CN111837128A - Fingerprint anti-counterfeiting method, fingerprint identification device and electronic device - Google Patents

Abstract

The embodiment of the application relates to a fingerprint anti-counterfeiting method, a fingerprint identification device and electronic equipment, which can better defend attack of 2D false fingerprints. This fingerprint identification device sets up in electronic equipment's display screen below, and the fingerprint detection area of this display screen includes first luminous region and second luminous region, and this fingerprint identification device includes: an optical path guiding structure for guiding a first optical signal of first return optical signals to the optical sensor, the first return optical signal being an optical signal returned after the light-emitting display pixels in the first light-emitting area do not emit light and the light emitted by the light-emitting display pixels in the second light-emitting area irradiates a finger; the optical sensor is used for receiving the first optical signal and comprises a first sensing area corresponding to the first light-emitting area, and the first optical signal received by the first sensing area is used for fingerprint anti-counterfeiting authentication.

Description

Fingerprint anti-counterfeiting method, fingerprint identification device and electronic device

technical field

The present application relates to the field of biometric identification, in particular to a fingerprint anti-counterfeiting method, a fingerprint identification device and an electronic device.

Background technique

Optical fingerprints are easier to crack than capacitive fingerprints, especially 2D printing/extraction-like fake fingerprints that are cheap and easy to obtain pose a greater threat to optical fingerprints. With the gradual popularization of under-screen optical fingerprint unlocking and payment applications, the improvement of optical fingerprint security is imminent.

At present, the method of using 2D fake fingerprint color to resist can solve some fake fingerprints that are different from real fingers.

SUMMARY OF THE INVENTION

The present application provides a fingerprint anti-counterfeiting method, a fingerprint identification device and an electronic device, which can better defend against 2D false fingerprint attacks.

In a first aspect, a fingerprint identification device is provided, which is arranged below a display screen of an electronic device, the display screen includes a fingerprint detection area, and the fingerprint detection area includes a first light-emitting area and a second light-emitting area, the fingerprint identification device Including: an optical path guiding structure for guiding a first optical signal in the first return optical signal to an optical sensor, the first return optical signal is that the light-emitting display pixels in the first light-emitting area do not emit light and the first light-emitting area does not emit light. The light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area irradiates the finger; an optical sensor, located under the light-path guiding structure, is used for receiving the first light signal, and the optical sensor includes a signal corresponding to the The first sensing area of the first light-emitting area, and the first optical signal received by the first sensing area is used for fingerprint anti-counterfeiting authentication.

Therefore, in the fingerprint recognition device of the embodiment of the present application, a part of the non-luminous area is set in the fingerprint detection area, and the real finger will have transmitted light in this part, while the 2D fake fingerprint has no transmitted light, so according to the fingerprint recognition device and the non-luminous area The light intensity of the optical signal received by the sensing area corresponding to the area can identify real fingers and 2D fake fingerprints, that is, the difference in light intensity can be used to better defend against 2D fake fingerprint attacks, which can further ensure the security of optical fingerprint identification.

With reference to the first aspect, in an implementation manner of the first aspect, the optical sensor includes a second sensing area corresponding to the second light-emitting area, and the second sensing area receives the first The light signal is used to fingerprint the finger.

With reference to the first aspect and the above implementation manners thereof, in another implementation manner of the first aspect, the optical path guiding structure is further configured to: guide the second optical signal in the second returned optical signal to the optical sensor, The second return light signal is the light signal returned after the light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and illuminate the finger; the optical sensor is further used for: receiving the second light-emitting area an optical signal, the second optical signal is used for fingerprint identification of the finger.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the area of the second light-emitting region is larger than the area of the first light-emitting region.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the area of the first light-emitting region is smaller than the field of view area of the optical sensor.

With reference to the first aspect and the above implementation manners thereof, in another implementation manner of the first aspect, the first light-emitting area is located in a central area or an edge area of the fingerprint detection area.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the first area is distributed symmetrically with respect to the center point of the fingerprint detection area.

With reference to the first aspect and the above-mentioned implementation manner, in another implementation manner of the first aspect, the first light-emitting region is a single-connected region.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the first light-emitting area is a square or a circle.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the first light-emitting area includes a plurality of disconnected areas.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the first light-emitting area includes multiple strip-shaped areas or multiple ring-shaped areas.

With reference to the first aspect and the above implementation manners thereof, in another implementation manner of the first aspect, the color of the light irradiating the finger emitted by the light-emitting display pixels in the second light-emitting area is any one of the following colors Species: Pure Red, Pure Green, Pure Cyan, Pure White, Gradient Green, Gradient Cyan, and Gradient White.

In combination with the first aspect and the above implementation manners thereof, in another implementation manner of the first aspect, the optical path guiding structure includes an optical lens; or, the optical path guiding structure includes a An optical collimator, the optical collimator is used to transmit the first optical signal to the corresponding optical sensing unit in the sensing array of the optical sensor through the plurality of collimating units or the micro-hole array respectively.

With reference to the first aspect and the above implementation manners thereof, in another implementation manner of the first aspect, the optical path guiding structure includes a microlens array having a plurality of microlenses and a light blocking layer having a plurality of microholes, and the The microlens array is used to focus the first optical signal to the corresponding microholes of the light blocking layer through the plurality of microlenses, and transmit the first optical signal to the corresponding microholes in the sensing array of the optical sensor through the microholes Optical sensing unit.

With reference to the first aspect and the above implementation manners thereof, in another implementation manner of the first aspect, in the case where the optical path guiding structure includes a microlens array with a plurality of microlenses and a light blocking layer with a plurality of microholes Next, the optical sensor is configured to receive light signals in multiple directions, and the light signals in the multiple directions include light signals that are perpendicular to the display screen and/or light signals that are inclined relative to the display screen.

With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the fingerprint identification device further includes: a processor configured to receive the first The light intensity of the light signal determines whether the finger is a real finger.

In combination with the first aspect and the above-mentioned implementation manner, in another implementation manner of the first aspect, if the light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, the The processor is further configured to determine that the finger is a real finger; if the light intensity of the first optical signal received by the first sensing area is less than the preset value, the processor is further configured to determine the The finger described is a fake finger.

In a second aspect, an electronic device is provided, comprising: the fingerprint identification device in the first aspect or any possible implementation manner of the first aspect, a display screen and a processor, the display screen is used for displaying an image, the The display screen includes a fingerprint detection area, and the fingerprint detection area includes a first light-emitting area and a second light-emitting area; the processor is configured to: receive the first light-emitting area according to the first sensing area included in the optical sensor The light signal is used to perform fingerprint anti-counterfeiting authentication on the finger.

Therefore, in the electronic device of the embodiment of the present application, a part of the non-luminous area is set in the fingerprint detection area, and the real finger will have transmitted light in this part, while the 2D fake fingerprint has no transmitted light, so according to the fingerprint identification device and the non-luminous area The light intensity of the optical signal received by the corresponding sensing area can identify real fingers and 2D fake fingerprints, that is, the difference in light intensity can be used to better defend against 2D fake fingerprint attacks, which can further ensure the security of optical fingerprint identification.

With reference to the second aspect, in an implementation manner of the second aspect, if the light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, the processor is further configured to: determining that the finger is a real finger; if the light intensity of the first optical signal received by the first sensing area is less than the preset value, the processor is further configured to determine that the finger is a fake finger.

With reference to the second aspect and the foregoing implementation manners thereof, in another implementation manner of the second aspect, the optical sensor includes a second sensing area corresponding to the second light-emitting area, and the processor is further configured to: Fingerprint recognition is performed on the finger according to the first optical signal received by the second sensing area.

With reference to the second aspect and the foregoing implementation manners thereof, in another implementation manner of the second aspect, the processor is further configured to: perform fingerprint recognition on the finger according to the second optical signal received by the optical sensor , wherein the second optical signal is an optical signal of the second returning optical signal that is guided into the optical sensor through the optical path guiding structure, and the second returning optical signal is the first light-emitting area and the The light-emitting display pixels in the second light-emitting area all emit light and return light signals after irradiating the finger.

In a third aspect, a fingerprint anti-counterfeiting method is provided, the method comprising: acquiring a first light signal of a finger touching a fingerprint detection area of a display screen, where the fingerprint detection area includes a first light-emitting area and a second light-emitting area, A fingerprint identification device is arranged below the display screen, and the fingerprint identification device includes an optical path guiding structure and an optical sensor, and the first optical signal is the first returning optical signal that is guided into the optical sensor through the optical path guiding structure The first return light signal is the light signal returned after the light-emitting display pixels in the first light-emitting area do not emit light and the light emitted by the light-emitting display pixels in the second light-emitting area irradiates the finger. The optical sensor includes a first sensing area corresponding to the first light-emitting area; according to the first light signal received by the first sensing area, fingerprint anti-counterfeiting authentication is performed on the finger.

Therefore, the fingerprint anti-counterfeiting method of the embodiment of the present application is applied to an electronic device including a fingerprint identification device under the screen. The electronic device sets a part of the non-luminous area in the fingerprint detection area, and the real finger will have transmitted light in this part, while the 2D The fake fingerprint has no transmitted light, so according to the light intensity of the light signal received by the sensing area corresponding to the non-light-emitting area in the fingerprint identification device, the real finger and the 2D fake fingerprint can be identified, that is, the difference in light intensity can be used for better defense. The attack of 2D fake fingerprints can further ensure the security of optical fingerprint identification.

With reference to the third aspect, in an implementation manner of the third aspect, performing fingerprint anti-counterfeiting authentication on the finger according to the first optical signal received in the first sensing area includes: if the The light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, and the finger is determined to be a real finger; if the intensity of the first optical signal received by the first sensing area is If the light intensity is less than the preset value, it is determined that the finger is a fake finger.

With reference to the third aspect and the foregoing implementation manners thereof, in another implementation manner of the third aspect, the optical sensor includes a second sensing area corresponding to the second light-emitting area, and the method further includes: according to the The first optical signal received by the second sensing area is used to perform fingerprint recognition on the finger.

With reference to the third aspect and the foregoing implementation manners thereof, in another implementation manner of the third aspect, the method further includes: acquiring a second optical signal of the finger, where the second optical signal is a second returned optical signal The light signal that is guided into the optical sensor after passing through the light path guiding structure in the middle, the second return light signal is that the light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and illuminate the finger The optical signal returned later; according to the second optical signal received by the optical sensor, fingerprint recognition is performed on the finger.

In a fourth aspect, an electronic device is provided, comprising: a storage unit and a processor, where the storage unit is used for storing instructions, the processor is used for executing the instructions stored in the memory, and when the processor executes the instructions stored in the memory , the execution causes the processor to execute the method of the third aspect or any possible implementation of the third aspect.

In a fifth aspect, a computer-readable medium is provided for storing a computer program, the computer program comprising instructions for performing the method of the third aspect or any possible implementation of the third aspect.

A sixth aspect provides a computer program product comprising instructions, when a computer runs the finger of the computer program product, the computer executes the fingerprint in the third aspect or any possible implementation manner of the third aspect Methods of identification and anti-counterfeiting. Specifically, the computer program product can run on the electronic device of the fourth aspect.

Description of drawings

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

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

FIG. 3 is another schematic structural diagram of an electronic device to which the present application can be applied.

FIG. 4 is a schematic cross-sectional view of the electronic device shown in FIG. 3 .

FIG. 5 is a schematic diagram of the light path created by light irradiating a real finger touching an electronic device.

FIG. 6 is a schematic diagram of the optical path created by a 2D artificial finger irradiating the surface of an electronic device with light.

FIG. 7 is a schematic side view of an electronic device according to an embodiment of the present application when fingerprint detection is performed.

FIG. 8 is a schematic front view of an electronic device according to an embodiment of the present application.

FIG. 9 is a schematic diagram of fingerprinting on an electronic device with a 2D fake finger according to an embodiment of the present application.

FIG. 10 is a schematic diagram of the fingerprint detection area and the shape and position of the first light-emitting area included in the fingerprint detection area according to the embodiment of the present application.

FIG. 11 is a schematic diagram of the fingerprint detection area and the color of the first light-emitting area included in the fingerprint detection area according to the embodiment of the present application.

FIG. 12 is a schematic diagram of a fingerprint detection area used for fingerprint identification and fingerprint anti-counterfeiting according to an embodiment of the present application.

FIG. 13 is a schematic diagram of two fingerprint detection areas respectively used for fingerprint identification and fingerprint anti-counterfeiting according to an embodiment of the present application.

FIG. 14 is a schematic flowchart of a fingerprint anti-counterfeiting method according to an embodiment of the present application.

Detailed ways

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

The technical solutions of the embodiments of the present application can be applied to various electronic devices. Examples include portable or mobile computing devices such as smartphones, laptops, tablets, gaming devices, and other electronic devices such as electronic databases, automobiles, and bank Automated Teller Machines (ATMs). However, the embodiments of the present application do not limit this.

The technical solutions of the embodiments of the present application can be used for biometric identification technology. Among them, biometric identification technologies include but are not limited to identification technologies such as fingerprint identification, palmprint identification, iris identification, face identification, and living body identification. For convenience of description, the following description takes the fingerprint identification technology as an example.

The technical solutions of the embodiments of the present application can be used for the off-screen fingerprint recognition technology and the on-screen fingerprint recognition technology.

The under-screen fingerprint recognition technology refers to installing the fingerprint recognition module under the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen, and it is not necessary to set a fingerprint collection area on the front of the electronic device except the display area. Specifically, the fingerprint recognition module uses light returned from the top surface of the display assembly of the electronic device for fingerprint sensing and other sensing operations. This returned light carries information on objects (such as fingers) in contact with or approaching the top surface of the display assembly. The fingerprint recognition module located below the display assembly collects and detects this returned light to realize off-screen fingerprint recognition. Wherein, the design of the fingerprint identification module can be such that desired optical imaging can be realized by properly configuring the optical element for collecting and detecting the returned light, so as to detect the fingerprint information of the finger.

Correspondingly, the in-display fingerprint recognition technology refers to installing the fingerprint recognition module or part of the fingerprint recognition module inside the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen, without the need for electronic The fingerprint collection area is set on the front of the device except the display area.

1 to 4 are schematic diagrams of electronic devices to which the embodiments of the present application may be applied. 1 and 3 are schematic diagrams of orientation of the electronic device 10 , and FIGS. 2 and 4 are schematic cross-sectional views of the electronic device 10 shown in FIGS. 1 and 3 , respectively.

Referring to FIGS. 1 to 4 , the electronic device 10 may include a display screen 120 and an optical fingerprint recognition module 130 .

The display screen 120 may be a self-luminous display screen, which uses a display unit having 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 light-emitting diode (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 this embodiment of the present application. Further, the display screen 120 may also be specifically a touch display screen, which can not only display a screen, but also detect a user's touch or pressing operation, thereby providing a human-computer interaction interface for the user. For example, in an embodiment, the electronic device 10 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 partially integrated or The whole is integrated into the display screen 120 to form the touch display screen.

The optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131 (also referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.). The area where the sensing array 133 is located or its sensing area is the sensing area of the optical fingerprint module 130 , which corresponds to the fingerprint detection area 103 on the display screen 120 (also referred to as fingerprint collection area, fingerprint identification area, etc.) . For example, the optical sensing unit 131 may be a photodetector, that is, the sensing array 133 may specifically be a photodetector array, which includes a plurality of photodetectors distributed in an array.

Wherein, the optical fingerprint module 130 may be disposed in a partial area below the display screen 120 .

Please continue to refer to FIG. 1 , the fingerprint detection area 103 may be located within the display area of the display screen 120 , but the sensing area of the optical fingerprint module 130 may or may not be within the display area of the display screen 120 . In an alternative embodiment, the optical fingerprint module 130 may also be disposed at other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the electronic device 10, that is, the optical fingerprint module The sensing area of 130 can be located in any area of the electronic device 10, and the optical signal from at least part of the display area of the display screen 120 is guided into the sensing area of the optical fingerprint module 130 through the optical path design, Therefore, the fingerprint detection area 103 also touched by a finger is actually located in the display area of the display screen 120 , while the sensing area of the optical fingerprint module 130 may or may not be in the display area of the display screen 120 .

For the electronic device 10, when the user needs to unlock the electronic device 10 or perform other fingerprint verification, the user only needs to press the finger on the fingerprint detection area 103 located on the display screen 120 to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 using the above structure does not need to reserve a space on the front of the electronic device 10 to set a fingerprint button (such as the Home button), so that a full-screen solution can be adopted, that is, the display area of the display screen 120 It can extend to substantially the entire front of the electronic device 10 .

Please continue to refer to FIG. 2 , the optical fingerprint module 130 may include a light detection part 134 and an optical component 132 . The light detection part 134 includes the sensing array 133 (also referred to as an optical fingerprint sensor), a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which can be fabricated on a chip by a semiconductor process. (Die), such as an optical imaging chip or an optical fingerprint sensor. The optical component 132 may be disposed above the sensing array 133 of the light detection part 134, and may specifically include a filter layer (Filter), a light guide layer or a light path guide structure, and other optical elements, the filter layer. It can be used to filter out ambient light penetrating the finger, and the light guide layer or the light path guiding structure is mainly used to guide the reflected light reflected from the finger surface to the sensing array 133 for optical detection.

In some embodiments of the present application, the optical assembly 132 and the light detection part 134 may be packaged in the same optical fingerprint component. For example, the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 It is attached above the chip, or some components of the optical component 132 are integrated into the chip.

In some embodiments of the present application, the area or light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130 . Wherein, the fingerprint detection area 103 of the optical fingerprint module 130 (or the fingerprint detection area 103 on the display screen 120 ) may or may not be equal to the area or light of the area where the sensing array 133 of the optical fingerprint module 130 is located. The sensing range is not specifically limited in this embodiment of the present application.

For example, the optical path is guided by light collimation, and the fingerprint detection area 103 of the optical fingerprint module 130 can be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130 .

For another example, the area of the fingerprint detection area 103 of the optical fingerprint module 130 can be made larger than that of the optical fingerprint module by, for example, optical path design of lens imaging, reflective folding optical path design, or other optical path designs such as light convergence or reflection. 130 of the area of the sensing array 133 .

The following is an exemplary description of the optical path guiding structure that the optical assembly 132 may include.

Optionally, taking an optical collimator having a high aspect ratio through-hole array as an example for the optical path guiding structure, the optical collimator may specifically be a collimator fabricated on a semiconductor silicon wafer. layer, which has a plurality of collimating units or micro-holes, the collimating units can be specifically small holes, and the light that is perpendicularly incident to the collimating unit can pass through and be absorbed by the reflected light from the finger. The light with an excessively large incident angle is attenuated by multiple reflections inside the collimation unit, so each sensor chip can basically only receive the reflected light from the fingerprint pattern directly above it, which can Effectively improve the image resolution, thereby improving the fingerprint recognition effect.

Optionally, taking the optical path design of an optical lens as an example for the optical path guiding structure, the optical path guiding structure may be an optical lens (Lens) layer, which has one or more lens units, such as one or more aspherical lenses. A lens group is formed, which is used to condense the reflected light from the finger to the sensing array 133 of the light detection part 134 below it, so that the sensing array 133 can perform imaging based on the reflected light, so as to obtain the Fingerprint image. Further, the optical lens layer may also be formed with pinholes or micro-aperture diaphragms in the optical path of the lens unit, for example, one or more light shielding sheets may be formed in the optical path of the lens unit, wherein at least A light-shielding sheet may be formed with light-transmitting micro-holes in the optical axis or optical center region of the lens unit, and the light-transmitting micro-holes may be used as the above-mentioned pinholes or micro-aperture diaphragms. The pinhole or micro-aperture diaphragm can cooperate with the optical lens layer and/or other optical film layers above the optical lens layer to expand the field of view of the optical fingerprint module 130 to improve the optical fingerprint module 130 fingerprint imaging effect.

Optionally, taking the optical path design of the optical path guiding structure using a micro-lens (Micro-Lens) layer as an example, the optical path guiding structure may include a microlens array formed by a plurality of microlenses, which may be formed by a semiconductor growth process. Or other processes are formed above the sensing array 133 of the light detection part 134 , and each microlens may correspond to one or more sensing units of the sensing array 133 respectively. In addition, other optical film layers, such as a dielectric layer or a passivation layer, may also be formed between the microlens layer and the sensing unit. More specifically, a light-blocking layer (or called a light-shielding layer, a light-blocking layer, etc.) with micro-holes (or called openings) may be further included between the micro-lens layer and the sensing unit, wherein the micro- The hole is formed between its corresponding microlens and the sensing unit, and the light blocking layer can block the optical interference between adjacent microlenses and the sensing unit, and make the light corresponding to the sensing unit converge through the microlens into the inside of the micro-hole and transmitted to the sensing unit via the micro-hole for optical fingerprint imaging; or, by adjusting the position of the light-blocking layer or the position of the micro-hole included in the light-blocking layer, so that the display can be obtained from the display. The oblique light signals in multiple directions reflected by the finger above the screen 120 are collected by the microlens layer, and then transmitted to the plurality of sensing units through the openings provided in at least one light-blocking layer, respectively. The signal is used to detect the fingerprint information of the finger. That is to say, through the provided microlens array and the light blocking layer with a plurality of microholes, the sensing array 133 of the lower light detection part 134 can receive light signals in multiple directions, and the light signals in the multiple directions may include The light signal perpendicular to the display screen and/or the light signal inclined relative to the display screen is not limited to this embodiment of the present application.

It should be understood that the above several implementation solutions for the optical path guiding structure can be used alone or in combination.

For example, a microlens layer may be further disposed above or below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, its specific stack structure or optical path may need to be adjusted according to actual needs.

On the other hand, the optical component 132 may further include other optical elements, such as a filter layer (Filter) or other optical films, which may be disposed between the optical path guiding structure and the optical fingerprint sensor or disposed in all The space between the display screen 120 and the optical path guiding structure is mainly used to isolate the influence of external interference light on the optical fingerprint detection. The filter layer can be used to filter out ambient light that penetrates the finger and enters the optical fingerprint sensor through the display screen 120. Similar to the optical path guiding structure, the filter layer can be used for each The optical fingerprint sensors are separately arranged to filter out interfering light, or a large-area filter layer can be used to cover the multiple optical fingerprint sensors at the same time.

The fingerprint identification module 130 may be used to collect fingerprint information (such as fingerprint image information) of the user.

Taking the display screen 120 as an example of a display screen having a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro-light-emitting diode (Micro-LED) display screen. The optical fingerprint module 130 can use the display unit (ie, the OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed on the fingerprint detection area 103, the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected on the surface of the finger 140 to form reflected light or passes through all the The finger 140 is internally scattered to form scattered light (transmitted light). In the related patent application, for the convenience of description, the above-mentioned reflected light and scattered light are collectively referred to as return light. Since the ridges 141 and the valleys 142 of the fingerprint have different reflection capabilities for light, the returned light 151 from the fingerprint ridges and the returned light 152 from the fingerprint valleys have different light intensities, and the returned light passes through the optical component 132 Then, it is received by the sensing array 133 in the optical fingerprint module 130 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 The optical fingerprint recognition function is implemented in the electronic device 10 .

In other alternative solutions, the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the optical fingerprint module 130 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 application in a liquid crystal display with a backlight module and a liquid crystal panel as an example, in order to support fingerprint detection under the LCD screen, the optical fingerprint system of the electronic device 10 may further include an excitation light source for optical fingerprint detection, the excitation The light source can be specifically an infrared light source or a light source of non-visible light with a specific wavelength, which can be arranged under the backlight module of the liquid crystal display or in the edge area under the protective cover of the electronic device 10, and the optical fingerprint module. 130 can be arranged 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 module 130; or, the optical fingerprint module 130 can also be arranged in the backlight module. below, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130 by making holes or other optical designs on film layers such as diffusion sheets, brightening sheets, and reflective sheets. . When the optical fingerprint module 130 uses a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is consistent with the above description.

In terms of specific implementation, the electronic device 10 may further include a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers the front surface of the electronic device 10 . Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.

On the other hand, the optical fingerprint module 130 may include only one optical fingerprint sensor. At this time, the fingerprint detection area 103 of the optical fingerprint module 130 has a small area and a fixed position, so the user needs to press the finger when inputting the fingerprint. Otherwise, the optical fingerprint module 130 may not be able to collect the fingerprint image, resulting in poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include multiple optical fingerprint sensors. The multiple optical fingerprint sensors can be arranged side by side under the display screen 120 by splicing, and the sensing areas of the multiple optical fingerprint sensors together constitute the sensing area of the optical fingerprint module 130. The area corresponds to the fingerprint detection area 103 of the display screen 120 . Therefore, the fingerprint detection area 103 corresponding to the optical fingerprint module 130 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is usually pressed, thereby realizing the blind-pressing fingerprint input operation. Further, when the number of the optical fingerprint sensors is sufficient, the fingerprint detection area 103 can also be extended to half the display area or even the entire display area, so as to realize fingerprint detection on a half screen or a full screen.

Referring to FIGS. 3 and 4 , the optical fingerprint module 130 in the electronic device 10 may include multiple optical fingerprint sensors, and the multiple optical fingerprint sensors may be arranged side by side on the display screen 120 by, for example, splicing or the like. Below, and the sensing areas of the plurality of optical fingerprint sensors together constitute the fingerprint detection area 103 of the optical fingerprint device 130 .

Further, the optical assembly 132 may include a plurality of optical path guiding structures, each of which corresponds to an optical fingerprint sensor (ie, the sensing array 133 ), and is respectively attached and disposed above its corresponding optical fingerprint sensor. Alternatively, the plurality of optical fingerprint sensors may also share an integral optical path guiding structure, that is, the optical path guiding structure has an area large enough to cover the sensing arrays of the plurality of optical fingerprint sensors.

For example, taking the optical module 132 using an optical collimator with a high aspect ratio through-hole array as an example, when the optical fingerprint module 130 includes a plurality of optical fingerprint sensors, the optical fingerprint sensor of each optical fingerprint sensor can be An optical sensing unit in the sensing array is configured with one or more collimation units, and is attached and arranged above its corresponding optical sensing unit. Of course, the multiple optical sensing units may also share one collimating unit, that is, the one collimating unit has an aperture large enough to cover the multiple optical sensing units. Since one collimation unit may correspond to multiple optical sensing units or one optical sensing unit may correspond to multiple collimation units, the correspondence between the space period of the display screen 120 and the space period of the optical fingerprint sensor is destroyed. The spatial structure of the light-emitting display array is similar to that of the optical sensing array of the optical fingerprint sensor, which can also effectively prevent the optical fingerprint module 130 from using the optical signal passing through the display screen 120 to perform fingerprint imaging to generate Moiré fringes, effectively improving the optical fingerprint model. Fingerprint recognition effect of group 130.

For another example, taking the optical assembly 132 using an optical lens as an example, when the optical fingerprint module 130 includes multiple sensor chips, each sensor chip can be configured with an optical lens for fingerprint imaging, or a plurality of sensor chips can be configured with one optical lens. Optical lens to achieve light convergence and fingerprint imaging. Even when a sensor chip has two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), this sensor chip can also be configured with two or more optical lenses to cooperate with the two sensing arrays or Multiple sensing arrays perform optical imaging to reduce imaging distance and enhance imaging.

It should be understood that the accompanying drawings 1 to 4 are only examples of the present application, and should not be construed as limiting the present application.

For example, the present application does not specifically limit the number, size and arrangement of fingerprint sensors, which can be adjusted according to actual needs. For example, the optical fingerprint module 130 may include a plurality of fingerprint sensors distributed in a square or a circle.

Considering that the principle of optical fingerprints is easier to crack than capacitive fingerprints, especially the low-cost and easy-to-obtain 2D printing/extraction-like fake fingerprints pose a greater threat to optical fingerprints. At present, the method of using fake fingerprint color to resist can solve some fake fingerprints that are different from real fingers, but the anti-counterfeiting effect is poor for flesh-colored or reddish fake fingerprints that are similar in color to real fingers. A new 2D fake fingerprint anti-counterfeiting method.

Specifically, as shown in FIG. 5 , still taking the electronic device 10 shown in FIGS. 1 to 4 as an example, considering that when the real finger 140 touches the fingerprint detection area 103 on the display screen 120 , it is assumed that the display screen 120 includes The light-emitting display pixels are used to provide the light source for fingerprint recognition, then the light emitted by it (ie, the incident light indicated by the solid line in FIG. 5 ) irradiates the finger 140 and may be reflected at the fingerprint ridges and fingerprint valleys on the surface of the finger 140 and transmission, corresponding to the reflected light indicated by the dotted line and the transmitted light indicated by the dot-dash line in FIG.

However, as shown in FIG. 6 , if it is not a real finger touching the fingerprint detection area 103 on the display screen 120 for fingerprint recognition, but a 2D fake finger touches the fingerprint detection area 103, the 2D fake finger is a plane, it is still assumed that the The light-emitting display pixels included in the display screen 120 are used to provide the light source for fingerprint identification, so after the light emitted by the display screen 120 illuminates the fake finger, only reflected light will be generated, that is to say, the light that the optical fingerprint module 130 can receive includes sources from the fake finger. The reflected light of the fingerprint itself, not including the transmitted light.

Therefore, for real fingers and 2D fake fingerprints, the real and fake fingerprints can be distinguished based on whether there is a transmitted light principle. However, after the light-emitting display pixels emit light in the fingerprint detection area 103 of the display screen 120, the generated reflected light and transmitted light will be mixed together and cannot be extracted separately, so that the distinguishing principle cannot be used. Therefore, the embodiments of the present application propose a fingerprint anti-counterfeiting method, a fingerprint identification device and an electronic device, which perform fingerprint identification and fingerprint anti-counterfeiting authentication based on the difference in transmitted light between a real finger and a 2D fake fingerprint.

FIG. 7 shows a partial schematic diagram of an electronic device 20 according to an embodiment of the present application, which is a side view of the electronic device 20 ; and FIG. 8 shows a front view of the electronic device 20 according to an embodiment of the present application. As shown in FIG. 7 and FIG. 8 , the electronic device 20 includes a display screen 200 and a fingerprint identification device 300 , and the display screen 200 is located above the fingerprint identification device 300 .

Specifically, the display screen 200 in FIG. 7 may represent a portion of the display screen 200 rather than the actual size and size of the display screen 200 ; FIG. 8 shows a front view of the display screen 200 . The display screen 200 may correspond to the display screen 120 in the electronic device 10 described above in FIG. 1 and FIG. 2 , and is applicable to the above-mentioned related description of the display screen 120 , which is not repeated here for brevity.

In addition, the electronic device 20 of the embodiment of the present application is described by taking the display screen 200 including several light-emitting display pixels capable of self-emitting light as an example, and the light-emitting display pixels can be used for displaying images. As shown in FIG. 7 and FIG. 8 , the display screen 200 includes a fingerprint detection area 210 for finger pressing, that is, when the user needs to unlock the electronic device 20 or perform other fingerprint recognition, he only needs to press the finger on the The fingerprint detection area 210 can realize fingerprint input. The fingerprint detection area 210 may correspond to the fingerprint detection area 103 in the electronic device 10 described in FIG. 1 to FIG. 4 , and is applicable to the above related description about the fingerprint detection area 103 . For brevity, it is not repeated here.

In this embodiment of the present application, as shown in FIG. 8 , the display screen 200 includes a plurality of light-emitting display pixels, the display screen 200 includes a fingerprint detection area 210 , and the fingerprint detection area 210 further includes a first light-emitting area 211 and a second light-emitting area In the region 212, the first light-emitting region 211 and the second light-emitting region 212 do not overlap.

It should be understood that a fingerprint identification device 300 is provided below the display screen 200 of the terminal device 20 in the embodiment of the present application, and the fingerprint identification device 300 can be used to receive an optical signal returned by a finger. Specifically, the fingerprint identification device 300 may include: an optical path guiding structure and an optical sensor, and the optical sensor is disposed below the optical path guiding structure.

Specifically, the light path guiding structure is used to: guide the first light signal in the first return light signal to the optical sensor, where the first return light signal is that the light-emitting display pixels in the first light-emitting area 211 do not emit light and the second light-emitting area 211 does not emit light. The light signal returned after the light emitted by the light-emitting display pixels in the light-emitting area 212 illuminates the finger; the optical sensor is used for: receiving the first light signal, the optical sensor includes a first sensing area corresponding to the first light-emitting area, the The first optical signal received by the first sensing area is used for fingerprint anti-counterfeiting authentication.

That is to say, when the light-emitting display pixels in the first light-emitting area 211 in the fingerprint detection area 210 do not emit light, and the light-emitting display pixels in the second light-emitting area 212 emit light, the first return light signal is generated after the finger is irradiated with light. , a part of the light pattern in the first return light signal is guided by the light path and then transmitted to the optical sensor, and another part of the light pattern in the first return light signal is blocked by the light path guiding structure and cannot be transmitted to the optical sensor. The part of the first returned optical signal that can be transmitted to the optical sensor is referred to as the first optical signal, that is, the first optical signal is guided to the optical sensor after passing through the optical path guiding structure, and the sensing area of the optical sensor includes In the first sensing area corresponding to the area 211, the part of the first optical signal received by the first sensing area can be used for fingerprint anti-counterfeiting authentication.

Specifically, as shown in FIG. 7 , assuming that the finger touching the fingerprint detection area 210 is a real finger, the light emitted by the illuminated second light-emitting area will return after being propagated by the finger, and there can be more transmitted light between the The first sensing area corresponding to the illuminated first light-emitting area is received; however, in the case of a 2D fake fingerprint, as shown in FIG. 9 , the light received by the first sensing area corresponding to the first light-emitting area mainly relies on the fake fingerprint No matter it is under the action of the oblique receiving light path or the vertical receiving light path, no or only a very small amount of light can be received at the position of the first sensing area. That is to say, for the intensity of the light signal received by the first sensing area corresponding to the unlit first light-emitting area 211 , the intensity of the real finger is greater than that of the 2D fake fingerprint, so that the real and fake fingerprints can be distinguished according to this feature.

For example, the electronic device 20 or the fingerprint identification device 300 may include a processor, and the processor may be used for fingerprint anti-counterfeiting authentication. Specifically, the processor can be used to: if the light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, determine that the finger touching the fingerprint detection area 210 is a real finger; The light intensity of the first light signal received by a sensing area is less than the preset value, and it is determined that the finger is a fake finger.

It should be understood that the fingerprint identification device 300 of the embodiment of the present application may correspond to the optical fingerprint identification module 130 in the electronic device 10 described in the above-mentioned FIG. 1 to FIG. 4 , and is applicable to the above related description about the optical fingerprint identification module 130; The optical path guiding structure in the fingerprint identification device 300 may correspond to the optical component 132 in the electronic device 10 described in FIG. 1 to FIG. 4 , and is applicable to the above-mentioned related description about the optical component 132 . For example, it may specifically correspond to The optical path guiding structure in the optical assembly 132 is applicable to the relevant description; the optical sensor in the fingerprint identification device 300 may correspond to the optical fingerprint sensor in the electronic device 10 described in the above-mentioned FIG. 1 to FIG. 4 , for example, the fingerprint identification device The optical sensor in 300 may be the light detection part 134 in the electronic device 10 described above, which is applicable to the above related description about the light detection part 134 , and is not repeated here for brevity.

Since the optical path guiding structure in the embodiments of the present application can be used to receive vertical light signals and/or oblique light signals, the relative positions between the position of the fingerprint detection area 210 and the position of the sensing area of the fingerprint identification device 300 and the two The size of the area may exist in a variety of situations due to different optical paths. For example, if the optical path guiding structure only receives vertical light signals, the fingerprint detection area 210 may be located directly above the sensing area of the fingerprint identification device 300, and the two areas may be equal; for another example, if the optical path guiding structure can receive multiple different directions the oblique light, then the fingerprint detection area 210 may be located obliquely above the sensing area of the fingerprint identification device 300, and the areas of the two may not be equal. In addition, since the relative position between the fingerprint detection area 210 and the position of the sensing area of the fingerprint identification device 300 and the size of the two areas are not fixed, the first light-emitting area in the fingerprint detection area 210 and the fingerprint identification device 300 are not fixed. The relative positions and areas of the first sensing regions of the optical sensors may also be different, which are not limited in the comparison of the embodiments of the present application.

Optionally, the shape of the fingerprint detection area 210 in this embodiment of the present application may be set according to practical applications, and may be set to any regular or irregular shape. For example, FIG. 8 takes the fingerprint detection area 210 as a circle as an example; or, as shown in FIG. 10 , the fingerprint detection area 210 may also be in other shapes, such as the square shown in the first row in FIG. 10 .

Similarly, the first light-emitting area 211 and the second light-emitting area 212 in the embodiments of the present application may also be set to the same or different arbitrary shapes. Specifically, a reasonable design of the shape of the first light-emitting area 211 can ensure that strong transmitted light of the real finger is extracted in the corresponding first sensing area, while the reflected light signal of the 2D fake fingerprint here is weak and there is no transmission. Light, which forms the difference between true and false. Any spot shape that can extract this difference can realize true and false distinction. For example, considering performance and aesthetics in all aspects, assuming that the fingerprint detection area 210 is circular, the shape of the first light-emitting area 211 as shown in FIG. 8 is better. For another example, the black part in FIG. 10 represents the first light-emitting area 211, wherein, as shown in the four figures in the first two rows in FIG. 10 and FIG. 8 , the first light-emitting area 211 can be set as a single connected area; for another example, As shown in the two figures in the last row in FIG. 10 , the first light-emitting area 211 may also be configured to include multiple disconnected areas, for example, multiple strip-shaped areas or multiple ring-shaped areas as shown in FIG. 10 .

For example, in FIG. 8 , the first light-emitting area 211 is circular and the second light-emitting area 212 is annular as an example. For another example, in the fingerprint detection area shown in FIG. 10 , the black part in each figure in FIG. 10 represents the first light-emitting area 211 , and the first light-emitting area 211 may also be circular, square or other shapes. Correspondingly, the first light-emitting area 211 The second light-emitting area 212 is the other part of the fingerprint detection area except the first light-emitting area 211 .

Optionally, the relative position of the first light-emitting area 211 in the fingerprint detection area 210 may be set according to practical applications, and may be set at any position in the fingerprint detection area 210 . For example, as shown in FIG. 8 and FIG. 10 , the first light-emitting area 211 may be located in the central area of the fingerprint detection area 210; or, the first light-emitting area 211 may also be located at any position on the edge of the fingerprint detection area 210; or, The first area 211 may also be distributed symmetrically with respect to the center point of the fingerprint detection area 211 , which is not limited in this embodiment of the present application.

Optionally, the sizes of the areas of the first light-emitting region 211 and the second light-emitting region 212 in the embodiments of the present application may be set according to practical applications. For example, the area of the second light emitting region 212 may be set to be greater than or equal to the area of the first light emitting region 211 . For another example, the area of the first light-emitting region 211 may also be set to be smaller than or equal to the field of view area of the optical sensor, and the embodiment of the present application is not limited thereto.

Optionally, since light sources of different colors all have a transmission phenomenon in the real finger, when fingerprint identification or fingerprint anti-counterfeiting authentication is performed, the light-emitting display pixels of the second light-emitting area 212 emit light, and the color of the light can be determined according to practical applications. The setting, for example, can be set to a solid color or a gradient color. Considering that the white light source is R/G/B three-color composite light, under the superposition of three-color light, the distinction between true and false is greater, so the color of the light is preferably white. For example, as shown in the left figure of Figure 11, you can set It is gradient white; or as shown in the right image of Figure 11, it can also be set to pure white. In addition to white light, light sources of other colors can also obtain the difference between the transmitted light components of a real finger and a 2D fake fingerprint, but the difference between true and false is only large or small. The color of the light illuminating the finger may be any of the following colors: pure red, pure green, pure cyan, pure white, gradient green, gradient cyan, and gradient white.

In this embodiment of the present application, the fingerprint identification device 300 can perform fingerprint anti-counterfeiting authentication under the action of the first light-emitting area 211 and the second light-emitting area 212 . In addition, the fingerprint identification device 300 can also be used for fingerprint identification.

Optionally, as a first embodiment, the optical sensor in the fingerprint identification device 300 may further include a second sensing area corresponding to the second light-emitting area 212, and the first light received by the second sensing area The signal is used to fingerprint the finger. That is to say, fingerprint identification and fingerprint anti-counterfeiting authentication can be realized by using one fingerprint collection process. For the fingerprint detection area, it can be divided into two parts, one part is the first light-emitting area that does not emit light, and the corresponding first light-emitting area is used. The light signal collected by the sensing area is used for fingerprint anti-counterfeiting, and the other part is the second light-emitting area that emits light, and the light signal collected by the corresponding second sensing area is used for fingerprint imaging and fingerprint matching.

For example, as shown in FIG. 12 , assuming that the fingerprint detection area 210 is circular, the fingerprint detection area 210 includes the first light-emitting area 211 , that is, as shown in the black area B in FIG. 12 ; in addition, the fingerprint detection area 210 includes The second light-emitting area 212, the second light-emitting area 212 may be all or part of other areas in the fingerprint detection area 210 except the first light-emitting area 211, for example, the second light-emitting area 212 may be white as shown in FIG. 12 Area A or area A plus area C may also be shown, wherein area A and area C may emit the same or different colors of light, and area B does not emit light. The light signal collected by the first sensing area corresponding to the first light-emitting area 211 (ie, area B) is used for anti-counterfeiting of fingerprints; the second sensing area corresponding to the second light-emitting area 212 (ie, area A or area A+C) The optical signal collected in the measurement area is used for fingerprint identification.

It should be understood that, according to the above description, the area, position and shape of the first light-emitting region 211 can be arbitrarily set according to practical applications. For example, when considering fingerprint recognition, fingerprint imaging is required, that is, to obtain a sufficiently large and effective fingerprint image, so the area of the second light-emitting region is usually set to be larger than that of the first light-emitting region. In addition, in order to ensure smooth fingerprint recognition, the first light-emitting area is usually set at an edge position of the fingerprint detection area, but the embodiment of the present application is not limited to this.

Optionally, as a second embodiment, the optical path guiding structure in the fingerprint identification device 300 is further configured to: guide the second optical signal in the second returning optical signal to the optical sensor, where the second returning optical signal is The light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and irradiate the light signal returned by the finger; the optical sensor in the fingerprint identification device 300 is also used for: receiving the second light signal, the second light signal The light signal is used to fingerprint the finger. That is to say, at least two fingerprint collection processes are used to realize fingerprint identification and fingerprint anti-counterfeiting authentication, wherein at least one fingerprint collection realizes fingerprint identification, and at least one fingerprint collection realizes fingerprint anti-counterfeiting authentication.

For example, as shown in FIG. 13 , it is still assumed that the fingerprint detection area 210 is a circular area, and the fingerprint identification device 300 needs to perform two collections, one for fingerprint identification, and one for fingerprint anti-counterfeiting authentication. The order of execution of the two can be arbitrarily set. . For the process of fingerprint anti-counterfeiting authentication, as shown in the left figure of FIG. 13 , the first light-emitting area 211 in the fingerprint detection area 210 does not emit light, and the second light-emitting area 212 emits light, so as to obtain the first light signal; The first optical signal received in the detection area can be used for fingerprint anti-counterfeiting. For the process of fingerprint identification and authentication, as shown in the right figure of FIG. 13 , the fingerprint detection area 210 emits light, that is, both the first light-emitting area 211 and the second light-emitting area 212 in the fingerprint detection area 210 emit light, so as to obtain the second light signal, The fingerprint identification device 300 performs fingerprint identification according to the second optical signal.

Optionally, FIG. 13 is only an example, wherein the right figure in FIG. 13 represents possible lighting modes in the fingerprint identification process, that is, for the fingerprint detection area 210 of the fingerprint identification process shown in the right figure. For example, other patterns of lighting may be used, that is, the fingerprint identification process in the right picture of Figure 13 may also use partial lighting; or, multiple lighting methods may be used, corresponding to multiple acquisitions. Fingerprint image to implement the fingerprint recognition process. In addition, in order to improve the security level of the fingerprint anti-counterfeiting process, fingerprint anti-counterfeiting authentication can also be added during the fingerprint identification process, that is, the fingerprint anti-counterfeiting authentication process can be added to the fingerprint identification process in the right picture of Figure 13. In the anti-counterfeiting process, at least two anti-counterfeiting authentications can be performed to improve the security level. For example, fingerprint anti-counterfeiting authentication and fingerprint identification may be performed in the manner shown in FIG. 12 , and fingerprint anti-counterfeiting authentication may be performed again in the manner shown in the left side of FIG. 13 , but the embodiment of the present application is not limited to this.

In addition, according to the above description, the area, position and shape of the fingerprint detection area 210 and the first light-emitting area 211 shown in the left figure can also be set according to practical applications. For example, considering that the first optical signal may not be used for Fingerprint identification does not require obtaining fingerprint imaging, so the area of the first light-emitting region 211 may be set smaller than the area of the field of view of the fingerprint identification device 300 , but the embodiment of the present application is not limited to this.

It should be understood that the above-mentioned first embodiment only needs to collect a fingerprint image once. Compared with the second embodiment, the fingerprint identification and anti-counterfeiting process is faster and simpler. Reasonably set the relationship between the first light-emitting area 211 and the second light-emitting area 212 in the fingerprint detection area 210 to ensure the accuracy and precision of fingerprint identification and fingerprint anti-counterfeiting; and in the second embodiment, it is necessary to perform fingerprinting at least twice Collecting to realize the fingerprint identification process and fingerprint anti-counterfeiting process can ensure that the two processes are more accurate and have no or little influence on each other. The location and area of the first light-emitting area 211 in the fingerprint detection area 210 are more flexible.

It should be understood that in the embodiments of the present application, the fingerprint identification device 300 uses the self-luminous display pixels of the display screen 120 as the light source as an example, that is, the first light-emitting area 211 and the second light-emitting area 212 included in the fingerprint detection area 210 include light-emitting display pixels. In addition to the light source, the fingerprint identification device 300 may also use other light sources, for example, an external light source as the excitation light source for fingerprint detection. Specifically, for any light source, the light signal for fingerprint detection emitted by the light source forms a corresponding light spot on the display screen 200, and the light spot can correspond to the fingerprint detection area 210 in this embodiment of the present application, which is suitable for the above-mentioned fingerprint detection. For the description of the area 210, for example, when the first light-emitting area 211 in the fingerprint detection area 210 does not emit light, it means that the corresponding position in the light spot does not emit light. For brevity, it is not listed here.

Therefore, in the fingerprint identification device and the electronic device of the embodiments of the present application, a part of the non-luminous area is set in the fingerprint detection area, and the real finger will have transmitted light in this part, while the 2D fake fingerprint has no transmitted light, so according to the fingerprint identification device and the The light intensity of the light signal received by the sensing area corresponding to the non-light-emitting area can identify real fingers and 2D fake fingerprints, that is, the difference in light intensity can be used to better defend against 2D fake fingerprint attacks, which can further ensure the security of optical fingerprint identification. sex.

FIG. 14 shows a schematic flowchart of a fingerprint anti-counterfeiting method 400 according to an embodiment of the present application. It should be understood that the method 400 may be performed by an electronic device having a display screen, for example, the electronic device may be the above-mentioned electronic device 10 or 20, for example, the electronic device 10 or 20 may include a processor or a processing unit; The fingerprint identification device 300 may include a processor or a processing unit for performing the method 400 .

As shown in Figure 14, the method 400 includes:

S410: Acquire a first light signal of a finger touching a fingerprint detection area of the display screen, where the fingerprint detection area includes a first light-emitting area and a second light-emitting area, a fingerprint identification device is provided below the display screen, and the fingerprint identification device includes an optical path A guiding structure and an optical sensor, the first optical signal is the optical signal guided into the optical sensor through the optical path guiding structure in the first returning optical signal, and the first returning optical signal is the light-emitting display pixel in the first light-emitting area an optical signal returned after the finger is not illuminated and the light emitted by the light-emitting display pixels in the second light-emitting area illuminates the finger, the optical sensor includes a first sensing area corresponding to the first light-emitting area;

S420, perform fingerprint anti-counterfeiting authentication on the finger according to the first optical signal received in the first sensing area.

Optionally, as an embodiment, performing fingerprint anti-counterfeiting authentication on the finger according to the first optical signal received in the first sensing area includes: if the first optical signal received in the first sensing area If the light intensity of the signal is greater than or equal to the preset value, the finger is determined to be a real finger; if the light intensity of the first optical signal received by the first sensing area is less than the preset value, the finger is determined to be a fake finger.

Optionally, as an embodiment, the optical sensor includes a second sensing area corresponding to the second light-emitting area, and the method 400 further includes: according to the first light signal received by the second sensing area, The finger is fingerprinted.

Optionally, as an embodiment, the method 400 further includes: acquiring a second light signal of the finger, where the second light signal is light from the second return light signal that is guided into the optical sensor after passing through the light path guiding structure The second return light signal is the light signal returned after the light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and illuminate the finger; according to the second light signal received by the optical sensor, the The finger is fingerprinted.

Therefore, the fingerprint anti-counterfeiting method of the embodiment of the present application is applied to an electronic device including a fingerprint identification device under the screen. The electronic device sets a part of the non-luminous area in the fingerprint detection area, and the real finger will have transmitted light in this part, while the 2D The fake fingerprint has no transmitted light, so according to the light intensity of the light signal received by the sensing area corresponding to the non-light-emitting area in the fingerprint identification device, the real finger and the 2D fake fingerprint can be identified, that is, the difference in light intensity can be used for better defense. The attack of 2D fake fingerprints can further ensure the security of optical fingerprint identification.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. 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. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (24)

1. A fingerprint identification device, characterized in that, it is arranged below a display screen of an electronic device, the display screen includes a fingerprint detection area, and the fingerprint detection area includes a first light-emitting area and a second light-emitting area, and the fingerprint identification The device includes: An optical path guiding structure for guiding a first optical signal in the first return optical signal to an optical sensor, where the first return optical signal is that the light-emitting display pixels in the first light-emitting area do not emit light and the second light-emitting area emits light The light signal returned after the light emitted by the light-emitting display pixels in the area irradiates the finger; an optical sensor, located under the optical path guide structure, for receiving the first light signal, the optical sensor includes a first sensing area corresponding to the first light-emitting area, and the first sensing area receives the first light signal The obtained first optical signal is used for fingerprint anti-counterfeiting authentication. 2 . The fingerprint identification device according to claim 1 , wherein the optical sensor comprises a second sensing area corresponding to the second light-emitting area, and the second sensing area receives the first An optical signal is used for fingerprint identification of the finger. 3. The fingerprint identification device according to claim 1, wherein the optical path guiding structure is also used for: Guide the second light signal in the second return light signal to the optical sensor, the second return light signal is that the light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and illuminate the finger The optical signal returned after; The optical sensor is also used to: The second optical signal is received, and the second optical signal is used for fingerprint identification of the finger. 4 . The fingerprint identification device according to claim 1 , wherein the area of the second light-emitting region is larger than that of the first light-emitting region. 5 . 5 . The fingerprint identification device according to claim 1 , wherein the area of the first light-emitting region is smaller than the field of view area of the optical sensor. 6 . 6 . The fingerprint identification device according to claim 1 , wherein the first light-emitting area is located in a central area or an edge area of the fingerprint detection area. 7 . 7 . The fingerprint identification device according to claim 1 , wherein the first area is distributed symmetrically with respect to the center point of the fingerprint detection area. 8 . 8 . The fingerprint identification device according to claim 1 , wherein the first light-emitting area is a single-connected area. 9 . 9 . The fingerprint identification device according to claim 8 , wherein the first light-emitting area is a square or a circle. 10 . 10. The fingerprint identification device according to any one of claims 1 to 7, wherein the first light-emitting area comprises a plurality of disconnected areas. 11 . The fingerprint identification device according to claim 10 , wherein the first light-emitting area comprises a plurality of strip-shaped areas or a plurality of ring-shaped areas. 12 . 12. The fingerprint identification device according to any one of claims 1 to 11, wherein the color of the light emitted by the light-emitting display pixels of the second light-emitting area to illuminate the finger is any of the following colors One: pure red, pure green, pure cyan, pure white, gradient green, gradient cyan and gradient white. 13. The fingerprint identification device according to any one of claims 1 to 12, wherein the optical path guiding structure comprises an optical lens; or, The optical path guiding structure includes an optical collimator having a plurality of collimation units or micro-hole arrays, and the optical collimator is used to transmit the first optical signal through the plurality of collimation units or micro-hole arrays respectively. to the corresponding optical sensing unit in the sensing array of the optical sensor; or, The optical path guiding structure includes a microlens array with a plurality of microlenses and a light blocking layer with a plurality of microholes, and the microlens array is used for focusing the first optical signal through the plurality of microlenses respectively to The corresponding micro-holes of the light blocking layer are transmitted to the corresponding optical sensing units in the sensing array of the optical sensor through the micro-holes. 14 . The fingerprint identification device according to claim 13 , wherein when the optical path guiding structure comprises a microlens array with a plurality of microlenses and a light blocking layer with a plurality of microholes, 14 . The optical sensor is configured to receive light signals in multiple directions, and the light signals in the multiple directions include light signals perpendicular to the display screen and/or light signals inclined relative to the display screen. 15. The fingerprint identification device according to any one of claims 1 to 14, wherein the fingerprint identification device further comprises: The processor is configured to determine whether the finger is a real finger according to the light intensity of the first light signal received by the first sensing area. 16. The fingerprint identification device according to claim 15, wherein, If the light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, the processor is configured to determine that the finger is a real finger; If the light intensity of the first optical signal received by the first sensing area is less than the preset value, the processor is configured to determine that the finger is a fake finger. 17. An electronic device, characterized in that, comprising: the fingerprint identification device, a display screen, and a processor according to any one of claims 1 to 14, The display screen is used for displaying images, the display screen includes a fingerprint detection area, and the fingerprint detection area includes a first light-emitting area and a second light-emitting area; The processor is configured to: perform fingerprint anti-counterfeiting authentication on the finger according to the first optical signal received by the first sensing area included in the optical sensor. 18. The electronic device according to claim 17, wherein, If the light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, the processor is configured to determine that the finger is a real finger; If the light intensity of the first optical signal received by the first sensing area is less than the preset value, the processor is configured to determine that the finger is a fake finger. 19. The electronic device according to claim 17 or 18, wherein the optical sensor comprises a second sensing area corresponding to the second light emitting area, The processor is also used to: Fingerprint recognition is performed on the finger according to the first optical signal received by the second sensing area. 20. The electronic device according to claim 17 or 18, wherein the processor is further configured to: Fingerprint recognition is performed on the finger according to the second optical signal received by the optical sensor, wherein the second optical signal is the second optical signal which is guided to the optical sensor through the optical path guiding structure in the second return optical signal. The light signal, the second return light signal is the light signal returned after the light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and illuminate the finger. 21. A method for fingerprint anti-counterfeiting, comprising: Obtain the first light signal of the finger touching the fingerprint detection area of the display screen, the fingerprint detection area includes a first light-emitting area and a second light-emitting area, and a fingerprint identification device is provided below the display screen, and the fingerprint identification device includes An optical path guiding structure and an optical sensor, the first optical signal is an optical signal guided into the optical sensor through the optical path guiding structure in the first returning optical signal, and the first returning optical signal is the first light emission The light-emitting display pixels in the area do not emit light and the light signal returned after the light emitted by the light-emitting display pixels in the second light-emitting area illuminates the finger, the optical sensor includes a first sensing area corresponding to the first light-emitting area ; According to the first optical signal received by the first sensing area, fingerprint anti-counterfeiting authentication is performed on the finger. 22 . The method according to claim 21 , wherein, performing fingerprint anti-counterfeiting authentication on the finger according to the first optical signal received in the first sensing area, comprising: 22 . If the light intensity of the first optical signal received by the first sensing area is greater than or equal to a preset value, determining that the finger is a real finger; If the light intensity of the first optical signal received by the first sensing area is less than the preset value, it is determined that the finger is a fake finger. 23. The method according to claim 21 or 22, wherein the optical sensor comprises a second sensing area corresponding to the second light emitting area, The method also includes: Fingerprint recognition is performed on the finger according to the first optical signal received by the second sensing area. 24. The method according to claim 21 or 22, wherein the method further comprises: Obtain the second optical signal of the finger, the second optical signal is the optical signal of the second returning optical signal that is guided to the optical sensor after passing through the optical path guiding structure, and the second returning optical signal is the The light-emitting display pixels in the first light-emitting area and the second light-emitting area both emit light and return light signals after irradiating the finger; Fingerprint recognition is performed on the finger according to the second optical signal received by the optical sensor.

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