WO2020220305A1

WO2020220305A1 - Under-screen fingerprint identification apparatus and electronic device

Info

Publication number: WO2020220305A1
Application number: PCT/CN2019/085300
Authority: WO
Inventors: 葛丛; 蔡斐欣
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-11-05
Also published as: CN110235143B; CN110235143A

Abstract

An under-screen fingerprint identification apparatus and an electronic device, capable of improving optical fingerprint identification performance under a liquid crystal display (LCD) screen. The under-screen fingerprint identification apparatus is provided below a backlight module of the LCD screen, and comprises: an optical assembly and an optical detection array; the optical assembly is provided diagonally below a fingerprint detection area in the LCD screen; the optical assembly is configured to transmit a particular fingerprint detection signal passing through the backlight module to the optical detection array; the particular fingerprint detection signal is an optical signal after a fingerprint detection signal is refracted by one of a first prism film side surface and a second prism film side surface of a prism film in the backlight module; the fingerprint detection signal is an optical signal returned by finger reflection or scattering above the fingerprint detection area and is used for detecting fingerprint information of the finger.

Description

Fingerprint identification device and electronic equipment under the screen

Technical field

This application relates to the field of optical fingerprint technology, and more specifically, to an under-screen fingerprint identification device and electronic equipment.

Background technique

With the development of biometric technology, under-screen fingerprint recognition technology has become more and more widely used in portable terminals such as mobile phones. At present, passive display screens such as liquid crystal display (LCD) screens provide the light source through the backlight module. Various film structures in the backlight module will seriously interfere with the fingerprint optical imaging of the fingerprint recognition device under the screen, resulting in LCD-based Commercial use of fingerprint recognition technology under the display screen is blocked.

Therefore, how to improve the performance of optical fingerprint recognition under the LCD screen is an urgent technical problem in this field.

Summary of the invention

The embodiments of the present application provide an under-screen fingerprint identification device and electronic equipment, which can solve the problem that the LCD backlight module affects fingerprint optical imaging and improve the fingerprint imaging quality.

In the first aspect, an under-screen fingerprint identification device is provided, which is used to perform under-screen fingerprint detection under a backlight module of a liquid crystal display, and includes: an optical component and a light detection array;

The optical component is arranged obliquely below the fingerprint detection area in the liquid crystal display;

Wherein, the optical component is used to receive the fingerprint detection signal after the fingerprint detection signal is refracted by one of the first prism film side surface and the second prism film side surface of the prism film in the backlight module. Transmitting the specific fingerprint detection signal to the light detection array;

The light detection array is configured to receive the specific fingerprint detection signal, and process the specific fingerprint detection signal into a fingerprint image signal;

Wherein, the fingerprint detection signal is an optical signal returned by reflection or scattering of a finger above the fingerprint detection area, and is used to detect fingerprint information of the finger.

In the technical solution of the embodiment of the present application, the optical component is arranged obliquely below the fingerprint detection area to receive a specific fingerprint detection signal refracted by the side surface of the prism film in one direction of the prism film in the backlight module, thereby Avoid receiving light signals refracted by the sides of the prism film in two directions in the prism film, resulting in dark areas and distortions in the fingerprint image, solving the problem of the LCD backlight module affecting fingerprint optical imaging, and improving fingerprint image quality and fingerprint recognition performance .

In a possible implementation, the fingerprint detection area is located on one side of the optical axis of the optical component.

In a possible implementation, there is no overlap between the fingerprint detection area and the projection of the optical component on the plane where the light detection array is located.

In a possible implementation, the fingerprint detection area is located at the edge area of the field of view of the optical component.

In a possible implementation manner, the light detection array is arranged on the optical axis of the optical component or on one side of the optical axis of the optical component.

In a possible implementation manner, a part of one side of the optical axis of the optical component is used to receive the specific fingerprint detection signal, and the light detection array is arranged on the other side of the optical axis of the optical component.

In a possible implementation, the off-screen fingerprint identification device further includes:

The reflecting device is arranged under the optical component and is used to reflect the specific fingerprint detection signal to the optical component.

In a possible implementation manner, the light detection array is arranged above the optical component.

In a possible implementation manner, the reflection device is parallel to the backlight module.

In a possible implementation manner, the plane where the reflection device is located and the plane where the backlight module is located form an angle.

In a possible implementation manner, the position of the optical component is such that the optical component cannot receive the light signal refracted by the side surface of another prism film in the prism film.

In a possible implementation manner, the position of the light detection array is such that the light detection array cannot receive light signals refracted by the side surface of another prism film in the prism film.

In a possible implementation manner, the optical component is an ultra-wide-angle lens group.

In a possible implementation manner, the ultra-wide-angle lens group includes one or more lenses, and the surface of the one or more lenses is spherical or aspherical.

In a possible implementation manner, the fingerprint detection area is greater than or equal to 5cm*5cm.

The filter layer is arranged in the light path between the backlight module and the light detection array, and is used to filter out the light signal of the non-target waveband and transmit the light signal of the target waveband.

The fixing component is used for fixing the optical component and the light detection array under the backlight module.

In a possible implementation manner, it is characterized in that it further includes:

The infrared light source is used to provide infrared excitation light for fingerprint detection of the under-screen fingerprint identification device. The infrared excitation light irradiates at least part of the display area of the liquid crystal display screen, and the at least part of the display area at least partially covers the Fingerprint detection area of the fingerprint identification device under the screen;

Wherein, the specific fingerprint detection signal includes the specific fingerprint detection infrared light signal of the infrared excitation light of the infrared light source that passes through the backlight module after being reflected by the finger.

In a possible implementation manner, the infrared light source is arranged at an edge area of the field of view of the optical component.

In a possible implementation, the infrared light source is a single or multiple infrared light-emitting diodes;

The single or multiple infrared light emitting diodes are distributed around the fingerprint detection area.

In a second aspect, an electronic device is provided, including a liquid crystal display screen and an under-screen fingerprint identification device as in the first aspect or any possible implementation of the first aspect, wherein the liquid crystal display screen includes a backlight module , The under-screen fingerprint identification device is arranged under the backlight module.

In a possible implementation manner, the electronic device further includes:

In a possible implementation manner, the infrared light source is arranged under the glass cover of the liquid crystal display screen, and is arranged side by side with the liquid crystal panel of the liquid crystal display screen.

In a possible implementation manner, the infrared light source is obliquely attached below the glass cover plate.

In a possible implementation manner, the under-screen fingerprint identification device further includes: an infrared light transmitting layer, which is arranged between the infrared light source and the glass cover and/or the infrared light source and the liquid crystal Between the display screens, it is used to transmit the infrared excitation light and block visible light.

Description of the drawings

FIG. 1 is a schematic structural diagram of an electronic device to which an embodiment of the present application is applied.

Fig. 2 is a schematic structural diagram of an under-screen fingerprint identification device provided by an embodiment of the present application.

Fig. 3 is a schematic structural diagram of another under-screen fingerprint identification device provided by an embodiment of the present application.

Fig. 4 is a schematic structural diagram of another under-screen fingerprint identification device provided by an embodiment of the present application.

Fig. 5 is a schematic structural diagram of another under-screen fingerprint identification device provided by an embodiment of the present application.

6a and 6b are schematic three-dimensional structural views and cross-sectional views of the prism film in the display screen of the embodiment of the present application.

Fig. 7 is a schematic block diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

As smart terminals enter the era of full-screen, the fingerprint collection area on the front of electronic devices is squeezed by the full-screen, so under-display (under-screen) fingerprint recognition technology has attracted more and more attention. Under-screen fingerprint recognition technology refers to the installation of under-screen fingerprint recognition devices (such as fingerprint recognition modules) below the display screen, so as to realize fingerprint recognition operations inside the display area of the display screen, without the need for the front of the electronic device except for the display area Set the fingerprint collection area in the area.

The under-screen fingerprint identification technology may include under-screen optical fingerprint identification technology, under-screen ultrasonic fingerprint identification technology, or other types of under-screen fingerprint identification technology.

Taking the under-screen optical fingerprint recognition technology as an example, the under-screen optical fingerprint recognition technology uses light returned from the top surface of the device display component to perform fingerprint sensing and other sensing operations. The returned light carries information of an object (for example, a finger) in contact with the top surface. By capturing and detecting the returned light, a specific optical sensor module located below the display screen is used to perform under-screen optical fingerprint recognition. The design of the specific optical sensor module may be to achieve desired optical imaging by appropriately configuring optical elements for capturing and detecting returned light.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various electronic devices, and more specifically, can be applied to electronic devices with display screens. For example, portable or mobile computing devices such as smart phones, laptops, tablet computers, and gaming devices, as well as other electronic devices such as electronic databases, automobiles, and automated teller machines (ATM) in banks, but the embodiments of this application are not limited to this .

It should also be understood that, in addition to fingerprint recognition, the technical solutions of the embodiments of the present application can also perform other biometric recognition, such as living body recognition, which is not limited in the embodiments of the present application.

The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings.

It should be noted that, for ease of description, in the embodiments of the present application, the same reference numerals denote the same components, and for brevity, detailed descriptions of the same components are omitted in different embodiments.

It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width, etc. of the fingerprint identification device under the screen are only exemplary descriptions, and are not applicable to this application. Constitute any limitation.

Figure 1 is a schematic structural diagram of an electronic device to which the embodiments of the application can be applied. The electronic device 1 includes a display screen 10 and an under-screen fingerprint identification device 20, wherein the under-screen fingerprint identification device 20 is provided in the The partial area below the display screen 10.

As an optional implementation, as shown in FIG. 1, the under-screen fingerprint identification device 20 includes an optical assembly 300 and a light detection array 400. The light detection array 400 and a reader electrically connected to the light detection array Take the circuit and other auxiliary circuits, which can be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor. The sensing array is specifically a photodetector (Photodetector) array, which includes multiple displays. An array-type distributed photodetector, the photodetector can be used as the above-mentioned pixel unit; the optical assembly 300 can be arranged above the photodetection array 400. The area where the light detection array 400 is located or its sensing area is the fingerprint detection area 103 of the under-screen fingerprint identification device 20. As shown in FIG. 1, the fingerprint detection area 103 is located in the display area of the display screen 10.

In an alternative embodiment, the under-screen fingerprint identification device 20 can also be arranged in other positions, such as the side of the display screen 10 or the non-transparent area of the edge of the electronic device 1, and the optical path design is used to The light signal of at least a part of the display area of the display screen 10 is guided to the under-screen fingerprint identification device 20 so that the fingerprint detection area 103 is actually located in the display area of the display screen 10.

It should be understood that the area of the fingerprint detection area 103 may be different from the area of the light detection array 400 of the under-screen fingerprint identification device 20, for example, through a light path design such as lens imaging, a reflective folding light path design, or other light convergence or reflection. An equal optical path design can make the area of the fingerprint detection area 103 of the fingerprint identification device 20 under the screen larger than the area of the light detection array 400. In other alternative implementations, if the light path is guided by, for example, light collimation, the fingerprint detection area 103 of the under-screen fingerprint identification device 20 can also be designed to be substantially equal to the area of the sensing array of the under-screen fingerprint identification device 20. Consistent.

Therefore, when the user needs to unlock the electronic device or perform other fingerprint verification, he only needs to press his finger on the fingerprint detection area 103 located in the display screen 10 to realize fingerprint input. Since fingerprint detection can be implemented under the screen, the electronic device 1 adopting the above structure does not need to reserve space on the front side for the fingerprint button (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 10 It can be basically extended to the front of the entire electronic device 1.

In terms of specific implementation, the optical assembly 300 and the light detection array 400 may be packaged in the same optical fingerprint component. For example, the optical component 300 and the light detection array 400 can be packaged in the same optical fingerprint chip, or the optical component 300 can be arranged outside the chip where the light detection array 400 is located, for example, the optical component 300 is attached above the chip, or some components of the optical assembly 300 are integrated into the chip.

It should be understood that, in specific implementation, the electronic device 1 further includes a transparent protective cover 130. The cover may be a glass cover or a sapphire cover, which is located above the display screen 10 and covers the The front of the electronic device 1. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 10 actually refers to pressing the cover plate above the display screen 10 or covering the surface of the protective layer of the cover plate.

It should be understood that a circuit board 150 may also be provided under the fingerprint identification device 20 under the screen. The under-screen fingerprint recognition device 20 can be adhered to the circuit board 150 through adhesive, and is electrically connected to the circuit board 150 through bonding pads and metal wires. The under-screen fingerprint identification device 20 can realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 1 through the circuit board 150. For example, the under-screen fingerprint identification device 20 can receive the control signal of the processing unit of the electronic device 1 through the circuit board 150, and can also output the fingerprint detection electrical signal from the under-screen fingerprint identification device 20 to the electronic device 1 through the circuit board 150. Processing unit or control unit, etc.

It should be noted that the optical fingerprint device in the embodiments of the present application may also be referred to as an optical fingerprint recognition module, a fingerprint recognition device, a fingerprint recognition module, a fingerprint module, a fingerprint acquisition device, etc., and the above terms can be replaced with each other.

It should be noted that when the display screen 10 is a display screen with a self-luminous display unit, such as an OLED display screen or a Micro-LED display screen. Taking an OLED display screen as an example, the under-screen fingerprint identification device 20 may use the display unit (ie, OLED light source) of the OLED display screen 10 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. The display screen 10 emits a beam of light to the target finger 140 above the fingerprint detection area 103, and the light is reflected on the surface of the finger 140 to form reflected light or scattered inside the finger 140 to form scattered light. In related patent applications For ease of description, the above reflected light and scattered light are collectively referred to as reflected light. Since the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light from the fingerprint ridge and the reflected light from the fingerprint ridge have different light intensities. After the reflected light passes through the optical assembly 300, it is screened. The light detection array 400 in the lower fingerprint identification device 20 receives and converts it into a corresponding electrical signal, that is, a fingerprint detection electrical signal; based on the fingerprint detection electrical signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby The optical fingerprint recognition function is implemented in the electronic device 1.

When the display screen 10 is a display screen without a self-luminous display unit, such as a liquid crystal display screen or other passive light-emitting display screens, a backlight module needs to be used as the light source of the display screen 10. Taking a liquid crystal display with a backlight module and a liquid crystal panel as an example, in order to support fingerprint detection under the liquid crystal display, as shown in FIG. 1, the display 10 includes a liquid crystal panel 110 and a backlight module 120. The backlight module is used to send a light signal to the liquid crystal panel, and the liquid crystal panel 110 includes a liquid crystal layer and a control circuit for controlling the deflection of the liquid crystal to transmit the light signal. The electronic device 1 may also include an excitation light source 160 for optical fingerprint detection. The under-screen fingerprint identification device 20 is arranged under the backlight module 120. When the finger 140 is pressed against the fingerprint detection area 103, the The light source 160 emits excitation light 111 to the target finger 140 above the fingerprint detection area 103, and the excitation light 111 is reflected on the surface of the finger 140 to form the first reflected light 151 of the fingerprint ridge and the second reflected light 152 of the fingerprint ridge. A reflected light 151 and a second reflected light 152 need to pass through the liquid crystal panel 110 and the backlight module 120, and then pass through the optical assembly 300, and are received by the light detection array 400 in the under-screen fingerprint identification device 20 and converted into fingerprint detection circuits. signal.

During this process, since the prism film 121 and other structures 124 of the backlight module are present in the backlight module 120, the imaging of the fingerprint identification device 20 under the screen will be greatly disturbed. For example, as shown in FIG. 2, the third reflected light 153 is a fingerprint detection light signal that is reflected or transmitted through the central area of the finger. The central area of the finger corresponds to the central area of the fingerprint detection area 103. The under-screen fingerprint identification device 20 is provided Below the central area of the fingerprint detection area 103, the third reflected light 153 is refracted by the prism film side surfaces in two directions in the prism film 121 into a first refracted light 161 and a second refracted light 162 with different directions. The light 161 and the second refracted light 162 cannot enter the optical assembly 300 for imaging. Therefore, the light signal at the center of the finger cannot be received by the light detection array 400, and the center of the fingerprint image detected by the light detection array 400 will form a dark area, resulting in severe field loss. In addition, the fourth reflected light 154 and the fifth reflected light 155 are fingerprint detection light signals that are reflected or transmitted by the finger above the edge area of the fingerprint detection area 103, and the fourth reflected light 154 passes through a side surface of the prism film to form a first The third refracted light 163, the fifth reflected light 155 passes through the other side of the prism film to form the fourth refracted light 164, the third refracted light 163 and the fourth refracted light 164 enter the optical assembly 300 and are The component 300 is transmitted to the light detection array 400, and imaging is performed in the same area in the light detection array 400, which causes the fingerprint image to be distorted. Therefore, due to the influence of the prism film on the optical signal, the field of view is lost and the image is distorted, and the fingerprint recognition under the screen cannot be realized.

The present application provides an under-screen fingerprint device. The under-screen fingerprint device is arranged obliquely below the fingerprint detection area. The light detection array receives the refracted light refracted by one side of the prism film to avoid being in the center of the image. Dark areas and distortion appear, thereby improving the performance of optical fingerprint recognition under the LCD screen.

Hereinafter, the fingerprint identification device of the embodiment of the present application will be described in detail with reference to FIGS. 3 to 5.

FIG. 3 is a schematic structural diagram of an under-screen fingerprint identification device 20 provided by an embodiment of the present application, which is suitable for electronic equipment with a liquid crystal display screen.

As shown in FIG. 3, the under-screen fingerprint identification device 20 is configured to be arranged under the backlight module 120 of the liquid crystal display 10 for under-screen fingerprint detection, wherein the backlight module 120 includes a prism film (brightness film). enhancement film, BEF) 121; the under-screen fingerprint identification device 20 may include: an optical assembly 300 and a light detection array 400;

The optical assembly 300 is arranged obliquely below the fingerprint detection area 103 in the liquid crystal display 10;

Wherein, the optical component 300 is configured to receive a specific fingerprint detection signal formed after the fingerprint detection signal is refracted by one of the prism film sides of the prism film, and transmit the specific fingerprint detection signal to the light detection array 400;

The light detection array 400 is configured to receive the specific fingerprint detection signal, and process the specific fingerprint detection signal into a fingerprint image signal;

The fingerprint detection signal is an optical signal returned by reflection or scattering of a finger above the fingerprint detection area 103, and is used to detect fingerprint information of the finger.

Specifically, in the embodiment of the present application, the optical component 300 may be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more optical lenses, which is used to The reflected light reflected by the finger converges to the light detection array 400 below it, so that the light detection array 400 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the surface of the optical lens in the optical lens layer may be a spherical surface or an aspherical surface. Optionally, the material of the optical lens may be a transparent material such as glass or resin.

Specifically, in the embodiment of the present application, the light detection array 400 includes a plurality of sensing units. The light detection array 400 is used to receive a specific fingerprint detection signal formed after the reflection of a finger and refraction of one of the prism film sides of the prism film, and process the specific fingerprint detection signal to obtain a fingerprint image signal, wherein, a sensing unit A unit signal in the specific fingerprint detection signal is received, and the unit signal is processed into a fingerprint image unit signal, and the fingerprint image unit signal is a unit pixel in the fingerprint image signal. Optionally, the sensing unit may use a photodiode (photodiode), a metal oxide semiconductor field effect transistor (metal oxide semiconductor field effect transistor, MOSFET) and other devices. Optionally, the sensing unit has higher optical sensitivity and higher quantum efficiency for light of a specific wavelength, so as to facilitate detection of optical signals of corresponding wavelengths.

In the embodiment of this application, the fingerprint detection area 103 is the sensing area of the light detection array 400 in the liquid crystal display 10, that is, when the user's finger presses the fingerprint detection area 103, the excitation light signal passes through all the The finger above the fingerprint detection area 103 reflects or scatters and returns a fingerprint detection signal. The fingerprint detection signal is used to detect fingerprint information of the finger. The light detection array 400 fingerprints the finger above the fingerprint detection area 103 Imaging.

Optionally, in a possible implementation manner, the under-screen fingerprint identification device 20 includes an optical fingerprint sensor, and the light detection array 400 is a sensing array in an optical fingerprint sensor. At this time, the fingerprint detection area 103 The area is small and the location is fixed.

Optionally, in other alternative embodiments, the under-screen fingerprint identification device 20 may specifically include a plurality of optical fingerprint sensors; the light detection array 400 is a sensing array of the plurality of optical fingerprint sensors, and the plurality of optical fingerprint sensors The fingerprint sensors may be arranged side by side under the liquid crystal display screen 10 in a splicing manner, and the sensing areas of the multiple optical fingerprint sensors together constitute the fingerprint detection area 103 of the under-screen fingerprint identification device 20. In other words, the under-screen fingerprint identification device 20 may include multiple sub-fingerprint detection areas, and each sub-fingerprint detection area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint detection area of the under-screen fingerprint identification device 20 103 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 of the under-screen fingerprint identification device 20 can also be extended to half the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

In the embodiment of the present application, the optical assembly 300 is arranged obliquely below the fingerprint detection area 103 in the liquid crystal display 10; optionally, in a possible implementation manner, the optical assembly 300 is arranged at all The lower projection area of the fingerprint detection area 103 may be specifically located at the edge of the lower projection area of the fingerprint detection area 103, and the lower projection area of the fingerprint detection area 103 and the optical assembly 300 may overlap partially or completely. Optionally, in another possible implementation manner, the optical assembly 300 is not disposed in the lower projection area of the fingerprint detection area 103, and the lower projection area of the fingerprint detection area 103 and the optical The components 300 may have no overlap.

Specifically, as shown in FIG. 4, the liquid crystal display 10 includes a liquid crystal panel 110, a backlight module 120 and a glass cover 130. The fingerprint detection area 103 may be a sensing area of the light detection array 400 on the glass cover of the liquid crystal display 10.

In the embodiment of the present application, as shown in FIGS. 3 and 4, the backlight module 120 in the liquid crystal display 10 includes a prism film 121 and other backlight module structures 124. The other structures 124 of the backlight module include but not Limited to backlight module structures such as polarizers, diffusers, light guide plates, and reflectors. Specifically, FIGS. 6a and 6b show a three-dimensional structure diagram and a cross-sectional view of a prism film 121 in an embodiment of the present application. The prism film 121 is a plurality of identical prism units 1210 regularly arranged in a row on a substrate 1220. , Where each prism unit 1210 is formed by protruding upward from the base 1220, and each prism unit 1210 is a single source structure with two inclined sides, and the angle between the two inclined sides is a prism unit 1210 The apex angle (apex angle). For example, as shown in FIG. 6b, the cross section of the prism unit 1210 is triangular, and the prism unit 1210 has a structure similar to a triangular prism. Specifically, the inclined sides of a plurality of prism units 1220 are connected to form the upper surface of the prism film 121, wherein, as shown in FIG. 6a and FIG. 6b, the two inclined sides of the prism unit 1210 are respectively the first inclined side surface unit 1221 and The second inclined side surface unit 1231, the plurality of first inclined side surface units 1221 and the plurality of second inclined side surface units 1231 are spaced apart from each other, forming a plurality of first inclined side surface units 1221 parallel to each other in the prism film 121, and parallel A plurality of second inclined side surface units 1231. The plurality of mutually parallel first inclined side surface units 1221 are the first prism film side surfaces 122 of the prism film 121, and the plurality of mutually parallel second inclined side surface units 1231 are the second prisms of the prism film 121 The membrane side 123.

In the embodiment of the present application, the specific fingerprint detection signal may be an optical signal refracted by the fingerprint detection signal through any one of the first prism film side surface or the second prism film side surface. Optionally, the specific fingerprint detection signal The signal is an optical signal refracted by the side 122 of the first prism film. For example, as shown in Figures 3 and 4, the optical signal 201 and the optical signal 202 are the first fingerprint detection signal and the second fingerprint detection signal generated by reflection or scattering of the finger area above the edge of the fingerprint detection area. Both the signal 201 and the second fingerprint detection signal 202 are refracted by the first prism film side 122 to generate a first specific fingerprint detection signal 211 and a second specific fingerprint detection signal 212.

Since the first prism film side surface 122 and the second prism film side surface 123 refract the fingerprint detection signals in the same or similar directions into two different refracted light signals, in the embodiment of the present application, the optical assembly 300 is disposed in all directions. Obliquely below the fingerprint detection area 103, one of the two-direction refracted light signals in a specific direction is received, that is, a specific fingerprint detection signal, and the specific fingerprint detection signal is transmitted to the light detection array 400.

In the embodiment of the present application, by arranging the optical assembly 300 obliquely below the fingerprint detection area 103 to receive a specific fingerprint detection signal refracted by the side surface of the prism film in one direction of the prism film in the backlight module, This avoids receiving light signals refracted by the side surfaces of the prism film in two directions in the prism film, resulting in dark areas and distortions in the fingerprint image, and improving the quality of the fingerprint image and fingerprint recognition performance.

Optionally, as shown in FIGS. 3 and 4, the fingerprint detection area 103 is located on one side of the optical axis of the optical component.

Optionally, the filed of view (FOV) area of the optical component 300 is larger than the fingerprint detection area 103, and the specific fingerprint detection signal received by the light detection array 400 is the optical signal transmitted by the optical component 300 Part of it. Specifically, in the embodiment of the present application, the field of view area of the optical assembly 300 is the field of view area of the optical assembly 300 in the liquid crystal display.

Optionally, the fingerprint detection area 103 is located at the edge area of the field of view of the optical assembly 300. The edge area of the field of view of the optical component 300 is located in the area of the field of view of the optical component 300, and the distance between the center of the edge area of the field of view and the center of the field of view area is greater than or equal to a first threshold, for example, A threshold value is 4/5 of the radius of the field of view area. It should be understood that the first threshold value may also be 3/4 of the radius of the field of view area or other values, which are not limited in the embodiment of the present application.

Optionally, there is no overlap between the projections of the optical component 300 and the fingerprint detection area 103 on the plane where the light detection array 400 is located.

It should be understood that the projection of the optical assembly 300 and the fingerprint detection area 103 on the plane where the light detection array 400 is located may also have an overlapping area, but the light detection array 400 only receives a specific fingerprint detection signal and cannot receive Non-specific fingerprint detection signals, that is, fingerprint detection signals refracted by the two sides of the prism film cannot be received at the same time.

In the embodiment of the present application, the non-specific fingerprint detection signal includes a light signal refracted by the other of the first prism film side surface and the second prism film side surface of the prism film in the backlight module. Optionally, the position of the optical component 300 is such that the optical component 300 cannot receive the non-fingerprint detection signal.

For example, as shown in FIGS. 3 and 4, the non-specific fingerprint detection signal includes an optical signal refracted by the side surface 123 of the second prism film. The position of the optical component 300 is such that the optical component 300 cannot receive the light signal refracted by the side surface 123 of the second prism film.

Optionally, a part of one side of the optical axis in the optical assembly 300 is used to receive the specific fingerprint detection signal, and the light detection array 400 is disposed on the other side of the optical axis in the optical assembly.

For example, as shown in FIGS. 3 and 4, the first specific fingerprint detection signal 211 and the second specific fingerprint detection signal 212 are incident on one side of the optical axis of the optical assembly 300, and the light detection array 400 is located in the The optical assembly 300 is on the other side of the optical axis.

It should be understood that the specific fingerprint detection signals passing through the fingerprint detection area 103 may all be incident on one side of the optical axis of the ultra-wide-angle lens group 300. At this time, the light detection array 400 may be located on the optical axis of the ultra-wide-angle lens group 300. On the other side. The specific fingerprint detection signal passing through the fingerprint detection area 103 may be partly incident on one side of the optical axis of the ultra-wide-angle lens group 300 and partly incident on the other side of the optical axis of the ultra-wide-angle lens group 300. At this time, the light The detection array 400 may be located on the optical axis of the ultra-wide-angle lens group 300, which is not limited in the embodiment of the present application.

Optionally, in this embodiment of the present application, the position of the light detection array 400 is such that the light detection array 400 cannot receive the non-specific fingerprint detection signal.

For example, as shown in FIGS. 3 and 4, the non-specific fingerprint detection signal includes an optical signal refracted by the side surface 123 of the second prism film. The position of the light detection array 400 is such that the light detection array 400 cannot receive the light signal refracted by the side surface 123 of the second prism film.

Optionally, in a possible implementation manner, the optical assembly 300 is an ultra-wide-angle lens group, and the ultra-wide-angle lens group includes one or more ultra-wide-angle lenses. Optionally, the field of view of the ultra-wide-angle lens group is larger than the fingerprint detection area 103. Optionally, the field of view of the ultra-wide-angle lens group ranges from 120° to 180°. For example, as shown in FIG. 4, the optical assembly 300 is an ultra-wide-angle lens group composed of two optical lenses.

Optionally, the optical lens layer may further have a pinhole formed in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device to improve the screen The fingerprint imaging effect of the lower fingerprint identification device 20.

Optionally, the fingerprint detection area 103 is a square greater than or equal to 5 cm*5 cm.

Optionally, increase the object focal length of the optical assembly 300, also referred to as the front focal length of the optical assembly 300, so as to increase the distance from the optical assembly 300 to the fingerprint detection area 103 to enlarge the The field of view of the optical assembly 300. By expanding the field of view of the optical assembly 300 and increasing the area of the light detection array 400, the area of the fingerprint detection area 103 can be increased, thereby increasing the area of the fingerprint image and improving the performance of fingerprint recognition.

Optionally, as shown in FIG. 4, the device 20 for off-screen fingerprint recognition further includes:

The filter layer 500 is used to filter out the optical signal in the non-target wavelength band, and transmit the optical signal in the target wavelength band (that is, the optical signal in the wavelength band required for fingerprint image collection), which is beneficial to reduce the influence of the ambient light signal in the non-target wavelength band. Improve fingerprint recognition performance.

Optionally, the filter layer 500 is disposed in the light path between the backlight module 120 and the light detection array 400. For example, the filter layer 500 may be disposed between the backlight module 120 and the optical assembly 300, or the filter layer 500 may be disposed between the optical assembly 300 and the light detection array 400.

Optionally, the filter layer 500 can be attached to the top of the light detection array 400 by using a glue that has a high transmittance and a low refractive index.

Optionally, the filter layer 500 can be integrated with the photodetection array 400 in a photosensor chip. Specifically, an evaporation process can be used to coat multiple pixel units of the photosensor to form the filter. For the layer 500, for example, a thin film of filter material is prepared over a plurality of pixel units of the photoelectric sensor by methods such as atomic layer deposition, sputtering coating, electron beam evaporation coating, ion beam coating and the like. In this technical solution, the thickness of the filter layer 500 is less than or equal to 20 μm.

In the embodiment of the present application, the filter layer 500 may be a visible light filter, which may be specifically used to filter out wavelengths of visible light, for example, visible light used for image display. The filter may specifically include one or more optical filters, and the one or more optical filters may be configured as, for example, a band-pass filter to filter out light emitted by a visible light source while not filtering out infrared light signals. . The one or more optical filters may be realized, for example, as an optical filter coating formed on one or more continuous interfaces, or may be realized as one or more discrete interfaces.

It should be understood that the filter layer 500 can be fabricated on the surface of any optical component, or along the optical path of the reflected light formed by the reflection of the finger to the light detection array 400. 4 only takes the filter layer 500 disposed between the optical assembly 300 and the light detection array 400 as an example, but the application is not limited to this. For example, the filter layer 500 may also be provided in the backlight module 120.

Optionally, as shown in FIG. 4, the off-screen fingerprint identification device 20 further includes:

The circuit board 600 is electrically connected to the under-screen fingerprint identification device 20 through an electrical connection device.

Optionally, the light detection array 400 in the under-screen fingerprint identification device 20 is provided with metal pads, and the electrical connection device is electrically connected to the under-screen fingerprint identification device 20 through the metal pads.

Optionally, in a possible implementation, as shown in FIG. 4, the circuit board 600 may be a flexible circuit board FPC, and the electrical connection device may be solder, anisotropic conductive film (anisotropic conductive film). , ACF) or other metal connection devices.

Optionally, in a possible implementation manner, the circuit board 600 may also be a printed circuit board (PCB), and the electrical connection device may be a wire bonding (WB) device. For example, the electrical connection device may be a bonding wire made of gold (Au). The printed circuit board 600 may be arranged under the light detection array 400 or arranged in parallel with the light detection array 400.

Optionally, the circuit board 600 may be the circuit board 150 in FIG. 1.

The fixing assembly 700 is used to fix the optical assembly 300 and the light detection array 400 under the backlight module 120.

Optionally, the fixing assembly 700 is also used to fix the filter layer 500 under the backlight module 120.

Optionally, the fixing component 700 is also used to control the distance between the optical component 300 and the fingerprint detection area 103, and used to control the distance between the optical component 300 and the light detection array 400 , It is convenient to control the fingerprint detection signal passing through the fingerprint detection area 103 to be imaged on the light detection array.

Optionally, the fixing component 700 may be made of metal stamping. It should be understood that the fixing component 700 may also be made of plastic or other fixed materials, which is not limited in the embodiment of the present application.

Optionally, the under-screen fingerprint identification device 20 further includes an infrared light source for providing infrared excitation light for fingerprint detection of the under-screen fingerprint identification device, and the infrared excitation light irradiates at least one part of the liquid crystal display A partial display area, the at least partial display area at least partially covering the fingerprint detection area of the under-screen fingerprint identification device;

Wherein, the fingerprint detection signal includes the fingerprint detection infrared signal after the infrared excitation light of the infrared light source is reflected or scattered by the finger, and the specific fingerprint detection signal includes the fingerprint detection infrared signal passing through the prism film of the backlight module A specific fingerprint refracted on the side of a prism film detects infrared signals.

For example, as shown in FIG. 4, the under-screen fingerprint recognition device 20 further includes an infrared light source 30, the infrared light source 30 is used to emit infrared excitation light, the specific direction infrared light signal may be passed through the backlight module 120 The infrared light signal refracted by the first prism film side surface 121 of the middle prism film 121.

Optionally, the infrared light source 30 may be arranged at the edge area of the field of view of the optical assembly 300. For example, as shown in FIG. 4, the fingerprint detection area 103 is located at the edge of the field of view of the optical assembly 300, the infrared light source 30 is located near the fingerprint detection area 103, and the infrared light source 30 and the optical The distance between the center of the component 300 is greater than the farthest distance between the fingerprint detection area 103 and the center of the optical component 300. The distance between point A in the fingerprint detection area 103 and the center of the optical component 300 is greater than the distance between point B in the fingerprint detection area 103 and the center of the optical component 300, and the distance between point A and the optical component 300 The center of the field of view of the component 300 is far away from the infrared light source 30, point B is close to the center of the field of view of the optical component 300, and far away from the infrared light source 30, therefore, the optical illumination at point A is greater than that of B The optical illuminance at the point, correspondingly, the optical illuminance of the image formed by the A point on the light detection array 400 is greater than the optical illuminance of the image formed by the B point. However, due to the imaging characteristics of the optical assembly 300, the optical illuminance at the center of the field of view is greater than the optical illuminance at the edge of the field of view. Therefore, after passing through the optical assembly, the optical illuminance of point B on the light detection array 400 is greater than that of point A. Integrating the influence of infrared light source and optical components on the imaging optical illuminance, the imaging optical illuminance of point A and point B on the fingerprint detection area on the light detection array 400 are similar, which is beneficial to form an imaging picture with uniform light intensity, which is convenient for fingerprints The extraction of signals can effectively improve the accuracy of recognition.

Optionally, in a possible implementation manner, the infrared light source 30 may be arranged under the glass cover 130 of the electronic device, arranged side by side with the liquid crystal panel 110 of the liquid crystal display, and arranged on the liquid crystal display. 10 diagonally above the backlight module 120.

For example, as shown in FIG. 4, the infrared light source 30 may be obliquely attached under the glass cover 130 through optical glue. Optionally, the optical glue may be any kind of optical liquid glue or optical solid glue.

Optionally, in another possible implementation manner, the infrared light source 30 may be arranged under the glass cover 130 of the electronic device, and arranged side by side with the liquid crystal panel 110 and the backlight module of the liquid crystal display 10, specifically The backlight module 120 includes a prism film 121 and other structures 124 of the backlight module.

Optionally, as shown in FIG. 4, an infrared light transmissive can be set between the infrared light source 30 and the glass cover and/or between the infrared light source 50 and the liquid crystal panel 110 in the liquid crystal display 10. The over layer 301, the infrared light transmitting layer 301 is used to transmit the infrared excitation light and block visible light. Optionally, the infrared light transmission layer 301 may be an infrared transmission ink.

Optionally, as shown in FIG. 4, a light-blocking foam 302 may be provided between the infrared light source 30 and the liquid crystal panel 110 in the liquid crystal display 10 to block visible light.

Optionally, the infrared light source 30 is arranged in a non-display area at the edge of the electronic device.

Optionally, the infrared light source 30 may be a single or multiple light-emitting diodes (LEDs). Optionally, multiple infrared light-emitting diodes may form a strip-shaped infrared light-emitting source, which is distributed around the fingerprint detection area 103.

In the embodiments of the present application, by using infrared light of specific fingerprint detection infrared light to perform optical fingerprint detection, it is possible to reduce the interference of screen visible light on infrared light fingerprint detection, and to balance the optical illuminance of infrared light fingerprint images to further improve the quality of fingerprint imaging .

FIG. 5 shows a schematic structural diagram of another under-screen fingerprint identification device 20 according to an embodiment of the present application. As shown in FIG. 5, the under-screen fingerprint identification device 20 may also include a reflective device, such as a mirror or other devices. The device for reflecting optical signals is arranged under the optical component and used for reflecting the specific fingerprint detection signal to the optical component.

Optionally, the light detection array is arranged above the optical component.

In a possible implementation, as shown in FIG. 5, the fingerprint detection area 103 is located at the upper left of the optical assembly 300, and the light detection array 400 is located at the upper right of the optical assembly 300.

It should be understood that when the fingerprint detection area 103 is located at the upper right of the optical assembly 300, the light detection array is located at the upper left of the optical assembly 300.

Optionally, the reflecting device 800 may also be fixed under the backlight module 120 by a fixing assembly 700.

After the first specific fingerprint detection signal 211 and the second specific fingerprint detection signal 212 are reflected by the reflecting device 800, they are received by the optical component 300, and the optical component combines the first specific fingerprint detection signal 211 and the second specific fingerprint detection signal 211 with the second specific fingerprint detection signal. The fingerprint detection signal 212 is transmitted to the light detection array 400.

Optionally, as shown in FIG. 5, the first specific fingerprint detection signal 211 and the second specific fingerprint detection signal 212 are incident on one side of the optical axis of the optical component 300, and the optical detection array 400 is located in the optical component. The other side of the optical axis of the assembly 300.

Optionally, as shown in FIG. 5, the under-screen fingerprint identification device 20 may also include a filter layer 500, a circuit board 600, and an infrared light source 30, an infrared light transmission layer 301, and a light blocking foam 302. For the manner, refer to the description in FIG. 4, which will not be repeated here.

When the under-screen fingerprint recognition device 20 uses the infrared light source 30 as the excitation light source, and the light detection array detects infrared light signals for fingerprint imaging, the reflection device has a certain reflectivity for infrared light, and the reflection device reflects The light wavelength is greater than or equal to 780nm.

Optionally, in the embodiment of the present application, the infrared light source 30 may be disposed at the edge of the field of view of the optical assembly 300, and the fingerprint detection area 103 is also located at the edge of the field of view of the optical assembly 300. In addition, considering the influence of infrared light source and optical components on the imaging optical illuminance, the imaging optical illuminance of point A and point B on the fingerprint detection area on the light detection array 400 are similar, which is conducive to forming an imaging picture with uniform light intensity, which is convenient The extraction of fingerprint signals can effectively improve the accuracy of recognition.

Optionally, as shown in FIG. 5, the reflecting device 800 may be arranged in parallel under the backlight module 120.

Optionally, the reflective device 800 can also be arranged non-parallel below the backlight module 120, and the plane where the reflective device is located forms an angle with the plane where the backlight module is located. For example, the backlight module 120 is located on a horizontal surface, and the reflecting device 800 is arranged at a certain angle to the horizontal surface. By adjusting the angle of the reflecting device, the area of the light detection area 103 can be increased.

In FIG. 5, the specific fingerprint detection signal is reflected by the reflection device 800, and then received by the optical assembly 300 and the photodetection array 300, after meeting the focal length and the field of view of the optical assembly 300 At the same time, compared with FIG. 4, on the basis of reducing the light detection array 400 and the longitudinal space under the screen between the light detection array 400 and the optical assembly 300, the optical assembly 300 to The vertical under-screen space between the backlight modules 120 reduces the under-screen space occupied by the entire under-screen fingerprint identification device 20.

As shown in FIG. 7, an embodiment of the present application further provides an electronic device 2. The electronic device 2 may include a liquid crystal display 10 and the under-screen fingerprint identification device 20 of the above-mentioned application embodiment, wherein the liquid crystal display 10 The above-mentioned backlight module 120 is included, and the under-screen fingerprint identification device 20 is arranged under the backlight module 120.

The electronic device 2 can be any electronic device with a liquid crystal display and a backlight module.

Optionally, as shown in FIG. 7, when the under-screen fingerprint identification device 20 does not include an infrared light source, the electronic device 2 may also include an infrared light source 30.

Optionally, the infrared light source 30 may be arranged under the glass cover of the electronic device, and arranged side by side with the liquid crystal panel of the liquid crystal display.

For example, in a possible implementation, the infrared light source 30 is arranged under the glass cover 130 of the electronic device 2, and is arranged side by side with the liquid crystal panel 110 of the liquid crystal display 10, and is arranged on the backlight of the liquid crystal display 10. Obliquely above the module 120. Specifically, the backlight module 120 includes a prism film 121 and other structures 124 of the backlight module.

For example, in another possible implementation, the infrared light source 30 is arranged under the glass cover 130 of the electronic device 2 and arranged side by side with the liquid crystal panel 110 and the backlight module 120 in the liquid crystal display 10.

Optionally, the infrared light source 30 may be obliquely attached below the glass cover. For example, the infrared light source 30 may be obliquely attached to the bottom of the display screen 10 through optical glue. Optionally, the optical glue may be any optical liquid glue or optical solid glue.

Optionally, an infrared light transmission layer may be provided between the infrared light source 30 and the glass cover and/or between the infrared light source 30 and the liquid crystal display 10, and the infrared light transmission layer is used for It transmits the infrared excitation light and blocks visible light. Optionally, the infrared light transmission layer may be an infrared transmission ink.

Optionally, a light-blocking foam may be provided between the infrared light source 30 and the liquid crystal panel 110 in the liquid crystal display 10 to block visible light.

Optionally, the infrared light source 30 is arranged in a non-display area at the edge of the electronic device 2. For example, the electronic device 2 is a mobile phone, and the non-display area is the mobile phone frame area where the image is not displayed on the surface of the mobile phone. Specifically, the infrared light source 30 is arranged in the lower area corresponding to the mobile phone frame area where the image is not displayed.

It should be understood that the specific examples in the embodiments of the present application are only intended to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application.

It should be understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. For example, the singular forms of "a", "above" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed herein, the units can be implemented by electronic hardware, computer software, or a combination of both, in order to clearly illustrate the interchangeability of hardware and software. In the above description, the composition and steps of each example have been described generally in terms of function. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed system and device may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above-mentioned integrated unit can be realized in the form of hardware or software functional unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application is essentially or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium It includes several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Anyone familiar with the technical field can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

An under-screen fingerprint identification device, which is used to set under the backlight module of a liquid crystal display for under-screen fingerprint detection. The backlight module includes a prism film, and is characterized in that the under-screen fingerprint identification device includes: optical Components and light detection array;

The optical component is arranged obliquely below the fingerprint detection area in the liquid crystal display;

Wherein, the optical component is configured to receive a specific fingerprint detection signal formed after the fingerprint detection signal is refracted by one of the prism film sides of the prism film, and transmit the specific fingerprint detection signal to the light detection array;

The light detection array is configured to receive the specific fingerprint detection signal, and process the specific fingerprint detection signal into a fingerprint image signal;

Wherein, the fingerprint detection signal is an optical signal returned by reflection or scattering of a finger above the fingerprint detection area, and is used to detect fingerprint information of the finger.
The under-screen fingerprint identification device of claim 1, wherein the fingerprint detection area is located on one side of the optical axis of the optical component.
The under-screen fingerprint identification device according to claim 1 or 2, characterized in that the projection of the fingerprint detection area and the optical component on the plane where the light detection array is located has no overlap.
The under-screen fingerprint identification device according to any one of claims 1 to 3, wherein the fingerprint detection area is located at the edge area of the field of view of the optical component.
The under-screen fingerprint identification device according to any one of claims 1 to 4, wherein the light detection array is arranged on the optical axis of the optical assembly or one side of the optical axis in the optical assembly.
The under-screen fingerprint identification device according to any one of claims 1-5, wherein a part of one side of the optical axis of the optical component is used to receive the specific fingerprint detection signal, and the light detection array It is arranged on the other side of the optical axis of the optical component.
The off-screen fingerprint identification device according to any one of claims 1-6, wherein the off-screen fingerprint identification device further comprises:

The reflecting device is arranged under the optical component and is used to reflect the specific fingerprint detection signal to the optical component.
8. The under-screen fingerprint identification device according to claim 7, wherein the light detection array is disposed above the optical component.
The under-screen fingerprint identification device of claim 7 or 8, wherein the reflective device is parallel to the backlight module.
The under-screen fingerprint identification device according to claim 7 or 8, wherein the plane where the reflection device is located and the plane where the backlight module is located form an angle.
The under-screen fingerprint identification device according to any one of claims 1-10, wherein the position of the optical component is such that the optical component cannot receive the light after being refracted by the side surface of another prism film in the prism film. Light signal.
The under-screen fingerprint identification device according to any one of claims 1-11, wherein the position of the light detection array is such that the light detection array cannot receive the side surface of the other prism film. The refracted light signal.
The under-screen fingerprint identification device according to any one of claims 1-12, wherein the optical component is an ultra-wide-angle lens group.
The under-screen fingerprint identification device according to claim 13, wherein the ultra-wide-angle lens group includes one or more lenses, and the surface of the one or more lenses is spherical or aspheric.
The under-screen fingerprint identification device according to any one of claims 1-14, wherein the fingerprint detection area is greater than or equal to 5cm*5cm.
The off-screen fingerprint identification device according to any one of claims 1-15, wherein the off-screen fingerprint identification device further comprises:

The filter layer is arranged in the light path between the backlight module and the light detection array, and is used to filter out the light signal of the non-target waveband and transmit the light signal of the target waveband.
The off-screen fingerprint identification device according to any one of claims 1-16, wherein the off-screen fingerprint identification device further comprises:

The fixing component is used for fixing the optical component and the light detection array under the backlight module.
The under-screen fingerprint identification device according to any one of claims 1-17, further comprising:

The infrared light source is used to provide infrared excitation light for fingerprint detection of the under-screen fingerprint identification device. The infrared excitation light irradiates at least part of the display area of the liquid crystal display screen, and the at least part of the display area at least partially covers the Fingerprint detection area of the fingerprint identification device under the screen;

Wherein, the specific fingerprint detection signal includes the specific fingerprint detection infrared light signal of the infrared excitation light of the infrared light source that passes through the backlight module after being reflected by the finger.
The under-screen fingerprint identification device according to claim 18, wherein the infrared light source is arranged at the edge area of the field of view of the optical component.
The under-screen fingerprint identification device according to claim 18 or 19, wherein the infrared light source is a single or multiple infrared light-emitting diodes;

The single or multiple infrared light emitting diodes are distributed around the fingerprint detection area.
An electronic device, characterized by comprising: a liquid crystal display screen and,

The under-screen fingerprint identification device according to any one of claims 1 to 17, wherein the liquid crystal display includes a backlight module, and the under-screen fingerprint identification device is disposed under the backlight module.
The electronic device according to claim 21, wherein the electronic device further comprises:

The infrared light source is used to provide infrared excitation light for fingerprint detection of the under-screen fingerprint identification device. The infrared excitation light irradiates at least part of the display area of the liquid crystal display screen, and the at least part of the display area at least partially covers the Fingerprint detection area of the fingerprint identification device under the screen;

Wherein, the specific fingerprint detection signal includes the specific fingerprint detection infrared light signal of the infrared excitation light of the infrared light source that passes through the backlight module after being reflected by the finger.
22. The electronic device according to claim 22, wherein the infrared light source is arranged at an edge area of the field of view of the optical component.
The electronic device according to claim 22 or 23, wherein the infrared light source is a single or multiple infrared light-emitting diodes;

The single or multiple infrared light emitting diodes are distributed around the fingerprint detection area.
The electronic device according to any one of claims 22-24, wherein the infrared light source is arranged below the glass cover of the liquid crystal display, and is arranged side by side with the liquid crystal panel of the liquid crystal display .
The electronic device according to claim 25, wherein the infrared light source is obliquely attached below the glass cover.
The electronic device according to claim 25 or 26, wherein the under-screen fingerprint identification device further comprises: an infrared light transmission layer, which is arranged between the infrared light source and the glass cover and/or The infrared light source and the liquid crystal display screen are used to transmit the infrared excitation light and block visible light.