WO2020177083A1

WO2020177083A1 - Fingerprint recognition method and apparatus, and terminal device

Info

Publication number: WO2020177083A1
Application number: PCT/CN2019/077030
Authority: WO
Inventors: 杜灿鸿
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-03-05
Filing date: 2019-03-05
Publication date: 2020-09-10
Also published as: CN110036397A

Abstract

The embodiments of the present application provide a fingerprint recognition method and apparatus, and a terminal device. Said method comprises: acquiring a pressed area by a finger within a fingerprint detection area; performing fingerprint recognition on the reflected light of the finger that is received from a target light-emitting area of a display screen, the target light-emitting area being determined according to the pressed area. The method, the apparatus, and the terminal device of the embodiments of the present application help to eliminate the problem of spot leakage caused by the deviation of the pressing position of a finger, thereby improving the comfort of user experience.

Description

Fingerprint identification method, device and terminal equipment

Technical field

This application relates to the technical field of fingerprint identification, and in particular to a method, device and terminal equipment for fingerprint identification.

Background technique

The light-emitting area used for fingerprint detection on the display screen is usually a fixed size. When the pressing position of the finger is shifted, it may cause the light emitted from the light-emitting area to leak out, which will reduce the comfort of the user experience, especially in a dark environment.

Summary of the invention

In view of this, the embodiments of the present application provide a fingerprint recognition method, device, and terminal device, which help eliminate the problem of light spot leakage caused by the offset of the finger pressing position, thereby improving the comfort of the user experience.

In a first aspect, a fingerprint recognition method is provided, the method includes: acquiring a pressing area of a finger in a fingerprint detection area; fingerprinting the reflected light of the finger received from the target light-emitting area of the display screen It is recognized that the target light-emitting area is determined according to the pressing area.

According to the pressing area of the finger on the display screen, the light-emitting area of the display is dynamically adjusted, thereby fingerprinting the reflected light of the finger received from the adjusted light-emitting area, which is helpful to eliminate the offset caused by the pressing position of the finger The problem of light spot leakage, thereby improving the comfort of user experience.

In a possible implementation manner, the acquiring the pressing area of the finger in the fingerprint detection area includes: in the case that the finger presses the display screen, according to receiving from the initial light-emitting area of the display screen The data size distribution of, and the pressing area is obtained, and the target light-emitting area is determined after adjusting the initial light-emitting area according to the pressing area.

In a possible implementation, when the finger is not fully pressed to the initial light-emitting area, the area of the initial light-emitting area is larger than the area of the target light-emitting area, and the area of the target light-emitting area is larger than Or equal to the area of the pressing area.

Optionally, the area of the target light-emitting area is slightly larger than the area of the pressing area, which will not cause obvious leakage of the light spot, but also can ensure that the pressing area has enough illumination light sources without affecting the fingerprint recognition performance.

In a possible implementation manner, the brightness of the light emitted from the initial light-emitting area is less than the brightness of the light emitted from the target light-emitting area.

In a possible implementation manner, the brightness of the light emitted from the initial light-emitting area is less than or equal to 200 nits; and/or the brightness of the light emitted from the target light-emitting area is greater than or equal to 450 nits.

Reduce the brightness of the light emitted by the initial light-emitting area to less than 200 nits, which is much less irritating to the human eye, and increase the brightness of the light emitted by the target light-emitting area to more than 450nit to ensure the accuracy of the collected fingerprint images degree.

In a possible implementation manner, the acquiring the pressing area of the finger in the fingerprint detection area includes: acquiring the pressing area in the first scanning mode; and the pair receiving from the target light-emitting area of the display screen Performing fingerprint recognition on the reflected light of the finger includes: performing fingerprint recognition on the reflected light of the finger received from the target light-emitting area in the second scanning mode; wherein, in the first scanning mode The number of working pixels in the fingerprint detection area below is smaller than the number of working pixels in the fingerprint detection area in the second scanning mode.

When acquiring the pressed area, the working pixels are reduced, which can shorten the scanning time.

In a possible implementation, in the first scanning mode, at least one pixel is separated between any two working pixels in the fingerprint detection area; in the second scanning mode, the fingerprint detection All pixels in the area start working at the same time.

In a possible implementation manner, in the first scanning mode, there is an interval of 10 pixels between any two working pixels in the fingerprint detection area.

Usually the pitch of one pixel is 50μm, and the pitch of 10 pixels is 500μm, which is equivalent to 500μm in the detection of the pressing area. This accuracy is sufficient for the detection requirements of the pressing area, and the scanning time in the first scan mode can be shortened to 1/10 of the scan time in the second scan mode.

In a second aspect, a fingerprint identification device is provided, which is used to execute the first aspect or the method in any possible implementation manner of the first aspect. Specifically, the apparatus may include a unit for executing the method in the first aspect or any possible implementation of the first aspect.

In a third aspect, a terminal device is provided, which includes a receiver, a memory, a processor, a sensor, and a bus system. The memory is used to store a computer program, the receiver is used to receive data, and the processor is used to process instructions stored in the memory. The processor is used to call and run a computer program from the memory, and when the program is executed, the processor executes the above-mentioned first aspect or any possible implementation method of the first aspect.

In a fourth aspect, a computer-readable medium is provided for storing a computer program, the computer program including instructions for executing the first aspect or any possible implementation of the first aspect.

In a fifth aspect, a computer program product including instructions is provided, which when run on a computer, causes the computer to execute the above-mentioned first aspect or the method in any optional implementation of the first aspect.

These and other aspects of the application will be more concise and understandable in the description of the following embodiments.

Description of the drawings

Fig. 1 shows a schematic block diagram of an application scenario of an embodiment of the present application.

Fig. 2 shows another schematic block diagram of an application scenario of an embodiment of the present application.

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

Fig. 4 shows a schematic diagram of a fast scan mode provided by an embodiment of the present application.

Fig. 5 shows a schematic flowchart of a fingerprint identification method according to an embodiment of the present application.

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

Fig. 7 shows a schematic block diagram of a terminal device according to an embodiment of the present application.

detailed description

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art should fall within the protection scope of the embodiments of this application.

The entry method of the functional interface involved in the embodiments of the present application can be applied to smart phones, tablet computers, notebook computers, desktops, and other mobile terminals or other terminal devices with biometric identification devices. The terminal equipment has a biometric identification device. Biometric information includes, but is not limited to: any one or more of fingerprints, iris, retina, genes, voices, human faces, palm geometry, veins, gait, and handwriting.

As a common application scenario, the terminal device has a fingerprint recognition device. In the above terminal device, the fingerprint recognition device can be specifically an optical fingerprint device, which can be set in a partial area or the entire area under the display screen to form a screen. Under-display optical fingerprint system. Alternatively, the fingerprint identification device can also be partially or fully integrated into the display screen of the terminal device, thereby forming an in-display optical fingerprint system. It should be understood that the embodiments of the present application only take the optical fingerprint device as an example for description, but should not constitute any limitation to the embodiments of the present application, and the embodiments of the present application are also applicable to other systems using optical imaging technology.

As shown in FIG. 1 is a schematic structural diagram of a terminal device to which the embodiment of the application can be applied. The terminal device 10 includes a display screen 120 and an optical fingerprint device 130, wherein the optical fingerprint device 130 is disposed under the display screen 120 Local area. The optical fingerprint device 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131, and the area where the sensing array is located or its sensing area is the fingerprint detection area of the optical fingerprint device 130 103. As shown in FIG. 1, the fingerprint detection area 103 is located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint device 130 may also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the terminal device 10, and the optical fingerprint device 130 may be designed to The optical signal of at least a part of the display area of the display screen 120 is guided to the optical fingerprint device 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.

It should be understood that the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, through optical path design such as lens imaging, reflective folding optical path design, or other optical path design such as light convergence or reflection, etc. The area of the fingerprint detection area 103 of the optical fingerprint device 130 can be made larger than the area of the sensing array of the optical fingerprint device 130. In other alternative implementations, if for example, light collimation is used for light path guidance, the fingerprint detection area 103 of the optical fingerprint device 130 may also be designed to be substantially the same as the area of the sensing array of the optical fingerprint device 130.

Therefore, when the user needs to unlock the terminal device or perform other fingerprint verification, he only needs to press his finger on the fingerprint detection area 103 located in the display screen 120 to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 10 adopting the above structure does not need to reserve a space on the front side for the 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 be basically extended to the front of the entire terminal device 10.

As an optional implementation, as shown in FIG. 1, the optical fingerprint device 130 includes a light detecting part 134 and an optical component 132, and the light detecting part 134 includes the sensor array and is electrically connected to the sensor array. The connected reading circuit and other auxiliary circuits can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor. The sensing array is specifically a photodetector (Photodetector) array, which includes A plurality of photodetectors distributed in an array, the photodetector can be used as the optical sensing unit as described above; the optical component 132 can be arranged above the sensing array of the photodetecting part 134, which can specifically include The filter layer (Filter), the light guide layer or the light path guide structure and other optical elements, the filter layer can be used to filter out the ambient light penetrating the finger, and the light guide layer or the light path guide structure is mainly used to remove The reflected light reflected from the finger surface is guided to the sensing array for optical detection.

In terms of specific implementation, the optical assembly 132 and the light detecting 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 is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.

Wherein, the light guide layer or light path guiding structure of the optical component 132 has multiple implementation schemes. For example, the light guide layer may specifically be a collimator layer made on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole array. The collimating unit can be specifically a small hole. Among the reflected light reflected from the finger, the light that is perpendicularly incident on the collimating unit can pass through and be passed by the optical sensing unit below it. The light with an excessively large incident angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensing unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it. The sensor array can detect the fingerprint image of the finger.

In another embodiment, the light guide layer or the light path guide structure may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which The sensing array used to converge the reflected light reflected from the finger to the light detection part 134 below it, so that the sensing array can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further have a pinhole formed in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device to improve the optical The fingerprint imaging effect of the fingerprint device 130.

In other embodiments, the light guide layer or the light path guide structure may also specifically adopt a micro-lens (Micro-Lens) layer. The micro-lens layer has a micro-lens array formed by a plurality of micro-lenses, which can be grown by semiconductors. A process or other processes are formed above the sensing array of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array. Moreover, other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer. More specifically, the microlens layer and the sensing unit may also include The light-blocking layer of the micro-hole, wherein the micro-hole is formed between the corresponding micro-lens and the sensing unit, the light-blocking layer can block the optical interference between the adjacent micro-lens and the sensing unit, and make the sensing The light corresponding to the unit is condensed into the microhole through the microlens and is transmitted to the sensing unit through the microhole to perform optical fingerprint imaging. It should be understood that several implementation solutions of the above-mentioned optical path guiding structure can be used alone or in combination. For example, a microlens layer can be further provided under 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 micro lens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.

As an optional embodiment, the display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display or a micro-LED (Micro-LED) display Screen. Taking an OLED display screen as an example, the optical fingerprint device 130 may use the display unit (ie, an 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 against 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. The light 111 is reflected on the surface of the finger 140 to form reflected light or pass through all the fingers. The finger 140 scatters to form scattered light. In related patent applications, for ease of description, the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Since the ridge and valley of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the generated light 152 from the fingerprint ridge have different light intensities. After the reflected light passes through the optical component 132, It is received by the sensor array 134 in the optical fingerprint device 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, so that the The terminal device 10 implements an optical fingerprint recognition function.

In other embodiments, the optical fingerprint device 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint device 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens. Taking a liquid crystal display with a backlight module and a liquid crystal panel as an example, in order to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the terminal device 10 may also include an excitation light source for optical fingerprint detection. The excitation light source may specifically be an infrared light source or a light source of invisible light of a specific wavelength, which may be arranged under the backlight module of the liquid crystal display or arranged in the edge area under the protective cover of the terminal device 10, and the The optical fingerprint device 130 can be arranged under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint device 130; or, the optical fingerprint device 130 can also be arranged in the backlight module. Under the group, and the backlight module is designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130 through openings or other optical designs on the film layers such as diffuser, brightness enhancement film, and reflective film. . When the optical fingerprint device 130 adopts a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.

It should be understood that, in specific implementation, the terminal device 10 further includes a transparent protective cover, and the cover may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the terminal. The front of the device 10. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.

On the other hand, in some embodiments, the optical fingerprint device 130 may include only one optical fingerprint sensor. At this time, the fingerprint detection area 103 of the optical fingerprint device 130 has a small area and a fixed position, so the user is performing fingerprint input At this time, it is necessary to press the finger to a specific position of the fingerprint detection area 103, otherwise the optical fingerprint device 130 may not be able to collect fingerprint images, resulting in poor user experience. In other alternative embodiments, the optical fingerprint device 130 may specifically include multiple optical fingerprint sensors; the multiple optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the multiple optical fingerprint sensors The sensing area of the fingerprint sensor together constitutes the fingerprint detection area 103 of the optical fingerprint device 130. In other words, the fingerprint detection area 103 of the optical fingerprint device 130 may include multiple sub-areas, and each sub-area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint detection area of the optical fingerprint module 130 103 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 130 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

As shown in Figure 2, the sensor is set on a flexible printed circuit board (fpc). The light-emitting area of the OLED display completely covers the fingerprint detection area of the sensor. When a finger presses the light-emitting area, the light-emitting area emits light spots. , After the finger reflection from the light-emitting area to the fingerprint detection area. Usually the light-emitting area is a fixed size, and has a large brightness, usually greater than 450nit. For example, on some mobile phones, the brightness of the light emitted by the light-emitting area is 600 nit. The size of the light-emitting area is generally a circle with a diameter of 12mm or other close sizes. Usually this size is smaller than the finger of the finger when pressed by the finger. When the finger is fully pressed on the light-emitting area, the light emitted by the light-emitting area may be completely Obscured. When the finger is not fully pressed on the light-emitting area, the light emitted by the light-emitting area will leak out. This part of the leaked light may irritate the human eyes, especially when it is in a dark environment, the brightness of the leaked light is relatively large , Will cause obvious "dazzling" to the human eye, thereby reducing the comfort of the user experience.

FIG. 3 shows a schematic block diagram of a fingerprint identification method 200 provided by an embodiment of the present application. As shown in FIG. 3, the method 200 may be executed by a fingerprint identification device, and the method 200 includes some or all of the following contents:

S210: Acquire the pressing area of the finger in the fingerprint detection area;

S220: Perform fingerprint recognition on the reflected light of the finger received from the target light-emitting area of the display screen, the target light-emitting area being determined according to the pressing area.

First, it should be noted that the fingerprint detection area, that is, the fingerprint collection area, can also be referred to as an active array (AA).

Specifically, when the user performs a fingerprint pressing operation on the display screen, the pressing area of the finger in the fingerprint detection area may be acquired first. For example, when the display screen detects a fingerprint pressing operation, the light emitted from the initial light-emitting area is reflected and incident on the sensor below the display screen. The sensor can determine the pressed area in the fingerprint detection area according to the distribution of the received data size . From the data received by the sensor, the data size of the pressed area will be significantly larger than the data size of the non-pressed area. After the sensor acquires the pressing area, it can inform the processor to determine the shape of the target light-emitting area according to the shape of the pressed area, and then the processor can trigger the display screen to adjust the initial light-emitting area according to the shape of the target light-emitting area determined by the processor. The light emitted from the target light-emitting area is reflected by the finger and is incident on the sensor below the display screen again. The sensor then scans the fingerprint and outputs the fingerprint image.

Optionally, to obtain the pressing area of the finger in the fingerprint detection area, the display screen may also fit the pressing area in the fingerprint detection area according to the touch points of the finger on the display screen. In other words, when a finger presses on the display screen, the display screen does not emit light, and the display screen can obtain the fingerprint detection area in advance, and fit the pressed area in the fingerprint detection area according to the touch points of the finger on the display screen. And report the pressing area to the processor, the processor can determine the shape of the target light-emitting area according to the shape of the pressed area, and then the processor can trigger the display to emit light in the target light-emitting area determined by the processor, and the light from the target light-emitting area is reflected by the finger , Incident on the sensor below the display, the sensor then scans the fingerprint and outputs the fingerprint image.

When the finger fully presses the initial light-emitting area, the light emitted from the initial light-emitting area is completely covered by the finger and will not leak out and will not irritate human eyes. When the finger does not fully press the initial light-emitting area, the light of the initial light-emitting area is not completely blocked by the finger. If the initial light-emitting area can be dynamically adjusted to the target light-emitting area according to the pressing area of the finger, the eye irritation can be minimized Time, which can improve the comfort of the user experience.

Specifically, when the finger does not completely press the initial light-emitting area, the area of the target light-emitting area will naturally be smaller than the initial light-emitting area, that is, the initial light-emitting area completely covers the target light-emitting area. The area of the target light-emitting area may be greater than or equal to the area of the pressing area, that is, the target light-emitting area completely covers the pressing area. For example, the area of the target light-emitting area can be slightly larger than the area of the pressing area, which will not cause obvious leakage of the light spot, and can ensure that the pressing area has enough illumination light sources, so as not to affect the fingerprint recognition performance.

Optionally, the area of the target light-emitting area may also be slightly smaller than the area of the pressing area under the condition that sufficient illumination light sources are ensured in the pressing area.

Optionally, in the embodiment of the present application, the brightness of the initial light-emitting area may be set to be smaller than the brightness of the target light-emitting area. For example, the brightness of the initial light-emitting area can be adjusted to be less than or equal to 200 nit, which is much less irritating to human eyes. The brightness of the target light-emitting area is the brightness that can be scanned by fingerprints, and is usually greater than or equal to 450 nit. Specifically, the brightness of the target light-emitting area can be adjusted to 600 nit.

Optionally, if the time required to adjust the initial light-emitting area to the target light-emitting area is relatively short, you can also only adjust the shape of the initial light-emitting area to the shape of the target light-emitting area without adjusting the brightness of the initial light-emitting area, that is, , The brightness of the initial light-emitting area and the target light-emitting area are the same. Since a short adjustment time may not be enough to cause irritation to human eyes, it can also improve the comfort of the user experience.

Optionally, in the embodiment of the present application, the acquiring the pressing area of the finger in the fingerprint detection area includes: in the first scan mode, acquiring the pressing area; and the pair is illuminated from the target on the display screen. Performing fingerprint recognition on the reflected light of the finger received by the area includes: performing fingerprint recognition on the reflected light of the finger received from the target light-emitting area in the second scan mode; wherein, in the first scan mode, The number of working pixels in the fingerprint detection area in the scanning mode is less than the number of working pixels in the fingerprint detection area in the second scanning mode.

Specifically, in the normal fingerprint scanning mode (that is, the second scanning mode described above), all pixels (pixels) in the fingerprint detection area must be activated at the same time, which results in a relatively long time for scanning a fingerprint image. In order to speed up the detection speed of the size of the pressed area and reduce the time overhead, a fast scan mode (that is, the first scan mode mentioned above) is defined here. Some pixels in the fingerprint detection area start to work, while other pixels do not work.

The fast scanning mode, for example, can be scanned in interlaced rows and columns. The distance between two working pixels can be 2-30 pixels apart, as shown in Figure 4 below. Typically, the two working pixels are separated by 10 pixels. Pixel, usually the pitch of 1 pixel is 50um, and the pitch of 10 pixels is 500um, which is equivalent to the accuracy of detecting the finger pressing area is 500um. This accuracy is sufficient for the detection requirements of the pressed area. Higher detection accuracy requirements can also be reduced The distance between two pixels. As the number of working pixels is significantly reduced, taking 10 pixels as an example, the scanning time of the fast scanning mode can be shortened to 1/10 of the original.

It should be understood that the scanning mode for obtaining the pressed area can be the same as the scanning mode for fingerprint recognition, that is, the scanning time required to obtain the pressed area and the scanning time required to obtain the fingerprint image can be the same. At this time, the light emitted by the initial light-emitting area can be changed. The brightness can be reduced to a brightness that is not irritating to the human eye; or the brightness of the light emitted by the initial light-emitting area is the same as that of the target light-emitting area, and the scanning mode for obtaining the pressed area is adjusted to the above-mentioned fast scanning mode, so that the scanning The time is short enough to cause eye irritation. It is also possible to adjust both the brightness of the initial light-emitting area and the scanning mode for obtaining the pressed area.

Optionally, the embodiments of the present application can also be applied to half-screen or full-screen fingerprint detection scenarios, that is, the fingerprint detection area can be obtained by splicing multiple sensors, and when the finger presses the display screen, it can be the sensor under the press area Start the work, the sensor under the non-press area can not work, the initial light-emitting area covers the fingerprint detection area spliced by the sensor that starts the work, not covering the fingerprint detection area spliced by all sensors.

The workflow of the embodiment of the present application will be described in detail below in conjunction with FIG. 5.

1. Press the finger on the display screen, the display detects the finger press, set the shape of the initial light-emitting area to S1, and the brightness to L1, where the shape S1 is larger than the AA area of the sensor, and the light from the initial light-emitting area can illuminate the entire AA area. The brightness L1 can be low brightness. This brightness is relatively low, such as 200nit, which is relatively less irritating to human eyes.

2. The sensor receives the light emitted from the initial light-emitting area and scans in the fast scan mode, and outputs the shape S0 of the pressed area according to the distribution of the data size received by the sensor;

3. According to the pressing area S0, modify the light-emitting area from the initial light-emitting area shape S1 to the target light-emitting area shape S2, where S2 is slightly greater than or equal to S0, S2 is less than S1, and the brightness of the light-emitting area can be modified from L1 to L2. L2 is high brightness;

4. The sensor receives the reflected light of the finger from the target light-emitting area S2, and performs fingerprint recognition in the normal scanning mode, thereby outputting a fingerprint image.

It should be understood that the size of the sequence numbers of the foregoing processes does not mean the order of execution. The execution order of the processes should be determined by their functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

Although the application and its advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made to the application without departing from the spirit and scope of the application as defined by the appended claims.

FIG. 6 shows a schematic block diagram of a fingerprint identification device 300 according to an embodiment of the present application. The fingerprint identification device 300 is arranged below the display screen. As shown in FIG. 6, the fingerprint identification device 300 includes:

The processing unit 310 is configured to obtain the pressing area of the finger in the fingerprint detection area;

The sensor unit 320 is configured to perform fingerprint recognition on the reflected light of the finger received from a target light-emitting area of the display screen, the target light-emitting area being determined according to the pressing area.

Therefore, the fingerprint recognition device of the embodiment of the present application dynamically adjusts the light-emitting area of the display screen according to the pressing area of the finger on the display screen, thereby performing fingerprint recognition on the reflected light of the finger received from the adjusted light-emitting area, which is beneficial to eliminate The problem of light spot leakage caused by the offset of the finger pressing position, thereby improving the comfort of the user experience.

Optionally, in the embodiment of the present application, the processing unit is specifically configured to: when the finger presses the display screen, according to the size distribution of the data received from the initial light-emitting area of the display screen , Acquiring the pressing area, and the target light-emitting area is determined after adjusting the initial light-emitting area according to the pressing area.

Optionally, in the embodiment of the present application, when the finger does not fully press the initial light-emitting area of the display screen, the area of the initial light-emitting area is larger than the area of the target light-emitting area, and the target emits light The area of the area is greater than or equal to the area of the pressing area.

Optionally, in the embodiment of the present application, the brightness of the light emitted from the initial light-emitting area is less than the brightness of the light emitted from the target light-emitting area.

Optionally, in the embodiment of the present application, the brightness of the light emitted from the initial light-emitting area is less than or equal to 200 nits; and/or the brightness of the light emitted from the target light-emitting area is greater than or equal to 450 nits .

Optionally, in the embodiment of the present application, the processing unit is specifically configured to: in the first scan mode, obtain the pressing area; the sensor unit is specifically configured to: in the second scan mode, The reflected light of the finger received by the target light-emitting area is used for fingerprint identification; wherein, the number of working pixels in the fingerprint detection area in the first scanning mode is smaller than that in the fingerprint detection in the second scanning mode The number of working pixels in the area.

Optionally, in the embodiment of the present application, in the first scanning mode, at least one pixel is separated between any two working pixels in the fingerprint detection area; in the second scanning mode, the All pixels in the fingerprint detection area start working at the same time.

Optionally, in the embodiment of the present application, in the first scanning mode, there is an interval of 10 pixels between any two working pixels in the fingerprint detection area.

The fingerprint identification device provided in FIG. 6 may correspond to the execution subject in the method embodiment of the present application, and the above-mentioned and other operations and/or functions of each unit in the fingerprint identification device are to implement the methods in FIGS. 3 and 5, respectively For the sake of brevity, the corresponding process will not be repeated here.

Optionally, an embodiment of the present application further provides a terminal device. The terminal device may include the fingerprint identification device and the display screen in the various embodiments described above, and the fingerprint identification device is arranged below the display screen.

Optionally, the terminal device further includes a processor configured to determine the target light emitting area according to the pressing area.

Optionally, the display screen in the terminal device may be an OLED display screen.

Optionally, the terminal equipment includes but is not limited to mobile phones, computers, multimedia machines, and game consoles.

FIG. 7 is a schematic block diagram of a terminal device 400 provided according to an embodiment of the present application. The terminal device 400 shown in FIG. 7 includes: a radio frequency (RF) circuit 410, a memory 420, other input devices 430, a display screen 440, a sensor 450, an audio circuit 460, an I/O subsystem 470, a processor 480, And power supply 490 and other components. Those skilled in the art can understand that the structure of the terminal device shown in FIG. 7 does not constitute a limitation on the terminal device, and may include more or less components than shown in the figure, or combine some components, or split some components , Or different component arrangements. Those skilled in the art can understand that the display screen 440 belongs to a user interface (User Interface, UI), and the terminal device 400 may include a user interface that is less than that shown or less.

Hereinafter, each component of the terminal device 400 will be specifically introduced with reference to FIG. 7:

The RF circuit 410 can be used for receiving and sending signals during information transmission or communication, in particular, after receiving the downlink information of the base station, it is processed by the processor 480; in addition, the designed uplink data is sent to the base station. Generally, the RF circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuit 410 can also communicate with the network and other devices through wireless communication. The memory 420 may be used to store software programs and modules. The processor 480 executes various functional applications and data processing of the terminal device 400 by running the software programs and modules stored in the memory 420. The memory 420 may mainly include a storage program area and a storage data area. The storage program area may store an operating system, an application program required by at least one function (such as a sound playback function, an image playback function, etc.), etc.; The data (such as audio data, phone book, etc.) created by the use of the terminal device 400 and the like. In addition, the memory 420 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

The other input device 430 may be used to receive input digital or character information, and generate signal input related to user settings and function control of the terminal device 400. Specifically, other input devices 430 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, optical mice (optical mice are touch sensitive that do not display visual output). Surface, or an extension of the touch-sensitive surface formed by the screen), etc. The other input device 430 is connected to the other input device controller 471 of the I/O subsystem 470, and performs signal interaction with the processor 480 under the control of the other device input controller 471.

The display screen 440 may be used to display information input by the user or information provided to the user and various menus of the terminal device 400, and may also accept user input. The specific display screen 440 may be a touch screen, and may include a display panel 441 and a touch panel 442. The touch panel 442 can cover the display panel 441, and the user can, according to the content displayed on the display panel 441 (the display content includes, but is not limited to, soft keyboard, virtual mouse, virtual keys, icons, etc.), the touch screen covered on the display panel 441 The operation is performed on or near the control panel 442. After the touch panel 442 detects the operation on or near it, it is transmitted to the processor 480 through the I/O subsystem 470 to determine the user input, and then the processor 480 passes the I/O according to the user input. The /O subsystem 470 provides corresponding visual output on the display panel 441. Although in FIG. 7, the touch panel 442 and the display panel 441 are used as two independent components to implement the input and input functions of the terminal device 400, but in some embodiments, the touch panel 442 and the display panel 441 may be combined. The input and output functions of the terminal device 400 are realized by integration.

The terminal device 400 may further include at least one sensor 450. For example, the sensor 450 may be a fingerprint sensor located under the display screen 440 or in the display screen 440, that is, the fingerprint identification device in the embodiment of the present application.

The audio circuit 460, the speaker 461, and the microphone 462 may provide an audio interface between the user and the terminal device 400. The audio circuit 460 can transmit the converted signal of the received audio data to the speaker 461, and the speaker 461 converts it into a sound signal for output; on the other hand, the microphone 462 converts the collected sound signal into a signal, which is received by the audio circuit 460 The audio data is converted into audio data, and then the audio data is output to the RF circuit 410 to be sent to, for example, another mobile phone, or the audio data is output to the memory 420 for further processing.

The I/O subsystem 470 is used to control input and output external devices, and may include other device input controller 471, sensor controller 472, and display controller 473. Optionally, one or more other input control device controllers 471 receive signals from other input devices 430 and/or send signals to other input devices 430, and other input devices 430 may include physical buttons (press buttons, rocker buttons, etc.) , Dial, slide switch, joystick, click wheel, optical mouse (optical mouse is a touch-sensitive surface that does not display visual output, or an extension of the touch-sensitive surface formed by the screen). It should be noted that the other input control device controller 471 may be connected to any one or more of the above-mentioned devices. The display controller 473 in the I/O subsystem 470 receives signals from the display screen 440 and/or sends signals to the display screen 440. After the display screen 440 detects the user input, the display controller 473 converts the detected user input into an interaction with the user interface object displayed on the display screen 440, that is, human-computer interaction is realized. The sensor controller 472 may receive signals from one or more sensors 450 and/or send signals to one or more sensors 450.

The processor 480 is the control center of the terminal device 400. It uses various interfaces and lines to connect the various parts of the entire terminal device, runs or executes the software programs and/or modules stored in the memory 420, and calls those stored in the memory 420. The data executes various functions of the terminal device 400 and processes data, so as to monitor the terminal device as a whole. Optionally, the processor 480 may include one or more processing units; preferably, the processor 480 may integrate an application processor and a modem processor, where the application processor mainly processes the operating system, user interface, and application programs, etc. , The modem processor mainly deals with wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 480. The processor 480 may be used to execute each step in the method embodiment of the present application.

The terminal device 400 also includes a power source 490 (such as a battery) for supplying power to various components. Preferably, the power source may be logically connected to the processor 480 through a power management system, so that functions such as charging, discharging, and power consumption can be managed through the power management system.

Although not shown, the terminal device 400 may also include a camera, a Bluetooth module, etc., which will not be repeated here.

It should be understood that “one embodiment” or “an embodiment” mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the appearance of "in one embodiment" or "in an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.

A person of ordinary skill in the art may be aware that the units and circuits of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed circuits, branches, and units may be implemented in other ways. For example, the branches described above are illustrative, for example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated into A branch or some features can be ignored or not implemented.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A fingerprint recognition method, characterized in that it comprises:

Obtain the pressing area of the finger in the fingerprint detection area;

Fingerprint recognition is performed on the reflected light of the finger received from the target light-emitting area of the display screen, and the target light-emitting area is determined according to the pressing area.
The method according to claim 1, wherein the acquiring the pressing area of the finger in the fingerprint detection area comprises:

In the case that the finger presses on the display screen, the pressing area is acquired according to the distribution of the data size received from the initial light-emitting area of the display screen, and the target light-emitting area is compared according to the pressing area Determined after the initial light-emitting area is adjusted.
The method according to claim 2, wherein when the finger is not fully pressed to the initial light-emitting area, the area of the initial light-emitting area is larger than the area of the target light-emitting area, and the target emits light The area of the area is greater than or equal to the area of the pressing area.
The method according to claim 2 or 3, wherein the brightness of the light emitted from the initial light-emitting area is less than the brightness of the light emitted from the target light-emitting area.
The method according to any one of claims 2 to 4, wherein the brightness of the light emitted from the initial light-emitting area is less than or equal to 200 nits; and/or the light emitted from the target light-emitting area The brightness is greater than or equal to 450 nits.
The method according to any one of claims 2 to 5, wherein the acquiring the pressing area of the finger in the fingerprint detection area comprises:

In the first scan mode, acquiring the pressing area;

The fingerprint recognition of the reflected light of the finger received from the target light-emitting area of the display screen includes:

In the second scan mode, fingerprint recognition is performed on the reflected light of the finger received from the target light-emitting area;

Wherein, the number of working pixels in the fingerprint detection area in the first scanning mode is smaller than the number of working pixels in the fingerprint detection area in the second scanning mode.
The method according to claim 6, wherein in the first scanning mode, at least one pixel is separated between any two working pixels in the fingerprint detection area; in the second scanning mode, All pixels in the fingerprint detection area start working at the same time.
The method according to claim 7, wherein, in the first scanning mode, there is an interval of 10 pixels between any two working pixels in the fingerprint detection area.
A fingerprint identification device, characterized in that the fingerprint identification device is arranged below the display screen, and the fingerprint identification device includes:

A processing unit for obtaining the pressing area of the finger in the fingerprint detection area;

The sensor unit is configured to perform fingerprint recognition on the reflected light of the finger received from the target light-emitting area of the display screen, the target light-emitting area being determined according to the pressing area.
The fingerprint identification device according to claim 9, wherein the processing unit is specifically configured to:

In the case that the finger presses on the display screen, the pressing area is acquired according to the distribution of the data size received from the initial light-emitting area of the display screen, and the target light-emitting area is compared according to the pressing area Determined after the initial light-emitting area is adjusted.
The fingerprint identification device according to claim 10, wherein when the finger does not fully press the initial light-emitting area of the display screen, the area of the initial light-emitting area is larger than the area of the target light-emitting area, The area of the target light-emitting area is greater than or equal to the area of the pressing area.
The fingerprint identification device according to claim 10 or 11, wherein the brightness of the light emitted from the initial light-emitting area is less than the brightness of the light emitted from the target light-emitting area.
The fingerprint identification device according to any one of claims 10 to 12, wherein the brightness of the light emitted from the initial light-emitting area is less than or equal to 200 nits; and/or, the light emitted from the target light-emitting area The brightness of the light is greater than or equal to 450 nits.
The fingerprint identification device according to any one of claims 10 to 13, wherein the processing unit is specifically configured to:

In the first scan mode, acquiring the pressing area;

The sensor unit is specifically used for:

In the second scan mode, fingerprint recognition is performed on the reflected light of the finger received from the target light-emitting area;

Wherein, the number of working pixels in the fingerprint detection area in the first scanning mode is smaller than the number of working pixels in the fingerprint detection area in the second scanning mode.
The fingerprint identification device according to claim 14, wherein in the first scanning mode, at least one pixel is spaced between any two working pixels in the fingerprint detection area; in the second scanning mode Next, all pixels in the fingerprint detection area start working at the same time.
15. The fingerprint identification device according to claim 15, wherein in the first scanning mode, there is an interval of 10 pixels between any two working pixels in the fingerprint detection area.
A terminal device, wherein the terminal device comprises the fingerprint identification device and a display screen according to any one of claims 9 to 16, and the fingerprint identification device is arranged under the display screen.
The terminal device according to claim 17, wherein the terminal device further comprises a processor, and the processor is configured to determine the target light emitting area according to the pressing area.