first side 223a, the first light source 21a is fixed to the light guide plate 22 near the first side 223a, and the second light source 21b is fixed to the light guide plate 22 near the second side 223 b. And the first light source 21a and the second light source 21b each include an infrared light LED211, and the first light source 21a and the second light source 21b each are configured to emit infrared light to the light guide plate 22. The light guide plate 22 further includes a first surface 221 adjacent to the liquid crystal panel 300 and a second surface 222 opposite to the first surface 221. The infrared light enters from the first side 223a and the second side 223b of the light guide plate 22, respectively, and is diffused in the light guide plate 22. Because of the plate-like structure of the light guide plate 22, most of the infrared light is emitted from the first surface 221 and the second surface 222. At this time, the infrared light emitted toward the second surface 222 is reflected by the reflector 23 and emitted from the first surface 221. That is, most of the infrared light emitted from the first light source 21a and the second light source 21b enters the liquid crystal panel 300 through the first surface 221. At this time, when the finger of the user touches the liquid crystal panel 300 and the liquid crystal panel 300 can transmit light, the infrared light entering the liquid crystal panel 300 from the first surface 221 is emitted outward. And the infrared light projected to the user's finger area is re-projected toward the backlight assembly 20 by reflection of the finger. The infrared light passing through the backlight assembly 20 can be received by the infrared receiving assembly 10, the refraction angle and the reflected light brightness of the infrared light on the uneven lines of the fingerprint on the finger surface are different, and at the moment, the infrared light received by the CMOS or CCD on the infrared receiving assembly 10 can form a gray image consisting of ridges and valleys, namely, a black and white alternate line gray image with a certain width and a certain trend in the fingerprint image. The identity recognition function of the user is realized by processing the digitized fingerprint gray level image. What need provide, in this application infrared fingerprint identification module 100, reflection of light piece 23 is not the complete reflection to the reflection of infrared light, and reflection of light piece 23 need possess certain luminousness, just can allow the infrared light to pass through at the in-process that infrared light reflected back backlight unit 20 through the fingerprint to reach infrared receiving assembly 10 department, just can realize this application infrared fingerprint identification module 100's fingerprint identification function. This allows a portion of the infrared light emitted from the first light source 21a and the second light source 21b to pass through the reflector 23 and reach the infrared receiving assembly 10 when the infrared light enters the light guide plate 22. However, the amount of the infrared light passing through the reflective sheet 23 is small, and the infrared light projected to the infrared receiving assembly 10 is relatively uniform, which will not affect the identification process of the infrared receiving assembly 10. Most of the infrared light is projected from the first surface 221 toward the liquid crystal panel 300 and then reflected back into the light guide plate 22 by fingers. At this time, the amount of reflected infrared light is larger than the amount of infrared light transmitted to the infrared receiving assembly 10, the infrared receiving assembly 10 can easily distinguish the infrared light transmitted to the infrared receiving assembly 10 and the infrared light reflected to the infrared receiving assembly 10, and then the infrared receiving assembly 10 performs fingerprint identification on the infrared light reflected and received by the identified part, so that the fingerprint identification function of the infrared fingerprint identification module 100 can be realized.

It should be noted that, in view of the low infrared light transmittance of some backlight module products and lcd products in the market, the first light source 21a and the second light source 21b are arranged to simultaneously emit infrared light to both sides of the light guide plate 22, so as to enhance the energy of the infrared light and facilitate the infrared light transmittance. And the infrared light is simultaneously incident on the two sides of the light guide plate 22, which is beneficial to the uniform distribution of the infrared light in the light guide plate 22 and avoids the defect that the fingerprint identification cannot be realized in partial areas due to the nonuniform distribution of the infrared light.

On the other hand, the liquid crystal panel 300 is normally in a state where visible light is not transmitted in a state where the liquid crystal molecules are arranged in the liquid crystal panel. That is, the electronic device 200 is in a state of blocking the visible light when it is in sleep. Only when the liquid crystal panel 300 starts displaying, the light of the visible light can pass through the liquid crystal panel 300 after the liquid crystal molecules turn. However, the light in the infrared wavelength band is not affected by the arrangement of the liquid crystal molecules, and can pass through the liquid crystal panel 300 in the off-screen or on-screen state. Therefore, the infrared receiving module 10 of the present application can perform fingerprint recognition when the liquid crystal panel 300 displays or turns off the screen, and the normal operation of the liquid crystal panel 300 is not affected. Meanwhile, since the infrared light is invisible light, after the infrared light emitted by the first light source 21a and the second light source 21b is emitted out toward the liquid crystal panel 300 through the backlight assembly 20, the visible display picture of the liquid crystal panel 300 observed by the user is not affected, and therefore, the infrared identification module 100 of the present application does not affect the display of the liquid crystal panel 300 at the same time of increasing the infrared fingerprint identification function.

From this, infrared fingerprint identification module 100 of this application does not need to set up the infrared light emission device who is located the screen below alone because backlight unit 20's setting, just can realize infrared fingerprint identification's function. Meanwhile, the internal space occupied by the infrared light emitting device originally is saved, which is beneficial to the arrangement of the internal devices of the electronic device 200. Simultaneously, through the diffusion effect of light guide plate 22 to the infrared light, the effect region of infrared light has been increased for infrared receiving component 10 can arrange at bigger within range, perhaps corresponds the area that enlarges infrared receiving component 10, or sets up a plurality of infrared receiving component 10, with the fingerprint identification region of extension electron device 200, promotes user experience. Of course, the internal space of the electronic device 200 can be reasonably utilized by the convenience of arranging the infrared receiving module 10 in a wider range. These benefits all contribute to the user experience improvement of the electronic device 200.

In one embodiment, the backlight assembly 20 further includes a bracket 24. The bracket 24 may be a unitary structure or may be formed by joining a plurality of structures. The bracket 24 has an accommodating space 241, and the first light source 21a, the second light source 21b, the light guide plate 22 and the reflective sheet 23 are all accommodated in the accommodating space 241, so that the bracket 24 holds and positions the rest of the backlight assembly 20. The bracket 24 includes a base plate 242, and the base plate 242 is located between the infrared receiving module 10 and the reflector 13. The bottom plate 242 may be made of a metal material to provide a better holding effect for the rest of the backlight assembly 20. The bottom plate 242 is further provided with an opening 243, and the infrared receiving module 10 is disposed opposite to the opening 243, so that the infrared light can be projected onto the infrared receiving module 10 through the opening 243.

Further, the backlight assembly 20 may further include a diffusion sheet 25 and a brightness enhancement sheet 26 for further improving the coverage and effect of the infrared light. The diffusion sheet 25 and the brightness enhancement sheet 26 are both located between the light guide plate 22 and the liquid crystal panel 300, and the diffusion sheet 25 is located between the brightness enhancement sheet 26 and the light guide plate 22.

Referring to fig. 4, the first light source 21a includes a first fixing bar 212a and an infrared LED 211. The second light source 21b also includes a second fixing bar 212b and an infrared LED 211. The first fixing strip 212a is disposed along the first side 223a in the length direction, the second fixing strip 212b is also disposed along the second side 223b in the length direction, the infrared LEDs 211 are respectively fixedly connected to the first fixing strip 223a and the second fixing strip 223b, and the infrared LEDs 211 emit light toward the first side 223a and the second side 223b, so that the infrared light emitted by the infrared LEDs 211 can be projected into the light guide plate 22 from the first side 223a and the second side 223 b. In order to realize a larger infrared light irradiation area, the infrared light LED211 may be provided in plurality, and the plurality of infrared light LEDs 211 are disposed at intervals on the first fixing bar 212a and the second fixing bar 212 b. The infrared light LEDs 211 arranged at intervals can act on a larger range, increasing the area of fingerprint recognition.

The infrared fingerprint identification module 100 can also pertinently set the arrangement position of the infrared light LED211 according to the preset fingerprint identification area. Referring to fig. 5, the first fixing strip 212a is provided with a first section 2121a in the length direction, and the first section 2121a is disposed at a position corresponding to the infrared receiving element 10 in the length direction of the fixing strip 212 a. It can also be described that the projection of the infrared receiving unit 10 in the length direction of the fixing bar 212a corresponds to the first section 2121 a. Accordingly, the second fixing strip 212b is also provided with a second section 2121b corresponding to the position of the infrared receiving unit 10 in the length direction. At this time, the plurality of infrared LEDs 211 are disposed in the first section 2121a and the second section 2121b to ensure that the first light source 21a and the second light source 21b emit infrared light at positions corresponding to the infrared receiving assembly 10, so as to ensure the amount of infrared light reflected onto the infrared receiving assembly 10, thereby improving the identification efficiency of the infrared fingerprint identification module 100. Meanwhile, the infrared LEDs 211 are correspondingly disposed at the first section 2121a and the second section 2121b, that is, only the area with the fingerprint identification function has infrared light incident thereon, and the number and distribution area of the infrared LEDs 211 are reasonably set, so that the cost of the electronic device 200 can be saved. Of course, in an embodiment of a fingerprint identification area corresponding to a larger range, or in an embodiment of enhancing the light amount of the infrared light to ensure the fingerprint identification accuracy, the infrared light LED211 may be disposed outside the first section 2121a and the second section 2121b, which also falls within the technical scope of the infrared fingerprint identification module 100 claimed in the present application.

Referring to fig. 5, the infrared LEDs 211 disposed in the first section 2121a are disposed along the first fixing strip 212a, and the infrared LEDs 211 disposed in the second section 2121b are disposed along the length of the second fixing strip 212b in a staggered manner. The staggered infrared LEDs 211 may supplement each other in the first and second sections 2121a and 2121b, so that the infrared light can be more uniformly and sufficiently projected onto the corresponding region of the infrared receiving assembly 10.

With continued reference to fig. 5, the first light source 21a and/or the second light source 21b further include a visible light LED 213. The visible light LEDs 213 are also fixedly connected to the first fixing bar 212a and/or the second fixing bar 212b, the number of visible light LEDs 213 is also multiple, and the multiple visible light LEDs 213 are also arranged at intervals along the length direction of the first fixing bar 212a and/or the second fixing bar 212b and emit light toward the first side 223a and/or the second side 223b, so that the backlight assembly 20 can simultaneously emit infrared light and visible light to the liquid crystal panel 300. It is understood that the liquid crystal panel 300 requires a backlight to implement the display function. And the liquid crystal panel 300 is generally provided with a backlight device. After the visible light LED213 is added to the backlight assembly 20 of the infrared fingerprint identification module 100, the visible light LED213 can be used as a backlight device of the liquid crystal panel 300 to provide a visible light backlight for the liquid crystal panel 300. Meanwhile, the infrared light source provided by the infrared light LED211 to the infrared receiving assembly 10 enables the backlight assembly 20 to emit both infrared light and visible light, thereby eliminating the necessity of separately providing a backlight device for the liquid crystal panel 300 and providing infrared light for the infrared fingerprint identification module 100, and reasonably integrating the device functions of the electronic device 200. However, depending on the display requirements of the liquid crystal panel 300, the visible light LEDs 213 may be separately disposed on the first fixing bar 212a or the second fixing bar 212b, or the visible light LEDs 213 may be disposed in both the first light source 21a and the second light source 21b, which are embodiments of the claimed electronic device 100.

In one embodiment, the visible light LEDs 213 and the infrared light LEDs 211 at least disposed in the first and second sections 2121a and 2121b are disposed on the first and second fixing bars 212a and 212b at intervals. In order to make the backlight of the liquid crystal panel 300 uniform, the visible light LEDs 213 need to be disposed on the first and/or second fixing bars 212a and 212b at uniform intervals. However, in order to ensure the fingerprint recognition function, the infrared LEDs 211 are also required to be uniformly spaced at least in the first and second sections 2121a and 2121 b. Therefore, the visible light LED213 and the infrared light LED211 are crossed and arranged at intervals, so that the visible light and the infrared light in the same area can be ensured to respectively reach the light quantity required for providing uniform backlight and providing infrared light for fingerprint identification. Further, due to the staggered arrangement of the infrared light LEDs 211 in the first section 2121a and the second section 2121b, the infrared light LEDs 211 can be distributed more substantially uniformly in the corresponding area of the infrared receiving assembly 10. The visible light LEDs 213 are also staggered in this embodiment, so that the visible light LEDs 213 on the first fixing bar 212a and the second fixing bar 212b are staggered, and the visible light in the whole liquid crystal panel 300 is distributed more uniformly.

As mentioned above, the electronic device 200 according to the present application includes the liquid crystal panel 300 and the infrared fingerprint identification module 100. The liquid crystal panel 300 and the infrared fingerprint identification module 100 are fixed by bonding with the optical cement 201. Because the electronic device 200 adopts the infrared fingerprint identification module 100, the internal space utilization rate of the electronic device 200 can be improved, and meanwhile, the electronic device 200 can realize the function of fingerprint identification under the screen, and the identification area of the fingerprint under the screen is larger than that under the existing screen, so that the electronic device can be flexibly arranged at any position of the screen of the electronic device 200.

Referring to fig. 6, the liquid crystal panel 300 includes an upper polarizer 310, a liquid crystal layer 320, and a lower polarizer 330. The lower polarizer 330 is located between the upper polarizer 310 and the infrared fingerprint identification module 100, and the liquid crystal layer 320 is located between the upper polarizer 310 and the lower polarizer 330. The arrangement of the upper polarizer 310 and the lower polarizer 320 is helpful to filter the ambient light at the liquid crystal panel 300, eliminate the influence of the incident of the ambient light through the liquid crystal panel 300 on the infrared receiving assembly 10, and ensure the identification accuracy of the infrared fingerprint identification module 100.

It should be noted that, in the electronic device 200 of the present application, the film structure with functions of polarization, diffusion, enhancement, etc. needs to have high transmittance and action capability in both the infrared light band and the visible light band, so as to simultaneously achieve the backlight effect of visible light and the projection and reflection effect of infrared light. The optical film with a wide wavelength range gradually appears in the market, which is the basis for realizing the functions of the infrared fingerprint identification module 100.

In one embodiment, a protective glass 340 is further disposed on the liquid crystal panel 300 in order to protect the liquid crystal panel 300. The protection glass 340 is located on the light-emitting side of the liquid crystal panel 300, that is, the protection glass 340 is located on the side of the liquid crystal panel 300 away from the infrared fingerprint identification module 100. The protective glass 340 is bonded to the upper polarizer 310 by the optical adhesive 201. It can be understood that the protective glass 340 and the optical adhesive 201 both need to have high light transmittance, and the wavelength range of the applied light needs to include infrared light and visible light, so as to implement the functions of the electronic device 200 of the present application. The finger of the user contacts the protection glass 340, and reflects the infrared light to the infrared fingerprint recognition module 100 for identity authentication. The protection glass 340 may perform a sealing protection on the upper polarizer 310, the liquid crystal layer 320, and the like, so as to prevent impurities or moisture from entering the liquid crystal panel 300 or the infrared fingerprint recognition module 100 and damaging the internal structure of the electronic device 200.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims (11)

1. An infrared fingerprint identification module is arranged below a liquid crystal panel of an electronic device and is characterized in that the infrared fingerprint identification module comprises an infrared receiving assembly and a backlight assembly, the backlight assembly comprises a first light source, a second light source, a light guide plate and a reflecting sheet, the light guide plate is arranged between the infrared receiving assembly and the liquid crystal panel, the reflecting sheet is arranged between the light guide plate and the infrared receiving assembly, the reflecting sheet can penetrate infrared light, the light guide plate comprises a first side edge and a second side edge opposite to the first side edge, the first light source is fixed at the position, close to the first side edge, of the light guide plate, the second light source is fixed at the position, close to the second side edge, of the light guide plate, the first light source and the second light source are used for emitting infrared light to the light guide plate towards the side edges, and the infrared light enters the liquid crystal panel from the side, far away from the, when a finger of a user touches the liquid crystal panel, the infrared receiving component is used for receiving infrared light reflected by the finger to realize a fingerprint identification function.

2. The infrared fingerprint recognition module of claim 1, wherein the backlight assembly further comprises:

the bracket comprises an accommodating space, and the first light source, the second light source, the light guide plate and the reflective sheet are accommodated in the accommodating space;

the bottom plate is located between the infrared receiving assembly and the reflective sheet, the bottom plate is provided with an opening, and the infrared receiving assembly is right opposite to the opening so that the infrared receiving assembly receives infrared light passing through the opening.

3. The infrared fingerprint identification module of claim 2, wherein the backlight assembly further comprises a diffusion sheet and a brightness enhancement sheet, the diffusion sheet and the brightness enhancement sheet are both located between the light guide plate and the liquid crystal panel, and the diffusion sheet is located between the brightness enhancement sheet and the light guide plate.

4. The infrared fingerprint identification module of any one of claims 1 to 3, wherein the first light source comprises a first fixing strip, the second light source comprises a second fixing strip, the first fixing strip is arranged along the first side edge in the length direction, the second fixing strip is arranged along the second side edge in the length direction, the first light source and the second light source further comprise infrared LEDs, the infrared LEDs are fixedly connected with the first fixing strip and the second fixing strip, the infrared LEDs emit light towards the first side edge and the second side edge, the infrared LEDs are multiple, and the infrared LEDs are arranged on the first fixing strip and the second fixing strip at intervals.

5. The infrared fingerprint recognition module of claim 4, wherein the first fixing strip has a first section along a length direction, the first section is disposed corresponding to the infrared receiving assembly along the length direction of the first fixing strip, the second fixing strip has a second section along the length direction, the second section is also disposed corresponding to the infrared receiving assembly along the length direction of the second fixing strip, and the plurality of infrared LEDs are disposed at least in the first section and the second section to ensure an amount of infrared light reflected onto the infrared receiving assembly.

6. The infrared fingerprint identification module of claim 5, wherein the infrared light LEDs disposed in the first section are staggered from the infrared light LEDs disposed in the second section along a length of the first fixing strip.

7. The infrared fingerprint identification module of claim 5, wherein the first light source and/or the second light source further comprises a plurality of visible light LEDs, the visible light LEDs are also fixedly connected with the first fixing strip and/or the second fixing strip, and the plurality of visible light LEDs are arranged on the first fixing strip and/or the second fixing strip at intervals along the length direction of the first fixing strip and emit light towards the first side and/or the second side, so that the backlight assembly can simultaneously emit infrared light and visible light to the liquid crystal panel.

8. The infrared fingerprint recognition module of claim 7, wherein the visible light LEDs and the infrared light LEDs disposed at least in the first section and the second section are disposed on the first fixing strip and the second fixing strip at a distance from each other.

9. An electronic device, comprising a liquid crystal panel, wherein the electronic device further comprises the infrared fingerprint identification module set according to any one of claims 1 to 8, and the liquid crystal panel and the infrared fingerprint identification module set are fixed by optical adhesive.

10. The electronic device of claim 9, wherein the liquid crystal panel comprises an upper polarizer, a liquid crystal layer, and a lower polarizer, the lower polarizer is located between the upper polarizer and the infrared fingerprint identification module, and the liquid crystal layer is located between the upper polarizer and the lower polarizer.

11. The electronic device according to claim 10, wherein the liquid crystal panel further comprises a protective glass, the protective glass is located on one side of the liquid crystal panel away from the infrared fingerprint identification module, and the protective glass is bonded to the upper polarizer through the optical adhesive.

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