WO2022170536A1 - 指纹检测装置、电子设备以及血压检测方法 - Google Patents

指纹检测装置、电子设备以及血压检测方法 Download PDF

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Publication number
WO2022170536A1
WO2022170536A1 PCT/CN2021/076401 CN2021076401W WO2022170536A1 WO 2022170536 A1 WO2022170536 A1 WO 2022170536A1 CN 2021076401 W CN2021076401 W CN 2021076401W WO 2022170536 A1 WO2022170536 A1 WO 2022170536A1
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Prior art keywords
ppg signal
user
display screen
fingerprint
blood pressure
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PCT/CN2021/076401
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English (en)
French (fr)
Inventor
陈淡生
汪海翔
李传林
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深圳市汇顶科技股份有限公司
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Priority to PCT/CN2021/076401 priority Critical patent/WO2022170536A1/zh
Publication of WO2022170536A1 publication Critical patent/WO2022170536A1/zh

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
    • A61B5/021—Measuring pressure in heart or blood vessels

Definitions

  • the present application relates to the field of electronic technology, and more particularly, to a blood pressure detection method, device, and electronic device.
  • the mature blood pressure detection methods on the market are cuffed detection methods based on auscultation or oscillometric methods.
  • auscultation requires a professional operator to judge blood pressure based on the sound of blood flow in the brachial artery, which is suitable for medical scenarios;
  • the oscillometric method is to first inflate the cuff to block the arterial blood flow, and then detect the gas pressure in the cuff and extract the weak pulse wave during the exhaust process, and detect it according to the change of the pulse wave with the pressure in the cuff. blood pressure value.
  • the accuracy of blood pressure measurement and the portability of the blood pressure monitor are very important.
  • the blood pressure monitor with a cuff-type detection method is more accurate, it is bulky and inconvenient to carry, and cannot be used for all-weather monitoring. Blood pressure monitoring cannot meet the needs of hypertensive patients. Therefore, how to facilitate users to perform all-weather blood pressure monitoring has become an urgent problem to be solved.
  • Embodiments of the present application provide a fingerprint detection device, an electronic device, and a blood pressure detection method, which can facilitate users to perform all-weather blood pressure monitoring.
  • a fingerprint detection device which is suitable for an electronic device with a display screen, the fingerprint detection device is arranged below the display screen and is used for blood pressure detection, the electronic device includes a light source, and the light source It includes a first light source and a second light source, wherein the fingerprint detection device is used to receive a first light signal reflected by the user's finger and passing through the display screen at a first moment, and the first light signal is the The optical signal of the first wavelength emitted by the first light source; the fingerprint detection device is used for receiving the second optical signal reflected by the user's finger and passing through the display screen at the second moment, and the second optical signal is the an optical signal of a second wavelength emitted by the second light source; wherein the first wavelength is different from the second wavelength, the first optical signal is used to obtain the first PPG signal, and the second optical signal is used to obtain the first PPG signal.
  • a second PPG signal is acquired, the first PPG signal and the second PPG signal are used to acquire a third PPG
  • an electronic device including a display screen, and the fingerprint detection device according to the first aspect, wherein the fingerprint detection device is arranged below the display screen and is used for blood pressure detection.
  • a third aspect provides a blood pressure detection method, comprising:
  • the fingerprint detection device receives a first optical signal reflected by the user's finger and passing through the display screen, where the first optical signal is an optical signal of a first wavelength emitted by a first light source, and the first optical signal Used to obtain the first PPG signal; at the second moment, the fingerprint detection device receives the second light signal reflected by the user's finger and passing through the display screen, and the second light signal is the first light signal emitted by the second light source.
  • a two-wavelength optical signal the second optical signal is used to obtain a second PPG signal; a third PPG signal is obtained according to the first PPG signal and the second PPG signal, wherein the third PPG signal is used to obtain The blood pressure of the user is acquired, the first wavelength is different from the second wavelength.
  • the PPG signal is obtained by using the under-screen fingerprint detection device, and the user's blood pressure is further obtained. Since the electronic equipment equipped with the under-screen fingerprint detection device is small and easy to carry, it is convenient for the user to perform all-weather blood pressure detection. .
  • at least two light sources with different wavelengths are used to obtain PPG signals of different wavelengths, and PPG signals closer to deep blood vessels are further obtained through at least two PPG signals of different wavelengths, so that the finally obtained blood pressure is closer to the true value.
  • the fingerprint detection device is also used for blood pressure detection, so there is no need to set up an additional blood pressure detection device, which can greatly reduce the cost of electronic equipment.
  • FIG. 1 is a schematic structural diagram of an electronic device to which the fingerprint detection device provided by the embodiment of the present application is applied.
  • FIG. 2 is a schematic sectional view of an electronic device to which the fingerprint detection device provided in the implementation of the present application is applicable.
  • Figure 3 is a schematic diagram of the transverse arch artery of the palm of the finger.
  • FIG. 4 is a schematic diagram of a tangent method for obtaining whether the pressing area of the finger pressing the display screen includes the center of the fingerprint according to the fingerprint image.
  • FIG. 5 is a schematic flowchart of a blood pressure detection method provided by an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of another blood pressure detection method provided by an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another blood pressure detection method provided by an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another blood pressure detection method provided by an embodiment of the present application.
  • the present application provides a fingerprint detection device, which is suitable for electronic equipment with a display screen, and the fingerprint detection device is arranged on the display screen.
  • the lower part of the screen is used for blood pressure detection
  • the electronic device includes a light source
  • the light source includes a first light source and a second light source
  • the fingerprint detection device is used to receive the reflection from the user's finger and wear it at the first moment.
  • a first optical signal passing through the display screen where the first optical signal is an optical signal of a first wavelength emitted by the first light source;
  • the fingerprint detection device is configured to receive a second optical signal reflected by the user's finger and passing through the display screen at a second moment, where the second optical signal is an optical signal of a second wavelength emitted by the second light source ;
  • the first wavelength is different from the second wavelength
  • the first optical signal is used to obtain a first PPG signal
  • the second optical signal is used to obtain a second PPG signal
  • the first PPG signal and the The second PPG signal is used to obtain a third PPG signal
  • the third PPG signal is used to obtain the blood pressure of the user.
  • an off-screen fingerprint detection device is used to obtain a Photoplethysmography (PPG) signal, and further to obtain the user's blood pressure. Since the electronic equipment equipped with the off-screen fingerprint detection device is small and easy to carry, it can It is convenient for users to carry out all-weather blood pressure detection.
  • at least two light sources with different wavelengths are used to obtain PPG signals of different wavelengths, and PPG signals closer to deep blood vessels are further obtained through at least two PPG signals of different wavelengths, so that the finally obtained blood pressure is closer to the true value.
  • the fingerprint detection device is also used for blood pressure detection, so there is no need to set up an additional blood pressure detection device, which can greatly reduce the cost of electronic equipment.
  • FIG. 1 is a schematic diagram of an electronic device to which a fingerprint detection apparatus according to an embodiment of the present application is applied
  • FIG. 2 is a cross-sectional view of the electronic device shown in FIG. 1
  • the electronic device 100 includes a fingerprint detection device 101 and a display screen 102 , and the fingerprint detection device 101 is disposed below the display screen 102 for blood pressure detection.
  • the fingerprint detection device 101 may be disposed below the fingerprint detection area (not shown in FIG. 1 ) of the display screen 102 , for acquiring fingerprint information of a finger or blood pressure information of a user.
  • the electronic device 100 may further include 103 a protective cover plate, and the protective cover plate 103 is arranged above the display screen 102 to protect the display screen.
  • the protective cover plate 103 may be a glass cover plate or a sapphire cover plate, etc. .
  • the fingerprint detection device 101 includes a pixel unit array (not shown in FIG. 1 ), the pixel unit array includes a plurality of pixel units, and the pixel units are used for receiving optical signals and converting them into corresponding electrical signals, such as PPG Signal, pixel of the fingerprint image.
  • the electronic device 100 includes a light source, and the light source may be a light-emitting pixel 1021 of a display screen 102, and the display screen 102 is a self-luminous display screen, such as an OLED display screen.
  • the light-emitting pixels of the display screen can be directly used as the excitation light source for blood pressure detection or fingerprint detection, and no additional light source is required, which can reduce the cost.
  • using the light-emitting pixels of the display screen as the excitation light source can emit light more uniformly and obtain more accurate results.
  • the blood pressure value may make the fingerprint detection result more accurate.
  • the light-emitting pixels of the OLED display screen include red, blue and green light-emitting pixels, which can be used as excitation light sources for blood pressure detection or fingerprint detection.
  • different light sources can be illuminated in time-sharing.
  • light sources with different wavelengths can be used to emit light at the first moment and the second moment, and the fingerprint detection device 101 receives the light at the first moment and the second moment.
  • the light signal emitted by the corresponding light source is time-divisionally illuminated by light sources with different wavelengths, which can further obtain the PPG signal closer to the deep blood vessels, so that the final blood pressure is closer to the true value.
  • a certain color or a certain wavelength of light source can be used for lighting, or multiple colors or multiple wavelengths of light source can be used for lighting at the same time, because fingerprint detection mainly detects the user's finger.
  • the valley ridge pattern information does not need to obtain the information of the deep blood vessels, only a certain color is used for lighting, or the light source of multiple colors is used for lighting at the same time, which can further improve the efficiency of fingerprint detection and improve the user experience.
  • an additional light source may be provided, and the light source may be arranged below the display screen or side by side with the display screen. limit. It can be understood that light sources with different colors have different luminous wavelengths.
  • the first light source is a red light source
  • the second light source is a blue light source or a green light source.
  • the red light source is the red light-emitting pixel in the display screen 102. Due to the strong penetrating ability of the red light, it can reach the deep blood vessels. In other words, when the red light is reflected by the finger and reaches the fingerprint detection device, or When reaching the pixel unit array of the fingerprint detection device 101, the red light carries the information of the deep blood vessels and the superficial blood vessels at the same time, so the PPG signals of the deep blood vessels and the superficial blood vessels can be simultaneously captured by the red light, for example, the red light-emitting pixels emit light signals.
  • the light signal 106 and the light signal 107 respectively carry the information of the superficial blood vessel and the deep blood vessel, wherein 201 is the deep blood vessel of the finger, such as the transverse palmar artery.
  • Green light or blue light has weak penetrating ability and can only reach superficial blood vessels (not shown in Figure 2), such as epidermal capillaries.
  • the green light or blue light only carries the information of the superficial blood vessels, so only the PPG signal of the superficial blood vessels can be obtained by using the green light or blue light, so the first PPG signal can be passed through.
  • the PPG signal of the deep blood vessel that is, the third PPG signal, is obtained by calculating with the second PPG signal.
  • the third PPG signal may be obtained by making a difference between the first PPG signal and the second PPG signal, that is, the third PPG signal is the first PPG signal and the second PPG signal
  • the difference value of the signals, or the third PPG signal is obtained by normalizing the first PPG signal and the second PPG signal. In this way, blood pressure closer to the real value can be further obtained according to the third PPG signal carrying the deep blood vessel information.
  • the fingerprint detection apparatus 101 further includes a processor (not shown in FIG. 2 ), where the processor is configured to acquire a third PPG signal according to the first PPG signal and the second PPG signal .
  • the processor is configured to obtain the third PPG signal by making a difference between the first PPG signal and the second PPG signal, or the processor is configured to obtain the third PPG signal by comparing the first PPG signal and the second PPG signal.
  • the second PPG signal is normalized to obtain the third PPG signal.
  • the processor is further configured to acquire the blood pressure of the user according to the third PPG signal.
  • PTT Pulse Transit Time
  • PWA Pulse Wave Analysis
  • PWA refers to the fact that information such as the shape, amplitude, time and peak value of the pulse wave waveform has a certain correlation with blood vessel elasticity and blood pressure, so it can also be used for blood pressure detection. However, because these schemes obtain blood pressure in an indirect way, the measurement accuracy is poor.
  • the fingerprint detection device 101 is further configured to obtain the user's blood pressure according to the third PPG signal and the pressing pressure of the user's finger on the display screen 102, so as to improve the accuracy of blood pressure detection.
  • Compression pressure contains information of pressure dimension, which can improve the accuracy of blood pressure detection.
  • the blood pressure of the population is between 40mmHg and 200mmHg, and 200mmHg can be used as the condition for determining the end of the collection.
  • the finger pressure is greater than 200mmHg, the blood flow of the finger is blocked and the PPG signal disappears, so it can also be done according to the amplitude of the PPG signal. determination.
  • the PPG signal amplitude is lower than a certain set value, the PPG signal acquisition is ended.
  • the collection of the first PPG signal or the second PPG signal is ended.
  • the third threshold is 200 mmHg.
  • the amplitude of the first PPG signal/the second PPG signal is smaller than the fourth threshold, the collection of the first PPG signal/the second PPG signal is ended.
  • the fingerprint detection device 102 can be used to obtain the pressing pressure of the user's finger on the display screen 102 according to the pressing area of the user's finger on the display screen 102 and the pressing pressure of the user's finger on the display screen 102 , wherein the pressing area of the user's finger on the display screen 102 Obtained through the fingerprint detection device 101 or the display screen 102 .
  • the electronic device 100 further includes a pressure sensor 104 , and the pressure sensor 104 is disposed below the display screen 102 adjacent to the fingerprint identification device 101 .
  • the pressure sensor 104 is disposed adjacent to the fingerprint identification device 101, so that when the user's finger 200 is pressed on the display screen 102 for blood pressure detection, the pressure sensor 104 can be used to obtain the pressure of the user's finger 200 when the fingerprint detection device 101 obtains the PPG signal.
  • the pressing pressure of the display screen 102 therefore, according to the pressing area and the pressing pressure, the pressing pressure of the user's finger 200 during blood pressure detection can be further obtained.
  • the fingerprint detection device 101 When the fingerprint detection device 101 obtains the PPG signal, it can also obtain the pressing pressure of the user's finger pressing the display screen 102 through the pressure sensor 104, so that after further obtaining the pressing pressure, the pressing pressure and the third pressure can be obtained.
  • the PPG signal obtains a more accurate blood pressure.
  • the fingerprint detection apparatus 101 is further configured to acquire the pressing area of the user's finger 200 on the display screen 102 .
  • the fingerprint detection device 101 is configured to receive the light signal irradiated by the light source to the user's finger and reflected by the user's finger and pass through the display screen 102, so as to obtain the light signal of the user's finger.
  • the pressing area of the finger 200 on the display screen 102 .
  • the light source is the light-emitting pixel 1021 of the display screen 102
  • the light signal emitted by the light-emitting pixel 1021 irradiates the user's finger 200 and is reflected by the surface of the finger.
  • the user's finger presses on the The pressed area on the display screen 102 .
  • the display screen is an OLED display screen, and the light-emitting pixels corresponding to the fingerprint detection area all emit light. This part of the light-emitting pixels may include red, blue and green light-emitting pixels, which can be used as the excitation light source for obtaining the pressing area.
  • the fingerprint detection device forms a fingerprint image after receiving the light signal reflected from the surface of the user's finger. After the fingerprint image is processed, the pressing area of the user's finger 200 on the display screen 102 can be obtained. The optical signal is emitted by the light source.
  • the processor of the fingerprint detection apparatus 101 may be configured to process the fingerprint image to obtain the pressed area.
  • the display screen 102 is used to obtain the pressing area of the user's finger 200 on the display screen 102 .
  • the display screen is a touch-integrated display screen with a touch function.
  • the pressing area of the user's finger 200 on the display screen 102 can be obtained through the touch function.
  • the pressure sensor 104 can measure the time-varying value of the pressing pressure, so the time-varying value of the pressure can be obtained by combining with the pressing area.
  • the processor is further configured to, according to the intensity of the third PPG signal, change the order of the third PPG signals respectively obtained by the plurality of pixel units of the fingerprint detection device from large to Sort by small.
  • the processor is further configured to retain signals whose sequence numbers are less than or equal to a first threshold in the sorted third PPG signal, where the first threshold is the sequence number of the third PPG signal and the sequence number.
  • the third PPG signal whose sequence number is less than or equal to the first threshold among the third PPG signals after the reserved sequence is denoted as the fourth PPG signal.
  • the first threshold may be 30%, 25% or 20%. If the light source does not irradiate the deep blood vessels, the obtained third PPG signal will be weak. In order to further improve the accuracy of blood pressure detection, it is possible to keep all the ones whose order of intensity is smaller than the first threshold.
  • the third PPG signal is reserved, that is, the third PPG signal with higher intensity is retained, so that a more accurate blood pressure value can be obtained through the screened out third PPG signal (ie, the fourth PPG signal) with higher intensity.
  • the 400 third PPG signals are sorted in descending order of intensity. If the first threshold is 30%, then the third PPG signals before the sequence number 120 are reserved.
  • PPG signals that is, the third PPG signals in the order of 1 to 120 are reserved, that is, the first 120 third PPG signals are reserved, and these 120 third PPG signals are recorded as the fourth PPG signals.
  • the product of the number of PPG signals and the first threshold is not an integer, and whether to retain the current third PPG signal may be determined according to rounding. Since the third PPG signal whose arrangement order is at the back is relatively weak, discarding the third PPG signal whose arrangement order is greater than the first threshold not only does not affect the blood pressure measurement, but can instead obtain a more accurate blood pressure value.
  • the processor is configured to obtain the pressing pressure at the peak-to-peak maximum moment of the fourth PPG signal according to the fourth PPG signal and the pressing pressure, and according to the peak-to-peak maximum moment of the fourth PPG signal. Compression pressure to get the user's blood pressure.
  • the processor is configured to sort fourth PPG signals obtained respectively by a plurality of pixel units in the fingerprint detection device according to the pressing pressure to obtain a fourth PPG signal envelope.
  • the processor is configured to sort the fourth PPG signals obtained from the plurality of pixel units from large to small according to the pressing pressure.
  • the processor is further configured to retain the fourth PPG signal whose sequence number is less than or equal to a second threshold in the sorted fourth PPG signal (the fourth PPG signal envelope). is the ratio of the sequence number of the fourth PPG signal to the number of the fourth PPG signal.
  • a signal whose arrangement sequence number is less than or equal to the second threshold in the fourth PPG signal (the fourth PPG signal envelope) after the reserved ordering is recorded as the fifth PPG signal.
  • the second threshold may be 30%, 25% or 20%. The greater the pressure corresponding to the fourth PPG signal envelope peak value, the more deep aortic signals obtained by the pixel unit. Therefore, further screening out the fourth PPG signal less than or equal to the second threshold value can further improve the accuracy of blood pressure detection.
  • the 120 fourth PPG signals are sorted in descending order according to the pressing pressure to obtain the fourth PPG signal envelope, if the second threshold is 30% , then the fourth PPG signal before the sequence number 36 is reserved, that is, the fourth PPG signal with the order of 1 to 36 is reserved, that is, the first 36 fourth PPG signals are reserved, and these 36 fourth PPG signals are recorded as the fifth It can be understood by the PPG that, if the product of the number of the fourth PPG signals and the second threshold is not an integer, whether to retain the current fourth PPG signal may be determined according to rounding.
  • the isolated pixel unit refers to the fourth PPG signal obtained corresponding to the adjacent pixel unit is discarded.
  • the remaining fifth PPG signal is denoted as the sixth PPG signal.
  • the transverse palmar artery is a blood vessel with a band-like distribution and has a certain width
  • the fifth PPG signal retained in the previous step that is, the pixel unit corresponding to the sixth PPG signal
  • the pixel unit corresponding to the retained sixth PPG signal is consistent with the direction of the transverse palmar artery, that is, the PPG signal and its envelope of the transverse palmar artery are obtained, and the blood pressure is calculated by using the PPG signal obtained by this part of the pixel unit. Closer to the blood pressure of the large arteries in the body.
  • the average arterial pressure of the user can be obtained, and then the blood pressure value can be calculated according to the coefficient method or the double Gaussian fitting method, and the method for calculating the blood pressure value
  • the embodiment is not limited, as long as the user's blood pressure can be calculated.
  • the mean arterial pressure may be the pressure corresponding to the envelope peak value of the sixth PPG signal.
  • FIG. 4 is a schematic diagram of a finger 200.
  • the finger 200 includes a transverse palmar arch artery 201, and FIG. 2 can be referred to together.
  • the blood pressure value of the transverse palmar arch artery of the finger is closer to the blood pressure value of the large artery in the body than other tiny arteries.
  • the thickness of the transverse palmar arch artery is 0.85 ⁇ 0.1mm, and the length is close to the width of the finger.
  • the fingerprint detection device 101 determines whether the pressed area of the finger includes the center of the fingerprint.
  • the processor of the fingerprint detection device 101 can determine whether the fingerprint image includes the center of the fingerprint.
  • the tangent method can be used to confirm whether the current fingerprint image contains the center of the fingerprint. Specifically, two non-parallel fingerprint lines can be arbitrarily found on the fingerprint image, and tangent lines are made to the two fingerprint lines respectively. The center of the fingerprint, if the focus of the two normals is outside the fingerprint image, then the pressed area representing the finger does not include the center of the fingerprint.
  • the blood pressure detection is terminated, and the user may be prompted to press again until it is determined that the pressing area of the finger contains the center of the fingerprint.
  • the blood pressure detection is continued.
  • the first light source and the second light source are illuminated, and then the fingerprint detection apparatus 101 acquires the first PPG signal and the second PPG signal.
  • the width direction is the direction along the length of the finger
  • the long direction is the direction of the width of the finger. Referring to the rectangle 202 shown in FIG.
  • the transverse palmar arch artery considering that the position of the transverse palmar arch artery in different populations is discrete within the range of ⁇ 1mm from the center of the fingerprint, optional, R is less than or equal to 3mm, S is greater than or equal to the width of the finger, for example, S is greater than or equal to 8mm , which not only ensures that the light-emitting pixels can be irradiated to the area where the transverse palmar artery is located, but also reduces the power consumption when the electronic device performs blood pressure detection.
  • the blood pressure detection may be completed by the processor, for example, the processor may perform various signal processing for blood pressure detection.
  • An embodiment of the present application further provides an electronic device, including a display screen and a fingerprint detection device, wherein the fingerprint detection device is arranged below the display screen and is used for blood pressure detection.
  • the fingerprint detection device may be arranged below the fingerprint detection area of the display screen, and is used to acquire fingerprint information of a finger or information of a user's blood pressure.
  • the electronic device further includes a pressure sensor, and the pressure sensor is disposed below the display screen adjacent to the fingerprint identification device.
  • the pressure sensor is arranged adjacent to the fingerprint identification device, so that when the user's finger is pressed on the display screen for blood pressure detection, when the fingerprint detection device obtains the PPG signal, the pressure sensor can be used to obtain the pressure of the user's finger pressing the display screen. Get more accurate blood pressure.
  • the electronic device may be a mobile electronic device such as a mobile phone and a tablet computer.
  • the electronic device may further include a light source.
  • a light source for the related content of the electronic device, please refer to the related content of FIG. 1 and FIG. 2 , which will not be repeated here.
  • FIG. 5 shows a blood pressure detection method according to an embodiment of the present application.
  • the blood pressure detection method includes: S501.
  • the fingerprint detection device receives the first light signal reflected by the user's finger and passing through the display screen, the The first optical signal is an optical signal of a first wavelength emitted by a first light source, and the first optical signal is used to obtain a first PPG signal;
  • the fingerprint detection device receives a second optical signal reflected by the user's finger and passing through the display screen, where the second optical signal is an optical signal of a second wavelength emitted by the second light source, the second optical signal is used to obtain a second PPG signal;
  • the blood pressure detection method of the embodiment of the present application is applicable to the fingerprint detection device shown in FIG. 1 and FIG. 2 , or an electronic device.
  • the fingerprint detection device not only has a detection function, but also is used for blood pressure detection, so there is no need to additionally set the blood pressure.
  • the detection device can greatly reduce the cost of electronic equipment.
  • the fingerprint detection device may be arranged below the fingerprint detection area of the display screen, and is used to obtain fingerprint information of a finger or information of a user's blood pressure.
  • the blood pressure detection method provided by the present application adopts the fingerprint detection device under the screen to obtain the PPG signal, and further obtains the blood pressure of the user. Since the electronic equipment equipped with the fingerprint detection device under the screen is small in size and easy to carry, it is convenient for the user to perform all-weather blood pressure detection. .
  • at least two light sources with different wavelengths are used to obtain PPG signals of different wavelengths, and PPG signals that are closer to the deep blood vessels are further obtained through the PPG signals of at least two different wavelengths, so that the finally obtained blood pressure is closer to the true value.
  • the display screen in the embodiment of the present application may be a self-luminous display screen, such as an OLED display screen, and the first light source and the second light source may be light-emitting pixels of the display screen.
  • the light-emitting pixels of the display screen may be directly used as blood pressure detection or The excitation light source for fingerprint detection does not require additional light sources, which can reduce the cost.
  • the light-emitting pixels of the display screen as the excitation light source, the light emission is more uniform, and a more accurate blood pressure value can be obtained or the fingerprint detection result can be more accurate.
  • the light-emitting pixels of the OLED display screen include red, blue and green light-emitting pixels, which can be used as excitation light sources for blood pressure detection or fingerprint detection.
  • different light sources can be illuminated in time-sharing.
  • light sources with different wavelengths can be used to emit light at the first moment and the second moment, and the fingerprint detection device receives the corresponding light at the first moment and the second moment.
  • the light signal emitted by the light source of different wavelengths is used for time-sharing, which can further obtain the PPG signal that is closer to the deep blood vessels, so that the final blood pressure is closer to the true value.
  • a certain color or a certain wavelength of light source can be used for lighting, or multiple colors or multiple wavelengths of light source can be used for lighting at the same time, because fingerprint detection mainly detects the user's finger.
  • the valley ridge pattern information does not need to obtain the information of the deep blood vessels, only a certain color is used for lighting, or the light source of multiple colors is used for lighting at the same time, which can further improve the efficiency of fingerprint detection and improve the user experience. It can be understood that, when the fingerprint detection device is applied to an electronic device with a non-self-luminous display screen, an additional light source may be provided, and the light source may be arranged below the display screen or side by side with the display screen. limit. It can be understood that light sources with different colors have different luminous wavelengths.
  • the first light source is a red light source
  • the second light source is a blue light source or a green light source. Due to the strong penetrating ability of red light, it can reach deep blood vessels. In other words, when the red light is reflected by the finger and reaches the fingerprint detection device, or reaches the pixel unit array of the fingerprint detection device, the red light simultaneously carries deep blood vessels and deep blood vessels. The information of the superficial blood vessels can be used to capture the PPG signals of the deep blood vessels and the superficial blood vessels at the same time. Green light or blue light has weak penetrating ability and can only reach superficial blood vessels, such as epidermal capillaries.
  • the "obtaining a third PPG signal according to the first PPG signal and the second PPG signal" in S503 includes: obtaining the third PPG signal by making a difference between the first PPG signal and the second PPG signal ; or normalize the first PPG signal and the second PPG signal to obtain the third PPG signal.
  • the blood pressure detection method further includes:
  • S504 Acquire the pressing pressure of the user's finger pressing the display screen, and obtain the user's blood pressure according to the third PPG signal and the pressing pressure.
  • Compression pressure contains information of pressure dimension, which can improve the accuracy of blood pressure detection.
  • the blood pressure of the population is between 40mmHg and 200mmHg, and 200mmHg can be used as the condition for determining the end of the collection.
  • the finger pressure is greater than 200mmHg, the blood flow of the finger is blocked and the PPG signal disappears, so it can also be done according to the amplitude of the PPG signal. determination.
  • the PPG signal amplitude is lower than a certain set value, the PPG signal acquisition is ended.
  • the collection of the first PPG signal or the second PPG signal is ended.
  • the third threshold is 200 mmHg.
  • the amplitude of the first PPG signal/the second PPG signal is smaller than the fourth threshold, the collection of the first PPG signal/the second PPG signal is ended.
  • the "obtaining the pressing pressure of the user's finger pressing the display screen” includes:
  • S5041 Acquire the pressing pressure of the user's finger on the display screen according to the pressing area of the user's finger on the display screen and the pressing pressure of the user's finger on the display screen, wherein the pressing area of the user's finger on the display screen passes through Obtained by the fingerprint detection device or the display screen.
  • the pressing pressure of the user's finger on the display screen may be acquired through a pressure sensor, and the pressure sensor may be disposed below the display screen adjacent to the fingerprint detection device.
  • the fingerprint detection device acquires the PPG signal, it can also acquire the pressing pressure of the user's finger pressing the display screen through the pressure sensor.
  • the pressure and the third PPG signal obtain a more accurate blood pressure.
  • the pressing area of the user's finger on the display screen may be acquired by the fingerprint detection device.
  • the fingerprint detection device is configured to receive the light signal irradiated by the light source to the user's finger and reflected by the user's finger and pass through the display screen, thereby enabling Obtain the pressing area of the user's finger on the display screen.
  • the light source is a light-emitting pixel of the display screen
  • the user's finger is pressed on the display screen. The pressing area on the screen.
  • the display screen is an OLED display screen, and the light-emitting pixels corresponding to the fingerprint detection area all emit light.
  • This part of the light-emitting pixels may include red, blue and green light-emitting pixels, which can be used as the excitation light source for obtaining the pressing area.
  • the fingerprint detection device forms a fingerprint image after receiving the light signal reflected from the surface of the user's finger, and after the fingerprint image is processed, the pressing area of the user's finger on the display screen can be obtained.
  • the optical signal is emitted by the light source.
  • the processor of the fingerprint detection apparatus may be configured to process the fingerprint image to obtain the pressing area.
  • the blood pressure value of the transverse palmar arch artery of the finger is closer to the blood pressure value of the large artery in the body than other tiny arteries.
  • the thickness of the transverse palmar arch artery is 0.85 ⁇ 0.1mm, and the length is close to the width of the finger. Because the transverse palmar arch artery is located in the finger. Near the center of the fingerprint, in order to obtain a more accurate blood pressure value, in the blood pressure detection method, "the pressing area of the user's finger on the display screen is obtained through the fingerprint detection device or the display screen" including:
  • the fingerprint detection device forms a fingerprint image according to the received light signal reflected from the surface of the user's finger;
  • the blood pressure detection is ended
  • the blood pressure detection is continued.
  • the user may be prompted to press again until it is determined that the pressing area of the user's finger contains the center of the fingerprint.
  • the finger pressing position is shifted, such as fingertip pressing or edge finger pressing, the fingerprint image obtained at this time does not include the center of the fingerprint, and such pressing position does not include the transverse palmar artery of the finger, so the blood pressure is measured. Accurate blood pressure values cannot be obtained during testing.
  • Determining whether the pressed area of the user's finger includes the center of the fingerprint according to the fingerprint image includes: using the tangent method to determine whether the pressed area of the user's finger includes the center of the fingerprint. Specifically, two non-parallel fingerprint lines can be arbitrarily found on the fingerprint image, and tangent lines are made to the two fingerprint lines respectively. If the focus of the two normal lines is located in the fingerprint image, it represents the pressing area of the user's finger. Including the center of the fingerprint, if the focus of the two normals is outside the fingerprint image, then the pressing area representing the finger does not include the center of the fingerprint.
  • the blood pressure detection is continued.
  • the first light source and the second light source are illuminated, and then the fingerprint detection device acquires the first PPG signal and the second PPG signal.
  • the width direction is the direction along the length of the finger
  • the long direction is the direction of the width of the finger. Referring to the rectangle 202 shown in FIG.
  • the transverse palmar arch artery considering that the position of the transverse palmar arch artery in different populations is discrete within the range of ⁇ 1mm from the center of the fingerprint, optional, R is less than or equal to 3mm, S is greater than or equal to the width of the finger, for example, S is greater than or equal to 8mm , which not only ensures that the light-emitting pixel can be irradiated to the area where the transverse palmar artery is located, but also reduces the power consumption during blood pressure detection.
  • the display screen is used to obtain the pressing area of the user's finger on the display screen.
  • the display screen is a touch-integrated display screen with a touch function.
  • the pressing area of the user's finger on the display screen can be obtained through the touch function.
  • it is not necessary to use a fingerprint detection device to form a fingerprint image to obtain the pressing area which can reduce the process and improve the efficiency of blood pressure detection.
  • the pressure sensor can measure the time-varying value of the pressing pressure, so the time-varying value of the pressure can be obtained by combining with the pressing area.
  • the "obtaining the user's blood pressure according to the third PPG signal and the compression pressure.” includes:
  • S5042 Sort the third PPG signals obtained by the plurality of pixel units in the fingerprint detection device from large to small according to the strength of the third PPG signal, and retain the sorted third PPG signals
  • the signal whose sequence number is less than or equal to a first threshold, the first threshold is the ratio of the sequence number of the third PPG signal to the number of the third PPG signal, wherein the sequence number of the third PPG signal is less than or equal to the first threshold.
  • the third PPG signal is the fourth PPG signal.
  • the first threshold may be 30%, 25% or 20%. If the light source does not irradiate the deep blood vessels, the obtained third PPG signal will be weak. In order to further improve the accuracy of blood pressure detection, it is possible to keep all the ones whose order of intensity is smaller than the first threshold.
  • the third PPG signal is reserved, that is, the third PPG signal with higher intensity is retained, so that a more accurate blood pressure value can be obtained through the screened out third PPG signal (ie, the fourth PPG signal) with higher intensity. Since the third PPG signal whose arrangement order is at the back is relatively weak, discarding the third PPG signal whose arrangement order is greater than the first threshold not only does not affect the blood pressure measurement, but can instead obtain a more accurate blood pressure value.
  • the examples listed in the foregoing content which will not be described in detail here.
  • S504 further includes:
  • S5043 Acquire the pressing pressure at the peak-to-peak maximum moment of the fourth PPG signal according to the fourth PPG signal and the pressing pressure.
  • the user's blood pressure can be obtained according to the compression pressure at the peak-to-peak maximum moment of the fourth PPG signal.
  • S504 may further include:
  • S5044 Sort the fourth PPG signals obtained by the plurality of pixel units in the fingerprint detection device from large to small according to the pressing pressure to obtain a fourth PPG signal envelope, and retain the fourth PPG signal package A signal whose sequence number is less than or equal to a second threshold in the network, where the second threshold is the ratio of the sequence number of the fourth PPG signal to the number of the fourth PPG signal, where the sequence number is less than or equal to the second threshold.
  • the fourth PPG signal is a fifth PPG signal.
  • the second threshold may be 30%, 25% or 20%.
  • the isolated pixel unit means that the fourth PPG signal acquired by the adjacent pixel unit is discarded.
  • S504 further includes:
  • S5035 Discard the fifth PPG signal corresponding to the isolated pixel unit in the fingerprint detection device, and the isolated pixel unit refers to the fourth PPG signal obtained by the adjacent pixel unit is discarded, wherein, The fifth PPG signal remaining after the fifth PPG signal obtained corresponding to the isolated pixel unit is discarded is the sixth PPG signal.
  • the transverse palmar artery is a blood vessel with a band-like distribution and has a certain width
  • the fifth PPG signal retained in this step that is, the pixel unit corresponding to the sixth PPG signal
  • S5036 Acquire the blood pressure of the user according to the sixth PPG signal and the compression pressure.
  • the user's mean arterial pressure can be obtained according to the sixth PPG signal envelope formed by the sixth PPG signal, and then the user's blood pressure can be obtained according to the mean arterial pressure.
  • the blood pressure can be calculated according to the coefficient method or the double Gaussian fitting method. value, the method for calculating the blood pressure value is not limited in the embodiment of the present application, as long as the user's blood pressure can be calculated.
  • the mean arterial pressure may be the pressure corresponding to the envelope peak value of the sixth PPG signal.
  • the processing unit or the processor in this embodiment of the present application may be an integrated circuit chip, which has a signal processing capability.
  • each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software.
  • the above-mentioned processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other available Programming logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC Application Specific Integrated Circuit
  • FPGA off-the-shelf programmable gate array
  • the methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed.
  • the blood pressure detection device of the embodiment of the present application may further include a storage unit or a memory, and the memory may be a volatile memory or a
  • the disclosed system, apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium.
  • the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that make contributions to the prior art or the parts of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

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Abstract

提供一种指纹检测装置、电子设备以及血压检测方法，能够方便用户进行全天候的血压监测。该指纹检测装置，适用于具有显示屏的电子设备并设置在显示屏的下方，用于进行血压检测，电子设备包括第一光源和第二光源，指纹检测装置用于在第一时刻接收被用户手指反射回来并穿过显示屏的第一光信号，第一光信号为第一光源发出的第一波长的光信号; 指纹检测装置用于在第二时刻接收被用户手指反射回来并穿过显示屏的第二光信号，第二光信号为第二光源发出的第二波长的光信号; 第一波长与第二波长不同，第一光信号用于获取第一PPG信号，所述第二光信号用于获取第二PPG信号，第一PPG信号和第二PPG信号用于获取第三PPG信号，第三PPG信号用于获取用户的血压。

Description

指纹检测装置、电子设备以及血压检测方法 技术领域
本申请涉及电子技术领域，并且更为具体地，涉及一种血压检测方法、装置以及电子设备。
背景技术
随着当前生活水平的不断提高，高血压人群占比迅速增多。目前，市面上成熟的血压检测方法是基于听诊法或者示波法的有袖带式检测方法，其中，听诊法需要较为专业的操作人员基于肱动脉血液流动的声音判断血压，适用于医用场景；示波法是先将袖带充气以阻断动脉血流，然后在排气的过程中检测袖带内的气体压力并提取微弱的脉搏波，并根据脉搏波随袖带内压力的变化检测得到血压值。对于高血压患者而言，血压测量的准确性以及血压计便携性是十分重要的，虽然采用有袖带式检测方法的血压计血压测量较为准确，但体积较大不方便携带，无法进行全天候的血压监测而无法满足高血压患者的需求。因此，如何能够方便用户进行全天候的血压监测成为亟待解决的问题。
发明内容
本申请实施例提供一种指纹检测装置、电子设备以及血压检测方法，能够方便用户进行全天候的血压监测。
第一方面，提供一种指纹检测装置，适用于具有显示屏的电子设备，所述指纹检测装置设置在所述显示屏的下方，用于进行血压检测，所述电子设备包括光源，所述光源包括第一光源和第二光源，其中，所述指纹检测装置用于在第一时刻接收被用户手指反射回来并穿过所述显示屏的第一光信号，所述第一光信号为所述第一光源发出的第一波长的光信号；所述指纹检测装置用于在第二时刻接收被用户手指反射回来并穿过所述显示屏的第二光信号，所述第二光信号为所述第二光源发出的第二波长的光信号；其中，所述第一波长与所述第二波长不同，所述第一光信号用于获取第一PPG信号，所述第二光信号用于获取第二PPG信号，所述第一PPG信号和所述第二PPG 信号用于获取第三PPG信号，所述第三PPG信号用于获取用户的血压。
第二方面，提供一种电子设备，包括显示屏、如第一方面所述的指纹检测装置，其中所述指纹检测装置设置在所述显示屏的下方，用于进行血压检测。
第三方面，提供一种血压检测方法，包括：
在第一时刻，指纹检测装置接收被用户手指反射回来并穿过显示屏的第一光信号，所述第一光信号为第一光源发出的第一波长的光信号，所述第一光信号用于获取第一PPG信号；在第二时刻，指纹检测装置接收被用户手指反射回来并穿过所述显示屏的第二光信号，所述第二光信号为所述第二光源发出的第二波长的光信号，所述第二光信号用于获取第二PPG信号；根据所述第一PPG信号和所述第二PPG信号获取第三PPG信号，其中，所述第三PPG信号用于获取用户的血压，所述第一波长与所述第二波长不同。
本申请提供的实施例中，采用屏下指纹检测装置获取PPG信号，进一步来获取用户的血压，由于搭载屏下指纹检测装置的电子设备体积较小便于携带，因而能够方便用户进行全天候的血压检测。此外，本申请中利用至少两种不同波长的光源来获得不同波长的PPG信号，通过至少两个不同波长的PPG信号进一步得到更接近深层血管的PPG信号，使得最终得到的血压更接近真实值。并且指纹检测装置除了具有指纹检测功能的同时，还用来进行血压检测，因而不用额外再设置血压检测的装置，能够大幅降低电子设备的成本。
附图说明
图1为本申请实施例提供的指纹检测装置适用的一种电子设备的结构示意图。
图2为本申请实施提供的指纹检测装置适用的一种电子设备的剖片示意图。
图3为手指掌横弓动脉的示意图。
图4为根据指纹图像获取手指按压显示屏的按压区域是否包含指纹中心的切线法的示意图。
图5为本申请实施例提供的一种血压检测方法的示意性流程框图。
图6为本申请实施例提供的另一血压检测方法的示意性流程框图。
图7为本申请实施例提供的另一血压检测方法的示意性流程框图。
图8为本申请实施例提供的另一血压检测方法的示意性流程框图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
应理解，本文中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围。
还应理解，在本申请的各种实施例中，各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
还应理解，本说明书中描述的各种实施方式，既可以单独实施，也可以组合实施，本申请实施例对此并不限定。
除非另有说明，本申请实施例所使用的所有技术和科学术语与本申请的技术领域的技术人员通常理解的含义相同。本申请中所使用的术语只是为了描述具体的实施例的目的，不是旨在限制本申请的范围。本申请所使用的术语“和/或”包括一个或多个相关的所列项的任意的和所有的组合。
为了满足用户需求，能够方便用户进行全天候的血压检测，以随时监测身体健康状况，本申请提供了一种指纹检测装置，适用于具有显示屏的电子设备，所述指纹检测装置设置在所述显示屏的下方，用于进行血压检测，所述电子设备包括光源，所述光源包括第一光源和第二光源，其中，所述指纹检测装置用于在第一时刻接收被用户手指反射回来并穿过所述显示屏的第一光信号，所述第一光信号为所述第一光源发出的第一波长的光信号；
所述指纹检测装置用于在第二时刻接收被用户手指反射回来并穿过所述显示屏的第二光信号，所述第二光信号为所述第二光源发出的第二波长的光信号；
其中，所述第一波长与所述第二波长不同，所述第一光信号用于获取第一PPG信号，所述第二光信号用于获取第二PPG信号，所述第一PPG信号和所述第二PPG信号用于获取第三PPG信号，所述第三PPG信号用于获取用户的血压。
本申请提供的实施例中，采用屏下指纹检测装置获取光电容积描记(Photoplethysmography，PPG)信号，进一步来获取用户的血压，由于搭载屏下指纹检测装置的电子设备体积较小便于携带，因而能够方便用户进行全天候的血压检测。此外，本申请中利用至少两种不同波长的光源来获得不同波长的PPG信号，通过至少两个不同波长的PPG信号进一步得到更接近深层血管的PPG信号，使得最终得到的血压更接近真实值。并且指纹检测装置除了具有指纹检测功能的同时，还用来进行血压检测，因而不用额外再设置血压检测的装置，能够大幅降低电子设备的成本。
图1为本申请实施例的指纹检测装置适用的一种电子设备的示意图，图2为图1所示的电子设备的切面图。电子设备100包括指纹检测装置101和显示屏102，指纹检测装置101设置在显示屏102的下方，用于进行血压检测。具体的，指纹检测装置101可以设置在显示屏102的指纹检测区域(图1中未示出)的下方，用于获取手指的指纹信息或者用户的血压信息。可选的，电子设备100还可以包括103保护盖板，保护盖板103设置在显示屏102的上方，以保护显示屏，具体的，保护盖板103可以为玻璃盖板或者蓝宝石盖板等等。
指纹检测装置101包括像素单元阵列(图1中未示出)，所述像素单元阵列包括多个像素单元，所述像素单元用于接收光信号，并将其转化为对应的电信号，例如PPG信号、指纹图像的像素。
电子设备100包括光源，所述光源可以为显示屏102的发光像素1021，显示屏102为自发光显示屏，例如OLED显示屏。此时，可以直接利用显示屏的发光像素作为血压检测或者指纹检测的激励光源，无需额外增加光源，能够降低成本，此外，利用显示屏的发光像素作为激励光源，发光更加均匀，能够获得更加准确的血压值或使得指纹检测结果更加准确。OLED显示屏的发光像素包括红色、蓝色和绿色的发光像素，能够作为血压检测或者指纹检测的激励光源。在进行血压检测时，可以将不同光源进行分时打光，如前面所述，可以在第一时刻和第二时刻采用不同波长的光源发光，指纹检测装置101在第一时刻和第二时刻接收相应的光源发出的光信号，采用不同波长的光源分时打光，能够进一步获得更接近深层血管的PPG信号，使得最终得到的血压更接近真实值。在进行指纹检测时，可以只采用某一种颜色或某一 种波长的光源进行打光，也可以采用多种颜色或多种波长的光源同时打光，由于指纹检测主要检测的是用户手指的谷脊纹路信息，无需获取深层血管的信息，只采用某一种颜色进行打光，或者采用多种颜色的光源同时进行打光，能够进一步提升指纹检测的效率，提升用户体验。可以理解的是，当指纹检测装置应用于具有非自发光显示屏的电子设备中时，可以额外设置光源，并将光源设置在显示屏的下方或者与显示屏并排设置，本申请实施例不做限制。可以理解的是，颜色不同的光源，其发光的波长也不相同。
可选的，所述第一光源为红光光源，所述第二光源为蓝光光源或者绿光光源。参考图2，假设红光光源为显示屏102中的红色发光像素，由于红光的穿透能力强，能够到达深层血管，换句话说，当红光被手指反射回来并到达指纹检测装置，或者说到达指纹检测装置101的像素单元阵列时，红光同时携带了深层血管和浅层血管的信息，因而能利用红光同时捕获到深层血管和浅层血管的PPG信号，例如红色发光像素发出光信号105并被手指200反射回来后，光信号106和光信号107分别携带了浅层血管和深层血管的信息，其中201为手指的深层血管，例如掌横弓动脉。绿光或者蓝光穿透能力弱，只能到达浅层血管(图2中未示出)，例如表皮毛细血管，换句话说，当绿光或者蓝光被手指反射回来并到达指纹检测装置，或者说到达指纹检测装置101的像素单元阵列时，绿光或者蓝光仅携带了浅层血管的信息，因而利用绿光或者蓝光仅能获取到浅层血管的PPG信号，因此能够通过所述第一PPG信号和所述第二PPG信号计算获取到深层血管的PPG信号，即所述第三PPG信号。
可选的，可以通过对所述第一PPG信号和所述第二PPG信号做差获取所述第三PPG信号，即所述第三PPG信号为所述第一PPG信号和所述第二PPG信号的差值，或者通过对所述第一PPG信号和所述第二PPG信号进行归一化获取所述第三PPG信号。由此根据携带深层血管信息的第三PPG信号进一步能够获取更接近真实值的血压。
作为一种可选的实施例，指纹检测装置101还包括处理器(图2中未示出)，所述处理器用于根据所述第一PPG信号和所述第二PPG信号获取第三PPG信号。具体的，所述处理器用于通过对所述第一PPG信号和所述第二PPG信号做差获取所述第三PPG信号，或者所述处理器用于通过对所述第 一PPG信号和所述第二PPG信号进行归一化获取所述第三PPG信号。
进一步的，所述处理器还用于根据所述第三PPG信号获取用户的血压。
为了在可穿戴设备上应用，提高高血压患者日常血压测试的频率，市面上出现了基于脉搏传导时间(Pulse Transit Time，PTT)，脉搏波分析(Pulse Wave Analysis，PWA)方法制作的智能手表，通过智能手表上的心电图(Electrocardiograph，ECG)和PPG信号，计算脉搏波传输速度，或者分析脉搏波波形，来间接获取血压。PTT指的是心脏泵血时，动脉脉搏波从主动脉瓣到达周围血管所用的时间，该时间与血压有正相关关系，因而可用于血压检测。PWA指的是脉搏波波形的形状、幅度、重搏点的时间与峰值等信息与血管弹性和血压呈现一定的相关关系，因而也可用于血压检测。但由于这些方案都是通过间接的方式获取血压，所以测量精度较差。
本申请提供的实施例中，指纹检测装置101还用于根据所述第三PPG信号和用户手指在显示屏102的按压压强获取用户的血压，来提高血压检测的准确性。
按压压强包含了压力维度的信息能够提升血压检测的准确性。人群血压统计在40mmHg～200mmHg，可以利用200mmHg作为判定采集结束的条件，另外，由于手指按压压强大于200mmHg的时候，手指血流被阻断，PPG信号消失，故也可以根据PPG信号幅值来做判定。当PPG信号幅值低于某一设定值的时候，结束PPG信号采集。
作为一种可选的实施例，当按压压强大于等于第三阈值时，结束所述第一PPG信号或者所述第二PPG信号的采集。所述第三阈值为200mmHg。或者所述第一PPG信号/第二PPG信号的幅值小于第四阈值的时候，结束所述第一PPG信号/所述第二PPG信号的采集。
指纹检测装102可以用于根据用户手指在显示屏102的按压面积，以及用户手指在显示屏102的按压压力获取用户手指在显示屏102的按压压强，其中，用户手指在显示屏102的按压面积通过指纹检测装置101或者显示屏102获取。
作为一种可选的实施例，参见图1和图2，电子设备100还包括压力传感器104，压力传感器104与指纹识别装置101相邻设置在显示屏102的下方。压力传感器104与指纹识别装置101相邻设置，能够使得用户手指200 按压在显示屏102进行血压检测时，使得指纹检测装置101在获取PPG信号的时候，压力传感器104能用于获取用户手指200按压显示屏102的按压压力，因而根据按压面积和按压压力进一步可以得到用户手指200在进行血压检测时的按压压强。使得指纹检测装置101在获取PPG信号的时候，还能通过压力传感器104获取到用户手指按压显示屏102的按压压力，因而在进一步获取所述按压压强后能通过所述按压压强和所述第三PPG信号获取到更加准确的血压。
作为一种可选的实施例，指纹检测装置101还用于获取用户手指200在显示屏102的按压面积。当用户手指200按压在显示屏102的指纹检测区域的上方，指纹检测装置101用于接收所述光源照射到用户手指，并被用户手指反射后穿过显示屏102的光信号，进而能够获取用户手指200在显示屏102的按压面积。当所述光源为所述显示屏102的发光像素1021时，发光像素1021发出的光信号照射到用户手指200并被手指的表面反射后，被指纹检测装置101接收到后，得到用户手指按压在显示屏102上的按压面积。例如显示屏为OLED显示屏，所述指纹检测区域对应的发光像素均发光，这部分发光像素可以包括红色、蓝色和绿色的发光像素，能够作为获取所述按压面积的激励光源。
作为一种具体的实施例，所述指纹检测装置接收到用户手指表面反射的光信号后形成指纹图像，所述指纹图像经过处理后可以得到用户手指200按压在显示屏102上的按压面积，所述光信号由所述光源发出。具体的，指纹检测装置101的处理器可以用于处理所述指纹图像进而获取所述按压面积。
作为另一种可选的实施例，显示屏102用于获取用户手指200在显示屏102的按压面积。例如显示屏为具有触控功能的触控一体显示屏，此时，可以通过触控功能来获取用户手指200在显示屏102的按压面积。这种情况下不需要利用指纹检测装置101来形成指纹图像进而获取所述按压面积，能够减少流程提高血压检测的效率。
可以理解的是，压力传感器104能够测出按压压力随时间变化的值，因而通过结合按压面积能够获取压强随时间变化的值。
为了得到更准确的用户的血压，可选的，所述处理器还用于根据所述第三PPG信号的强度对所述指纹检测装置的多个像素单元分别获取的第三 PPG信号由大至小进行排序。
可选的，所述处理器还用于保留排序后的所述第三PPG信号中排列序号小于等于第一阈值的信号，其中，所述第一阈值为所述第三PPG信号的排列序号与所述第三PPG信号数量的比值。为了便于描述，这里将保留排序后的所述第三PPG信号中排列序号小于等于第一阈值的第三PPG信号记为第四PPG信号。例如，所述第一阈值可以为30％，25％或者20％。如果光源未照射到深层血管，那么得到的所述第三PPG信号就会比较微弱，为了进一步提升血压检测的准确性，可以保留依据强度由大到小排序后的排列顺序小于第一阈值的所述第三PPG信号，即保留强度较大的第三PPG信号，这样通过筛选出来的强度较大的第三PPG信号(即第四PPG信号)能够得到更加准确的血压值。举例来说，如果当前有400个第三PPG信号，那么将这400个第三PPG信号依据强度由大到小进行排序，如果第一阈值为30％，那么就保留排列序号120之前的第三PPG信号，也就是保留排列顺序为1至120的第三PPG信号，即保留前120个第三PPG信号，这120个第三PPG信号记为第四PPG信号，可以理解的是，如果第三PPG信号的数量与第一阈值的乘积不是整数，可以依据四舍五入的方式决定是否保留当前的第三PPG信号。由于排列顺序位于后面的第三PPG信号的比较微弱，因此将排列顺序大于所述第一阈值的第三PPG信号丢弃，不仅不会影响血压的测量，反而能够得到更加准确的血压值。
可选的，所述处理器用于根据所述第四PPG信号和所述按压压强获取所述第四PPG信号的峰峰值最大时刻的按压压强，根据所述第四PPG信号的峰峰值最大时刻的按压压强即可获得用户的血压。
可选的，所述处理器用于根据所述按压压强将所述指纹检测装中的多个像素单元分别获取的第四PPG信号进行排序，得到第四PPG信号包络。例如，所述处理器用于根据所述按压压强将所述多个像素单元分别获取的第四PPG信号由大至小进行排序。
可选的，所述处理器还用于保留排序后的所述第四PPG信号(第四PPG信号包络)中排列序号小于等于第二阈值的所述第四PPG信号，所述第二阈值为所述第四PPG信号的排列序号与所述第四PPG信号数量的比值。为了便于描述，这里将保留排序后的所述第四PPG信号(第四PPG信号包络) 中排列序号小于等于第二阈值的信号记为第五PPG信号。例如，所述第二阈值可以为30％，25％或者20％。所述第四PPG信号包络峰值对应的压强越大，代表该像素单元获取到的深层大动脉信号越多。因此，进一步筛选出小于等于所述第二阈值的第四PPG信号能够进一步提高血压检测的准确性。举例来说，如果当前有120个第四PPG信号，那么将这120个第四PPG信号依据按压压强由大到小进行排序，得到所述第四PPG信号包络，如果第二阈值为30％，那么就保留排列序号36之前的第四PPG信号，也就是保留排列顺序为1至36的第四PPG信号，即保留前36个第四PPG信号，这36个第四PPG信号记为第五PPG可以理解的是，如果第四PPG信号的数量与第二阈值的乘积不是整数，可以依据四舍五入的方式决定是否保留当前的第四PPG信号。由于排列顺序位于前面的第四PPG信号携带的信息更加接近体内的大动脉，因此将排列顺序大于所述第二阈值的第四PPG信号丢弃，不仅不会影响血压的测量，反而能够得到更加准确的血压值。
此外，若位置偏离较大的孤立像素单元，可能是信号干扰，比如交感神经的活动，可以直接丢弃，因此还可以丢弃或者剔除所述指纹检测装置中孤立的像素单元对应获取的所述第五PPG信号，所述孤立的像素单元指与之相邻的像素单元对应获取的第四PPG信号被丢弃。为了便于描述，丢弃或者剔除孤立的像素单元对应的第五PPG信号后，将剩余的第五PPG信号记为第六PPG信号。因为掌横弓动脉是带状分布的血管，且具有一定的宽度，在上一步保留的第五PPG信号，也就是第六PPG信号对应的像素单元理应是带状分布的。至此，保留下来的第六PPG信号对应的像素单元与掌横弓动脉走向一致，即获得了掌横弓动脉的PPG信号及其包络，用这部分的像素单元获得的PPG信号进行血压计算，更接近体内大动脉的血压。根据保留下来的第六PPG信号形成的第六PPG信号包络进一步分析，可以得到用户的平均动脉压，接着根据系数法或者双高斯拟合法即可计算出血压值，计算血压值的方法本申请实施例不限定，只要能够计算得到用户的血压即可。其中，平均动脉压可以为第六PPG信号包络峰值对应的压强。
图4为手指200的示意图，手指200中包括掌横弓动脉201，可以一并参见图2。手指的掌横弓动脉的血压值相比于其他的微小动脉更接近于体内大动脉的血压值，掌横弓动脉的粗细为0.85±0.1mm，长度接近手指宽度， 由于掌横弓动脉位于手指的指纹中心位置附近，为了获取更加准确的血压值，指纹检测装置101在获取所述指纹图像后，判断手指的按压区域是否包含指纹中心，若手指按压位置偏移，例如指尖按压或者边手指缘按压，此时获取的指纹图像不包括指纹中心，这样的按压位置并不包括手指的掌横弓动脉，因而进行血压检测时不能获取准确的血压值。具体的，可以通过指纹检测装置101的处理器来判断所述指纹图像是否包含指纹中心。参见图4，可以采用切线法确认当前指纹图像是否包含指纹中心。具体的，可以在指纹图像上任意找两条非平行的指纹纹路，并对这两条指纹纹路分别做切线，若两条法线的焦点位于所述指纹图像内，那么代表手指的按压区域包含指纹中心，若两条法线的焦点位于所述指纹图像外，那么代表手指的按压区域不包含指纹中心。
作为一种可选的实施例，若判断手指的按压区域没有包含指纹中心，则结束血压检测，可以提示用户重新进行按压，直至判断手指的按压区域包含指纹中心。
作为一种可选的实施例，若判断手指的按压区域包含指纹中心，则继续进行血压检测。可以参见前述内容，通过所述第一光源和所述第二光源打光，进而指纹检测装置101获取到所述第一PPG信号和所述第二PPG信号。可选的，可以仅点亮以所述指纹中心在所述显示屏的正投影为中心、宽为R、长为S的长方形范围内的发光像素，来进一步降低进行血压检测时的功耗，其中，宽的方向为沿着手指长度的方向，长的方向为手指宽度的方向，可以参考图3中所示的长方形202，依据长方形202所示的打光区域,能够充分照射到指纹中心附近的掌横弓动脉，考虑到不同的人群的掌横弓动脉位置离散在指纹中心在±1mm处范围内，可选的，R小于等于3mm，S大于等于手指的宽度，例如，S大于等于8mm，既保证了发光像素能够照射到掌横弓动脉所处的区域，又能降低电子设备进行血压检测时的功耗。
本申请实施例中，所述血压检测可以由所述处理器完成，例如所述处理器可以执行血压检测的各种信号处理。
本申请实施例还提供了一种电子设备，包括显示屏和指纹检测装置，其中所述指纹检测装置设置在所述显示屏的下方，用于进行血压检测。具体的，所述指纹检测装置可以设置在所述显示屏的指纹检测区域的下方，用于获取 手指的指纹信息或者用户的血压信息。
所述电子设备还包括压力传感器，所述压力传感器与所述指纹识别装置相邻设置在所述显示屏的下方。压力传感器与指纹识别装置相邻设置，能够使得用户手指按压在显示屏进行血压检测时，使得指纹检测装置在获取PPG信号的时候，压力传感器能用于获取用户手指按压显示屏的按压压力，因而获取到更加准确的血压。所述电子设备可以为手机、平板电脑等可移动电子设备。
所述电子设备还可以包括光源，关于电子设备的相关内容请参考图1和图2的相关内容，这里不再赘述。
图5给出了本申请实施例的一种血压检测方法，血压检测方法包括：S501、在第一时刻，指纹检测装置接收被用户手指反射回来并穿过显示屏的第一光信号，所述第一光信号为第一光源发出的第一波长的光信号，所述第一光信号用于获取第一PPG信号；
S502、在第二时刻，指纹检测装置接收被用户手指反射回来并穿过所述显示屏的第二光信号，所述第二光信号为所述第二光源发出的第二波长的光信号，所述第二光信号用于获取第二PPG信号；
S503、根据所述第一PPG信号和所述第二PPG信号获取第三PPG信号，其中，所述第三PPG信号用于获取用户的血压，所述第一波长与所述第二波长不同。
本申请实施例的血压检测方法适用于图1和图2所示的指纹检测装置，或者电子设备，该指纹检测装置除了具有检测功能的同时，还用来进行血压检测，因而不用额外再设置血压检测的装置，能够大幅降低电子设备的成本。相关内容可以参见图1至图4所述内容，这里不再详述。
在开始进行血压检测之前，可以引导用户将手指放置在显示屏的指纹检测区域。指纹检测装置可以设置在显示屏的指纹检测区域的下方，用于获取手指的指纹信息或者用户的血压信息。
本申请提供的血压检测方法，采用屏下指纹检测装置获取PPG信号，进一步来获取用户的血压，由于搭载屏下指纹检测装置的电子设备体积较小便于携带，因而能够方便用户进行全天候的血压检测。此外，本申请中利用至少两种不同波长的光源来获得不同波长的PPG信号，通过至少两个不同 波长的PPG信号进一步得到更接近深层血管的PPG信号，使得最终得到的血压更接近真实值。
本申请实施例中的显示屏可以为自发光显示屏，例如OLED显示屏，第一光源和第二光源可以为显示屏的发光像素，此时，可以直接利用显示屏的发光像素作为血压检测或者指纹检测的激励光源，无需额外增加光源，能够降低成本，此外，利用显示屏的发光像素作为激励光源，发光更加均匀，能够获得更加准确的血压值或使得指纹检测结果更加准确。OLED显示屏的发光像素包括红色、蓝色和绿色的发光像素，能够作为血压检测或者指纹检测的激励光源。在进行血压检测时，可以将不同光源进行分时打光，如前面所述，可以在第一时刻和第二时刻采用不同波长的光源发光，指纹检测装置在第一时刻和第二时刻接收相应的光源发出的光信号，采用不同波长的光源分时打光，能够进一步获得更接近深层血管的PPG信号，使得最终得到的血压更接近真实值。在进行指纹检测时，可以只采用某一种颜色或某一种波长的光源进行打光，也可以采用多种颜色或多种波长的光源同时打光，由于指纹检测主要检测的是用户手指的谷脊纹路信息，无需获取深层血管的信息，只采用某一种颜色进行打光，或者采用多种颜色的光源同时进行打光，能够进一步提升指纹检测的效率，提升用户体验。可以理解的是，当指纹检测装置应用于具有非自发光显示屏的电子设备中时，可以额外设置光源，并将光源设置在显示屏的下方或者与显示屏并排设置，本申请实施例不做限制。可以理解的是，颜色不同的光源，其发光的波长也不相同。
可选的，所述第一光源为红光光源，所述第二光源为蓝光光源或者绿光光源。由于红光的穿透能力强，能够到达深层血管，换句话说，当红光被手指反射回来并到达指纹检测装置，或者说到达指纹检测装置的像素单元阵列时，红光同时携带了深层血管和浅层血管的信息，因而能利用红光同时捕获到深层血管和浅层血管的PPG信号。绿光或者蓝光穿透能力弱，只能到达浅层血管，例如表皮毛细血管，换句话说，当绿光或者蓝光被手指反射回来并到达指纹检测装置，或者说到达指纹检测装置的像素单元阵列时，绿光或者蓝光仅携带了浅层血管的信息，因而利用绿光或者蓝光仅能获取到浅层血管的PPG信号，因此能够通过所述第一PPG信号和所述第二PPG信号计算获取到深层血管的PPG信号，即所述第三PPG信号。
S503中所述“根据所述第一PPG信号和所述第二PPG信号获取第三PPG信号”包括：对所述第一PPG信号和所述第二PPG信号做差获取所述第三PPG信号；或者对所述第一PPG信号和所述第二PPG信号进行归一化获取所述第三PPG信号。
参见图6，所述血压检测方法还包括：
S504：获取用户手指按压所述显示屏的按压压强，根据所述第三PPG信号和所述按压压强获取用户的血压。
按压压强包含了压力维度的信息能够提升血压检测的准确性。人群血压统计在40mmHg～200mmHg，可以利用200mmHg作为判定采集结束的条件，另外，由于手指按压压强大于200mmHg的时候，手指血流被阻断，PPG信号消失，故也可以根据PPG信号幅值来做判定。当PPG信号幅值低于某一设定值的时候，结束PPG信号采集。
作为一种可选的实施例，当按压压强大于等于第三阈值时，结束所述第一PPG信号或者所述第二PPG信号的采集。所述第三阈值为200mmHg。或者所述第一PPG信号/第二PPG信号的幅值小于第四阈值的时候，结束所述第一PPG信号/所述第二PPG信号的采集。
参见图7，所述血压检测方法S504中，所述“获取用户手指按压所述显示屏的按压压强”包括：
S5041：根据用户手指在所述显示屏的按压面积，以及用户手指在所述显示屏的按压压力获取用户手指在所述显示屏的按压压强，其中，用户手指在所述显示屏的按压面积通过所述指纹检测装置或者所述显示屏获取。
可选的，可以通过压力传感器获取用户手指在所述显示屏的按压压力，所述压力传感器可以与所述指纹检测装置相邻设置在所述显示屏的下方。在血压检测时，使得所述指纹检测装置在获取PPG信号的时候，还能通过压力传感器获取到用户手指按压所述显示屏的按压压力，因而在进一步获取所述按压压强后能通过所述按压压强和所述第三PPG信号获取到更加准确的血压。
可选的，可以通过所述指纹检测装置获取用户手指在所述显示屏的按压面积。当用户手指按压在所述显示屏的指纹检测区域的上方，所述指纹检测装置用于接收所述光源照射到用户手指，并被用户手指反射后穿过所述显示 屏的光信号，进而能够获取用户手指在所述显示屏的按压面积。当所述光源为所述显示屏的发光像素时，发光像素发出的光信号照射到用户手指并被手指的表面反射后，被所述指纹检测装置接收到后，得到用户手指按压在所述显示屏上的按压面积。例如显示屏为OLED显示屏，所述指纹检测区域对应的发光像素均发光，这部分发光像素可以包括红色、蓝色和绿色的发光像素，能够作为获取所述按压面积的激励光源。
作为一种具体的实施例，所述指纹检测装置接收到用户手指表面反射的光信号后形成指纹图像，所述指纹图像经过处理后可以得到用户手指按压在所述显示屏上的按压面积，所述光信号由所述光源发出。具体的，所述指纹检测装置的处理器可以用于处理所述指纹图像进而获取所述按压面积。
手指的掌横弓动脉的血压值相比于其他的微小动脉更接近于体内大动脉的血压值，掌横弓动脉的粗细为0.85±0.1mm，长度接近手指宽度，由于掌横弓动脉位于手指的指纹中心位置附近，为了获取更加准确的血压值，所述血压检测的方法中“用户手指在所述显示屏的按压面积通过所述指纹检测装置或者所述显示屏获取”包括：
所述指纹检测装置根据接收到的用户手指表面反射的光信号形成指纹图像；
根据所述指纹图像判断用户手指的按压区域是否包含指纹中心；
若判断用户手指的按压区域没有包含指纹中心，则结束血压检测；
若判断手指的按压区域包含指纹中心，则继续进行血压检测。
作为一种可选的实施例，若判断用户手指的按压区域没有包含指纹中心，可以提示用户重新进行按压，直至判断用户手指的按压区域包含指纹中心。
可以理解的是，若手指按压位置偏移，例如指尖按压或者边手指缘按压，此时获取的指纹图像不包括指纹中心，这样的按压位置并不包括手指的掌横弓动脉，因而进行血压检测时不能获取准确的血压值。
“根据所述指纹图像判断用户手指的按压区域是否包含指纹中心”包括：采用切线法判断用户手指的按压区域是否包含指纹中心。具体的，可以在指纹图像上任意找两条非平行的指纹纹路，并对这两条指纹纹路分别做切线，若两条法线的焦点位于所述指纹图像内，那么代表用户手指的按压区域包含指纹中心，若两条法线的焦点位于所述指纹图像外，那么代表手指的按压区 域不包含指纹中心。
作为一种可选的实施例，若判断手指的按压区域包含指纹中心，则继续进行血压检测。可以参见前述内容，通过所述第一光源和所述第二光源打光，进而所述指纹检测装置获取到所述第一PPG信号和所述第二PPG信号。可选的，可以仅点亮以所述指纹中心在所述显示屏的正投影为中心、宽为R、长为S的长方形范围内的发光像素，来进一步降低进行血压检测时的功耗，其中，宽的方向为沿着手指长度的方向，长的方向为手指宽度的方向，可以参考图3中所示的长方形202，依据长方形202所示的打光区域,能够充分照射到指纹中心附近的掌横弓动脉，考虑到不同的人群的掌横弓动脉位置离散在指纹中心在±1mm处范围内，可选的，R小于等于3mm，S大于等于手指的宽度，例如，S大于等于8mm，既保证了发光像素能够照射到掌横弓动脉所处的区域，又能降低进行血压检测时的功耗。
作为另一种可选的实施例，所述显示屏用于获取用户手指在所述显示屏的按压面积。例如显示屏为具有触控功能的触控一体显示屏，此时，可以通过触控功能来获取用户手指在所述显示屏的按压面积。这种情况下不需要利用指纹检测装置来形成指纹图像进而获取所述按压面积，能够减少流程提高血压检测的效率。
可以理解的是，所述压力传感器能够测出按压压力随时间变化的值，因而通过结合按压面积能够获取压强随时间变化的值。
为了得到更准确的用户的血压，所述“根据所述第三PPG信号和所述按压压强获取用户的血压。”包括：
S5042：根据所述第三PPG信号的强度对所述指纹检测装置中的多个像素单元分别获取的第三PPG信号由大至小进行排序，并保留排序后的所述第三PPG信号中排列序号小于等于第一阈值的信号，所述第一阈值为所述第三PPG信号的排列序号与所述第三PPG信号数量的比值，其中，排列序号小于等于所述第一阈值的所述第三PPG信号为第四PPG信号。
所述第一阈值可以为30％，25％或者20％。如果光源未照射到深层血管，那么得到的所述第三PPG信号就会比较微弱，为了进一步提升血压检测的准确性，可以保留依据强度由大到小排序后的排列顺序小于第一阈值的所述第三PPG信号，即保留强度较大的第三PPG信号，这样通过筛选出来的强 度较大的第三PPG信号(即第四PPG信号)能够得到更加准确的血压值。由于排列顺序位于后面的第三PPG信号的比较微弱，因此将排列顺序大于所述第一阈值的第三PPG信号丢弃，不仅不会影响血压的测量，反而能够得到更加准确的血压值。具体可以参见前述内容中列举的例子，这里不再详述。
S504进一步还包括：
S5043：根据所述第四PPG信号和所述按压压强获取所述第四PPG信号的峰峰值最大时刻的按压压强。
根据所述第四PPG信号的峰峰值最大时刻的按压压强即可获得用户的血压。
参照图8，S504进一步还可以包括：
S5044：根据所述按压压强将所述指纹检测装置中的多个像素单元分别获取的第四PPG信号由大到小进行排序，得到第四PPG信号包络，并保留所述第四PPG信号包络中排列序号小于等于第二阈值的信号，所述第二阈值为所述第四PPG信号的排列序号与所述第四PPG信号数量的比值，其中，排列序号小于等于所述第二阈值的所述第四PPG信号为第五PPG信号。
可选的，所述第二阈值可以为30％，25％或者20％。所述第四PPG信号包络峰值对应的压强越大，代表该像素单元获取到的深层大动脉信号越多。因此，进一步筛选出小于等于所述第二阈值的第四PPG信号能够进一步提高血压检测的准确性。由于排列顺序位于前面的第四PPG信号携带的信息更加接近体内的大动脉，因此将排列顺序大于所述第二阈值的第四PPG信号丢弃，不仅不会影响血压的测量，反而能够得到更加准确的血压值。具体可以参见前述内容中列举的例子，这里不再详述。
此外，若位置偏离较大的孤立像素单元，可能是信号干扰，比如交感神经的活动，可以直接丢弃，因此还可以丢弃或者剔除所述指纹检测装置中孤立的像素单元对应获取的所述第五PPG信号，所述孤立的像素单元指与之相邻的像素单元获取的所述第四PPG信号被丢弃。
S504进一步还包括：
S5035：丢弃所述指纹检测装置中孤立的像素单元对应获取的所述第五PPG信号，所述孤立的像素单元指与之相邻的像素单元获取的所述第四PPG 信号被丢弃，其中，丢弃所述孤立的像素单元对应获取的所述第五PPG信号之后剩余的第五PPG信号为第六PPG信号。
因为掌横弓动脉是带状分布的血管，且具有一定的宽度，在这一步保留下来的第五PPG信号，也就是第六PPG信号对应的像素单元理应是带状分布的。至此，保留下来的第六PPG信号对应的像素单元与掌横弓动脉走向一致，即获得了掌横弓动脉的PPG信号及其包络，用这部分的像素单元获得的PPG信号进行血压计算，更接近体内大动脉的血压。
S5036：根据所述第六PPG信号和所述按压压强获取用户的血压。
具体可以根据所述第六PPG信号形成的第六PPG信号包络获取用户的平均动脉压，接着根据所述平均动脉压获取用户的血压，具体的可以根据系数法或者双高斯拟合法计算出血压值，计算血压值的方法本申请实施例不限定，只要能够计算得到用户的血压即可。其中，平均动脉压可以为第六PPG信号包络峰值对应的压强。
应理解，本申请实施例的处理单元或者处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。可以理解，本申请实施例的血压检测装置还可以包括存储单元或者存储器，存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
在本申请所提供的几个实施例中，应所述理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是 示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者所述技术方案的部分可以以软件产品的形式体现出来，所述计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。

Claims (35)

  1. 一种指纹检测装置，其特征在于，适用于具有显示屏的电子设备，所述指纹检测装置设置在所述显示屏的下方，用于进行血压检测，所述电子设备包括光源，所述光源包括第一光源和第二光源，其中，所述指纹检测装置用于在第一时刻接收被用户手指反射回来并穿过所述显示屏的第一光信号，所述第一光信号为所述第一光源发出的第一波长的光信号；
    所述指纹检测装置用于在第二时刻接收被用户手指反射回来并穿过所述显示屏的第二光信号，所述第二光信号为所述第二光源发出的第二波长的光信号；
    其中，所述第一波长与所述第二波长不同，所述第一光信号用于获取第一PPG信号，所述第二光信号用于获取第二PPG信号，所述第一PPG信号和所述第二PPG信号用于获取第三PPG信号，所述第三PPG信号用于获取用户的血压。
  2. 根据权利要求1所述的指纹检测装置，其特征在于，所述显示屏为OLED显示屏，所述光源为所述OLED显示屏的发光像素。
  3. 根据权利要求2所述的指纹检测装置，其特征在于，所述第一光源为红色发光像素，所述第二光源为蓝色发光像素或者绿色发光像素。
  4. 根据权利要求1所述的指纹检测装置，其特征在于，所述指纹检测装置用于通过对所述第一PPG信号和所述第二PPG信号做差获取所述第三PPG信号；或者
    所述指纹检测装置用于通过对所述第一PPG信号和所述第二PPG信号进行归一化获取所述第三PPG信号。
  5. 根据权利要求1所述的指纹检测装置，其特征在于，所述指纹检测装置用于根据所述第三PPG信号和用户手指在所述显示屏的按压压强获取用户的血压。
  6. 根据权利要求5所述的指纹检测装置，其特征在于，所述指纹检测装可以用于根据用户手指在所述显示屏的按压面积，以及用户手指在所述显示屏的按压压力获取用户手指在所述显示屏的按压压强，其中，用户手指在所述显示屏的按压面积通过所述指纹检测装置或者所述显示屏获取。
  7. 根据权利要求6所述的指纹检测装置，其特征在于，所述指纹检测 装置用于接收到用户手指表面反射的光信号后形成指纹图像，所述指纹图像用于获取用户手指按压在所述显示屏上的按压面积，所述光信号由所述光源发出。
  8. 根据权利要求1或5所述的指纹检测装置，其特征在于，所述指纹检测装置用于根据所述第三PPG信号的强度对所述指纹检测装置中的多个像素单元分别获取的第三PPG信号由大至小进行排序，并且保留排序后的所述第三PPG信号中排列序号小于等于第一阈值的信号，所述第一阈值为所述第三PPG信号的排列序号与所述第三PPG信号数量的比值，其中，排列序号小于等于所述第一阈值的第三PPG信号为第四PPG信号。
  9. 根据权利要求8所述的指纹检测装置，其特征在于，所述第一阈值为30％，25％或者20％。
  10. 根据权利要求8所述的指纹检测装置，其特征在于，所述指纹检测装置用于根据所述第四PPG信号和所述按压压强获取所述第四PPG信号的峰峰值最大时刻的按压压强。
  11. 根据权利要求8所述的指纹检测装置，其特征在于，所述指纹检测装置用于根据所述按压压强将所述指纹检测装中的多个像素单元分别获取的所述第四PPG信号由大到小进行排序，得到第四PPG信号包络，并且保留所述第四PPG信号包络中排列序号小于等于第二阈值的信号，所述第二阈值为所述第四PPG信号的排列序号与所述第四PPG信号数量的比值，其中，排列序号小于等于所述第二阈值的所述第四PPG信号为第五PPG信号。
  12. 根据权利要求11所述的指纹检测装置，其特征在于，所述第二阈值为30％，25％或者20％。
  13. 根据权利要求11所述的指纹检测装置，其特征在于，所述指纹检测装置还用于丢弃所述指纹检测装置中孤立的像素单元对应获取的所述第五PPG信号，所述孤立的像素单元指与之相邻的像素单元对应获取的第四PPG信号被丢弃，其中，丢弃所述孤立的像素单元对应获取的所述第五PPG信号之后，剩余的所述第五PPG信号为第六PPG信号，所述第六PPG信号用于获取用户的血压。
  14. 根据权利要求7所述的指纹检测装置，其特征在于，所述指纹检测装置用于根据所述指纹图像判断用户手指的按压区域是否包含指纹中心，若 判断用户手指的按压区域没有包含指纹中心，则结束血压检测。
  15. 根据权利要求1所述的指纹检测装置，其特征在于，所述指纹检测装置包括处理器，所述处理器被配置进行所述血压检测。
  16. 一种电子设备，其特征在于，包括：
    显示屏、如权利要求1至15中任一项所述的指纹检测装置，其中所述指纹检测装置设置在所述显示屏的下方，用于进行血压检测。
  17. 根据权利要求16所述的电子设备，其特征在于，所述电子设备还包括压力传感器，所述压力传感器与所述指纹识别装置相邻设置在所述显示屏的下方。
  18. 根据权利要求16所述的电子设备，其特征在于，所述电子设备还包括光源，所述显示屏为OLED显示屏，所述光源为所述OLED显示屏的发光像素。
  19. 一种血压检测方法，其特征在于，包括：
    在第一时刻，指纹检测装置接收被用户手指反射回来并穿过显示屏的第一光信号，所述第一光信号为第一光源发出的第一波长的光信号，所述第一光信号用于获取第一PPG信号；
    在第二时刻，指纹检测装置接收被用户手指反射回来并穿过所述显示屏的第二光信号，所述第二光信号为所述第二光源发出的第二波长的光信号，所述第二光信号用于获取第二PPG信号；
    根据所述第一PPG信号和所述第二PPG信号获取第三PPG信号，其中，所述第三PPG信号用于获取用户的血压，所述第一波长与所述第二波长不同。
  20. 根据权利要求19所述的血压检测方法，其特征在于，所述显示屏为OLED显示屏，所述第一光源和所述第二光源为所述OLED显示屏的发光像素。
  21. 根据权利要求20所述的血压检测方法，其特征在于，所述第一光源为红色发光像素，所述第二光源为蓝色发光像素或者绿色发光像素。
  22. 根据权利要求19所述的血压检测方法，其特征在于，根据“所述第一PPG信号和所述第二PPG信号获取第三PPG信号”包括：
    对所述第一PPG信号和所述第二PPG信号做差获取所述第三PPG信号； 或者
    对所述第一PPG信号和所述第二PPG信号进行归一化获取所述第三PPG信号。
  23. 根据权利要求20所述的血压检测方法，其特征在于，所述血压检测方法还包括：
    获取用户手指按压所述显示屏的按压压强，根据所述第三PPG信号和所述按压压强获取用户的血压。
  24. 根据权利要求23所述的血压检测方法，其特征在于，所述“获取用户手指按压所述显示屏的按压压强”包括：
    根据用户手指在所述显示屏的按压面积，以及用户手指在所述显示屏的按压压力获取用户手指在所述显示屏的按压压强，其中，用户手指在所述显示屏的按压面积通过所述指纹检测装置或者所述显示屏获取。
  25. 根据权利要求24所述的血压检测方法，其特征在于，“用户手指在所述显示屏的按压面积通过所述指纹检测装置或者所述显示屏获取”包括：
    所述指纹检测装置根据接收到的用户手指表面反射的光信号形成指纹图像，所述指纹图像用于获取用户手指在所述显示屏的按压面积。
  26. 根据权利要求20或23所述的血压检测方法，其特征在于，所述“根据所述第三PPG信号和所述按压压强获取用户的血压。”包括：
    根据所述第三PPG信号的强度对所述指纹检测装置中的多个像素单元分别获取的第三PPG信号由大至小进行排序，并且保留排序后的所述第三PPG信号中排列序号小于等于第一阈值的信号，所述第一阈值为所述第三PPG信号的排列序号与所述第三PPG信号数量的比值，其中，排列序号小于等于所述第一阈值的第三PPG信号为第四PPG信号。
  27. 根据权利要求26所述的血压检测方法，其特征在于，所述第一阈值为30％，25％或者20％。
  28. 根据权利要求26所述的血压检测方法，其特征在于，所述“获取用户手指按压所述显示屏的按压压强，根据所述第三PPG信号和所述按压压强获取用户的血压。”还包括：
    根据所述第四PPG信号和所述按压压强获取所述第四PPG信号的峰峰值最大时刻的按压压强。
  29. 根据权利要求26所述的血压检测方法，其特征在于，所述“获取用户手指按压所述显示屏的按压压强，根据所述第三PPG信号和所述按压压强获取用户的血压。”还包括：
    根据所述按压压强将所述指纹检测装置中的多个像素单元分别获取的所述第四PPG信号由大到小进行排序，得到第四PPG信号包络，并且保留所述第四PPG信号包络中排列序号小于等于第二阈值的信号，所述第二阈值为所述第四PPG信号的排列序号与所述第四PPG信号数量的比值，其中，排列序号小于等于所述第二阈值的所述第四PPG信号为第五PPG信号。
  30. 根据权利要求26所述的血压检测方法，其特征在于，所述第二阈值为30％，25％或者20％。
  31. 根据权利要求29所述的血压检测方法，其特征在于，所述“获取用户手指按压所述显示屏的按压压强，根据所述第三PPG信号和所述按压压强获取用户的血压。”还包括：
    丢弃所述指纹检测装置中孤立的像素单元对应获取的所述第五PPG信号，所述孤立的像素单元指与之相邻的像素单元对应获取的所述第四PPG信号被丢弃，其中，丢弃所述孤立的像素单元对应获取的所述第五PPG信号之后，剩余的所述第五PPG信号为第六PPG信号；
    根据所述第六PPG信号和所述按压压强获取用户的血压。
  32. 根据权利要求31所述的血压检测方法，其特征在于，所述“获取用户手指按压所述显示屏的按压压强，根据所述第三PPG信号和所述按压压强获取用户的血压。”还包括：
    根据所述第六PPG信号形成的第六PPG信号包络获取用户的平均动脉压，根据所述平均动脉压获取用户的血压。
  33. 根据权利要求25所述的血压检测方法，其特征在于，“用户手指在所述显示屏的按压面积通过所述指纹检测装置或者所述显示屏获取”还包括：
    根据所述指纹图像判断用户手指的按压区域是否包含指纹中心；
    若判断用户手指的按压区域没有包含指纹中心，则结束血压检测；
    若判断手指的按压区域包含指纹中心，则继续进行血压检测。
  34. 根据权利要求33所述的血压检测方法，其特征在于，“根据所述指纹图像判断用户手指的按压区域是否包含指纹中心”包括：
    采用切线法判断用户手指的按压区域是否包含指纹中心，所述切线法为在所述指纹图像上任意找两条非平行的指纹纹路，并对这两条指纹纹路分别做切线；
    若两条法线的焦点位于所述指纹图像内，则用户手指的按压区域包含所述指纹中心；
    若两条法线的焦点位于所述指纹图像外，则用户手指的按压区域不包含所述指纹中心。
  35. 根据权利要求34所述的血压检测方法，其特征在于，若用户手指的按压区域包含指纹中心，点亮以所述指纹中心在所述显示屏的正投影为中心、宽为R、长为S的长方形范围内的发光像素，其中，宽的方向为沿着手指长度的方向，长的方向为手指宽度的方向，R小于等于3mm。
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