CN110730967A

CN110730967A - Fingerprint identification device and electronic equipment

Info

Publication number: CN110730967A
Application number: CN201980002794.6A
Authority: CN
Inventors: 廖志川; 李顺展; 青小刚
Original assignee: Shenzhen Huiding Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2018-10-15
Filing date: 2019-05-15
Publication date: 2020-01-24

Abstract

The embodiment of the application discloses fingerprint identification device and electronic equipment can be applicable to liquid crystal display and can improve fingerprint detection performance. The fingerprint identification device is suitable for electronic equipment with a liquid crystal display screen, the liquid crystal display screen comprises a liquid crystal panel and a backlight module, and a fingerprint detection area of the fingerprint identification device is positioned in a display area of the liquid crystal display screen; the fingerprint identification device comprises a fingerprint sensor and a reflection assembly comprising a first reflection device and a second reflection device, wherein the fingerprint sensor is arranged below a non-display area of the liquid crystal panel, and the first reflection device faces to a photosensitive surface of the fingerprint sensor; the second reflection device is used for reflecting the fingerprint detection light which is formed by the reflection or scattering of the finger above the fingerprint detection area and penetrates through the liquid crystal panel to the first reflection device, and the first reflection device is used for reflecting the fingerprint detection light to the fingerprint sensor so that the fingerprint sensor can detect the fingerprint information of the finger according to the fingerprint detection light.

Description

Fingerprint identification device and electronic equipment

This application claims priority from the chinese patent office filed on 15/10/2018 under the application number PCT/CN2018/110297, and from 22/01/2019 under the application number PCT/CN2019/072598, which are incorporated herein by reference in their entireties.

Technical Field

The embodiment of the application relates to the field of fingerprint identification under a screen, in particular to a fingerprint identification device and an electronic device.

Background

At present, the application of the under-screen fingerprint identification technology in electronic devices such as mobile phones is more and more extensive, but because the under-screen fingerprint identification device needs to be arranged below a display screen, the under-screen fingerprint identification technology can only be applied to self-luminous display screens such as OLED display screens. For most widely applied Liquid Crystal Display (LCD) screens and other passive display screens, the display panel provides a light source through the backlight module, and the backlight module has opacity, so that the current device for identifying the fingerprint under the screen cannot be applied to electronic equipment using the LCD screen to detect the fingerprint under the screen, thereby limiting the application scenarios of the technology for identifying the fingerprint under the screen.

Disclosure of Invention

The embodiment of the application provides a fingerprint identification device and electronic equipment, can be applicable to liquid crystal display and improve fingerprint detection performance.

In a first aspect, an off-screen fingerprint identification device is provided, which is suitable for an electronic device having a liquid crystal display screen, where the liquid crystal display screen includes a liquid crystal panel and a backlight module, and a fingerprint detection area of the fingerprint identification device is located in a display area of the liquid crystal display screen; the under-screen fingerprint identification device comprises a fingerprint sensor and a reflection assembly, the fingerprint sensor is arranged below a non-display area of the liquid crystal panel, the reflection assembly comprises a first reflection device and a second reflection device, and the first reflection device faces to a light sensing surface of the fingerprint sensor; the second reflection device is used for reflecting fingerprint detection light which is formed by reflecting or scattering a finger above a fingerprint detection area of the liquid crystal display screen and penetrates through the liquid crystal panel to the first reflection device, the first reflection device is used for reflecting the fingerprint detection light to the fingerprint sensor, and the fingerprint sensor is used for receiving the fingerprint detection light reflected by the first reflection device and detecting fingerprint information of the finger according to the fingerprint detection light.

In some possible implementations, the first reflecting means includes a light reflecting area, wherein the light reflecting area is disposed above the fingerprint sensor and prevents a light signal formed by reflection of the fingerprint detection light on the surface of the fingerprint sensor from entering the light reflecting area again.

In some possible implementations, the light reflecting area of the first reflecting device is parallel to the photosensitive surface of the fingerprint sensor, and the center of the light reflecting area is offset from the center of the photosensitive surface of the fingerprint sensor.

In some possible implementations, the first reflecting device further includes a non-light reflecting region adjacent to the light reflecting region for receiving a light signal formed by reflection of the fingerprint detection light on the fingerprint sensor surface.

In some possible implementations, the fingerprint sensor includes a sensing array having a plurality of optical sensing units, and the fingerprint detection light detected by the fingerprint sensor includes a near-end light signal and a far-end light signal, where the near-end light signal is the fingerprint detection light received by the optical sensing unit of the fingerprint sensor close to the fingerprint detection area, and the far-end light signal is the fingerprint detection light received by the optical sensing unit of the fingerprint sensor far from the fingerprint detection area.

In some possible implementations, the light signal formed after the near-end light signal is partially reflected by the surface of the fingerprint sensor cannot enter the light reflecting area of the first reflecting means.

In some possible implementations, the far-end light signal is reflected from an edge location of the light-reflective area of the first reflecting device to the fingerprint sensor.

In some possible implementations, the under-screen fingerprint identification device further includes an optical lens disposed between the second reflection device and the first reflection device vertically or obliquely, for focusing the fingerprint detection light reflected by the second reflection device to the first reflection device.

In some possible implementations, the second reflecting device is close to the fingerprint detection area of the liquid crystal display screen, and the reflecting surface of the second reflecting device and the sensing surface of the fingerprint sensor both face the liquid crystal panel.

In some possible implementations, at least one of the first reflecting device and the second reflecting device is disposed obliquely with respect to the light-sensing surface of the fingerprint sensor to increase the area of the fingerprint detection area of the under-screen fingerprint identification device on the liquid crystal display.

In some possible implementations, the first reflecting device has a first inclination angle with respect to the photosensitive surface of the fingerprint sensor, and the second reflecting device is parallel to the photosensitive surface of the fingerprint sensor, where the first inclination angle is greater than 0 and less than or equal to 2 °.

In some possible implementations, the second reflecting device has a second inclination angle with respect to the photosensitive surface of the fingerprint sensor, and the first reflecting device is parallel to the photosensitive surface of the fingerprint sensor, where the second inclination angle is greater than 0 and less than or equal to 2 °.

In some possible implementations, the first reflecting device and the second reflecting device are both disposed at an inclination compared to the photosensitive surface of the fingerprint sensor, and the inclination angle of the first reflecting device relative to the second reflecting device is greater than 0 and less than or equal to 4 °.

In some possible implementations, the second reflecting device includes a convex mirror, and the convex mirror is used to increase the area of the fingerprint detection area of the under-screen fingerprint identification device on the liquid crystal display screen.

In some possible implementations, the convex mirror includes a substrate and a convex structure formed on the substrate, and a reflective coating is disposed on a surface of the convex structure.

In some possible implementations, the under-screen fingerprint identification apparatus further includes a light-emitting unit, which is configured to provide a detection light for the fingerprint sensor, where the detection light is configured to reflect or scatter a finger above the fingerprint detection area to form the fingerprint detection light

In some possible implementations, the light emitting unit and the fingerprint sensor are disposed on the same flexible circuit board and connected to an external circuit through the flexible circuit board.

In some possible implementation manners, a light guide column is further disposed around the light emitting unit, and the light guide column is used for guiding the detection light emitted by the light emitting unit to a fingerprint detection area of the liquid crystal display screen.

In some possible implementations, a light guide pillar is further disposed around the light emitting unit, and the light guide pillar is used for guiding the detection light emitted by the light emitting unit to the liquid crystal display screen.

In some possible implementations, the under-screen fingerprint identification device includes two or more light-emitting units, and the two or more light-emitting units are respectively disposed at two sides of the second reflection device, and the two or more light-emitting units are closer to the fingerprint detection area than the fingerprint sensor.

In some possible implementations, the fingerprint sensor and the reflection assembly are configured to be disposed above a backlight module of the liquid crystal display or located at a side of the backlight module.

In some possible implementations, the second reflecting device at least partially extends below the display area of the liquid crystal panel, and the second reflecting device can transmit the backlight emitted by the backlight module and reflect the fingerprint detection light.

In some possible implementations, the backlight module has a profile structure extending downward at a non-display area of the liquid crystal panel to form an avoidance space, and the fingerprint sensor and the reflection assembly are disposed in the avoidance space.

In a second aspect, an electronic device is provided, which includes a liquid crystal display screen and an underscreen fingerprint identification apparatus as in the first aspect or any possible implementation manner thereof, where the liquid crystal display screen includes a liquid crystal panel and a backlight module, and the underscreen fingerprint identification apparatus is disposed below a non-display area of the liquid crystal panel and above the backlight module.

In a third aspect, a fingerprint identification device is provided, which includes a fingerprint sensor, an optical lens, and a reflection assembly, the reflection assembly includes a first reflection device and a second reflection device, the first reflection device faces a photosensitive surface of the fingerprint sensor, the optical lens is disposed between the first reflection device and the second reflection device, wherein the second reflection device is configured to reflect fingerprint detection light to the optical lens, the optical lens is configured to focus the fingerprint detection light to the first reflection device, the first reflection device is configured to reflect the fingerprint detection light from the optical lens to the fingerprint sensor, and the fingerprint sensor is configured to receive the detection light reflected by the first reflection device and detect fingerprint information of a finger according to the fingerprint detection light.

In some possible implementations, the fingerprint detection light is a light signal that is formed and returned by reflection or scattering of a finger over a display area of the display screen.

In some possible implementations, the light reflecting area of the first reflecting device is parallel to the light-sensitive surface of the fingerprint sensor and at most partially covers the light-sensitive surface of the fingerprint sensor.

In some possible implementations, the fingerprint sensor includes a sensing array having a plurality of optical sensing units, and the fingerprint detection light detected by the optical sensing unit of the fingerprint sensor near the end of the optical lens includes a near-end light signal, where a light signal formed after the near-end light signal is partially reflected on the surface of the fingerprint sensor cannot enter the light reflection area of the first reflection device.

In some possible implementations, the fingerprint detection light detected by the optical sensing unit at the end of the fingerprint sensor far from the optical lens includes a far-end light signal reflected from an edge position of the light reflecting area of the first reflecting device to the fingerprint sensor.

In some possible implementations, at least one of the first reflecting means and the second reflecting means is disposed obliquely with respect to a light-sensitive surface of the fingerprint sensor.

In some possible implementations, the second reflecting device includes a convex mirror including a convex structure, and a reflective coating is disposed on a surface of the convex structure.

In some possible implementations, the fingerprint identification device further includes a light emitting unit, which is configured to provide a detection light for the fingerprint sensor, wherein the detection light is configured to irradiate a finger to form the fingerprint detection light.

In some possible implementations, a light guide pillar is further disposed around the light emitting unit, and the light guide pillar is configured to guide the detection light emitted by the light emitting unit to a preset fingerprint detection area, so that the finger above the fingerprint detection area is reflected or scattered to form the fingerprint detection light.

In some possible implementations, a light guide pillar is further disposed around the light emitting unit, and the light guide pillar is configured to guide the detection light emitted by the light emitting unit to the display screen, so that the finger above the fingerprint detection region of the display screen is reflected or scattered to form the fingerprint detection light.

In some possible implementations, the fingerprint identification device includes two or more light emitting units, and the two or more light emitting units are respectively disposed at two sides of the second reflection device, and the two or more light emitting units are located in front of the fingerprint sensor.

In some possible implementations, the optical lens includes at least one lens and a micro-aperture stop, wherein a center of the micro-aperture stop is not aligned with an optical center of the at least one lens.

In a fourth aspect, there is provided an off-screen fingerprint identification apparatus, including the fingerprint identification apparatus as in the third aspect and any possible implementation manner thereof, wherein the fingerprint identification apparatus is configured to be disposed below a display screen, and a fingerprint detection area of the fingerprint identification apparatus is located in a display area of the display screen.

In some possible implementations, the display screen is a liquid crystal display screen including a liquid crystal panel and a backlight module, wherein the fingerprint identification device is configured to be disposed below a non-display area of the liquid crystal panel and above the backlight module, so as to detect fingerprint detection light that is formed by a finger above a display area of the liquid crystal panel and returns to the non-display area of the liquid crystal panel through the liquid crystal panel.

In the technical scheme that this application embodiment provided, fingerprint identification device can include two reflect meter, and fingerprint sensor is used for receiving the fingerprint detection light after two reflect meter reflect, consequently can prolong the fingerprint of finger reflection and detect the route of light to fingerprint sensor's light to can increase the area of fingerprint detection region, make more light can incide to fingerprint sensor, improve fingerprint identification's success rate.

Drawings

Fig. 1 is a schematic diagram of an application scenario of the underscreen fingerprint recognition provided in an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of an electronic device to which a conventional underscreen fingerprint identification apparatus according to an embodiment of the present application is applied.

Fig. 4 is a schematic structural diagram of an underscreen fingerprint identification device according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of a second reflection apparatus according to an embodiment of the present disclosure.

Fig. 12 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 13 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 14 is a schematic structural diagram of another device for identifying fingerprints under a screen according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The embodiments of the present application can be applied to fingerprint systems, including but not limited to optical, ultrasonic or other fingerprint identification systems and medical diagnostic products based on optical, ultrasonic or other fingerprint imaging, and the embodiments of the present application are only described by way of example, but should not be construed as limiting the embodiments of the present application, and the embodiments of the present application are also applicable to other systems using optical, ultrasonic or other imaging technologies, and the like.

The technical solution of the embodiment of the present application may perform other biometric identification, for example, living body identification, besides fingerprint identification, which is not limited in the embodiment of the present application.

The technical scheme of the embodiment of the application can be applied to various electronic devices, and more particularly, can be applied to electronic devices with display screens. For example, portable or mobile computing devices such as smart phones, notebook computers, tablet computers, and game devices, and other electronic devices such as electronic databases, automobiles, and Automatic Teller Machines (ATMs), but the present application is not limited thereto.

More specifically, in the above electronic device, the fingerprint recognition device may be embodied as an optical fingerprint device, which may be disposed in a partial area or an entire area below the display screen, thereby forming an under-screen (under-display) optical fingerprint system. The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity.

It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the underscreen fingerprint identification device shown in the drawings are merely illustrative and should not be construed as limiting the present application in any way.

Fig. 1 is a schematic structural diagram of a terminal device to which an off-screen fingerprint identification device can be applied, and the terminal device 100 includes a display screen 120 and a fingerprint identification device 130, wherein the fingerprint identification device 130 is disposed in a local area below the display screen 120. The fingerprint recognition device 130 includes a sensing array having a plurality of optical sensing units, and the sensing array is located in a fingerprint detection area 103 of the fingerprint recognition device 130.

As shown in fig. 1, the display screen 120 may include a display area 102 and a non-display area 105, and the fingerprint detection area 103 is located in the display area 102 of the display screen 120, so that when a user needs to unlock or otherwise verify a fingerprint of the terminal device, the user only needs to press a finger on the fingerprint detection area 103 located on the display screen 120 to input the fingerprint. Since fingerprint detection can be implemented in the screen, the terminal device 100 adopting the above structure does not need a special reserved space on the front surface thereof to set a fingerprint key (such as a Home key), and thus a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be basically extended to the whole front surface of the terminal device 100.

The display 120 may be a Liquid Crystal Display (LCD) or other passive light emitting display.

Optionally, the display screen 120 may be a touch display screen, which not only performs image display, but also detects a touch or pressing operation of a user, so as to provide a human-computer interaction interface for the user. For example, in an embodiment, the terminal device 100 may include a touch sensor, which may be embodied as a Touch Panel (TP), and may be disposed on a surface of the display screen 120, or may be partially integrated or entirely integrated inside the display screen 120, so as to form the touch display screen.

It should be understood that in particular implementations, the terminal device 100 further includes a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, positioned over the display screen 120 and covering the front surface of the terminal device 100. In the present embodiment, the so-called finger pressing on the display screen 120 may actually be finger pressing on a cover plate above the display screen 120 or a surface of a protective layer covering the cover plate.

As an alternative implementation, as shown in fig. 1, the fingerprint identification device 130 includes at least one light detection portion 134 and an optical component 132, the light detection portion 134 includes the sensing array and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which can be fabricated on a chip (die) by a semiconductor process; the optical element 132 may be disposed above the sensing array of the light detecting portion 134, and may specifically include a filter layer (filter) for filtering out ambient light penetrating through the finger, a light guide layer for guiding fingerprint detection light formed by reflection or scattering from the surface of the finger to the sensing array for optical detection, and other optical elements.

In particular implementations, the plurality of optical components 132 may be packaged with the at least one light detecting portion 134 on the same optical fingerprint chip. The light guide layer can be a lens (lens) layer made of a semiconductor silicon wafer, the lens (lens) layer is provided with a plurality of lens units, reflected light reflected from a finger is received by the optical sensing unit below the lens unit, and accordingly, the sensing array can detect a fingerprint image of the finger.

The embodiment of the application can be applied to electronic equipment with one fingerprint identification device and one fingerprint detection area, and also can be applied to electronic equipment with a plurality of fingerprint identification devices and a plurality of fingerprint detection areas.

It should be understood that in the embodiments of the present application, the optical sensor may also be referred to as an image sensor, a photoelectric sensor or a fingerprint sensor, and the optical sensor may be fabricated as a chip through a semiconductor process, that is, the chip includes the image sensor.

Under some circumstances, optical sensor in this application embodiment also can be called optical fingerprint device, optics fingerprint identification module, fingerprint device, fingerprint identification module, fingerprint collection device etc..

The current technology of fingerprint identification under a screen is basically applied to a self-luminous mobile phone screen such as an OLED (organic light emitting diode) or an active-matrix organic light emitting diode (AMOLED), and self-luminous pixels of the OLED screen are used as light source light rays to irradiate a finger, pass through the reflection of the finger and the gap between the pixels of the OLED screen, and be received by a fingerprint sensor under the screen, so that the collection and fingerprint identification of a fingerprint image are realized.

However, the LCD screen is different from the OLED screen in that the LCD screen uses a backlight module to provide a backlight source, and the backlight emitted from the backlight module can illuminate the liquid crystal panel to make the liquid crystal panel display images.

Fig. 2 is a schematic view of the structure of an LCD screen. The LCD screen may include a glass cover plate 230, a liquid crystal panel 240, and a backlight module 220. The glass cover 230 may be disposed above the liquid crystal panel 240, the liquid crystal panel 240 may include a liquid crystal layer, and the backlight module 220 is disposed below the liquid crystal panel 240 and may include a brightness enhancement film 250, a light uniformizing film 260, a light guide plate 270, a reflective film 280, and a steel plate reinforcement 290, which are stacked. As an alternative embodiment, the LCD display screen may also be a touch display screen, which includes a touch layer, and the touch layer may be disposed between the glass cover 230 and the liquid crystal panel 240, or may be partially or wholly integrated inside the liquid crystal panel 240. In addition, the glass cover plate 230 may be attached to the liquid crystal panel to form a panel assembly 210.

Taking light with a wavelength of 850nm as an example, the light transmittance of each film layer of the backlight module is shown in table 1.

TABLE 1

Film layer of backlight module	Light transmittance
		Reflective film	1.00％
Light guide plate	60％
		Brightness enhancement film	1.40％
Even light membrane	3.80％
		Steel plate reinforcement	0.00％
Total transmittance	0.00％

As can be seen from table 1, the total transmittance of the backlight module to light is 0%, i.e., the backlight module is opaque.

Fig. 3 is a schematic structural diagram of an LCD screen-based underscreen fingerprint identification system. The backlight module 320 or other light sources can emit light signals to reach the finger through the liquid crystal panel 310, and the fingerprint detection light formed by the reflection of the finger can reach the backlight module 320. However, because of the light-tight property of the backlight module 320, the fingerprint detection light reflected by the finger cannot penetrate through the backlight module and cannot be received by the fingerprint identification module 330 below the LCD screen, and therefore, an optical signal detection loop of the fingerprint under the screen cannot be formed. Wherein, fingerprint identification module 330 can include fingerprint sensor, and this fingerprint sensor can be used to carry out fingerprint identification according to the light signal of received finger reflection or scattering.

Because backlight unit's optical characteristic for the in-process of light signal after the finger reflection transmitting to fingerprint identification module, energy loss is very big, and then leads to unable fingerprint identification of realizing. Therefore, the scheme of directly setting the fingerprint recognition module 330 under the OLED screen below the OLED screen is not suitable for the LCD screen.

In order to realize the under-screen fingerprint recognition of the LCD screen, one way to realize this is to arrange the fingerprint sensor 410 in the non-display area under the glass cover 430 or the liquid crystal panel of the LCD screen, and to arrange the fingerprint detection area 440 in the display area of the LCD screen by the optical path design, as shown in fig. 4. That is, the fingerprint sensor 410 is not disposed below the backlight assembly 420, but disposed above the backlight assembly 420 or disposed beside the backlight assembly 420. In this way, the detection light provided by the fingerprint excitation light source (also referred to as fingerprint excitation light) is reflected or scattered by the finger above the fingerprint detection region 440 of the LCD screen to form fingerprint detection light, and the fingerprint detection light can return to the fingerprint sensor 410 after passing through the glass cover plate and the liquid crystal panel, that is, the fingerprint detection light can reach the fingerprint sensor 410 without passing through the backlight module 420, and is received by the fingerprint sensor 410 to detect fingerprint information or a fingerprint image of the finger, so that the under-screen fingerprint identification of the LCD screen can be realized.

Fingerprint sensor sets up in backlight unit's top, can understand as fingerprint sensor setting in backlight unit's top, the below of glass apron, and fingerprint sensor can set up between backlight unit and glass apron promptly.

Fingerprint sensor sets up on backlight unit's next door, can understand that fingerprint sensor can roughly set up in the same layer with backlight unit, all is located the below of glass apron, and backlight unit's size can be less than the size of glass apron.

The display area of the liquid crystal display (i.e. the LCD screen) mentioned in the embodiment of the present application refers to an area where the liquid crystal panel can display a picture, and specifically refers to an area on the liquid crystal display that can be illuminated by the backlight module.

In order to increase the area of the fingerprint detection area, the under-screen fingerprint identification device provided by the embodiment of the present application may further include a first reflection device 460, as shown in fig. 5, in addition to the fingerprint sensor 410. The first reflecting means 460 may be disposed toward the photosensitive surface of the fingerprint sensor 410 for reflecting fingerprint detection light formed by reflection or scattering of a finger above a fingerprint detection area of the LCD screen and returned through the liquid crystal panel to the fingerprint sensor 410. The fingerprint recognition device may further include an optical lens 470, and the optical lens 470 may be disposed vertically or obliquely in front of the first reflection means 460, where the fingerprint detection light formed by the reflection or scattering of the finger is transmitted to the fingerprint detection path of the fingerprint sensor 410, and the fingerprint detection light first passes through the optical lens 470 and then is transmitted to the first reflection means. The optical lens 470 can focus the fingerprint detection light to the first reflection device 460, so that the first reflection device 460 can further reflect the fingerprint detection light to the fingerprint sensor 410. Since the first reflecting device 460 can reflect the fingerprint detection light before the fingerprint detection light is received by the fingerprint sensor 410, the path of the light incident to the fingerprint sensor 410 by the reflected light can be extended, so that the area of the fingerprint detection area can be increased, more light can be incident to the fingerprint sensor 410, and the success rate of fingerprint identification is improved.

Optionally, the fingerprint recognition device may further include a light emitting unit 450, and the light emitting unit 450 may be located below the non-display area of the glass cover 430 and configured to emit a light signal to the display screen to provide a light source for fingerprint recognition.

Further, the embodiment of the application also provides another underscreen fingerprint identification device, and the area of a fingerprint detection area can be further increased. As shown in fig. 6, the underscreen fingerprint identification device is applied to an electronic device having an LCD screen, which may include a glass cover plate 501, a liquid crystal panel 502 and a backlight module 503. The LCD screen has a display area and a non-display area, wherein the display area is an area where the liquid crystal panel 502 displays a picture, and therefore, the LCD screen can also be referred to as the display area of the liquid crystal panel 502; the non-display area may be an area located at an edge of the liquid crystal panel 502 (for example, a chin area of a terminal device such as a smart phone), wherein the fingerprint detection area 570 of the under-screen fingerprint recognition device is located in the display area of the LCD screen, and the under-screen fingerprint recognition device may be disposed below the non-display area of the liquid crystal panel 502 of the LCD screen and above the backlight module 503.

The underscreen fingerprint identification device may include a first reflecting device 510, a second reflecting device 530, an optical lens 540, and a fingerprint sensor 520. The second reflection device 530, the optical lens 540, the first reflection device 510, and the fingerprint sensor 520 are sequentially disposed in the underscreen fingerprint detection optical path of the underscreen fingerprint identification device, wherein the second reflection device 530 and the first reflection device 510 respectively reflect the fingerprint detection light before and after the optical lens 540 converges the fingerprint detection light formed by reflection or scattering from a finger, that is, the fingerprint detection light is secondarily reflected before entering the fingerprint sensor 520, thereby increasing the underscreen fingerprint identification optical path.

Specifically, the second reflecting device 530 may be disposed in front of the optical lens 540, and may be configured to receive fingerprint detection light that is formed by reflection or scattering of a finger above the fingerprint detection area 570 of the LCD screen and passes through the glass cover 501 and the liquid crystal panel 502, and that carries fingerprint information of the finger because the fingerprint detection light is returned light formed by reflection or scattering of the finger; also, the second reflecting device 530 may further reflect the received fingerprint detection light for the first time, so that the fingerprint detection light is transmitted to the optical lens 540, and the optical lens 540 may focus and guide the fingerprint detection light to the first reflecting device 510. The first reflecting device 510 may then reflect the fingerprint detection light it receives a second time to transmit the fingerprint detection light to the fingerprint sensor 520.

The reflective surface of the second reflective device 530 may face the liquid crystal panel of the LCD screen, and the reflective surface of the first reflective device 510 and the reflective surface of the second reflective device 530 are disposed opposite to each other, that is, the reflective surface of the first reflective device 510 faces the reflective surface of the second reflective device 530, so that the fingerprint detection light reflected by the second reflective device 530 can reach the first reflective device 510 after being converged by the optical lens 540. The optical lens 540 is disposed between the first reflecting device 510 and the second reflecting device 530 in a side-up manner, and is capable of focusing the fingerprint detection light reflected by the second reflecting device 530 to the first reflecting device 510. The light-sensing surface of the fingerprint sensor 520 faces the first reflecting device 510 for receiving the fingerprint detection light reflected by the first reflecting device 510 and detecting the fingerprint information or fingerprint image of the finger based on the fingerprint detection light.

The optical lens 540 may be disposed vertically with respect to the LCD screen, or may have a certain inclination angle with respect to the LCD screen. In particular, the optical lens 540 may include at least one lens and an aperture stop, wherein a non-aligned (off-center) design is employed between the center of the aperture stop and the optical center of the at least one lens to improve optical performance. In addition, the first reflecting device 510 and the second reflecting device 530 may be both mirrors.

Because the fingerprint detection light returning from the finger and passing through the liquid crystal panel needs to be reflected twice by the two reflecting devices before being incident on the fingerprint sensor 540, the light path incident on the fingerprint sensor can be further increased by adopting the two reflecting devices, so that the effective area of the fingerprint detection area on the LCD screen can be further increased, therefore, the detection light provided by the light source can be reflected or scattered by the finger above the fingerprint detection area on the LCD screen to form more fingerprint detection light which is incident on the fingerprint sensor, and the success rate of fingerprint identification is improved.

The under-screen fingerprint identification device shown in fig. 6 does not greatly affect the thickness and width of the fingerprint identification device while increasing the area of the fingerprint detection area of the LCD screen, so that the scheme can be beneficial to thinning the thickness of the electronic equipment, reducing the area of the non-display area of the electronic equipment and improving the screen area ratio of the electronic equipment.

As a variant of the under-screen fingerprint identification device shown in fig. 6, the second reflecting means 530 of the under-screen fingerprint identification device may also extend at least partially below the display area of the LCD screen; the transmission wavelength of the second reflection device 530 may include a wavelength capable of transmitting a backlight (i.e., visible light) emitted by the backlight module 503, and the reflection wavelength may include a wavelength of a detection light emitted by the fingerprint detection light source, i.e., a wavelength capable of reflecting the fingerprint detection light formed by the detection light irradiating a finger and passing through the liquid crystal panel 502. By adopting the scheme, the width of the fingerprint identification device under the screen can be further reduced, so that the area of a non-display area of the LCD screen is smaller, the front screen occupation ratio of the electronic equipment is more favorably improved, and the overall appearance of the ultra-narrow chin is realized.

In the structure of the under-screen fingerprint recognition apparatus shown in fig. 6, the light signals 505 and 506 incident to the both side edge positions of the fingerprint sensor 520 determine the edge positions of the fingerprint detection region 570, thereby determining the area of the fingerprint detection region 570 for fingerprint recognition in the display region of the LCD screen. For convenience of description, the optical signal 505 is referred to as a far-end optical signal, and the optical signal 506 is referred to as a near-end optical signal.

In the design of the optical path of the under-screen fingerprint device, the optical paths of the far-end optical signal 505 and the near-end optical signal 506 may be determined according to the edge position of the fingerprint sensor 520, the position of the first reflecting device 510, and the position and the curvature radius of the optical lens 540.

Generally, the fingerprint sensor 520 is a chip structure, and after the optical signal reaches the fingerprint sensor, a part of light may be reflected on the surface of the fingerprint sensor, as shown in fig. 7, and after the near-end optical signal 506 reaches the fingerprint sensor 520, the light may be reflected on the surface of the fingerprint sensor 520, forming an interference optical signal 507, as shown by a dotted line in fig. 7. The disturbing light signal 507, when transmitted to the first reflecting means 510, is reflected again at the surface of the first reflecting means 510 and then returns to the fingerprint sensor 520 again. The interference light signal 507 reaching the fingerprint sensor 520 and being received by the sensing array of the fingerprint sensor 510 will interfere with the fingerprint imaging of the fingerprint sensor 520, affecting the fingerprint detection.

Based on the above problem, this application embodiment further provides a fingerprint identification device under screen suitable for LCD screen, and this fingerprint identification device under screen can reduce the interference that causes the fingerprint sensor formation of image when carrying out fingerprint identification.

The fingerprint identification device can be applied to electronic equipment with an LCD screen, the under-screen fingerprint identification device can be arranged below a non-display area of a liquid crystal panel of the LCD screen, and a fingerprint detection area of the under-screen fingerprint identification device is positioned in a display area of the LCD screen.

Alternatively, the electronic device may refer to a smart phone, a tablet computer, or another mobile terminal, and the non-display area of the LCD screen may correspond to a chin area of the mobile terminal, that is, the under-screen fingerprint identification device may be disposed below a liquid crystal panel in the chin area of the mobile terminal.

As shown in fig. 8, the under-screen fingerprint identification device may include a fingerprint sensor 520 and a first reflection device 510, wherein the first reflection device 510 is disposed toward a photosensitive surface of the fingerprint sensor 510, and includes a light reflection region 511 and a non-light reflection region 512, the light reflection region 511 is configured to receive fingerprint detection light that is formed by reflection or scattering of a finger above a fingerprint detection region of an LCD screen and passes through a liquid crystal panel, and reflect the received fingerprint detection light to the fingerprint sensor 520, wherein the fingerprint detection light carries fingerprint information of the finger. The fingerprint sensor 520 is configured to receive the fingerprint detection light reflected by the first reflecting device 510 and detect the fingerprint information or fingerprint image of the finger according to the fingerprint detection light.

The fingerprint detection light may be return light formed by irradiating a finger above a fingerprint detection area of the LCD screen with detection light emitted from a light source for fingerprint detection (also referred to as a fingerprint detection light source or a detection light source) and returning through the liquid crystal panel, wherein the light source may be a non-visible light source having a specific wavelength, and may be disposed below an edge area below the LCD screen, such as a glass cover plate or an edge of the liquid crystal panel, and emit the detection light toward the fingerprint detection area of the LCD screen.

The fingerprint detection light received by the light reflecting region of the first reflecting device 510 may refer to that the light reflecting region 511 of the first reflecting device 510 directly receives the fingerprint detection light passing through the liquid crystal panel; alternatively, the light reflection region 511 of the first reflection device 510 may indirectly receive the fingerprint detection light passing through the liquid crystal panel, for example, the fingerprint detection light passing through the liquid crystal panel may first be reflected by another reflection device and/or optically processed by another light source element before reaching the first reflection device 510. As shown in fig. 8, the optical signal reflected by the finger reaches the first reflecting device 510 after being reflected by the second reflecting device 530 and optically focused by the optical lens 540.

The light-reflecting region 511 of the first reflecting device 510 may be designed by size, structure, or position, or by matching with the light path design of the second reflecting device 530 and the optical lens 540, so that the light signal formed by the reflection of the fingerprint detection light reflected from the light-reflecting region 511 to the fingerprint sensor 520 on the surface (e.g., photosensitive surface) of the fingerprint sensor 520 cannot enter the light-reflecting region 511 again. For example, the first reflecting device 510 may further be provided with a non-reflective area 512, the light signal formed by the reflection of the fingerprint detection light on the surface of the fingerprint sensor 520 only enters the non-reflective area 512 of the first reflecting device 510 at most, and since the non-reflective area 512 of the first reflecting device 510 does not reflect light, the interference light signal formed by the reflection of the light signal reflected by the fingerprint sensor 520 by the first reflecting device 510 to the fingerprint sensor 520 again can be avoided, so as to interfere with the fingerprint imaging of the fingerprint sensor 520.

In this embodiment, the light reflection region 511 of the first reflection device 510 is designed such that the light signal formed by the reflection of the fingerprint detection light on the surface of the fingerprint sensor 520 cannot enter the light reflection region 511, which means that the light reflection region 511 of the first reflection device 510 can prevent a part of the light signal formed by the reflection on the surface of the fingerprint sensor 520 from entering the light reflection region 511, or that all the light signal formed by the reflection on the fingerprint sensor 520 cannot enter the light reflection region 511.

Of course, in other alternative embodiments, the optical signal reflected by the surface of the fingerprint sensor 520 cannot reach the fingerprint sensor 520 even though the optical signal is transmitted to the first reflecting device 510 and reflected again by the first reflecting device 510 due to the internal structure design or the optical path design of the underscreen fingerprint identification device, so that the fingerprint imaging of the fingerprint sensor 520 is not disturbed.

As described above, the design of the light reflecting region 511 of the first reflecting means 510 may include the position design, the structural design and the size design of the light reflecting region 511. The position of the light reflecting area 511 may include the position of the light reflecting area 511 of the first reflecting means 510 in the underscreen fingerprint identification device, and the size of the light reflecting area 511 may include the length and width of the light reflecting area 511. In the embodiment of the present application, the light reflection area 511 of the first reflection device 510 may have a preset length and width, and may be set in the under-screen fingerprint identification device by: the first reflective device 510 faces the fingerprint sensor 520 and is parallel to the photosensitive surface of the fingerprint sensor 520, and the light-reflecting region 511 of the first reflective device 510 is closer to the optical lens 540 than the photosensitive surface of the fingerprint sensor 520, i.e. the center of the light-reflecting region 511 is offset from the center of the photosensitive surface of the fingerprint sensor 520, e.g. the light-reflecting region 511 only partially covers the photosensitive surface of the fingerprint sensor 520 at most, so as to prevent the fingerprint detection light formed by reflection or scattering of a finger from reaching the light-reflecting region 511 of the first reflective device 510 again even if a part of the light is reflected again on the surface of the fingerprint sensor 520 after being reflected to the fingerprint sensor 510 by the light-reflecting region of the first reflective device 510.

As an implementation manner, as described above, the first reflecting device 510 may further include a non-light reflecting region 512, and the non-light reflecting region 512 may be adjacent to the light reflecting region 511 and cover the photosensitive surface of the fingerprint sensor 520. For example, the non-reflective regions 512 may completely cover the photosensitive surface of the fingerprint sensor 520 or only partially cover the photosensitive surface of the fingerprint sensor 520. The non-reflective region 512 can be configured to receive at least a portion of the light signal reflected from the surface of the fingerprint sensor 520 to prevent the light signal from entering the reflective region 511.

Specifically, in this implementation, the first reflecting device 510 may include a light reflecting region 511 and a non-light reflecting region 512, wherein the light reflecting region 511 has light reflecting capability and may be used for reflecting light signals; the non-reflective regions 512 are not light reflective, and the non-reflective regions 512 may be implemented by providing a non-reflective coating or a light absorbing layer, for example, by blacking the non-reflective regions 512, as shown in fig. 8. The light reflection region 511 is used for receiving the fingerprint detection light formed by the reflection or scattering of the finger and passing through the liquid crystal panel and reflecting the received fingerprint detection light to the fingerprint sensor 520, and the fingerprint detection light enters the non-light reflection region 512 through a part or all of the light signal formed by the reflection of the surface of the fingerprint sensor 520, so that the light signal reflected by the fingerprint sensor 520 is blocked from being reflected again by the first reflection device 510 to become an interference light signal and reenter the fingerprint sensor 520, thereby affecting the fingerprint imaging of the fingerprint sensor 520.

As another implementation, the first reflecting means 510 may also comprise only the light reflecting area 511, i.e. the length of the first reflecting means 510 is defined by the size of the light reflecting area 511. According to the scheme, on the basis of the original technology, the length of the first reflecting device 510 is shortened, the first reflecting device 510 is arranged at a proper position above the fingerprint sensor 520, for example, the first reflecting device 510 deviates from the fingerprint sensor 520 by a preset distance, so that an optical signal formed by reflecting on the surface of the fingerprint sensor 520 cannot reach the first reflecting device 510 and is reflected into the fingerprint sensor 520 again, and the interference on the fingerprint imaging of the fingerprint sensor 520 is avoided.

Optionally, the fingerprint sensor 520 may receive a first light signal 506, the first light signal 506 being a light signal received by a portion of the optical sensing unit of the fingerprint sensor 520 located close to the fingerprint detection area of the LCD screen, i.e. the first light signal 506 may correspond to a near-end light signal received by the fingerprint sensor 520. Even if a part of the first optical signal 506 is reflected on the surface of the fingerprint sensor 520, the optical signal cannot enter the reflective area 511. If the first reflecting means 510 comprises the non-reflective area 512, in the under-screen fingerprint identification device shown in fig. 8, the first light signal 506 enters the non-reflective area 512 after being reflected by the surface of the fingerprint sensor 520. As described above, as long as the optical signal formed by the reflection of the near-end optical signal by the surface of the fingerprint sensor 520 does not reach the light reflection area 511, it is ensured that all the optical signals formed by the reflection of the fingerprint detection light by the fingerprint sensor 520 do not reach the light reflection area 511, and the interference with the fingerprint imaging by the fingerprint sensor 520 can be further reduced.

The position of the fingerprint sensor 520 close to the fingerprint detection area of the LCD screen may refer to an area of the fingerprint sensor 520 closest to the light incident direction, for example, in fig. 7 or 8, may refer to an area of the rightmost end of the fingerprint sensor 520; therefore, the fingerprint detection light received by the optical sensing unit at the above position can be the near-end light signal of the fingerprint sensor 520.

The light-reflecting region 511 can also receive a second light signal 505, where the second light signal 505 is a light signal received by a portion of the optical sensing unit of the fingerprint sensor 520 located at a position far away from the fingerprint detection region of the LCD screen, i.e. the second light signal 505 corresponds to a far-end light signal received by the fingerprint sensor 520. In the embodiment shown in fig. 8, the reflection position of the second optical signal 505 in the light reflection region 511 of the first reflection device 510 is close to the edge position of the light reflection region 511, so that the far-end optical signal that can be received by the fingerprint sensor 520 can be focused by the optical lens 540 to the light reflection region 511 of the first reflection device 510 after the first reflection of the second reflection device 530 through the design of the internal optical path of the underscreen fingerprint identification device, so that most of the effective optical signals of the fingerprint detection light can be received by the fingerprint sensor 520, and the detection performance of the fingerprint sensor 520 can be improved.

The position of the fingerprint sensor 520 far from the fingerprint detection area may specifically refer to an area of the fingerprint sensor 520 farthest from the light incidence direction, for example, in fig. 7 or 8, may refer to an area at the leftmost end of the fingerprint sensor 520; therefore, the fingerprint detection light received by the optical sensing unit at the above position can be the far-end light signal of the fingerprint sensor 520.

In the embodiment of the present application, the far-end optical signal may be an optical signal reflected from an edge position of the light reflecting area of the first reflecting device 510 to the fingerprint sensor 520.

It can be seen that the size and position of the light reflection area 511 of the first reflecting means 510 can be determined according to the point 513 of the second reflection of the first light signal 506 at the first reflecting means 510 and the point 514 of the second light signal 505 at the first reflecting means 510. Alternatively, or in other words, the position of the non-reflective region 512 may be determined according to the point 513 of the first optical signal 506 at the first reflecting device 510 and the point 514 of the second optical signal 505 at the first reflecting device 510. The second reflection point 513 of the first optical signal 506 on the first reflection device 510 is where the first optical signal 506 is reflected by the reflection region 511 of the first reflection device 510 to the fingerprint sensor 520, and a part of the first optical signal is reflected again by the surface of the fingerprint sensor 520 to reach the first reflection device 510. The reflection point 514 of the second optical signal 505 on the first reflection device 510 means a position where the second optical signal 505 is focused by the optical lens 540 to reach a reflection area of the first reflection device 510 and reflected.

The embodiment of the application can set the area from the end of the first reflecting device 510 far away from the fingerprint sensor 520 to the second reflecting point 513 of the first optical signal 506 of the first reflecting device 510 as the non-reflective area 512, so as to avoid interference on the fingerprint imaging of the fingerprint sensor 520. In addition, the non-reflective region 512 is also required to avoid affecting the reflection of the second optical signal 505 at the reflective region 511 of the first reflective device 510.

In the embodiment of the present application, the light reflection region 511 can enable the second light signal 505 to be reflected to the fingerprint sensor 520 by the light reflection region 511, so as to ensure that the light signal of the fingerprint detection region of the LCD screen can be received by the fingerprint sensor 520, thereby improving the fingerprint detection performance. Meanwhile, the non-reflective area 512 can prevent the optical signal reflected by the surface of the fingerprint sensor 520 from being reflected again by the first reflecting device 510 and entering the fingerprint sensor 520 again, so as to avoid interference on the fingerprint imaging of the fingerprint sensor 510.

In case that the fingerprint recognition device includes two reflection means, the second reflection means may be close to the fingerprint detection area of the liquid crystal display, i.e., the center of the second reflection means is closer to the fingerprint detection area than the centers of the first reflection means and the fingerprint sensor. The reflecting surface of the second reflecting device and the sensing surface of the fingerprint sensor can face the liquid crystal panel, and the reflecting surface of the first reflecting device can face the photosensitive surface of the fingerprint sensor.

The technical scheme described above can be applied to an underscreen fingerprint identification device comprising one reflection device, and can also be applied to an underscreen fingerprint identification device comprising two or more reflection devices, and no matter the underscreen fingerprint identification device comprises several reflection devices, the light reflection region of the reflection device facing the fingerprint sensor can be designed in structure, size or position, so that the light signal reflected by the fingerprint sensor can be reduced from reaching the light reflection region again and being reflected to the fingerprint sensor again, and the influence on the fingerprint imaging of the fingerprint sensor is reduced.

However, with the development of technology, in order to pursue the beauty and the screen occupation ratio of electronic devices (such as mobile phones, tablet computers and other mobile intelligent terminals), the requirements of users on the thickness and the chin width of the electronic devices are higher and higher, so that the thickness and the width of the under-screen fingerprint identification device left on the LCD screen are also limited, and the size of the under-screen fingerprint identification device is limited. After the size of the fingerprint identification device is limited, the area of a fingerprint detection area of an LCD screen can be influenced, and if the area of the fingerprint detection area is too small, the success rate of fingerprint identification can be influenced. That is, after the size of the under-screen fingerprint identification device of the LCD screen becomes smaller, the amount of signals of the fingerprint detection light formed by the reflection or scattering of the finger received by the under-screen fingerprint identification device becomes smaller, thereby affecting the success rate of fingerprint identification.

As shown in fig. 6, after the structure of the underscreen fingerprint identification device is determined, the optical paths of the near-end optical signal 506 and the far-end optical signal 505 are determined. The reflection path of the far-end optical signal 505 at the first reflecting device 510 can be determined according to the end point position of the fingerprint detection area of the fingerprint sensor 520 far from the LCD screen, the structure, size and position of the first reflecting device 510 and the optical lens 540. Accordingly, the position of the fingerprint detection area of the LCD screen where the fingerprint sensor 520 can receive the fingerprint detection light can be inversely deduced according to the direction of the optical path of the first reflecting means 510, thereby enabling the boundary position of the fingerprint detection area to be determined.

In the structure of the under-screen fingerprint identification device shown in fig. 6, the first reflection device 510 and the second reflection device 530 are arranged in parallel, assuming that the angle between the incident light and the reflected light of the second reflection device 530 formed by the reflection or scattering of the detection light provided by the light source at the finger above the fingerprint detection area 570 of the LCD screen and the fingerprint detection light passing through the liquid crystal panel 502 is α, the angle between the incident light and the reflected light of the first reflection device 530 after the reflected light of the second reflection device 520 is focused by the optical lens 540 is β, wherein the angle β can be determined according to the end position of the fingerprint sensor 520 far away from the fingerprint detection area 570, the structures, sizes and positions of the first reflection device 510 and the optical lens 540, and the angle α can also be derived according to the reflection principle, so that the positions of the near-end optical signal 506 and the far-end optical signal 505 on the fingerprint detection area 570 of the LCD screen can be determined, the location and area of the fingerprint detection region 570 can thus be determined.

As can be seen from the above, after the position of the off-screen fingerprint identification device is determined, the area of the fingerprint detection area 570 on the LCD screen is determined, and generally, the area of the fingerprint detection area 570 cannot be increased.

In order to meet the design requirement of narrow chin of electronic equipment, the size of the under-screen fingerprint identification device suitable for the LCD screen needs to be reduced correspondingly, but as described above, if the size of the under-screen fingerprint identification device is reduced, the area of the fingerprint detection area of the LCD screen determined by the near-end optical signal and the far-end optical signal is reduced, thereby affecting the fingerprint identification performance of the fingerprint sensor.

Based on the above problem, the embodiment of the application provides a fingerprint identification device under screen, can guarantee fingerprint identification's success rate after fingerprint identification device's size is limited.

The device for identifying fingerprints under a screen can be applied to an electronic device having a liquid crystal display (LCD screen), and the device for identifying fingerprints under a screen can be disposed under a non-display area of the liquid crystal display, such as a non-display area of a liquid crystal panel of the liquid crystal display, which is generally used as a wiring area and a driving chip mounting area of the liquid crystal panel. Similar to the embodiment shown in fig. 6, the under-screen fingerprint identification device may also include a fingerprint sensor, a first reflection device and a second reflection device, wherein at least one of the first reflection device and the second reflection device may have a preset inclination angle with respect to the sensing surface of the fingerprint sensor, for example, when one of the first reflection device and the second reflection device is parallel to the sensing surface of the fingerprint sensor, the first reflection device may be arranged to be inclined with respect to the second reflection device.

Under the condition that the first reflecting device is obliquely arranged relative to the second reflecting device, the fingerprint detection light formed by reflection or scattering of a finger above the fingerprint detection area of the LCD screen can comprise a third light signal, and the third light signal reaches the first reflecting device after being reflected by the second reflecting device and focused by the optical lens and is reflected to the position, far away from the fingerprint detection area, of the fingerprint sensor through the first reflecting device.

Under the condition that the first reflecting device and the second reflecting device are arranged in parallel, the fingerprint detection light formed by the reflection or scattering of the finger above the fingerprint detection area of the LCD screen comprises a fourth light signal, and the fourth light signal reaches the first reflecting device after being reflected by the second reflecting device and focused by the optical lens and is reflected to the position, far away from the fingerprint detection area, of the fingerprint sensor by the first reflecting device.

The included angle between the incident light and the reflected light of the second reflecting device of the third optical signal is larger than the included angle between the incident light and the reflected light of the second reflecting device of the fourth optical signal.

Optionally, the third light signal and the fourth light signal may also refer to far-end light signals that the fingerprint sensor can receive respectively in two scenarios, that is, the first reflecting device and the second reflecting device are arranged obliquely and arranged in parallel.

As shown in fig. 9 and 10, when the first reflecting device 510 and the second reflecting device 530 are relatively parallel, an incident light ray and a reflected light ray of the far-end optical signal 505 (or referred to as a fourth optical signal 505) at the second reflecting device 530 form an included angle α 2; when the first reflecting device 510 and the second reflecting device 530 are disposed obliquely with respect to each other, an angle formed by an incident light ray of the far-end optical signal 504 (or referred to as the third optical signal 504) at the second reflecting device 530 and a reflected light ray is α 1. In the embodiment of the present application, the first reflection device 510 and the second reflection device 530 are disposed in a relatively inclined manner, so that the included angle α 1 is greater than the included angle α 2, and the far-end optical signal 504 can have a larger inclined angle compared with the display surface of the LCD screen, thereby increasing the area of the fingerprint detection area of the LCD screen. Therefore, the first reflection device 510 and the second reflection device 530 are arranged in a relatively inclined manner, so that the area of the fingerprint detection area of the screen lower fingerprint identification device on the LCD screen can be increased, the success rate of fingerprint identification is improved, and the fingerprint detection performance is improved.

Therefore, after the size of the under-screen fingerprint identification device is limited, the scheme of the embodiment of the application can ensure that the area of the under-screen fingerprint identification device in the fingerprint detection area of the LCD screen is not reduced even if the under-screen fingerprint identification device with a small size is adopted, so that the fingerprint detection performance is influenced. In other words, the area of the fingerprint detection area can be increased by the under-screen fingerprint identification device provided by the embodiment of the application under the condition that the same device size is adopted, and on the premise that the fingerprint detection performance is not influenced, the width of the chin area of the electronic equipment can be further reduced by reducing the whole size of the under-screen fingerprint identification device, so that the screen occupation ratio is improved.

In a specific embodiment, the first reflecting device is obliquely arranged relative to the second reflecting device, and the first reflecting device and the second reflecting device are obliquely arranged.

In one implementation, as shown in fig. 9, the first reflective device 510 is disposed obliquely with respect to the photosensitive surface of the fingerprint sensor 520, i.e. the first reflective device 510 has a first inclination angle with respect to the photosensitive surface of the fingerprint sensor 520, and the second reflective device 530 is disposed parallel to the photosensitive surface of the fingerprint sensor 520, e.g. the first reflective device 510 is tilted by a certain angle in a counterclockwise direction, so that the included angle α 1 can be larger than the included angle α 2. Since the sensing surface of the fingerprint sensor 520 is parallel to the display surface of the LCD screen, the inclination of the first reflecting device 510 is equivalent to a predetermined inclination angle with the display surface of the LCD screen.

As a preferred embodiment, the first inclination angle of the first reflecting device 510 with respect to the sensing surface of the fingerprint sensor 520 may be greater than 0 and less than or equal to 2 °.

If the first reflecting means is horizontally arranged, as in the first reflecting means in FIG. 9Device 510^，，In the position, the area of the fingerprint detection area 570 of the LCD screen may be the area defined by the far-end optical signal 505 and the near-end optical signal 506, and the optical signal between the far-end optical signal 505 and the near-end optical signal 506 may be reflected by the second reflection device 530 for the first time, focused by the optical lens 540, and the first reflection device 510^，，Reaches the fingerprint sensor 520 after the second reflection, and other optical signals outside the area defined by the far-end optical signal 505 and the near-end optical signal 506 cannot be transmitted to the fingerprint sensor 520.

When the first reflection device is tilted, as shown in fig. 9 where the first reflection device 510 is located, the far-end optical signal that can be received by the fingerprint sensor 520 is changed into the optical signal 504, and due to the tilt of the first reflection device 510, the far-end optical signal 504 that can be received by the fingerprint sensor 520 has a smaller tilt angle compared to the display surface of the LCD screen, which is equivalent to that the far-end optical signal 504 is tilted toward the direction of enlarging the fingerprint detection area 570, so that the area of the fingerprint detection area 570 can be enlarged.

As another implementation manner, as shown in fig. 10, the second reflecting device 530 is disposed obliquely with respect to the photosensitive surface of the fingerprint sensor 520, that is, the second reflecting device 530 has a second inclination angle with respect to the photosensitive surface of the fingerprint sensor 530, and the first reflecting device 510 is disposed parallel to the photosensitive surface of the fingerprint sensor 520, for example, the second reflecting device 530 is inclined by a certain angle in a clockwise direction, so that the included angle α 1 can be larger than the included angle α 2. Since the sensing surface of the fingerprint sensor 520 is parallel to the display surface of the LCD screen, the second reflecting device 530 is tilted at a predetermined tilt angle relative to the display surface of the LCD screen.

As a preferred embodiment, the second inclination angle of the second reflecting means 530 with respect to the sensing surface of the fingerprint sensor 520 may be greater than 0 and less than or equal to 2 °.

If the second reflecting means is horizontally arranged, as shown in FIG. 10 as the second reflecting means 530^，，Where the area of the fingerprint detection area 570 of the LCD screen is defined by the far-end light signal 505 and the near-end light signal 506In the region, the optical signal between the far-end optical signal 505 and the near-end optical signal 506 can pass through the second reflecting device 530^，，The first reflection, the focusing of the optical lens 540 and the second reflection of the first reflecting device 510 reach the fingerprint sensor 520, and other optical signals outside the area defined by the far-end optical signal 505 and the near-end optical signal 506 cannot be transmitted to the fingerprint sensor 520.

After the second reflection device is tilted, as shown in fig. 10 where the first reflection device 530 is located, the far-end optical signal that can be received by the fingerprint sensor 520 is changed into the optical signal 504, and due to the tilt of the second reflection device 510, the far-end optical signal 504 that can be received by the fingerprint sensor 520 has a smaller tilt angle compared to the display surface of the LCD screen, which is also equivalent to that the far-end optical signal 504 is tilted toward the direction of enlarging the fingerprint detection area 570, so that the area of the fingerprint detection area 570 can be enlarged.

As a further implementation, the first reflecting means 510 and the second reflecting means 530 may both be arranged obliquely with respect to the fingerprint sensor, corresponding to the case of combining the first reflecting means 510 of fig. 9 and the second reflecting means 530 of fig. 10. Since the first reflecting means 510 and the second reflecting means 530 are independently inclined to increase the area of the fingerprint detection region 570, the area of the fingerprint detection region 570 can also be increased when the first reflecting means 510 and the second reflecting means 530 are both inclined in opposite inclination directions in the manner of referring to fig. 9 and 10. The inclination angle of the first reflecting device 510 with respect to the second reflecting device 530 may be greater than 0 and less than or equal to 4 °, and preferably, the inclination angle of the first reflecting device 510 with respect to the second reflecting device 530 is greater than 0 and less than or equal to 2 °.

In the embodiment of the present application, the fingerprint sensor may be disposed in parallel with respect to the liquid crystal panel. The reflection means is arranged obliquely with respect to the fingerprint sensor, which is also understood to mean that the reflection means is arranged obliquely with respect to the liquid crystal panel.

In addition, this application embodiment still provides another kind of fingerprint identification device under screen, and it can make above-mentioned second reflect meter's incident light and reflected light's contained angle alpha 1 be greater than the contained angle alpha 2 that fig. 6 shows equally to can increase the area of fingerprint detection area, improve fingerprint identification's success rate, improve fingerprint detection performance.

In the underscreen fingerprint identification apparatus, the second reflecting means 530 may include a convex mirror. After the second reflection device 530 is convex-processed, the area of the fingerprint detection area can be increased, and the fingerprint detection performance can be improved.

The second reflecting device 530 is processed by the optical path of the convex mirror, so that the far-end optical signal can be inclined towards the direction of increasing the area of the fingerprint detection region, and the near-end optical signal can also be inclined towards the direction of increasing the area of the fingerprint detection region, thereby increasing the area of the fingerprint detection region to a greater extent and improving the fingerprint detection performance.

The specific structure of the convex mirror of the second reflecting device 530 can be as shown in fig. 11. The convex mirror may be embodied as a convex mirror, and the convex mirror may include a substrate 532 and a convex structure 531 formed on the substrate 532, and a surface of the convex structure 531 may be provided with a reflective coating for reflecting a received optical signal. The substrate 532 may be transparent.

In the fingerprint recognition device under screen that this application embodiment provided, when carrying out structure adjustment through to reflect meter, if incline first reflect meter and/or second reflect meter and set up, or change the plane of reflection structure of second reflect meter (if design the second reflect meter for having convex mirror), increase the scheme of the regional area of fingerprint detection, through selecting suitable inclination and/or plane of reflection structure, can guarantee that the distortion degree of fingerprint sensor formation of image is in controllable range, just so can avoid causing the influence to fingerprint sensor's fingerprint formation of image.

Of course, in addition to the second reflecting means being provided as a convex mirror, the embodiment of the present application may increase the area of the fingerprint detection area by providing the first reflecting means with a concave mirror.

The scheme for increasing the area of the fingerprint detection area in the embodiment of the present application may be a combination of the above-described manners, and this is not particularly limited in the embodiment of the present application. For example, the area of the fingerprint detection area may be increased by tilting the first reflecting means and the second reflecting means simultaneously. For another example, the first reflecting means may be tilted and the second reflecting means may be arranged as a convex mirror to increase the area of the fingerprint detection area. The combination of multiple modes can also increase the area of a fingerprint detection area and improve the fingerprint detection performance.

In the embodiment of the present application, by changing the relative positions of the first reflecting device and the second reflecting device, and/or the structures of the first reflecting device and the second reflecting device, the included angle a1 between the incident light and the reflected light of the far-end light signal in the second reflecting device 530 is larger than the included angle a2 between the incident light and the reflected light of the far-end light signal in the second reflecting device 530 when the two reflecting devices are arranged in parallel, so that the area of the fingerprint detection area can be increased.

The device for identifying an underscreen fingerprint of the embodiment of the present application may further include a light emitting unit 550, which serves as a fingerprint excitation light source or a detection light source for providing detection light for fingerprint detection or identification of the fingerprint sensor 520. Specifically, the light emitting unit 550 may be a Light Emitting Diode (LED).

Further, a Flexible Printed Circuit (FPC) board 590 may be connected to the underscreen fingerprint identification device, the FPC board 590 may be an internal circuit board of the underscreen fingerprint identification device or an external circuit board for connecting the underscreen fingerprint identification device to an external circuit, and the light-emitting unit 550 may be directly attached to the FPC board 590, for example, the light-emitting unit 550 and the fingerprint sensor 520 may be disposed on the same FPC board 590. The light emitting unit 550 and the fingerprint sensor 520 as in fig. 6-10 are both disposed on the same FPC board 590.

Generally, the underscreen fingerprint identification device can be mounted on an FPC board, and then the FPC board is electrically connected to other functional modules or circuits of the electronic device, so as to connect the underscreen fingerprint identification device to the electronic device. This application embodiment can effectively utilize the free space of fingerprint recognition device's FPC board under the screen to set up this luminescence unit, can not additionally occupy fingerprint recognition device's under the screen effective space to can not cause the influence to fingerprint sensor's fingerprint detection performance. In addition, the light-emitting unit is easy to install on the FPC board, and the installation is convenient.

Next, as shown in fig. 13, a light guide post 551 may be disposed around the light emitting unit 550, and the light guide post 551 may guide the light signal emitted from the light emitting unit 550 to a fingerprint detection area of the LCD screen to improve the light utilization efficiency of the light emitting unit 550, so that the detection light emitted from the light emitting unit 550 can be irradiated to the finger above the fingerprint detection area as much as possible for fingerprint identification. Secondly, adopt light guide post 551 with the detected light direction of luminescence unit 550 the fingerprint detection area of LCD screen, also can prevent that the optical signal that the luminescence unit sent from directly leaks light to fingerprint sensor, causes the interference to fingerprint sensor's formation of image.

Fig. 12 and 13 show schematic diagrams of a possible structure of a fingerprint identification device provided by an embodiment of the application. Fig. 12 shows a side view of the fingerprint recognition device, and fig. 13 shows a top view of the fingerprint recognition device.

The fingerprint recognition device 500 may be disposed below a non-display area of a liquid crystal display, the liquid crystal display may include a liquid crystal panel 501 having a liquid crystal layer and a backlight module 503 providing backlight for the liquid crystal panel, a cover glass may be further covered above the liquid crystal panel, and a touch layer may be further disposed between the cover glass and the liquid crystal panel. Specifically, the fingerprint recognition device 500 may be disposed below the liquid crystal panel 501 of the liquid crystal display and above the backlight module 503 of the liquid crystal display 510, thereby constituting an underscreen fingerprint recognition device. The liquid crystal display panel has a display area and a non-display area 509 at the edge of the display panel, where the display area is referred to as a display area of the liquid crystal panel 501. The non-display region 509 may be a trace region or a driver chip mounting region at the edge of the liquid crystal panel 501, and the position of the non-display region may also specifically correspond to a chin region of an electronic device.

The fingerprint recognition device 500 includes a light emitting unit 550, and the light emitting unit 550 is used for providing detection light for fingerprint recognition of the fingerprint sensor 520, and may be a non-visible light source, such as an infrared LED. Secondly, a light guide post 551 can be further arranged around the light emitting unit 550, and the light guide post 551 has a function of collimation and guidance, and can guide the light signal emitted by the light emitting unit 550 to the fingerprint detection area of the liquid crystal display 501, so as to improve the utilization rate of the light emitting unit 550. In addition, the light guide post 551 can prevent the light signal emitted by the light emitting unit 550 from leaking to the fingerprint sensor 520, which affects the detection performance of the fingerprint sensor 520.

The fingerprint recognition device 500 may further include a first reflecting device 510, a second reflecting device 530, an optical lens 540, and a fingerprint sensor 520. When a user inputs a fingerprint in the fingerprint detection area of the liquid crystal display, the detection light emitted by the light emitting unit 550 passes through the liquid crystal panel 501 to irradiate a finger above the fingerprint detection area, and the reflected light or the scattered light formed by reflection or scattering of the finger passes through the liquid crystal panel 501 to return to the fingerprint identification device. The fingerprint detection light is reflected by the second reflection device 530 and then reaches the optical lens 540; the optical lens 540 may focus the fingerprint detection light to the first reflecting device 510, and the first reflecting device 510 may reflect the received light signal to the light sensing area 521 (i.e., the area where the sensing array having the optical sensing unit is located) of the fingerprint sensor 520 through the light reflecting area thereof. The fingerprint sensor 520 may detect fingerprint information or a fingerprint image of a finger according to the received light signal to perform fingerprint recognition or fingerprint collection.

Fig. 12 shows the optical paths of the near-end optical signal 506 and the far-end optical signal 505, the near-end optical signal 506 reaching the position of the fingerprint sensor 520 close to the fingerprint detection area after being reflected by the two reflecting

devices

530 and 510, and the far-end optical signal reaching the position of the fingerprint sensor 520 far away from the fingerprint detection area after being reflected by the two reflecting

devices

530 and 510.

In this embodiment, all the components of the fingerprint recognition device 500 can be disposed on the same FPC board 590, which facilitates the installation of the fingerprint recognition device 500 under the liquid crystal display 501 of the electronic device and also improves the integration and reliability of the whole structure.

In addition, the fingerprint identification device may further include a device region 508, where the device region 508 is used to provide peripheral circuits, i.e., circuits or peripheral devices required for fingerprint identification by the fingerprint sensor 520. For example, the device region 508 may be provided with a driving circuit for driving the fingerprint sensor 520 to operate, and a storage unit for storing fingerprint information detected by the fingerprint sensor 520, and the like.

As a possible implementation manner, as shown in fig. 12, the fingerprint identification device 500 may be disposed above a backlight module 503 of the electronic device, so as to provide the electronic device with the off-screen fingerprint identification. This kind of mode can not change the structure of the liquid crystal display of original electronic equipment, if the area of the backlight unit 503 of the liquid crystal display of electronic equipment is bigger, its area has bigger space in the non-display area of liquid crystal display promptly, can directly install the fingerprint identification device at this backlight unit 503, this kind of mounting means is simple, easy to realize. In this structure, the area of the backlight module 503 is larger than the area of the display area of the liquid crystal display panel.

In the embodiment shown in fig. 13, the optical lens 540 is located behind the second reflecting device 530, and a plurality of light emitting units 550 may be respectively disposed at both sides of the second reflecting device 530 and the optical lens 540 and located in front of the fingerprint sensor 520. The plurality of light emitting units 550 positioned in front of the fingerprint sensor 520 may mean that the plurality of light emitting units 550 are closer to the fingerprint detection area 570 than the fingerprint sensor 520.

These optical units 550 adopt above-mentioned mounted position, can be more close to with liquid crystal display's fingerprint detection region, improve the semaphore that shines the regional detection light of this fingerprint detection on the one hand, can make the regional detection light of this fingerprint detection more even in order to obtain the fingerprint detection light of higher quality simultaneously, and, can also avoid this detection light directly to get into this fingerprint sensor 520 and detect out to its fingerprint image as far as possible and cause the interference.

The fingerprint recognition device shown in fig. 12 and 13 has a compact structure, and the size of the fingerprint recognition device can be reduced, so that the non-display area of the liquid crystal display screen required to be occupied by the fingerprint recognition device can be reduced, and the screen occupation ratio of the liquid crystal display screen is improved.

The above describes only the case where the fingerprint recognition device includes one reflection device or two reflection devices, but the embodiment of the present application is not limited thereto, and the fingerprint recognition device may further include more reflection devices.

The above-described schemes for reducing interference with imaging of the fingerprint sensor, increasing the area of the fingerprint detection region, and improving the installation position of the light emitting unit may be implemented separately or in combination, and this is not particularly limited in the embodiments of the present application. For example, on the basis of the schemes shown in fig. 9 and 10, in which the area of the fingerprint detection area is increased by obliquely disposing the reflection device, the size and the position of the light reflection area 511 of the first reflection device 510 may be limited or the non-light reflection area 512 may be disposed in combination with the scheme shown in fig. 8, so as to avoid that the light signal reflected by the surface of the fingerprint sensor 520 reaches the fingerprint sensor 520 again after being reflected again by the first reflection device 510, which may interfere with the imaging of the fingerprint sensor 520.

It will be appreciated that the fingerprint recognition apparatus shown in fig. 4-13 are merely schematic diagrams, and the size, structure and proportions of the various elements shown in the figures do not represent the size, structure and proportions of an authentic product.

In addition, it is understood that the structures shown in fig. 4-13 are only one possible implementation manner, and the backlight module in the figures may extend to a position below the fingerprint identification device in the non-display area, that is, the fingerprint identification device is located above the backlight module. However, as another implementation manner, the backlight module in the figure may not extend to the lower side of the fingerprint identification device in the non-display area, that is, the fingerprint identification device is located beside the backlight module, and at this time, the size of the backlight module is substantially the same as the size of the display area of the liquid crystal display screen. Or, the backlight module may also adopt a special-shaped structure, for example, a space is formed by extending downwards at a non-display area of the liquid crystal display screen to accommodate the fingerprint identification device.

As shown in fig. 14, the backlight module has a step region extending downward in the non-display region, and the fingerprint recognition device can be disposed in the step region to reduce the thickness of the electronic device.

The device for identifying fingerprints under a screen provided in the embodiment of the present application is described in detail above, and an electronic device according to the embodiment of the present application is described below with reference to fig. 15, where the electronic device can be used for identifying fingerprints under a screen, and the electronic device can include any one of the devices for identifying fingerprints under a screen described above, so that parts not described in detail can refer to the above description, and are not described again here.

Fig. 15 is a schematic diagram of an electronic device 1300 according to an embodiment of the present application, where the electronic device 1300 is capable of supporting off-screen fingerprint identification, and the electronic device 1300 includes the fingerprint identification apparatus 1320 described above. For example, the electronic device may include a fingerprint recognition device as shown in fig. 7-14.

Optionally, the electronic device 1300 may include a liquid crystal display 1310. The lcd 1310 may include a liquid crystal panel and a backlight module, wherein a glass cover plate may be further disposed above the liquid crystal panel. The liquid crystal display 1310 may include a display area and a non-display area, wherein the fingerprint sensing area of the fingerprint recognition device 1320 is located in the display area of the liquid crystal display 1310, and the fingerprint recognition device 1320 is disposed below the non-display area of the liquid crystal display 1310. The fingerprint recognition device 1320 may receive an optical signal formed by reflection or scattering of a finger above a fingerprint detection area, and detect fingerprint information of the finger according to the received optical signal.

It should be understood that the various components of the underscreen fingerprint identification device are connected by a bus system that includes a power bus, a control bus, and a status signal bus in addition to a data bus.

Although the above embodiments are described primarily in the context of a fingerprint identification device applied to a liquid crystal display for performing fingerprint identification under the display, it should be understood that in other alternative embodiments, the fingerprint identification device provided herein may also be applied to other types of displays, such as OLED displays.

It is to be understood that the terminology used in the embodiments of the present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application.

For example, as used in the examples of this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

If implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, devices and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

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

For example, the division of a unit or a module or a component in the above-described device embodiments is only one logical function division, and there may be other divisions in actual implementation, for example, a plurality of units or modules or components may be combined or may be integrated into another system, or some units or modules or components may be omitted, or not executed.

Also for example, the units/modules/components described above as separate/display components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units/modules/components can be selected according to actual needs to achieve the purposes of the embodiments of the present application.

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

The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. The device is characterized by being suitable for electronic equipment with a liquid crystal display screen, wherein the liquid crystal display screen comprises a liquid crystal panel and a backlight module, and a fingerprint detection area of the device is positioned in a display area of the liquid crystal display screen;

the under-screen fingerprint identification device comprises a fingerprint sensor and a reflection assembly, the fingerprint sensor is arranged below a non-display area of the liquid crystal panel, the reflection assembly comprises a first reflection device and a second reflection device, and the first reflection device faces to a light sensing surface of the fingerprint sensor; the second reflection device is used for reflecting fingerprint detection light which is formed by reflecting or scattering a finger above a fingerprint detection area of the liquid crystal display screen and penetrates through the liquid crystal panel to the first reflection device, the first reflection device is used for reflecting the fingerprint detection light to the fingerprint sensor, and the fingerprint sensor is used for receiving the fingerprint detection light reflected by the first reflection device and detecting fingerprint information of the finger according to the fingerprint detection light.

2. The device of claim 1, wherein the first reflective device comprises a light reflecting region, wherein the light reflecting region is disposed above the fingerprint sensor and prevents light signals generated by the fingerprint detection light reflected by the fingerprint sensor surface from entering the light reflecting region again.

3. The device of claim 2, wherein the light-reflecting region of the first reflecting device is parallel to the light-sensing surface of the fingerprint sensor, and the center of the light-reflecting region is offset from the center of the light-sensing surface of the fingerprint sensor.

4. An underscreen fingerprint identification device according to claim 2 or 3 wherein said first reflecting means further comprises a non-light reflecting region adjacent to said light reflecting region for receiving a light signal formed by reflection of said fingerprint detection light at said fingerprint sensor surface.

5. The device according to any one of claims 2 to 4, wherein the fingerprint sensor comprises a sensing array having a plurality of optical sensing units, and the fingerprint detection light detected by the fingerprint sensor comprises a near-end light signal and a far-end light signal, wherein the near-end light signal is the fingerprint detection light received by the optical sensing unit of the fingerprint sensor close to the fingerprint detection area, and the far-end light signal is the fingerprint detection light received by the optical sensing unit of the fingerprint sensor far from the fingerprint detection area.

6. The underscreen fingerprint identification device of claim 5, wherein the light signal formed after the near-end light signal is partially reflected by the surface of the fingerprint sensor cannot enter the light reflecting region of the first reflecting device.

7. The underscreen fingerprint identification device of claim 5 or 6, wherein the far-end light signal is a light signal reflected from an edge position of the light-reflecting area of the first reflection means to the fingerprint sensor.

8. The device according to any one of claims 1 to 7, further comprising an optical lens disposed vertically or obliquely between the second reflecting means and the first reflecting means for focusing the fingerprint detection light reflected by the second reflecting means onto the first reflecting means.

9. The device for identifying fingerprints of any one of claims 1 to 8, wherein the second reflecting device is close to the fingerprint detection area of the liquid crystal display, and the reflecting surface of the second reflecting device and the sensing surface of the fingerprint sensor face the liquid crystal panel.

10. The device of any one of claims 1-9, wherein at least one of the first and second reflective devices is tilted with respect to a light-sensitive surface of the fingerprint sensor to increase an area of the device in a fingerprint detection area of the liquid crystal display.

11. An underscreen fingerprint identification device according to any one of claims 1-10 wherein the first reflecting means has a first angle of inclination with respect to the light-sensitive surface of the fingerprint sensor and the second reflecting means is parallel to the light-sensitive surface of the fingerprint sensor, wherein the first angle of inclination is greater than 0 and less than or equal to 2 °.

12. An underscreen fingerprint identification device according to any one of claims 1-10 wherein the second reflecting means has a second angle of inclination with respect to the light-sensitive surface of the fingerprint sensor, the first reflecting means being parallel to the light-sensitive surface of the fingerprint sensor, wherein the second angle of inclination is greater than 0 and less than or equal to 2 °.

13. An underscreen fingerprint identification device according to any one of claims 1-10 wherein the first reflecting means and the second reflecting means are both obliquely disposed with respect to the light sensing surface of the fingerprint sensor and the angle of inclination of the first reflecting means with respect to the second reflecting means is greater than 0 and less than or equal to 4 °.

14. The device according to any one of claims 1 to 9, wherein the second reflecting means comprises a convex mirror for increasing the area of the fingerprint detection area of the liquid crystal display screen.

15. The underscreen fingerprint recognition device of claim 14, wherein the convex mirror comprises a substrate and a convex structure formed on the substrate, the convex structure surface being provided with a reflective coating.

16. An underscreen fingerprint identification device according to any one of claims 1-15 further comprising a light emitting unit for providing a probe light to said fingerprint sensor, wherein said probe light is used to illuminate a finger to form said fingerprint detection light.

17. The device of claim 16, wherein the light emitting unit and the fingerprint sensor are disposed on a same flexible circuit board and connected to an external circuit through the flexible circuit board.

18. The device according to claim 16 or 17, wherein a light guide column is further disposed around the light emitting unit, and the light guide column is configured to guide the probe light emitted from the light emitting unit to the liquid crystal display.

19. An underscreen fingerprint identification device according to any one of claims 1-18 wherein said underscreen fingerprint identification device comprises two or more light emitting units, and said two or more light emitting units are respectively disposed on both sides of said second reflection means, said two or more light emitting units being closer to said fingerprint detection area than said fingerprint sensor.

20. The device of any one of claims 1-19, wherein the fingerprint sensor and the reflective component are configured to be disposed above a backlight module of the liquid crystal display or to be located at a side of the backlight module.

21. The device according to any one of claims 1 to 20, wherein the second reflecting means extends at least partially below the display area of the liquid crystal panel, and the second reflecting means transmits the backlight emitted from the backlight module and reflects the fingerprint detection light.

22. The device for identifying the fingerprints of any one of claims 1 to 21, wherein the backlight module has a profile structure extending downward at a non-display area of the liquid crystal panel to form an avoiding space, and the fingerprint sensor and the reflection assembly are disposed in the avoiding space.

23. An electronic device, comprising a liquid crystal display panel and the underscreen fingerprint identification device according to any one of claims 1 to 22, wherein the liquid crystal display panel comprises a liquid crystal panel and a backlight module, and the underscreen fingerprint identification device is arranged below a non-display area of the liquid crystal panel and above the backlight module.

24. A fingerprint identification device, characterized in that, includes a fingerprint sensor, an optical lens and a reflection assembly, the reflection assembly includes a first reflection device and a second reflection device, the first reflection device faces to the photosensitive surface of the fingerprint sensor, the optical lens is disposed between the first reflection device and the second reflection device, wherein, the second reflection device is used for reflecting fingerprint detection light to the optical lens, the optical lens is used for focusing the fingerprint detection light to the first reflection device, the first reflection device is used for reflecting the fingerprint detection light from the optical lens to the fingerprint sensor, the fingerprint sensor is used for receiving the fingerprint detection light reflected by the first reflection device and detecting fingerprint information of finger according to the fingerprint detection light.

25. The fingerprint recognition device of claim 24, wherein the fingerprint detection light is a light signal formed and returned by reflection or scattering of a finger over a display area of the display screen.

26. The fingerprint recognition device of claim 24 or 25, wherein the first reflection device comprises a light reflection area, wherein the light reflection area is disposed above the fingerprint sensor and prevents a light signal generated by the fingerprint detection light reflected by the fingerprint sensor surface from entering the light reflection area again.

27. The fingerprint recognition device of claim 26, wherein the light-reflecting region of the first reflective device is parallel to and at most partially covers the light-sensitive surface of the fingerprint sensor.

28. The fingerprint identification device of claim 26 or 27, wherein the first reflective device further comprises a non-reflective region adjacent to the reflective region for receiving a light signal formed by reflection of the fingerprint detection light at the fingerprint sensor surface.

29. The fingerprint recognition device according to any one of claims 26-28, wherein the fingerprint sensor comprises a sensing array having a plurality of optical sensing units, and the fingerprint detection light detected by the optical sensing unit of the fingerprint sensor near the optical lens comprises a near-end light signal, wherein the light signal formed after the surface of the fingerprint sensor is partially reflected cannot enter the light reflection region of the first reflecting device.

30. The fingerprint recognition device of claim 29, wherein the fingerprint detection light detected by the optical sensing unit at the end of the fingerprint sensor away from the optical lens comprises a far-end light signal reflected from the edge of the light-reflecting region of the first reflecting device to the fingerprint sensor.

31. The fingerprint identification device of any one of claims 24-30, wherein at least one of the first reflective device and the second reflective device is disposed at an angle with respect to a light-sensitive surface of the fingerprint sensor.

32. The fingerprint identification device of any one of claims 24-31 wherein the first reflective device has a first tilt angle with respect to the photosensitive surface of the fingerprint sensor and the second reflective device is parallel to the photosensitive surface of the fingerprint sensor, wherein the first tilt angle is greater than 0 and less than or equal to 2 °.

33. The fingerprint identification device of any one of claims 24-31 wherein the second reflective device has a second angle of inclination with respect to the photosensitive surface of the fingerprint sensor, the first reflective device being parallel to the photosensitive surface of the fingerprint sensor, wherein the second angle of inclination is greater than 0 and less than or equal to 2 °.

34. The fingerprint identification device of any one of claims 24-31 wherein the first reflective means and the second reflective means are both tilted with respect to the light sensing surface of the fingerprint sensor, and wherein the tilt angle of the first reflective means with respect to the second reflective means is greater than 0 and less than or equal to 4 °.

35. The fingerprint identification device of any one of claims 24-30 wherein the second reflective means comprises a convex mirror comprising a convex structure, the convex structure surface being provided with a reflective coating.

36. The fingerprint recognition device according to any one of claims 24-35, further comprising a light emitting unit for providing a detection light to the fingerprint sensor, wherein the detection light is used to illuminate a finger to form the fingerprint detection light.

37. The fingerprint recognition device of claim 36, wherein the light emitting unit and the fingerprint sensor are disposed on the same flexible circuit board and connected to an external circuit through the flexible circuit board.

38. The fingerprint recognition device according to claim 36 or 37, wherein a light guide column is further disposed around the light emitting unit, and the light guide column is configured to guide the detection light emitted by the light emitting unit to the display screen, so as to form the fingerprint detection light by reflection or scattering of a finger above the fingerprint detection region of the display screen.

39. The fingerprint recognition device according to any one of claims 24-38, wherein the fingerprint recognition device comprises two or more light emitting units, and the two or more light emitting units are respectively disposed at two sides of the second reflection device, and the two or more light emitting units are located in front of the fingerprint sensor.

40. The fingerprint recognition device of any one of claims 24-39, wherein the optical lens comprises at least one lens and a micro aperture stop, wherein a center of the micro aperture stop is not aligned with an optical center of the at least one lens.

41. An off-screen fingerprint identification device comprising the fingerprint identification device of any one of claims 24 to 40, wherein the fingerprint identification device is configured to be disposed below a display screen, and a fingerprint detection area of the fingerprint identification device is located in a display area of the display screen.

42. The device of claim 41, wherein the display is a liquid crystal display comprising a liquid crystal panel and a backlight module, and wherein the fingerprint identification device is configured to be disposed below the non-display area of the liquid crystal panel and above the backlight module to detect fingerprint detection light formed by a finger above the display area of the liquid crystal panel and returning to the non-display area of the liquid crystal panel through the liquid crystal panel.