WO2023284832A1

WO2023284832A1 - Optical fingerprint recognition apparatus, optical fingerprint recognition method, and electronic device

Info

Publication number: WO2023284832A1
Application number: PCT/CN2022/105747
Authority: WO
Inventors: 郑大峰; 杨子东
Original assignee: 维沃移动通信有限公司
Priority date: 2021-07-16
Filing date: 2022-07-14
Publication date: 2023-01-19
Also published as: CN113449685A

Abstract

An optical fingerprint recognition apparatus, an optical fingerprint recognition method, and an electronic device. The optical fingerprint identification apparatus comprises: a light sensing region, consisting of an array of a plurality of pixels, the plurality of pixels comprising a plurality of color pixels (22). Each color pixel (22) comprises: a microlens (221); a light absorbing layer (222) located below the microlens (221) and adapted to absorb light in a specific wavelength range, wherein the light absorbing layer (222) is a photoelectric conversion material layer capable of absorbing light in a determined wavelength range and converting the light into electrons; a sensing circuit (223) located below the light absorbing layer (222), a sensor being disposed on the sensing circuit (223) and configured to collect light transmitted from the light absorbing layer (222); a silicon substrate (224) located below the sensing circuit (223); and an insulating layer (225) located between the light absorbing layer (222) and the sensing circuit (223).

Description

Optical fingerprint identification device, optical fingerprint identification method, and electronic equipment

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202110805412.2 filed in China on July 16, 2021, the entire contents of which are hereby incorporated by reference.

technical field

The application belongs to the technical field of fingerprint identification, and in particular relates to an optical fingerprint identification device, an optical fingerprint identification method, and an electronic device.

Background technique

At present, mobile phones have become a universal consumer electronics product. With the development of full-screen technology, under-screen optical fingerprint recognition technology has been widely used. Optical fingerprint recognition technology usually uses an appropriate light source to irradiate the finger, and the peaks and troughs of the finger reflect the light emitted by the light source, and the fingerprint image is determined according to the difference in the reflected light. However, once criminals forge artificial fingerprints based on the texture information of fingerprints to pretend to be legitimate users for identity authentication, it will bring huge information security risks to users whose fingerprints are forged.

Currently, a method for identifying artificially forged fingerprints is known. In this method, the light emitted by the light source is irradiated on the target fingerprint and reflected, and the reflected light is filtered by a filter and then irradiated to the photosensitive area, and the photosensitive area collects spectral information of the filtered reflected light. Since there is a huge difference between the spectral information of the light reflected from the skin of a living finger and the spectral information of the light reflected from an artificially forged fingerprint, it is possible to distinguish whether the target fingerprint is a living fingerprint or an artificially forged fingerprint according to the spectral information of the reflected light.

FIG. 1 shows the structure of a photosensitive area of an optical fingerprint identification chip known to the applicant. As shown in FIG. 1 , the photosensitive area 11 of the fingerprint chip 10 includes a pixel array composed of a plurality of color pixels 12 and a plurality of sensing pixels 13 .

Referring to FIG. 2A , the color pixel 12 includes: a microlens 121 , a color layer 122 below the microlens, a sensing circuit 123 below the color layer, and a silicon substrate 124 below the sensing circuit. For pixels 12 of different colors, the color layers 122 thereof can be set to have different colors, usually red, green, and blue. The light reflected from the finger where the target fingerprint is located passes through the microlens 121 and then irradiates onto the color layer 122 . The light of the same color as the color layer 122 in the reflected light passes through this layer, irradiates on the sensing circuit 123 and is collected by the sensor on the sensing circuit, so as to obtain spectral information for the color. Finger spectral information can be obtained by synthesizing spectral information for different colors collected by multiple pixels 12 of different colors. The finger spectrum information can be used to judge whether the target fingerprint is a live fingerprint or an artificially forged fingerprint.

Referring to FIG. 2B , the sensing pixel 13 includes: a microlens 131 , a protective layer 132 under the microlens, a sensing circuit 133 under the protective layer, and a silicon substrate 134 under the sensing circuit. The light reflected from the target fingerprint passes through the microlens 131 and the protective layer 132 and then irradiates onto the sensing circuit 132 and is collected by the sensor on the sensing circuit. Combining the optical signals collected by multiple sensing pixels 13 can obtain the texture information of the target fingerprint.

The fingerprint chip 10 can collect both the texture information and the spectrum information of the finger, so it has a certain ability to distinguish whether the target fingerprint is a living fingerprint. However, this existing fingerprint chip has the following disadvantages.

The color layer of an existing color pixel is a photoresist coating that only allows light of a specific wavelength to pass through. Moreover, the colors of the color layer are limited, usually only including red, green, and blue. This results in a limited spectral range that can be identified by a single or even all color pixels, and sometimes even filters out the light of the optimal (for example, the highest light intensity) wavelength, resulting in poor quality of the synthesized finger spectrum.

In addition, the existing color layer is usually a photoresist material, which only allows light in a specific wavelength band to pass through, so the light transmittance is poor. FIG. 2C shows a schematic diagram of a spectral curve 200 detected by a conventional color pixel, from which it can be seen that when the reflected light passes through the color layer, most of the light will be absorbed by the color layer. Therefore, the sensor on the sensing circuit under the color layer cannot obtain sufficient energy to form a fingerprint road image within the exposure time range of the fingerprint chip. Therefore, the color pixels of the existing fingerprint chip cannot be used to detect the texture information of the target fingerprint. In other words, the photosensitive area of the existing fingerprint chip cannot actually detect the complete fingerprint road image, but the detected texture image needs to be repaired through post-processing software. This results in poor quality of the resulting fingerprint roadmap image.

On the other hand, for the limited photosensitive area of the fingerprint chip, there is a contradiction between the number allocation of color pixels and sensing pixels. In order to obtain a better finger spectrum, it is generally desirable to arrange more color pixels. In order to obtain a more complete fingerprint image, it is generally desirable to arrange more sensing pixels. Finding a suitable compromise between the above two is often difficult.

Contents of the invention

An object of the present application is to provide an optical fingerprint identification device to solve or at least alleviate one or more of the above-mentioned deficiencies in the prior art.

Another object of the present application is to provide an optical fingerprint identification method to solve or at least alleviate one or more deficiencies in the above-mentioned prior art.

Another object of the present application is to provide an electronic device to solve or at least alleviate one or more of the above-mentioned deficiencies in the prior art.

In order to solve the above technical problem, according to one aspect of the present application, an optical fingerprint identification device is provided, which includes: a photosensitive area, which is composed of an array of multiple pixels, and the multiple pixels include multiple color pixels. The color pixel includes: a microlens; a light-absorbing layer located below the micro-lens, the light-absorbing layer being a photoelectric conversion material layer capable of absorbing light in a predetermined wavelength range and converting it into electrons; a sensing circuit located below the light-absorbing layer The sensing circuit is provided with a sensor for collecting light passing through the light-absorbing layer; a silicon substrate is located under the sensing circuit; and an insulating layer is located between the light-absorbing layer and the sensing circuit.

According to one aspect of the present application, there is also provided an optical fingerprint identification method realized by the optical fingerprint identification device according to the present application. The method includes a fingerprint entry step and a fingerprint identification step. The fingerprint entry step includes: using the color pixels to collect reflected light from the first target finger, wherein light in a predetermined wavelength range in the reflected light is absorbed by the light-absorbing layer and converted into electrons, while light in the remaining wavelength range passes through passing through the light absorbing layer and being collected by the sensor of the sensing circuit; using the reflected light collected by the color pixels to generate first finger spectral information; and storing the first finger spectral information. The fingerprint identification step includes: using the color pixels to collect reflected light from the second target finger, wherein light in a predetermined wavelength range in the reflected light is absorbed by the light-absorbing layer and converted into electrons, while light in the remaining wavelength range passes through pass through the light absorbing layer and be collected by the sensor of the sensing circuit; use the reflected light collected by the color pixels to generate second finger spectral information; combine the second finger spectral information with the stored comparing the spectrum information of the first finger; and when the two do not match, the second target finger is identified as invalid.

According to one aspect of the present application, an electronic device is provided, which includes the optical fingerprint identification device according to the present application.

According to one aspect of the present application, a readable storage medium is provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the above-mentioned optical fingerprint identification method are realized.

According to one aspect of the present application, a chip is provided, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to realize the above-mentioned optical fingerprint Identify the steps of the method.

According to one aspect of the present application, a computer program/program product is provided, the computer program/program product is stored in a non-volatile storage medium, and the program/program product is executed by at least one processor to implement the above The steps of the optical fingerprint identification method described above.

According to one aspect of the present application, there is provided an electronic device configured to execute the steps of the above optical fingerprint identification method.

In this application, the light-absorbing layer is used to replace the photoresistive color layer in the traditional color pixel, so that the same color pixel can collect light in more wavelength ranges, and the finally collected light intensity is thus significantly improved. Compared with the spectral curve detected by conventional color pixels, the spectral curve detected according to the present application has higher light intensity in a wider wavelength range. In other words, the light transmittance of the light-absorbing layer of the present application is far superior to that of traditional photoresistive color coatings. On the one hand, this can improve the quality of the collected spectral information. On the other hand, the color pixels of the present application are not only suitable for obtaining finger spectral information, but also suitable for obtaining finger fingerprint information.

Description of drawings

The present application will be described in detail below in conjunction with the accompanying drawings and detailed implementation methods, wherein:

Fig. 1 shows the structure of a kind of optical fingerprint recognition chip;

FIG. 2A is a schematic structural diagram of a color pixel in FIG. 1;

FIG. 2B is a schematic structural diagram of the sensor pixel in FIG. 1;

Fig. 2C is a schematic diagram of the spectrum curve detected by the color pixels in Fig. 2A;

Fig. 3 shows an optical fingerprint identification device according to an embodiment of the present application;

Fig. 4 is a schematic structural diagram of the color pixel in Fig. 3;

Fig. 4A is a schematic diagram of the spectrum curve detected by the color pixels in Fig. 4;

FIG. 5 is a schematic structural diagram of the sensing pixel in FIG. 3;

Fig. 6 shows an optical fingerprint identification device according to another embodiment of the present application;

Fig. 7 shows an optical fingerprint identification device according to another embodiment of the present application;

Fig. 8 shows an optical fingerprint recognition method according to an embodiment of the present application;

Fig. 9 shows a schematic diagram of the process of acquiring finger spectral information according to an embodiment of the present application;

FIG. 10A and FIG. 10B respectively show a fingerprint entry step and a fingerprint recognition step according to another embodiment of the present application;

FIG. 11A and FIG. 11B respectively show a fingerprint entry step and a fingerprint recognition step according to yet another embodiment of the present application;

FIG. 12A and FIG. 12B respectively show a fingerprint entry step and a fingerprint recognition step according to another embodiment of the present application; and

FIG. 13 is a schematic diagram of a hardware structure of an electronic device according to an embodiment of the present application.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the application can be practiced in sequences other than those illustrated or described herein. In addition, "and/or" in the specification and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

The optical fingerprint identification device and method according to the present application will be described in detail below through specific embodiments and application scenarios with reference to the accompanying drawings.

FIG. 3 shows an optical fingerprint identification device 20 according to an embodiment of the present application, which may be, for example, an optical fingerprint identification chip. As shown in FIG. 3 , the optical fingerprint identification device 20 includes a photosensitive area 21 composed of a plurality of pixel arrays. The pixels in the photosensitive area 21 include a plurality of color pixels 22 . As shown in FIG. 4 , each color pixel 22 may include: a microlens 221 , a light absorbing layer 222 under the microlens 221 , a sensing circuit 223 under the light absorbing layer 222 , and a silicon substrate 224 under the sensing circuit 223 . A sensor such as a light receiver is disposed on the sensing circuit 223 for collecting the light transmitted from the light absorbing layer 222 . According to the present application, the screen of the electronic device can be used as the light emitting unit, or a separate light emitting unit can also be provided.

The light-absorbing layer 222 is suitable for absorbing light in a specific wavelength range, for example, it can be made of a photoelectric conversion material layer for light in a specific wavelength range (band) using the principle of photoelectric conversion. This photoelectric conversion material layer has the ability to absorb light in this specific wavelength range and convert it into electrons. In one example, optoelectronic materials for specific light bands can be added to the color solution in the form of dyes to form a color paint. Then, the color paint is applied to an appropriate position of the photosensitive region 21 , such as the sensing circuit 223 of the color pixel 22 , through the chip manufacturing process. Preferably, the color pixel 22 further includes an insulating layer 225 between the light absorbing layer 222 and the sensing circuit 223 , so as to prevent the electrons generated by the light absorbing layer 222 from interfering with the sensing circuit 223 .

In this application, the light-absorbing layer is used to replace the photoresistive color layer in the traditional color pixel, so that the same color pixel can collect light in more wavelength ranges, and the finally collected light intensity is thus significantly improved. FIG. 4A shows a schematic diagram of a spectral curve 400 detected by a color pixel according to an embodiment of the present application. Compared with the spectral curve 200 detected by the conventional color pixel shown in FIG. 2C , the spectral curve 400 detected according to the present application has higher light intensity in a wider wavelength range. In other words, the light transmittance of the light absorbing layer of the present application is much better than that of the traditional photoresist color layer. On the one hand, this can improve the quality of the collected spectral information. On the other hand, the color pixels of the present application are not only suitable for obtaining finger spectral information, but also suitable for obtaining finger fingerprint information.

Returning to FIG. 3 , optionally or additionally, the pixels in the photosensitive area 21 may also include one or more sensing pixels 23 suitable for collecting fingerprint path information. As shown in FIG. 5 , the sensing pixel 23 includes: a microlens 231 , a protection layer 232 under the microlens, a sensing circuit 233 under the protection layer, and a silicon substrate 234 under the sensing circuit. The working principle of the sensing pixel 23 is similar to that of the existing sensing pixel 13 and will not be repeated here.

In the example shown in FIG. 3 , the color pixels 22 are arranged in the peripheral area of the photosensitive area 21 (for example, arranged in one or more rows), and the sensing pixels 23 are arranged in the middle area of the photosensitive area 21 . Generally speaking, the quality of the fingerprint path information obtained by using the pixels around the photosensitive area is low, and basically has no effect on the finger spectrum information. This arrangement of the present application concentrates the sensing pixels suitable for obtaining fingerprint path information in the middle of the photosensitive area, and arranges the color pixels suitable for obtaining finger spectral information on the periphery of the photosensitive area, which substantially improves the quality of optical fingerprints. Identify the effective use area of the device.

According to an embodiment of the present application, the plurality of color pixels 22 are divided into a plurality of different types according to the wavelength range of light absorbed by their respective light absorbing layers 222 . The light absorbing layers of the same type of color pixels absorb the same wavelength range of light, while the light absorbing layers of different types of color pixels absorb different wavelength ranges of light.

In the example shown in FIG. 3 , the color pixels 22 are divided into color pixels 22R (identified by R in the figure) for absorbing red light according to the wavelength range of the light absorbed by their respective light-absorbing layers 222. The color pixel 22B (marked by B in the figure) for absorbing blue light, the color pixel 22G (marked by G in the figure) for absorbing green light, and the color pixel 22Y (marked by Y in the figure) for absorbing yellow light . It should be understood that, according to the present application, the color pixels in the photosensitive area may have other arrangements, and may have more or less types and are not limited to the types mentioned herein. In the light sensing area, different types of color pixels may be arranged alternately and/or at intervals. The arrangement of some or all of the pixels of multiple colors may follow a consistent pattern, or follow different patterns, or be arranged randomly.

FIG. 6 shows an optical fingerprint identification device 30 according to another embodiment of the present application, which includes a photosensitive area 31 composed of a plurality of pixel arrays. The array of pixels is all composed of color pixels 32 . The structure of the color pixel 32 is the same as that of the color pixel 22 described above, and will not be repeated here. The optical fingerprint identification device 30 shown in FIG. 6 can use color pixels to collect finger spectral information and fingerprint path information. On the one hand, the acquisition ability of finger spectrum information and fingerprint path information is improved. On the other hand, the contradiction between the number of pixels for collecting finger spectrum information and the number of pixels for collecting fingerprint path information in the prior art is overcome.

In the example shown in FIG. 6 , the color pixels 32 are divided into color pixels 32R (identified by R in the figure) for absorbing red light according to the wavelength ranges of light absorbed by their respective light-absorbing layers, A color pixel 32B for absorbing blue light (marked by B in the figure), a color pixel 32G for absorbing green light (marked by G in the figure), and a color pixel 32Y for absorbing yellow light (marked by Y in the figure). It should be understood that, according to the present application, the color pixels in the photosensitive area may have other arrangements, and may have more or less types and are not limited to the types mentioned herein. In the light sensing area, different types of color pixels may be arranged alternately and/or at intervals. The arrangement of some or all of the pixels of multiple colors may follow a consistent pattern, or follow different patterns, or be arranged randomly.

FIG. 7 shows an optical fingerprint identification device 40 according to yet another embodiment of the present application, which includes a photosensitive area 41 composed of an array of multiple color pixels 42 and multiple sensing pixels 43 . The structures of the color pixels 42 and the sensing pixels 43 are the same as those of the color pixels 22 and the sensing pixels 23 described above, and will not be repeated here.

In the example shown in FIG. 7 , a plurality of color pixels 42 are dispersedly arranged in the pixel array of the photosensitive area 41 . Optionally, the light sensing area 41 is divided into a plurality of color sensing areas 41 a, and these color sensing areas 41 a are dispersedly arranged in the light sensing area 41 . One or more color pixels 42 are arranged in each color sensing area 41a. The sensing pixels 43 are arranged outside the color sensing area 41 a in the light sensing area 41 . In the example shown in FIG. 7, each color sensing region 41a includes a color pixel 42R (identified by R in the figure) for absorbing red light, a color pixel 42B (identified by B in the figure) for absorbing blue light, A color pixel 42G for absorbing green light (marked by G in the figure), and a color pixel 42Y for absorbing yellow light (marked by Y in the figure).

With this arrangement, when the finger is pressed, the red, blue, green and yellow spectral information of the finger skin is collected at the same time, and the spectral curve of the finger skin is fitted by an algorithm; this scheme can effectively improve the skin spectrum when the fingerprint is pressed. The ability to collect and improve the ability of fingerprints to prevent fake fingerprints. In addition, in the process of fingerprint recognition under the screen, the finger and the working environment are relatively stable, so the reflection spectrum of the finger is relatively stable. The color pixels are arranged in a dispersed manner, so that the fingers do not cover all the pixel arrays, and spectral information of the fingers meeting requirements can also be obtained.

However, it should be understood that, according to the present application, the color pixels in the color sensing area may have other arrangements, and may have more or less types and are not limited to the types mentioned herein. In the light sensing area, different color sensing areas may have the same or different numbers (even single), and/or the same or different types of color pixels. The arrangement of some or all of the color pixels in the color sensing area may follow a consistent rule, or follow different rules, or be arranged randomly. The arrangement of part or all of the color sensing areas in the photosensitive area can follow a consistent rule, or follow different rules, or be arranged randomly.

It should be understood that the optical fingerprint identification device in the embodiment of the present application may be a device, or a component, an integrated circuit, or a chip in a terminal. The device may be a mobile electronic device or a non-mobile electronic device, or may be a part of a mobile electronic device or a non-mobile electronic device. Exemplary, the mobile electronic device can be a mobile phone, a tablet computer, a notebook computer, a handheld computer, a vehicle electronic device, a wearable device, an ultra-mobile personal computer (Ultra-Mobile Personal Computer, UMPC), a netbook or a personal digital assistant (Personal Digital Assistant). Assistant, PDA), etc., non-mobile electronic devices can be servers, network attached storage (Network Attached Storage, NAS), personal computer (Personal Computer, PC), television (Television, TV), teller machine or self-service machine, etc., this application Examples are not specifically limited.

The optical fingerprint identification device in the embodiment of the present application may be a device with an operating system. The operating system may be an Android (Android) operating system, an IOS operating system, or other possible operating systems, which are not specifically limited in this embodiment of the present application.

In the following, the optical fingerprint identification method according to the present application will be described with reference to FIGS. 8-12B and in combination with the structure of the optical fingerprint identification device according to an embodiment of the present application. It should be understood that the optical fingerprint identification method of the present application is applicable to the optical fingerprint identification device according to other embodiments of the present application. According to the optical fingerprint identification method of the present application, its executing subject may be an electronic device, an optical fingerprint identification device, or a control module in the device for executing the method of the present application.

Fig. 8 shows an optical fingerprint recognition method according to an embodiment of the present application, including a fingerprint entry step (step S13) and a fingerprint recognition step (step S15). The fingerprint entry step S13 includes: using color pixels 22 to collect reflected light from the user's target finger (ie, the first target finger) (step S131), wherein light in a predetermined wavelength range in the reflected light is absorbed by the light-absorbing layer and converted into electrons, while the light in the remaining wavelength ranges passes through the light-absorbing layer and is collected by the sensor of the induction circuit; then, the spectral information of the target finger is generated by using the collected reflected light, that is, the first finger spectral information (step S132); finally, Store the spectral information of the first finger (step S133). Fingerprint identification step S15 includes: after fingerprint identification is started, use color pixels 22 to collect reflected light from the current target finger (i.e., second target finger) (step S151), wherein light in a predetermined wavelength range in the reflected light is captured by The light-absorbing layer absorbs and converts electrons, and the light in the remaining wavelength range passes through the light-absorbing layer and is collected by the sensor of the sensing circuit; then, the spectral information of the current finger is generated by using the collected reflected light, that is, the second finger spectral information (step S152); then, compare the second finger spectral information with the stored first finger spectral information (step S153); when the two do not match, the current target finger is identified as invalid (step S154), such as non Living finger/fingerprint, or artificially forged fingerprint; when the two match, follow-up processing (step S155).

Existing fingerprint entry methods generally include multiple entries, that is, fingers are lifted and lowered repeatedly. In combination with this entry method, according to an embodiment of the present application, the step S131 of using color pixels to collect reflected light from the first target finger may include multiple collections, one collection for each entry. Next, the spectral information of the reflected light obtained from each collection is fitted to obtain the spectral information of the first finger.

Fig. 9 shows a schematic diagram of a process of acquiring finger spectrum information according to an embodiment of the present application. In the process of fingerprint recognition under the screen, the finger and the working environment are relatively stable, so the reflection spectrum of the finger is relatively stable. In one acquisition, the light rays reaching the light-absorbing layers of each color have a spectrum of 500, for example. The light rays passing through the light-absorbing layers of the

color pixels

22R, 22Y, and 22G have

spectra

510, 520, and 530, respectively. The spectra collected by pixels of different colors are considered comprehensively, and finally the finger spectrum curve 590 is formed by fitting. It can be seen that, compared with the spectrum collected by a single color pixel, the obtained finger spectral curve 590 has a higher degree of recognition in a larger wavelength range. Taking multiple acquisitions into consideration, the resulting finger spectrum curve has a higher degree of recognition and greater intensity.

According to an embodiment of the present application, an optional or alternative fingerprint entry step S23 is provided, as shown in FIG. 10A, which adds the method of using color pixels to enter the fingerprint path on the basis of the fingerprint entry step S13 described above. information process. Specifically, it includes: using the reflected light collected by the color pixel 22 in step S131 to generate at least part of the user's fingerprint path information, that is, the first fingerprint path information (step S231); then, storing the generated second fingerprint path information. One-fingerprint road information (step S232). Compared with the color pixels in the prior art, the light transmittance of the color pixels according to the present application has been greatly improved, and has the ability to sense fingerprint lines of fingers. However, due to the existence of the light-absorbing layer, the light transmittance of the color pixel of the present application is still lower than that of the sensing pixel (the protective layer of the sensing pixel may not cause loss of light transmittance). Preferably, the transmittance loss caused by the light-absorbing layer of the color pixel can be compensated, for example, by a software algorithm. For example, the light transmittance of the color pixel with the light absorbing layer can be measured first, and then the ratio between the light transmittance of the color pixel with the light absorbing layer and the light transmittance of the pixel without the light absorbing layer can be determined, and then The light intensity collected by the corresponding color pixel is amplified correspondingly by using the ratio. Thus, the image information collected by the color pixels can be enhanced to further optimize the imaging effect of the color pixels. It should be understood that the light transmittance of the color pixels of the present application may be compensated by any known compensation scheme. Through compensation, the difference in light transmittance among the color pixels and between the color pixels and the sensing pixels is weakened or even eliminated.

Correspondingly, the present application provides an optional or alternative fingerprint recognition step S25, as shown in FIG. 10B , which adds the method of using color pixels to recognize fingerprint path information on the basis of the fingerprint recognition step S15 described above. process. Specifically, it includes: using the reflected light collected by the color pixel 22 in step S151 to generate at least part of the fingerprint path information, that is, the second fingerprint path information (step S251); The fingerprint path information is compared with the stored first fingerprint path information (step S252). When the two do not match, the second target finger is identified as invalid (step S253), such as a non-living finger/fingerprint, or an artificially forged fingerprint. After comparing in step S153, it is judged that the second finger spectrum information matches the stored first finger spectrum information, and after comparing in step S252, it is judged that the second finger fingerprint path information matches the stored first finger fingerprint path information. When the information matches, the second target finger is recognized as valid (step S254). In this way, by using the color pixels of the present application, not only the input and identification of finger spectral information, but also the input and identification of finger fingerprint information can be realized.

According to another embodiment of the present application, another optional or alternative fingerprint entry step S33 is provided, as shown in FIG. 11A , which increases the use of sensing pixels 23 The process of entering fingerprint information. Specifically, it includes: using the sensing pixels 23 to collect reflected light from the first target finger (step S331); then, using the collected reflected light to generate at least part of the fingerprint path information of the first finger (step S332); finally, Store the generated first finger fingerprint path information (step S333).

Correspondingly, the present application provides an optional or alternative fingerprint recognition step S35, as shown in FIG. 11B , which adds the method of using sensing pixels to recognize fingerprint path information on the basis of the fingerprint recognition step S15 described above. process. Specifically, it includes: using the sensing pixels 23 to collect reflected light from the second target finger (step S351); then, using the collected reflected light to generate at least part of the fingerprint path information of the second finger (step S352); then, Comparing the generated path information of the second fingerprint with the stored path information of the first fingerprint (step S353). When the two do not match, the second target finger is identified as invalid (step S354), such as a non-living finger/fingerprint, or artificially forged fingerprint. After comparing in step S153, it is determined that the second finger spectrum information matches the stored first finger spectrum information, and in step S353, it is determined that the second finger fingerprint path information matches the stored first finger fingerprint path information When matched, the second target finger is recognized as valid (step S355).

According to yet another embodiment of the present application, an optional or alternative fingerprint entry step S43 is provided, as shown in FIG. 12A , which increases the use of color pixels 22 and The sensing pixels 23 jointly record the process of fingerprint path information. Specifically, it includes: using the sensing pixel 23 to collect reflected light from the first target finger (step S431); The reflected light is fitted to generate the first fingerprint path information (step S432); finally, the generated first fingerprint path information is stored (step S433).

Correspondingly, the present application provides an optional or alternative fingerprint recognition step S45, as shown in FIG. 12B , which adds the use of color pixels 22 and sensing pixels 23 on the basis of the previously described fingerprint recognition step S15. The process of identifying fingerprint information. Specifically, it includes: using the sensing pixel 23 to collect reflected light from the second target finger (step S451); The collected reflected light is fitted to generate second fingerprint path information (step S452); then, the generated second fingerprint path information is compared with the stored first fingerprint path information (step S453). When the two do not match, the second target finger is identified as invalid (step S454), such as a non-living finger/fingerprint, or an artificially forged fingerprint. When it is judged that the second finger spectrum information matches the stored first finger spectrum information after the comparison in step S153, and when it is judged that the second finger fingerprint path information matches the stored first finger fingerprint path information after the step S453 comparison , the second target finger is recognized as valid (step S455).

The present application also provides an electronic device including the above-mentioned optical fingerprint identification device. In the embodiment of the present application, electronic devices include but are not limited to mobile phones, tablet computers, notebook computers, palmtop computers, vehicle terminals, wearable devices (such as bracelets, glasses), and pedometers. Alternatively, the electronic device may also be a television, a set-top box, a desktop computer, a computer monitor integrated with a computer, or other suitable electronic devices.

Fig. 13 shows a schematic diagram of a hardware structure of an electronic device 900 according to an embodiment of the present application. The electronic device 900 includes but not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909, a processor 910, and according to The optical fingerprint identification device of the present application is, for example, the optical fingerprint identification device 20 .

It should be understood that, in the embodiment of the present application, the radio frequency unit 901 can be used for receiving and sending signals during sending and receiving information or during a call. Specifically, the downlink data from the base station is received and processed by the processor 910; Uplink data is sent to the base station. Generally, the radio frequency unit 901 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 901 can also communicate with the network and other devices through a wireless communication system.

The electronic device provides users with wireless broadband Internet access through the network module 902, such as helping users send and receive emails, browse web pages, and access streaming media.

The audio output unit 903 may convert audio data received by the radio frequency unit 901 or the network module 902 or stored in the memory 909 into an audio signal and output as sound. Also, the audio output unit 903 may also provide audio output (eg, call signal reception sound, message reception sound, etc.) related to a specific function performed by the electronic device 900 . The audio output unit 903 includes a speaker, a buzzer, a receiver, and the like.

The input unit 904 is used to receive audio or video signals. It should be understood that, in the embodiment of the present application, the input unit 904 may include a graphics processor (Graphics Processing Unit, GPU) 9041 and a microphone 9042, and the graphics processor 9041 is used for the image capture device ( Such as the image data of the still picture or video obtained by the camera) for processing.

The electronic device 900 also includes at least one sensor 905, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 9061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 9061 and the / or backlighting. As a kind of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (usually three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used to identify the attitude of electronic equipment () such as horizontal and vertical screen switching, related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, knocking), etc.; sensor 905 can also include fingerprint sensor, pressure sensor, iris sensor, molecular sensor, gyroscope, barometer, hygrometer, thermometer , infrared sensor, etc., which will not be repeated here.

The display unit 906 is used to display information input by the user or information provided to the user. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an organic light-emitting diode (Organic Light-Emitting Diode, OLED), or the like.

The user input unit 907 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the electronic device. Specifically, the user input unit 907 includes a touch panel 9071 and other input devices 9072 . The touch panel 9071, also referred to as a touch screen, can collect the user's touch operations on or near it (for example, the user uses any suitable object or accessory such as a finger, a stylus, etc. on the touch panel 9071 or near the touch panel 9071 operate). The touch panel 9071 may include two parts, a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, and joysticks, which will not be repeated here.

The interface unit 908 is an interface for connecting an external device to the electronic device 900 . For example, an external device may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, audio input/output (I/O) ports, video I/O ports, headphone ports, and more. The interface unit 908 can be used to receive input from an external device (for example, data information, power, etc.) Transfer data between external devices.

The memory 909 can be used to store software programs as well as various data. The memory 909 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of mobile phones (such as audio data, phonebook, etc.), etc. In addition, the memory 909 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, flash memory device, or other volatile solid-state storage devices.

The processor 910 is the control center of the electronic device, and uses various interfaces and lines to connect various parts of the entire electronic device, by running or executing software programs and/or modules stored in the memory 909, and calling data stored in the memory 909 , to perform various functions of the electronic equipment and process data, so as to monitor the electronic equipment as a whole. The processor 910 may include one or more processing units; preferably, the processor 910 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc., and the modem The processor mainly handles wireless communication. It can be understood that the foregoing modem processor may not be integrated into the processor 910 .

Those skilled in the art can understand that the electronic device 900 can also include a power supply (such as a battery) for supplying power to various components, and the power supply can be logically connected to the processor 910 through the power management system, so that the management of charging, discharging, and function can be realized through the power management system. Consumption management and other functions. The structure of the electronic device shown in FIG. 13 does not constitute a limitation to the electronic device of the present application. The electronic device according to the present application may include more or fewer components than shown in the illustration, or combine certain components, or arrange different components, I won't repeat them here.

The present application also provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, each process of the above embodiment of the optical fingerprint identification method can be realized, and the same To avoid repetition, the technical effects will not be repeated here.

Wherein, the processor is the processor in the electronic device described in the above embodiments. The readable storage medium includes computer readable storage medium, such as computer read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The present application also provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to realize the above-mentioned optical fingerprint identification method embodiments. process, and can achieve the same technical effect, in order to avoid repetition, it will not be repeated here.

It should be understood that the chips mentioned in the embodiments of the present application may also be called system-on-chip, system-on-chip, system-on-a-chip, or system-on-a-chip.

The present application also provides a computer program product, the computer program product is stored in a non-volatile storage medium, and the computer program product is executed by at least one processor to implement the processes of the above optical fingerprint identification method embodiments, And can achieve the same technical effect, in order to avoid repetition, no more details here.

The present application also provides an electronic device, which is configured to execute the various processes of the above-mentioned optical fingerprint identification method embodiment, and can achieve the same technical effect. To avoid repetition, details are not repeated here.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product in essence or the part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims

An optical fingerprint identification device, comprising:

The photosensitive area is composed of an array of multiple pixels, and the multiple pixels include a plurality of color pixels, and the color pixels include:

microlens;

A light-absorbing layer, located below the microlens, the light-absorbing layer is a photoelectric conversion material layer capable of absorbing light in a predetermined wavelength range and converting it into electrons;

The sensing circuit is located under the light-absorbing layer, and the sensing circuit is provided with a sensor for collecting light passing through the light-absorbing layer;

a silicon substrate positioned below the sensing circuit; and

The insulating layer is located between the light absorbing layer and the sensing circuit.
The optical fingerprint identification device according to claim 1, wherein the plurality of pixels further include a plurality of sensing pixels, and the sensing pixels include:

microlens;

a protective layer positioned beneath the microlenses and allowing light to pass through;

An induction circuit located under the protective layer, a sensor is arranged on the induction circuit for collecting light passing through the protective layer; and

A silicon substrate is disposed under the sensing circuit.
The optical fingerprint identification device according to claim 2, wherein the color pixels are arranged in a peripheral area of the photosensitive area, and the sensing pixels are arranged in a middle area of the photosensitive area.
The optical fingerprint identification device according to claim 2, wherein the color pixels are dispersedly arranged in the photosensitive area, and the photosensitive area is divided into a plurality of color sensing areas, and the color sensing areas are located in the photosensitive area. The sensing areas are distributed, wherein one or more color pixels are arranged in each color sensing area, and the sensing pixels are arranged outside the color sensing area in the light sensing area.
The optical fingerprint recognition device according to claim 1, wherein the photosensitive area is entirely composed of the plurality of color pixels.
The optical fingerprint identification device according to any one of claims 1-5, wherein the plurality of color pixels are divided into multiple different types according to the wavelength range of the light absorbed by the light absorbing layer,

The wavelength ranges of the light absorbed by the light-absorbing layers of the same type of color pixels are the same, while the wavelength ranges of the light absorbed by the light-absorbing layers of different types of color pixels are different,

Wherein different types of color pixels are arranged alternately and/or at intervals in the photosensitive area.
An optical fingerprint identification method realized by using the optical fingerprint identification device according to any one of claims 1-6, comprising:

Fingerprint entry steps, including:

Using the color pixels to collect reflected light from the first target finger, wherein light in a predetermined wavelength range in the reflected light is absorbed by the light-absorbing layer and converted into electrons, and light in the remaining wavelength range passes through the light-absorbing layer and collected by the sensor of the induction circuit;

generating first finger spectral information using reflected light collected by the color pixels; and

storing said first finger spectral information; and

Fingerprint identification steps, including:

Using the color pixels to collect reflected light from the second target finger, wherein light in a predetermined wavelength range in the reflected light is absorbed by the light-absorbing layer and converted into electrons, and light in the remaining wavelength range passes through the light-absorbing layer and collected by the sensor of the induction circuit;

generating second finger spectrum information by using the reflected light collected by the color pixels;

comparing the second finger spectral information with the stored first finger spectral information; and

When the two do not match, the second target finger is identified as invalid.
The method according to claim 7, wherein, in the fingerprint entry step, the step of collecting reflected light from the first target finger includes multiple collections; the step of generating spectral information of the first finger includes: The spectral information of the reflected light obtained in each collection is fitted to obtain the spectral information of the first finger.
The method according to claim 7, wherein the step of generating the first finger spectral information and/or generating the second finger spectral information comprises: fitting reflection spectral lines collected by a plurality of color pixels to form corresponding finger spectral information.
The method according to claim 7, wherein the method further comprises:

In the fingerprint entry step,

generating at least part of the first finger fingerprint path information using reflected light collected by the color pixels; and

storing the generated first-hand fingerprint information; and

In the fingerprint identification step,

generating at least part of the second finger fingerprint path information by using the reflected light collected by the color pixels;

Comparing the generated second fingerprint path information with the stored first fingerprint path information;

When the two do not match, the second target finger is identified as invalid; and

When the second finger spectrum information matches the stored first finger spectrum information and the generated second finger fingerprint information matches the stored first finger fingerprint information, the second target Fingers are recognized as valid.
The method according to claim 10, wherein the step of generating the first fingerprint path information and/or generating the second fingerprint path information comprises: compensating for the loss of transmittance caused by the light-absorbing layer of the color pixel.
The method according to any one of claims 7-11, wherein the plurality of pixels include one or more sensing pixels, and the sensing pixels include:

microlens;

a protective layer positioned beneath the microlenses and allowing light to pass through;

An induction circuit located under the protective layer, a sensor is arranged on the induction circuit for collecting light passing through the protective layer; and

a silicon substrate, disposed below the sensing circuit,

The methods described therein include:

In the fingerprint entry step,

collecting reflected light from the first target finger by using the sensing pixels;

generating at least part of the first finger fingerprint path information by using reflected light collected by the sensing pixels; and

storing the generated first-hand fingerprint information; and

In the fingerprint identification step,

collecting reflected light from the second target finger by using the sensing pixels;

generating at least part of the second finger fingerprint path information by using the reflected light collected by the sensing pixels;

Comparing the generated second fingerprint path information with the stored first fingerprint path information;

When the two do not match, the second target finger is identified as invalid; and

When the second finger spectrum information matches the stored first finger spectrum information and the generated second finger fingerprint information matches the stored first finger fingerprint information, the second target Fingers are recognized as valid.
The method according to claim 12, wherein, in the fingerprint entry step, the fingerprint path information of the first finger is simulated by the light collected by the sensing pixels and the light collected by the color pixels. produced jointly; and

In the fingerprint identification step, the second fingerprint path information is generated by fitting information of the light collected by the sensing pixels and the light collected by the color pixels.
An electronic device, comprising the optical fingerprint identification device according to any one of claims 1-6.
A readable storage medium, wherein a program or an instruction is stored on the readable storage medium, and when the program or instruction is executed by a processor, the optical fingerprint identification method according to any one of claims 7-13 is realized step.
A chip comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to realize the optical fingerprint according to any one of claims 7-13 Identify the steps of the method.
A computer program product, wherein the computer program product is stored in a non-volatile storage medium, and when the computer program product is executed by at least one processor, the method according to any one of claims 7-13 is realized. Steps of optical fingerprinting method.
An electronic device configured to execute the steps of the optical fingerprint identification method according to any one of claims 7-13.