WO2021012259A1

WO2021012259A1 - Under-screen fingerprint identification module, lcd optical fingerprint identification system, and electronic device

Info

Publication number: WO2021012259A1
Application number: PCT/CN2019/097696
Authority: WO
Inventors: 李顺展
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-07-25
Filing date: 2019-07-25
Publication date: 2021-01-28
Also published as: CN111095274A; CN111095274B

Abstract

The present application provides an under-screen fingerprint identification module, an LCD optical fingerprint identification system, and an electronic device. The under-screen fingerprint identification module provided in the present application is applied to the LCD optical fingerprint identification system provided with a backlight module, and comprises a fingerprint sensor and a transmitting unit. The transmitting unit is configured to receive reflected light generated by a fingerprint and focus the reflected light onto a sensing area of the fingerprint sensor; the fingerprint sensor is configured to convert the reflected light into an electrical signal, and the electrical signal is used for generating a fingerprint image; a field angle of the transmitting unit is greater than a preset angle, and the field angle is a minimum included angle between boundary light determined by taking the transmitting unit as a vertex and the boundary of the sensing area as a boundary and a vertical direction. The fingerprint identification module provided in the present application can ensure the integrity of the fingerprint image, so that the under-screen fingerprint identification process can be smoothly completed.

Description

Under-screen fingerprint recognition module, LCD optical fingerprint recognition system and electronic equipment

Technical field

This application relates to the field of fingerprint identification technology, and in particular to an under-screen fingerprint identification module, LCD optical fingerprint identification system and electronic equipment.

Background technique

With the development of technology, full screens have gradually become the mainstream design elements of current electronic devices, especially smart phones, and liquid crystal display (LCD) screens equipped with under-screen fingerprint recognition will have a place in the display field.

1 is a schematic structural diagram of an LCD optical fingerprint identification system equipped with an under-screen fingerprint identification module in the prior art. As shown in FIG. 1, the LCD optical fingerprint identification system sequentially includes an LCD liquid crystal panel 100, a backlight module 200, and an under-LCD fingerprint identification module 300 from top to bottom. Wherein, the LCD liquid crystal panel 100 includes a glass cover 101 and a liquid crystal layer 102 from top to bottom. The backlight module 200 includes a first prism film 201, a second prism film 202, a diffusion film 203, Light guide plate 204, reflective film 105 and steel plate 106. Among them, the function of the two-layer prism film is to use the principle of refraction and total reflection to concentrate the scattered light at a certain angle and emit it from the backlight. The fingerprint recognition module 300 under the LCD screen includes a lens and an optical sensor from top to bottom. The lens is used to receive the reflected light generated by the fingerprint and focus the reflected light on the optical sensor. The optical sensor is used to convert the reflected light into The electrical signal is transmitted to the processor, so that the processor generates a fingerprint image according to the electrical signal.

However, due to the existence of the prism film, the fingerprint image may be segmented from the middle, which affects the integrity of the fingerprint image and makes the fingerprint identification process difficult to complete.

Application content

This application provides an under-screen fingerprint identification module, LCD optical fingerprint identification system, and electronic equipment to ensure the integrity of the fingerprint image, so that the under-screen fingerprint identification process can be completed smoothly.

In the first aspect, the present application provides an under-screen fingerprint identification module, which is applied to an LCD optical fingerprint identification system with a backlight module. The under-screen fingerprint identification module includes a fingerprint sensor and a transmission unit;

The transmission unit is used to receive the reflected light generated by the fingerprint and focus the reflected light on the sensing area of the fingerprint sensor. The fingerprint sensor is used to convert the reflected light into an electrical signal. Used to generate fingerprint images;

The field angle of the transmission unit is greater than a preset angle, wherein the field angle is the angle between the light incident on the sensing area and the vertical direction.

In a possible design, the transmission unit is arranged in parallel between the prism film and the fingerprint sensor;

The projection of the transmission unit in the vertical direction is deviated from the center position of the sensing area of the fingerprint sensor, and the direction of the projection deviation is the first direction;

The angle of view is the angle between the vertical direction and the light radiated to the sensing area through the transmission unit.

In a possible design, the fingerprint recognition module under the screen further includes: a reflection unit;

The reflecting unit has a reflecting surface, and the reflecting surface is configured to face the prism film;

The transmission unit is located between the prism film and the reflection unit to transmit the reflected light to the reflection surface of the reflection unit through the transmission unit, and is reflected again by the reflection surface Focus on the sensing area of the fingerprint sensor;

The field of view angle is the angle between the vertical direction and the light radiated to the sensing area after being reflected by the reflecting unit.

In a possible design, the preset angle is 35 degrees.

In a possible design, the prism film is a single film layer.

In a possible design, the under-screen fingerprint recognition module further includes: a fingerprint light source;

The fingerprint light source is arranged on the liquid crystal panel of the LCD optical fingerprint identification system, so that the light emitted by the fingerprint light source passes through the ink layer and is emitted to the fingerprint field of view through the glass cover, so that the fingerprint is generated The reflected light, wherein the liquid crystal panel includes the glass cover plate, and the ink layer is disposed on the lower side of the glass cover plate; and/or

The fingerprint light source is arranged on a steel plate of the backlight module, and the steel plate is provided with an opening for emitting light from the fingerprint light source, so that the light emitted by the fingerprint light source passes through the backlight module and the The liquid crystal panel is projected to the fingerprint field of view, so that the fingerprint generates the reflected light.

In a possible design, the fingerprint light source is an infrared light source.

In a possible design, a filter is further provided on the sensing area of the fingerprint sensor, and the filter is used to cut off light of other wavelength bands except infrared light.

In the second aspect, the present application also provides an LCD optical fingerprint identification system, including: a liquid crystal panel, a backlight module, and any under-screen fingerprint identification module as in the first aspect;

The backlight module is arranged on the lower side of the liquid crystal panel, and the under-screen fingerprint recognition module is arranged on the lower side of the backlight module.

In the third aspect, the present application also provides an electronic device, including: a processor and the LCD optical fingerprint identification system provided in the second aspect;

The processor is electrically connected to the LCD optical fingerprint identification system.

In the under-screen fingerprint recognition module, LCD optical fingerprint recognition system and electronic equipment provided in this application, after the field angle of the transmission unit is greater than the preset angle, the reflected light generated by the fingerprint can penetrate the single-layer prism film and enter the transmission unit. And make the transmission unit focus the reflected light on the sensing area of the fingerprint sensor, and convert the reflected light into an electrical signal through the fingerprint sensor to generate a fingerprint image for fingerprint recognition under the screen, and the generated fingerprint image will not exist The phenomenon of being segmented from the middle ensures the integrity of the fingerprint image and promotes the smooth completion of the fingerprint identification process.

Description of the drawings

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 These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor.

1 is a schematic diagram of the structure of an LCD optical fingerprint identification system equipped with an under-screen fingerprint identification module in the prior art;

2 is a partial schematic diagram of a prism film and a prism film provided by an embodiment of the application;

FIG. 3 is a schematic diagram of a fingerprint image provided by an embodiment of the application;

4 is a schematic diagram of an under-screen fingerprint identification module provided by an embodiment of the application;

FIG. 5 is a schematic diagram of a fingerprint image provided by an embodiment of the application;

6 is a schematic diagram of an under-screen fingerprint identification module provided by another embodiment of the application;

FIG. 7 is a schematic diagram of an LCD optical fingerprint identification system provided by an embodiment of the application;

8 is a schematic diagram of an LCD optical fingerprint identification system provided by another embodiment of the application;

FIG. 9 is a schematic diagram of an LCD optical fingerprint identification system provided by still another embodiment of the application;

FIG. 10 is a schematic flowchart of an off-screen fingerprint registration method provided by an embodiment of this application;

FIG. 11 is a schematic flowchart of an off-screen fingerprint identification method provided by an embodiment of this application.

Through the above-mentioned drawings, the specific embodiments of the present disclosure have been shown, which will be described in more detail below. The drawings and text description are not intended to limit the scope of the concept of the present disclosure in any way, but to explain the concept of the present disclosure for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, 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.

The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein, for example, can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

Continuing to refer to FIG. 1, the LCD optical fingerprint recognition system includes, from top to bottom, an LCD liquid crystal panel 100, a backlight module 200, and an under-LCD fingerprint recognition module 300. Wherein, the LCD liquid crystal panel 100 includes a glass cover 101 and a liquid crystal layer 102 from top to bottom. The backlight module 200 includes a first prism film 201, a second prism film 202, a diffusion film 203, Light guide plate 204, reflective film 105 and steel plate 106. Among them, the function of the two-layer prism film is to use the principle of refraction and total reflection to concentrate the scattered light at a certain angle and emit it from the backlight. The fingerprint recognition module 300 under the LCD screen includes a lens and an optical sensor from top to bottom. The lens is used to receive the reflected light generated by the fingerprint and focus the reflected light on the optical sensor. The optical sensor is used to convert the reflected light into The electrical signal is transmitted to the processor, so that the processor generates a fingerprint image according to the electrical signal.

Among them, the above-mentioned prism film specification is usually 90/50, that is, the prism angle is 90 degrees, and the prism period is 50 microns. The so-called prism period refers to the distance between two adjacent prism peaks. Specifically, FIG. 2 is a partial schematic diagram of a prism film and a prism film provided by an embodiment of the application. As shown in FIG. 2, the upper part is a prism film, and the lower part is a partial schematic diagram of the prism film. Angle B is the prism angle, which may be equal to 90 degrees, d is the prism period. Because the prism film structure restricts light from a small angle from entering the optical sensor, for example, as shown in Figure 2, according to the law of total reflection, the incident light rays that are basically parallel to the prism can form vertical outgoing light rays to reach the optical sensor. It is difficult to realize the incident light of parallel prisms. Therefore, it is not realistic to form a vertical outgoing light. As shown in Figure 3, this phenomenon causes the fingerprint image to be divided from the middle, which affects the integrity of the fingerprint image, and then Makes the fingerprint recognition process difficult to complete.

In order to solve the above technical problems, this application provides an under-screen fingerprint recognition module. The embodiments of the present application will be described below in conjunction with the drawings. It is worth noting that the following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

4 is a schematic diagram of an under-screen fingerprint identification module provided by an embodiment of the application. As shown in FIG. 4, the under-screen fingerprint identification module provided in this embodiment is applied to an LCD optical fingerprint identification system with a backlight module, where the under-screen fingerprint identification module includes a fingerprint sensor 304 and a transmission unit 303. The transmission unit 303 is used for receiving the reflected light generated by the fingerprint and focusing the reflected light on the sensing area 3041 of the fingerprint sensor 304. The fingerprint sensor 304 is used for converting the reflected light into an electrical signal, and the electrical signal is used for generating a fingerprint image. In addition, the field of view A of the transmission unit 303 is greater than a preset angle, where the field of view A is the angle between the light incident on the sensing area and the vertical direction. For example, the foregoing preset angle may be 35 degrees. It can also be any value between 35 degrees and 80 degrees.

4, the transmission unit 303 is arranged in parallel between the fingerprint sensor 304 and the prism film of the backlight module, but the projection of the transmission unit 303 in the vertical direction deviates from the center position of the sensing area of the fingerprint sensor 304. It should be understood that the vertical line of the center of the transmission unit 303 may be offset from the center line of the sensing area 3041 of the fingerprint sensor 304 by a certain distance to the left or right. The specific deviation distance may be based on the fingerprint identification module under the screen. The specific size is determined, but it needs to be ensured that the deviation distance can make the above-mentioned field angle A greater than 35 degrees.

In addition, the under-screen fingerprint recognition module provided in this embodiment further includes: a substrate 301, and a bracket 302 arranged on the substrate 301 to form an accommodating space, wherein a fingerprint sensor 304 is arranged in the accommodating space. In addition, the above-mentioned transmission unit 303 may be arranged on the side wall of the bracket 302 opposite to the substrate 301 so as to be opposite to the sensing area 3041 on the fingerprint sensor 304.

Optionally, the transmission unit 303 may be an optical imaging element, and may also be called a lens. The transmission unit 303 may have a spherical or aspheric optical transmission structure for focusing the reflected light. The transmission unit 303 may be one lens or a structure composed of multiple lenses. In addition, the lens of the transmission unit 303 may generally be formed of a resin material or a glass material.

Optionally, the aforementioned fingerprint sensor 304 may also be referred to as an optical sensor, an image sensor, an optical fingerprint sensor, an optical sensor, or a fingerprint detection sensor.

It should be noted that the projection of the transmission unit 303 in the vertical direction is located in the central area of the fingerprint sensor 304 in the prior art. As shown in Figure 3, this phenomenon causes the fingerprint image to be divided from the middle. However, FIG. 5 is a schematic diagram of a fingerprint image provided by an embodiment of the application. As shown in FIG. 5, the projection of the transmission unit 303 in the vertical direction is located in the central area of the fingerprint sensor 304. When the transmission unit 303 is in the vertical direction The above projection deviates from the center area of the fingerprint sensor 304, so that when the field of view A is greater than the preset angle, the final generated fingerprint image as shown in FIG. 5 can eliminate the phenomenon that the fingerprint image is divided from the middle.

In this embodiment, after the field angle of the transmission unit is greater than the preset angle, the reflected light generated by the fingerprint can penetrate the single-layer prism film into the transmission unit, and the transmission unit can focus the reflected light to the sensing area of the fingerprint sensor In the above, the reflected light is converted into electrical signals through the fingerprint sensor to generate fingerprint images for under-screen fingerprint recognition, and the generated fingerprint images will not be segmented in the middle, thus ensuring the integrity of the fingerprint image And promote the smooth completion of the fingerprint identification process.

FIG. 5 is a schematic diagram of a fingerprint image provided by an embodiment of the application. As shown in FIG. 5, the under-screen fingerprint identification module provided by this embodiment is applied to an LCD optical fingerprint identification system with a backlight module. The under-screen fingerprint identification module includes a fingerprint sensor 304, a transmission unit 303, and a reflective Unit 305. The transmission unit 303 is used for receiving the reflected light generated by the fingerprint and focusing the reflected light on the sensing area 3041 of the fingerprint sensor 304. The fingerprint sensor 304 is used for converting the reflected light into an electrical signal, and the electrical signal is used for generating a fingerprint image. In addition, the field of view A of the transmission unit 303 is greater than a preset angle, where the field of view A is the angle between the light incident on the sensing area and the vertical direction. For example, the foregoing preset angle may be 35 degrees. It can also be any value between 35 degrees and 80 degrees.

5, the above-mentioned reflection unit 305 has a reflection surface, wherein the reflection surface is used to face the prism film of the backlight module, and the transmission unit 303 is located between the prism film and the reflection unit 305 to transmit the reflected light through The unit 303 is transmitted to the reflective surface of the reflective unit 305, and is focused on the sensing area 3041 of the fingerprint sensor 304 after being reflected again by the reflective surface. The above-mentioned field of view is the light reflected by the reflective unit and hitting the sensing area. The angle between the vertical directions.

In addition, the under-screen fingerprint recognition module provided in this embodiment further includes: a substrate 301, and a bracket 302 arranged on the substrate 301 to form an accommodating space, wherein a fingerprint sensor 304 is arranged in the accommodating space. In addition, the above-mentioned transmission unit 303 may be disposed on the sidewall of the substrate 301 adjacent to the bracket 302. The optical axis of the transmission unit 303 may be perpendicular to the optical axis of the reflection unit 305. Of course, the optical axis of the transmission unit 303 may not be perpendicular to the optical axis of the reflection unit 305, for example, it may be close to vertical. The optical axis of the transmissive unit 303 is perpendicular to the optical axis of the reflective unit 305, so that the light transmitted by the transmissive unit 303 is incident on the reflective surface of the reflective unit 305 as much as possible, avoiding the omission of light, and ensuring the clarity and integrity of the fingerprint image Therefore, the accuracy of fingerprint detection under the screen is further ensured.

It should be noted that the projection of the transmission unit 303 in the vertical direction is located in the central area of the fingerprint sensor 304 in the prior art. As shown in Figure 3, this phenomenon causes the fingerprint image to be divided from the middle. However, FIG. 5 is a schematic diagram of a fingerprint image provided by an embodiment of the application. As shown in FIG. 5, the projection of the transmission unit 303 in the vertical direction is located in the central area of the fingerprint sensor 304. When the transmission unit 303 is disposed on the fingerprint sensor The side wall of 304 is such that when the field of view A is greater than the preset angle, the final generated fingerprint image as shown in FIG. 5 can eliminate the phenomenon that the fingerprint image is divided from the middle.

In addition, on the basis of the above-mentioned embodiments, in order to increase the brightness of the backlight module to compensate for the dimming of the display brightness caused by the single-layer prism film, a fingerprint light source can also be provided, wherein the fingerprint light source can be an infrared light source. If the infrared light source can be an infrared light source with a wavelength of 940 nm. The infrared light source may be, for example, an infrared LED light source, an infrared vertical cavity surface emitting laser (VCSEL for short), an infrared laser diode (Laser Diode), and the like.

Optionally, if the fingerprint light source 21 is an infrared light source, in order to avoid the interference of visible light on fingerprint detection, continue to refer to FIGS. 4 and 6, a filter 3042 can also be provided on the sensing area 3041 of the fingerprint sensor 304, wherein the filter 3042 is used to cut off light in other wavelength bands except infrared light, that is, the filter 3042 can only transmit infrared light with a wavelength of 940±25 nm.

By setting the fingerprint light source as an infrared light source, the fingerprint reflected light for fingerprint recognition under the screen can be made infrared light, thereby avoiding the interference of the fingerprint reflected light on the visible light source used to display, ensuring the display effect of the display module; The visible light source interferes with the fingerprint reflected light, effectively ensuring the accuracy of fingerprint detection under the screen.

In addition, the position of the fingerprint light source 21 can be set on the liquid crystal panel of the LCD optical fingerprint recognition system, or it can be set on the steel plate by punching holes in the steel plate of the backlight module. In this embodiment, it is not correct. The location of the fingerprint light source 21 is specifically limited. It is only necessary to ensure that the light emitted by the fingerprint light source 21 can be set to the fingerprint field of view area of the liquid crystal panel.

FIG. 7 is a schematic diagram of an LCD optical fingerprint identification system provided by an embodiment of the application. As shown in FIG. 7, the LCD optical fingerprint identification system provided by this embodiment includes: a liquid crystal panel 100, a backlight module 200, and the under-screen fingerprint identification module 300 provided in any of the above embodiments. The backlight module 200 is arranged on the lower side of the liquid crystal panel 100, and the under-screen fingerprint recognition module 300 is arranged on the lower side of the backlight module 200.

Specifically, the liquid crystal panel 100 includes a glass cover 101 and a liquid crystal layer 102 from top to bottom. The backlight module 200 includes a prism film 201, a diffusion film 203, a light guide plate 204, a reflective film 105, and a steel plate from top to bottom. 106.

In order to increase the brightness of the backlight module 200 and compensate for the dimming of the display brightness caused by the single-layer prism film 201, a fingerprint light source 400 may also be provided, wherein the fingerprint light source 400 may be an infrared light source.

The fingerprint light source 400 can be arranged on the liquid crystal panel 100 of the LCD optical fingerprint recognition system. For example, the ink layer 1021 under the glass cover 101 can be arranged adjacent to the liquid crystal wiring area 1022, so that the fingerprint light source 400 emits light After passing through the ink layer 1021, it is emitted to the fingerprint field of view through the glass cover 101, so that the fingerprint generates reflected light.

In another possible design, FIG. 8 is a schematic diagram of an LCD optical fingerprint identification system provided by another embodiment of the application. As shown in FIG. 8, the fingerprint light source 400 can also be arranged on the steel plate 106 of the backlight module 200, so that the light emitted by the fingerprint light source 400 passes through the backlight module 200 and the liquid crystal panel 100 and is emitted to the fingerprint field of view area. Fingerprints produce reflected light.

In addition, FIG. 9 is a schematic diagram of an LCD optical fingerprint identification system provided by another embodiment of the application. As shown in FIG. 9, it can also be on the LCD panel 100 of the LCD optical fingerprint identification system and the steel plate 106 of the backlight module 200. The fingerprint light source 400 is installed.

In this embodiment, after the field angle of the transmission unit is greater than the preset angle, the reflected light generated by the fingerprint can penetrate the single-layer prism film into the transmission unit, and the transmission unit can focus the reflected light to the sensing area of the fingerprint sensor In the above, the reflected light is converted into electrical signals through the fingerprint sensor to generate fingerprint images for under-screen fingerprint recognition, and the generated fingerprint images will not be segmented in the middle, thus ensuring the integrity of the fingerprint image In addition, only a single-layer prism film needs to be provided. Compared with the two-layer prism film in the prior art, the manufacturing cost of the LCD optical fingerprint recognition system can be reduced.

In addition, the present application also provides an electronic device including a processor and the LCD optical fingerprint identification system provided in any of the above embodiments, wherein the processor is electrically connected to the LCD optical fingerprint identification system.

The LCD optical fingerprint identification system may also include a pressure sensor, and the pressure sensor is used to sense the pressure of the touch input signal on the LCD optical fingerprint identification system. The processor is used for receiving the pressure signal sensed by the pressure sensor and used for processing the pressure signal, for example, triggering an application in the electronic device based on the pressure signal.

In addition, the electronic device may also include a memory. The memory can be used to store instruction information, and can also be used to store codes and instructions executed by the processor. Among them, the processor can call and run a computer program from the memory to realize the fingerprint registration and identification method under the screen.

Among them, the memory can be a separate device independent of the processor, or can be integrated in the processor.

The electronic device can be any device with a fingerprint recognition function under the LCD screen, such as a smart phone, a notebook computer, a wearable device, and a household appliance.

In addition, the following describes the process of under-screen fingerprint recognition using the above electronic equipment:

FIG. 10 is a schematic flowchart of an off-screen fingerprint registration method provided by an embodiment of this application. As shown in Figure 10, the off-screen fingerprint registration method provided in this embodiment includes:

Step 501: Obtain a fingerprint recognition registration instruction.

Step 502: Switch to the fingerprint registration interface.

Step 503: Enter the fingerprint collection mode.

Step 504: Obtain a pressing instruction in the fingerprint area.

Step 505: Turn on the fingerprint light source.

Step 506: Collect a fingerprint image.

Step 507: Preprocess the fingerprint image.

Step 508: Determine whether the processed image meets the condition. If the judgment result is yes, then step 509 is executed; if the judgment result is no, step 506 is executed.

Step 509: Turn off the fingerprint light source.

Step 510: Perform feature extraction on the fingerprint image.

Step 511: Register the fingerprint image according to the extracted features.

Step 512: Determine whether the number of fingerprint images entered meets the condition. If the judgment result is yes, then step 513 is executed, and if the judgment result is no, step 503 is executed.

Step 513: Save the fingerprint template.

Step 514: Output the registration success information on the interface.

FIG. 11 is a schematic flowchart of an off-screen fingerprint identification method provided by an embodiment of this application. As shown in FIG. 11, the off-screen fingerprint identification method provided in this embodiment includes:

Step 601: Obtain a fingerprint identification unlocking instruction.

Step 602: Enter the fingerprint collection mode.

Step 603: Obtain a pressing instruction in the fingerprint area.

Step 604: Turn on the fingerprint light source.

Step 605: Collect a fingerprint image.

Step 606: Preprocess the fingerprint image.

Step 607: Perform feature extraction on the fingerprint image.

Step 608: Whether the fingerprint image is matched successfully. If the judgment result is yes, then step 610 is executed; if the judgment result is no, step 606 is executed.

Step 609: Continue to obtain a pressing instruction in the fingerprint area. If the result of the judgment is yes, step 604 is executed, and if the result of the judgment is no, step 611 is executed.

Step 610: The fingerprint template is updated.

Step 611: The fingerprint identification is successful.

Step 612: Save the fingerprint template.

Those skilled in the art will easily think of other embodiments of the present disclosure after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptive changes of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not disclosed in the present disclosure . The description and the embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

It should be understood that the present disclosure is not limited to the precise structure that has been described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

An under-screen fingerprint identification module, applied to an LCD optical fingerprint identification system with a backlight module, characterized in that the under-screen fingerprint identification module includes: a fingerprint sensor and a transmission unit;

The transmission unit is used to receive the reflected light generated by the fingerprint and focus the reflected light on the sensing area of the fingerprint sensor. The fingerprint sensor is used to convert the reflected light into an electrical signal. Used to generate fingerprint images;

The field angle of the transmission unit is greater than a preset angle, wherein the field angle is the angle between the light incident on the sensing area and the vertical direction.
The under-screen fingerprint recognition module according to claim 1, wherein the transmission unit is arranged in parallel between the prism film and the fingerprint sensor;

The projection of the transmission unit in the vertical direction deviates from the center position of the sensing area of the fingerprint sensor;

The angle of view is the angle between the vertical direction and the light radiated to the sensing area through the transmission unit.
The under-screen fingerprint recognition module according to claim 1, further comprising: a reflection unit;

The reflecting unit has a reflecting surface, and the reflecting surface is configured to face the prism film;

The transmission unit is located between the prism film and the reflection unit to transmit the reflected light to the reflection surface of the reflection unit through the transmission unit, and is reflected again by the reflection surface Focus on the sensing area of the fingerprint sensor;

The field of view angle is the angle between the vertical direction and the light radiated to the sensing area after being reflected by the reflecting unit.
The under-screen fingerprint identification module according to any one of claims 1 to 3, wherein the predetermined angle is 35 degrees.
The under-screen fingerprint recognition module according to claim 4, wherein the prism film is a single film layer.
The under-screen fingerprint identification module of claim 5, further comprising: a fingerprint light source;

The fingerprint light source is arranged on the liquid crystal panel of the LCD optical fingerprint identification system, so that the light emitted by the fingerprint light source passes through the ink layer and is emitted to the fingerprint field of view through the glass cover, so that the fingerprint is generated The reflected light, wherein the liquid crystal panel includes the glass cover plate, and the ink layer is disposed on the lower side of the glass cover plate; and/or

The fingerprint light source is arranged on a steel plate of the backlight module, and the steel plate is provided with an opening for emitting light from the fingerprint light source, so that the light emitted by the fingerprint light source passes through the backlight module and the The liquid crystal panel is projected to the fingerprint field of view, so that the fingerprint generates the reflected light.
The under-screen fingerprint recognition module of claim 6, wherein the fingerprint light source is an infrared light source.
The under-screen fingerprint identification module according to claim 7, wherein the sensing area of the fingerprint sensor is further provided with a filter, and the filter is used to cut off other wavelengths except infrared light. Light.
An LCD optical fingerprint identification system, characterized by comprising: a liquid crystal panel, a backlight module, and the under-screen fingerprint identification module according to any one of claims 1-8;

The backlight module is arranged on the lower side of the liquid crystal panel, and the under-screen fingerprint recognition module is arranged on the lower side of the backlight module.
An electronic device, comprising: a processor and the LCD optical fingerprint identification system according to claim 9;

The processor is electrically connected to the LCD optical fingerprint identification system.