WO2020227986A1

WO2020227986A1 - Image collection apparatus and method, and electronic device

Info

Publication number: WO2020227986A1
Application number: PCT/CN2019/087093
Authority: WO
Inventors: 左勇
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2020-11-19
Also published as: CN111066027B; CN111066027A

Abstract

Provided in embodiments of the present application are an image collection apparatus and method, and an electronic device, which may reduce the amount of time required for collecting a fingerprint image in environments in which light is strong. The apparatus comprises: a light-splitting apparatus, which is used to divide an optical signal that carries fingerprint information into a plurality of optical signals; and a plurality of optical fingerprint sensors, which are used to collect a plurality of fingerprint images in parallel according to the plurality of optical signals respectively, the exposure time used by the plurality of optical fingerprint sensors to collect the fingerprint images being different.

Description

Image acquisition device, method and electronic equipment

Technical field

The embodiments of the present application relate to the field of image acquisition technology, and more specifically, to an image acquisition apparatus, method, and electronic equipment.

Background technique

With the rapid development of the terminal industry, people pay more and more attention to biometric technology, and the application of under-screen biometric identification technology, such as under-screen fingerprint identification technology, is more and more widespread.

In the process of collecting fingerprint images, when encountering a strong light environment, the problem of large area overexposure may occur. Traditional methods mainly solve this problem by reducing the exposure time and then taking another fingerprint image. However, taking one more fingerprint image will increase time-consuming.

Summary of the invention

The embodiments of the present application provide an image collection device, method, and electronic equipment, which reduce the time for collecting fingerprint images in a strong light environment.

In a first aspect, an image acquisition device is provided, which is suitable for electronic equipment with a display screen, and is characterized in that the device includes:

Spectroscopic device, used to divide the optical signal carrying fingerprint information into multiple optical signals;

The multiple optical fingerprint sensors are configured to collect multiple fingerprint images in parallel according to the multiple optical signals, wherein the multiple optical fingerprint sensors collect fingerprint images with different exposure times.

In some possible embodiments, the spectroscopic device is arranged between the display screen and the plurality of optical fingerprint sensors.

In some possible embodiments, the device further includes a processor configured to set the exposure time used by the multiple optical fingerprint sensors to collect fingerprint images.

In some possible embodiments, the processor is specifically configured to: set the exposure time according to the intensity of each optical signal in the multiple optical signals.

In some possible embodiments, the plurality of optical fingerprint sensors include a first optical fingerprint sensor and a second optical fingerprint sensor, and the intensity of the optical signal received by the first optical fingerprint sensor is greater than that of the second optical fingerprint sensor The intensity of the received light signal, the exposure time used by the first optical fingerprint sensor to collect the fingerprint image is less than the exposure time used by the second optical fingerprint sensor to collect the fingerprint image.

In some possible embodiments, the processor is further configured to: perform fingerprint recognition according to the multiple fingerprint images.

In some possible embodiments, the processor is specifically configured to: after the third optical fingerprint sensor of the plurality of optical fingerprint sensors collects the fingerprint image, according to the fingerprint image collected by the third optical fingerprint sensor, Perform fingerprint identification, wherein the exposure time used by the third optical fingerprint sensor to collect fingerprint images is the shortest among the exposure times used by the multiple optical fingerprint sensors to collect fingerprint images.

In some possible embodiments, the light splitting device is a beam splitter.

In some possible embodiments, the device further includes: an optical component, which is arranged between the display screen and the plurality of optical fingerprint sensors to transmit the optical signal reflected on the surface of the finger to the The photosensitive areas of the multiple optical fingerprint sensors are described.

In some possible embodiments, the spectroscopic device is arranged between the display screen and the optical assembly.

In a second aspect, an image acquisition method is provided, which is applied to an image acquisition device including a spectroscopic device and multiple optical fingerprint sensors, and the method includes:

The optical splitting device divides the optical signal carrying fingerprint information into multiple optical signals;

The multiple optical fingerprint sensors respectively collect multiple fingerprint images in parallel according to the multiple optical signals, wherein the multiple optical fingerprint sensors collect fingerprint images with different exposure times.

In some possible embodiments, the image capturing apparatus further includes a processor, and the method further includes: the processor setting the exposure time used by the multiple optical fingerprint sensors to capture fingerprint images.

In some possible embodiments, the processor setting the exposure time used by the multiple optical fingerprint sensors to collect fingerprint images includes: the processor setting the exposure time according to the intensity of each optical signal in the optical signal Exposure time.

In some possible embodiments, the method further includes: the processor performs fingerprint recognition according to the multiple fingerprint images.

In some possible embodiments, the processor performing fingerprint recognition based on the multiple fingerprint images includes: after a third optical fingerprint sensor in the multiple optical fingerprint sensors collects the fingerprint image, performing fingerprint recognition according to the The fingerprint image collected by the third optical fingerprint sensor is used for fingerprint recognition, wherein the exposure time used by the third optical fingerprint sensor to collect the fingerprint image is the shortest exposure time used by the multiple optical fingerprint sensors to collect the fingerprint image.

In some possible embodiments, the light splitting device is a beam splitter.

In a third aspect, an electronic device is provided, including a display screen and the first aspect or the image acquisition device in any possible implementation of the first aspect.

Based on the above technical solution, the optical signal carrying fingerprint information is divided into multiple optical signals by the light splitting device, and multiple optical fingerprint sensors collect fingerprint images in parallel according to the multiple optical signals with different exposure times, making it possible to compare Fingerprint images suitable for different light environments (including strong light environments) are collected in a short period of time, so that the time for collecting fingerprint images can be reduced.

Description of the drawings

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

Figure 2 is a schematic flow chart of a fingerprint image collection under a strong light environment.

Fig. 3 is a schematic diagram of an image acquisition device according to an embodiment of the present application.

Fig. 4 is a schematic flowchart of an optical fingerprint sensor collecting fingerprint images according to an embodiment of the present application.

Fig. 5 is a schematic flowchart of an image acquisition method according to an embodiment of the present application.

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

Detailed ways

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

It should be understood that the embodiments of this application can be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging. The embodiments of this application only take optical fingerprint systems as an example for description, but should not The embodiments of the application constitute any limitation, and the embodiments of the present application are also applicable to other systems using optical imaging technology.

As a common application scenario, the optical fingerprint system provided in the embodiments of this application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other terminal devices; more specifically, in the above-mentioned terminal devices, fingerprint identification The device may specifically be an optical fingerprint device, which may be arranged in a partial area or an entire area under the display screen, thereby forming an 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.

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 multiple There are two photodetectors distributed in an array, and the photodetectors can be used as the above-mentioned optical sensing unit.

The optical component 132 may be disposed above the sensing array of the light detecting part 134, which may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements. The filter layer may be used In order to filter out the ambient light penetrating the finger, the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the finger surface to the sensor 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. Because fingerprint ridges and valleys have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the reflected 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 specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and The sensing areas of the multiple optical fingerprint sensors collectively constitute 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 collection 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.

In the current technical solution, as shown in FIG. 2, when it is unknown whether the current is a strong light environment, the optical fingerprint sensor first uses the exposure time T1 to collect fingerprint images. After the optical fingerprint sensor is collected, if the processor detects that the current is a strong light environment, the optical fingerprint sensor can switch the exposure time to T2 to collect the fingerprint image again. Among them, T2 is less than T1.

In the entire process of collecting fingerprint images, T1 and T2 are executed sequentially, and the total collection time of the optical fingerprint sensor is T1+T2+judgment time. Among them, the judgment time is the time for the processor to judge whether the current is a strong light environment.

It can be seen that when in a strong light environment, the optical fingerprint sensor takes a long time to collect a fingerprint image and consumes a lot of time. In order to reduce the time-consuming collection of fingerprint data in a strong light environment, an embodiment of the present application proposes an image collection solution.

Optionally, the strong light environment in the embodiment of the present application can be understood as: the intensity (or light intensity) of the optical signal is greater than the threshold.

FIG. 3 shows a schematic diagram of an image acquisition device 300 according to an embodiment of the present application. It should be understood that, in the embodiment of the present application, the image acquisition device 300 may be a fingerprint recognition module, which corresponds to the optical fingerprint recognition device 130 in FIG. 1, or the image acquisition device 300 may also be an electronic fingerprint recognition module. Equipment, this embodiment of the application does not limit this.

As shown in FIG. 3, the image acquisition device 300 may include: a spectroscopic device 310 and a plurality of optical fingerprint sensors 320. Among them, the light splitting device 310 is used to divide the optical signal carrying fingerprint information into multiple optical signals, and the multiple optical fingerprint sensors 320 are used to collect multiple fingerprint images in parallel according to the multiple optical signals. Among them, multiple optical fingerprint sensors 320 The exposure time used to collect the fingerprint image is different.

In the embodiments of the present application, the optical fingerprint sensor 310 may also be referred to as a fingerprint sensor, a light sensor, a fingerprint sensor chip, a sensor chip, etc.

It should be understood that FIG. 3 is only a possible schematic diagram of the image acquisition device of the embodiment of the present application. In FIG. 3, there is one spectroscopic device 310 and two optical fingerprint sensors 320, but the embodiment of the present application is not limited to this. For example, the light splitting device 310 may be multiple light splitting devices.

Optionally, the light splitting device 310 may be a beam splitter, or may also be a prism or the like. If the beam splitter 310 is a beam splitter, when there is one beam splitter, the beam splitter can divide the optical signal carrying fingerprint information into two optical signals. Among them, a beam splitter may include two materials, one material allows the optical signal to be transmitted directly, and the other material allows the optical signal to be reflected.

Optionally, the spectroscopic device 310 may be arranged between the display screen and the multiple optical fingerprint sensors 320.

Optionally, in the embodiment of the present application, the image capture device 300 may further include: an optical component 330 for transmitting the light signal reflected on the surface of the finger to the photosensitive area of the plurality of optical fingerprint sensors 320.

At this time, the spectroscopic device 310 may be arranged between the display screen and the optical assembly 330. For example, when the optical component 330 includes a lens, the beam splitting device 310 may be disposed between the display screen and the lens.

It should be understood that the optical component 330 may correspond to the optical component 132 in the embodiment shown in FIG.

It should also be understood that the embodiment of the present application does not specifically limit the positions of the multiple optical fingerprint sensors 320, as long as the multiple optical fingerprint sensors 320 can receive optical signals. Exemplarily, multiple optical fingerprint sensors 320 may be placed in parallel, or may be placed in the manner shown in FIG. 3.

The multiple optical fingerprint sensors 320 collecting multiple fingerprint images in parallel according to multiple optical signals can be understood as: at least two of the multiple optical fingerprint sensors 320 partially overlap in time for collecting fingerprint images.

For example, the multiple optical fingerprint sensors 320 include three optical fingerprint sensors, namely, optical fingerprint sensor 1, optical fingerprint sensor 2, and optical fingerprint sensor 3. 1ms after the optical fingerprint sensor 1 starts to collect fingerprint images, the optical fingerprint sensor 2 starts to collect fingerprints After the optical fingerprint sensor 1 and the optical fingerprint sensor 2 have collected fingerprint images, the optical fingerprint sensor 3 starts to collect fingerprint images.

For another example, multiple optical fingerprint sensors 320 can simultaneously collect fingerprint images based on multiple optical signals. At this time, the time for the multiple optical fingerprint sensors 320 to collect fingerprint images is the longest exposure time. As shown in FIG. 4, the plurality of optical fingerprint sensors 320 includes a first optical fingerprint sensor 320(a) and a second optical fingerprint sensor 320(b). The exposure time used by the first optical fingerprint sensor 320(a) to collect fingerprint images Is T1, the exposure time used by the second optical fingerprint sensor 320(b) to collect fingerprint images is T2, T1>T2, the first optical fingerprint sensor 320(a) and the second optical fingerprint sensor 320(b) simultaneously collect fingerprint images At this time, the total time for the multiple optical fingerprint sensors 320 to collect fingerprint images is T1.

In this way, the total time for the multiple optical fingerprint sensors 320 to collect fingerprint images is the shortest.

Optionally, in some embodiments, the multiple optical signals may be light emitted from the same position of the finger, or light emitted from different positions of the finger, which is not specifically limited in the embodiment of the present application.

In the embodiment of the present application, the image capture device 300 may further include a processor 340 configured to set the exposure time used by the multiple optical fingerprint sensors 320 to capture fingerprint images.

The processor 340 may be a central processing unit (Central Processing Unit, CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), and ready-made programmable gate arrays (FPGA) Or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.

In a possible embodiment, the processor 340 may set the exposure time according to the intensity of each optical signal in the multiple optical signals. That is to say, the exposure time is related to the intensity of the light signal. If the intensity of the light signal is high, the exposure time is short; if the intensity of the light signal is small, the exposure time is long.

As shown in FIG. 3, the plurality of optical fingerprint sensors 320 includes a first optical fingerprint sensor 320(a) and a second optical fingerprint sensor 320(b). If the optical signal received by the first optical fingerprint sensor 320(a) is If the intensity is greater than the second optical fingerprint sensor 320(b), the exposure time used by the first optical fingerprint sensor 320(a) to collect the fingerprint image may be less than the exposure time used by the second optical fingerprint sensor 320(b) to collect the fingerprint image.

Optionally, in some embodiments, the processor 340 may train different exposure times for different light intensities. For example, when the light intensity is normal, the light intensity is strong, and the light intensity is weak, training different exposure times respectively. Then, the processor 340 may set different exposure times for the plurality of optical fingerprint sensors 320 based on the trained exposure time.

Optionally, the processor 340 may use a regression algorithm to train the exposure time. Among them, there may be many types of regression algorithms, and the embodiments of the present application are not specifically limited. Exemplarily, the regression algorithm may include, but is not limited to, least squares, logistic regression (LR), etc.

Optionally, in some embodiments, the processor may set the exposure time according to the proportional relationship of the multiple optical signals divided by the spectroscopic device 310.

Exemplarily, if the spectroscopic device 310 copies the optical signal carrying fingerprint information into multiple optical signals, the ratio between the multiple optical signals and the original optical signal is 1:1, and the processor 340 can directly follow the training obtained The exposure time sets different exposure times for the multiple optical fingerprint sensors 320. For example, in a strong light environment, the training exposure time is 3ms, and when the light intensity is normal, the training exposure time is 5ms. If the multiple optical fingerprint sensors 320 include two optical fingerprint sensors, the processor The exposure time set by 340 for the two optical fingerprint sensors can be 3ms and 5ms respectively.

For another example, if the plurality of optical fingerprint sensors 320 include two optical fingerprint sensors, and the beam splitter 310 is a beam splitter, the beam splitter divides the optical signal carrying fingerprint information into two optical signals, then the two optical signals The ratio relationship with the original light signal is 1:2, and when the processor 340 sets the exposure time for the two optical fingerprint sensors, it can be halved on the basis of the exposure time obtained by training. For example, in a strong light environment, the training exposure time is 3ms, and when the light intensity is normal, the training exposure time is 5ms, then the processor 340 can set the exposure time for the two optical fingerprint sensors separately It is 1.5ms and 2.5ms.

After the multiple optical fingerprint sensors 320 have collected fingerprint images according to the set exposure time, the processor 340 may also be used to perform fingerprint recognition based on the multiple fingerprint images.

As an example, the processor 340 may perform fingerprint recognition based on the multiple fingerprint images after all the optical fingerprint sensors in the multiple optical fingerprint sensors 320 have collected fingerprint images.

Optionally, after all the optical fingerprint sensors have collected fingerprint images, the processor 340 may randomly select the fingerprint images from the multiple fingerprint images for fingerprint identification.

Optionally, after all the optical fingerprint sensors have collected fingerprint images, the processor 340 may perform fingerprint recognition in the order in which the fingerprint images are acquired. For example, the processor 340 sequentially obtains fingerprint image 1, fingerprint image 2, and fingerprint image 3. The processor 340 may first perform fingerprint recognition based on the fingerprint image 3. If the recognition fails, the processor 340 performs fingerprint recognition based on the fingerprint image 2; Alternatively, the processor 340 may perform fingerprint recognition according to the fingerprint image 1 first, and if the recognition fails, the processor 340 performs fingerprint recognition according to the fingerprint image 2 again.

As another example, the processor 340 may perform fingerprint recognition according to the fingerprint image collected by any optical fingerprint sensor among the plurality of optical fingerprint sensors 320 after collecting the fingerprint image. That is, the processor 340 may perform fingerprint recognition according to the order of the exposure time used by the multiple optical fingerprint sensors 320 to collect fingerprint images. The fingerprint image used by the processor 340 for fingerprint recognition first may correspond to the smallest exposure time. Fingerprint image collected by the optical fingerprint sensor.

For example, the plurality of optical fingerprint sensors 320 includes a first optical fingerprint sensor, a second optical fingerprint sensor, and a third optical fingerprint sensor. The first optical fingerprint sensor, the second optical fingerprint sensor, and the third optical fingerprint sensor collect fingerprint images. The exposure time used is sequentially reduced. After the fingerprint image is collected by the third optical fingerprint sensor, the processor 340 may perform fingerprint recognition according to the fingerprint image collected by the third optical fingerprint sensor. If the fingerprint recognition by the processor 340 is successful, the recognition process ends, and the first optical fingerprint sensor and the second optical fingerprint sensor stop collecting fingerprint images. If the fingerprint recognition by the processor 340 fails, the processor 340 may perform fingerprint recognition according to the fingerprint image collected by the second optical fingerprint sensor after the fingerprint image is collected by the second optical fingerprint sensor.

It should be understood that in the embodiments of the present application, "first", "second" and "third" are only used to distinguish different objects, but do not limit the scope of the embodiments of the present application.

As another example, the processor 340 may use the fingerprint image collected by the optical fingerprint sensor 1 to perform fingerprint identification after the optical fingerprint sensor (such as the optical fingerprint sensor 1) corresponding to the default exposure time has collected the fingerprint image. If the fingerprint identification is successful, the identification process ends; if the fingerprint identification fails, the processor 340 continues to perform fingerprint identification.

The embodiment of the present application does not limit the implementation manner of the processor 340 continuing to perform fingerprint recognition. For example, the processor 340 may randomly select fingerprint images from the fingerprint images that have been obtained for fingerprint recognition; further illustratively, the processor 340 may After all optical fingerprint sensors have collected fingerprint images, fingerprint recognition is performed.

Optionally, the default exposure time may be the exposure time when the light intensity is normal.

It should be noted that, in addition to fingerprint recognition, the technical solutions of the embodiments of the present application can also perform other biometric recognition, such as face recognition, which is not limited in the embodiments of the present application.

It should also be noted that the image acquisition device 300 of the embodiment of the present application is not only suitable for a strong light environment, but also suitable for other scenes such as a low light environment and a dark environment.

In the embodiment of the present application, the optical signal carrying fingerprint information is divided into multiple optical signals by a spectroscopic device, and multiple optical fingerprint sensors collect fingerprint images in parallel according to the multiple optical signals at different exposure times, so that the Fingerprint images suitable for different light environments (including strong light environments) are collected in a short period of time, so that the time for collecting fingerprint images can be reduced.

The device embodiment of the present application is described in detail above with reference to FIGS. 3 and 4, and the method embodiment of the present application is described in detail below in conjunction with FIG. 5. It should be understood that the method embodiment and the device embodiment correspond to each other, and similar descriptions can be Refer to the device embodiment.

Fig. 5 shows a schematic flowchart of an image acquisition method according to an embodiment of the present application. The image acquisition method shown in FIG. 5 can be executed by the image acquisition device 300 in the foregoing embodiment. It should be understood that the steps or operations in FIG. 5 are only examples, and the embodiment of the present application may also perform other operations or variations of various operations in FIG. 5. In addition, each step in FIG. 5 may be performed in a different order from that shown in FIG. 5, and it is possible that not all operations in FIG. 5 are to be performed.

As shown in FIG. 5, the image acquisition method 500 may include the following steps:

S510: The optical splitting device divides the optical signal carrying fingerprint information into multiple optical signals.

S520. The multiple optical fingerprint sensors respectively collect multiple fingerprint images in parallel according to multiple optical signals, where the multiple optical fingerprint sensors collect fingerprint images with different exposure times.

Optionally, in some embodiments, the spectroscopic device is arranged between the display screen and the plurality of optical fingerprint sensors.

Optionally, in some embodiments, the image capture device 300 further includes a processor, and the method 500 further includes: the processor sets the exposure time used by the multiple optical fingerprint sensors to capture fingerprint images.

Optionally, in some embodiments, the processor setting the exposure time used by the multiple optical fingerprint sensors to collect the fingerprint image includes: the processor setting the exposure time according to the intensity of each optical signal in the optical signal.

Optionally, in some embodiments, the plurality of optical fingerprint sensors include a first optical fingerprint sensor and a second optical fingerprint sensor, and the intensity of the light signal received by the first optical fingerprint sensor is greater than the light received by the second optical fingerprint sensor. The intensity of the signal, the exposure time used by the first optical fingerprint sensor to collect the fingerprint image is shorter than the exposure time used by the second optical fingerprint sensor to collect the fingerprint image.

Optionally, in some embodiments, the method 500 further includes: the processor performs fingerprint recognition based on multiple fingerprint images.

Optionally, in some embodiments, the processor performs fingerprint recognition based on a plurality of fingerprint images, including: after a third optical fingerprint sensor of the plurality of optical fingerprint sensors collects the fingerprint image, collecting the fingerprint image according to the third optical fingerprint sensor Fingerprint image, fingerprint recognition, wherein the exposure time used by the third optical fingerprint sensor to collect the fingerprint image is the shortest among the exposure times used by the multiple optical fingerprint sensors to collect the fingerprint image.

Optionally, in some embodiments, the light splitting device is a beam splitter.

An embodiment of the present application also provides an electronic device 600. As shown in FIG. 6, the electronic device 600 may include a display screen 620 and the above-mentioned image acquisition device 610. The image acquisition device 610 may be the image acquisition device in the foregoing embodiment. The device 300 is arranged below the display screen 620. Wherein, as an optional embodiment, the display screen 620 has a self-luminous display unit, and the self-luminous display unit can be used as an excitation light source for the image acquisition device 610 for fingerprint detection. In addition, the image acquisition device 610 can be used to execute the content in the method embodiment shown in FIG. 5.

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

It should be understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. For example, the singular forms of "a", "above" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

A person of ordinary skill in the art may be aware that, in combination with the examples described in the embodiments disclosed herein, the units can be implemented by electronic hardware, computer software, or a combination of both, in order to clearly illustrate the interchangeability of hardware and software. In the above description, the composition and steps of each example have been described generally in terms of function. 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 system and device may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units 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 It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.

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

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

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 is essentially or the part that contributes to the existing technology, or all or 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 It includes several instructions 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 (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Anyone familiar with the technical field can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

An image acquisition device suitable for electronic equipment with a display screen, characterized in that the device includes:

Spectroscopic device, used to divide the optical signal carrying fingerprint information into multiple optical signals;

The multiple optical fingerprint sensors are configured to collect multiple fingerprint images in parallel according to the multiple optical signals, wherein the multiple optical fingerprint sensors collect fingerprint images with different exposure times.
The device according to claim 1, wherein the spectroscopic device is arranged between the display screen and the plurality of optical fingerprint sensors.
The device according to claim 1 or 2, wherein the device further comprises:

The processor is configured to set the exposure time used by the multiple optical fingerprint sensors to collect fingerprint images.
The device according to claim 3, wherein the processor is specifically configured to:

The exposure time is set according to the intensity of each optical signal in the multiple optical signals.
The device according to claim 4, wherein the plurality of optical fingerprint sensors comprise a first optical fingerprint sensor and a second optical fingerprint sensor, and the intensity of the optical signal received by the first optical fingerprint sensor is greater than that of the optical fingerprint sensor. The intensity of the optical signal received by the second optical fingerprint sensor, and the exposure time used by the first optical fingerprint sensor to collect the fingerprint image is less than the exposure time used by the second optical fingerprint sensor to collect the fingerprint image.
The device according to any one of claims 3 to 5, wherein the processor is further configured to:

Perform fingerprint recognition based on the multiple fingerprint images.
The device according to claim 6, wherein the processor is specifically configured to:

After the third optical fingerprint sensor of the plurality of optical fingerprint sensors collects the fingerprint image, perform fingerprint recognition according to the fingerprint image collected by the third optical fingerprint sensor, wherein the third optical fingerprint sensor collects the fingerprint image The used exposure time is the shortest among the exposure times used by the multiple optical fingerprint sensors to collect fingerprint images.
The device according to any one of claims 1 to 7, wherein the light splitting device is a beam splitter.
The device according to any one of claims 1 to 8, wherein the device further comprises:

The optical component is configured to be arranged between the display screen and the plurality of optical fingerprint sensors, so as to transmit the light signal reflected on the surface of the finger to the photosensitive area of the plurality of optical fingerprint sensors.
The device according to claim 9, wherein the spectroscopic device is arranged between the display screen and the optical assembly.
An image acquisition method applied to an image acquisition device including a spectroscopic device and multiple optical fingerprint sensors, characterized in that the method includes:

The optical splitting device divides the optical signal carrying fingerprint information into multiple optical signals;

The multiple optical fingerprint sensors respectively collect multiple fingerprint images in parallel according to the multiple optical signals, wherein the multiple optical fingerprint sensors collect fingerprint images with different exposure times.
The method according to claim 11, wherein the spectroscopic device is arranged between the display screen and the plurality of optical fingerprint sensors.
The method according to claim 11 or 12, wherein the image acquisition device further comprises a processor, and the method further comprises:

The processor sets the exposure time used by the plurality of optical fingerprint sensors to collect fingerprint images.
The method of claim 13, wherein the processor setting the exposure time used by the plurality of optical fingerprint sensors to collect fingerprint images comprises:

The processor sets the exposure time according to the intensity of each optical signal in the optical signal.
The method according to claim 14, wherein the plurality of optical fingerprint sensors comprise a first optical fingerprint sensor and a second optical fingerprint sensor, and the intensity of the optical signal received by the first optical fingerprint sensor is greater than that of the optical fingerprint sensor. The intensity of the optical signal received by the second optical fingerprint sensor, and the exposure time used by the first optical fingerprint sensor to collect the fingerprint image is shorter than the exposure time used by the second optical fingerprint sensor to collect the fingerprint image.
The method according to any one of claims 13 to 15, wherein the method further comprises:

The processor performs fingerprint recognition based on the multiple fingerprint images.
The method according to claim 16, wherein the processor performs fingerprint recognition according to the multiple fingerprint images, comprising:

After the third optical fingerprint sensor of the plurality of optical fingerprint sensors collects the fingerprint image, perform fingerprint recognition according to the fingerprint image collected by the third optical fingerprint sensor, wherein the third optical fingerprint sensor collects the fingerprint image The used exposure time is the shortest among the exposure times used by the multiple optical fingerprint sensors to collect fingerprint images.
The method according to any one of claims 11 to 17, wherein the light splitting device is a beam splitter.
An electronic device, characterized in that, the electronic device includes:

Display screen

The image acquisition device according to any one of claims 1 to 10.