WO2021087741A1

WO2021087741A1 - Under-screen fingerprint recognition apparatus, lcd fingerprint recognition system, and electronic device

Info

Publication number: WO2021087741A1
Application number: PCT/CN2019/115698
Authority: WO
Inventors: 曾凡洲; 熊峰
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2021-05-14
Also published as: CN111066031A; CN111066031B

Abstract

The present application provides an under-screen fingerprint recognition apparatus, an LCD fingerprint recognition system, and an electronic device. The under-screen fingerprint recognition apparatus is applied to the electronic device having a liquid crystal display screen and a middle frame. A fingerprint detection area of the under-screen fingerprint recognition apparatus is located at least partially in a display area of the liquid crystal display screen. The under-screen fingerprint recognition apparatus comprises a detection light source assembly, and a fingerprint recognition module located below the liquid crystal display screen. The detection light source assembly is used for being obliquely provided on the middle frame and located below the edge area of the liquid crystal display screen, so as to emit detection light to the fingerprint detection area. The detection light irradiates a finger above the fingerprint detection area and is reflected by the finger to form fingerprint detection light carrying fingerprint information, and the fingerprint recognition module is used for receiving the fingerprint detection light transmitting through a light transmission area to obtain a fingerprint image of the finger, so that under-screen fingerprint recognition of the electronic device using the LCD screen is achieved.

Description

Under-screen fingerprint identification device, LCD fingerprint identification 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 device, LCD fingerprint identification system and electronic equipment.

Background technique

Smart phones have entered the era of full-screen, and the screen-to-body ratio of mobile phones has become larger and larger, and under-screen fingerprint recognition technology has become a trend.

At present, the fingerprint technology under the optical screen of Organic Light-Emitting Diode (OLED) screen mobile phones has entered the commercial era. Mobile phones with OLED screens use OLED screen pixels to emit light as the light source. The light irradiates the finger to form fingerprint detection light and returns to the OLED screen, which is received by the optical fingerprint sensor below the screen to achieve fingerprint image collection and fingerprint recognition. Due to the high cost of OLED screens, the price of mobile phones using OLED screens is also high. Liquid Crystal Display (LCD) screens have many advantages such as thin body, power saving, and no radiation, and are widely used in electronic products such as TVs, computers, and mobile phones.

However, the existing electronic products do not use the LCD screen to realize the function of fingerprint recognition under the screen.

Summary of the invention

This application provides an under-screen fingerprint identification device, LCD fingerprint identification system, and electronic equipment to solve the problem that existing electronic products do not use LCD screens to realize under-screen fingerprint identification.

In the first aspect, the present application provides an under-screen fingerprint identification device, which is applied to an electronic device with a liquid crystal display screen and a middle frame. 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 ；

The under-screen fingerprint identification device includes a detection light source assembly and a fingerprint identification module located under the liquid crystal display screen; the detection light source assembly is arranged in an oblique manner in the middle frame and located at the bottom of the liquid crystal display screen. Below the edge area, to emit detection light to the fingerprint detection area; the detection light irradiates the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information, and the fingerprint recognition module is used to receive the fingerprint detection area. Passing through the fingerprint detection light of the liquid crystal display screen to obtain a fingerprint image of the finger.

In a specific embodiment of the present application, the liquid crystal display screen includes a backlight module, the light-transmitting area for transmitting the fingerprint detection light is formed on the backlight module, and the fingerprint recognition module The group is located under the light-transmitting area of the backlight module, so that the fingerprint detection light is transmitted to the fingerprint identification module through the backlight module.

In a specific embodiment of the present application, the detection light or the fingerprint detection light and the backlight provided by the backlight module for displaying images have different wavelengths.

In a specific embodiment of the present application, the detection light and/or the fingerprint detection light are infrared light, and the backlight provided by the backlight module is visible light.

In a specific embodiment of the present application, the liquid crystal display screen includes a liquid crystal panel and a protective cover plate located on the liquid crystal panel, and the detection light source assembly is located below the edge area of the protective cover plate. One side of the backlight module.

In a specific embodiment of the present application, the detection light source assembly is obliquely arranged in the frame of the middle frame, and the included angle between the detection light source assembly and the liquid crystal display screen is 30°-60°.

In a specific embodiment of the present application, an accommodating space for accommodating the detection light source assembly is provided in the frame of the middle frame.

In a specific embodiment of the present application, a notch is formed on the side wall of the frame of the middle frame to serve as the accommodating space, and the notch is located below the edge extension of the protective cover of the liquid crystal display screen, And it can form an inclined platform structure with an inclined surface between the side wall and the bottom of the frame, and the inclined surface faces the fingerprint detection area of the liquid crystal display screen; the detection light source assembly is attached to The inclined surface of the inclined platform structure is attached to the lower surface of the edge extension of the protective cover and is located in the containing space.

In a specific embodiment of the present application, the detection light source assembly includes a detection light source group for emitting the detection light, and a substrate for fixing the detection light source group, and the substrate is bonded, welded, or Fasteners are connected to the middle frame.

In a specific embodiment of the present application, the detection light source group includes a plurality of detection light sources for emitting the detection light, and the detection light sources are arranged side by side on the substrate, and/or the detection The light source group is arranged in parallel with the fingerprint identification module.

In a specific embodiment of the present application, a plurality of the detection light sources are symmetrically distributed on both sides of the fingerprint identification module, and the vertical distance between the detection light source group and the center of the fingerprint identification module is less than or equal to 20 mm .

In a specific embodiment of the present application, the detection light source assembly further includes a first circuit board for electrically connecting with the detection light source group, and the first circuit board is located between the detection light source group and the substrate. between.

In a specific embodiment of the present application, the fingerprint identification module is fixed to the bottom plate of the middle frame; wherein the bottom plate of the middle frame is provided with a first opening in the area opposite to the fingerprint identification module. Hole, the first opening is used to transmit the fingerprint detection light passing through the backlight module to the fingerprint identification module through the middle frame, wherein the middle frame includes the bottom plate The border of the edge area.

In a specific embodiment of the present application, the backlight module includes an optical film used to allow the fingerprint detection light to pass through, and a steel plate used to support the optical film, and the fingerprint recognition module The group is arranged below the steel plate, and the steel plate is provided with a second opening in the area corresponding to the fingerprint recognition module, and the second opening is used to allow the optical film to pass through the The fingerprint detection light is transmitted to the fingerprint identification module through the steel plate; wherein, the second opening corresponds to the light-transmitting area.

In a specific embodiment of the present application, the distance between the fingerprint sensor in the fingerprint identification module and the lower surface of the backlight module is 150um-3000um.

In a specific embodiment of the present application, it further includes a second circuit board electrically connected to the fingerprint recognition module, and the fingerprint recognition module is installed on the main board of the electronic device through the second circuit board .

In the second aspect, the present application provides a liquid crystal display fingerprint identification system, which is applied to an electronic device with a middle frame, including a liquid crystal display screen, and the above-mentioned under-screen fingerprint identification device. The fingerprint of the under-screen fingerprint identification device The detection area is at least partially located in the display area of the liquid crystal display screen;

The under-screen fingerprint identification device includes a detection light source assembly and a fingerprint identification module located under the liquid crystal display screen; the detection light source assembly is disposed on the middle frame in an oblique manner and is located on the liquid crystal display screen. Below the edge area, to emit detection light to the fingerprint detection area; the detection light irradiates the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information, and the fingerprint recognition module is used to receive the fingerprint detection area. The fingerprint detection light passing through the liquid crystal display screen.

In a specific embodiment of the present application, the liquid crystal display screen is provided with a shielding layer on the side of the non-display area close to the detection light source assembly, and the shielding layer adopts the protection of the detection light and/or the detection light source assembly. The fingerprint detection light is made of transparent material.

In a specific embodiment of the present application, the detection light and/or the fingerprint detection light are infrared light, and the shielding layer is an infrared see-through ink.

In a specific embodiment of the present application, the middle frame is used to support and accommodate the liquid crystal display screen, an under-screen buffer area is provided between the liquid crystal display screen and the middle frame, and the under-screen buffer area It is filled with cushioning material.

In a third aspect, the present application provides an electronic device, which includes a middle frame and the liquid crystal display fingerprint identification system described in any one of the above.

In the under-screen fingerprint identification device, LCD fingerprint identification system, and electronic equipment provided by this application, the detection light source assembly is installed on the middle frame in an oblique manner to emit detection light, and the detection light irradiates the finger above the fingerprint detection area to form Fingerprint detection light carrying fingerprint information. The fingerprint identification module is located under the liquid crystal display screen, and is used to receive the fingerprint detection light passing through the light-transmitting area to obtain the fingerprint image of the finger, so as to realize the under-screen of the electronic device using the LCD screen Fingerprint recognition solves the problem that the prior art electronic products do not use the LCD screen to realize the under-screen fingerprint recognition function, and fills the gap in the existing electronic products that use the LCD screen to realize the under-screen fingerprint recognition.

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.

FIG. 1 is a partial exploded schematic diagram of a mobile phone equipped with an under-screen fingerprint recognition device provided by an embodiment of the application;

2 is a schematic structural diagram of a mobile phone equipped with an under-screen fingerprint identification device provided by an embodiment of the application;

3 is a partial structural diagram of a mobile phone equipped with an under-screen fingerprint recognition device provided by an embodiment of the present application;

4 is a schematic diagram of the structure of the detection light source assembly provided by this embodiment of the present application;

FIG. 5 is an exploded schematic diagram of a fingerprint identification module provided by an embodiment of the present application.

Description of reference signs:

Mobile phone-100; LCD screen-10; display module-11; protective cover-111; display area-112; non-display area-113; backlight module-12; optical film-121; steel plate-122; Two openings-1221; shielding layer-13; fingerprint identification device under the screen-20; detection light source assembly-21; detection light source group-211; detection light source-2111; substrate-212; fingerprint identification module-22; fingerprint sensor- 221; infrared cut filter-222; optical element-223; second circuit board-224; middle frame-30; first opening-31; frame-32; bottom plate-33; accommodation space-321; inclined platform structure -322; motherboard -40; buffer area under the screen -50.

Detailed ways

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 a person of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The technical solution of the present application will be described in detail below with specific embodiments. 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.

At present, the fingerprint technology under the optical screen of the OLED screen mobile phone has entered the commercial era. Mobile phones with OLED screens use OLED screen pixels to emit light as the light source. The light irradiates the finger to form fingerprint detection light and returns to the OLED screen, which is received by the optical fingerprint sensor below the screen to achieve fingerprint image collection and fingerprint recognition. Due to the high cost of OLED screens, the price of mobile phones using OLED screens is also high. LCD screens have many advantages such as thin body, power saving, and no radiation, and are widely used in electronic products such as TVs, computers, and mobile phones. However, the electronic products in the prior art do not use the LCD screen to realize the function of fingerprint detection under the screen.

To this end, the present application provides an under-screen fingerprint identification device, an LCD fingerprint identification system, and electronic equipment to realize the under-screen optical fingerprint detection.

The embodiments of the present application provide an under-screen fingerprint identification device and a liquid crystal display screen fingerprint identification system applied to electronic equipment. The terminal equipment may include, but is not limited to, mobile phones, tablet computers, televisions, notebook computers, Digital photo frames, navigators, fingerprint locks and other electronic products or components. The terminal equipment includes a liquid crystal display screen, a middle frame, and the under-screen fingerprint identification device or liquid crystal display screen fingerprint identification system provided in the embodiments of the present application.

Hereinafter, in this embodiment, an application scenario of a mobile phone using a liquid crystal display screen is taken as an example to further describe the under-screen fingerprint identification device and the liquid crystal display screen fingerprint identification system of the present application.

Example one

Fig. 1 is a partial exploded schematic diagram of a mobile phone equipped with an under-screen fingerprint recognition device provided by an embodiment of the application, and Fig. 2 is a schematic structural diagram of a mobile phone equipped with an under-screen fingerprint recognition device provided by an embodiment of the application. 3 is a partial structural diagram of a mobile phone equipped with an under-screen fingerprint recognition device provided by an embodiment of the present application. FIG. 4 is a structural diagram of a detection light source assembly provided in this embodiment of the present application. FIG. 5 is a schematic diagram of a detection light source assembly provided in this embodiment of the present application. An exploded schematic diagram of a fingerprint recognition module.

1 to 5, an embodiment of the present application provides an under-screen fingerprint identification device, which is applied to a mobile phone 100 having a liquid crystal display screen 10 and a middle frame 30. The middle frame 30 can be used to house and support the liquid crystal display screen 10. So that at least part of the liquid crystal display screen 10 is located in the middle frame 30, and the fingerprint detection area of the under-screen fingerprint identification device 20 is at least partially located in the display area 112 of the liquid crystal display screen 10;

The under-screen fingerprint identification device 20 includes a detection light source assembly 21 and a fingerprint identification module 22 located under the liquid crystal display screen 10; the detection light source assembly 21 is disposed on the middle frame 30 in an oblique manner and is located below the edge area of the liquid crystal display screen 10. , To emit detection light to the fingerprint detection area; the detection light irradiates the finger above the fingerprint detection area and forms a fingerprint detection light carrying fingerprint information by the finger, where the fingerprint detection light can be the detection light emitted by the detection light source assembly 21 on the finger The reflection or scattering can also be the detection light entering the finger and transmitting from the surface of the finger; the fingerprint identification module 22 is used to receive the fingerprint detection light passing through the light-transmitting area to obtain the fingerprint image of the finger.

It should be noted that, in this embodiment, referring to FIGS. 1 to 2, the mobile phone 100 may include a liquid crystal display screen 10 and a back cover (not marked in the figure), and the middle frame 30 is installed on the liquid crystal display screen 10 and the back cover In between, and the liquid crystal display screen 10 is located in the middle frame 30. Specifically, other components inside the mobile phone 100, such as the main board 40 (ie, circuit board) and the battery of the mobile phone 100, can be installed on the middle frame 30. Specifically, the middle frame 30 can be connected to the LCD screen 10 and the back cover by snapping, bonding, or connecting with fasteners. In this embodiment, the middle frame 30 can include a bottom plate 33 and an edge located at the edge of the bottom plate 33. The frame 32 may extend vertically from the edge of the bottom plate 33 to form a plurality of side walls, and the plurality of side walls cooperate with the bottom plate 33 to form a receiving space for receiving and supporting the liquid crystal display screen 10.

Specifically, in this embodiment, referring to FIGS. 1 and 2, the display area 112 of the liquid crystal display screen 10 is an area on the liquid crystal display screen 10 or the mobile phone 100 for displaying images. The fingerprint detection area of the under-screen fingerprint identification device is at least partially located in the display area 112 of the liquid crystal display screen 10. On the basis of the realization of under-screen fingerprint recognition, the area of the display area 112 on the liquid crystal display screen 10 can be increased to obtain better User experience. Wherein, the fingerprint detection area may specifically be an area for the user to press with a finger to implement a fingerprint input operation.

Specifically, the detection light source assembly 21 is arranged obliquely on the middle frame 30 and located below the edge area of the liquid crystal display screen 10, so that the detection light can be emitted to the finger above the liquid crystal display screen 10 in a side-lighting manner. On the one hand, the detection light can pass through The oblique angle enters the finger and is transmitted from the surface of the finger to form fingerprint detection light, which improves the fingerprint information carried by the fingerprint detection light. On the other hand, the detection light will not be attenuated and affected by the liquid crystal panel and backlight module of the liquid crystal display screen 10. Enhance the fingerprint detection light formed on the finger, thereby improving the effect of fingerprint recognition or fingerprint detection.

In this embodiment, by inclining the detection light source assembly 21 on the middle frame 30 to emit detection light, the detection light irradiates the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information, and the fingerprint identification module 22 Located under the liquid crystal display screen 10, it is used to receive the fingerprint detection light passing through the light-transmitting area to obtain the fingerprint image of the finger, so as to realize the fingerprint recognition under the screen of the electronic device using the LCD screen, thereby solving the problem of the prior art electronic products. The LCD screen is used to realize the function of fingerprint recognition under the screen, which fills the gap in the use of LCD screen to realize the fingerprint recognition under the screen in the existing electronic products.

The liquid crystal display screen 10 generally includes a backlight module 12 under the display module 11, and the fingerprint recognition module 22 is located under the backlight module 12 to ensure detection of the detection light emitted by the light source assembly 21 and the fingerprint detection light formed by irradiating the finger. It can pass through the liquid crystal display screen 10. The backlight module 12 is formed with a light-transmitting area for transmitting fingerprint detection light. The light-transmitting area may refer to the detection light and fingerprint detection light of the relevant optical film of the backlight module 12 The transmission path forms an area where the wavelength band of the fingerprint detection light is transparent, and the fingerprint recognition module 22 is located under the light transmission area of the backlight module 12, so that the fingerprint detection light is transmitted to the fingerprint recognition module 22 through the backlight module 12 .

Specifically, in this embodiment, the light-transmitting area may be the area corresponding to the transmission path of the fingerprint detection light on the liquid crystal display screen 10, and the transmission waveband of the detection light covers the reflection waveband of the detection light, so that the detection light and the finger The formed fingerprint detection light can penetrate the light-transmitting area of the backlight module 12.

In order to prevent the detection light emitted by the detection light source assembly 21 from interfering with the display effect of the liquid crystal display screen 10, in this embodiment, the wavelength of the detection light or the fingerprint detection light is different from that of the backlight provided by the backlight module 12 for displaying images. In other words, the waveband of the detection light or fingerprint detection light is different from the backlight waveband. Therefore, the fingerprint identification module 22 of the embodiment of the present application can not only use the fingerprint detection light passing through the backlight module 12 to achieve under-screen optical fingerprint detection, but also reduce the display effect of the detection light emitted by the detection light source 2111 on the liquid crystal display screen 10. Cause interference to avoid affecting the display effect of the image.

Further, in this embodiment, the detection light and/or fingerprint detection light is infrared light or other light signals with wavelengths outside the visible light band and capable of fingerprint recognition, and the backlight provided by the backlight module 12 is visible light, so that the user The above-mentioned detection light for fingerprint recognition cannot be seen or detected through the liquid crystal display screen 10. In this embodiment, the detection light and/or fingerprint detection light may include, but is not limited to, infrared light.

Wherein, in this embodiment, the detection light emitted by the detection light source 2111 may be infrared light or other light signals with a wavelength outside the visible light band and capable of fingerprint recognition. In this embodiment, the detection light may include but is not limited to infrared light. Light.

1 to 2, the detection light source assembly 21 may be located under the non-display area at the edge of the liquid crystal display screen 10 (for example, located under the protective cover 111 of the display module 11), and the fingerprint recognition module 22 is arranged on the liquid crystal display Below the display area 112 of the screen 10 (for example, below the backlight module 12).

It should be understood that the non-display area 113 on the liquid crystal display screen 10 is an area on the liquid crystal display screen 10 that is not displayed or has no display function, such as a chin area.

Specifically, referring to FIG. 2, the liquid crystal display screen 10 includes a liquid crystal panel and a protective cover 111 on the liquid crystal panel. The detection light source assembly 21 may be located below the edge area of the protective cover 111 and located on the back of the backlight module 12. One side. At this time, the fingerprint identification module 22 and the detection light source assembly 21 are of a split structure. Compared with the integrated structure of the fingerprint identification module 22 and the detection light source assembly 21, the overall structure size of the fingerprint identification device 20 under the screen can be reduced, so that The installation method of the fingerprint identification module 22 and/or the detection light source assembly 21 is more flexible and diversified. In addition, the detection light source 21 is arranged below the edge area of the protective cover 111, which can emit detection light to the finger above the liquid crystal display screen 10 in a side-lighting manner. On the one hand, the detection light will not be affected by the liquid crystal panel and the backlight module. Attenuation and influence can enhance the fingerprint detection light formed on the finger. On the other hand, the detection light can enter the finger through an oblique angle and be transmitted from the surface of the finger to form the fingerprint detection light, which improves the fingerprint information carried by the fingerprint detection light.

Exemplarily, referring to FIG. 2, the protective cover 111 may have an edge extension relative to the backlight module 12, and the edge extension may correspond to the chin area of the mobile phone 100, which can be used as a liquid crystal panel (in the figure Not labeled), and the detection light source assembly 21 can be arranged under the edge extension (ie edge area) of the protective cover 111, and arranged side by side with the liquid crystal panel and the backlight module 12 (ie not overlapping each other) and It is located on the side of the liquid crystal panel and the backlight module 12; alternatively, the detection light source assembly 21 can also be arranged in other positions, and only needs to ensure that the detection light emitted by the detection light source assembly 21 can illuminate the finger above the fingerprint detection area and be reflected by the finger Or the fingerprint detection light formed by transmission can pass through the light-transmitting area of the backlight module 12 and enter the fingerprint identification module 22.

Specifically, the liquid crystal panel may be a touch liquid crystal panel with a touch detection function, and the protective cover 111 is arranged above the liquid crystal panel to protect the liquid crystal panel and provide a user with a finger-operated human-machine interface.

It should be noted that in practical applications, the relative positions of the detection light source assembly 21, the light transmission area of the backlight module 12, and the fingerprint identification module 22 can be adjusted as needed, but the adjusted detection light source assembly 21 , The relative position between the light-transmitting area of the backlight module 12 and the fingerprint identification module 22 needs to be such that the detection light emitted by the detection light source assembly 21 can illuminate the finger above the fingerprint detection area, and is formed by the reflection or transmission of the finger The fingerprint detection light can enter the fingerprint identification module 22 through the light-transmitting area of the backlight module 12.

In order to facilitate the transmission of the fingerprint detection light to the fingerprint identification module 22, as shown in FIG. 2, the detection light source assembly 21 is obliquely arranged in the frame 32 of the middle frame 30, and the angle between the detection light source assembly 21 and the liquid crystal display screen 10 is 30. °-60°, so that the detection light can be emitted obliquely with respect to the liquid crystal display screen 10, so that the detection light enters the finger at an oblique angle and is transmitted from the surface of the finger to form the fingerprint detection light, which improves the fingerprint information carried by the fingerprint detection light.

It should be noted that, in practical applications, the detection light source assembly 21, the fingerprint identification module 22, and the relative position of the light-transmitting area of the backlight module 12 can be detected within the above range to detect the difference between the detection light and the liquid crystal display screen 10. Adjust the angle. In this embodiment, the included angle will not be further limited.

In a possible implementation, as shown in FIG. 2, the frame 32 of the middle frame 30 is provided with an accommodation space 321 for accommodating the detection light source assembly 21, and the detection light source assembly 21 may be arranged on the frame 32 and located in the accommodation space 321. Alternatively, the detection light source assembly 21 may be provided on the lower surface of the non-display area 113 of the liquid crystal display screen 10 and located in the accommodating space 32. Wherein, the detection light source assembly 21 can be installed on the lower surface of the non-display area 113 of the liquid crystal display screen 10 by bonding.

Exemplarily, referring to FIG. 2, the accommodating space 321 may be a gap opened by the middle frame 30 at a position opposite to the detecting light source assembly 21 or other structures capable of accommodating the detecting light source assembly 21. By setting the detecting light source assembly 21 in the accommodating In the space 321, it can be avoided that the overall structure of the mobile phone 100 is too thick due to the arrangement of the detection light source assembly 21.

Specifically, referring to FIG. 2, in order to facilitate the detection of the light source assembly 21 tilted in the middle frame 30, the bottom of the containing space 321 (that is, the middle frame 30 at a position opposite to the detection light source assembly 21) may have a certain tilt angle, In order to detect that the light source assembly 21 is obliquely fixed in the accommodating space 321 of the middle frame 30. Specifically, the side wall of the frame 32 of the middle frame 30 close to the chin area (ie the bottom edge area) of the mobile phone 100 may be formed with the above-mentioned notch as the accommodating space 321. The notch is located below the edge extension of the protective cover 111, and An inclined platform structure 322 with an inclined surface may be formed between the side wall and the bottom of the frame 32. The inclined surface faces the fingerprint detection area of the liquid crystal display screen 10, and the inclination angle may be 30°-60°, such as 45°. The detection light source assembly 21 can be attached to the inclined surface of the inclined platform structure 322 or attached to the lower surface of the edge extension of the protective cover 111, so that the detection light source assembly 21 is obliquely fixed in the receiving space 321 of the middle frame 30.

Further, referring to FIGS. 2 to 4, the detection light source assembly 21 includes a detection light source group 211 for emitting probe light, and a substrate 212 for fixing the detection light source group 211. The substrate 212 is bonded, welded or fastened. The parts are connected to the middle frame 30 and fit with the middle frame 30. Specifically, the detection light source group 211 may be installed in the middle frame 30 obliquely, so that the detection light can be emitted obliquely with respect to the liquid crystal display screen 10 and irradiated on the finger above the fingerprint detection area, so as to improve the fingerprint information carried by the fingerprint detection light. Wherein, the angle between the detection light source assembly 21 and the liquid crystal display screen 10 is 30°-60°.

Further, referring to FIGS. 3 and 4, the detection light source group 211 includes a plurality of detection light sources 2111 for emitting detection light, the detection light sources 2111 are arranged side by side on the substrate 212, and/or the detection light source group 211 and fingerprints The identification modules 22 are arranged in parallel, so that the vertical distance between each detection light source 2111 and the center of the fingerprint identification module 22 is equal.

Wherein, in this embodiment, the detection light source group 211 may be a detection light source group 211 formed by a plurality of discrete detection light sources 2111 fixed on a substrate 212, or the detection light source group 211 may also be an integrated detection light source 2111. The detection light source group 211 with an integrated structure is formed together. Wherein, in this embodiment, the detection light source 2111 may have a symmetrical structure with respect to the substrate 212, that is, the detection light source 2111 is arranged at both ends of the substrate 212 in a symmetric structure; or the detection light source 2111 may also be arranged with respect to the substrate 212. It is non-uniformly distributed on the substrate 212, that is, the detection light source 2111 is distributed differently on both ends of the substrate 212. In this embodiment, the structure of the detection light source group 211 is not further limited.

Specifically, the detection light source 2111 may be an infrared light source, and the detection light emitted by it is all infrared light. Therefore, the fingerprint detection light formed by the detection light irradiating the finger and reflecting, scattering or transmitting on the finger is also infrared light. Exemplarily, the detection light source 2111 may be an infrared light source such as an infrared lamp, an infrared vertical cavity surface emitting laser (VCSEL), an infrared laser diode (Laser Diode), etc., in this embodiment, for the detection The type of the light source 2111 is not further limited.

It should be noted that, in this embodiment, the infrared light emitted by the detection light source 2111 is used as the detection light. Since the penetrating ability of infrared light is stronger than that of visible light, the penetration of the liquid crystal display screen 10 and the backlight module 12 can be more effectively enhanced. The fingerprint detects the light signal, thereby improving the fingerprint recognition effect.

Further, referring to FIGS. 3 and 4, in order to improve the effect of fingerprint recognition, multiple detection light sources 2111 can be symmetrically distributed on both sides of the fingerprint recognition module 22, and the vertical distance between the light source group 211 and the center of the fingerprint recognition module 22 L is less than or equal to 20mm, so that when the detection light source assembly 21 is arranged obliquely in the middle frame 30, the detection light can be concentrated on the finger on the fingerprint detection area, and the distance between the detection light source group 211 and the center of the fingerprint identification module 22 is shortened, thereby shortening The transmission path of the detection light and fingerprint detection light on the liquid crystal display screen 10 reduces the loss of the detection light and fingerprint detection light during the transmission process as much as possible, which can effectively enhance the signal strength of the fingerprint detection light transmitted to the fingerprint recognition module 22 , Thereby improving the effect of fingerprint recognition. Exemplarily, referring to FIGS. 3 and 4, the number of detection light sources 2111 includes but is not limited to four, and the two detection light sources 2111 form a group and are distributed on both sides of the fingerprint identification module 22.

Specifically, the detection light source assembly 21 further includes a first circuit board (not labeled in the figure) for electrically connecting with the detection light source group 211, and the first circuit board is located between the detection light source group 211 and the substrate 212. The first circuit board includes, but is not limited to, a flexible circuit board (Flexible Printed Circuit for short: FPC). In order to facilitate the electrical connection between the detection light source group 211 and the first circuit board, the detection light source assembly 21 further includes a first connector (not marked in the figure), and the detection light source group 211 and the first circuit board are connected through the first connector. Electric connection.

In order to realize the fixation of the fingerprint identification module 22, referring to FIGS. 2 and 5, the fingerprint identification module 22 can be attached to the bottom plate 33 of the middle frame 30 by bonding, screw locking or welding, so that the fingerprint identification module The group 22 is located under the liquid crystal display screen 10. In order to facilitate the fingerprint detection light passing through the backlight module 12 to enter the fingerprint identification module 22 through the middle frame 30, the bottom plate 33 of the middle frame 30 is provided with a first opening 31 in the area opposite to the fingerprint identification module 22. The opening 31 is used to allow the fingerprint detection light passing through the backlight module 12 to pass through the middle frame 30 and transmit to the fingerprint identification module 22, wherein the middle frame 30 includes a frame 32 provided with an edge area of the bottom plate 33.

Specifically, the fingerprint recognition module 22 may be integrally attached to the lower surface of the middle frame 30 and located below the peripheral area of the first opening 31. When the bottom plate 35 of the middle frame 30 has a certain thickness, the fingerprint recognition module 22 may Part of it is accommodated in the first opening 31, so that the fingerprint identification module 22 is completely located under the liquid crystal display screen 10. In this embodiment, the arrangement of the fingerprint identification module 22 is not further limited, as long as it satisfies The fingerprint detection light can enter the fingerprint identification module 22 through the first opening 31.

Wherein, the shape and size of the first opening 31 can satisfy that the fingerprint detection light can basically pass through, so as to avoid affecting the acquisition of the fingerprint image due to the fact that the fingerprint detection light cannot normally pass through the middle frame 30. In this embodiment, The size of the first opening 31 is based on the receiving light path of the fingerprint identification module 22.

Referring to FIG. 5, in this embodiment, the fingerprint recognition module 22 may include an optical element 223, a filter 222, and a fingerprint sensor 221. The filter 222 is located between the optical element 223 and the fingerprint sensor 221. The optical element 223 faces the side of the backlight module 12, and the optical element 223 is used to enable the fingerprint detection light passing through the backlight module 12 to be guided or optically converged through the optical path of the optical element 223 and enter the fingerprint sensor 221 to achieve optical imaging of the fingerprint image. The fingerprint sensor 221 may also be referred to as an optical sensor, an image sensor, an optical fingerprint sensor, an optical sensor, or a fingerprint detection sensor, etc. It may specifically include an optical imaging chip, or an optical imaging chip with a certain optical stack. An optical sensing array of multiple optical sensing units that receives fingerprint detection light and performs photoelectric conversion of the fingerprint detection light. The filter 222 filters other infrared light or interference light outside the wavelength band of the fingerprint detection light, so as to eliminate the interference caused by the above-mentioned light entering the fingerprint sensor 221 to fingerprint recognition, thereby improving the effect of fingerprint recognition.

Specifically, the filter 222 may be attached to the second circuit board 224 and located above the fingerprint sensor 221, or may be directly formed on the optical sensing array or the optical path guiding structure of the fingerprint sensor 221 by coating.

Exemplarily, in this embodiment, the filter 222 includes but is not limited to an infrared cut filter (IR-Cut Filter, IRCF for short). The second circuit board 224 includes but is not limited to a flexible circuit board.

Wherein, the optical element 223 may include a macro lens with at least one spherical or aspheric lens and a physical component for carrying the macro lens. The physical component may include a lens barrel or a lens holder, which is arranged above the second circuit board 224 and A confined space is formed with the second circuit board 224, and the fingerprint sensor 221 and the filter 222 above it can be arranged in the confined space and located in the convergent light path of the macro lens to realize optical fingerprint imaging.

Specifically, referring to FIG. 2, the backlight module 12 includes an optical film 121 for transmitting fingerprint detection light, and a steel plate 122 for supporting the optical film 121, and the fingerprint recognition module 22 is provided on the steel plate 122. The steel plate 122 is provided with a second opening 1221 in the area corresponding to the fingerprint identification module 22. The second opening 1221 is used to transmit the fingerprint detection light passing through the optical film 121 through the steel plate 122 to the fingerprint identification The module 22, wherein the second opening 1221 corresponds to the light-transmitting area. Therefore, the shape and size of the second opening 1221 can satisfy the fingerprint detection light that can pass through, so as to prevent the fingerprint detection light from being unable to normally pass through the steel plate 122 and affect the acquisition of the fingerprint image. In this embodiment, the size of the second opening 1221 is based on the receiving light path of the fingerprint identification module 22.

Further, in order to improve the effect of fingerprint recognition, in this embodiment, the distance between the fingerprint sensor 221 and the lower surface of the backlight module 12 is 150um-3000um. On the basis of achieving a better fingerprint recognition effect, the mobile phone 100 The thickness of the whole machine is not too large. Therefore, in this embodiment, the distance between the fingerprint sensor 221 and the lower surface of the backlight module 12 (ie, the lower surface of the steel plate 122) is limited to the above range. In practical applications, the distance between the fingerprint sensor 221 and the lower surface of the backlight module 12 will also change according to the different application scenarios of the under-screen fingerprint identification device 20, that is, with the different electronic devices. In this embodiment, the distance between the fingerprint sensor 221 and the lower surface of the backlight module 12 will also change. The distance between the fingerprint sensor 221 and the bottom surface of the backlight module 12 is not further limited.

Specifically, the backlight module 12 is arranged under the liquid crystal panel to provide a backlight source for the liquid crystal panel; the backlight module 12 includes a backlight light source (not marked in the figure), and the visible light emitted by the backlight light source is converted into uniform light by the optical film 121 The ground light source illuminates the LCD panel to display the picture.

It should be noted that, in this embodiment, the optical film 121 may include a reflective film, a light guide plate, a brightness enhancement film, a light homogenizing film, etc., and the optical film 121 may be formed with a light-transmitting path in the transmission optical path of the detection light and the fingerprint detection light. The light-transmitting area may be an area with different optical characteristics for visible light and infrared light, so that the optical film 121 performs normal optical processing on the visible light provided by the backlight light source to provide a uniform surface light source for the display module 11, and at the same time The infrared light used in the detection light and fingerprint detection light will not be affected, so that the detection light and fingerprint detection light can normally penetrate the optical film 121 and enter the fingerprint identification module 22.

2 and 5, the fingerprint recognition device 20 under the screen further includes a second circuit board 224 electrically connected to the fingerprint recognition module 22, and the fingerprint recognition module 22 is installed on the main board 40 of the electronic device through the second circuit board 224. Above, the second circuit board 224 includes, but is not limited to, a flexible printed circuit (Flexible Printed Circuit for short: FPC), and the fingerprint identification module 22 and the second circuit board 224 can be bonded by conductive glue.

In the under-screen fingerprint identification device provided by this application, the detection light source assembly is tilted on the middle frame to emit detection light, and the fingerprint identification module located under the liquid crystal display screen is used to receive fingerprint detection light passing through the liquid crystal display screen. In order to obtain the fingerprint image of the finger, the under-screen fingerprint recognition of the electronic device using the LCD screen can fill in the blank of the existing electronic products that use the LCD screen to realize the under-screen fingerprint recognition.

Example two

On the basis of the foregoing embodiment, this embodiment provides a liquid crystal display fingerprint identification system, which is applied to a mobile phone 100 having a middle frame 30, and includes a liquid crystal display screen 10 at least partially located in the middle frame 30, and as in the foregoing embodiment The under-screen fingerprint identification device 20 in the screen, the fingerprint detection area of the under-screen fingerprint identification device 20 is at least partially located in the display area 112 of the liquid crystal display screen 10;

The under-screen fingerprint identification device 20 includes a detection light source assembly 21 arranged on the middle frame 30 and a fingerprint identification module 22 located under the liquid crystal display screen 10; the detection light source assembly 21 is used to emit detection light; the detection light is irradiated to the fingerprint detection The finger above the area is reflected, scattered or transmitted by the finger to form fingerprint detection light carrying fingerprint information, and the fingerprint identification module 22 is used to receive the fingerprint detection light transmitted through the liquid crystal display screen 10.

It should be noted that the liquid crystal display screen 10 includes a display module 11, a backlight module 12, and an under-screen fingerprint identification device 20. The display module 11 includes a liquid crystal panel and a protective cover 111 on the liquid crystal panel. Among them, The liquid crystal panel may be a touch liquid crystal panel with a touch detection function, and the protective cover 111 is arranged above the liquid crystal panel to protect the liquid crystal panel and provide a user with a finger-operated human-machine interface. The backlight module 12 is arranged under the liquid crystal panel to provide a backlight source for the liquid crystal panel; the backlight module 12 includes a backlight light source (not marked in the figure), and the visible light emitted by the backlight light source is converted into a uniform ground light source through an optical film 121. Illuminate the LCD panel to display the screen.

Specifically, in this embodiment, the under-screen fingerprint identification device 20 can refer to the description of the under-screen fingerprint identification device 20 in the foregoing embodiment, and further details are not described in this embodiment.

Further, in order to prevent the user from visually seeing the under-screen fingerprint identification device 20 through the liquid crystal display screen 10, as shown in FIG. 2, the liquid crystal display screen 10 is provided with a shielding layer 13 on the side of the non-display area 113 close to the detection light source assembly 21 That is to say, a shielding layer 13 is provided on the lower surface of the non-display area 113 of the liquid crystal display screen 10, and the shielding layer 13 is used to shield at least the fingerprint identification device 20 under the screen, so as to prevent the user from intuitively passing the liquid crystal display screen 10. Intuitively see the fingerprint identification device 20 under the screen, which improves the aesthetics and user experience of the mobile phone 100.

Further, referring to FIG. 2, in order to avoid the influence of the shielding layer 13 on the transmittance of the detection light, the shielding layer 13 is made of a material that is transparent to the detection light and/or fingerprint detection light. Ensure that the detection light can pass through the liquid crystal display screen 10 and illuminate the finger above the fingerprint detection area, and the fingerprint detection light carrying fingerprint information after being reflected, scattered or transmitted by the finger can pass through the liquid crystal display screen 10 and the fingerprint recognition module The group 22 receives to obtain fingerprint information, so as to perform fingerprint identification or fingerprint detection.

As a possible implementation, in this embodiment, the detection light and/or fingerprint detection light may be infrared light, and correspondingly, the shielding layer 13 may be infrared see-through ink or other transparent inks that can make the detection light and/or fingerprint detection light transparent. However, the material used for shielding is not further limited to the shielding layer 13 in this embodiment.

Further, referring to FIG. 2, in order to protect the liquid crystal display screen 10, an under-screen buffer area 50 is provided between the liquid crystal display screen 10 and the middle frame 30, and the under-screen buffer area 50 is filled with a buffer material through which the buffer The material is filled in the gap between the liquid crystal display screen 10 and the middle frame 30. On the one hand, the backlight module 12 of the liquid crystal display screen 10 and the middle frame 30 have a certain buffering effect, thereby realizing the effect of the backlight module 12 Protection; on the other hand, through the setting of the under-screen buffer area 50, the diffusion of fingerprint detection light in the under-screen buffer area 50 can be avoided, so that the fingerprint detection light can be concentratedly transmitted to the fingerprint recognition module 22, thereby improving the effect of fingerprint recognition . In addition, the dust between the backlight module 12 and the middle frame 30 can be blocked, and the possibility of dust entering the fingerprint recognition module 22 can be reduced.

In the liquid crystal display fingerprint identification system provided by this application, by providing a light-transmitting area on the liquid crystal display screen, the detection light source assembly is tilted in the middle frame to emit detection light, and the fingerprint identification module is located under the liquid crystal display screen , Used to receive the fingerprint detection light through the LCD screen to obtain the fingerprint image of the finger, so as to realize the under-screen fingerprint recognition of the electronic device using the LCD screen to fill the gap in the existing electronic products using the LCD screen to realize the under-screen fingerprint recognition .

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection or an intermediate connection. The medium is indirectly connected, which can be the internal communication between two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in this application can be understood according to specific circumstances.

In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", The orientation or positional relationship indicated by “outside” is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, It is constructed and operated in a specific orientation, so it cannot be understood as a limitation of this application. In the description of the present application, "plurality" means two or more, unless it is specifically specified otherwise.

The terms "first", "second", "third", "fourth", etc. (if any) in the description 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 implementation of the application described herein can be implemented in a sequence other than those illustrated or described herein, for example. 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 those 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.

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. range.

Claims

An under-screen fingerprint identification device applied to an electronic device with a liquid crystal display screen and a middle frame, wherein 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;

The under-screen fingerprint identification device includes a detection light source assembly and a fingerprint identification module located under the liquid crystal display screen; the detection light source assembly is used to be installed on the middle frame in an inclined manner and located on the liquid crystal display Below the edge area of the screen to emit detection light to the fingerprint detection area; the detection light irradiates the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information, and the fingerprint identification module is used for Receiving the fingerprint detection light passing through the liquid crystal display screen to obtain a fingerprint image of the finger.
The under-screen fingerprint identification device according to claim 1, wherein the liquid crystal display screen comprises a backlight module, and a light-transmitting area for transmitting the fingerprint detection light is formed on the backlight module. The fingerprint identification module is located under the light-transmitting area of the backlight module, so that the fingerprint detection light is transmitted to the fingerprint identification module through the backlight module.
The under-screen fingerprint identification device according to claim 2, wherein the wavelength of the detection light or the fingerprint detection light is different from that of the backlight provided by the backlight module for displaying images.
The under-screen fingerprint identification device according to claim 3, wherein the detection light and/or the fingerprint detection light is infrared light, and the backlight provided by the backlight module is visible light.
The under-screen fingerprint identification device according to claim 2, wherein the liquid crystal display screen comprises a liquid crystal panel and a protective cover plate located on the liquid crystal panel, and the detection light source assembly is located on the protective cover plate. The bottom of the edge area is located on one side of the backlight module.
The under-screen fingerprint identification device according to claim 5, wherein the detecting light source assembly is obliquely arranged in the frame of the middle frame, and the angle between the detecting light source assembly and the liquid crystal display screen is 30°-60°.
The under-screen fingerprint identification device according to claim 6, wherein the frame of the middle frame is provided with an accommodation space for accommodating the detection light source assembly.
The under-screen fingerprint identification device according to claim 7, wherein the side wall of the frame of the middle frame is formed with a gap as the accommodating space, and the gap is located on the protective cover of the liquid crystal display screen. Below the edge extension, and between the side wall and the bottom of the frame, an inclined platform structure with an inclined surface may be formed, and the inclined surface faces the fingerprint detection area of the liquid crystal display screen; The detection light source assembly is attached to the inclined surface of the inclined platform structure or attached to the lower surface of the edge extension of the protective cover, and is located in the containing space.
The under-screen fingerprint identification device according to claim 5, wherein the detection light source assembly comprises a detection light source group for emitting the detection light, and a substrate for fixing the detection light source group, the substrate It is connected to the middle frame by bonding, welding or fasteners.
The under-screen fingerprint identification device according to claim 9, wherein the detection light source group includes a plurality of detection light sources for emitting the detection light, and the detection light sources are arranged side by side on the substrate, and /Or, the detection light source group is arranged in parallel with the fingerprint identification module.
The under-screen fingerprint identification device according to claim 10, wherein a plurality of the detection light sources are symmetrically distributed on both sides of the fingerprint identification module, and the detection light source group and the center of the fingerprint identification module The vertical distance is less than or equal to 20mm.
The under-screen fingerprint identification device according to claim 9, wherein the detecting light source assembly further comprises a first circuit board for electrically connecting with the detecting light source group, and the first circuit board is located in the detecting light source assembly. Between the light source group and the substrate.
The under-screen fingerprint identification device according to any one of claims 2-12, wherein the fingerprint identification module is fixed to the bottom plate of the middle frame; wherein the bottom plate of the middle frame is in contact with the bottom plate of the middle frame. The opposite area of the fingerprint identification module is provided with a first opening, and the first opening is used to transmit the fingerprint detection light passing through the backlight module to the fingerprint identification module through the middle frame , Wherein the middle frame includes a frame set at an edge area of the bottom plate.
The under-screen fingerprint identification device according to claim 13, wherein the backlight module comprises an optical film used to allow the fingerprint detection light to pass through, and a steel plate used to support the optical film The fingerprint recognition module is arranged below the steel plate, and the steel plate is provided with a second opening in the area corresponding to the fingerprint recognition module, and the second opening is used to pass through the The fingerprint detection light of the optical film is transmitted to the fingerprint identification module through the steel plate; wherein, the second opening corresponds to the light-transmitting area.
The under-screen fingerprint identification device according to claim 13, wherein the fingerprint identification module includes a filter and a fingerprint sensor, and the filter is arranged above the fingerprint sensor for filtering out the fingerprint. Detect other infrared light or interference light outside the wavelength band of the light, the fingerprint sensor includes an optical sensing array with a plurality of optical sensing units for receiving fingerprint detection light passing through the filter to obtain a fingerprint image of the finger .
The under-screen fingerprint identification device according to claim 15, wherein the filter is directly formed on the optical sensing array or the optical path guiding structure of the fingerprint sensor by a coating method.
The under-screen fingerprint identification device according to claim 15, wherein the fingerprint identification module further comprises an optical element, and the optical element comprises a macro lens with at least one spherical or aspherical lens and a micro lens for carrying a micro lens. The physical component of the lens, the physical component includes a lens barrel or a lens holder, which is arranged above the second circuit board and forms a closed space with the second circuit board. The fingerprint sensor and the filter above it can be arranged in the above It is in a confined space and located in the convergent light path of the macro lens to realize optical fingerprint imaging.
The under-screen fingerprint identification device of claim 15, wherein the distance between the fingerprint sensor and the lower surface of the backlight module is 150um-3000um.
The under-screen fingerprint identification device according to claim 15, further comprising a second circuit board electrically connected to the fingerprint identification module, and the fingerprint identification module is installed in the fingerprint identification module through the second circuit board. Narrated on the motherboard of the electronic device.
A fingerprint identification system for a liquid crystal display screen, which is applied to an electronic device with a middle frame, and is characterized by comprising a liquid crystal display screen, and an under-screen fingerprint identification device according to any one of claims 1-19, the screen The fingerprint detection area of the lower fingerprint identification device is at least partially located in the display area of the liquid crystal display screen;

The under-screen fingerprint identification device includes a detection light source assembly and a fingerprint identification module located under the liquid crystal display screen; the detection light source assembly is arranged in an oblique manner in the middle frame and located on the liquid crystal display screen. Below the edge area, to emit detection light to the fingerprint detection area; the detection light irradiates the finger above the fingerprint detection area to form fingerprint detection light carrying fingerprint information, and the fingerprint recognition module is used to receive the fingerprint detection area. The fingerprint detection light passing through the liquid crystal display screen.
The liquid crystal display fingerprint identification system according to claim 20, wherein the liquid crystal display screen is provided with a shielding layer on the side of the non-display area close to the detection light source assembly, and the shielding layer adopts the detection light And/or the fingerprint detection light is made of a transparent material.
22. The fingerprint identification system of a liquid crystal display screen according to claim 21, wherein the detection light and/or the fingerprint detection light is infrared light, and the shielding layer is infrared see-through ink.
The liquid crystal display fingerprint identification system according to claim 20, wherein the middle frame is used to support and accommodate the liquid crystal display screen, and an under-screen buffer area is provided between the liquid crystal display screen and the middle frame , The buffer area under the screen is filled with buffer material.
An electronic device, characterized by comprising a middle frame, and the liquid crystal display fingerprint identification system according to any one of claims 20-23.