WO2021147020A1

WO2021147020A1 - Fingerprint recognition device and electronic apparatus

Info

Publication number: WO2021147020A1
Application number: PCT/CN2020/073884
Authority: WO
Inventors: 曾凡洲; 刘文拯
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2020-01-22
Filing date: 2020-01-22
Publication date: 2021-07-29
Also published as: CN111837127A

Abstract

Provided are a fingerprint recognition device and an electronic apparatus. The fingerprint recognition device is applied to an electronic apparatus having a liquid crystal display (LCD) screen. The fingerprint recognition device comprises: a prism provided at a sidewall of a middle frame of the electronic apparatus and used to reflect or refract a first optical signal emitted from a light source, such that the reflected or refracted first optical signal is radiated to a finger above the LCD screen; and a fingerprint recognition module provided under the LCD screen and used to receive a second optical signal so as to acquire a fingerprint image of the finger, the second optical signal being part of the first optical signal which is reflected by the finger and passes through the LCD screen.

Description

Fingerprint identification device and electronic equipment

Technical field

The embodiment of the present invention relates to the field of under-screen fingerprint identification, and more specifically, to a fingerprint identification device and electronic equipment.

Background technique

At present, fingerprint recognition under the screen is mainly used in Organic Light-Emitting Diode (OLED) screens. The principle is that the fingerprint recognition module under the OLED screen uses the light transmission characteristics of the OLED screen to receive the light emitted by the OLED screen itself. The reflected light formed by the reflection of the finger detects the fingerprint.

However, because the light-emitting principle and specific structure of liquid crystal display (LCD) screens are different from those of OLED screens, the fingerprint recognition scheme under OLED screens is not suitable for LCD screens.

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

Summary of the invention

A fingerprint identification device and electronic equipment are provided, which can realize the optical fingerprint identification under the LCD screen.

In a first aspect, a fingerprint identification device is provided, which is applied to an electronic device with a liquid crystal display LCD screen, and the fingerprint identification device includes:

A prism, configured to be arranged on the side wall of the middle frame of the electronic device, and used to reflect or refract the first light signal emitted by the light source to irradiate the human finger above the LCD screen;

The fingerprint identification module is configured to be arranged below the LCD screen, the fingerprint identification module is configured to receive a second light signal to obtain a fingerprint image of the human finger, and the second light signal is the first Among the light signals, the light signal returned from the human finger and passed through the LCD screen.

In some possible implementation manners, a slot is provided on the side wall of the middle frame, and the prism is fixed in the slot.

In some possible implementation manners, the slot is provided on the side wall of the middle frame of the electronic device close to the short side.

In some possible implementation manners, the prism is fixed in the slot by glue or injection molding.

In some possible implementations, the light source is fixed on the side wall of the screen flexible circuit board FPC of the LCD screen, and the side wall of the screen FPC is opposite to the side wall of the middle frame so that the light source emits The first optical signal is incident on the prism.

In some possible implementations, the light source is fixed on the side wall of the screen FPC by welding or conductive glue.

In some possible implementation manners, the light source and the prism are arranged opposite and staggered, so that the first light signal is reflected or refracted by the prism to illuminate the human finger above the LCD screen.

In some possible implementations, a support is provided on the side wall of the middle frame, the prism is provided on the support, the light source is provided under the support, and the support is a light-transmitting structure to The first light signal is refracted or reflected by the prism and irradiated to the human finger.

In some possible implementation manners, a substrate is provided on the inner bottom surface of the middle frame under the bracket, and the light source is fixed on the substrate.

In some possible implementation manners, the substrate is fixed to the inner bottom surface of the middle frame by means of glue, solid glue, foam or soldering.

In some possible implementation manners, the bracket is arranged on the side wall of the middle frame of the electronic device close to the short side.

In some possible implementations, the fingerprint recognition module is fixed below the middle frame, wherein the openings in the area where the fingerprint recognition module is fixed on the middle frame correspond to the upper part of the fingerprint recognition module The reinforced rigid plate area in the backlight module of the LCD screen has holes, so that the second light signal is incident on the fingerprint recognition module.

In some possible implementations, the fingerprint recognition module is fixed under the middle frame by optical glue or foam.

In some possible implementations, the fingerprint recognition module is fixed below the reinforcing rigid plate in the backlight module of the LCD screen, wherein the corresponding reinforcing rigid plate area above the fingerprint recognition module is open Holes so that the second light signal is incident on the fingerprint identification module.

In some possible implementation manners, the fingerprint recognition module is fixed under the reinforcing rigid board by optical glue or foam.

In some possible implementations, the fingerprint identification module is fixed on the upper surface of the middle frame and is located under the reinforcing rigid plate in the backlight module of the LCD screen, wherein the fingerprint identification module The upper corresponding to the reinforced rigid plate area of the backlight module of the LCD screen has an opening, so that the second light signal is incident on the fingerprint recognition module.

In some possible implementations, a groove is provided on the upper surface of the middle frame, and the fingerprint identification module is provided in the groove.

In some possible implementations, the fingerprint recognition module is fixed in the groove by optical glue or foam.

In some possible implementations, the horizontal distance between the fingerprint identification module and the short side of the electronic device is within 50 nm.

In some possible implementation manners, the vertical distance between the fingerprint identification module and the light-emitting layer substrate of the LCD screen of the electronic device is between 150 nm and 200 nm.

In some possible implementations, the prism is a triangular prism or a trapezoidal prism.

In some possible implementation manners, the fingerprint identification module includes:

At least one fingerprint sensor, including a plurality of sensor pixels, for receiving the infrared light signal returned from the human finger to obtain a fingerprint image of the human finger;

The optical component is arranged above the plurality of sensor pixels, and is used for guiding the infrared light signal returned from the human finger to the plurality of sensor pixels for optical fingerprint detection.

In the second aspect, an electronic device is provided, including:

Liquid crystal display LCD screen; and

The fingerprint identification device according to the first aspect and any possible implementation manner of the first aspect, wherein the fingerprint identification device is arranged under the LCD screen.

Based on the above technical solutions, in the fingerprint identification device of the embodiment of the present application, the prism is set on the side wall of the middle frame of the electronic device, and the light signal emitted by the light source for fingerprint identification is further guided to the human finger through the prism, and then the light signal passes through Go through the LCD screen to reach the fingerprint recognition module, which can realize the under-screen optical fingerprint recognition.

Description of the drawings

Fig. 1 is a schematic plan view of an electronic device to which the present application can be applied.

Fig. 2 is a schematic partial cross-sectional view of the electronic device shown in Fig. 1 along A-A.

3 to 8 are schematic structural diagrams of an optical fingerprint device according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed ways

As smart terminals enter the full-screen era, 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 identification technology refers to the installation of an under-screen fingerprint identification device (such as a fingerprint identification module) below the display screen, so that fingerprint identification operations are performed 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, and a specific optical sensor module located below the display screen is realized by capturing and detecting the returned light. The design of the specific optical sensor module may be to achieve desired optical imaging by appropriately configuring optical elements for capturing and detecting the 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, notebook computers, tablet computers, game devices, and other electronic devices, but the embodiments of the present application are not limited thereto.

It should also be understood that, in addition to fingerprint recognition, the technical solutions of the embodiments of the present application may also perform other fingerprint 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 accompanying 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 and width of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the fingerprint identification device, are only exemplary descriptions, and should not constitute any part of the application. limited.

Figures 1 and 2 show a schematic diagram of an electronic device 100 to which the fingerprint identification device can be applied, wherein Figure 1 is a front schematic diagram of the electronic device 100 to which the fingerprint identification device can be applied, and Figure 2 is the electronic device 100 shown in Figure 1 along AA Schematic diagram of part of the cross-sectional structure.

As shown in FIGS. 1 and 2, the electronic device 100 may include a display screen 11 and a fingerprint identification device 10. The display screen 11 has a display area 102, and the fingerprint identification device 10 is arranged below the display screen 11. .

Optionally, in some embodiments of the present application, the display screen 11 may also be a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display screens, which is not limited in the embodiments of the present application.

Optionally, in some embodiments of the present application, the display screen 11 may specifically be a touch-sensitive display screen, which can not only perform screen display, but also detect the user's touch or pressing operation, thereby providing the user with a man-machine user-interface. For example, in an embodiment, the electronic device 100 may include a touch sensor, and the touch sensor may specifically be a touch panel (TP), which may be disposed on the surface of the display screen 11, or may be partially Integrated or integrally integrated into the display screen 11 to form the touch screen display.

Optionally, in some embodiments of the present application, the fingerprint identification device 10 may be an optical fingerprint identification device, which may include an optical fingerprint sensor with an optical sensing array, such as an optical fingerprint sensor; the optical sensing array includes multiple There are two optical sensing units, and the area where the optical sensing array is located is the fingerprint collection area of the fingerprint identification device 10, and the multiple optical sensing units are used to collect fingerprint feature information (such as fingerprint image information) of the user.

Optionally, in some embodiments of the present application, the optical sensing array of the fingerprint identification device 10 may specifically be a photodetector array (or called a photodetector array), which includes a plurality of arrays. A distributed optical detector or photodetector, the optical detector or photodetector can be used as the above-mentioned optical sensing unit.

The fingerprint identification device 10 may only include an optical fingerprint sensor. At this time, the fingerprint detection area of the fingerprint identification device 10 has a small area and a fixed position. Therefore, the user needs to press the finger to the fingerprint detection area when performing fingerprint input. Specific location, otherwise the fingerprint identification device 10 may not be able to collect fingerprint images, resulting in poor user experience.

In other embodiments, the fingerprint identification device 10 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be arranged side by side in the middle area of the display screen in a splicing manner, and the plurality of optical fingerprints The sensing area of the sensor together constitutes the fingerprint detection area of the fingerprint identification device 10.

That is to say, the fingerprint detection area of the fingerprint identification device 10 may include multiple sub-areas, and each sub-area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint collection area of the fingerprint identification device 10 can be expanded to The main area of the middle part of the display screen is extended 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 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

Further, the fingerprint identification device 10 further includes an optical component, which can be arranged above the sensing array of the optical fingerprint sensor, specifically including a filter layer, a light guide layer or a light path guide structure, and other optical elements, The filter layer can be used to filter out ambient light penetrating the finger, and the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array for optical detection.

There are multiple implementation solutions for the light guide layer or light path guide structure of the optical component.

As an embodiment, the light guide layer may specifically be a collimator (Collimator) layer fabricated on a semiconductor silicon wafer, which has a plurality of collimator units or a micro-hole array, and the collimator unit may be specifically a small collimator layer. Hole, among the reflected light reflected from the finger, the light that is vertically incident on the collimating unit can pass through and be received by the optical sensing unit below it, while the light with an excessively large incident angle passes through the collimating unit for a lot of time. The secondary reflection is attenuated, so each optical sensing unit can basically only receive the reflected light reflected by the fingerprint lines directly above it, so that the sensing array can detect the fingerprint image of the finger.

As another embodiment, the light guide layer or the light path guide structure may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which is used for The reflected light reflected from the finger is condensed to the sensing array below it, so that the sensing array can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger. 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 fingerprint identification device to improve the fingerprint The fingerprint imaging effect of the recognition device.

In other embodiments, the light guide layer or the light path guide structure may also specifically adopt a micro-lens (Micro-Lens) layer. The micro-lens layer has a micro-lens array formed by a plurality of micro-lenses, which can be grown by semiconductors. A process or other processes are formed above the sensing array, and each microlens may correspond to one of the sensing units of the sensing array.

In addition, other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer. More specifically, the microlens layer and the sensing unit may also include The light-blocking layer of the micro-hole, wherein the micro-hole is formed between its corresponding micro-lens and the sensing unit, the light-blocking layer can block the optical interference between the adjacent micro-lens and the sensing unit, and make the sensing The light corresponding to the unit is condensed into the microhole through the microlens and is transmitted to the sensing unit through the microhole to perform optical fingerprint imaging.

It should be understood that several implementation solutions of the above-mentioned light path guiding structure can be used alone or in combination. For example, a microlens layer can be further provided under the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the micro lens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.

Optionally, in some embodiments of the present application, the fingerprint identification device 10 may be arranged at least in a partial area below the display screen 11, so that the fingerprint collection area (or sensing area) of the fingerprint identification device 10 is at least partially Located in the display area 102 of the display screen 11.

As shown in FIG. 1, the fingerprint collection area 130 is located in the display area 102 of the display screen 11. 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 collection area 130 located on the display screen 11 to realize the fingerprint input operation.

Since fingerprint collection can be implemented inside the display area 102 of the display screen 11, the electronic device 100 adopting the above structure does not need to reserve space on its front to set up fingerprint buttons (such as the Home button), so a full-screen solution can be adopted. The display area 102 of the display screen 11 can basically extend to the entire front surface of the electronic device 100.

It should be understood that the fingerprint collection area 130 shown in FIG. 1 is only an example, and the embodiment of the present application is not limited thereto. For example, in other alternative embodiments, the fingerprint identification device 10 may also be arranged in the entire area below the display screen 11, thereby expanding the fingerprint collection area 130 to the entire display area 102 of the display screen 11. Realize full-screen fingerprint recognition.

It should also be understood that, in specific implementation, the electronic device 100 may further include a protective cover 110, and the protective cover 110 may be specifically a transparent cover, such as a glass cover or a sapphire cover, which is located on the display screen. 11 and covering the front surface of the electronic device 100, and the surface of the protective cover 110 may also be provided with a protective layer. Therefore, in the embodiments of the present application, the so-called pressing of the display screen 11 by a finger may actually refer to pressing the cover plate 110 above the display screen 11 by the finger or covering the surface of the protective layer of the cover plate 110.

In the embodiment of the present application, the fingerprint identification device 10 uses an external light source to provide an optical signal for fingerprint detection. Taking a fingerprint identification device applied to an LCD screen with a backlight module and a liquid crystal panel as an example, in order to support under-screen fingerprint detection of the LCD screen, the electronic device 100 may also include an excitation light source for optical fingerprint detection. It may be an infrared light source or a light source of invisible light of a specific wavelength, which may be arranged under the backlight module of the LCD screen or arranged in the edge area under the protective cover of the mobile terminal, and the fingerprint identification device may be arranged Under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the fingerprint identification device; or, the fingerprint identification device can also be arranged under the backlight module, and the backlight module The group makes holes or other optical designs on film layers such as diffusers, brightness enhancement films, and reflective films to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the fingerprint identification device.

The fingerprint identification device 10 may also be provided with a circuit board 150, such as a flexible printed circuit (FPC). The fingerprint identification device 10 may be soldered to the circuit board 150 through pads, and pass through the circuit board 150. Realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 100. For example, the fingerprint identification device 10 can receive the control signal from the processing sheet of the electronic device 100 through the circuit board 150, and can also output the fingerprint detection signal to the processing unit or control unit of the electronic device 100 through the circuit board 150. Unit etc.

When the display screen 11 adopts a non-self-luminous display screen, such as an LCD screen or other passive light-emitting display screens, a backlight module needs to be used as the light source of the display screen 11. However, due to the optical characteristics of the backlight module, after the visible light emitted by the backlight module is displayed on the image, the light signal that can be reflected by the human finger is very weak, and fingerprint recognition cannot be realized.

The embodiment of the present application provides a fingerprint identification device, which can realize the optical fingerprint identification under the LCD screen.

3 to 8 are schematic structural diagrams of a fingerprint identification device according to an embodiment of the present application. The fingerprint identification device can be applied to an electronic device with an LCD screen.

As shown in Figures 3 to 8, the fingerprint identification device can be applied to electronic equipment with an LCD screen 200, and the fingerprint identification device can include:

The prism 300 is configured to be arranged on the side wall of the middle frame 210 of the electronic device, and is used to reflect or refract the first light signal emitted by the light source 400 to irradiate the human finger above the LCD screen 200;

The fingerprint identification module 500 is configured to be arranged under the LCD screen 200. The fingerprint identification module is configured to receive a second light signal to obtain a fingerprint image of the human finger, and the second light signal is the In the first light signal, the light signal returned from the human finger and passed through the LCD screen 200.

It should be understood that the fingerprint identification device may correspond to the fingerprint identification device 10 in the foregoing embodiment, and for its specific implementation, refer to the relevant description of the fingerprint identification device 10, and for the sake of brevity, it will not be repeated here.

Optionally, in some embodiments of the present application, the fingerprint identification module 500 includes:

Wherein, the at least one fingerprint sensor may correspond to the optical fingerprint sensor of the foregoing embodiment, and the optical component may correspond to the optical component of the foregoing embodiment. For specific implementation, please refer to the relevant description in the foregoing embodiment. For brevity, it will not be repeated here. .

It should be understood that, in the embodiment of the present application, the sensor pixel may also be referred to as a sensing unit, an optical sensing unit, etc., and the information collected by one sensor pixel may be used to form a pixel in a fingerprint image.

Optionally, in some embodiments of the present application, the LCD screen 200 includes a liquid crystal panel 240 and a backlight module 230, the backlight module 230 is disposed under the liquid crystal panel 240, and the backlight module 230 includes A backlight light source used for image display, and the backlight light source may use a visible light source. That is, the light signal used for image display of the LCD screen is visible light. Specifically, the visible light source may be any light source located behind the liquid crystal panel. For example, the visible light source may be an electroluminescence (EL) backlight, a compact cold cathode fluorescent lamp (CCFL) or an LED backlight.

It should be understood that, in the embodiment of the present application, the fingerprint identification device may include a light source 400 for optical fingerprint detection. As an example, the light source may be an infrared light source, and the infrared light signal emitted by it may be used for fingerprint detection. The infrared light signal is invisible light; or in other embodiments, the light source may also be a light source of other specific wavelength invisible light, as long as the wavelength band of the light source for image display is different. In the following, the light source is an infrared light source. Examples are described, but this application is not limited to this.

It should be understood that, in the embodiment of the present application, the second light signal used for fingerprint recognition received by the fingerprint recognition module 500 may be the light used for optical processing of the first light signal emitted by the light source 400 by a human finger. Signal. For example, the light signal received by the fingerprint recognition module 500 may be a light signal reflected by a human finger and passing through the LCD screen 200, or a light signal that is diffused by a human finger and passing through the LCD screen 200. Signals, or light signals transmitted through a human finger and passing through the LCD screen 200 can also be used. The embodiments of the present application do not specifically limit this.

In the embodiment of the present application, a prism 300 is provided on the side wall of the middle frame 210 of the electronic device, and the first light signal emitted by the light source 400 can be reflected or refracted by the prism 300 and irradiated above the LCD screen 200 The human finger of the human body is further transmitted by the human finger to the fingerprint identification module 500 for off-screen optical fingerprint identification.

Therefore, in the fingerprint identification device of the embodiment of the present application, the optical signal used for fingerprint identification uses the infrared light signal emitted by the light source 400, and the optical signal used for displaying the image uses the visible light signal emitted by the visible light source, which can avoid visible light. Interference to fingerprint recognition, and the infrared light signal is invisible light, which will not affect the displayed image. Further, by arranging the prism on the side wall of the middle frame of the electronic device, the prism can guide the infrared light signal emitted by the light source to the human finger, and then pass through the LCD screen to reach the fingerprint recognition module, which can realize the under-screen Optical fingerprint recognition.

As shown in FIGS. 3 to 8, the backlight module 230 may include a light guide plate 231, a reflective film 232, and a reinforcing steel plate 233. Further, a brightness enhancement film and a diffusion film may also be included above the light guide plate 231.

Specifically, the visible light emitted by the backlight light source of the backlight module 230 is transmitted to the diffusion film 232 after passing through the light guide plate 231, and the light diffused by the diffusion film 232 is transmitted to the brightness enhancement film, and the brightness enhancement film is used for gain The received optical signal is transmitted to the liquid crystal panel 240 for image display.

It should be understood that the backlight module 230 shown in FIGS. 3 to 8 is only an example, and the embodiment of the present application is not limited thereto. For example, the backlight module may not include the reinforcing rigid plate 233.

In the embodiment of the present application, the liquid crystal panel 240 may be connected to the driving circuit of the electronic device through a flexible printed circuit (FPC) 220 for driving the liquid crystal panel for image display. The liquid crystal PFC can realize the electrical connection between the liquid crystal panel and the external driving circuit.

In some embodiments of the present application, as shown in FIGS. 3 to 5, the side wall of the middle frame 210 of the electronic device is provided with a slot, and the prism 300 is arranged in the slot. For example, the prism 300 may be fixed in the slot by glue or injection molding.

As shown in FIGS. 3 to 5, the screen FPC has a bent structure and has side walls in a non-horizontal direction (for example, a vertical direction), and the side walls of the screen FPC are opposite to the side walls of the middle frame. The light source 400 may be arranged on the side wall of the screen PFC 220 so that the light signal emitted by the light source 400 can reach the prism 300. For example, the light source 400 is fixed on the side wall of the screen FPC 220 by welding or conductive glue.

It should be understood that the embodiment of the present application does not particularly limit the specific structure of the prism 300 and the specific positional relationship between the light source 400 and the prism 300. In actual applications, the specific structure of the fingerprint recognition module may be determined according to the Optical path, adjusting the optical parameters of the prism 300 such as the surface shape, angle, transmittance, and refractive index, and the positional relationship between the light source 400 and the prism.

In some embodiments, the light source 400 and the prism 300 are arranged opposite and staggered so that the first light signal can be incident on the prism, and the first light signal is reflected or refracted by the prism 300 It can illuminate the human finger above the LCD screen.

The embodiment of the present application does not particularly limit the shape of the prism. As an example, the prism 300 is a triangular prism, and the grooves may also be triangular strip grooves. As another example, the prism 300 is also a triangular prism. It can be a trapezoidal prism, and the slot can also be a trapezoidal strip slot.

Further, a reflective film may be provided on the bonding surface of the prism and the slot to increase the reflectivity of the first light signal in the prism, thereby increasing the amount of light signal irradiated to the human finger. In turn, the fingerprint recognition performance is improved.

In some embodiments, the slot is opened on the side wall of the middle frame close to the short side of the electronic device (or the chin of the electronic device), and the light source 400 is arranged on the side wall of the middle frame close to the chin of the electronic device. On the side wall of the screen FPC 220, so that the first light signal is emitted from the chin position of the electronic device to the human finger without passing through the backlight module of the LCD screen, thereby reducing the light signal loss.

In some embodiments, the light source 400 may be fixed on the side wall of the screen FPC 220 by glue 401.

In one implementation, as shown in FIG. 3, the fingerprint identification module 500 is disposed under the middle frame 210 of the electronic device, wherein the middle frame 210 is fixed to the fingerprint identification module 500 The area is provided with a first opening 211 and the area of the reinforcing rigid plate 233 in the backlight module of the LCD screen above the fingerprint recognition module is provided with a second opening 2330, so that the second light signal It is incident on the fingerprint identification module 500.

Optionally, in this implementation, the size of the first opening 211 is not less than the size of the FOV of the fingerprint identification module corresponding to the size of the middle frame 210, and the size of the second opening 2330 No less than the size corresponding to the FOV of the fingerprint identification module on the reinforcing rigid plate 233, so that the second light signal returned from the human finger within the FOV range of the fingerprint identification module can be The fingerprint recognition module receives.

In some embodiments, the first opening 211 is opened in the middle area or the middle lower area of the middle frame, and the second opening 2330 is opened in the middle area or the middle lower area of the reinforcing rigid plate. The lower area, so that the fingerprint detection area of the fingerprint identification module is located in the middle or lower position of the display area of the LCD screen.

Optionally, the fingerprint recognition module 500 is fixed under the opening of the middle frame 210 by optical glue or foam 501 or the like. In some embodiments, the optical glue may be any kind of optical liquid glue or optical solid glue.

As another implementation manner, as shown in FIG. 4, the fingerprint identification module 500 is fixed below the reinforcing rigid plate 233 in the backlight module 230 of the LCD screen, wherein the fingerprint identification module is above the The corresponding reinforced rigid plate 233 is provided with a second opening 2330 to make the second light signal incident on the fingerprint recognition module 500.

In this implementation, the size of the second opening 2330 is not less than the size of the FOV of the fingerprint identification module corresponding to the size of the reinforcing rigid plate, so as to be within the FOV range of the fingerprint identification module The second light signal returned from the human finger can be received by the fingerprint recognition module.

Optionally, the fingerprint recognition module 500 is fixed under the reinforcing rigid plate 233 by optical glue or foam 501. In some embodiments, the optical glue may be any kind of optical liquid glue or optical solid glue.

As another implementation manner, as shown in FIG. 5, the fingerprint recognition module 500 is fixed on the upper surface 212 of the middle frame 210, and is located under the reinforcing rigid plate 233 in the backlight module of the LCD screen. , Wherein the area of the reinforcing rigid plate 2300 in the backlight module of the LCD screen above the fingerprint recognition module is provided with a second opening 2330 so that the second light signal is incident on the fingerprint recognition module. Group 500.

Optionally, in this implementation manner, the size of the second opening 2330 is not less than the size corresponding to the FOV of the fingerprint recognition module on the reinforcing rigid plate, so that the fingerprint recognition module The second optical signal returned from the human finger within the FOV range of the fingerprint can be received by the fingerprint recognition module.

In some embodiments, the inner bottom surface 212 of the middle frame 210 is provided with a groove 2120, and the fingerprint identification module 500 is arranged in the groove 2120, which can reduce the electronic components of the fingerprint identification module. The thickness of the device.

Optionally, in this implementation manner, the fingerprint identification module 500 may be fixed in the groove 2120 by optical glue or foam. In some embodiments, the optical glue may be any kind of optical liquid glue or optical solid glue.

In the embodiment of the present application, by forming the second opening 2330 on the reinforcing steel plate 233, it is possible to prevent the visible light signal from being transmitted in the direction opposite to the LCD screen as much as possible, and to prevent the backlight module 233 from being exposed to the outside. The impact causes damage, and can effectively reduce the energy loss of the infrared light signal used for fingerprint recognition when passing through the reinforcing steel plate 233.

Optionally, in some embodiments of the present application, the optical refractive index of the optical glue and the liquid crystal panel are the same or similar, which can improve the utilization rate of the optical signal emitted by the light source as much as possible.

In other embodiments of the present application, as shown in FIGS. 6 to 8, a support 600 is provided on the side wall of the middle frame 210, the prism 300 is provided on the support 600, and the light source 400 is provided on the Below the support 600, so that the first light signal is refracted or reflected by the prism 300 and irradiated to the human finger.

Optionally, the prism 300 may be fixed on the bracket of the middle frame 210 by optical glue. In some embodiments, the optical glue may be any kind of optical liquid glue or optical solid glue.

Optionally, the bracket 600 has a light-transmitting structure, for example, a light-transmitting material, or an opaque material can also be used, but the opaque material is provided with a hollow for transmitting all the light emitted by the light source 400.述第一光信号。 Said the first light signal.

In some embodiments, the bracket 600 is arranged on the side wall of the middle frame close to the chin of the electronic device, so that the first light signal is emitted from the position of the chin of the electronic device to the human finger, and It is not necessary to pass through the backlight module of the LCD screen, so that the loss of the optical signal can be reduced.

As an implementation, the side wall of the middle frame near the chin of the electronic device can be thinned to form an accommodation space at the thinned side wall of the middle frame. Further, the prism and the light source can be arranged in the accommodation. In the space.

Figures 6 to 8 also show three typical positions of the fingerprint identification module, which correspond to the positions of the fingerprint identification module in Figures 3 to 5 respectively. For specific descriptions, refer to the relevant description of the foregoing embodiment, for the sake of brevity , I won’t repeat it here.

In the embodiment of the present application, the horizontal distance between the fingerprint identification module and the chin of the electronic device is within 50 nm, and the fingerprint identification module and the light-emitting layer substrate of the LCD screen of the electronic device are within 50 nm. The vertical distance is between 150nm and 200nm, which is conducive to meeting the overall design requirements and assembly requirements of electronic equipment.

In the above embodiment, a foam area 202 is also provided between the backlight module 230 and the inner bottom surface 212 of the middle frame to buffer the damage to the display screen when the electronic device is squeezed or impacted.

Optionally, in some embodiments, the fingerprint identification device further includes: an optical filter for filtering optical signals that are not used for fingerprint detection. For example, the visible light transmitted to the filter can be filtered out, which can further improve the recognition quality of the fingerprint recognition module 500.

In the embodiment of the present application, the filter may be specifically used to filter out the wavelength of visible light, for example, visible light used for image display. The optical filter may specifically include one or more optical filters, and the one or more optical filters may be configured as a band-pass filter, for example, 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 can be fabricated on the surface of any optical component, or along the optical path of the optical signal returned by the reflection or scattering of the human finger to the fingerprint identification module 500. For example, the filter may be attached to the bottom surface of the liquid crystal panel 240, above the reinforcing steel plate 233, or integrated into the fingerprint recognition module 500.

The fingerprint identification device of the embodiment of the present application may also include other structures, such as FPC, which is used to realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic equipment. For example, the fingerprint identification device may pass through the FPC. The control signal from the processing sheet of the electronic device is received, and the fingerprint detection signal can also be output to the processing unit or control unit of the electronic device through the circuit board 150.

An embodiment of the present application also provides an electronic device. As shown in FIG. 9, the electronic device 70 may include a fingerprint identification device 72 and an LCD screen 71, and the fingerprint identification device 72 is disposed under the LCD screen 71.

Optionally, in some embodiments of the present application, the fingerprint identification device 71 may be the fingerprint identification device shown in FIGS. 3 to 8. For specific implementation, refer to the related description of the foregoing embodiments. For brevity, details are not repeated here.

Optionally, in some embodiments of the present application, the LCD screen may be the LCD screen 200 shown in FIG. 3 to FIG. 8. For specific implementation, refer to the related description of the foregoing embodiment. For brevity, details are not repeated here.

It should be noted 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", "said", "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 forms. meaning.

Those skilled in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. 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 as going beyond the scope of the embodiments of the present application.

If 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 solutions of the embodiments of the present application are essentially or the part that contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium. , Including several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk and other media that can store program codes.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the equipment, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed electronic equipment, apparatus, and method may be implemented in other ways.

For example, the division of units or modules or components in the device embodiments described above is only a logical function division, and there may be other divisions in actual implementation. For example, multiple units or modules or components can be combined or integrated. To another system, or some units or modules or components can be ignored or not executed.

For another example, the aforementioned units/modules/components described as separate/display components may or may not be physically separated, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units/modules/components may be selected according to actual needs to achieve the objectives of the embodiments of the present application.

Finally, it should be noted that the mutual coupling or direct coupling or communication connection shown or discussed above may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms. .

The above content is only the specific implementation manners of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto. Any person skilled in the art can easily think of within the technical scope disclosed in the embodiments of the present application. The change or replacement shall be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

A fingerprint identification device, which is characterized in that it is applied to an electronic device with a liquid crystal display LCD screen, and the fingerprint identification device includes:

A prism, configured to be arranged on the side wall of the middle frame of the electronic device, and used to reflect or refract the first light signal emitted by the light source to irradiate the human finger above the LCD screen;

The fingerprint identification module is configured to be arranged below the LCD screen, the fingerprint identification module is configured to receive a second light signal to obtain a fingerprint image of the human finger, and the second light signal is the first Among the light signals, the light signal returned from the human finger and passed through the LCD screen.
The fingerprint identification device according to claim 1, wherein a slot is provided on the side wall of the middle frame, and the prism is fixed in the slot.
The fingerprint identification device according to claim 2, wherein the slot is provided on the side wall of the middle frame of the electronic device close to the short side.
The fingerprint identification device according to claim 2 or 3, wherein the prism is fixed in the slot by glue or injection molding.
The fingerprint identification device according to any one of claims 2 to 4, wherein the light source is fixed on the side wall of the screen flexible circuit board FPC of the LCD screen, and the side wall of the screen FPC is The side walls of the middle frame are opposite so that the first light signal emitted by the light source is incident on the prism.
The fingerprint identification device of claim 5, wherein the light source is fixed on the side wall of the screen FPC by welding or conductive glue.
The fingerprint identification device according to claim 5 or 6, wherein the light source and the prism are arranged opposite and staggered, so that the first light signal is reflected or refracted by the prism and irradiated to the LCD Human fingers at the top of the screen.
The fingerprint identification device according to claim 1, wherein a support is provided on the side wall of the middle frame, the prism is provided on the support, the light source is provided under the support, and the The bracket is a light-transmitting structure, so that the first light signal is refracted or reflected by the prism and irradiated to the human finger.
The fingerprint identification device according to claim 8, wherein a substrate is provided on the inner bottom surface of the middle frame under the bracket, and the light source is fixed on the substrate.
The fingerprint identification device according to claim 9, wherein the substrate is fixed to the inner bottom surface of the middle frame by glue, solid glue, foam or soldering.
The fingerprint identification device according to claim 9 or 10, wherein the bracket is arranged on the side wall of the middle frame of the electronic device close to the short side.
The fingerprint identification device according to any one of claims 1 to 11, wherein the fingerprint identification module is fixed below the middle frame, wherein the fingerprint identification module is fixed on the middle frame The area opening of the fingerprint identification module and the corresponding opening of the reinforced rigid plate area in the backlight module of the LCD screen above the fingerprint identification module, so that the second light signal is incident on the fingerprint identification module.
The fingerprint identification device according to claim 12, wherein the fingerprint identification module is fixed under the middle frame by optical glue or foam.
The fingerprint identification device according to any one of claims 1 to 11, wherein the fingerprint identification module is fixed under the reinforcing rigid plate in the backlight module of the LCD screen, wherein the The corresponding reinforced rigid plate area above the fingerprint identification module has a hole to make the second light signal incident on the fingerprint identification module.
The fingerprint identification device according to claim 14, wherein the fingerprint identification module is fixed under the reinforcing rigid plate by optical glue or foam.
The fingerprint identification device according to any one of claims 1 to 11, wherein the fingerprint identification module is fixed on the upper surface of the middle frame, and is located in the backlight module of the LCD screen. Below the strong rigid board, wherein, the reinforced rigid board area in the backlight module of the LCD screen corresponding to the upper side of the fingerprint recognition module has a hole, so that the second light signal is incident on the fingerprint recognition module .
The fingerprint identification device of claim 16, wherein a groove is provided on the upper surface of the middle frame, and the fingerprint identification module is arranged in the groove.
The fingerprint identification device according to claim 16 or 17, wherein the fingerprint identification module is fixed in the groove by optical glue or foam.
The fingerprint identification device according to any one of claims 1 to 18, wherein the horizontal distance between the fingerprint identification module and the short side of the electronic device is within 50 nm.
The fingerprint identification device according to any one of claims 1 to 19, wherein the vertical distance between the fingerprint identification module and the light-emitting layer substrate of the LCD screen of the electronic device is 150nm to 200nm between.
The fingerprint identification device according to any one of claims 1 to 20, wherein the prism is a triangular prism or a trapezoidal prism.
The fingerprint identification device according to any one of claims 1 to 20, wherein the fingerprint identification module comprises:

At least one fingerprint sensor, including a plurality of sensor pixels, for receiving the infrared light signal returned from the human finger to obtain a fingerprint image of the human finger;

The optical component is arranged above the plurality of sensor pixels, and is used for guiding the infrared light signal returned from the human finger to the plurality of sensor pixels for optical fingerprint detection.
An electronic device, characterized in that it comprises:

Liquid crystal display LCD screen;

The fingerprint identification device according to any one of claims 1 to 22, wherein the fingerprint identification device is arranged under the LCD screen.