WO2020082375A1

WO2020082375A1 - Compound lens structure, fingerprint recognition apparatus, and electronic device

Info

Publication number: WO2020082375A1
Application number: PCT/CN2018/112222
Authority: WO
Inventors: 杜灿鸿
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-10-26
Filing date: 2018-10-26
Publication date: 2020-04-30
Also published as: CN109564623A

Abstract

A compound lens structure, a fingerprint recognition apparatus, and an electronic device. The fingerprint recognition apparatus comprises: a compound lens structure (300) that is arranged below a display screen (120) and comprises at least one lens element and a support (330), each lens element among the at least one lens element being provided with a curved surface at at least two positions, the curved surface at each position being used for forming at least one single lens, and the support (330) being used for supporting the at least one lens element; and a fingerprint recognition module (140) that comprises at least two sensing arrays, the at least two sensing arrays respectively being arranged below the at least two positions, the at least two sensing arrays respectively being used for detecting an optical signal passing through the lens formed on the at least two positions, and the optical signal being used for detecting fingerprint information in respect of a finger. The compound lens structure not only can effectively reduce optical parameter deviation among a plurality of lenses, but can also effectively reduce the size parameters of the compound lens, thereby satisfying the technical requirements in respect of dual sensing and even large-area fingerprint recognition.

Description

Compound lens structure, fingerprint identification device and electronic equipment

Technical field

The embodiments of the present application relate to the field of electronic technology, and more specifically, to a compound lens structure, a fingerprint recognition device, and an electronic device.

Background technique

With the rapid development of the mobile phone industry, fingerprint recognition technology has been paid more and more attention, and the practicality of the off-screen fingerprint recognition technology has become a public demand.

Under-screen fingerprint recognition technology is to collect the reflected light formed by the light emitted from the light source by the fingerprint sensor through the fingerprint sensor, and the reflected light carries the fingerprint information of the finger, thereby realizing the under-screen fingerprint recognition. When performing fingerprint recognition, the optical signal reflected by the finger needs to be transmitted to the fingerprint recognition module provided under the display screen through an optical path modulator such as a focusing lens.

The large-area under-screen fingerprint recognition technology collects reflected light carrying fingerprint information through multiple fingerprint sensors. Therefore, multiple focusing lenses corresponding to the multiple fingerprint sensors need to be equipped. In order to achieve a consistent imaging effect, the optical parameters of the focusing lenses corresponding to different fingerprint sensors need to be completely consistent. For example, image distance parameters and object distance parameters.

However, due to the limitation of the installation process, when each of the plurality of focusing lenses is installed separately, there must be a certain degree of deviation in the optical parameters of different focusing lenses, so that the multiple fingerprint sensors cannot achieve the expected imaging effect . In addition, when the plurality of focusing lenses are separately installed according to the existing installation method of one focusing lens, the distance between the plurality of lenses is too large, thereby failing to meet the technical requirements for large-area fingerprint recognition.

Summary of the invention

Provided is a compound lens structure, a fingerprint recognition device, and an electronic device. The compound lens structure can not only effectively reduce the deviation of the optical parameters of multiple lenses, but also effectively reduce the size parameters of the compound lens, thereby satisfying dual induction or even Technical requirements for large area fingerprint identification.

In a first aspect, a fingerprint identification device is provided, including:

A compound lens structure for setting under the display screen, including at least one lens and a bracket; each of the at least one lens is provided with a curved surface at at least two positions, and the curved surface at each position is used to form At least one single lens; the bracket is used to support the at least one lens.

A fingerprint recognition module, the fingerprint recognition module includes at least two sensing arrays, the at least two sensing arrays are respectively disposed below the at least two positions, and the at least two sensing arrays are respectively used to detect The optical signals of the lenses formed in at least two positions, the optical signals are used to detect fingerprint information of a finger.

In some possible implementations, the two sensing arrays respectively correspond to the two sensing areas in the display area of the display screen.

In some possible implementations, the fingerprint recognition module includes two fingerprint sensors, where each fingerprint sensor is provided with a sensing array.

In some possible implementation manners, the fingerprint recognition module includes a fingerprint sensor, wherein the one fingerprint sensor is provided with two sensing arrays, and there is a gap between the two sensing arrays.

In some possible implementation manners, the shape of the curved surface of each lens at the at least two positions is the same.

In some possible implementations, the at least one lens is a plurality of lenses, and the curved surface at each position is used to form a compound lens.

In some possible implementations, the optical imaging parameters of the compound lens in the at least two positions are the same.

In some possible implementation manners, at each position, the projection of the optical center of the curved surface of each lens on a first plane overlaps, and the first plane and the first of the plurality of lenses The upper or lower surface plane of the lens is parallel.

In some possible implementations, the first lens is any lens in the plurality of lenses.

In some possible implementation manners, the compound lens structure further includes:

At least one shading sheet, the at least one shading sheet and the at least one lens are alternately arranged;

Each of the at least one shading sheet is provided with at least two openings corresponding to the at least two positions.

In some possible implementations, the number of the at least one lens is greater than or equal to the number of the at least one light-shielding sheet.

In some possible implementation manners, the plurality of lenses are two lenses, and a light shielding sheet is disposed between the two lenses.

In some possible implementations, the bracket is provided with an opening, and the at least one lens is disposed in the one opening.

In some possible implementations, the thickness of the bracket in the peripheral area of the opening of the one opening is greater than the thickness of the bracket in the area away from the opening.

In some possible implementation manners, a convex structure is formed on the upper surface of the bracket extending upward from the peripheral area of the opening of the one opening.

A fixing member for fixing the at least one lens in the one opening.

In some possible implementations, the fixing member is located in a peripheral area of the opening of the one opening.

In a second aspect, a compound lens structure is provided, including:

At least one lens and bracket;

Each of the at least one lens is provided with a curved surface at at least two positions, and the curved surface at each position is used to form at least one single lens;

The bracket is used to support the at least one lens.

A fixing member for fixing the at least one lens in the one opening.

In a third aspect, an electronic device is provided, including:

The fingerprint identification device described in the display screen, the first aspect, and any possible implementation manner of the first aspect; wherein the fingerprint identification device is provided below the display screen.

In some possible implementation manners, the electronic device further includes: a filter, disposed between the display screen and the fingerprint recognition module.

In some possible implementations, the display screen is a liquid crystal display (LCD).

In some possible implementations, the display screen is an organic light-emitting diode OLED display screen, and the light-emitting layer of the display screen includes a plurality of organic light-emitting diode light sources, wherein the fingerprint recognition device uses at least part of the organic light-emitting diode light sources as fingerprint Identified excitation light source.

Based on the above technical solution, the compound lens structure of the embodiment of the present application may include at least one lens. By providing curved surfaces at at least two positions of the at least one lens, multiple single lenses can be formed, and the multiple single lenses can be formed. The body lens is fixedly mounted on the bracket as a whole, which can not only effectively reduce the deviation of the optical parameters of the plurality of single lenses, but also effectively reduce the size parameters of the composite lens, thereby satisfying dual induction or even large area fingerprints Identify the technical requirements.

BRIEF DESCRIPTION

FIG. 1 is a schematic plan view of an electronic device to which this application can be applied.

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

3 is a schematic side cross-sectional view of an electronic device according to an embodiment of the present application.

4 is a schematic side cross-sectional view of a compound lens structure according to an embodiment of the present application.

5 is a schematic side cross-sectional view of a compound lens structure according to another embodiment of the present application.

6 is a schematic side cross-sectional view of a deformed structure of the compound lens structure described in FIG. 5.

detailed description

The technical solutions in this application will be described below with reference to the drawings.

It should be understood that the embodiments of the present application may be applied to fingerprint systems, including but not limited to optical, ultrasonic or other fingerprint recognition systems and medical diagnostic products based on optical, ultrasonic or other fingerprint imaging, and the embodiments of the present application only take optical fingerprint systems as examples The description will be made, but it should not constitute any limitation to the embodiments of the present application. The embodiments of the present application are also applicable to other systems that use optical, ultrasonic, or other imaging technologies.

It should also be understood that in addition to fingerprint recognition, the technical solutions of the embodiments of the present application may also perform other biometric recognition, such as palmprint recognition, iris recognition, and face recognition, etc., which are not limited in the embodiments of the present application.

As electronic devices enter the era of full screens, the fingerprint collection area on the front of electronic devices is squeezed by full screens. Therefore, under-display (Under-display or Under-screen) fingerprint recognition technology has attracted more and more attention. The off-screen fingerprint recognition technology refers to installing the fingerprint recognition module (such as the fingerprint recognition module) under the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen, without the need for other than the display area on the front of the electronic device Area setting fingerprint collection area.

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

It should be understood that the technical solutions of the embodiments of the present application may be applied to various electronic devices, such as smart phones, notebook computers, tablet computers, game devices, and other portable or mobile computing devices, as well as electronic databases, automobiles, and bank automated teller machines (Automated Teller Machine) , ATM) and other electronic devices, but this embodiment of the present application is not limited thereto.

FIG. 1 shows a schematic front view of an electronic device 100 to which a fingerprint identification device can be applied, and FIG. 2 is a schematic diagram of a partial cross-sectional structure of the electronic device 100 shown in FIG.

As shown in FIG. 1, the electronic device 100 may include a display screen 120 and a fingerprint recognition module 140, wherein the display screen 120 has a display area 102, and the fingerprint recognition module 140 is disposed below the display screen 120.

The display screen 120 may be a self-luminous display screen, which uses a display unit with self-luminescence as display pixels. For example, the display screen 120 may be an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro-LED display screen. In other alternative embodiments, the display screen 120 may also be a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display screen, which is not limited in the embodiments of the present application.

On the other hand, the display screen 120 may be, for example, a touch display screen, which can not only display images, but also detect a user's touch or press operation, thereby providing a human-computer interaction interface for the user. For example, in an embodiment, the electronic device 100 may include a touch sensor, and the touch sensor may specifically be a touch panel (Touch Panel, TP), which may be disposed on the surface of the display screen 120, or may be partly It is integrated or integrated into the display screen 120 to form the touch display screen.

The fingerprint recognition module 140 may be specifically an optical fingerprint recognition module, which is mainly used to collect user fingerprint information (such as fingerprint image information). In the embodiment of the present application, the fingerprint recognition module 140 may be disposed at least in a partial area below the display screen 120, so that the fingerprint collection area (or sensing area) 130 of the fingerprint recognition module 140 is at least partially located The display area 102 of the display screen 120.

The area of the fingerprint collection area 130 may be different from the area of the fingerprint recognition module 140. For example, the optical path design such as lens imaging, reflective folding optical path design, or other optical convergence or reflection light path design may make the fingerprint identification module The area of the fingerprint collection area 130 of the group 140 is larger than the area of the fingerprint identification module 140. In other alternative implementations, if the light path is guided by, for example, light collimation, the fingerprint collection area 130 of the fingerprint identification module 140 may also be designed to be consistent with the area of the fingerprint identification module 140.

As an embodiment, the fingerprint recognition module 140 may specifically include a fingerprint sensor (also called a sensor chip). The one fingerprint sensor is disposed below the display screen 120. The one fingerprint sensor may specifically include two optical sensing arrays, and each optical sensing array may include multiple optical sensing units, and each optical sensing array corresponds to a sensing area in the display screen 120. In other words, the one fingerprint sensor may be provided with two optical sensing arrays for optical sensing, and there may be a gap between the two optical sensing arrays. That is to say, the one fingerprint sensor corresponds to two sensing areas, and there may be a gap between the two sensing areas, or some areas may overlap.

As another embodiment, the fingerprint recognition module 140 may specifically include two fingerprint sensors, and the two optical fingerprint sensors may be arranged side by side under the display screen 120. Each fingerprint sensor may specifically include an optical sensing array, and the optical sensing array may include a plurality of optical sensing units, and the optical sensing array may correspond to a sensing area in the display screen 120. In other words, each fingerprint sensor corresponds to a sensing area, that is, the sensing areas of the two optical fingerprint sensors together constitute the fingerprint collection area 130 of the fingerprint recognition module 140.

The optical sensing array may specifically be a photodetector array (or called photodetector array), which includes a plurality of photodetectors distributed in an array, and the photodetectors may be used as described above Optical sensing unit.

As shown in FIG. 1, the fingerprint collection area 130 of the fingerprint identification module 140 may include two sub-areas, and there is an overlapping area between the two sub-areas. Each sub-region corresponds to the sensing region of one of the optical fingerprint sensor or the optical sensing array. In other alternative embodiments, there may also be no overlapping region between the two sub-regions, which is not specifically limited in this embodiment of the present application. The fingerprint collection area 130 is located in the display area 102 of the display screen 120. Since two optical fingerprint sensors are arranged side by side, the fingerprint collection area 130 of the fingerprint identification module 140 can be expanded to the display area The main area of the lower half of 102, which is extended to the area where fingers are used to pressing, realizes a blind-press fingerprint input operation.

In other alternative embodiments, when the number of the optical fingerprint sensors is sufficient, the fingerprint collection area 130 may also be extended to half a display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

When the user needs to unlock the electronic device 100 or verify other fingerprints, he only needs to press his finger on the fingerprint collection area 130 located on the display screen 120 to realize the fingerprint input operation. Since fingerprint collection and detection can be implemented inside the display area 102 of the display screen 120, the electronic device 100 adopting the above structure does not require a special reserved space on the front of it to set fingerprint buttons (such as the Home button), so a full screen solution can be adopted. Therefore, the display area 102 of the display screen 120 can be substantially extended to the entire front surface of the electronic device 100.

In a specific embodiment, the two fingerprint sensors of the fingerprint recognition module 140 may be separately packaged sensor chips, or may be fabricated as multiple chips (Die) and then packaged in the same chip package, and It can be produced in different areas of the same chip (Die) through a semiconductor process.

On the other hand, in addition to the optical sensor array as described above, the fingerprint sensor may also be a reading circuit and / or other auxiliary circuits electrically connected to the sensor array. As an optional implementation, as shown in FIG. 2, an optical path modulator may also be provided above the fingerprint sensor. Taking the collimator as an example, it can be attached to the sensor array of the fingerprint sensor as an independent optical component, or it can be integrated inside the chip of the fingerprint sensor through a semiconductor process, thereby achieving ultra-thin fingerprint recognition Module 140.

Specifically, the optical path modulator may be an optical collimator using a through-hole array with a high aspect ratio, which is mainly used to collimate, modulate and image fingerprint detection light propagating downward, so as to realize The reflected light reflected back is guided to the sensing array for optical detection to obtain fingerprint image information.

Optionally, corresponding to the two fingerprint sensors of the fingerprint identification module 140, there may be two optical path modulators, and each optical path modulator corresponds to an optical fingerprint sensor respectively, and are respectively arranged and matched at their corresponding Above the fingerprint sensor. Alternatively, the two fingerprint sensors may also share an integral optical path modulator, that is, the optical path modulator has a sufficiently large area to cover the sensing array of the two fingerprint sensors.

In addition, between the optical path modulator and the fingerprint sensor or between the display screen 120 and the optical path modulator, other optical elements, such as a filter or other optical film, may also be provided , Which is mainly used to isolate the influence of external interference light on optical fingerprint detection. Wherein, the filter can be used to filter out the ambient light penetrating the finger and entering the image recognition sensor 130 through the display screen 120, similar to the optical path modulator, the filter can be Each fingerprint sensor is separately configured to filter out interference light, or a large-area filter may be used to cover the two fingerprint sensors at the same time.

Alternatively, the optical path modulator may also be replaced by an optical lens (Lens), and a small hole may be formed above the optical lens through a light-shielding material to cooperate with the optical lens to collect fingerprint detection light to a fingerprint sensor below to realize fingerprint Imaging. Similarly, each fingerprint sensor can be configured with an optical lens to perform fingerprint imaging, or the two fingerprint sensors can also use the same optical lens to achieve light convergence and fingerprint imaging. In other alternative embodiments, each fingerprint sensor may even have two sensing arrays (Dual Array), and two optical lenses are configured for the two sensing arrays simultaneously for optical imaging, thereby reducing the imaging distance and enhancing Imaging effect.

In the embodiment of the present application, the display screen 120 uses an OLED display screen as an example. The light-emitting layer of the display screen 120 has an array of OLED display units arranged in an array. The fingerprint recognition module 140 can use the OLED display. The OLED display unit (ie, OLED light source) of the screen 120 located in the fingerprint collection area 130 serves as an excitation light source for fingerprint detection and identification.

Of course, it should be understood that in other alternative implementations, the fingerprint identification module 140 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the off-screen fingerprint recognition device can be applied not only to self-luminous display screens such as OLED display screens, but also to non-self-luminous display screens such as liquid crystal display screens or other passive light-emitting display screens.

Taking an LCD screen with a backlight module and a liquid crystal panel as an example, in order to support the off-screen fingerprint detection of the LCD screen, the pair may also include an excitation light source for optical fingerprint detection, and the excitation light source may specifically be an infrared light source Or a non-visible light source with a specific wavelength. Taking an infrared light source as an example, it may be disposed under the backlight module of the liquid crystal display screen or the edge area below the protective cover of the electronic device 100, and the fingerprint recognition module 140 is disposed at the backlight Under the module, and the backlight module through openings or other optical design of the film layers such as the diffusion sheet, the brightness enhancement sheet, the reflection sheet, etc. to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the fingerprint recognition module Group 140 optical fingerprint sensors.

When a finger touches, presses, or approaches (for ease of description, collectively referred to as pressing in this application) in the fingerprint collection area 130, the display unit of the fingerprint collection area 130 or the additional configuration of the fingerprint detection excitation light source emits light at The finger reflects and forms reflected light, wherein the reflected light may carry fingerprint information of the user's finger. For example, after the light is reflected by the fingerprint on the surface of the user's finger, the reflected light of the ridge and valley of the finger fingerprint is different, so the reflected light carries the fingerprint information of the user. The reflected light returns to the display screen 120 and is received by the photodetector array of the fingerprint identification module 140 below it and converted into a corresponding electrical signal, that is, a fingerprint detection signal. The electronic device 100 can obtain the fingerprint information of the user based on the fingerprint detection signal, and can further perform fingerprint matching verification to complete the identity verification of the current user in order to confirm whether it has the authority to perform the corresponding operating.

It should be understood that, in a specific implementation, the electronic device 100 further includes a protective cover 110, and the cover 110 may be specifically a transparent cover, such as a glass cover or a sapphire cover, which is located on the display screen 120 And cover the front of the electronic device 100, and a protective layer may be provided on the surface of the protective cover 110. Therefore, in the embodiment of the present application, the so-called finger pressing on the display screen 120 may actually mean that the finger presses the cover plate 110 above the display screen 120 or covers the surface of the protective layer of the cover plate 110.

On the other hand, a circuit board 150 such as a flexible printed circuit (FPC) may also be provided under the fingerprint recognition module 140, and the fingerprint recognition module 140 may be soldered to the circuit through a pad Board 150, and realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 100 through the circuit board 150. For example, the fingerprint recognition module 140 may receive the control signal of the processing unit of the electronic device 100 through the circuit board 150, and may also output the fingerprint detection signal to the electronic device through the circuit board 150 100 processing unit or control unit.

It should be noted that when collecting the reflected light carrying fingerprint information through multiple fingerprint sensors, multiple focusing lenses corresponding to the multiple fingerprint sensors need to be equipped. In order to achieve a consistent imaging effect, the optical focus lens corresponding to different fingerprint sensors The parameters need to be exactly the same. For example, image distance parameters and object distance parameters.

As shown in FIG. 3, the electronic device 200 may include:

The display screen 210, two focusing lenses (ie, first focusing lens 231 and second focusing lens 232), one filter 240, and two fingerprint sensors (ie, first fingerprint sensor 251 and second fingerprint sensor 252).

It should be understood that the display screen 210 shown in FIG. 3 may be the display screen 120 shown in FIGS. 1 and 2, and the first fingerprint sensor 251 and the second fingerprint sensor 252 shown in FIG. 3 may be shown in FIG. 1 and FIG. 2 In the fingerprint identification module 140 of FIG. 3, the filter 240 shown in FIG. 3 may be the filter referred to in the description of FIG. 1 and FIG. To avoid repetition, the specific structures and types of the display screen 210, the filter 240, the first fingerprint sensor 251, and the second fingerprint sensor 252 are not repeated here.

In the embodiment of the present application, the first sensing area 221 corresponding to the first fingerprint sensor 251 and the second sensing area 222 corresponding to the second fingerprint sensor 252 may constitute the electronic device 200 for fingerprint registration or fingerprint recognition Sensing area.

Specifically, the electronic device 200 can determine whether the fingerprint information in each sensing area can be used to generate one for fingerprint registration or fingerprint recognition through the overlapping of the first sensing area 221 and the second sensing area 222 Image, or it can be determined whether the fingerprint information in the first sensing area 221 and the fingerprint information in the second sensing area 222 are spliced into an image for fingerprint registration or fingerprint recognition, and then based on dual sensing The fingerprint information in the area is used for fingerprint registration or fingerprint identification.

In addition, when the electronic device 200 recognizes the user's fingerprint by stitching fingerprint images, the image distance of the first focusing lens 231 and the image distance of the second focusing lens 232 can be effectively reduced, which can effectively reduce the The thickness of the electronic device 200.

In addition, when the fingerprint information in each sensing area is used to generate a fingerprint image, the information amount of the fingerprint information can be effectively increased, and thus the fingerprint recognition performance of the electronic device 200 can be effectively increased.

As shown in FIG. 3, the object distance of the first focusing lens 231 (P as shown) is the vertical distance between the lower surface of the display screen and the optical center of the first focusing lens 231, so The image distance (Q as shown) of the first focusing lens 231 is the vertical distance between the optical center of the first focusing lens 231 and the upper surface of the first fingerprint sensor 251. Similarly, the object distance of the second focusing lens 232 is the vertical distance between the lower surface of the display screen and the optical center of the second focusing lens 232, and the image distance of the second focusing lens 232 is The vertical distance between the optical center of the second focusing lens 232 and the upper surface of the second fingerprint sensor 252. Optionally, the object distance of the first focusing lens 231 is equal to the object distance of the second focusing lens 231, and the image distance of the first focusing lens is equal to the image distance of the second focusing lens.

Optionally, the optical parameters of the first focusing lens 231 are equal to the optical parameters of the second focusing lens 232.

For example, the object distance of the first focusing lens 231 is equal to the object distance of the second focusing lens 232, and the image distance of the first focusing lens is equal to the image distance of the second focusing lens. For another example, the viewable angle of the first focusing lens 231 (as shown in a) can also be equal to the viewable angle of the second focusing lens 232 (as shown in b).

Based on the above technical solution, the optical parameters of the first focusing lens 231 and the optical parameters of the second focusing lens 232 are completely the same, which can make the imaging effect of the first fingerprint sensor 251 and that of the second fingerprint sensor 252 The imaging effects are the same or similar. Therefore, when the fingerprint image acquired by the first fingerprint sensor 251 and the fingerprint image acquired by the second fingerprint sensor 252 are stitched, the difficulty of stitching the fingerprint images can be effectively reduced.

Optionally, the optical parameters of the first focusing lens 231 may not be equal to the optical parameters of the second focusing lens 232.

For example, when the viewable angle of the first focusing lens 231 (as shown in a) is equal to the viewable angle of the second focusing lens 232 (as shown in b), the object of the first focusing lens 231 The distance is greater than the object distance of the second focusing lens 232.

In the embodiment of the present application, by distinguishing the optical parameters of the first focusing lens 231 and the second focusing lens 232, the fingerprint information acquired by the first fingerprint sensor 251 and the second fingerprint sensor can be made The fingerprint information acquired by 252 can be effectively complemented, thereby improving the fingerprint recognition performance of the electronic device 200.

As shown in FIG. 3, the first sensing area 221 and the second sensing area 222 partially overlap. Therefore, the electronic device 200 can obtain the second fingerprint and the fingerprint image acquired by the first fingerprint sensor 251 The overlapping part of the fingerprint image acquired by the sensor 252 performs the stitching of the fingerprint image.

Optionally, the first sensing area 221 and the second sensing area 222 may partially overlap in the first direction. The first direction may be the direction where the line between the first center and the second center in the plane where the display screen 210 is located, where the first center may be the center of the first sensing area 221, The second center may be the center of the second sensing area 22. Optionally, the first direction is parallel to or intersects with the short side of the upper surface of the display screen 210. Optionally, the first direction is parallel to or intersects with the long side of the upper surface of the display screen 210.

The width of the overlapping area 223 of the first sensing area 221 and the second sensing area 222 in the first direction is smaller than the first threshold and larger than the second threshold. Optionally, the width of the first sensing area 221 and the width of the second sensing area 222 are equal. Optionally, the widths of the first sensing area 221, the second sensing area 222, and the overlapping area 223 in the second direction perpendicular to the first direction are equal.

It should be understood that FIG. 3 is only an example of an embodiment of the present application, and should not be understood as a limitation to the embodiment of the present application. For example, the number, size, and arrangement of the fingerprint sensor and / or focus lens shown in FIG. 3 are only examples, and can be adjusted according to actual needs, which is not particularly limited in the embodiments of the present application. For example, in other alternative embodiments, the first fingerprint sensor 251 and the second fingerprint sensor 252 may be replaced with two optical sensing arrays of one fingerprint sensor. This embodiment of the present application does not specifically limit this.

However, due to the limitation of the installation process, there must be a certain degree of deviation between the optical parameters of the first focusing lens 231 and the second focusing lens 232, so that the first fingerprint sensor 251 and the second fingerprint The sensor 252 does not achieve the expected imaging effect.

The embodiments of the present application provide a compound lens structure, which can effectively reduce the deviation of the optical parameters of the multiple lenses.

As shown in FIG. 4, the compound lens structure 300 may include:

The first compound lens 310 and the second compound lens 320 are both a three-piece structure. Specifically, the first compound lens 310 includes a first lens 311, a first shading sheet 312, and a second lens 313; the second compound lens 320 includes a third lens 321, a second shading sheet 322, and a fourth lens 323 . An opening is provided at a specific position of the first light-shielding sheet 312 and the second light-shielding sheet 322, and the opening is used to shield stray light.

Taking the first compound lens 310 as an example, the first lens 311 is used to converge the received optical signal into the opening of the first light-shielding sheet 312, and the second lens 313 is used to pass the The opening of the first light-shielding sheet 312 receives the optical signal transmitted by the first lens 311 and outputs the received optical signal.

As shown in FIG. 4, the compound lens structure 300 may further include:

A bracket 330 may be provided with two openings, wherein the first compound lens 310 is installed in one opening, and the second compound lens 320 is installed in another opening.

As shown in FIG. 4, the compound lens structure 300 may further include:

A first connecting piece 340 and a second connecting piece 350, wherein the first connecting piece 340 is used to fix the first compound lens in an opening of the bracket 330, and the second connecting piece 350 is used to The second compound lens 320 is fixed in another opening of the bracket 330.

It should be noted that the large-area fingerprint recognition technology requires multiple fingerprint sensors to be installed at close range, and corresponding lenses or compound lenses are respectively configured for the multiple fingerprint sensors. However, since the external dimensions of the compound lens will be relatively large, when the distance between the first compound lens 310 and the second compound lens 320 needs to be set closer, if the installation scheme shown in FIG. 4 is adopted, the first A connecting member 340 and the second connecting member 350 may have dimensional interference. Therefore, the installation scheme of FIG. 4 cannot meet the requirements of large-area fingerprint recognition technology.

An embodiment of the present application provides another compound lens structure. The compound lens structure may include: at least one lens and a bracket.

Each of the at least one lens is provided with a curved surface at at least two positions, and the curved surface at each position is used to form at least one single lens.

The bracket is used to support the at least one lens.

Based on the above technical solution, the compound lens structure of the embodiment of the present application can form a plurality of single lens by setting curved surfaces at at least two positions of the at least one lens, and fix the multiple single lenses as a whole Mounting on the bracket can not only effectively reduce the deviation of the optical parameters of the multiple single lenses, but also effectively reduce the size parameters of the compound lens, thereby meeting the technical requirements of dual-sensing and even large-area fingerprint recognition.

Optionally, in some embodiments of the present application, the at least one lens is a plurality of lenses, and the curved surface at each position is used to form a compound lens. Optionally, the optical imaging parameters of the compound lens in the at least two positions are the same.

Optionally, in some embodiments of the present application, at each position, the projection of the optical center of the curved surface of each lens on the first plane overlaps, and the first plane and the multiple The upper surface plane or the lower surface plane of the first lens in the lens is parallel. Optionally, the first lens is any lens in the plurality of lenses.

Optionally, in some embodiments of the present application, the compound lens structure further includes at least one shading sheet, the at least one shading sheet and the at least one lens are alternately arranged; each of the at least one shading sheet The shading sheet is provided with at least two openings corresponding to the at least two positions. Optionally, the number of the at least one lens is greater than or equal to the number of the at least one light-shielding sheet.

Optionally, the bracket is provided with an opening, and the at least one lens is disposed in the one opening. Optionally, the thickness of the bracket in the peripheral area of the opening of the one opening is greater than the thickness of the bracket in the area away from the opening. Optionally, a convex structure is formed on the upper surface of the bracket extending upward from the peripheral area of the opening of the one opening.

Optionally, in some embodiments of the present application, the compound lens structure further includes a fixing member, and the fixing member is used to fix the at least one lens in the one opening. Optionally, the fixing member is located in a peripheral area of the opening of the one opening.

For ease of understanding, the following uses the at least one lens as two lenses as an example to describe in detail the technical solutions of the embodiments of the present application.

5 is a schematic side cross-sectional view of a compound lens structure according to an embodiment of the present application.

As shown in FIG. 5, the compound lens structure 400 may include:

The first lens 411 and the second lens 413 and the bracket 440. Wherein, the lower surface of the first lens 411 is provided with a curved surface at the first position 420 for forming a single lens. The lower surface of the first lens 411 is provided with another curved surface at the second position 430 for forming another single lens.

Similarly, the lower surface of the second lens 413 is provided with a curved surface at the first position 420 to form a single lens, and the lower surface of the second lens 413 is provided with another surface at the second position 430 One curved surface is used to form another single lens.

In summary, the compound lens structure 400 of the embodiment of the present application may include one compound lens at the first position 420 and another compound lens at the second position 430. It can be found that by fixing the compound lens at the first position 420 and the compound lens at the second position 430 as a whole in the opening of the bracket 440, not only can these two compound lenses be effectively reduced The deviation of the optical parameters can also effectively reduce the size parameters of the two composite lenses, thereby meeting the technical requirements of dual-sensing and even large-area fingerprint recognition.

Optionally, as shown in FIG. 5, the lower surface of the first lens 411 and the lower surface of the second lens 413 at the first position 420 have the same curved surface shape, and the first lens 411 The lower surface of the lens has the same shape as the curved surface at the second position 430 on the lower surface of the second lens 413. That is to say, the embodiments of the present application can ensure that the optical parameters of the compound lens located at the first position 420 and the compound lens located at the second position 430 are the same or the most similar.

Optionally, as shown in FIG. 5, the optical center of the single lens at the first position 420 of the first lens 411 and the single lens at the first position 420 of the second lens 413 The projection of the optical center of the first lens on the first plane overlaps, the optical center of the single lens of the first lens 411 at the second position 430 and the single lens of the second lens 413 at the second position 430 The projection of the optical center of the lens on the first plane overlaps.

The first plane may be a plane parallel to the upper surface of the first lens 411, or may be a plane parallel to the upper surface of the second lens 413, and the first plane may be the first lens The upper surface of 411 may also be the upper surface of the second lens 413. This embodiment of the present application does not specifically limit this.

Optionally, as shown in FIG. 5, the compound lens structure 400 may further include:

A light-shielding sheet 412, the light-shielding sheet 412 is disposed between the first lens 411 and the second lens 413; an opening is provided at the first position 420 of the light-shielding sheet 412, Another opening is provided at the second position 430 of 412.

In the fingerprint identification process, the single lens at the first position 420 of the first lens 411 is used to converge the received optical signal to the opening of the shading sheet 412 at the first position 420 Inside, the single lens at the second position 430 of the first lens 411 is used to converge the received optical signal into the opening of the shading sheet 412 at the second position 430. Similarly, the single lens of the second lens 413 receives the optical signal in the corresponding opening.

Optionally, a fingerprint sensor may be provided under the second lens 413 at the first position 420 of the single lens, and the second lens 413 at the second position 430 of the single lens There can be another fingerprint sensor below.

Optionally, as shown in FIG. 5, the bracket 440 may be provided with an opening, and the structure formed by the first lens 411, the light shielding sheet 412 and the second lens 413 is provided at the one opening Inside. For example, the structure formed by the first lens 411, the light-shielding sheet 412, and the second lens 413 may be fixedly connected to the inner wall of the one opening.

The fixing member 450 is used to fix the structure formed by the first lens 411, the light shielding sheet 412 and the second lens 413 in the one opening. The fixing member is located in a peripheral area of the opening of the one opening. For example, the inner surface of the fixing member 450 is fixedly connected to the outer surface of the structure formed by the first lens 411, the light shielding sheet 412, and the second lens 413, and the lower surface of the fixing member 450 is The peripheral area of the opening of the opening is fixedly connected.

It should be understood that FIG. 5 is only an example of an embodiment of the present application, and should not be understood as a limitation of the embodiment of the present application. For example, in other alternative embodiments, the thickness of the bracket 440 in the peripheral area of the opening of the one opening is greater than the thickness of the bracket 440 in the area away from the opening to ensure the bracket 440 The structure formed with the first lens 411, the light-shielding sheet 412, and the second lens 413 has a sufficient contact area. For example, as shown in FIG. 6, the compound lens structure 400 may include a bracket 450, and the upper surface of the bracket 450 extends upward from a peripheral area of the opening of the one opening to form a convex structure.

An embodiment of the present application also provides a fingerprint recognition device, which may include the compound lens structure and a fingerprint recognition module mentioned above, the fingerprint recognition module includes at least two sensor arrays, and the at least two A sensing array is respectively disposed below the at least two positions, and the at least two sensing arrays are respectively used to detect optical signals passing through the lenses formed at the at least two positions, and the optical signals are used to detect the Fingerprint information.

Optionally, the two sensing arrays respectively correspond to two sensing areas in the display area of the display screen. For example, the fingerprint identification module includes two fingerprint sensors, where each fingerprint sensor is provided with a sensing array. For another example, the fingerprint identification module includes a fingerprint sensor, wherein the one fingerprint sensor is provided with two sensing arrays, and there is a gap between the two sensing arrays.

An embodiment of the present application also provides an electronic device. The electronic device may include:

A display screen, the fingerprint identification device described above; wherein the fingerprint identification device is provided below the display screen.

The electronic device may be any electronic device with a display screen, which uses the technical solution of the embodiments of the present application to realize off-screen fingerprint recognition.

The display screen may use the display screen described above, such as an LCD display screen or an OLED display screen.

When the display screen is an organic light emitting diode display screen, the light emitting layer of the display screen includes a plurality of organic light emitting diode light sources, wherein the fingerprint identification device uses at least part of the organic light emitting diode light source as an excitation light source for fingerprint identification.

Optionally, in some embodiments of the present application, the electronic device further includes: a filter, disposed between the display screen and the fingerprint recognition module. For example, the filter is provided in the fingerprint recognition device, or the filter is provided between the display screen and the fingerprint recognition module included in the fingerprint recognition device.

The filter may use the filter described above.

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

It should be noted that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application.

For example, the singular forms "a", "said", "above", and "the" used in the embodiments of the present application and the appended claims are also intended to include most forms unless the context clearly indicates other meaning.

Those skilled in the art may realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of the present application.

If implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the present application may essentially be a part that contributes to the existing technology or a part of the technical solution may be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. The foregoing storage media include various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working processes of the devices, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, which are not repeated here.

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

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

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

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

The above content is only a specific implementation manner of the embodiments of the present application, but the scope of protection of the embodiments of the present application is not limited to this, and any person skilled in the art can easily think of within the technical scope disclosed in the embodiments of the present application Changes or replacements should be covered by the protection 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

A fingerprint identification device, characterized in that it includes:

A compound lens structure for setting under the display screen, including at least one lens and a bracket; each of the at least one lens is provided with a curved surface at at least two positions, and the curved surface at each position is used to form At least one single lens; the bracket is used to support the at least one lens.

A fingerprint recognition module, the fingerprint recognition module includes at least two sensing arrays, the at least two sensing arrays are respectively disposed below the at least two positions, and the at least two sensing arrays are respectively used to detect The optical signals of the lenses formed in at least two positions, the optical signals are used to detect fingerprint information of a finger.
The fingerprint identification device according to claim 1, wherein the two sensing arrays respectively correspond to two sensing areas in the display area of the display screen.
The fingerprint recognition device according to claim 1 or 2, wherein the fingerprint recognition module includes two fingerprint sensors, wherein each fingerprint sensor is provided with a sensing array.
The fingerprint recognition device according to claim 1 or 2, wherein the fingerprint recognition module includes a fingerprint sensor, wherein the one fingerprint sensor is provided with two sensing arrays, and there is a gap between the two sensing arrays interval.
The fingerprint identification device according to any one of claims 1 to 4, wherein the shape of the curved surface of each lens at the at least two positions is the same.
The fingerprint identification device according to any one of claims 1 to 5, wherein the at least one lens is a plurality of lenses, and the curved surface at each position is used to form a compound lens.
The fingerprint identification device according to claim 6, wherein the optical imaging parameters of the compound lens in the at least two positions are the same.
The fingerprint identification device according to claim 6, wherein at each position, the projection of the optical center of the curved surface of each lens on the first plane overlaps, and the first plane and the The upper surface plane or the lower surface plane of the first lens in the plurality of lenses is parallel.
The fingerprint identification device according to claim 8, wherein the first lens is any one of the plurality of lenses.
The fingerprint identification device according to any one of claims 1 to 9, wherein the compound lens structure further includes:

At least one shading sheet, the at least one shading sheet and the at least one lens are alternately arranged;

Each of the at least one shading sheet is provided with at least two openings corresponding to the at least two positions.
The fingerprint identification device according to claim 10, wherein the number of the at least one lens is greater than or equal to the number of the at least one shading sheet.
The fingerprint identification device according to claim 10, wherein the plurality of lenses are two lenses, and a light shielding sheet is provided between the two lenses.
The fingerprint identification device according to any one of claims 1 to 12, wherein the bracket is provided with an opening, and the at least one lens is provided in the one opening.
The fingerprint identification device according to claim 13, wherein the thickness of the bracket in the peripheral area of the opening of the one opening is greater than the thickness of the bracket in the area away from the opening.
The fingerprint identification device according to claim 13, wherein the upper surface of the bracket is formed with a convex structure extending upward in the peripheral area of the opening of the one opening.
The fingerprint identification device according to claim 13, wherein the compound lens structure further comprises:

A fixing member for fixing the at least one lens in the one opening.
The fingerprint identification device according to claim 16, wherein the fixing member is located in a peripheral area of the opening of the one opening.
A compound lens structure is characterized by comprising:

At least one lens and bracket;

Each of the at least one lens is provided with a curved surface at at least two positions, and the curved surface at each position is used to form at least one single lens;

The bracket is used to support the at least one lens.
The compound lens structure according to claim 18, wherein the shape of the curved surface of each lens at the at least two positions is the same.
The compound lens structure according to claim 18 or 19, wherein the at least one lens is a plurality of lenses, and the curved surface at each position is used to form a compound lens.
The compound lens structure according to claim 20, wherein the optical imaging parameters of the compound lens in the at least two positions are the same.
The compound lens structure according to claim 20, characterized in that at each position, the projection of the optical center of the curved surface of each lens on the first plane overlaps, and the first plane and the The upper surface plane or the lower surface plane of the first lens in the plurality of lenses is parallel.
The compound lens structure of claim 22, wherein the first lens is any lens of the plurality of lenses.
The compound lens structure according to any one of claims 18 to 23, wherein the compound lens structure further comprises:

At least one shading sheet, the at least one shading sheet and the at least one lens are alternately arranged;

Each of the at least one shading sheet is provided with at least two openings corresponding to the at least two positions.
The compound lens structure according to claim 24, wherein the number of the at least one lens is greater than or equal to the number of the at least one light-shielding sheet.
The compound lens structure according to claim 24, wherein the plurality of lenses are two lenses, and a light shielding sheet is provided between the two lenses.
The compound lens structure according to any one of claims 18 to 26, wherein the bracket is provided with an opening, and the at least one lens is disposed in the one opening.
The compound lens structure according to claim 27, wherein the thickness of the bracket in the peripheral area of the opening of the one opening is greater than the thickness of the bracket in the area away from the opening.
The compound lens structure according to claim 27, wherein a convex structure is formed on the upper surface of the bracket extending upward in the peripheral area of the opening of the one opening.
The compound lens structure according to claim 27, wherein the compound lens structure further comprises:

A fixing member for fixing the at least one lens in the one opening.
The compound lens structure according to claim 30, wherein the fixing member is located in a peripheral area of the opening of the one opening.
An electronic device, characterized in that it includes:

A display screen, the fingerprint identification device according to any one of claims 1 to 17; wherein the fingerprint identification device is provided below the display screen.
The electronic device according to claim 32, characterized in that the electronic device further comprises: an optical filter, disposed between the display screen and the fingerprint recognition module.
The electronic device according to claim 32 or 33, wherein the display screen is a liquid crystal display (LCD).
The electronic device according to claim 32 or 33, wherein the display screen is an organic light-emitting diode OLED display screen, and the light-emitting layer of the display screen includes a plurality of organic light-emitting diode light sources, wherein the fingerprint identification device uses At least part of the organic light emitting diode light source is used as an excitation light source for fingerprint identification.