WO2020082380A1

WO2020082380A1 - Fingerprint recognition apparatus, and electronic device

Info

Publication number: WO2020082380A1
Application number: PCT/CN2018/112231
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: CN109496313B; CN109496313A

Abstract

A fingerprint recognition apparatus and an electronic device are disclosed in embodiments of the present invention. The fingerprint recognition apparatus may be used with an electronic device having a display screen. The fingerprint recognition apparatus comprises: an optical fingerprint sensor that is provided below a display screen, such that the fingerprint collection area of said sensor is at least partially located within the display area of the display screen, the optical fingerprint sensor comprising at least two effective light sensing areas, and the at least two effective light sensing areas being used to detect an optical signal emanating from above the fingerprint collection area; and at least two optical lenses that are provided between the display screen and the optical fingerprint sensor, the plurality of optical lenses respectively corresponding to the plurality of effective light sensing areas, wherein each optical lens is used to guide an optical signal to the effective light sensing area thereof. The fingerprint recognition apparatus is able to collect even more fingerprint information without the thickness of the fingerprint recognition apparatus having to be increased, and allows for increased fingerprint recognition accuracy.

Description

Fingerprint identification device and electronic equipment

Technical field

Embodiments of the present application relate to the field of fingerprint identification technology, and more specifically, to a fingerprint identification device and electronic equipment.

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 optical fingerprint sensor and reflected by the finger. The reflected light carries the fingerprint information of the finger, thereby realizing the under-screen fingerprint recognition. The fingerprint recognition device usually includes an optical path modulator. The reflected light needs to be modulated by the optical path modulator to reach the optical fingerprint sensor. In order to obtain more fingerprint information, it is necessary to expand the field of view of the optical path modulator as much as possible to collect a larger area of fingerprint image At this time, it can be achieved by increasing the object distance between the optical path modulator and the display screen, but this will increase the thickness of the fingerprint recognition device. Therefore, how to collect more fingerprint images without increasing the thickness of the fingerprint recognition device, or how to reduce the thickness of the fingerprint recognition device under the condition of collecting fingerprint images of the same size, has become an urgent problem to be solved.

Summary of the invention

The embodiments of the present application provide a fingerprint identification device and an electronic device, which can collect more fingerprint information without increasing the thickness of the fingerprint identification device.

In a first aspect, a fingerprint identification device is provided, which is applied to an electronic device with a display screen. The fingerprint identification device includes:

An optical fingerprint sensor is arranged below the display screen so that its fingerprint collection area is at least partially within the display area of the display screen. To detect the reflected light signal it receives from above the fingerprint collection area;

At least two optical lenses for setting between the display screen and the optical fingerprint sensor, the at least two optical lenses respectively corresponding to the at least two effective photosensitive regions, wherein each optical lens is used for The light signal is directed to its corresponding effective photosensitive area.

In a possible implementation manner, the optical fingerprint sensor includes an optical fingerprint sensor chip, and the at least two effective photosensitive regions are located on the optical fingerprint sensor chip.

In a possible implementation manner, the optical fingerprint sensor includes a plurality of optical fingerprint sensor chips, and the at least two effective photosensitive regions are respectively located on different optical fingerprint sensor chips.

In a possible implementation manner, the optical fingerprint sensor includes a plurality of optical fingerprint sensor chips, and part of the at least two effective photosensitive regions are located on different optical fingerprint sensor chips.

In a possible implementation manner, each optical lens is used to guide the optical signal from one sub-region in the fingerprint collection region to its corresponding effective photosensitive region, wherein the part between the sub-regions corresponding to different optical lenses is overlapping.

In a possible implementation manner, each optical lens is used to guide the optical signal from a sub-region in the fingerprint collection region to its corresponding effective photosensitive region, wherein the sub-regions corresponding to different optical lenses are mutually Does not overlap.

In a possible implementation manner, the at least two optical lenses are arranged linearly.

In a possible implementation manner, the at least two optical lenses include three optical lenses, and the three optical lenses are arranged in a triangle.

In a possible implementation manner, the fingerprint identification device further includes a filter unit, the filter unit is disposed between the display screen and the optical fingerprint sensor, and the filter unit is used to make a light signal of a specific wavelength Transmission to the optical fingerprint sensor.

In a second aspect, an electronic device is provided, including: a display screen and the fingerprint recognition device in the first aspect or any possible implementation manner of the first aspect.

In a possible implementation, the display screen is a liquid crystal display LCD.

In a possible implementation manner, the display screen is an organic light-emitting diode display OLED, 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 Excitation light source for fingerprint identification.

Based on the above technical solution, the fingerprint recognition device includes at least two optical lenses corresponding to at least two effective photosensitive regions of the optical fingerprint sensor, wherein each optical lens is used to guide the optical signal reflected by the finger to The corresponding effective photosensitive area, because two or more optical lenses can guide the light signal reflected by more fingerprint images on the finger to the corresponding effective photosensitive area, the fingerprint recognition device can collect more fingerprints Information, thereby improving the accuracy of fingerprint recognition, and does not increase the thickness of the fingerprint recognition device.

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 partial cross-sectional view of the electronic device shown in Fig. 1 along A-A '.

3 is a schematic plan view of another electronic device to which this application can be applied.

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

FIG. 5 is a schematic diagram of a fingerprint recognition device including only one optical lens.

6 is a schematic block diagram of a fingerprint identification device according to an embodiment of the present application.

7 is a schematic diagram of a possible fingerprint identification device according to an embodiment of the present application.

8 is a schematic diagram of another possible fingerprint identification device according to an embodiment of the present application

FIG. 9 is a schematic diagram of the positional relationship between sub-regions corresponding to different optical lenses according to an embodiment of the present application.

FIG. 10 is a schematic diagram of the positional relationship between sub-regions corresponding to different optical lenses according to an embodiment of the present application.

FIG. 11 is a schematic diagram of a positional relationship between sub-regions corresponding to different optical lenses according to an embodiment of the present application.

12 is a schematic diagram of an effective photosensitive region corresponding to a plurality of optical lenses arranged linearly according to an embodiment of the present application.

FIG. 13 is an effective photosensitive area corresponding to three optical lenses arranged in a triangle according to an embodiment of the present application.

detailed description

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

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. Under-screen fingerprint recognition technology refers to the installation of a fingerprint recognition device (such as an optical fingerprint recognition device) under the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen, without the need for an area other than the display area on the front of the electronic device Set the 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.

1 and 2 show a schematic diagram of an electronic device 100 to which the fingerprint identification device according to an embodiment of the present application can be applied, wherein FIG. 1 is a schematic front view of the electronic device 100, and FIG. 2 is along the electronic device 100 shown in FIG. AA 'partial cross-sectional structure diagram.

As shown in FIG. 1 and FIG. 2, the electronic device 100 includes a display screen 120 and an optical fingerprint recognition device (hereinafter simply referred to as a fingerprint recognition device) 130, wherein the optical fingerprint recognition device 130 has one or more sensors An array, the sensing array is at least disposed in a partial area below the display screen 120, so that the fingerprint collection area (or sensing area) 103 of the optical fingerprint recognition device 130 is at least partially located in the display area 102 of the display screen 120 .

It should be understood that the area of the fingerprint collection area 103 may be different from the area of the sensing array of the optical fingerprint recognition device 130, for example, through optical path design such as lens imaging, reflective folding optical path design, or other optical path design such as light gathering or reflection , The area of the fingerprint collection area 103 of the optical fingerprint identification device 130 may be larger than the area of the sensing array of the optical fingerprint identification device 130. In other alternative implementations, if the light path is guided by, for example, light collimation, the fingerprint collection area 103 of the optical fingerprint identification device 130 may also be designed to be consistent with the area of the sensing array of the optical fingerprint identification device 130.

As shown in FIG. 1, the fingerprint collection area 103 is located in the display area 102 of the display screen 120, therefore, when the user needs to unlock the electronic device or other fingerprint verification, he only needs to press his finger In the fingerprint collection area 103 located in the display screen 120, fingerprint input can be realized. Since fingerprint detection can be implemented within the screen, the electronic device 100 adopting the above structure does not require a special reserved space on the front to set fingerprint keys (such as the Home key), so that a full-screen solution can be adopted, that is, the display area of the display screen 120 102 can be basically extended to the front of the entire electronic device 100.

As an embodiment, the display screen 120 may be a self-luminous display screen that uses a self-luminous display unit as a display pixel, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro light-emitting diode (Micro -LED) display screen. Taking an OLED display screen as an example, the optical fingerprint recognition device 130 may use the OLED display unit (i.e., OLED light source) of the OLED display screen 120 located in the fingerprint recognition area 103 as an excitation light source for optical fingerprint detection.

In other embodiments, the optical fingerprint recognition device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint recognition device 130 may be applicable 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 under-screen fingerprint detection of the LCD screen, the optical fingerprint system of the electronic device 100 may further include an excitation light source for optical fingerprint detection. The excitation light source may specifically be an infrared light source or a light source of a non-visible light of a specific wavelength, which may be provided under the backlight module of the liquid crystal display or the edge area under the protective cover of the electronic device 100, and the The optical fingerprint recognition device 130 may be disposed under the edge area of the liquid crystal panel or the protective cover and guided by the optical path so that the fingerprint detection light can reach the optical fingerprint recognition device 130; or, the optical fingerprint recognition device 130 may also be disposed at the The backlight module is below, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optics through openings or other optical design of the film layers such as the diffusion sheet, the brightness enhancement sheet, the reflection sheet, etc. Fingerprint recognition device 130.

In addition, the sensing array of the optical fingerprint recognition device 130 is specifically a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit as described above . When a finger touches, presses, or approaches (for ease of description, this application is collectively referred to as touch) on the fingerprint recognition area 103, the light emitted by the display unit of the fingerprint recognition area 103 is reflected on the fingerprint on the finger surface and forms reflected light The reflected light of the ridges and valleys of the finger fingerprint is different. The reflected light is received from the display screen 120 and received by the photodetector array and converted into a corresponding electrical signal, that is, a fingerprint detection signal. Based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby implementing an optical fingerprint recognition function in the electronic device 100.

It should be understood that, in a specific implementation, the electronic device 100 further includes a transparent 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 above and covering the front of the electronic device 100. Therefore, in the embodiments of the present application, the so-called finger touch, pressing or approaching on the display screen 120 actually refers to the finger touching, pressing or approaching the cover plate 110 above the display screen 120 or covering the cover plate 110 Surface of the protective layer. In addition, the electronic device 100 may further include a touch sensor, and the touch sensor may be specifically a touch panel, which may be provided on the surface of the display screen 120, or may be partially or wholly integrated into the display screen 120, namely The display screen 120 is specifically a touch display screen.

As an optional implementation manner, as shown in FIG. 2, the optical fingerprint recognition device 130 includes an optical detection unit 134 and an optical component 132. The optical detection unit 134 includes the sensor array and the sensor array. The reading circuit and other auxiliary circuits that are sexually connected can be fabricated on a chip through a semiconductor process; that is, the optical detection unit 134 can be fabricated on an optical imaging chip or an image sensor chip. The optical component 132 may be disposed above the sensing array of the optical detection unit 134, which may specifically include an optical filter or a filter, an optical path guiding structure, and other optical elements. The filter may be It is used to filter out the ambient light penetrating the finger, and the light path guiding structure is mainly used to guide the light path such as collimating, modulating or converging the downward propagating light to guide the reflected light reflected from the finger surface to The sensing array performs optical detection.

In a specific implementation, the optical component 132 may be packaged with the optical detection unit 134 in the same optical fingerprint chip, or the optical component 132 may be disposed outside the chip where the optical detection unit 134 is located, such as The optical component 132 is attached to the chip, or a part of the optical component 132 is integrated into the chip. Among them, the optical path guiding structure of the optical component 132 has various implementation solutions, for example, it may be specifically an optical path modulator or an optical path collimator made of a semiconductor silicon chip or other substrate, which has multiple optical path modulation units or A collimating unit, the optical path modulation unit or the collimating unit may be specifically a micro-hole array. Alternatively, the light guide layer may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses. After the reflected light reflected from the finger is collimated or condensed by the micro-hole array or the lens unit, and received by the optical sensing unit below it, the sensing array can detect the fingerprint image of the finger .

A circuit board 140, such as a flexible printed circuit (FPC), may also be provided under the optical fingerprint recognition device 130, and the optical fingerprint recognition device 130 may be soldered to the circuit board 140 through pads, for example. In addition, the circuit board 140 realizes electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 100. For example, the optical fingerprint recognition device 130 may receive the control signal of the processing unit of the electronic device 100 through the circuit board 140, and may also output the fingerprint detection signal to the electronic device through the circuit board 140 100 processing unit or control unit.

The optical fingerprint recognition device 130 shown in FIGS. 1 and 2 is a single sensor chip. The fingerprint recognition device of the embodiment of the present application can be applied to the scenario of a single sensor chip as shown in FIGS. 1 and 2, that is, it can also be It is used in the scenario of multi-sensor stitching as shown in Figures 3 and 4.

3 and 4 are schematic diagrams of another electronic device 200 to which the fingerprint identification device according to an embodiment of the present application can be applied. FIG. 3 is a schematic front view of the electronic device 200, and FIG. 4 is the electronic device 200 shown in FIG. A schematic view of a partial cross-sectional structure along AA '.

As shown in FIGS. 3 and 4, the electronic device 200 may include a display screen 220 and an optical fingerprint recognition device 240, wherein the display screen 220 has a display area 202, and the optical fingerprint recognition device 240 is disposed on the display screen 220 Below.

As an embodiment, the optical fingerprint recognition device 240 may specifically include one or more optical fingerprint sensors 242 (hereinafter also referred to as sensor chips) with an optical sensing array; the multiple optical fingerprint sensors 242 may be arranged side by side Below the display screen 220. Each optical sensing array includes a plurality of optical sensing units, and the area where the optical sensing array is located or its optical sensing area corresponds to the sensing area 203 of the optical fingerprint sensor 242 where it is located. The sensing areas of together constitute the fingerprint collection area 230 of the optical fingerprint recognition device 240. That is to say, the fingerprint collection area 230 of the optical fingerprint recognition device 240 may include a plurality of sub-areas, and each sub-area corresponds to a sensing area of one of the optical fingerprint sensor or the optical sensing array. As shown in FIG. 3, the fingerprint collection area 230 is located in the display area 202 of the display screen 220. Since multiple optical fingerprint sensors are arranged side by side, the fingerprint collection area 230 of the fingerprint recognition device 240 can be expanded The main area to the lower half of the display area 202, which is extended to the area where the finger is normally pressed, to realize the blind-press fingerprint input operation. In other alternative embodiments, when the number of the optical fingerprint sensors is sufficient, the fingerprint collection area 230 may also be extended to half a display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

In a specific embodiment, the multiple optical fingerprint sensors 242 of the optical fingerprint recognition device 240 may be individually packaged sensor chips, or may be fabricated as multiple chips (Die) and then packaged in the same chip package It can also be produced in different areas of the same chip through semiconductor processes. As an optional implementation manner, as shown in FIG. 4, an optical path modulator 244 may also be provided above the optical fingerprint sensor 242. Taking the optical path modulator 244 as an example, it can be attached to the sensing array of the optical fingerprint sensor 242 as an independent optical component, or it can be integrated within the chip of the optical fingerprint sensor 242 through a semiconductor process, thereby achieving Ultra-thin fingerprint recognition device 240. Specifically, the optical path modulator 244 may be an optical collimator using a through-hole array with a high aspect ratio, which is mainly used for collimating, modulating, and imaging fingerprint detection light propagating downward, so as to realize The reflected light reflected from the surface is guided to the sensing array for optical detection to obtain fingerprint image information.

Optionally, corresponding to the plurality of optical fingerprint sensors 242 of the optical fingerprint recognition device 240, there may be multiple optical path modulators 244, and each optical path modulator 244 corresponds to an optical fingerprint sensor, respectively, and are respectively attached It is disposed above its corresponding optical fingerprint sensor 242. Alternatively, the plurality of optical fingerprint sensors 242 may also share a whole optical path modulator 244, that is, the optical path modulator 244 has a sufficiently large area to cover the sensing array of the plurality of optical fingerprint sensors 242. In addition, between the optical path modulator 244 and the optical fingerprint sensor 242 or between the display screen 220 and the optical path modulator 244, other optical elements, such as a filter or Other optical diaphragms are mainly used to isolate the influence of external interference light on optical fingerprint detection. Wherein, the filter can be used to filter out ambient light penetrating the finger and entering the image recognition sensor 230 through the display screen 220, similar to the optical path modulator 244, the filter can be Each optical fingerprint sensor 242 is separately configured to filter out interference light, or a large-area filter may be used to cover the multiple optical fingerprint sensors 242 at the same time.

Alternatively, the optical path modulator 244 may also use an optical lens (Lens) instead of the above-mentioned optical collimator. A small hole may be formed above the optical lens through a light-shielding material to cooperate with the optical lens to converge fingerprint detection light to the lower side Optical fingerprint sensor 242 to achieve fingerprint imaging. Similarly, each optical fingerprint sensor 242 may be configured with an optical lens to perform fingerprint imaging, or the multiple optical fingerprint sensors 242 may also use the same optical lens to achieve light convergence and fingerprint imaging. In other alternative embodiments, each optical fingerprint sensor 242 may even have two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), and two or more optical lenses are simultaneously configured to cooperate with the two One or more sensing arrays perform optical imaging, thereby reducing the imaging distance and enhancing the imaging effect.

On the other hand, a circuit board 250, such as a flexible printed circuit (FPC), may also be provided under the optical fingerprint recognition device 240, and a plurality of optical fingerprint sensors 242 of the optical fingerprint recognition device 240 may pass The pad is soldered to the circuit board 250, and the circuit board 250 is used to realize electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 200.

In some implementations of the fingerprint identification device, the fingerprint identification device includes only one optical lens. For example, as shown in FIG. 5, the optical lens can guide the optical signal in the field of view (FOV) range to the effective photosensitive area of the optical fingerprint sensor. The area of the fingerprint collection area of the display screen is S, the optical lens is disposed between the display screen and the optical fingerprint sensor, the object distance of the optical lens from the display screen is P, and the image distance of the optical lens from the optical fingerprint sensor is Q, Among them, adjusting the object distance P can adjust the field of view of the optical lens, and adjusting the image distance Q can adjust the sharpness of the image formed on the effective photosensitive area of the optical fingerprint sensor. A filter unit is also arranged above the optical fingerprint sensor to filter out the stray light of interference to select the required light wavelength. The light emitted by the display screen is incident on the finger above the fingerprint collection area of the display screen, and the light reflected by the finger is collected by the optical lens and transmitted to the effective photosensitive area of the optical fingerprint sensor through the filter unit, or called the effective area (Active Array) , AA), photosensitive area, etc., to complete the detection of fingerprint images.

In order to obtain more fingerprint information, it is necessary to expand the field of view of the optical lens as much as possible to collect a larger area of fingerprint image to improve fingerprint matching performance. In this case, it can be achieved by increasing the object distance P between the optical lens and the display screen However, this results in a larger thickness of the entire fingerprint recognition device, and the thickness of the fingerprint recognition device directly affects the thickness of the electronic device to which it is applied. If the object distance P is not adjusted, the field of view of the optical lens will be restricted due to the object distance P.

In view of this, an embodiment of the present application proposes an off-screen fingerprint recognition technology, which can enable the fingerprint recognition device to collect more fingerprint information without increasing the thickness of the fingerprint recognition device. The fingerprint recognition device of the embodiment of the present application will be described in detail below with reference to FIGS. 6 to 13.

FIG. 6 shows a schematic diagram of a fingerprint identification device 600 according to an embodiment of the present application.

As shown in FIG. 6, the fingerprint recognition device 600 can be applied to an electronic device having a display screen. The fingerprint recognition device 600 includes an optical fingerprint sensor 610 and at least two optical lenses 620. among them:

An optical fingerprint sensor 610 is arranged below the display screen so that its fingerprint collection area is at least partially located within the display area of the display screen, and the optical fingerprint sensor 610 includes at least two effective photosensitive areas, each of which is effectively sensitive Each area is correspondingly provided with an optical sensor array for detecting the reflected light signal it receives from above the fingerprint collection area.

At least two optical lenses 620, configured to be disposed between the display screen and the optical fingerprint sensor 610, the at least two optical lenses respectively corresponding to the at least two effective photosensitive regions, wherein each optical lens is used In order to guide the light signal to its corresponding effective photosensitive area.

Since the fingerprint recognition device includes at least two optical lenses, the at least two optical lenses respectively correspond to at least two effective photosensitive regions of the optical fingerprint sensor, wherein each optical lens is used to guide the optical signal reflected by the finger to its corresponding effective Photosensitive area, so that two or more optical lenses can guide the light signal reflected by the fingerprint image on the finger to the corresponding effective photosensitive area, so the fingerprint recognition device can increase the thickness of the fingerprint recognition device without increasing the thickness Collect more fingerprint information, thereby improving the accuracy of fingerprint recognition, or reduce the thickness of the fingerprint recognition device under the condition of collecting the same fingerprint information.

For example, FIG. 7 is a schematic diagram of a possible fingerprint recognition device according to an embodiment of the present application. In FIG. 7, two optical lenses (optical lens 1 and optical lens 2) are used as examples, but fingerprint recognition in the embodiment of the present application The device may also include more optical lenses. The optical fingerprint sensor includes two effective photosensitive regions, and the optical lens 1 and the optical lens 2 are disposed between the display screen and the optical fingerprint sensor, wherein the object distance of the optical lens 1 and the optical lens 2 from the display screen is approximately P, and the optical lens 1 and The image distance of the optical lens 2 from the optical fingerprint sensor is approximately Q. The light emitted by the display screen is incident on the finger above the fingerprint collection area of the display screen, and the light reflected by the fingerprint patterns at different positions of the finger is collected by the optical lens 1 and the optical lens 2 respectively, and guided by the optical lens 1 and the optical lens 2 respectively To each corresponding effective photosensitive area, to complete the detection of fingerprint images.

It can be seen that the thickness of the fingerprint recognition device in FIG. 7 is the same as the thickness of the fingerprint recognition device in FIG. 5, but the fingerprint collection area of the fingerprint recognition device in FIG. 7 is significantly larger than that shown in FIG. 5 including only one optical lens The fingerprint collection area of the fingerprint recognition device. When using the same type of optical lens and using the same parameter optical path design such as the same P and Q, the area of the fingerprint collection area in FIG. 7 can be twice the area of the fingerprint collection area shown in FIG. Obtain more fingerprint information when the thickness of the fingerprint recognition device is increased.

Another example is a schematic diagram of another possible fingerprint identification device of the embodiment of the present application shown in FIG. 8. In FIG. 8, two optical lenses (optical lens 1 and optical lens 2) are still taken as an example, in which optical lens 1 and optical The object distance of lens 2 from the display screen is P ', where P' is less than P, and the image distance of optical lens 1 and optical lens 2 from the optical fingerprint sensor is Q. The optical fingerprint sensor includes two effective photosensitive areas, the light emitted by the display screen is incident on the finger above the fingerprint collection area of the display screen, and the light reflected by the fingerprint patterns at different positions of the finger is collected by the optical lens 1 and the optical lens 2 respectively, and The optical lens 1 and the optical lens 2 are respectively guided to their corresponding effective photosensitive areas, thereby completing the detection of the fingerprint image.

Compared with the fingerprint identification device shown in FIG. 5, since the distance between the optical lens and the display screen is reduced from P to P ', the area of the fingerprint collection area that can be detected by the effective photosensitive area corresponding to each optical lens becomes smaller However, the total area of the fingerprint collection area that can be detected by the effective photosensitive area corresponding to the optical lens 1 and the optical lens 2 can be the same as the area of the fingerprint collection area shown in FIG. 5, and in some cases, it can even be larger than that shown in FIG. 5. The area of the fingerprint collection area shown. Compared with the fingerprint identification device shown in FIG. 5, when the area of the fingerprint collection area has not changed, the thickness of the fingerprint identification device has been significantly reduced, which can further reduce the thickness of the electronic device to which the fingerprint identification device is applied.

In the embodiment of the present application, the optical fingerprint sensor may include one or more optical fingerprint sensor chips.

For example, the optical fingerprint sensor includes an optical fingerprint sensor chip, and the at least two effective photosensitive regions are located on the optical fingerprint sensor chip.

For another example, the optical fingerprint sensor includes a plurality of optical fingerprint sensor chips, and the at least two effective photosensitive regions are respectively located on different optical fingerprint sensor chips.

For another example, the optical fingerprint sensor includes a plurality of optical fingerprint sensor chips, and part of the effective photosensitive areas of the at least two effective photosensitive areas are located on different optical fingerprint sensor chips. For example, the fingerprint recognition device includes four optical lenses, and the optical fingerprint sensor includes two optical fingerprint sensor chips, where each optical fingerprint sensor chip has two effective photosensitive regions, so the optical fingerprint sensor includes four effective photosensitive regions, And each effective photosensitive area corresponds to an optical lens.

It should be understood that each effective photosensitive area of the optical fingerprint sensor may include an optical sensing array having a plurality of optical sensing units (or photosensitive pixels), and the area of the optical sensing array corresponds to the sensing area of the optical fingerprint sensor Multiple sensing areas together constitute the fingerprint collection area of the fingerprint recognition device.

Alternatively, the optical lens may be packaged with its corresponding optical fingerprint sensor chip; or, the optical lens may be installed inside the fingerprint recognition device as a relatively independent component from the optical fingerprint sensor.

Each optical lens in the fingerprint identification device is used to guide the optical signal from a sub-region in the fingerprint collection area of the display screen to its corresponding effective photosensitive area, that is, the at least two optical lenses are directed to their respective The optical signal of the effective photosensitive area carries fingerprint image information of different sub-areas. Optionally, the sub-regions corresponding to different optical lenses may not overlap each other, or may partially overlap.

Among the sub-regions corresponding to different optical lenses, the positional relationship between any two sub-regions may exist in the following three cases, which will be specifically described below with reference to FIGS. 9 to 11. Among them, in FIGS. 9 to 11, the circular area represents the field of view of the optical lens, and the square area represents the sub-area corresponding to the optical lens, that is, the actual detection area, and the fingerprint image in the actual detection area can be matched by The effective photosensitive area is detected.

Situation 1

The sub-regions do not overlap with each other.

For example, as shown in FIG. 9, taking two optical lenses (optical lens 1 and optical lens 2) as an example, the optical lens 1 corresponds to the sub-region 1 in the fingerprint collection area, and can reflect the optical signal reflected by the fingerprint pattern above the sub-region 1 Guide to its corresponding effective photosensitive area 1. The optical lens 2 corresponds to the sub-region 2 in the fingerprint collection region, and can guide the optical signal reflected by the fingerprint pattern above the sub-region 2 to its corresponding effective photosensitive region 2. As shown in FIG. 9, the sub-region 1 and the sub-region 2 may not overlap each other. In this way, the effective photosensitive area 1 and the effective photosensitive area 2 can each acquire fingerprint images of independent areas, and the utilization rate of the field of view of the optical lens is large.

Situation 2

The subregions partially overlap.

For example, as shown in FIG. 10, still taking optical lens 1 and optical lens 2 as an example, optical lens 1 corresponds to sub-region 1 in the fingerprint collection area, and can guide the optical signal reflected by the fingerprint pattern above sub-region 1 to its corresponding Effective photosensitive area 1. The optical lens 2 corresponds to the sub-region 2 in the fingerprint collection region, and can guide the optical signal reflected by the fingerprint pattern above the sub-region 2 to its corresponding effective photosensitive region 2. In FIG. 10, the sub-region 1 and the sub-region 2 partially overlap. This will result in poor utilization of the field of view of the optical lens. However, after the effective photosensitive area 1 and the effective photosensitive area 2 in the optical fingerprint sensor detect the reflected light signals from the fingerprint patterns of the sub-area 1 and the sub-area 2, respectively, they can The image stitching technology is used to process the detected fingerprint patterns on the two sub-regions, so that a large-area fingerprint image can be acquired at once.

Situation 3

As a special case between Case 1 and Case 2, the sub-regions are next to each other.

For example, as shown in FIG. 11, still taking optical lens 1 and optical lens 2 as an example, optical lens 1 corresponds to sub-region 1 in the fingerprint collection area, and can guide the optical signal reflected by the fingerprint pattern above sub-region 1 to its corresponding Effective photosensitive area 1. The optical lens 2 corresponds to the sub-region 2 in the fingerprint collection region, and can guide the optical signal reflected by the fingerprint pattern above the sub-region 2 to its corresponding effective photosensitive region 2. In FIG. 11, the adjacent sides of the sub-region 1 and the sub-region 2 coincide. In this case, the utilization rate of the field of view of the optical lens is not wasted, and a large area fingerprint image can be acquired based on the image stitching technology.

According to actual usage, the spacing relationship between the sub-regions corresponding to the at least two optical lenses can be satisfied by setting the spacing between the at least two optical lenses.

The embodiment of the present application does not make any limitation on the positional relationship between at least two optical lenses in the fingerprint identification device. The at least two optical lenses may be arranged in a straight line, for example, at equal intervals on a horizontal line, for example, the effective photosensitive area corresponding to the at least two optical lenses arranged in a straight line as shown in FIG. 12; or the at least two optical lenses The lenses can also be arranged in a specific pattern. For example, when the optical fingerprint device includes three optical lenses, the three optical lenses can be arranged in a triangle. For example, the three optical lenses in the triangular arrangement shown in FIG. 13 correspond to the effective Photosensitive area.

Optionally, the fingerprint identification device further includes a filter unit disposed between the display screen and the optical fingerprint sensor, and the filter unit is configured to transmit an optical signal of a specific wavelength to the optical Fingerprint sensor.

Wherein, the filtering unit may be disposed between the display screen and at least two optical lenses, or between the at least two optical lenses and the fingerprint recognition device.

The wavelength of the optical signal selected by the filtering unit may be, for example, a wavelength of visible light (370 nm-780 nm) or a wavelength of near infrared light (800 nm-1500 nm). Optical signals outside the wavelength corresponding to the filter unit will not pass through the filter unit to reach the optical sensing array of the optical fingerprint sensor, so it can be used to filter out stray light to obtain an effective optical signal.

Wherein, when the optical fingerprint sensor includes multiple optical fingerprint sensor chips, the fingerprint identification device may include multiple filter units, wherein each optical fingerprint sensor chip uses one filter unit, or several optical fingerprint sensor chips use one common The filter unit, or all the optical fingerprint sensor chips share a filter unit.

Alternatively, the filter unit may be packaged with its corresponding optical fingerprint sensor chip (for example, by coating with the sensor chip); or, the filter unit may be packaged with its corresponding optical lens above the sensor chip; Or, the filter unit is packaged with its corresponding sensor chip and optical lens; or, the filter unit is installed inside the fingerprint identification device as a relatively independent component from the optical fingerprint sensor and the optical lens.

It should be understood that in the fingerprint identification device of the embodiment of the present application, at least two optical lenses, such as at least two focusing lenses, are used to modulate the light from the fingerprint collection area. Of course, other types of optical path modulators may be used to The light in the collection area is modulated, such as microlens array, collimator, fiber array (with or without core).

The "at least two" described in the embodiments of the present application include two or more cases.

In the embodiment of the present application, in FIGS. 5, 6 to 8, 12 and 13, the parts filled with the same pattern may indicate that they have the same function, and for the sake of brevity, they are not described again. In addition, the embodiment of the present application does not make any limitation on the connection mode between the components in the fingerprint recognition device 600.

An embodiment of the present application also provides an electronic device. The electronic device may include a display screen and the fingerprint identification apparatus in the various embodiments of the present application described above.

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 OLED 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 sources as an excitation light source for fingerprint identification.

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 understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. For example, the singular forms "a", "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 meanings.

Those of ordinary skill in the art may realize that the units of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the interchangeability of hardware and software In the above description, the composition and steps of each example have been generally described according to function. 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 this application.

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

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

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The above integrated unit can be implemented in the form of hardware or software function unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application essentially or part of the contribution to the existing technology, or all or part of the technical solution can be embodied in the form of a software product, the computer software product is stored in a storage medium In it, several instructions are included 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 methods described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of various equivalents within the technical scope disclosed in this application Modifications or replacements, these modifications or replacements should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A fingerprint identification device is applied to an electronic device with a display screen. The fingerprint identification device includes:

An optical fingerprint sensor is arranged below the display screen so that its fingerprint collection area is at least partially within the display area of the display screen, the optical fingerprint sensor includes at least two effective photosensitive areas, and the at least two effective photosensitive areas The area is used to detect the optical signal from above the fingerprint collection area;

At least two optical lenses for setting between the display screen and the optical fingerprint sensor, the at least two optical lenses respectively corresponding to the at least two effective photosensitive regions, wherein each optical lens is used for The light signal is directed to its corresponding effective photosensitive area.
The fingerprint identification device according to claim 1, wherein the optical fingerprint sensor includes an optical fingerprint sensor chip, and the at least two effective photosensitive regions are located on the optical fingerprint sensor chip.
The fingerprint identification device according to claim 1, wherein the optical fingerprint sensor includes a plurality of optical fingerprint sensor chips, and the at least two effective photosensitive regions are respectively located on different optical fingerprint sensor chips.
The fingerprint identification device according to claim 1, wherein the optical fingerprint sensor includes a plurality of optical fingerprint sensor chips, and part of the effective photosensitive areas of the at least two effective photosensitive areas are located on different optical fingerprint sensor chips.
The fingerprint recognition device according to any one of claims 1 to 4, wherein each optical lens is used to guide the optical signal from a sub-region in the fingerprint collection region to its corresponding effective photosensitive region , Where the sub-regions corresponding to different optical lenses partially overlap.
The fingerprint recognition device according to any one of claims 1 to 4, wherein each optical lens is used to guide the optical signal from a sub-region in the fingerprint collection region to its corresponding effective photosensitive region , Where the sub-regions corresponding to different optical lenses do not overlap each other.
The fingerprint identification device according to any one of claims 1 to 6, wherein the at least two optical lenses are linearly arranged.
The fingerprint identification device according to any one of claims 1 to 6, wherein the at least two optical lenses include three optical lenses, and the three optical lenses are arranged in a triangle.
The fingerprint recognition device according to any one of claims 1 to 8, wherein the fingerprint recognition device further includes a filter unit, and the filter unit is disposed between the display screen and the optical fingerprint sensor, The filtering unit is used to transmit the optical signal of a specific wavelength to the optical fingerprint sensor.
An electronic device, characterized in that it includes:

The display, and

The fingerprint recognition device according to any one of claims 1 to 8.
The electronic device according to claim 10, wherein the display screen is a liquid crystal display (LCD).
The electronic device according to claim 10, wherein the display screen is an organic light-emitting diode display OLED, 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.