CN110705517A

CN110705517A - Method for fingerprint identification and electronic equipment

Info

Publication number: CN110705517A
Application number: CN201910996275.8A
Authority: CN
Inventors: 侯仕东; 李厚辰
Original assignee: Shenzhen Huiding Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-10-18
Filing date: 2019-10-18
Publication date: 2020-01-17
Anticipated expiration: 2039-10-18
Also published as: CN110705517B

Abstract

The embodiment of the application discloses a method for fingerprint identification and electronic equipment, which can reduce background images in fingerprint images and improve the accuracy of the obtained effective fingerprint images. The method is applied to an electronic device with a screen and at least one fingerprint sensor, wherein a fingerprint acquisition area of the at least one fingerprint sensor is positioned in a display area of the screen, and the method comprises the following steps: collecting target pressing information that a finger presses the screen while at least some of the at least one fingerprint sensor collects a fingerprint image of the finger; and determining an effective fingerprint image in the fingerprint images according to the target pressing information, wherein the effective fingerprint image is used for fingerprint identification.

Description

Method for fingerprint identification and electronic equipment

Technical Field

The embodiment of the application relates to the field of fingerprint identification, and more particularly to a method and an electronic device for fingerprint identification.

Background

With the rapid development of the mobile phone industry, the fingerprint identification technology is more and more emphasized by people, and the practicability of the under-screen fingerprint identification technology becomes a requirement of the public. The most applied of the technology of fingerprint identification under the screen is the technology of optical fingerprint identification under the screen, the technology of optical fingerprint identification under the screen can adopt the light that the screen sent as the light source, the light that the screen sent can carry the fingerprint information of finger after shining the finger above the screen, fingerprint sensor can generate the fingerprint image of finger according to the fingerprint information of finger to carry out fingerprint identification.

However, the fingerprint image generated by the fingerprint sensor includes a background image in addition to an effective fingerprint image representing the fingerprint characteristics of the finger, and the presence of the background image affects fingerprint recognition, so how to reduce the background image in the fingerprint image becomes a problem to be solved urgently.

Disclosure of Invention

The embodiment of the application provides a method for fingerprint identification and electronic equipment, which can reduce background images in fingerprint images and improve the accuracy of the obtained effective fingerprint images.

In a first aspect, a method for fingerprint identification is provided, the method being applied in an electronic device having a screen and at least one fingerprint sensor, a fingerprint acquisition area of the at least one fingerprint sensor being located in a display area of the screen, the method comprising: collecting target pressing information that a finger presses the screen while at least some of the at least one fingerprint sensor collects a fingerprint image of the finger; and determining an effective fingerprint image in the fingerprint images according to the target pressing information, wherein the effective fingerprint image is used for fingerprint identification.

According to the technical scheme, the target pressing information and the fingerprint image are collected simultaneously, accurate pressing information of the finger when the fingerprint image is collected can be obtained, and therefore the accuracy of the effective fingerprint image determined according to the pressing information can be improved.

In some possible implementations, the time window for acquiring the fingerprint image coincides with the time window for acquiring the target compression information.

In some possible implementations, the target compression information includes at least one of: pressing coordinates, pressing area, contact surface long axis, contact surface short axis and pressing pressure.

In some possible implementations, before at least part of the at least one fingerprint sensor captures a fingerprint image of a finger, the method further comprises: acquiring initial pressing information when the finger presses the fingerprint acquisition area; and controlling light-emitting pixels of the screen to emit light according to the initial pressing information, so that the light emitted by the light-emitting pixels can illuminate the contact area of the finger and the screen, and the light emitted by the light-emitting pixels of the screen is used for the at least part of fingerprint sensor to acquire the fingerprint image.

In some possible implementations, the fingerprint collection area is formed by splicing sensing areas of the at least one fingerprint sensor, and the light-emitting pixels are light-emitting pixels corresponding to the sensing areas of the at least part of fingerprint sensors.

In some possible implementations, the initial pressing information satisfies a preset condition, where the preset condition includes that a pressing area of the finger reaches a first threshold and/or a pressing pressure of the finger reaches a second threshold.

In some possible implementations, the initial compression information includes at least one of: pressing coordinates, pressing area, contact surface long axis, contact surface short axis and pressing pressure.

In some possible implementations, the method further includes: determining the at least partial fingerprint sensor for acquiring the fingerprint image of the finger according to the initial pressing information of the finger, wherein the at least partial fingerprint sensor is the fingerprint sensor corresponding to the contact area in the at least one fingerprint sensor.

In some possible implementations, the method further includes: determining whether the target compression information is changed from the initial compression information; the determining, according to the target pressing information, a valid fingerprint image of the fingerprint images includes: and under the condition that the target pressing information is changed relative to the initial pressing information, determining the effective fingerprint image according to the target pressing information.

In some possible implementations, the at least one fingerprint sensor includes two or more fingerprint sensors.

The method of the embodiment of the application is mainly applied to a large-area fingerprint identification scheme.

In some possible implementations, the screen is an organic light emitting diode, OLED, screen.

In some possible implementations, the at least one fingerprint sensor includes a sensing array having a plurality of optical sensing units, the sensing array being configured to receive light signals returned by the finger passing through the optical path directing structure and to generate a fingerprint image of the finger from the returned light signals.

In a second aspect, an electronic device is provided, comprising: a screen; at least one fingerprint sensor, a fingerprint acquisition area of the at least one fingerprint sensor being located within a display area of the screen; a processor for performing the method of any one of the first aspect.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device used in an embodiment of the present application.

Fig. 2 is another schematic structural diagram of an electronic device used in an embodiment of the present application.

Fig. 3 is a schematic diagram of a method for fingerprint identification according to an embodiment of the present application.

Fig. 4 is a schematic flowchart of a fingerprint identification process provided in an embodiment of the present application.

Fig. 5 is a schematic diagram of another method for fingerprint identification according to an embodiment of the present disclosure.

Fig. 6 is a schematic diagram of a fingerprint image according to an embodiment of the present application.

Fig. 7(a) and 7(b) are schematic views of screens of the embodiment of the present application.

Fig. 8(a) and 8(b) are schematic views of the pressing region of the embodiment of the present application.

FIG. 9 is a schematic diagram of determining a polishing area according to an embodiment of the present disclosure.

FIG. 10 is a schematic diagram of determining a polishing area according to an embodiment of the present disclosure.

FIG. 11 is a schematic diagram of determining a polishing area according to an embodiment of the present disclosure.

Fig. 12 is a schematic diagram of a fingerprint processing area according to an embodiment of the present application.

Fig. 13 is a schematic diagram of a fingerprint processing area according to an embodiment of the present application.

Fig. 14 is a schematic diagram of a fingerprint processing area according to an embodiment of the present application.

Fig. 15 is a schematic flow chart of another fingerprint identification process provided in the embodiment of the present application.

Fig. 16 is a schematic block diagram of an electronic device provided in an embodiment of the present application.

Detailed Description

The technical solution of the embodiment of the present application may perform other biometric identification besides fingerprint identification, for example, any one or more of iris, retina, gene, voice, face, palm geometry, vein, gait, and handwriting, which is not limited in the embodiment of the present application.

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

More specifically, in the above electronic device, the biometric recognition means may be provided in a partial area or an entire area below the display screen, thereby forming an under-screen (under-display) optical biometric recognition system. The technical solution in the embodiments of the present application will be described below with reference to the drawings, taking a biometric apparatus as a fingerprint identification apparatus as an example.

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

It should be understood that the thickness, length, width, and the like of the various components in the embodiments of the present application shown in the drawings, and the overall thickness, length, width, and the like of the underscreen biometric device are merely illustrative and should not limit the present application in any way.

Fig. 1 and 2 are schematic structural diagrams of an electronic device to which the underscreen fingerprint recognition apparatus can be applied. Fig. 1 is a schematic front view of an electronic device 100, and fig. 2 is a schematic partial sectional view of the electronic device 100 shown in fig. 1 along a-a'.

As shown in fig. 2, the electronic device 100 may include a display screen 120 and a fingerprint identification module 140, wherein the display screen 120 has a display area 102, and the fingerprint identification module 140 is disposed below the display screen 120.

The display 120 may be a self-luminous display employing display units having self-luminous properties as display pixels. For example, the display screen 120 may be an Organic Light-emitting diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In other alternative embodiments, the Display screen 120 may also be a Liquid Crystal Display (LCD) or other passive light emitting Display screens, which is not limited in this embodiment of the present application.

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

Fingerprint identification module 140 can specifically be optical fingerprint identification module, its mainly used gathers user's fingerprint information (for example fingerprint image information). In this application embodiment, fingerprint identification module 140 can set up at least the subregion of display screen 120 below, thereby makes fingerprint collection area (or induction zone) 130 of fingerprint identification module 140 is located at least partially the display area 102 of display screen 120, and here, the area of fingerprint collection area 130 can be different with fingerprint identification module 140's area, and light path design such as the light path design through lens formation of image, the folding light path design of reflective or other light converge or light designs such as reflection can make the area of fingerprint collection area 130 of fingerprint identification module 140 is greater than fingerprint identification module 140's area. In other alternative implementations, the fingerprint collection area 130 of the fingerprint recognition module 140 may also be designed to be consistent with the area of the fingerprint recognition module 140 if light path guidance is performed in a light collimation manner, for example.

As an embodiment, the fingerprint identification module 140 may specifically include a plurality of optical fingerprint sensors 142 (hereinafter also referred to as sensor chips) having an optical sensing array; the plurality of optical fingerprint sensors 142 may be disposed side-by-side below the display screen 120. Each optical sensing array 142 includes a plurality of optical sensing units, and the area where the optical sensing array is located corresponds to the sensing area 103 of the optical fingerprint sensor where the optical sensing array is located, and the sensing areas of the optical fingerprint sensors jointly form the fingerprint collecting area 130 of the fingerprint identification module 140. That is, the fingerprint collection area 130 of the fingerprint identification module 140 may include a plurality of sub-areas, each of which corresponds to one of the sensing areas of the optical fingerprint sensor or the optical sensing array. As shown in fig. 1, the fingerprint collection area 130 is located in the display area 102 of the display screen 120, and due to the adoption of the mode that a plurality of optical fingerprint sensors are arranged side by side, the fingerprint collection area 130 of the fingerprint identification module 140 can be extended to the main area of the lower half part of the display area 102, namely, the area that a finger presses conventionally, so as to realize the blind-touch type fingerprint input operation. In other alternative embodiments, when the number of optical fingerprint sensors is sufficient, the fingerprint acquisition area 130 may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen fingerprint detection. Therefore, when the user needs to unlock or otherwise verify the fingerprint of the electronic device 100, the user only needs to press a finger on the fingerprint collection area 130 of the display screen 120, so as to realize the fingerprint input operation. Since fingerprint collection and detection can be implemented inside the display area 102 of the display screen 120, the electronic device 100 with the above structure does not need a special reserved space on the front surface thereof to set a fingerprint key (such as a Home key), and thus a full-screen scheme can be adopted. Thus, the display area 102 of the display screen 120 may extend substantially across the entire front face of the electronic device 100.

In a specific embodiment, the optical fingerprint sensors 142 of the fingerprint identification module 140 may be sensor chips that are independently packaged, or may be packaged in the same chip package after being manufactured into a plurality of chips (Die), or may be manufactured in different areas of the same chip (Die) through a semiconductor process. On the other hand, the optical fingerprint sensor 142 may include, in addition to the optical sensing array as described above, a reading circuit and/or other auxiliary circuits electrically connected to the sensing array. As an alternative implementation, as shown in fig. 2, an optical path modulator 144 may be further disposed above the optical fingerprint sensor 142. Taking the optical path modulator 144 as an example, it may be attached above the sensing array of the optical fingerprint sensor 142 as an independent optical component, or may be integrated inside a chip of the optical fingerprint sensor 142 through a semiconductor process, so as to implement the ultra-thin fingerprint identification module 140. Specifically, the optical path modulator 144 may be an optical collimator that uses a through hole array with a high aspect ratio, and is mainly used to collimate, modulate, and image the fingerprint detection light that propagates downward, so as to guide the reflected light reflected from the surface of the finger to the sensing array for optical detection to obtain fingerprint image information.

Optionally, with a plurality of optics fingerprint sensor 142 of fingerprint identification module 140 are corresponding, light path modulator 144 can be a plurality of, and each light path modulator 144 corresponds an optics fingerprint sensor respectively to laminate respectively and set up in its corresponding optics fingerprint sensor 142's top. Alternatively, the plurality of optical fingerprint sensors 142 may share a single optical path modulator 144, i.e., the optical path modulator 144 has a large enough area to cover the sensing array of the plurality of optical fingerprint sensors 142. In addition, other optical elements, such as a Filter (Filter) or other optical films, may be disposed between the optical path modulator 144 and the optical fingerprint sensor 142 or between the display screen 120 and the optical path modulator 144, and are mainly used to isolate the influence of external interference light on the detection of the optical fingerprint. The optical filter may be configured to filter ambient light that penetrates through a finger and enters the image recognition sensor 130 through the display screen 120, and similar to the optical path modulator 144, the optical filter may be respectively disposed on each optical fingerprint sensor 142 to filter interference light, or may also cover the plurality of optical fingerprint sensors 142 with one large-area optical filter.

Alternatively, the optical path modulator 144 may be replaced by an optical Lens (Lens), and a small hole may be formed above the optical Lens through a light shielding material to cooperate with the optical Lens to converge the fingerprint detection light to the optical fingerprint sensor 142 below the optical Lens to realize fingerprint imaging. Similarly, each optical fingerprint sensor 142 may be configured with an optical lens for fingerprint imaging, or the optical fingerprint sensors 142 may also use the same optical lens to achieve light convergence and fingerprint imaging. In other alternative embodiments, each optical fingerprint sensor 142 may even have two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), and two or more optical lenses are configured to cooperate with the two or more sensing arrays to perform optical imaging, so as to reduce the imaging distance and enhance the imaging effect.

The embodiment of the application takes the display screen 120 adopts the OLED display screen as an example, the luminescent layer of the display screen 120 has the array of the OLED display units arranged in an array manner, and the fingerprint identification module 140 can utilize the OLED display screen 120 to be located in the OLED display unit (i.e., the OLED light source) of the fingerprint collection area 130 as the excitation light source for fingerprint detection identification. Of course, it should be understood that in other alternative implementations, the fingerprint identification module 140 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the device for identifying fingerprints under the screen can be applied not only to a self-luminous display screen such as an OLED display screen, but also to a non-self-luminous display screen such as a liquid crystal display screen or other passive luminous display screens. Taking the application to a liquid crystal display screen with a backlight module and a liquid crystal panel as an example, in order to support the fingerprint detection under the screen of the liquid crystal display screen, the pair of the liquid crystal display screen can also comprise an excitation light source for optical fingerprint detection, and the excitation light source can be specifically an infrared light source or a light source of non-visible light with a specific wavelength. Taking an infrared light source as an example, the infrared light source may be disposed below a backlight module of the liquid crystal display or in an edge area below a protective cover of the electronic device 100, the fingerprint identification module 140 is disposed below the backlight module, and the backlight module is configured to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint sensor of the fingerprint identification module 140 by perforating or other optical designs on film layers such as a diffusion sheet, a brightness enhancement sheet, and a reflection sheet.

Moreover, the optical sensing array of the fingerprint identification module 140 is specifically a photo detector (or called photo detector) array, which includes a plurality of photo detectors distributed in an array, the photo detectors can be used as the optical sensing units, and microlenses can be formed above the photo detectors to improve the imaging effect of the fingerprint image.

When a finger touches, presses or approaches (for convenience of description, collectively referred to as pressing) the fingerprint acquisition area 130, light emitted from the display unit of the fingerprint acquisition area 130 or an additionally configured fingerprint detection excitation light source is reflected on the finger and forms reflected light, wherein the reflected light may carry fingerprint information of the user's finger. For example, after the light is reflected by the fingerprint on the surface of the finger of the user, the reflected light carries the fingerprint information of the user because the reflected light of the ridges and the valleys of the fingerprint is different. The reflected light returns to the display screen 120 and is received by the photodetector array of the fingerprint identification module 140 therebelow and converted into a corresponding electrical signal, i.e., a fingerprint detection signal. The electronic device 100 may obtain the fingerprint information of the user based on the fingerprint detection signal, and may further perform fingerprint matching verification, thereby completing identity verification of the current user so as to determine whether the current user has the right to perform corresponding operations on the electronic device 100.

It should be understood that, in an implementation, the electronic device 100 further includes a protective cover plate 110, the cover plate 110 may be a transparent cover plate, such as 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 100, and a surface of the protective cover plate 110 may be further provided with a protective layer. Therefore, in the embodiment of the present application, the pressing of the display screen 120 by the finger may actually mean that the finger presses the cover plate 110 above the display screen 120 or a surface of a protective layer covering the cover plate 110.

It should also be understood that the protective cover 110 and the display screen 120 may be collectively referred to as a screen of the electronic device 100.

On the other hand, a Circuit board 150, such as a Flexible Printed Circuit (FPC), may be disposed below the fingerprint identification module 140, and the fingerprint identification module 140 may be soldered to the Circuit board 150 through a solder pad, and electrically interconnected with other peripheral circuits or other elements of the electronic device 100 and used for signal transmission through the Circuit board 150. For example, the fingerprint identification module 140 may receive a control signal of a processing unit of the electronic device 100 through the circuit board 150, and may further output the fingerprint detection signal to the processing unit or the control unit of the electronic device 100 through the circuit board 150.

The screen in the embodiment of the present application may have a display function and a touch function, and the screen may also be referred to as a display screen or a touch screen.

During fingerprint identification or fingerprint registration, the processor may control the display screen to display an indication map in the fingerprint acquisition area to guide a user to press on the position of the indication map. After the finger is pressed, the touch screen can detect initial pressing information of the finger, such as a pressing position, a pressing area, a long axis of the contact surface, a short axis of the contact surface, and/or the magnitude of the pressing force of the finger. Because the touch screen is sensitive to the pressing of a finger, and the touch data is reported when the finger just contacts the screen, fingerprint application software usually sets a certain pressing pressure or area card control, and the fingerprint sensor can collect fingerprint data only after the pressing pressure and the pressing area reach a certain threshold value. However, due to individual differences of users, some fingers are thick and some fingers are thin, the ideal effect is difficult to achieve by pressing the area threshold value, and some card controls can be generally relaxed.

After the pressing pressure or the pressing area of the finger reaches a certain threshold, the fingerprint sensor may generate a fingerprint image of the finger according to the optical signal returned by the finger. However, the fingerprint sensor receives, in addition to the light signal returned by the finger, background light returned without being reflected by the finger, such as a return light signal of an area not pressed by the finger, and the light signal affects fingerprint recognition. Especially, large-area fingerprint identification is more obvious, and the fingerprint identification method is expected to collect full fingerprints as much as possible and reduce background fingerprint images as much as possible.

The embodiment of the application provides a method for fingerprint identification, which can improve effective fingerprint data of an acquired fingerprint image.

As shown in fig. 3, the 300 method can be applied to an electronic device having a screen and at least one fingerprint sensor with a fingerprint acquisition area located in a display area of the screen, that is, the 300 method is mainly applied to off-screen fingerprint recognition. The method shown in fig. 3 may be performed by a screen, a processor, or a fingerprinting device. The method 300 includes steps S310 to S320.

And S310, acquiring pressing information when the finger presses the fingerprint acquisition area.

S320, according to the pressing information, determining effective fingerprint images in the fingerprint images collected by at least part of the fingerprint sensors in the at least one fingerprint sensor, wherein the effective fingerprint images are used for fingerprint identification.

That is to say, in the embodiment of the present application, the image collected by the fingerprint sensor is not directly used for fingerprint identification, but the image collected by the fingerprint sensor is cut according to the pressing information of the finger, for example, a fingerprint image that is not generated by the optical signal returned by the finger can be cut off to obtain an effective fingerprint image, and it is ensured that the effective fingerprint image is generated by the optical signal returned by the finger only.

Specifically, the captured fingerprint image may be clipped according to the pressing coordinates, the pressing area, the long axis of the contact surface, the short axis of the contact surface, and/or the magnitude of the pressing pressure when the finger presses the display screen, so as to obtain the fingerprint data generated by the optical signal really returned by the finger.

As one example, the area of the valid fingerprint image may be equal to or slightly larger than the contact area of the finger with the screen.

For large-area fingerprint identification, the fingerprint acquisition area is formed by splicing the sensing areas of at least one fingerprint sensor. For example, at least one fingerprint sensor includes 4 fingerprint sensors, and every fingerprint sensor corresponds a sensing area on the display screen, and 4 sensing areas that 4 fingerprint sensors correspond form fingerprint collection area. Each fingerprint sensor can receive the light signal returned by the corresponding sensing area.

The above process is described in detail below by taking a self-luminous display as an example.

As shown in fig. 4, in case that the application software initiates fingerprint recognition or fingerprint registration, the display screen may display an indication map in the fingerprint collection area to guide the user to press at the position of the indication map. After the finger pressed the touch-sensitive screen, the touch-sensitive screen can detect the area of pressing of finger, if press the area and not reach the area threshold value of pressing, the touch-sensitive screen continues to detect the area of pressing of finger, if press the area and reach the area threshold value of pressing, the treater can draw touch-sensitive screen information for tailor the fingerprint image who obtains, and control the display screen and press the position at the finger and polish, in order to illuminate the area of contact of finger and display screen. Then fingerprint sensor can carry out fingerprint collection, if only a fingerprint sensor, then this fingerprint sensor of processor control carries out fingerprint collection, if there are a plurality of fingerprint sensors, the processor can be according to the position of pressing of finger, and the fingerprint sensor that corresponds with the position of pressing of finger among the control a plurality of fingerprint sensors carries out fingerprint collection. The processor can determine effective fingerprint data according to the pressing information of the finger, and performs fingerprint registration or fingerprint identification according to the effective fingerprint data, so that the accuracy of the acquired fingerprint image can be improved.

However, in the above process of acquiring an effective fingerprint image, the effective fingerprint image is determined according to the pressing information of the finger before the fingerprint sensor acquires the fingerprint image, but in the process of acquiring the fingerprint image by the fingerprint sensor, the finger is often pressed unstably or the user has a moving finger, so the coordinate and the area pressed by the finger may change at any time, in the process of acquiring the fingerprint image by the fingerprint sensor, the center coordinate and the contact area pressed by the finger may have changed, and if the previous pressing information is further adopted for calculation, the extracted effective image may have a deviation, which affects the accuracy of the effective fingerprint image.

Therefore, the embodiment of the application provides another method for fingerprint identification, which can improve the accuracy of the obtained effective fingerprint image.

As shown in fig. 5, the method may be applied to an electronic device having a screen and at least one fingerprint sensor having a fingerprint acquisition area located in a display area of the screen, that is, the method 500 is mainly applied to off-screen fingerprint recognition. The method shown in fig. 5 may be performed by a screen, a processor, or a fingerprinting device. The method 500 includes steps S510-S520.

S510, collecting target pressing information of pressing the screen by the finger when at least part of the fingerprint sensors in the at least one fingerprint sensor collect fingerprint images of the finger.

S520, determining an effective fingerprint image in the fingerprint image according to the target pressing information, wherein the effective fingerprint image is used for fingerprint identification.

In the embodiment of the application, the time window for collecting the fingerprint image can be overlapped with the time window for collecting the target pressing information. That is to say, when the fingerprint sensor collects a fingerprint image, a touch information collecting thread of the touch screen is newly created, so that a time window for collecting touch information by the touch screen is overlapped with a time window for collecting the fingerprint image by the fingerprint sensor. Therefore, accurate pressing information of the finger when the fingerprint image is collected can be obtained, then the processor can determine the effective fingerprint image according to the pressing information, the accuracy of the effective fingerprint image can be ensured, and the success rate of fingerprint identification is improved.

The target compression information may include, but is not limited to, at least one of the following: pressing coordinates, pressing area, contact surface long axis, contact surface short axis and pressing pressure. The press coordinates may include center coordinates of the press. The magnitude of the pressing pressure may include the magnitude of the pressing pressure at different locations.

The pressing area, the pressing pressure magnitude, the contact surface long axis and the contact surface short axis can assist in determining the pressing area of the finger. For example, the pressing area of the finger may be determined according to the pressing area of the finger. For another example, the pressing area of the finger may be determined according to the magnitude of the pressing pressure of the finger, and if the position where the pressing pressure is not 0 indicates that the finger touches, the position where the pressing pressure is 0 indicates that the finger does not touch. For another example, the contact surface of the finger and the screen is generally elliptical, so that the long axis of the contact surface and the short axis of the contact surface can assist in determining the pressing area according to the real contact surface more accurately.

In the embodiment of the present application, the area of the effective fingerprint image may be equal to or slightly larger than the area of the pressing area. Since the contact surface of the finger with the screen is usually elliptical, the effective fingerprint image may also be elliptical.

The embodiment of the application can also acquire the initial pressing information when the finger presses the fingerprint acquisition area before the fingerprint image of at least part of the fingerprint sensor collects the finger, and according to the initial pressing information, the luminous pixel of the display screen is controlled to emit light, so that the light emitted by the luminous pixel can illuminate the contact area of the finger and the display screen, and the light emitted by the luminous pixel of the screen is used for collecting the fingerprint image of at least part of the fingerprint sensor.

For example, when the application software needs to perform a fingerprint operation, the touch screen may detect a fingerprint pressing operation performed by a finger in the fingerprint collection area, and acquire initial pressing information of the finger. Then can be according to initial press information, control display screen is polished at the assigned position, and at least some fingerprint sensor can be according to the light that the display screen sent, carries out fingerprint identification.

As one example, the area of the lighted area of the display screen may be equal to or greater than the contact area of the finger with the display screen and less than the area of the fingerprint acquisition area. When a finger presses on the screen, the screen can acquire a contact area of the finger with the screen, the contact area is used for determining a lighting area, and the lighting area is used for determining which light-emitting units of the display screen are used as light sources for fingerprint identification, so that light for fingerprint identification is emitted to the finger. The light that sends in this light zone is gathered by the fingerprint sensor among the fingerprint identification device after this finger reflection to can acquire fingerprint data according to the light signal who gathers, and accomplish fingerprint identification based on fingerprint data.

It will be appreciated that during fingerprint recognition the display screen is illuminated in certain illuminated areas and the display screen is not illuminated in other areas for fingerprint recognition, but the display screen may still be illuminated in such other areas for functions such as image output and display. That is, the emitted light in other areas is not used for fingerprint recognition, but is used to perform other functions than fingerprint recognition. The light emitted from the light-emitting region may have different intensity, wavelength, and the like from the light emitted from other regions, for example, the light intensity emitted from the light-emitting region is significantly higher than the light intensity emitted from other regions of the display screen.

The fingerprint collection area may be formed by splicing sensing areas of at least one fingerprint sensor, and the light-emitting pixels may be light-emitting pixels corresponding to the sensing areas of at least some fingerprint sensors. Different fingerprint sensor correspond different induction zone on the display screen, when the finger contacts with certain induction zone, can control the luminous pixel of this induction zone luminous to the finger of illuminating above this induction zone. If the contact area of the finger and the display screen corresponds to a plurality of sensing areas, namely the contact area spans different sensing areas, the processor can control the light-emitting pixels of the plurality of sensing areas to emit light.

In the embodiment of the application, under the condition that the initial pressing information meets the preset condition, at least part of the fingerprint sensors can collect fingerprint data. That is to say, under the condition that the initial pressing information does not satisfy the preset condition, the fingerprint sensor is not started to collect fingerprint data, and the touch screen continues to detect the pressing information of the finger.

The preset condition may for example comprise that the pressing area of the finger reaches a first threshold value and/or that the pressing pressure of the finger reaches a second threshold value.

The initial compression information may include, but is not limited to, at least one of the following: pressing coordinates, pressing area, contact surface long axis, contact surface short axis and pressing pressure.

The fingerprint sensor processing method and device can further determine at least one partial fingerprint sensor used for collecting the fingerprint image of the finger according to the initial pressing information of the finger, wherein the at least partial fingerprint sensor is a fingerprint sensor corresponding to the contact area in at least one fingerprint sensor. That is to say, the fingerprint sensor that the sensing area that the finger did not press corresponds can not work, does not carry out fingerprint data's collection, can save the consumption like this, reaches the purpose of power saving.

Then, a valid fingerprint image may be obtained from the fingerprint image of the finger generated by at least part of the fingerprint sensor and the target press information of the finger. For example, the fingerprint image generated by the fingerprint sensor is square, the effective fingerprint image after cutting is generally oval, and the embodiment of the application can obtain the oval effective fingerprint image according to the target pressing information.

As shown in fig. 6, the fingerprint image collected by the fingerprint sensor is a fingerprint image 600, the fingerprint image includes a valid fingerprint image 610 and a background image 620, and the processor may remove data of the background image 620 according to the target pressing information, and only retain data of the valid fingerprint image 610, and then perform fingerprint identification or fingerprint registration according to the valid fingerprint image 610.

In the embodiment of the present application, the light source for fingerprint identification may include other additional light sources besides the light emitting unit of the display screen in the lighting area, which is not limited herein.

The screen in the embodiment of the present application may also be referred to as a screen assembly, which includes a touch screen and a display screen. The touch screen and the display screen may be placed in an overlapping manner, for example, the touch screen may be attached to the display screen.

The touch screen comprises a plurality of contact points, and the touch screen can determine the pressing operation of a finger according to the signal variation of each contact point in the plurality of contact points, such as the pressing position, the pressing strength and the like. The touch screen may be, for example, a capacitive touch screen, and when a finger presses a fingerprint acquisition area in the screen, the touch screen may determine a pressing area of the finger according to a capacitance variation on each contact point.

The display screen is provided with a luminescent layer, the luminescent layer comprises a plurality of luminescent units, and part of the luminescent units can be used as excitation light sources for fingerprint identification. The display screen may be a self-luminous display screen, such as an OLED display screen, whose light-emitting layer includes a plurality of organic light-emitting diode light sources, wherein the organic light-emitting diode light sources located in the light-emitting area serve as light sources for fingerprint recognition.

Taking the screen shown in fig. 7(a) and 7(b) as an example, fig. 7(a) and 7(b) are top views of a screen including a touch screen and a display screen, wherein the display screen is attached below the touch screen. The screen can sense finger pressing operation and realize other functions of the touch screen and the display screen. Fig. 7(a) shows a fingerprint collection area of a fingerprint recognition device, which is located at a lower portion of a display area of a screen, occupying a large area of the lower portion, and is capable of collecting fingerprint information located within the fingerprint collection area. Fig. 7(b) shows respective touch points on the screen, wherein each small square represents a touch point, when a finger is placed on the fingerprint collection area, the signal value of the touch point touched by the finger changes, and the pressing area of the finger can be determined based on the signal change amount of the touch points on the screen.

Optionally, one or more fingerprint sensor chips may be included in the fingerprint recognition device. When the fingerprint identification device comprises a plurality of fingerprint sensor chips, for example two fingerprint sensor chips, the fingerprint acquisition area comprises the sensing area of the plurality of fingerprint sensors.

The area of the fingerprint acquisition area can be equal to the physical area occupied by the sensing arrays of all the fingerprint sensor chips; alternatively, the area of the fingerprint collection area may be larger than the physical area occupied by the sensing arrays of all fingerprint sensor chips by using, for example, a light path design of lens imaging, a reflective folded light path design, or other light path designs such as light convergence or reflection.

How to obtain the polished area in the embodiment of the present application is described below with reference to fig. 8(a), 8(b), and 9 to 11.

The methods shown in fig. 3 and 5 may be performed by a touch screen, a processor, such as a main processor of a terminal device, or a fingerprint recognition device. In the embodiment of the present application, a touch screen, a processor, a fingerprint identification device, and the like may be used to determine the polishing area, which is not limited herein.

That is, the light-up area may be determined by the touch screen according to a pressing area of the finger performing a fingerprint pressing operation within the fingerprint collection area; alternatively, the polishing area may be determined by the processor from the pressing area; alternatively, the polished area may be determined by the fingerprint recognition device based on the pressed area.

Alternatively, if the method is executed by a touch screen, the touch screen may determine the pressing area according to the signal variation on each contact when the finger presses the fingerprint acquisition area.

For example, when a finger performs a pressing operation in the fingerprint acquisition area, the touch screen determines a pressing area of the finger according to signal variation on each contact point, and reports the pressing area to the processor as a lighting area, and the processor controls the display screen to emit light in the lighting area for fingerprint identification.

Optionally, if the method is executed by a processor, the processor may obtain the pressed area reported by the touch screen.

For example, when a finger performs a pressing operation in the fingerprint acquisition area, the touch screen determines the pressing area of the finger according to the signal variation on each contact point and reports the information of the pressing area to the processor. The processor determines a polishing area according to the information of the pressing area reported by the touch screen, and controls the display screen to emit light in the polishing area for fingerprint identification.

Optionally, if the method is executed by a fingerprint identification device, the fingerprint identification device may acquire the pressed area reported by the touch screen. The fingerprint identification device can also carry out fingerprint identification according to the light signal that the display screen shines the finger and reflects through the finger in throwing the light zone.

For example, when a finger performs a pressing operation in the fingerprint identification area, the touch screen determines the pressing area of the finger according to the signal variation on each contact point and sends the information of the pressing area to the fingerprint identification device. The fingerprint identification device determines a polishing area according to the information of the pressing area reported by the touch screen, and sends the information of the polishing area to the processor, and the processor controls the display screen to emit light in the polishing area. The light is reflected by the finger and then collected by the fingerprint identification device. The fingerprint identification device carries out fingerprint identification according to the collected optical signals.

Taking fig. 8(a) as an example, when a finger performs a pressing operation in a fingerprint collection area, signal values at respective contact points on the touch screen change, and based on these changes, the touch screen can determine the pressing area as shown by a hatched portion in fig. 8(b), for example. Wherein, the pressing area can be directly used as a lighting area of the display screen. Alternatively, a graphical fit may be performed on the pressed region to obtain a polished region having a particular shape.

Hereinafter, a process of determining the polished area is described in detail.

Optionally, a graph fitting may be performed based on a central point of the pressing region, a long axis of the pressing region, and a short axis of the pressing region, to obtain an elliptical polished region; alternatively, a circular polished region may be obtained by performing a pattern fitting based on the center point of the pressed region and the long axis of the pressed region.

Preferably, the pressing region can be covered with a polished region obtained by performing a pattern fitting based on the pressing region.

For example, as shown in fig. 9, after the finger performs the pressing operation in the fingerprint collection area and obtains the information of the corresponding pressing area, a circular area may be obtained by performing a graph fitting with the center point as the center and the long axis of the pressing area as the radius according to the obtained center point position of the pressing area and the long axis of the pressing area. The circular area is the polishing area.

For another example, as shown in fig. 10, after the finger performs the pressing operation in the fingerprint collection area and obtains the information of the corresponding pressing area, a graph fitting may be performed according to the obtained center point position of the pressing area, the long axis of the pressing area, and the short axis of the pressing area, and based on the center point, the long axis, and the short axis, to obtain the elliptical area as shown in fig. 10. The elliptical area is the polishing area. It can be seen that when the pressing region is elliptical, the elliptical light-up region shown in fig. 10 substantially overlaps with the pressing region, and the area of the light-up region is substantially equal to that of the pressing region, achieving minimization of power consumption.

In consideration of the shape characteristics of the finger, when the finger performs a fingerprint pressing operation within the fingerprint collection area, the pressing area shape of the fingerprint pressing operation is generally approximately elliptical or circular. Therefore, the oval or circular polishing area is fitted according to the pressing area, the realization is simple, the polishing area with the smallest area covering the pressing area is convenient to form, and the power consumption of the display screen is further reduced.

However, the shape of the light-emitting region in the embodiment of the present application is not limited at all, and may be a circle, an ellipse, a rectangle, a square, or the like as described above, or a light-emitting region having another shape may be fitted to the pressing region as long as the light-emitting region can be covered. For example, as shown in fig. 11, the smoothed region obtained by fitting based on the information of the pressed region, for example, the center, the major axis, and the minor axis of the pressed region may be a rectangular region. In addition, the area of the light-emitting area is not limited in any way in the embodiment of the present application, and the area of the light-emitting area is only required to be smaller than the area of the fingerprint collection area.

After the fingerprint sensor collects the optical signal in the fingerprint collecting area, data processing can be carried out according to the fingerprint data carried in the optical signal. For example, the fingerprint data may be subjected to preprocessing operations such as filtering, convolution, and enhancement, and operations such as image feature extraction. The processed data can be used for fingerprint matching with a fingerprint template in a fingerprint database, and fingerprint identification is completed according to a matching result. When the area of the fingerprint collecting area is increased, more optical signals are collected. If the data carried in the optical signal collected in the whole fingerprint collection area is processed, the efficiency of fingerprint identification is affected.

Therefore, optionally, the pressing area is also used for selecting the fingerprint data in the pressing area from the fingerprint data carried by the optical signal collected in the fingerprint collecting area by the fingerprint identification device, wherein the fingerprint data in the pressing area is used for fingerprint identification by the fingerprint identification device.

Or, optionally, the light irradiation region is further used for selecting, by a fingerprint identification device, fingerprint data located in the light irradiation region from fingerprint data carried by optical signals acquired in the fingerprint acquisition region, where the fingerprint data located in the light irradiation region is used for fingerprint identification by the fingerprint identification device.

The fingerprint data located in the pressing area or the light-striking area is used to determine a valid fingerprint image, and we can use the area in the screen for generating the valid fingerprint image as a fingerprint processing area. Because the area of fingerprint processing region is less than the regional area of fingerprint collection, therefore the fingerprint data volume that fingerprint identification device handled diminishes, can improve fingerprint identification's efficiency, promotes user experience.

The fingerprint processing areas may be the same shape as the polished areas in the previous embodiments, for example, circular areas or elliptical areas both covering the fingerprint pressing area. The shape of the fingerprint processing area may also be different from the shape of the polished area in the previous embodiment, for example, the polished area is a circle, and the fingerprint processing area is an oval area. Moreover, the areas of the polishing area and the fingerprint processing area can be equal or unequal.

Preferably, the fingerprint processing area and the polishing area are the same area. At this time, after the polishing area is determined, the fingerprint processing area is determined.

Optionally, the fingerprint processing area is the pressing area.

For example, as shown in fig. 12, when a finger performs a pressing operation in a fingerprint collection area, the touch screen can acquire the pressing area of the finger. The touch screen can report the information of the pressed area to the fingerprint identification device. The fingerprint identification device cuts the data carried by the optical signal collected in the fingerprint collection area based on the pressing area, and obtains the fingerprint data in the pressing area as shown in fig. 12. The fingerprint identification device can perform fingerprint identification according to the fingerprint data in the pressing area.

In fig. 12 to 14, the number 1 and the number 0 merely represent values where there is data, not specific fingerprint data. Since the amount of data in the light signal collected by the fingerprint sensor is much larger than that shown in the figure, for the sake of illustration, only 0 and 1 are used to represent the data at these positions. In practical applications, the value of the fingerprint data located in the pressing area is generally larger than the value of the fingerprint data in areas outside the pressing area, and the value of the fingerprint data in the vicinity of the pressing area decreases with increasing distance from the pressing area. These fingerprint data may be, for example, the gray-scale values of the respective pixels in a fingerprint image obtained by imaging the acquired light signals.

Optionally, a graph fitting may be performed based on a center point of the pressing region, a long axis of the pressing region, and a short axis of the pressing region, to obtain an elliptical fingerprint processing region; alternatively, a circular fingerprint processing area may be obtained by performing a pattern fitting based on the center point of the pressing area and the long axis of the pressing area.

Preferably, the fingerprint processing area obtained by performing the pattern fitting based on the pressing area can cover the pressing area.

For example, as shown in fig. 13, when a finger performs a pressing operation in a fingerprint collection area, the touch screen can acquire the pressing area of the finger. The touch screen may report information of the pressed region, such as a center point position of the pressed region and a long axis of the pressed region, to the fingerprint recognition device. The fingerprint identification device takes the central point position as the center and takes the long axis as the radius to carry out graph fitting to obtain a circular area. The circular area is the fingerprint processing area. The fingerprint identification device can carry out fingerprint identification according to the fingerprint data in the circular area.

For another example, as shown in fig. 14, when a finger performs a pressing operation in the fingerprint collection area, the touch screen can acquire the pressing area of the finger. The touch screen may report information of the pressed region, such as a center point position of the pressed region, a major axis of the pressed region, and a minor axis of the pressed region, to the fingerprint recognition device. The fingerprint recognition device performs a pattern fitting based on the center point, the major axis and the minor axis to obtain an elliptical region as shown in fig. 14. The oval area is the fingerprint processing area. It can be seen that when the fingerprint pressing area is an ellipse, the ellipse fingerprint processing area shown in fig. 14 substantially overlaps with the pressing area, the area of the fingerprint processing area is substantially equal to the area of the pressing area, and the data processing amount is minimal. The fingerprint identification device carries out fingerprint identification according to the fingerprint data in the oval area.

In consideration of the shape characteristics of the finger, when the finger performs a fingerprint pressing operation within the fingerprint collection area, the pressing area shape of the fingerprint pressing operation is generally approximately elliptical or circular. Therefore, the oval or circular fingerprint processing area is fitted according to the pressing area, the implementation is simple, the fingerprint processing area with the smallest area covering the pressing area is convenient to form, the processing amount of fingerprint data is further reduced, and the fingerprint identification efficiency is improved.

However, the shape of the fingerprint processing area in the embodiment of the present application is not limited at all, and may be a circle, an ellipse, a rectangle, a square, or the like as described above, or a fingerprint processing area having another shape may be fitted according to the pressing area as long as the pressing area can be covered. For example, as shown in fig. 11, the smoothed region obtained by fitting based on the information of the pressed region, for example, the center, the major axis, and the minor axis of the pressed region may be a rectangular region. In addition, the area of the fingerprint processing area is not limited in any way in the embodiment of the present application, and only needs to be smaller than the area of the fingerprint acquisition area.

After the target pressing information is acquired, whether the target pressing information changes relative to the initial pressing information can be judged. Determining an effective fingerprint image according to the target pressing information under the condition that the target pressing information changes relative to the initial pressing information; in the case where the target compression information is unchanged from the initial compression information, a valid fingerprint image may be determined from the initial compression information.

The screen in the embodiment of the present application may be an OLED display screen.

The at least one fingerprint sensor in the embodiments of the present application may comprise two or more fingerprint sensors, that is, the method of the embodiments of the present application may be applied in a large area fingerprint identification scheme.

The fingerprint sensor in the embodiment of the application can comprise a sensing array with a plurality of optical sensing units, and the sensing array is used for receiving light signals returned by the finger passing through the optical path guiding structure and generating a fingerprint image of the finger according to the returned light signals.

The optical path directing structure may be any of the optical path directing structures described above. For example, the optical path directing structure may comprise a microlens array, or the optical path directing structure may comprise an array of collimators.

The above process is described in detail below with reference to specific embodiments.

Referring to fig. 15, when the application software initiates a fingerprint registration or fingerprint recognition request, the application software displays an indication map to guide the user to press. And pressing the touch screen by the finger of the user, detecting the pressing area of the finger and judging whether the pressing area of the finger reaches a threshold value. If the pressing area of the finger does not reach the threshold value, continuously detecting the pressing area of the finger; and if the pressing area of the finger reaches the threshold value, the processor extracts initial pressing information of the finger and controls the display screen to be lightened according to the initial pressing information so as to illuminate the contact area of the finger and the display screen. The processor may then initiate an independent thread to initiate touch screen information detection, i.e., fingerprint data and touch screen data are collected separately at the same time window.

The fingerprint sensor collects fingerprint data, or in the case of a plurality of fingerprint sensors, the processor may determine at least a part of the fingerprint sensors for fingerprint collection based on the initial pressing information, and control the at least part of the fingerprint sensors to collect fingerprint data. Meanwhile, the processor acquires target pressing information of the finger pressing the touch screen. If the fingerprint sensor finishes the acquisition, a touch screen information detection ending signal can be sent out, and the processor finishes the detection of the touch screen information after receiving the ending signal.

And the processor extracts effective fingerprint data according to the acquired target pressing information and eliminates ineffective fingerprint data. In this process, the processor may determine whether there is a change in the target compression information relative to the initial compression information, and if so, may use the target compression information to determine valid fingerprint data, and if not, may use the initial compression information to determine valid fingerprint data.

When the processor determines whether the target pressing information changes from the initial pressing information, it may determine whether a pressing coordinate of the finger changes, determine whether a pressing area of the finger changes, determine whether a pressing pressure of the finger changes, or determine whether a plurality of information among the pressing coordinate, the pressing area, the pressing pressure, the contact surface long axis, and the contact surface short axis changes, which is not specifically limited in this embodiment of the application.

The pressing information in the embodiment of the present application may include other pressing data besides the pressing coordinate, the pressing area, and the pressing force, which is not limited in the embodiment of the present application.

The above process may be used in the process of performing fingerprint image matching, and may also be used in the process of performing fingerprint registration, which is not specifically limited in this embodiment of the present application.

In addition, an embodiment of the present application further provides an electronic device, as shown in fig. 16, where the electronic device 1600 includes: a screen 1610, at least one fingerprint sensor 1620, and a processor 1630, the processor 1630 being configured to perform any of the above-described methods for fingerprint recognition.

It should be noted that the optical fingerprint sensor in the embodiment of the present application may represent an optical fingerprint sensor chip.

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

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

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

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

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

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

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

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

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

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

Claims

1. A method for fingerprint recognition, the method being applied in an electronic device having a screen and at least one fingerprint sensor, a fingerprint acquisition area of the at least one fingerprint sensor being located in a display area of the screen, the method comprising:

acquiring initial pressing information when a finger presses the fingerprint acquisition area;

determining at least part of the at least one fingerprint sensor for acquiring the fingerprint image of the finger according to the initial pressing information;

controlling light-emitting pixels of the screen to emit light according to the initial pressing information, so that the light emitted by the light-emitting pixels can illuminate a contact area of the finger and the screen;

collecting a fingerprint image of the finger according to an optical signal emitted by the light-emitting pixel and reflected back after the optical signal irradiates the finger;

collecting target pressing information that the finger presses the screen while at least some of the at least one fingerprint sensor collects a fingerprint image of the finger;

and determining an effective fingerprint image in the fingerprint images according to the target pressing information, wherein the effective fingerprint image is used for fingerprint identification.

2. The method of claim 1, wherein a time window for acquiring the fingerprint image coincides with a time window for acquiring the target compression information.

3. The method of claim 1, wherein the target compression information comprises at least one of: pressing coordinates, pressing area, contact surface long axis, contact surface short axis and pressing pressure.

4. The method according to any one of claims 1-3, wherein the fingerprint acquisition areas are stitched together by a sensing area of the at least one fingerprint sensor, and the light-emitting pixels are light-emitting pixels corresponding to the sensing area of the at least part of the fingerprint sensor.

5. The method according to any one of claims 1-3, wherein the initial pressing information satisfies a preset condition, the preset condition comprising that the pressing area of the finger reaches a first threshold value and/or that the pressing pressure of the finger reaches a second threshold value.

6. The method according to any of claims 1-3, wherein the initial compression information comprises at least one of: the pressing coordinate, the pressing area, the pressing pressure, the contact surface long axis and the contact surface short axis.

7. The method according to any one of claims 1-3, further comprising:

determining the at least partial fingerprint sensor for acquiring the fingerprint image of the finger according to the initial pressing information of the finger, wherein the at least partial fingerprint sensor is the fingerprint sensor corresponding to the contact area in the at least one fingerprint sensor.

8. The method according to any one of claims 1-3, further comprising:

determining whether the target compression information is changed from the initial compression information;

the determining, according to the target pressing information, a valid fingerprint image of the fingerprint images includes:

and under the condition that the target pressing information is changed relative to the initial pressing information, determining the effective fingerprint image according to the target pressing information.

9. The method of any one of claims 1-3, wherein the at least one fingerprint sensor comprises two or more fingerprint sensors.

10. A method according to any one of claims 1-3, characterized in that the screen is an organic light emitting diode, OLED, screen.

11. A method according to any one of claims 1 to 3, wherein the at least one fingerprint sensor comprises a sensing array having a plurality of optical sensing elements for receiving light signals returned by the finger passing through the optical path directing structure and generating a fingerprint image of the finger from the returned light signals.

12. An electronic device, comprising:

a screen;

at least one fingerprint sensor, a fingerprint acquisition area of the at least one fingerprint sensor being located within a display area of the screen;

a processor for performing the method of any one of claims 1 to 11.