Fingerprint detection module, electronic device and fingerprint detection method

Abstract

The application is suitable for the field of fingerprint identification technology, and provides a fingerprint detection module, an electronic device and a fingerprint detection method. The fingerprint detection module comprises a light sensor, the light sensor is used for receiving a reflected or scattered light signal, the reflected or scattered light signal is a light signal reflected or scattered by an object from detection light, and the detection light is derived from a light source of a display panel of the electronic device. In the embodiment of the application, the light source of the display panel of the electronic device is used as the detection light for fingerprint identification, the structural design space and cost are reduced, the difficulty of system composition is reduced, and integration is easy.

Description

[0001] This application claims priority to Chinese Patent Application No. 202010405116.9, filed on May 14, 2020, entitled "Fingerprint Module, Electronic Device and Fingerprint Detection Method", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of fingerprint recognition technology, and in particular relates to a fingerprint detection module, electronic device and fingerprint detection method. Background Technology

[0003] With the continuous development of fingerprint recognition technology and the widespread use of electronic devices, fingerprint recognition technology has been widely applied to electronic devices, which has improved the security of user identity verification during the use of electronic devices.

[0004] As fingerprint recognition technology becomes increasingly widely used in electronic devices, its security has become a major concern. However, while fingerprint information is unique, its static nature makes it relatively easy to obtain and even counterfeit. Therefore, improving and ensuring the security of fingerprint recognition is a significant challenge for the technology.

[0005] Meanwhile, under-display fingerprint recognition technology is developing rapidly in mobile phones and other terminal devices, attracting much attention due to its better ergonomics and superior user experience. Common under-display fingerprint recognition technologies include optical, capacitive, and ultrasonic types, among which optical under-display fingerprint recognition technology has received significant development due to its high resolution and accuracy.

[0006] Current main fingerprint optical anti-counterfeiting solutions generally require additional light sources, such as infrared LEDs, and require specialized lenses, filtering structures, and stacking constraints. This makes the system composition more complex and is not conducive to the integration and implementation of fingerprint recognition systems. Summary of the Invention

[0007] This application provides a fingerprint detection module, an electronic device, and a fingerprint detection method, which can at least solve the problem of the complex composition of under-display fingerprint recognition systems.

[0008] In a first aspect, embodiments of this application provide a fingerprint detection module, including a light sensor and a processor:

[0009] The optical sensor is used to receive reflected or scattered light signals, wherein the reflected or scattered light is light after the detection light is reflected or scattered by an object, and the detection light includes light emitted by the light source of the display panel of the electronic device;

[0010] The processor is used to perform fingerprint recognition based on the reflected or scattered light signal.

[0011] The embodiments provided in the first aspect of this application utilize the light source of the electronic device display panel as the detection light for fingerprint recognition, which reduces the structural design space and cost, lowers the difficulty of system composition, and is easy to integrate.

[0012] As one possible implementation of the first aspect, the fingerprint recognition based on the reflected or scattered light signal includes:

[0013] If the object is determined to be a human body based on the reflected or scattered light signal, then it is determined whether the object has a valid fingerprint based on the reflected or scattered light signal.

[0014] If it is determined that the object has a valid fingerprint, then the function corresponding to the valid fingerprint is executed.

[0015] The embodiments provided in the first aspect of this application collect reflected or scattered light signals through optical sensors to perform liveness detection and fingerprint recognition, avoiding the need to set up different devices to perform liveness detection and fingerprint recognition separately, reducing structural design space and cost, reducing the difficulty of system composition, and making it easy to integrate.

[0016] As one possible implementation of the first aspect, the fingerprint recognition based on the reflected or scattered light signal includes:

[0017] If the object is determined not to be a human body based on the reflected or scattered light signal, a fingerprint recognition result indicating unsuccessful fingerprint verification is output.

[0018] As one possible implementation of the first aspect, the processor is further configured to: control a preset area of ​​the backlight to emit the detection light in response to a fingerprint detection event.

[0019] As one possible implementation of the first aspect, the processor is further configured to: control a preset area of ​​the display panel to emit the detection light in response to a fingerprint detection event.

[0020] As one possible implementation of the first aspect, the processor is further configured to: display a fingerprint pattern in a preset area of ​​the display panel in response to a fingerprint detection event.

[0021] The embodiments provided in the first aspect of this application, by displaying a fingerprint pattern in a preset area of ​​the display panel, can intuitively prompt the user to input their fingerprint at the corresponding position of the displayed fingerprint pattern to achieve fingerprint detection. This can improve interaction efficiency, improve the integrity of fingerprint collection, and thus improve detection accuracy.

[0022] Secondly, embodiments of this application provide a fingerprint detection module, including an optical sensor.

[0023] The optical sensor is used to receive reflected or scattered light signals, which are light signals after the detection light is reflected or scattered by an object, and the detection light originates from the light source of the display panel of the electronic device.

[0024] Thirdly, embodiments of this application provide an electronic device, including a display panel and a fingerprint detection module as described in the first or second aspect; the display panel includes a light source, the light source of the panel being used to provide the detection light source for the detection module.

[0025] Fourthly, embodiments of this application provide a fingerprint detection method applied to electronic devices, comprising:

[0026] Receive reflected or scattered light signals, wherein the reflected or scattered light is light after the detection light is reflected or scattered by an object, and the detection light includes light emitted by the backlight of the display panel of the electronic device;

[0027] Fingerprint identification is performed based on the emitted or scattered light signals.

[0028] Fifthly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the electronic device performs the method as described in the fourth aspect.

[0029] In a sixth aspect, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the fourth aspect.

[0030] In a seventh aspect, embodiments of this application provide a computer program product that, when run on an electronic device, causes the electronic device to perform the method described in the fourth aspect above.

[0031] It is understood that the beneficial effects of the second to seventh aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a mobile phone to which the fingerprint detection method provided in one embodiment of this application is applicable;

[0034] Figure 2A This is an example diagram of a mobile phone including a fingerprint module from one angle, provided in an embodiment of this application;

[0035] Figure 2B Another example view of a mobile phone including a fingerprint module provided in an embodiment of this application;

[0036] Figure 3A This is a schematic diagram of the structure of a fingerprint module provided in one embodiment of this application;

[0037] Figure 3B This is a diagram showing the visible light reflection characteristics of different fingers according to an embodiment of this application;

[0038] Figure 4 This is a schematic diagram of the structure of a fingerprint module provided in another embodiment of this application;

[0039] Figure 5 This is a schematic diagram of the structure of a fingerprint module provided in another embodiment of this application;

[0040] Figure 6 This is a schematic diagram of the structure of a fingerprint module provided in another embodiment of this application;

[0041] Figure 7 This is a schematic diagram of the structure of a fingerprint module provided in another embodiment of this application;

[0042] Figure 8A This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to an embodiment of this application;

[0043] Figure 8B This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to another embodiment of this application;

[0044] Figure 8C This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to another embodiment of this application.

[0045] Figure 9 This is a flowchart of a fingerprint detection method provided in an embodiment of this application;

[0046] Figure 10 This is a schematic diagram illustrating an application scenario of the fingerprint detection method provided in one embodiment of this application;

[0047] Figure 11A This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to an embodiment of this application;

[0048] Figure 11B This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to an embodiment of this application;

[0049] Figure 11C This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to an embodiment of this application;

[0050] Figure 11D This is a schematic diagram showing the distribution of the response area of ​​an under-display fingerprint module according to an embodiment of this application;

[0051] Figure 12 This is a schematic diagram of the structure of a fingerprint detection device provided in an embodiment of this application;

[0052] Figure 13 This is a schematic diagram of the structure of a fingerprint detection device provided in another embodiment of this application;

[0053] Figure 14 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0054] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0055] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0056] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0057] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0058] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0059] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0060] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, it may be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it may be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate orientations or positions based on the orientations or positions shown in the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0061] Although fingerprint information is a unique biometric feature, its static nature makes it relatively easy to obtain and even counterfeit. Therefore, in electronic devices using fingerprint authentication, malicious user authorization can easily be obtained, leading to information leaks and financial losses. Furthermore, optical fingerprint recognition technology has been heavily developed due to its high resolution and accuracy. Most optical anti-counterfeiting solutions generally require additional light sources, increasing the structural complexity of the anti-counterfeiting system and affecting its integration. Therefore, this application provides a fingerprint module, electronic device, and fingerprint detection method that significantly improves the integration of fingerprint anti-counterfeiting systems. Specifically, it directly utilizes the screen light source of the electronic device, avoiding the additional requirements of infrared light sources in existing solutions.

[0062] The electronic devices referred to in this application include, but are not limited to, mobile phones, tablets, wearable devices, in-vehicle devices, augmented reality (AR) / virtual reality (VR) devices, laptops, ultra-mobile personal computers (UMPCs), netbooks, or personal digital assistants (PDAs), etc. This application does not limit the specific type of electronic device. For ease of description, the electronic devices described in this application are illustrated using a mobile phone as an example; however, this should not be construed as a specific limitation of this application.

[0063] Taking a mobile phone as an example, the electronic device in question is described. Figure 1 The diagram shown is a block diagram of a portion of the structure of a mobile phone according to an embodiment of this application. (Reference) Figure 1 The mobile phone 100 includes components such as a memory 110, a processor 120, an input unit 130, a display unit 140, and a sensor 150. Those skilled in the art will understand that... Figure 1 The mobile phone structure shown does not constitute a limitation on the mobile phone and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0064] The following is combined with Figure 1 A detailed introduction to each component of a mobile phone:

[0065] The memory 110 can be used to store software programs and modules. The processor 120 executes various functions and data processing of the mobile phone by running the software programs and modules stored in the memory 110. The memory 110 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as fingerprint recognition), etc.; the data storage area may store data created based on the use of the mobile phone (such as fingerprint data), etc. In addition, the memory 110 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0066] The input unit 130 can be used to receive input numerical or character information, and to generate key signal inputs related to user settings and function control of the mobile phone 100. Specifically, the input unit 130 may include a touch panel 131 and other input devices 132. The touch panel 131, also known as a touch screen, can collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch panel 131), and drive the corresponding connection devices according to a pre-set program. Optionally, the touch panel 131 may include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch position and the signal generated by the touch operation, and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, sends it to the processor 120, and can receive and execute commands sent by the processor 120. In addition, the touch panel 131 can be implemented using various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 131, the input unit 130 may also include other input devices 132. Specifically, other input devices 132 may include, but are not limited to, one or more of the following: physical keyboard, function keys (such as volume control buttons, power buttons, etc.), trackball, mouse, joystick, etc.

[0067] The display unit 140 can be used to display information input by the user or information provided to the user, as well as various menus of the mobile phone. The display unit 140 may include a display panel 141, which may optionally be configured as a liquid crystal display (LCD), organic light-emitting diode (OLED), or similar display. Furthermore, a touch panel 131 may cover the display panel 141. When the touch panel 131 detects a touch operation on or near it, it transmits the information to the processor 120 to determine the type of touch event. Subsequently, the processor 120 provides corresponding output on the display panel 141 based on the type of touch event. Although in Figure 1 In this context, the touch panel 131 and the display panel 141 are two separate components for realizing the input and output functions of the mobile phone. However, in some embodiments, the touch panel 131 and the display panel 141 can be integrated to realize the input and output functions of the mobile phone, such as a touch display screen.

[0068] In some embodiments, the display unit 140 may include one or N displays, where N is a positive integer greater than 1.

[0069] In some embodiments, when the display panel is made of a flexible material, the display panel can be bent. Here, "the display panel can be bent" means that the display panel can be bent to any angle at any location along any axis and can be held at that angle.

[0070] In some embodiments, the display unit 140 may include a main display panel and a secondary display panel, which are parallel and operate independently of each other. The main display panel is disposed on one side of the mobile phone, and the secondary display panel is disposed on the other side of the mobile phone.

[0071] The mobile phone 100 may also include at least one sensor 150, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel 141 according to the ambient light level, and the proximity sensor can turn off the display panel 141 and / or backlight when the phone is moved to the ear. As a type of motion sensor, an accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity and can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition-related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the phone, such as gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.

[0072] Although not shown, the mobile phone 100 may also include radio frequency (RF) circuitry, audio circuitry, wireless fidelity (WiFi) module, camera, Bluetooth module, and power supply, etc., which will not be described in detail here.

[0073] Taking a mobile phone as another example, the electronic device in question is... Figure 2A and Figure 2B The diagram shown is a partial structural illustration of a mobile phone according to an embodiment of this application. Figure 2A As shown, the mobile phone 200 includes: a display panel 210 and an under-display fingerprint module 220, wherein the under-display fingerprint module 220 is disposed relative to a preset area 2101 of the display panel 210. Figure 2B As shown, the under-display fingerprint module 220 can be specifically disposed below the preset area 2101 of the display panel 210, or disposed inside the body of the mobile phone 200.

[0074] The fingerprint module provided in this application includes a display panel 210 and an under-display fingerprint module 220.

[0075] Those skilled in the art will understand that Figure 2A and Figure 2BThe mobile phone structure shown does not constitute a limitation on the mobile phone and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0076] Figure 3A The diagram shown is a structural schematic of a fingerprint module according to an embodiment of this application. For easier understanding of this embodiment, Figure 3 shows the display panel 310 of the mobile phone and the under-display fingerprint module 320, which includes a light sensor 3202. The rest of the mobile phone is not shown.

[0077] like Figure 3A As shown, the fingerprint module 320 may include a light source 3201 and a light sensor 3202. The light source 3201 utilizes the light source of the display panel 310; that is, the fingerprint module uses the light source of the display panel 310 as its detection light source. As mentioned earlier, the display panel can be configured using an LCD or OLED. In some embodiments, the display panel uses an LCD, requiring a backlight as its light source. In other embodiments, the display panel uses an OLED, where each pixel can emit its own light, and the OLED's light source is a self-emissive light source. In other words, in the embodiments of this application, the light source of the display panel may include a backlight or a self-emissive light source.

[0078] The display panel 310 emits visible light of at least one or more preset wavelengths. The visible light is reflected or scattered by an object (such as a user's finger) on the display panel 310 and then shines on the light sensor 3202. The light sensor 3202 receives the reflected or scattered light of the preset wavelength and obtains the reflected or scattered light signal of the preset wavelength.

[0079] It should be noted that one or more preset wavelengths of visible light are received by a light sensor after being reflected or scattered by an object. The light sensor can acquire the energy difference between the peaks and troughs of the fingerprint's reflection or scattering, and this energy difference can be used for fingerprint recognition. The light sensor can also acquire reflected or scattered light signals for liveness detection. "Liveness detection" refers to detecting whether the fingerprint is from a real human or a prosthetic fingerprint (such as a rubber prosthesis). Liveness detection is based on the difference in the intensity of reflection or scattering of light of a certain wavelength between real and prosthetic fingerprints. Liveness detection can be achieved using one or more wavelengths of light. Using multiple wavelengths of light for detection can improve detection accuracy.

[0080] Optionally, in the examples of this application, the sensing area of ​​the light sensor is composed of an array of pixel photosensitive units, with a size of, for example, 150*150, and the size of each pixel is, for example, 50μm. It should be understood that the pixel size depends on the specific performance scheme, and this application does not limit it.

[0081] Reference Figure 3BAs shown, the example of using the reflectance spectrum characteristics of visible light for liveness detection will be used for illustration. Figure 3B The study demonstrates the reflectance spectral characteristics of different human fingers in the visible light band, including test results for the thumbs and index fingers of young, middle-aged, and elderly individuals. The results show that the reflectance (%) of human fingers varies across different wavelengths (in nm), exhibiting specific "absorption and reflection characteristic peaks," such as band A (approximately 430 nm), band B (approximately 520 nm), band C (approximately 570 nm), and band D (above 650 nm). The positions of these "absorption and reflection characteristic peaks" are relatively stable across different fingers, and the proportional relationship between these peaks is also relatively stable. This indicates that the reflectance spectra of different real human fingers also possess some relatively stable or minimally changing characteristics. For example, the positions of the peaks and troughs are relatively stable or essentially unchanged, and the relative magnitudes of the reflectance characteristics (the ratio of reflectance) between the peaks and troughs are also relatively stable or essentially unchanged. In other words, if the spectral characteristics of the reflected light signal received by the light sensor possess these relatively stable or essentially unchanged characteristics, it indicates that the object on the display panel is a real human finger. The embodiments of this application distinguish between real human fingers and prosthetics by judging whether the spectral characteristics of the reflected or scattered light signals received by the optical sensor have these relatively stable characteristics.

[0082] In this embodiment, imaging signals from different wavelengths of detection light are collected, and the positions of "specific wavelengths," including those with preset wavelengths, and the relative reflectance characteristics between them are compared to determine whether they are within the normal range. In other words, the imaging is judged to possess one or more relatively stable characteristics to distinguish between a real human finger and a prosthesis. For example, by determining whether characteristic peaks exist in four wavelength bands—A, B, C, and D—and the relative reflectance characteristics R... A / R D Whether the value is less than a threshold (e.g., 0.5), etc., is used to verify the authenticity of a finger above the display panel. Among these, the relative reflectance characteristic R... A / R DThis represents the ratio of reflectance in band A to reflectance in band D. Based on the differences in spectral properties between different materials, it can effectively distinguish common fake fingers, such as silicone fingerprint molds, printed fingers, or embossed fingers, from real human fingers, greatly improving the biometric anti-counterfeiting capabilities of under-display fingerprint recognition systems. For example, by acquiring specific band fingerprint imaging signals Rb and Rd in bands B and D, and based on certain threshold relationships, it can be used to determine whether the reflected signal is due to biological reflection. For example, thresholds that can be determined include the relative intensity of Rb / Rd between adjacent imaging units (Rb / Rd < 0.6), and / or whether the signal intensity of Rb in the overall image is between 10-30%, and / or whether the signal intensity of Rd is above 40%, etc. The various values ​​listed here are for illustrative purposes only, and the embodiments of the present invention are not limited to these values.

[0083] It should be understood that liveness detection can be performed using scattering spectral characteristics, and the principle is similar to that of liveness detection using reflectance spectral characteristics, which will not be elaborated here.

[0084] To enable the light sensor to respond to a portion of preset wavelengths, as an example of this application, the light sensor includes an array of pixel photosensitive units. The response band of the light sensor (or pixel photosensitive units) may include at least one or more selected preset wavelengths, and more generally, may include at least the entire wavelength range of the display panel. The response band of a pixel photosensitive unit represents the spectral range that the pixel photosensitive unit can detect.

[0085] Typically, display panels use white light as their light source, emitting light in the visible light band. The response band of a light sensor can be selected from the entire visible light band, such as 400 to 760 nm, 400 to 800 nm, or 390 to 780 nm. Alternatively, the response band can include at least a visible light band, such as below 760 nm, or at least a preset wavelength. When the display panel emits light in both the visible and infrared bands, the response band of the light sensor can be selected from the entire visible and infrared bands, or from bands below infrared. In other words, the display panel's emission band can be used to determine the light sensor's response band, ensuring that the light sensor responds to at least a preset wavelength. For example, the intersection of the light sensor's response band and the display panel's emission band may include the preset wavelength.

[0086] Meanwhile, the fingerprint module may also include a filter. The filter is positioned between the light sensor and the display panel, and includes one or more filter structures. The number and types of filter structures may be the same as or different from the number of preset wavelengths; each filter structure allows light of one or more preset wavelengths to pass through.

[0087] As a non-restrictive example, such as Figure 4As shown, the light source of the display panel 410 is in the visible light band. The detection light emitted by the display panel 410 includes the visible light band. Obviously, the detection light includes at least two different preset wavelengths, such as red light at 650nm and green light at 520nm. The light sensor includes identical pixel photosensitive units 4201 arranged in an array. The response band of the pixel photosensitive unit 4201 is selected from the entire visible light band, such as 400 to 760nm. The area above two adjacent pixel photosensitive units is matched with two filter structures of different wavelengths, namely the first filter structure 4311 and the second filter structure 4312. The first filter structure 4311 allows red light at 650nm to pass through, and the second filter structure 4312 allows green light at 520nm to pass through. In this example, fingerprint recognition and liveness detection can be performed based on two wavelengths of light.

[0088] As another non-limiting example, the detection light emitted by the display panel includes multiple different preset wavelengths, such as N different preset wavelengths, where N is a positive integer; the light sensor includes an array of identical pixel photosensitive units, and the response band is selected across the entire visible light spectrum, such as 400 to 760 nm; a filter is disposed between the light sensor and the display panel, and the filter includes multiple filter structures matching different wavelengths, such as M filter structures, where M is a positive integer less than or equal to N; each filter structure allows one or more preset wavelengths to pass through, so the light sensor can receive reflected or scattered light of at least M preset wavelengths. One or more wavelengths of reflected or scattered light from the M preset wavelengths can be selected for fingerprint recognition and liveness detection; or one or more wavelengths of reflected or scattered light from the M preset wavelengths can be selected for liveness detection, while fingerprint recognition is performed using the reflected or scattered light of the M preset wavelengths. In this example, the filter includes M filter structures matching different wavelengths, and the light sensor includes an array of pixel photosensitive units, each of which can receive reflected or scattered light of one of the at least M preset wavelengths. With the filter and photosensitive sensor structures and parameters fixed, the wavelength of reflected or scattered light received by each pixel photosensitive unit is predetermined. Therefore, the processor can acquire the reflected or scattered light from a specific pixel photosensitive unit, thereby obtaining reflected or scattered light of a specific wavelength. This allows for the selection of one or more specific wavelengths of reflected or scattered light from M preset wavelengths, and then fingerprint recognition and / or liveness detection based on the selected specific wavelengths. It should be noted that to generate a high-quality fingerprint image for fingerprint recognition, the processor needs to utilize imaging signals from reflected or scattered light received by pixel photosensitive units at different locations. In other words, a fingerprint image cannot be generated using only the imaging signal from a single pixel photosensitive unit. Therefore, the embodiments of this application can adjust the specific wavelength used for fingerprint detection and / or the number of specific wavelengths used for fingerprint detection as needed, greatly improving the flexibility and applicability of optical under-display fingerprint detection. It should be understood that the specific number and specific wavelengths used for liveness detection and fingerprint recognition are not specifically limited in the embodiments of this application. They can be determined according to the specific detection accuracy requirements and specific performance schemes, and are not limited in this application.

[0089] As another non-limiting example, the detection light emitted by the display panel includes the visible light band. Obviously, the detection light includes at least one preset wavelength, such as 650nm red light. The light sensor includes multiple pixel photosensitive units arranged in an array. The response wavelength of each pixel photosensitive unit includes the entire wavelength range of the display panel's light source. A filter corresponding to the wavelength is matched to the area above the pixel photosensitive unit, and the filter allows 650nm red light to pass through. In this example, fingerprint recognition and liveness detection can be based on a single wavelength, i.e., based on a specific wavelength (650nm red light).

[0090] As another non-limiting example, the detection light emitted by the display panel includes at least one preset wavelength, and the light sensor includes multiple pixel photosensitive units arranged in an array. The response band of each pixel photosensitive unit corresponds to one of the preset wavelengths; for example, the absorption peak of the response band is at the preset wavelength. In this case, a filter that allows the preset wavelength to pass through can be provided above the light sensor, or no filter can be provided.

[0091] The filter can be implemented using the RGB filter film commonly found in LCDs, or by depositing corresponding filter layers at different pixel locations using vapor phase evaporation. The specific implementation method of the filter depends on the specific performance requirements, and this application does not limit it.

[0092] To enable the light sensor to respond to a portion of preset wavelengths, as another example of this application, the light sensor includes an array of pixel photosensitive units that are not entirely identical; that is, the light sensor includes multiple types of pixel photosensitive units. The number of different types of pixel photosensitive units may be the same as or different from the number of preset wavelengths. Different types of pixel photosensitive units are matched with different response bands, that is, they are matched with different preset wavelengths. In this application, pixel photosensitive units of the same type refer to pixel photosensitive units with completely identical response bands. If the response bands are completely different or only partially the same, they are different types of pixel photosensitive units.

[0093] As a non-limiting example, a light sensor may include two or more finite types of pixel photosensitive units. Taking two types as an example, such as... Figure 5 As shown, the detection light emitted by the display panel 510 includes the visible light band. Clearly, the detection light includes at least two different preset wavelengths, such as red light at 650nm and green light at 520nm. The pixel photosensitive unit includes two types of pixel photosensitive units: a first pixel photosensitive unit 5201 and a second pixel photosensitive unit 5202. The first pixel photosensitive unit 5201 and the second pixel photosensitive unit 5202 are spaced apart, and the first pixel photosensitive unit 5201 and the second pixel photosensitive unit 5202 are matched with different response wavelengths. For example, the absorption peak of the first pixel photosensitive unit 5201 is at red light at 650nm, while the absorption peak of the second pixel photosensitive unit 5202 is at green light at 520nm. In this case, the fingerprint module can omit the filter.

[0094] As another non-limiting example, the detection light emitted by the display panel includes multiple different preset wavelengths, such as S different preset wavelengths, where S is a positive integer; the light sensor includes multiple pixel photosensitive units arranged in an array, such as T types of pixel photosensitive units, where T is a positive integer less than or equal to S; each pixel photosensitive unit responds to a preset wavelength, and the light sensor can receive reflected or scattered light of T preset wavelengths. In this example, the light sensor includes T types of pixel photosensitive units arranged in an array, and the light sensor can receive reflected or scattered light of T preset wavelengths. With the light sensor structure and parameters determined, the wavelength of the reflected or scattered light received by the pixel photosensitive unit at each location is determined. Therefore, the processor can acquire the reflected or scattered light from the pixel photosensitive unit at a specific location, thereby acquiring the reflected or scattered light of a specific wavelength, thus enabling the selection of one or more specific wavelengths of reflected or scattered light from the T preset wavelengths, and then performing fingerprint recognition and / or liveness detection based on the selected specific wavelengths of reflected or scattered light. It should be noted that, in order to generate a high-quality fingerprint image for fingerprint recognition, the processor needs to utilize imaging signals of reflected or scattered light received from pixel photosensitive units at different locations during the fingerprint image generation process. In other words, a fingerprint image cannot be generated using only the imaging signal of reflected or scattered light received from a single pixel photosensitive unit. Therefore, in this embodiment, one or more specific wavelengths of reflected or scattered light can be selected from T preset wavelengths for fingerprint recognition and liveness detection; alternatively, one or more specific wavelengths of reflected or scattered light can be selected from T preset wavelengths for liveness detection, while fingerprint recognition is performed using the reflected or scattered light from the T preset wavelengths. For example, imaging signals generated by pixel sensing units responding to preset wavelengths used for liveness detection can be acquired, and liveness detection can be performed by analyzing the magnitude and / or relative magnitude of the preset wavelengths in the imaging signals; imaging signals generated by pixel sensing units responding to preset wavelengths used for fingerprint recognition can be acquired, and fingerprint recognition can be achieved by analyzing the imaging signals to determine whether the current fingerprint image is a preset fingerprint. This embodiment allows for adjustment of at least one of the wavelengths and quantities used for fingerprint detection (including liveness detection and fingerprint recognition) as needed, greatly improving the flexibility and applicability of optical under-display fingerprint detection. It should be understood that the number and wavelength of preset wavelengths used for liveness detection and fingerprint recognition are not specifically limited in the embodiments of this application. They can be determined according to the specific detection accuracy requirements and specific performance schemes, and are not limited in this application.

[0095] The requirement for pixel photosensitive units to respond to different wavelengths can be achieved by using different semiconductor doping methods to make the response wavelengths of silicon-based or glass-based photosensitive units different, or by using different photosensitive materials. This application does not limit this, depending on the specific performance scheme.

[0096] It should be noted that in some embodiments of this application, when the light sensor uses pixel photosensitive units that are not exactly the same, in order to further optimize the performance of the light sensor, the fingerprint module may also include a filter, which is disposed between the light sensor and the display panel.

[0097] In this case, as an example of this application, the filter may include a filter structure. The wavelengths allowed to pass through the filter structure are at least partially the same as the response wavelengths of the corresponding pixel photosensitive units. For example, the wavelengths allowed to pass through the filter structure include all or part of the response wavelengths of the corresponding pixel photosensitive units. Furthermore, the number of types of filter structures may be the same as or different from the number of preset wavelengths, and each filter structure may allow light of one or more preset wavelengths to pass through.

[0098] For example, the filter includes two or more finitely different filter structures. Taking two as an example, such as... Figure 6 As shown, the detection light emitted by the display panel 610 includes the visible light band. Clearly, the detection light includes at least two different preset wavelengths, such as red light at 650nm and green light at 520nm. The pixel photosensitive unit includes two types of pixel photosensitive units: a third pixel photosensitive unit 6201 and a fourth pixel photosensitive unit 6202. The third pixel photosensitive unit 6201 and the fourth pixel photosensitive unit 6202 are spaced apart and matched with different response wavelengths. For example, the absorption peak of the third pixel photosensitive unit 6201 is at red light at 650nm, while the absorption peak of the fourth pixel photosensitive unit 6202 is at green light at 520nm. The filter includes two filter structures: a third filter structure 6301 and a fourth filter structure 6302. The third filter structure 6301 corresponds to the third pixel photosensitive unit 6201, and the fourth filter structure corresponds to the fourth pixel photosensitive unit 6202. The third filter structure 6301 allows red light to pass through at 650nm, and the fourth filter structure 6302 allows green light to pass through at 520nm. It can be understood that the terms "third pixel photosensitive unit" and "fourth pixel photosensitive unit" here are intended to distinguish them from the "first pixel photosensitive unit" and "second pixel photosensitive unit" in the above example, and do not specifically indicate that there are four different pixel photosensitive units in this example. It can also be understood that the terms "third filter structure" and "fourth filter structure" here are intended to distinguish them from the "first filter structure" and "second filter structure" in the above example, and do not specifically indicate that there are four different filter structures in this example.

[0099] As another example of this application, when the light source of the display panel is visible light, the filter may include a bandpass filter structure that allows visible light to pass through, such as an infrared filter film. The bandpass wavelength of the infrared filter film is 400 to 700 nm. The filter may also include a low-pass filter structure that at least allows visible light to pass through, such as a low-pass filter structure that allows wavelengths below 760 nm to pass through. The filter may also include a filter structure that at least allows a preset wavelength to pass through. When the light source of the display panel includes more than just visible light, for example, when the light source includes both visible light and infrared light, the filter may include a first filter structure and a second filter structure, wherein the first filter structure allows the entire wavelength range of the light source to pass through, and the second filter structure allows wavelengths used for fingerprint detection to pass through.

[0100] For example, the light sensor includes two or more different pixel photosensitive units; taking two as an example, such as... Figure 7 As shown, the detection light emitted by the display panel 710 includes visible light, and obviously includes at least two different preset wavelengths: red light at 650nm and green light at 520nm. The filter structure 730 uses an infrared filter film with a bandpass of 400 to 700nm. The pixel photosensitive unit includes two types of pixel photosensitive units, namely the fifth pixel photosensitive unit 7201 and the sixth pixel photosensitive unit 7202. The fifth pixel photosensitive unit 7201 and the sixth pixel photosensitive unit 7202 are arranged alternately to match different response wavelengths. For example, the absorption peak of the fifth pixel photosensitive unit 7201 is in the red light band at 650nm, while the absorption peak of the sixth pixel photosensitive unit 7202 is in the green light band at 520nm. It can be understood that the "fifth pixel photosensitive unit" and "sixth pixel photosensitive unit" here are intended to distinguish them from the "first pixel photosensitive unit" to "fourth pixel photosensitive unit" in the above example, and do not specifically refer to the existence of six different pixel photosensitive units in this example. In this example, by setting a filter structure that allows visible light to pass through, the influence of light other than visible light (such as light other than visible light in ambient light) on the detection results is reduced, thereby improving the accuracy of the results.

[0101] It should be understood that in the embodiments of this application, the distribution of the filter structure that allows light of different wavelengths (or bands) to pass through, and the pixel photosensitive units that respond to different wavelengths (or bands), can be flexibly arranged according to requirements. A connected filter structure that allows light of the same wavelength (or band) to pass through constitutes a response region; a connected pixel photosensitive unit that responds to light of the same wavelength (or band) also constitutes a response region. The distribution of the response regions can be a checkerboard arrangement or a striped arrangement. The total number of response regions for each filter and pixel photosensitive unit can be the same as the number of preset fingerprint detection wavelengths. Furthermore, the areas of the response regions for different preset wavelengths (or bands) can be the same or different. This application does not limit the distribution or area of ​​the response regions.

[0102] For example, the illustration will be given by taking two types of pixel photosensitive units that respond to two different preset wavelengths, such as wavelength B and wavelength D, where wavelength B is approximately 520 nm and wavelength D is approximately 650 nm. Figure 8A As shown, the central region is the response region composed of pixel photosensitive units that respond to wavelength B, and the peripheral region is the response region composed of pixel photosensitive units that respond to wavelength D. Figure 8B As shown, the response regions for wavelength B and wavelength D are arranged alternately in a certain ratio (e.g., 1:1). This distribution of response regions allows for the simultaneous acquisition of fingerprint images for both wavelengths B and D. Figure 8C As shown, in Figure 8B Based on the above, the uniformity of the pixel photosensitive unit spacing is further improved. This distribution method can further improve the resolution and uniformity of the image.

[0103] Another example is that the arrangement of the filter structure can correspond to the arrangement of the pixel photosensitive units, for example, it can be one of the 8A to 8C arrangements. Taking the example of two filter structures each allowing two different preset wavelengths to pass through, such as wavelength B and wavelength D, where wavelength B is approximately 520 nm and wavelength D is approximately 650 nm. See also... Figure 8A As shown, the central region is the response region formed by a filter structure that allows wavelength B to pass through, and the peripheral region is the response region formed by a filter structure that allows wavelength D to pass through. See also... Figure 8B As shown, the response regions allowing wavelength B to pass through and those allowing wavelength D to pass through are arranged alternately in a certain ratio (e.g., 1:1). This distribution of response regions allows for the simultaneous acquisition of fingerprint images for both wavelengths B and D. See also... Figure 8C As shown, in Figure 8B Based on the above, the uniformity of the pixel photosensitive unit spacing is further improved. This distribution method can further improve the resolution and uniformity of the image.

[0104] It should be understood that when an under-display fingerprint module includes pixel photosensitive units but not a filter structure, the response area distribution of the under-display fingerprint module is the response area distribution formed by the pixel photosensitive units. When an under-display fingerprint module includes both pixel photosensitive units and a filter structure, the response area distribution of the under-display fingerprint module is the superposition of the response area distribution formed by the pixel photosensitive units and the response area distribution formed by the filter structure. Specifically, the intersection of the response area formed by the pixel photosensitive units and the response area formed by the filter structure constitutes the response area of ​​the under-display fingerprint module. For example, when the response wavelength of a pixel photosensitive unit in a certain region is wavelength B, and the filter structure corresponding to that region allows the transmission of wavelengths including wavelength B, then the response wavelength of the under-display fingerprint module for that region is wavelength B.

[0105] It should be noted that, in some embodiments of this application, an optically transparent structure may be provided between the display panel and the light sensor, or between the display panel and the filter, or between the filter and the light sensor. The optically transparent structure can be an air layer or an optically transparent adhesive, serving as a transition layer between the various components. When using optically transparent adhesive, it is possible to fix the components together; for example, an under-display fingerprint module can be fixedly mounted on the display panel, making system assembly and integration easier.

[0106] In the above embodiments of this application, the under-display fingerprint module is configured to respond to light of at least one fingerprint detection wavelength emitted by the display panel. On the one hand, it directly utilizes the light source of the electronic device's display panel, eliminating the need for an additional light source, thus reducing structural design space and cost, simplifying system composition, and facilitating integration. On the other hand, by collecting reflected or scattered light of at least one fingerprint detection wavelength through a light sensor, liveness detection and fingerprint recognition are achieved, avoiding the need for separate devices for liveness detection and fingerprint recognition, further reducing structural design space and cost, simplifying system composition, and facilitating integration. Furthermore, by simultaneously collecting reflected or scattered light of at least two different wavelengths through a light sensor, the sequential acquisition of signals across different wavelengths is avoided, improving the efficiency of fingerprint recognition.

[0107] It should be understood that the phrase "the filter structure allows light of a certain wavelength to pass through" or other similar expressions in this application mean that the filter structure only allows light of that wavelength to pass through or allows a certain band of light including that wavelength to pass through. Similarly, the phrase "the optical sensor responds to or matches a certain wavelength" or other similar expressions mean that the optical sensor only detects light of that wavelength or detects a certain band of light including that wavelength.

[0108] like Figure 9 As shown in the figure, this application embodiment also provides a fingerprint detection method, which can be applied to electronic devices. The fingerprint detection method includes steps S910 to S930. The specific implementation principle of each step is as follows.

[0109] S910, in response to a fingerprint detection event, controls a preset area of ​​the display panel to emit detection light including at least one preset wavelength, the detection light being reflected or scattered after illuminating an object covering the preset area.

[0110] In this embodiment, the fingerprint detection event is an event based on liveness detection and fingerprint recognition to verify whether the current user is a pre-set user of the electronic device. The fingerprint detection event can be triggered by the user performing a preset operation, or it can be actively triggered by the electronic device in response to detecting a triggering condition.

[0111] In some embodiments of this application, a fingerprint detection event may be an event that triggers an electronic device to display a fingerprint pattern.

[0112] As an example, in response to a fingerprint detection event, a fingerprint pattern is displayed in a preset area of ​​the display panel. Figure 10 As shown, fingerprint pattern 101. When the electronic device detects an object covering the preset area, it controls the preset area of ​​the display panel to emit detection light.

[0113] As another example, in response to a fingerprint detection event, a fingerprint pattern is displayed in a preset area of ​​the display panel, see further examples such as... Figure 10 As shown, fingerprint pattern 101. The system controls the preset area of ​​the display panel to emit detection light. If an object covers the preset area, the detection light is directed towards the object.

[0114] The detection light is used to generate reflected or scattered light after being shone on an object. The detection light can be, but is not limited to, visible light, or visible light and infrared light. In some embodiments of this application, the wavelength of the detection light can be the emission wavelength of the display panel light source. In other embodiments of this application, the wavelength or wavelength of the detection light can be selected from the emission wavelength of the display panel light source; it can be one wavelength, multiple wavelengths, or one wavelength band within the emission wavelength of the light source, as long as the detection light includes at least one preset wavelength for fingerprint detection. Specifically, the processor of the electronic device can control the driving circuit of the display panel light source, thereby controlling the light source of the display panel to provide detection light of a specific wavelength or wavelength band. It should be understood that this application does not specifically limit the wavelength or wavelength band of the detection light. Preferably, the preset wavelength for fingerprint detection includes at least one of the following four wavelengths: wavelength A (approximately 430 nm), wavelength B (approximately 520 nm), wavelength C (approximately 570 nm), and wavelength D (approximately 650 nm).

[0115] Controlling a preset area of ​​the display panel of an electronic device to emit detection light includes cases where only the preset area emits detection light, and cases where at least the preset area emits detection light. The preset area emitting detection light may include detection light emitted by a portion of the light sources on the display panel, wherein the portion of the light sources is the light source corresponding to the preset area among the light sources of the display panel. In some embodiments of this application, the preset area of ​​the display panel is an area for a user to press their fingerprint to complete fingerprint detection. In some embodiments of this application, the preset area is an area on the display panel that displays a fingerprint pattern.

[0116] In some embodiments of this application, the luminous intensity range of the detection light includes the adjustable range of the backlight intensity of the display panel. To obtain a better detection effect, the luminous intensity of the detection light can be set to the maximum backlight intensity. In other embodiments of this application, the maximum luminous intensity of the light source in a preset area of ​​the display panel can be set to have a higher maximum luminous intensity than other areas, thereby providing detection light that is more conducive to fingerprint detection (including liveness detection and fingerprint recognition) during the fingerprint detection process.

[0117] To prevent accidental touches by users, in some embodiments of this application, the electronic device may be configured to emit detection light when the pressure applied to the object exceeds a preset threshold or the pressing duration reaches a preset duration.

[0118] It should be noted that, in some embodiments of this application, the electronic device can monitor touch operations, and the electronic device also needs to include a touch panel, which can cover the display panel, and the touch panel can also be integrated with the display panel.

[0119] In one exemplary scenario of this application, when a user needs to unlock the screen of an electronic device in a locked state (including a black screen or a bright screen), if the electronic device detects a fingerprint detection event, such as... Figure 10 As shown, a fingerprint pattern 101 is displayed in a preset area of ​​the electronic device's screen, prompting the user to authenticate their identity via fingerprint detection. When the user presses their finger on the displayed fingerprint pattern 101, the electronic device responds to the press operation by controlling the preset area of ​​the screen to emit detection light for fingerprint detection. For example, in the locked screen black state, the fingerprint pattern is displayed once at preset intervals within a certain period after the screen goes black, while other display areas can be set to black. In this case, each preset interval constitutes a fingerprint detection event in the locked screen black state. Alternatively, in the locked screen black state, if a user touch operation is detected, the fingerprint pattern is displayed in the preset area of ​​the screen, while other display areas can be set to black, or the screen can go completely black after displaying the fingerprint pattern for a preset period. In this case, in the locked screen black state, the detected user touch operation constitutes a fingerprint detection event. Furthermore, in the locked screen black state, if a screen-on event is detected, the electronic device lights up the screen in the locked state and displays the fingerprint pattern in the preset area of ​​the screen. At this time, in the locked screen state, the screen-on event detected is a fingerprint detection event.

[0120] In another exemplary scenario of this application, if a user needs to initiate payment through an electronic device, or if a user needs to log in to a terminal application on an electronic device, the electronic device listens for a fingerprint detection event, such as... Figure 10 As shown, a fingerprint pattern 101 is displayed in a preset area of ​​the electronic device's screen, prompting the user to authenticate their identity using their fingerprint. When the user presses their finger on the displayed fingerprint pattern 101, the electronic device responds to the press operation by controlling the preset area of ​​the screen to emit detection light. A fingerprint detection event can be triggered, for example, by the user triggering a login request or a payment request. In this scenario, detecting a user triggering a login request or a payment request constitutes a fingerprint detection event.

[0121] S920 receives reflected or scattered light of at least one preset wavelength through the under-display fingerprint module to obtain a reflected or scattered light signal, wherein the reflected or scattered light is the light after the detection light is reflected or scattered by an object.

[0122] The under-display fingerprint module includes a response area for responding to one or more preset wavelengths. After the detection light is reflected or scattered by an object on the display screen, it returns to the under-display fingerprint module, which receives reflected or scattered light of at least one preset wavelength.

[0123] When the detection light includes a preset wavelength, the under-display fingerprint module responds to that preset wavelength. When the detection light includes multiple preset wavelengths or includes a band, the under-display fingerprint module responds to the multiple preset wavelengths or at least one preset wavelength of that band.

[0124] In one example of this application, the detection light includes at least one preset wavelength. If the preset wavelength responded by the under-display fingerprint module is one of these wavelengths, the under-display fingerprint module includes a response area that responds to the preset wavelength.

[0125] In another example of this application, the detection light includes at least two preset wavelengths. If the preset wavelengths responded to by the under-display fingerprint module are two of them, a first preset wavelength and a second preset wavelength, the under-display fingerprint module includes two response regions, one of which responds to the first preset wavelength and the other responds to the second preset wavelength. The two response regions employ methods including, but not limited to, […]. Figures 8A to 8C The arrangement shown is as follows.

[0126] In another example of this application, the detection light includes at least three preset wavelengths. If the preset wavelengths responded to by the under-display fingerprint module are three of these preset wavelengths—a first preset wavelength, a second preset wavelength, and a third preset wavelength—the under-display fingerprint module includes three response regions. One response region responds to the first preset wavelength, the second response region responds to the second preset wavelength, and the third response region responds to the third preset wavelength. The three response regions employ, but are not limited to, the following methods: Figure 11A , Figure 11B , Figure 11C and Figure 11D The arrangement shown is as follows: Figure 11A The ring-shaped distribution shown in the figure, as Figure 11B The chessboard layout shown is as follows: Figure 11C and Figure 11D The blocky distribution shown in the figure.

[0127] It should be understood that in some embodiments of this application, before step S910 begins, the optical sensor of the under-display fingerprint module is in standby mode or power-saving mode. The optical sensor is only activated or in working mode when the electronic device initiates user authentication, starting to collect reflected or scattered light signals and transmitting them to the processor for processing. The processor needs to determine whether the object is a human body and match the collected fingerprint with the registered fingerprint to complete user authentication. Optionally, after completing user authentication, the optical sensor switches to standby mode or power-saving mode to conserve power.

[0128] S930, if the object is determined to be a human body based on the reflected or scattered light signal, then fingerprint recognition is performed based on the reflected or scattered light signal.

[0129] In this embodiment, the detection light emitted by the display panel is reflected or scattered on the surface of an object and then passes through the screen stack to reach the surface of the light sensor. According to the design of the fingerprint module in this application, the reflected or scattered light of different preset wavelengths is imaged in different response areas. Therefore, reflected or scattered light signals of different preset wavelengths are obtained. Thus, liveness detection is performed based on the reflected or scattered light signals of different preset wavelengths.

[0130] The optical sensor receives the energy differences of reflected or scattered light from the peaks and troughs of the fingerprint through its individual pixel photosensitive units, thus forming a grayscale image, i.e., a fingerprint image. If the liveness detection result indicates the finger is genuine, fingerprint recognition is then performed based on the fingerprint image to obtain the recognition result.

[0131] It should be understood that while liveness detection can be achieved using a single preset wavelength, using two or more preset wavelengths will result in higher accuracy. This is because using two or more preset wavelengths allows for the utilization of not only the reflection or scattering spectral characteristics of a single preset wavelength but also the relative reflection or scattering spectral characteristics between two preset wavelengths, thus achieving better accuracy in fingerprint recognition. For example, for a single preset wavelength, one of four wavelengths can be used: 430nm, 520nm, 570nm, or 650nm. For two preset wavelengths, 520nm and 650nm, or any two of the aforementioned four wavelengths, can be used.

[0132] In some embodiments of this application, liveness detection and / or fingerprint recognition can be performed using reflected or scattered light of at least one preset wavelength. That is, when the preset wavelength responded by the under-display fingerprint module is one, liveness detection and / or fingerprint recognition can be performed based on the reflected or scattered light signal of that preset wavelength; when the preset wavelength responded by the under-display fingerprint module is multiple, at least one preset wavelength of reflected or scattered light signal can be selected for liveness detection and / or fingerprint recognition.

[0133] It should be understood that, in the embodiments of this application, no specific limitation is made on the wavelengths and their number used for liveness detection and fingerprint recognition.

[0134] It should also be understood that in some embodiments of this application, whether an object is a human body is determined based on a reflected or scattered light signal of at least one preset wavelength. If the object is determined to be a human body based on the reflected or scattered light signal, a step of fingerprint recognition based on the reflected or scattered light signal is performed, and a result of whether the verification is successful is output based on the fingerprint recognition result. If the object is determined not to be a human body based on a reflected or scattered light signal of at least one preset wavelength, the step of fingerprint recognition based on the reflected or scattered light signal is no longer performed, and a result of unsuccessful fingerprint verification is directly output.

[0135] This application embodiment configures the under-display fingerprint module to respond to at least one preset wavelength of detection light emitted by the display panel. On one hand, it directly utilizes the light source of the electronic device's display panel, eliminating the need for an additional light source, reducing structural design space and cost, simplifying system composition, and facilitating integration. On the other hand, by collecting reflected or scattered light of at least one preset wavelength through a light sensor, it achieves liveness detection and fingerprint recognition, avoiding the need for separate devices for liveness detection and fingerprint recognition, further reducing structural design space and cost, simplifying system composition, and facilitating integration. Furthermore, by simultaneously collecting reflected light of at least two different wavelengths through a light sensor, it avoids sequentially collecting signals from different wavelengths, improving the efficiency of fingerprint recognition.

[0136] Corresponding to the fingerprint detection method described in the above embodiments, Figure 12 A structural block diagram of the fingerprint detection device provided in the embodiments of this application is shown. For ease of explanation, only the parts related to the embodiments of this application are shown.

[0137] Reference Figure 12 The fingerprint detection device is configured in an electronic device, and the fingerprint detection device may include:

[0138] The detection light emission execution module 1301 is used to control the preset area of ​​the display panel to emit detection light including at least one preset wavelength in response to a fingerprint detection event. The detection light is reflected or scattered after illuminating an object covering the preset area.

[0139] The optical signal acquisition module 1302 is used to receive reflected or scattered light of at least one preset wavelength through the under-display fingerprint module to obtain a reflected or scattered light signal. The reflected or scattered light includes the light after the detection light is reflected or scattered by an object. The optical signal acquisition module 1302 can be the optical sensor mentioned above.

[0140] The under-display fingerprint module includes a response area for responding to at least one preset wavelength, and the under-display fingerprint module receives reflected or scattered light of at least one preset wavelength.

[0141] The fingerprint recognition module 1303 is used to perform fingerprint recognition based on the reflected or scattered light signal if the object is determined to be a human body based on the reflected or scattered light signal of a preset wavelength. The fingerprint recognition module 1303 may be a processor.

[0142] Optionally, the fingerprint recognition device may further include:

[0143] Output device, used to output fingerprint recognition results.

[0144] The fingerprint recognition result includes fingerprint recognition failure and fingerprint recognition success. For example, if the processor determines that the object has a valid fingerprint, the fingerprint recognition is successful; otherwise, the fingerprint recognition fails. A valid fingerprint can be a fingerprint that matches a pre-stored fingerprint. The output device can be a display panel.

[0145] Reference Figure 13 Optionally, the fingerprint recognition device may further include:

[0146] The liveness detection module 1304 is used to determine whether the object is a human body based on the reflected or scattered light signal of at least one preset wavelength.

[0147] If the object is determined to be a human body based on the reflected or scattered light signal of at least one preset wavelength, the fingerprint recognition module 1303 will proceed to the next step; if the object is determined not to be a human body based on the reflected or scattered light signal of at least one preset wavelength, the fingerprint recognition failure result will be output.

[0148] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0149] Figure 14This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 14 As shown, the electronic device 15 of this embodiment includes: at least one processor 1400 ( Figure 14 (Only one is shown in the image), memory 1401, computer program 1402 stored in the memory 1401 and executable on the at least one processor 1400, display panel 1403, and fingerprint module 1404, wherein the processor 1400 executes the computer program 1402 to implement the steps in any of the above-described fingerprint detection method embodiments.

[0150] Those skilled in the art will understand that Figure 14 This is merely an example of electronic device 15 and does not constitute a limitation on electronic device 15. It may include more or fewer components than shown, or combine certain components, or different components, such as touch panels, optically transparent structures, etc.

[0151] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the various method embodiments described above.

[0152] This application provides a computer program product that, when run on an electronic device, enables a mobile terminal to execute the steps of the various method embodiments described above.

[0153] If the integrated unit is implemented as 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, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to an electronic device, a recording medium, a computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0154] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0155] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0156] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the system embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0157] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0158] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A fingerprint detection module, characterized in that, Including light sensors and filters, The optical sensor is used to receive reflected or scattered light signals, which are light signals after the detection light is reflected or scattered by an object. The detection light originates from the light source of the display panel of the electronic device. The wavelength band of the detection light and the response wavelength band of the optical sensor have a first intersection, which includes multiple preset wavelengths. Liveness detection based on the reflected or scattered light signals received by the optical sensor includes: distinguishing between real human fingers and prosthetics based on whether the positions of the preset wavelength bands and their mutual reflection characteristics are within the normal range. The optical sensor includes multiple pixel photosensitive units, and the response wavelength band of each pixel photosensitive unit includes one of the multiple preset wavelengths. The filter is disposed between the optical sensor and the display panel. The wavelength band of the detection light, the response wavelength band of the optical sensor, and the light wavelength band allowed by the filter have a second intersection, which includes multiple preset wavelengths.

2. The fingerprint detection module according to claim 1, characterized in that, The filter includes one or more filter structures, and each filter structure allows light to pass through a wavelength range including one of the one or more preset wavelengths; the photosensitive sensor includes one or more pixel photosensitive units, and the response wavelength range of each pixel photosensitive unit includes one of the one or more preset wavelengths.

3. An electronic device, characterized in that, The device includes a display panel and a fingerprint detection module as described in claim 1 or 2, wherein the display panel includes a light source, the light source of which provides the detection light source for the detection module.

4. The electronic device according to claim 3, characterized in that, The light source of the display panel includes a backlight or a self-emissive light source.

5. The electronic device according to claim 3, characterized in that, It also includes a processor, which is used to acquire the reflected or scattered light signal received by the optical sensor and perform fingerprint recognition based on the reflected or scattered light signal.

6. The electronic device according to claim 5, characterized in that, The processor is configured to determine whether the object has a valid fingerprint if the object is determined to be a human body based on the reflected or scattered light signal; and to execute the function corresponding to the valid fingerprint if the object is determined to have a valid fingerprint.

7. The electronic device according to claim 5 or 6, characterized in that, The fingerprint recognition based on the reflected or scattered light signal includes: If the object is determined to be a human body based on the reflected or scattered light signal, then it is determined whether the object has a valid fingerprint based on the reflected or scattered light signal. If it is determined that the object has a valid fingerprint, then the function corresponding to the valid fingerprint is executed.

8. The electronic device according to claim 7, characterized in that, The fingerprint recognition based on the reflected or scattered light signal includes: If the object is determined not to be a human body based on the reflected or scattered light signal, a fingerprint recognition result indicating unsuccessful fingerprint verification is output.

9. The electronic device according to claim 5, 6 or 8, characterized in that, Before acquiring the reflected or scattered light signal received by the optical sensor, the processor is further configured to: In response to a fingerprint detection event, a fingerprint pattern is displayed in a preset area of ​​the display panel.

10. The electronic device according to claim 5, 6 or 8, characterized in that, Before acquiring the reflected or scattered light signal received by the optical sensor, the processor is further configured to: In response to a fingerprint detection event, the display panel controls a portion of its light sources to emit the detection light, wherein the portion of the light sources is a light source corresponding to a preset area of ​​the display panel's light sources.

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