In-screen biological feature detection device and electronic equipment

Abstract

The invention relates to an in-screen biological characteristic detection device, which is used for carrying out biological characteristic detection on a living body in contact with a display screen, and comprises the display screen which comprises a plurality of display pixels and at least one photosensitive pixel which are arranged in an array. The display pixels are used for emitting display light; the photosensitive pixel is arranged between two adjacent display pixels and is used for sensing a target light signal which is returned from a living body and is transmitted into the display screen. And the memory is used for storing the sensed target optical signal information and a control program instruction of the display pixel. The controller is used for executing the control program instruction to control the display pixel to emit a required measurement light signal during biological characteristic detection; and a processor configured to process and analyze the sensed target light signal to obtain the biological characteristics of the organism. The invention further relates to electronic equipment.

Description

Technical Field

[0001] The present application relates to the field of biometric detection technology, and in particular to an in-screen biometric detection device and electronic device. Background Art

[0002] With the promotion of electronic devices, people are paying more and more attention to their own health. In recent years, portable biometric measurement devices, such as heart rate, heart rate variability, blood pressure and blood oxygen, have gradually become popular in the consumer electronics market. Photoplethysmogram (PPG) is an organ volume tracing obtained optically, generally achieved by irradiating the skin with a pulse oximeter and measuring the change in light absorption.

[0003] The photoplethysmography method measures the light of a specific wavelength (such as 523nm green light, 660nm red light, 940nm near-infrared light) irradiated to the biological tissue (either transmitted or reflected). Due to the influence of the pulse movement, the blood and other tissue fluids in the organism will undergo significant changes, resulting in significant changes in the light signal (transmitted light or reflected light) received by the photosensitive pixel 160, which is used to detect the heart activity of the organism. In medicine, PPG can usually measure the fingertips, earlobes, wrists and other positions of a person to obtain effective heart activity signals, such as heart rate and heart rate variability caused by heart contraction and relaxation, as well as the relative blood oxygen saturation or blood pressure of oxygenated hemoglobin to total hemoglobin content in the blood.

[0004] At present, the devices that use photoplethysmography to detect biometric features are mainly encapsulated in a transparent (transparent to visible light and near-infrared light) glass or plastic. However, as the screen-to-body ratio of electronic products gradually increases and the assembly space of the whole machine becomes more and more compact, it also poses great difficulties to the appearance and geometric design of the whole machine. In addition, the optical signal used for measurement is easily disturbed by the environment, resulting in inaccurate measurement. Summary of the invention

[0005] In view of this, the embodiments of the present application provide a biometric detection device and an electronic device to solve the technical problems that the existing technology of using photoplethysmography to detect biometrics requires occupying the screen space of the electronic device and the measurement is inaccurate.

[0006] The technical solution adopted in this application is:

[0007] In a first aspect, the present application provides an in-screen biometric detection device for performing biometric detection on a biological body in contact with a display screen, comprising:

[0008] A display screen, comprising a plurality of display pixels arranged in an array, wherein the display pixels are used to emit display light;

[0009] At least one photosensitive pixel is disposed between two adjacent display pixels and is used to sense a target light signal that is transmitted back from the organism and enters the display screen;

[0010] A memory, used to store the sensed target light signal information and control program instructions for display pixels;

[0011] A controller, configured to execute the control program instructions to control the display pixels to emit the required measurement light signals when performing biometric detection; and

[0012] The processor is configured to process and analyze the sensed target light signal to obtain the biological characteristics of the organism.

[0013] Optionally, the controller sends a synchronization control signal according to the frequency and phase of the target optical signal, and the synchronization control signal is used to control the light source to emit a measurement optical signal that is synchronized with the frequency and phase of the target optical signal.

[0014] Optionally, the processor is specifically configured to perform accumulation processing and / or average processing on the acquired target light signal to obtain processed target light signal data.

[0015] Optionally, the processor is further configured to obtain a spectrum peak value of the measurement light signal, and filter ambient light noise in the target light signal according to the spectrum peak value of the measurement light signal.

[0016] Optionally, the wavelength of the target light signal retained in filtering the ambient light noise in the target light signal according to the spectrum peak of the measurement light signal is greater than or equal to 500 nm and less than or equal to 600 nm.

[0017] Optionally, the processor is further used to obtain a biometric image of the organism according to the target light signal, and perform identity recognition by comparing it with a biometric template.

[0018] In a second aspect, the present application further provides an electronic device, which includes the biometric detection device described in the first aspect.

[0019] Optionally, the electronic device further comprises a display screen driver, the display screen driver is electrically connected to the signal synchronizer, and the display screen driver is used for driving the display screen to emit the measurement light signal according to a synchronization control signal sent by the signal synchronizer.

[0020] Optionally, the area where the display screen emits the measurement light signal is a circular area or a rectangular area located on both sides of the photosensitive pixel 160 or an area where the display screen contacts the biological body.

[0021] Beneficial effect: The in-screen biometric detection device of the present application solves the technical problem that the devices related to the collected photoplethysmography signals occupy the display screen by collecting the photoplethysmography signals inside the display screen, so that the size of the display screen is not affected by the related devices, which is useful for improving the screen-to-body ratio of electronic devices. At the same time, the application uses a synchronous control signal to modulate the measurement light signal emitted by the light source to the organism, so that it is synchronized with the frequency and phase of the related devices receiving the photoplethysmography signals, thereby effectively eliminating the influence of ambient light and making the measurement of the characteristics of the organism more accurate.

[0022] The biometric detection device and electronic device of the present application collects the photoplethysmography signal by setting the photosensitive pixel 160 below the display screen, thereby avoiding the photosensitive pixel 160 from occupying the display screen space, and effectively improving the screen-to-body ratio of the electronic device. At the same time, a signal synchronizer is used to control the light source to emit a measurement light signal that is synchronized with the frequency and phase of the photosensitive pixel 160, thereby effectively eliminating the influence of ambient light and making the measurement of biological characteristics more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work, and these are all within the protection scope of the present application.

[0024] Figure 1 A schematic diagram of the structure of an in-screen biometric detection device provided in an embodiment of the present application applied to an electronic device;

[0025] Figure 2 for Figure 1 A schematic diagram of functional modules of the in-screen biometric detection device;

[0026] Figure 3 A flow chart of the biometric detection method of the present application;

[0027] Figure 4 A flow chart of a method for collecting target optical signals for this application;

[0028] Figure 5 A flow chart for filtering a target light signal according to a spectral peak of the target light signal for this application;

[0029] Figure 6 A schematic diagram of a functional module of a controller described in an embodiment of the present application;

[0030] Figure 7A schematic diagram of a functional module of a controller described in an embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described in conjunction with the drawings in the embodiment of the present application. It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. Moreover, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "comprising..." do not exclude the existence of other identical elements in the process, method, article or device comprising the elements. If there is no conflict, the embodiments of the present application and the various features in the embodiments can be combined with each other, all within the scope of protection of the present application.

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of the in-screen biometric detection device 10 provided in an embodiment of the present application applied to an electronic device 1. Figure 2 It is a schematic diagram of functional modules of the in-screen biometric detection device 10 provided in an embodiment of the present application applied to an electronic device 1.

[0033] Reference Figure 1 and Figure 2The electronic device 1 includes an in-screen biometric detection device 10, which is used to perform biometric detection on a biological body in contact with a display screen. The in-screen biometric detection device 10 includes a display screen 14, a memory 16, a controller 17 and a processor 18. The display screen 14 includes a display surface 142, and the display screen 14 emits visible light through the display surface 142 to display a picture. The controller 17 controls the display screen 14 to emit the required measurement light signal to illuminate the biological body 2 during detection. The display screen 14 includes display pixels 140 and at least one photosensitive pixel 160. The display pixels 140 are arranged in an array and are used to emit display light. The photosensitive pixel 160 is arranged between two adjacent display pixels 140 and is used to sense the target light signal that is transmitted back from the biological body into the display screen 14. The memory 16 is used to store the sensed target light signal information and the control program instructions of the display pixels. The controller 17 is used to execute the control program instructions to control the display pixels to emit the required measurement light signal when performing biometric detection. The processor 18 is configured to process and analyze the sensed target light signal to obtain the biological characteristics of the biological body.

[0034] Specifically, for example, each display pixel 140 includes corresponding sub-pixels 1400 for emitting red, green, and blue visible light, respectively. A specific area can be allocated in the display pixel 140 for setting the photosensitive pixel 160, and the photosensitive pixels 160 corresponding to the plurality of display pixels 140 can form a photosensitive pixel array to receive the target light signal returned by the finger 2.

[0035] The biological body 2 is, for example, but not limited to, different parts of the user's body with blood vessels, such as fingers, wrists, forehead, ears, arms, etc. The electronic device 1 is, for example, but not limited to, different types of electronic products, such as consumer electronic products, home electronic products, vehicle-mounted electronic products, and medical equipment. Consumer electronic products are, for example, mobile phones, tablet computers, laptops, desktop monitors, all-in-one computers, and various types of wearable devices, such as smart watches, headphones, headbands, necklaces, earrings, rings, bracelets, etc. Home electronic products are, for example, smart door locks, televisions, refrigerators, mattresses, etc. Vehicle-mounted electronic products are, for example, multi-function steering wheels, vehicle-mounted touch interactive devices, etc. Medical equipment is, for example, portable oximeters, vital signs monitoring systems, etc.

[0036] The following description will take the biological body 2 as a user's finger, and the biometric detection is performed by touching the finger 2 as an example.

[0037] Optionally, in some embodiments, the target light signal may be converted into a corresponding photoplethysmography (PPG) signal. The processor 18 calculates the blood oxygen saturation value of the organism 2 according to the detected PPG signal of the organism 2. Thus, the in-screen biological detection device 10 can conveniently detect the user's blood oxygen by using the visible light emitted by the display screen 14 as the detection light.

[0038] Optionally, in some embodiments, the in-screen biological detection device 10 may further include a protective layer 11. The protective layer 11 may be, for example, disposed on the display surface 142 of the display screen 14 to protect the display screen 14 from damage. The protective layer 11 may include a transparent material, such as but not limited to transparent glass, transparent polymer, etc. The protective layer 11 transmits light for displaying the picture emitted by the display screen 142. The protective layer 11 may be a single-layer structure or a multi-layer structure. The protective layer 11 is roughly a thin plate with a predetermined length, width, and thickness. It is understandable that the protective layer 11 may include a plastic film, a tempered film, or other film layers attached by the user during actual use. The outer surface 110 of the protective layer 11 is the outermost surface of the electronic device 1. When performing the detection, the user's finger 2 may directly contact the outer surface 110 of the protective layer 11.

[0039] Optionally, in some embodiments, the display screen 14 may be an active light-emitting display screen, such as but not limited to an organic light-emitting diode (OLED) display screen or a micro-light-emitting diode (Micro-LED) display screen. The display screen 14 includes a plurality of display pixels 140, and the display pixels 140 are used to emit visible light to display a picture. At least part of the display pixels 140 are detection light pixels, which are also used to emit visible light detection light to illuminate the user's finger 2 during blood oxygen detection, and the wavelength of the detection light is selected in the range of 380 nanometers (nm) to 800nm.

[0040] The position where the photosensitive pixel 160 is set in the display screen 14 is the sensing area 112. When performing detection, the user touches the sensing area 112 of the protective layer 11 or the display screen 14 with the finger 2, and the controller 17 controls the display screen 14 to emit a measurement light signal to illuminate the user's finger 2 in contact with the sensing area 112. The target light signal returned by the user's finger 2 is returned from the sensing area 112, so that it can be received by the photosensitive pixel 160 and converted into a corresponding PPG signal. Optionally, the sensing area 112 is located within the display area of ​​the display screen 14. Alternatively, the sensing area 112 is the same as the display area of ​​the display screen 14.

[0041] like Figure 3 As shown, in some embodiments, the controller 17 is configured to perform a biometric detection method, the method comprising the following steps:

[0042] S1: Sending a synchronization control signal according to the frequency and phase of the target light signal 3, wherein the synchronization control signal is used to control the display pixel 140 to emit a measurement light signal 5 synchronized with the frequency and phase of the target light signal 3;

[0043] In this step, the display pixel 140 that can be controlled to emit light emits a signal of specific intensity, wavelength, time and modulation frequency to the detected organism 2. The signal is the aforementioned measurement light signal 5, wherein the frequency and phase of the measurement light signal 5 are determined by the frequency and phase of the target light signal 3. The aforementioned target light signal 3 refers to the light signal collected by the on-screen biometric detection device 10. The frequency and phase of the target light signal 3 are determined by the frequency and phase of the photosensitive pixel 160 that receives the light signal when it is working. In the embodiment, the frequency and phase of the target light signal 3 can be synchronized with the frequency and phase of the photosensitive pixel 160 when it is working. In this regard, the embodiment can first determine the frequency and phase of the target light signal 3 according to the frequency and phase of the photosensitive pixel 160 when it is working. Then, a corresponding synchronization control signal is generated according to the frequency and phase of the target light signal 3, and the display pixel 140 is controlled by the synchronization control signal to emit the measurement light signal 5 to the detected organism, and the frequency and phase of the measurement light signal 5 reflected by the display pixel 140 are synchronized with the frequency and phase of the photosensitive pixel 160 when it is working.

[0044] In addition, the following steps are included before this step:

[0045] S01: Start the biological feature detection program;

[0046] S02: determining whether the surface of the biological body correctly contacts the designated area of ​​the screen of the measuring device;

[0047] When the surface of a biological body contacts the designated area of ​​the screen of the measuring device, formal detection begins, and the display pixels 140 are controlled to emit a measuring light signal 5 to the biological body.

[0048] S2: collecting the target light signal 3 below the display screen 6, wherein the target light signal 3 is a photoplethysmography signal obtained by the measurement light signal 5 being reflected and / or transmitted through biological tissue;

[0049] like Figure 2As shown, after the measurement light signal 5 emitted by the display pixel 140 reaches the biological tissue, such as the blood vessel 7, it enters the display screen 14 of the electronic device after being reflected and / or transmitted by the biological tissue. This step adopts the method of collecting the target light signal 3 inside the display screen, which does not occupy the space of the display screen 6. In order to accurately detect the biological characteristics of the organism, this step can collect the photoplethysmographic signal that changes with time to obtain the information of the photoplethysmographic signal that changes with time. During the specific collection, the target light signal 3 is continuously collected by the photosensitive pixel 160, and multiple frames of images containing the target light signal 3 can also be collected by the photosensitive pixel 160.

[0050] S3: Determine the biological characteristics of the organism based on the target light signal 3.

[0051] This step processes and analyzes the collected target light signal 3, and obtains the biological characteristics of the detected organism through the time domain or frequency domain information of the target light signal 3. The biological characteristics include but are not limited to heart rate, heart rate variability, blood oxygen, blood pressure, biological activity, etc. The process of heart rate detection is that when the measurement light signal 5 of a certain wavelength is irradiated on the skin surface, the light signal will be transmitted to the photosensitive pixel 160 by transmission or reflection. During this process, due to the attenuation effect of skin muscle and blood absorption, the intensity of light monitored by the photosensitive pixel 160 will be weakened. The reflection of light by the skin, bones, meat, fat, etc. of the human body is a fixed value, while the capillaries 7 and arteries and veins change periodically with the pulse volume under the action of the heart. When the heart contracts, the peripheral blood volume is the largest, the light absorption is also the largest, and the detected light intensity is the smallest; while when the heart is diastolic, on the contrary, the detected light intensity is the largest, so that the light intensity received by the photosensitive pixel 160 changes pulsatingly. The heart rate of the detected organism can be obtained by counting the cycles of the detected target light signal 3 in the strong and weak conversion.

[0052] The principle of blood oxygen detection is as follows: oxygen is transported in the blood in the vast majority in the form of binding to hemoglobin, i.e. oxygen (O2) binds to hemoglobin (Hb) to generate oxygenated hemoglobin (HbO2). Therefore, hemoglobin (Hb) and oxygenated hemoglobin (HbO2) exist in the blood. When the light beam passes through the blood vessel 7, the two substances have different degrees of light absorption. By selecting the wavelengths with the largest difference in absorbance between the two substances, for example, 660nm and 940nm are usually selected. At 660nm and 940nm, equations are established for the degree of light absorption, respectively, to calculate the concentration of oxygenated hemoglobin (HbO2).

[0053] The principle of blood pressure detection is to obtain a specific calculation formula by analyzing characteristic parameters such as the rising slope and band time of the pulse wave to estimate the blood pressure value.

[0054] This embodiment may also use a filtering algorithm to remove noise caused by factors such as the external environment, movement, and optical crosstalk before analyzing the target optical signal 3 .

[0055] In this embodiment, if Figure 4 As shown, the S2: collecting the target light signal 3, wherein the target light signal 3 is a photoplethysmography signal obtained by the measurement light signal 5 through reflection and / or transmission of biological tissue, further comprises the following steps:

[0056] S21: Scanning the photosensitive pixels 160 to obtain the target light signal 3 received by the partial area;

[0057] When external light irradiates the photosensitive pixel 160, a photoelectric effect occurs, and corresponding charges are generated in the pixel unit. The row selection logic unit selects the corresponding row pixel unit as needed. The image signal in the row pixel unit is transmitted to the corresponding analog signal processing unit and the A / D converter through the signal bus of the respective column, and is converted into a digital image signal output. The row selection logic unit can scan the pixel array row by row or alternately. The row selection logic unit and the column selection logic unit can be used in conjunction to realize the window extraction function of the image. In this step, only the part of the area containing the valid photoplethysmography signal in the photosensitive pixel 160 is scanned, that is, only the image signal corresponding to the pixel unit that receives the valid photoplethysmography signal is converted into a digital image signal output, thereby reducing the amount of data and the time for data processing and transmission while ensuring the validity of the data.

[0058] S22: performing simplified processing on the acquired target light signal 3 to obtain processed target light signal data;

[0059] In this step, the target light signal 3 is simplified at the chip end of the photosensitive pixel 160, thereby reducing the amount of data to be subsequently processed and transmitted. The simplified processing method includes performing cumulative processing or averaging processing on the target light signal 3. After cumulative processing or averaging processing, multiple data are simplified into one data to represent, thereby greatly simplifying the data while ensuring effective information.

[0060] S23: Send the simplified target light signal 3 data to the processor.

[0061] After the simplified processing, the amount of data is greatly reduced. At this time, the simplified target optical signal 3 data is transmitted, which can significantly reduce the data transmission time.

[0062] In this embodiment, if Figure 5As shown, the S2: collecting the target light signal 3, wherein the target light signal 3 is a photoplethysmography signal obtained by the measurement light signal 5 through reflection and / or transmission of biological tissue, further comprises the following steps:

[0063] S201: Acquire the spectrum peak value of the display pixel 140;

[0064] S202: filtering the ambient light noise in the target light signal 3 according to the spectral peak of the display pixel 140;

[0065] In this step, the wavelength center and bandwidth of the optical signal retained in filtering are selected according to the spectral peak of the display pixel 140, so that the ambient light with a significant difference from the spectral peak of the display pixel 140 is filtered out, thereby significantly improving the signal-to-noise ratio.

[0066] S203: Collect the filtered target light signal 3.

[0067] As an optional method, in this embodiment, the wavelength of the target optical signal 3 retained in step S202 is greater than or equal to 500nm and less than or equal to 600nm. Using the measurement optical signal 5 in the aforementioned range can effectively filter out stray light and ensure that enough optical signals can be collected after passing through the display screen 6.

[0068] In some embodiments, Figure 6 As shown, the controller 17 includes a signal synchronizer. The signal synchronizer is used to send a synchronization control signal according to the frequency and phase of the target light signal 3, and the synchronization control signal is used to control the display pixel 140 to emit the measurement light signal 5 synchronized with the frequency and phase of the target light signal 3;

[0069] This embodiment can adopt the solution of independent photosensitive pixels 160 and add a signal synchronizer 9, wherein the signal synchronizer 9 can adopt a phase-locked loop, which is a negative feedback control system that uses the voltage generated by phase synchronization to tune the voltage-controlled oscillator to generate the target frequency. The phase-locked loop includes a phase detector, a low-pass filter, a voltage-controlled oscillator and a frequency divider. The phase detector, the filter and the voltage-controlled oscillator form a forward path, and the frequency divider forms a feedback path of the frequency phase.

[0070] The phase detector detects the phase difference between the input reference signal (from a frequency-stable crystal oscillator) and the signal of the feedback loop, and converts the detected phase difference signal into a voltage signal output.

[0071] The voltage-controlled oscillator outputs a periodic signal of the corresponding frequency according to the input voltage. It is constructed by using an LC resonant circuit composed of a varactor diode and a capacitor. When the reverse bias of the varactor diode is increased, the depletion layer in the diode becomes larger, the band gap becomes smaller, and the resonant frequency of the LC circuit increases. Conversely, when the reverse bias is reduced, the capacitance in the diode increases and the frequency decreases. The voltage-controlled oscillator can be a module, an IC, or made of discrete components.

[0072] The frequency divider reduces the output of the voltage controlled oscillator to the same level as the reference signal and then compares it in the phase detector.

[0073] This embodiment uses a synchronizer to synchronize the transmission and reception frequency and phase of the optical signal, so that more accurate measurement can be achieved.

[0074] As an optional method, the frequency modulated by the signal synchronizer 9 avoids the 50 / 60 Hz AC frequency, thereby reducing the interference of luminous signals from household appliances (such as fluorescent lamps).

[0075] In this embodiment, the photosensitive pixel 160 is used to collect the target light signal 3, which is a photoplethysmography signal obtained by the measurement light signal 5 being reflected and / or transmitted through the biological tissue;

[0076] In addition, in this embodiment, a filter device can be arranged between the photosensitive pixel 160 and the display screen 6 to filter out ambient light. For example, a filter 1 with a specific wavelength band is arranged on the side of the photosensitive pixel 160 facing the display screen 6, or a filter layer with a specific wavelength band is plated on the light incident surface of the photosensitive pixel 160, so that the target light signal 5 is filtered out before being received by the photosensitive pixel 160, so that the signal-to-noise ratio is significantly improved. The passing wavelength band of the filter device can be set according to the light-emitting display pixel 140, for example, the wavelength center and bandwidth of the light passing through the filter device are selected according to the peak value of the emission spectrum.

[0077] The processor may be a central processing unit (CPU), or other general-purpose processors, single-chip microcomputers, ARM, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0078] The on-screen biometric detection device 10 of this embodiment can first simplify the target light signal 3 at the chip end, thereby reducing the amount of data for subsequent processing and transmission. The simplified processing method includes performing cumulative processing or averaging processing on the target light signal 3. After cumulative processing or averaging processing, multiple data are simplified into one data to represent, thereby greatly simplifying the data while ensuring effective information, and significantly improving the signal acquisition speed.

[0079] like Figure 6 and Figure 7 As shown, in some embodiments, the electronic device further includes a display screen driver 8, wherein the display screen driver 8 can drive the display screen 6 to emit light at a certain frequency and phase. The display screen driver 8 is electrically connected to the signal synchronizer 9. The display screen 6 of the electronic device can be used as a display pixel 140 for biometric detection. The display screen driver 8 is used to drive the screen to emit the measurement signal. When the signal synchronizer 9 of the biometric detection device in the electronic device can be connected to the photosensitive pixel 160 and the display screen driver 8 respectively, the signal synchronizer 9 controls the display screen driver 8 according to the frequency and phase of the target light signal 3 received by the photosensitive pixel 160, so that the display screen driver 8 drives the screen to emit light at the same frequency and phase as the photosensitive pixel 160, thereby synchronizing the emission and reception frequency and phase of the measurement light signal 5, and achieving more accurate measurement.

[0080] The display screen 6 may be an organic light-emitting diode (OLED) display screen 6 or a micro-LED display screen 6. When the OLED display screen 6 is used in this embodiment, the biometric detection device may use the display unit (i.e., OLED display pixel 140) of the OLED display screen 6 located in the detection area as an excitation display pixel 140 for detecting biometrics. When a finger or other biological body part is pressed on the detection area, the display screen 6 sends a measurement light signal 5 to the organism to be detected above the biometric measurement area, and the light signal enters the bottom of the display screen 6 after being reflected or transmitted by the organism. In other alternative embodiments, the display screen 6 may also be a liquid crystal display 6 (LCD) or other passive light-emitting display screen 6.

[0081] The area where the display screen 6 emits the measurement signal is the area where the display screen 6 contacts the biological body, such as a circular or square area of ​​a fingerprint pressing area. It can also be a rectangular area located on both sides of the photosensitive pixel 160 to reduce the interference of stray light above the photosensitive pixel 160 on the effective signal.

[0082] The processor is used to determine the biological characteristics of the organism according to the target light signal 3. The photosensitive pixel 160 collects the photoplethysmography signal and transmits it to the processor for processing to obtain the biological characteristics of the organism, wherein the biological characteristics include but are not limited to heart rate, heart rate variability, blood oxygen, blood pressure, biological activity, etc.

[0083] In addition, in combination with the biometric detection method in the above embodiment, the embodiment of the present application can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by a processor, any one of the image printing data processing methods in the above embodiment is implemented.

[0084] The above is a detailed introduction to the biometric detection method, device, electronic device and storage medium provided in the embodiments of the present application.

[0085] It should be clear that the present application is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present application.

[0086] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present application are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0087] It should also be noted that the exemplary embodiments mentioned in this application describe some methods or systems based on a series of steps or devices. However, this application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiment, or in a different order from the embodiment, or several steps can be performed simultaneously.

[0088] The above is only a specific implementation of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, modules and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the protection scope of this application.

Claims

1. An on-screen biometric detection device for detecting biometric characteristics of a living being in contact with a display screen, characterized in that: include: A display screen, comprising a plurality of display pixels arranged in an array and at least one photosensitive pixel, wherein the display pixels are used to emit display light, and the photosensitive pixel is arranged between two adjacent display pixels and is used to sense a target light signal transmitted back from a biological body and entering the display screen; A memory, used to store the sensed target light signal information and control program instructions for display pixels; A controller, used to execute the control program instructions to control the display pixels to emit the required measurement light signals when performing biometric detection; and The processor is configured to process and analyze the sensed target light signal to obtain the biological characteristics of the organism.

2. The on-screen biometric detection device according to claim 1, characterized in that: The controller sends a synchronization control signal according to the frequency and phase of the target optical signal, and the synchronization control signal is used to control the light source to emit a measurement optical signal that is synchronized with the frequency and phase of the target optical signal.

3. The on-screen biometric detection device according to claim 1, characterized in that: The target light signal is a photoplethysmography signal obtained by the measurement light signal being reflected and / or transmitted through biological tissue.

4. The on-screen biometric detection device according to claim 3, characterized in that: The processor is specifically used to perform accumulation processing and / or average processing on the acquired target light signal to obtain processed target light signal data.

5. The in-screen biometric detection device according to any one of claims 1 to 4, characterized in that: The processor is further configured to obtain a spectrum peak value of the measurement light signal, and filter ambient light noise in the target light signal according to the spectrum peak value of the measurement light signal.

6. The on-screen biometric detection device according to claim 5, characterized in that: The wavelength of the target light signal retained in filtering the ambient light noise in the target light signal according to the spectrum peak of the measurement light signal is greater than or equal to 500 nm and less than or equal to 600 nm.

7. The on-screen biometric detection device according to claim 6, characterized in that: The processor is used to convert the target light signal into a corresponding photoplethysmogram signal, and calculate the blood oxygen saturation value of the organism based on the signal.

8. An electronic device, characterized in that: The invention comprises the in-screen biometric detection device as described in any one of claims 1 to 7, wherein the display screen serves as a light source of the biometric detection device.

9. The electronic device according to claim 8, characterized in that: It also includes a display screen driver, which is electrically connected to the signal synchronizer and is used to drive the display screen to emit a measuring light signal according to a synchronization control signal sent by the signal synchronizer.

10. The electronic device according to claim 8, characterized in that: The area where the display screen emits the measurement light signal is a circular area or a rectangular area located on both sides of the photosensitive pixel 160 or an area where the display screen contacts the biological body.

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