CN112869720B - Fingerprint detection device and electronic equipment - Google Patents
Fingerprint detection device and electronic equipment Download PDFInfo
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- CN112869720B CN112869720B CN202110180409.6A CN202110180409A CN112869720B CN 112869720 B CN112869720 B CN 112869720B CN 202110180409 A CN202110180409 A CN 202110180409A CN 112869720 B CN112869720 B CN 112869720B
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- 238000001514 detection method Methods 0.000 title claims abstract description 213
- 230000036772 blood pressure Effects 0.000 claims abstract description 145
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Classifications
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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
- A61B5/02108—Measuring pressure in heart or blood vessels from analysis of pulse wave characteristics
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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
- A61B5/117—Identification of persons
- A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
- A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
- A61B5/224—Measuring muscular strength
- A61B5/225—Measuring muscular strength of the fingers, e.g. by monitoring hand-grip force
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/74—Details of notification to user or communication with user or patient ; user input means
- A61B5/742—Details of notification to user or communication with user or patient ; user input means using visual displays
- A61B5/7445—Display arrangements, e.g. multiple display units
Abstract
The fingerprint detection device and the electronic equipment are provided, so that a user can conveniently monitor all-weather blood pressure. The fingerprint detection device is suitable for electronic equipment with a display screen and is arranged below the display screen and used for blood pressure detection, the electronic equipment comprises a first light source and a second light source, the fingerprint detection device is used for receiving a first light signal reflected by a finger of a user and penetrating through the display screen at a first moment, and the first light signal is a light signal with a first wavelength emitted by the first light source; the fingerprint detection device is used for receiving a second optical signal reflected by the finger of the user and penetrating through the display screen at a second moment, wherein the second optical signal is an optical signal with a second wavelength emitted by a second light source; the first wavelength is different from the second wavelength, the first optical signal is used for obtaining a first PPG signal, the second optical signal is used for obtaining a second PPG signal, the first PPG signal and the second PPG signal are used for obtaining a third PPG signal, and the third PPG signal is used for obtaining the blood pressure of a user.
Description
Technical Field
The present application relates to the field of electronics, and more particularly, to a fingerprint detection device and an electronic apparatus.
Background
With the continuous improvement of the current living standard, the proportion of the population suffering from hypertension is rapidly increased. Currently, the mature blood pressure detection method in the market is a cuff type detection method based on an auscultation method or an oscillography method, wherein the auscultation method requires a professional operator to judge the blood pressure based on the sound of brachial artery blood flow, and is suitable for medical scenes; the oscillometric method is to inflate the cuff to block arterial blood flow, then detect the pressure of the air in the cuff and extract weak pulse wave in the process of exhausting, and detect the blood pressure value according to the change of the pulse wave along with the pressure in the cuff. For patients with hypertension, the accuracy of blood pressure measurement and portability of the sphygmomanometer are very important, and although the blood pressure measurement of the sphygmomanometer by adopting the cuff type detection method is accurate, the sphygmomanometer is large in size and inconvenient to carry, and all-weather blood pressure monitoring cannot be carried out, so that the requirements of the patients with hypertension cannot be met. Therefore, how to facilitate all-weather blood pressure monitoring for users is a urgent problem to be solved.
Disclosure of Invention
The embodiment of the application provides a fingerprint detection device, electronic equipment and a blood pressure detection method, which can facilitate all-weather blood pressure monitoring of a user.
In a first aspect, a fingerprint detection device is provided, and 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 comprises a light source, the light source comprises a first light source and a second light source, the fingerprint detection device is used for receiving a first optical signal reflected by a finger of a user and passing through the display screen at a first moment, and the first optical signal is an optical signal with a first wavelength emitted by the first light source; the fingerprint detection device is used for receiving a second optical signal reflected by a finger of a user and passing through the display screen at a second moment, wherein the second optical signal is an optical signal with a second wavelength emitted by the second light source; the first wavelength is different from the second wavelength, the first optical signal is used for acquiring a first PPG signal, the second optical signal is used for acquiring a second PPG signal, the first PPG signal and the second PPG signal are used for acquiring a third PPG signal, and the third PPG signal is used for acquiring blood pressure of a user.
In a second aspect, an electronic device is provided, including a display screen, a fingerprint detection device according to the first aspect, where the fingerprint detection device is arranged below the display screen for blood pressure detection.
In a third aspect, a blood pressure detection method is provided, comprising:
at a first moment, the fingerprint detection device receives a first optical signal reflected by a finger of a user and passing through the display screen, wherein the first optical signal is an optical signal with a first wavelength emitted by a first light source, and the first optical signal is used for acquiring a first PPG signal; at a second moment, the fingerprint detection device receives a second optical signal reflected by a finger of a user and passing through the display screen, wherein the second optical signal is an optical signal with a second wavelength emitted by the second light source, and the second optical signal is used for acquiring a second PPG signal; and acquiring a third PPG signal according to the first PPG signal and the second PPG signal, wherein the third PPG signal is used for acquiring blood pressure of a user, and the first wavelength is different from the second wavelength.
In the embodiment that this application provided, adopt fingerprint detection device under screen to acquire the PPG signal, further obtain user's blood pressure, because carry fingerprint detection device under the screen's electronic equipment volume is less portable, therefore can make things convenient for the user to carry out all-weather blood pressure detection. In addition, at least two light sources with different wavelengths are utilized to obtain PPG signals with different wavelengths, and the PPG signals which are closer to the deep blood vessel are further obtained through the PPG signals with the different wavelengths, so that the finally obtained blood pressure is closer to a true value. Besides, the fingerprint detection device has the fingerprint detection function and is also used for carrying out blood pressure detection, so that the additional blood pressure detection device is not needed, and the cost of the electronic equipment can be greatly reduced.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device to which the fingerprint detection device provided in the embodiment of the present application is applicable.
Fig. 2 is a schematic sectional view of an electronic device to which the fingerprint detection device provided in the embodiment of the present application is applicable.
Fig. 3 is a schematic view of the transverse arch artery of the palm of the finger.
Fig. 4 is a schematic diagram of a tangential method for acquiring whether a pressing area of a finger pressing display screen contains a fingerprint center according to a fingerprint image.
Fig. 5 is a schematic flow chart diagram of a blood pressure detection method according to an embodiment of the present application.
Fig. 6 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.
Fig. 7 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.
Fig. 8 is a schematic flow chart diagram of another blood pressure detection method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It should be understood that the specific examples herein are intended only to facilitate a better understanding of the embodiments of the present application by those skilled in the art and are not intended to limit the scope of the embodiments of the present application.
It should also be understood that, in various embodiments of the present application, the size of the sequence number of each process does not mean that the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
It should also be understood that the various embodiments described in this specification may be implemented alone or in combination, and that the examples herein are not limited in this regard.
Unless defined otherwise, all technical and scientific terms used in the examples of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
In order to meet the needs of users, the fingerprint detection device can be used for conveniently carrying out all-weather blood pressure detection so as to monitor the physical health condition at any time, and is suitable for electronic equipment with a display screen, wherein the fingerprint detection device is arranged below the display screen and is used for carrying out blood pressure detection, the electronic equipment comprises a light source, the light source comprises a first light source and a second light source, the fingerprint detection device is used for receiving a first light signal reflected by a finger of a user and penetrating through the display screen at a first moment, and the first light signal is a light signal with a first wavelength emitted by the first light source;
The fingerprint detection device is used for receiving a second optical signal reflected by a finger of a user and passing through the display screen at a second moment, wherein the second optical signal is an optical signal with a second wavelength emitted by the second light source;
the first wavelength is different from the second wavelength, the first optical signal is used for acquiring a first PPG signal, the second optical signal is used for acquiring a second PPG signal, the first PPG signal and the second PPG signal are used for acquiring a third PPG signal, and the third PPG signal is used for acquiring blood pressure of a user.
In the embodiment provided by the application, the fingerprint detection device under the screen is adopted to acquire a Photoplethysmography (PPG) signal, so that the blood pressure of a user is further acquired, and the electronic equipment carrying the fingerprint detection device under the screen is small in size and convenient to carry, so that the user can conveniently detect all-weather blood pressure. In addition, at least two light sources with different wavelengths are utilized to obtain PPG signals with different wavelengths, and the PPG signals which are closer to the deep blood vessel are further obtained through the PPG signals with the different wavelengths, so that the finally obtained blood pressure is closer to a true value. Besides, the fingerprint detection device has the fingerprint detection function and is also used for carrying out blood pressure detection, so that the additional blood pressure detection device is not needed, and the cost of the electronic equipment can be greatly reduced.
Fig. 1 is a schematic diagram of an electronic device to which the fingerprint detection device according to the embodiment of the present application is applied, and fig. 2 is a cut-away view of the electronic device shown in fig. 1. The electronic device 100 comprises a fingerprint detection device 101 and a display screen 102, the fingerprint detection device 101 being arranged below the display screen 102 for blood pressure detection. Specifically, the fingerprint detection device 101 may be disposed below a 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. Optionally, the electronic device 100 may further include a protective cover 103, where the protective cover 103 is disposed above the display screen 102 to protect the display screen, and specifically, the protective cover 103 may be a glass cover or a sapphire cover, etc.
The fingerprint detection device 101 comprises an array of pixel cells (not shown in fig. 1) comprising a plurality of pixel cells for receiving the light signal and converting it into a corresponding electrical signal, e.g. a PPG signal, a pixel of a fingerprint image.
The electronic device 100 comprises a light source, which may be a light emitting pixel 1021 of a display screen 102, the display screen 102 being a self-emissive display screen, such as an OLED display screen. At this time, the luminous pixels of the display screen can be directly used as excitation light sources for blood pressure detection or fingerprint detection, the cost can be reduced without adding additional light sources, and in addition, the luminous pixels of the display screen are used as the excitation light sources, so that the luminous effect is more uniform, more accurate blood pressure values can be obtained or the fingerprint detection result is more accurate. The luminous pixels of the OLED display screen comprise red, blue and green luminous pixels and can be used as excitation light sources for blood pressure detection or fingerprint detection. When blood pressure detection is performed, different light sources can be used for time-sharing lighting, as described above, light sources with different wavelengths can be used for lighting at the first time and the second time, the fingerprint detection device 101 receives light signals sent by corresponding light sources at the first time and the second time, and the PPG signals which are closer to deep blood vessels can be further obtained by time-sharing lighting of the light sources with different wavelengths, so that the finally obtained blood pressure is closer to a true value. When fingerprint detection is carried out, only a light source with a certain color or a certain wavelength can be adopted for polishing, and light sources with various colors or various wavelengths can be adopted for polishing simultaneously. It can be appreciated that when the fingerprint detection device is applied to an electronic device having a non-self-luminous display screen, the light source may be additionally disposed, and the light source may be disposed below the display screen or disposed side by side with the display screen. It will be appreciated that light sources of different colours will emit light of different wavelengths.
Optionally, the first light source is a red light source, and the second light source is a blue light source or a green light source. Referring to fig. 2, it is assumed that the red light source is a red light emitting pixel in the display screen 102, and due to the strong penetrating power of the red light, the red light can reach deep blood vessels, in other words, when the red light is reflected by a finger and reaches the fingerprint detection device or reaches the pixel unit array of the fingerprint detection device 101, the red light carries information of the deep blood vessels and shallow blood vessels at the same time, so that PPG signals of the deep blood vessels and the shallow blood vessels can be captured at the same time by using the red light, for example, after the red light emitting pixel emits a light signal 105 and is reflected by the finger 200, the light signal 106 and the light signal 107 carry information of the shallow blood vessels and the deep blood vessels respectively, wherein 201 is the deep blood vessels of the finger, for example, a palmar transverse arch artery. The green light or blue light has a weak penetration capability and can only reach a shallow blood vessel (not shown in fig. 2), such as an epidermal capillary, in other words, when the green light or blue light is reflected by a finger and reaches the fingerprint detection device, or reaches the pixel unit array of the fingerprint detection device 101, the green light or blue light only carries the information of the shallow blood vessel, so that only the PPG signal of the shallow blood vessel can be obtained by using the green light or blue light, and thus the PPG signal of the deep blood vessel, that is, the third PPG signal, can be obtained by calculating the first PPG signal and the second PPG signal.
Optionally, the third PPG signal may be obtained by differencing the first PPG signal and the second PPG signal, i.e. the third PPG signal is the difference between the first PPG signal and the second PPG signal, or by normalizing the first PPG signal and the second PPG signal. Thereby a blood pressure closer to the true value can be further obtained from the third PPG signal carrying the deep blood vessel information.
As an alternative embodiment, fingerprint detection device 101 further comprises a processor (not shown in fig. 2) for acquiring a third PPG signal from the first PPG signal and the second PPG signal. Specifically, the processor is configured to obtain the third PPG signal by subtracting the first PPG signal and the second PPG signal, or the processor is configured to obtain the third PPG signal by normalizing the first PPG signal and the second PPG signal.
Further, the processor is further configured to obtain a blood pressure of the user according to the third PPG signal.
For application on wearable devices, to increase the frequency of daily blood pressure tests of hypertensive patients, smart watches made based on pulse transit time (Pulse Transit Time, PTT), pulse wave analysis (Pulse Wave Analysis, PWA) methods are presented on the market, and the blood pressure is indirectly obtained by calculating pulse wave transmission speed through Electrocardiogram (ECG) and PPG signals on the smart watch, or analyzing pulse wave waveforms. PTT refers to the time taken for an arterial pulse wave to reach the surrounding blood vessels from the aortic valve when the heart pumps blood, which has a positive correlation with blood pressure and thus can be used for blood pressure detection. PWA refers to the shape and amplitude of pulse wave, and the time and peak value of the dicrotic point, etc. information shows a certain correlation with the elasticity of blood vessels and blood pressure, so that the PWA can also be used for blood pressure detection. However, these methods are used to obtain blood pressure indirectly, so that the measurement accuracy is poor.
In the embodiment provided in the present application, the fingerprint detection device 101 is further configured to obtain the blood pressure of the user according to the third PPG signal and the pressing pressure of the finger of the user on the display screen 102, so as to improve the accuracy of blood pressure detection.
The pressing pressure contains the information of the pressure dimension, so that the accuracy of blood pressure detection can be improved. The blood pressure statistics of the crowd is 40 mmHg-200 mmHg, and 200mmHg can be used as a condition for judging the end of acquisition, and in addition, when the finger pressing pressure is higher than 200mmHg, the finger blood flow is blocked, the PPG signal disappears, so that the judgment can be also carried out according to the PPG signal amplitude. And when the PPG signal amplitude is lower than a certain set value, ending PPG signal acquisition.
As an alternative embodiment, the acquisition of the first PPG signal or the second PPG signal is ended when the compression pressure is equal to or higher than a third threshold. The third threshold is 200mmHg. Or ending the acquisition of the first PPG signal/the second PPG signal when the amplitude of the first PPG signal/the second PPG signal is smaller than a fourth threshold value.
The fingerprint detection device 102 may be configured to obtain a pressing pressure of a user finger on the display screen 102 according to a pressing area of the user finger on the display screen 102 and a pressing pressure of the user finger on the display screen 102, where the pressing area of the user finger on the display screen 102 is obtained by the fingerprint detection device 101 or the display screen 102.
As an alternative embodiment, referring to fig. 1 and 2, the electronic device 100 further comprises a pressure sensor 104, the pressure sensor 104 being arranged below the display screen 102 adjacent to the fingerprint detection device 101. The pressure sensor 104 is disposed adjacent to the fingerprint detection device 101, so that when the user finger 200 presses the display screen 102 to perform blood pressure detection, the pressure sensor 104 can be used to obtain the pressing pressure of the user finger 200 pressing the display screen 102 when the fingerprint detection device 101 obtains the PPG signal, and thus the pressing pressure of the user finger 200 during blood pressure detection can be further obtained according to the pressing area and the pressing pressure. The fingerprint detection device 101 can also obtain the pressing pressure of the user's finger pressing the display screen 102 through the pressure sensor 104 when obtaining the PPG signal, so that after further obtaining the pressing pressure, more accurate blood pressure can be obtained through the pressing pressure and the third PPG signal.
As an alternative embodiment, the fingerprint detection device 101 is further configured to obtain a pressing area of the user finger 200 on the display screen 102. When the user's finger 200 is pressed on the top of the fingerprint detection area of the display screen 102, the fingerprint detection device 101 is configured to receive the light signal that the light source irradiates the user's finger and passes through the display screen 102 after being reflected by the user's finger, so as to obtain the pressing area of the user's finger 200 on the display screen 102. When 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 finger 200 of the user and is reflected by the surface of the finger, and is received by the fingerprint detection device 101, so as to obtain the pressing area of the finger of the user on the display screen 102. For example, the display screen is an OLED display screen, the pixels corresponding to the fingerprint detection area emit light, and the pixels may include red, blue and green pixels, which can be used as excitation light sources for obtaining the pressing area.
As a specific embodiment, the fingerprint detection device receives the light signal reflected by the surface of the finger of the user to form a fingerprint image, and the fingerprint image is processed to obtain the pressing area of the finger 200 of the user on the display screen 102, where the light signal is emitted by the light source. In particular, the processor of the fingerprint detection device 101 may be configured to process the fingerprint image to obtain the pressing area.
As another alternative embodiment, the display 102 is used to obtain the pressed area of the user's finger 200 on the display 102. For example, the display screen is a touch integrated display screen with a touch function, and at this time, the pressing area of the user finger 200 on the display screen 102 can be obtained through the touch function. In this case, it is not necessary to form a fingerprint image by the fingerprint detection device 101 and acquire the pressing area, and the flow can be reduced and the blood pressure detection efficiency can be improved.
It will be appreciated that the pressure sensor 104 is capable of measuring the time-dependent value of the compression pressure and thus, by combining the compression area, is capable of obtaining the time-dependent value of the pressure.
In order to obtain a more accurate blood pressure of the user, optionally, the processor is further configured to sort the third PPG signals respectively acquired by the plurality of pixel units of the fingerprint detection device according to the intensity of the third PPG signals from large to small.
Optionally, the processor is further configured to reserve a signal with an arrangement sequence number less than or equal to a first threshold in the ordered third PPG signal, where the first threshold is a ratio of the arrangement sequence number of the third PPG signal to the number of the third PPG signals. For convenience of description, the third PPG signal with the sequence number less than or equal to the first threshold value in the third PPG signal after the retention ordering is referred to as a fourth PPG signal. For example, the first threshold may be 30%,25% or 20%. If the light source does not irradiate the deep blood vessel, the obtained third PPG signal is weak, so that in order to further improve the accuracy of blood pressure detection, the third PPG signal with the intensity less than the first threshold value according to the arrangement sequence of the intensity from large to small, namely, the third PPG signal with the larger intensity is reserved, and thus, a more accurate blood pressure value can be obtained through the screened third PPG signal with the larger intensity (namely, the fourth PPG signal). For example, if there are currently 400 third PPG signals, the 400 third PPG signals are ordered from big to small according to intensity, if the first threshold is 30%, then the third PPG signals before the permutation number 120 are reserved, that is, the third PPG signals with the permutation number of 1 to 120 are reserved, that is, the first 120 third PPG signals are reserved, and the 120 third PPG signals are recorded as the fourth PPG signal, it is understood that if the product of the number of third PPG signals and the first threshold is not an integer, it may be decided whether to reserve the current third PPG signal according to a rounding manner. Because the third PPG signals with the arrangement sequence being positioned at the back are weak, the third PPG signals with the arrangement sequence being larger than the first threshold value are discarded, so that the measurement of blood pressure is not influenced, and more accurate blood pressure values can be obtained.
Optionally, the processor is configured to obtain, according to the fourth PPG signal and the compression pressure, a compression pressure at a peak-to-peak maximum time of the fourth PPG signal, and obtain, according to the compression pressure at the peak-to-peak maximum time of the fourth PPG signal, a blood pressure of the user.
Optionally, the processor is configured to sort fourth PPG signals respectively acquired by the plurality of pixel units in the fingerprint detection device according to the compression pressure, so as to obtain a fourth PPG signal envelope. For example, the processor is configured to sort fourth PPG signals respectively acquired by the plurality of pixel units from large to small according to the compression pressure.
Optionally, the processor is further configured to reserve the fourth PPG signal with an arrangement sequence number less than or equal to a second threshold in the ordered fourth PPG signal (fourth PPG signal envelope), where the second threshold is a ratio of the arrangement sequence number of the fourth PPG signal to the number of the fourth PPG signals. For convenience of description, a signal with an order number less than or equal to the second threshold value in the fourth PPG signal (fourth PPG signal envelope) after the retention ordering is referred to herein as a fifth PPG signal. For example, the second threshold may be 30%,25% or 20%. The larger the pressure corresponding to the fourth PPG signal envelope peak value is, the more deep aortic signals are obtained by the pixel unit. Therefore, further screening out the fourth PPG signal smaller than or equal to the second threshold value can further improve the accuracy of blood pressure detection. For example, if there are 120 fourth PPG signals currently, the 120 fourth PPG signals are sorted from large to small according to the compression pressure, so as to obtain the fourth PPG signal envelope, if the second threshold is 30%, the fourth PPG signals before the permutation number 36 are reserved, that is, the first 36 fourth PPG signals are reserved, and it is understood that if the product of the number of fourth PPG signals and the second threshold is not an integer, whether the current fourth PPG signal is reserved may be determined according to the rounding manner. Because the information carried by the fourth PPG signal with the arrangement sequence being positioned in front is more close to the aorta in the body, the fourth PPG signal with the arrangement sequence being larger than the second threshold value is discarded, so that the measurement of blood pressure is not influenced, and a more accurate blood pressure value can be obtained.
In addition, if the position deviates from the isolated pixel unit with larger position, the signal interference, such as the activity of the sympathetic nerve, can be directly discarded, so that the fifth PPG signal acquired by the isolated pixel unit corresponding to the adjacent pixel unit in the fingerprint detection device can be discarded or eliminated. For convenience of description, after discarding or rejecting the fifth PPG signal corresponding to the isolated pixel unit, the remaining fifth PPG signal is denoted as the sixth PPG signal. Since the palmar transverse arch artery is a blood vessel with a band-like distribution and has a certain width, the fifth PPG signal, that is, the pixel unit corresponding to the sixth PPG signal, which is reserved in the previous step should be band-like. So far, the preserved pixel unit corresponding to the sixth PPG signal is consistent with the trend of the palmar transverse arch artery, namely the PPG signal of the palmar transverse arch artery and the envelope thereof are obtained, and the PPG signal obtained by the pixel unit of the part is used for calculating the blood pressure, so that the blood pressure is closer to the blood pressure of the main artery in the body. Further analysis may be performed according to a sixth PPG signal envelope formed by the retained sixth PPG signal, so as to obtain an average arterial pressure of the user, and then the blood pressure value may be calculated according to a coefficient method or a two-gaussian fitting method. The mean arterial pressure may be a pressure corresponding to a sixth PPG signal envelope peak.
Fig. 4 is a schematic view of a finger 200, the finger 200 including the transverse arch 201, which can be seen in fig. 2. The blood pressure value of the palmar-transverse arch artery of the finger is closer to the blood pressure value of the large artery in the body than other small arteries, the thickness of the palmar-transverse arch artery is 0.85±0.1mm, the length is close to the width of the finger, and since the palmar-transverse arch artery is located near the fingerprint center position of the finger, in order to acquire a more accurate blood pressure value, the fingerprint detection device 101 determines whether the pressing area of the finger contains the fingerprint center after acquiring the fingerprint image, if the finger pressing position is deviated, for example, the fingertip pressing or the edge pressing, the acquired fingerprint image does not include the fingerprint center at this time, and the pressing position does not include the palmar-transverse arch artery of the finger, so that the accurate blood pressure value cannot be acquired when the blood pressure detection is performed. Specifically, it may be determined by the processor of the fingerprint detection device 101 whether the fingerprint image contains a fingerprint center. Referring to fig. 4, it is possible to confirm whether the current fingerprint image includes a fingerprint center using a tangent method. Specifically, two non-parallel fingerprint lines can be found at will on the fingerprint image, and tangential lines are respectively made to the two fingerprint lines, if the focuses of the two normals are located in the fingerprint image, the pressing area representing the finger contains the fingerprint center, and if the focuses of the two normals are located outside the fingerprint image, the pressing area representing the finger does not contain the fingerprint center.
As an alternative embodiment, if it is determined that the pressed area of the finger does not include the fingerprint center, the blood pressure detection is ended, and the user may be prompted to press again until it is determined that the pressed area of the finger includes the fingerprint center.
As an alternative embodiment, if it is determined that the pressed area of the finger includes the fingerprint center, the blood pressure detection is continued. It may be seen from the foregoing that the first and second light sources are illuminated by the first and second light sources, and the first and second PPG signals are obtained by the fingerprint detection device 101. Optionally, only the luminous pixels with the fingerprint center in the rectangular range with the front projection of the display screen as the center, the width of R and the length of S may be turned on to further reduce the power consumption during the blood pressure detection, where the width direction is the direction along the length of the finger, and the length direction is the direction of the width of the finger, and referring to the rectangle 202 shown in fig. 3, according to the lighting area shown by the rectangle 202, the palm transverse arch artery near the fingerprint center may be fully irradiated, and considering that the palm transverse arch artery position dispersion of different people is within the range of ±1mm in the fingerprint center, optionally, 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, so that the luminous pixels may be irradiated to the area where the palm transverse arch artery is located, and the power consumption during the blood pressure detection by the electronic device may be reduced.
In the embodiment of the application, the blood pressure detection may be performed by the processor, for example, the processor may perform various signal processing of the blood pressure detection.
The embodiment of the application also provides electronic equipment, which comprises a display screen and a fingerprint detection device, wherein the fingerprint detection device is arranged below the display screen and used for blood pressure detection. Specifically, the fingerprint detection device may be disposed below a fingerprint detection area of the display screen, and is configured to obtain fingerprint information of a finger or blood pressure information of a user.
The electronic equipment further comprises a pressure sensor, and the pressure sensor and the fingerprint detection device are adjacently arranged below the display screen. The pressure sensor is arranged adjacent to the fingerprint detection device, so that the user can press the finger to perform blood pressure detection on the display screen, and the pressure sensor can be used for acquiring the pressing pressure of the user pressing the display screen when the fingerprint detection device acquires the PPG signal, so that more accurate blood pressure is acquired. The electronic equipment can be mobile electronic equipment such as a mobile phone, a tablet personal computer and the like.
The electronic device may further include a light source, and the relevant content of the electronic device will refer to the relevant content of fig. 1 and 2, which are not described herein.
Fig. 5 shows a blood pressure detection method according to an embodiment of the present application, where the blood pressure detection method includes:
s501, at a first moment, the fingerprint detection device receives a first optical signal reflected by a finger of a user and passing through a display screen, wherein the first optical signal is an optical signal with a first wavelength emitted by a first light source, and the first optical signal is used for acquiring a first PPG signal;
s502, at a second moment, the fingerprint detection device receives a second optical signal reflected by a finger of a user and passing through the display screen, wherein the second optical signal is an optical signal with a second wavelength emitted by the second light source, and the second optical signal is used for acquiring a second PPG signal;
s503, acquiring a third PPG signal according to the first PPG signal and the second PPG signal, wherein the third PPG signal is used for acquiring blood pressure of a user, and the first wavelength is different from the second wavelength.
The blood pressure detection method is suitable for the fingerprint detection device shown in fig. 1 and 2 or the electronic equipment, and the fingerprint detection device is used for detecting blood pressure besides the detection function, so that the blood pressure detection device is not required to be additionally arranged, and the cost of the electronic equipment can be greatly reduced. The relevant content may be described with reference to fig. 1 to 4, and will not be described in detail here.
The user may be guided to place a finger in the fingerprint detection area of the display screen before starting the blood pressure detection. The fingerprint detection device may be disposed below a fingerprint detection area of the display screen, and used for acquiring fingerprint information of a finger or blood pressure information of a user.
According to the blood pressure detection method, the under-screen fingerprint detection device is used for acquiring the PPG signal, so that the blood pressure of a user is further acquired, and the electronic equipment carrying the under-screen fingerprint detection device is small in size and convenient to carry, so that the user can conveniently perform all-weather blood pressure detection. In addition, at least two light sources with different wavelengths are utilized to obtain PPG signals with different wavelengths, and the PPG signals which are closer to the deep blood vessel are further obtained through the PPG signals with the different wavelengths, so that the finally obtained blood pressure is closer to a true value.
The display screen in this embodiment can be the self-luminous display screen, for example OLED display screen, and first light source and second light source can be the luminescent pixel of display screen, and at this moment, can directly utilize the luminescent pixel of display screen as blood pressure detection or fingerprint detection's excitation light source, need not additionally to increase the light source, can reduce cost, and in addition, utilize the luminescent pixel of display screen as excitation light source, it is more even to give out light, can obtain more accurate blood pressure value or make fingerprint detection result more accurate. The luminous pixels of the OLED display screen comprise red, blue and green luminous pixels and can be used as excitation light sources for blood pressure detection or fingerprint detection. When blood pressure detection is carried out, different light sources can be used for carrying out time sharing lighting, as described above, light sources with different wavelengths can be adopted for lighting at the first moment and the second moment, the fingerprint detection device receives light signals sent by corresponding light sources at the first moment and the second moment, and the PPG signals which are closer to deep blood vessels can be further obtained by adopting the light sources with different wavelengths for time sharing lighting, so that the finally obtained blood pressure is closer to a true value. When fingerprint detection is carried out, only a light source with a certain color or a certain wavelength can be adopted for polishing, and light sources with various colors or various wavelengths can be adopted for polishing simultaneously. It can be appreciated that when the fingerprint detection device is applied to an electronic device having a non-self-luminous display screen, the light source may be additionally disposed, and the light source may be disposed below the display screen or disposed side by side with the display screen. It will be appreciated that light sources of different colours will emit light of different wavelengths.
Optionally, the first light source is a red light source, and the second light source is a blue light source or a green light source. Because the red light has strong penetrating power, the red light can reach deep blood vessels, in other words, when the red light is reflected by fingers and reaches the fingerprint detection device or reaches the pixel unit array of the fingerprint detection device, the red light simultaneously carries the information of the deep blood vessels and the shallow blood vessels, so that the red light can be utilized to simultaneously capture PPG signals of the deep blood vessels and the shallow blood vessels. The green light or blue light has weak penetration capability and can only reach shallow blood vessels, such as epidermal capillaries, in other words, when the green light or blue light is reflected by a finger and reaches the fingerprint detection device, or reaches the pixel unit array of the fingerprint detection device, the green light or blue light only carries the information of the shallow blood vessels, so that only the PPG signal of the shallow blood vessels can be acquired by using the green light or blue light, and therefore, the PPG signal of the deep blood vessels, namely the third PPG signal, can be acquired through calculation of the first PPG signal and the second PPG signal.
The "obtaining a third PPG signal from the first PPG signal and the second PPG signal" in S503 includes: obtaining the third PPG signal by performing difference on the first PPG signal and the second PPG signal; or normalizing the first PPG signal and the second PPG signal to obtain the third PPG signal.
Referring to fig. 6, the blood pressure detection method further includes:
s504: and acquiring the pressing pressure of the finger of the user pressing the display screen, and acquiring the blood pressure of the user according to the third PPG signal and the pressing pressure.
The pressing pressure contains the information of the pressure dimension, so that the accuracy of blood pressure detection can be improved. The blood pressure statistics of the crowd is 40 mmHg-200 mmHg, and 200mmHg can be used as a condition for judging the end of acquisition, and in addition, when the finger pressing pressure is higher than 200mmHg, the finger blood flow is blocked, the PPG signal disappears, so that the judgment can be also carried out according to the PPG signal amplitude. And when the PPG signal amplitude is lower than a certain set value, ending PPG signal acquisition.
As an alternative embodiment, the acquisition of the first PPG signal or the second PPG signal is ended when the compression pressure is equal to or higher than a third threshold. The third threshold is 200mmHg. Or ending the acquisition of the first PPG signal/the second PPG signal when the amplitude of the first PPG signal/the second PPG signal is smaller than a fourth threshold value.
Referring to fig. 7, in the blood pressure detection method S504, the "obtaining the pressing pressure of the user' S finger pressing the display screen" includes:
S5041: and obtaining the pressing pressure of the user finger on the display screen according to the pressing area of the user finger on the display screen and the pressing pressure of the user finger on the display screen, wherein the pressing area of the user finger on the display screen is obtained through the fingerprint detection device or the display screen.
Alternatively, the pressing pressure of the finger of the user on the display screen may be obtained through a pressure sensor, and the pressure sensor may be disposed adjacent to the fingerprint detection device below the display screen. When blood pressure is detected, the fingerprint detection device can also obtain the pressing pressure of the user finger pressing the display screen through the pressure sensor when the PPG signal is obtained, so that more accurate blood pressure can be obtained through the pressing pressure and the third PPG signal after the pressing pressure is further obtained.
Optionally, the pressing area of the user finger on the display screen may be obtained through the fingerprint detection device. When the finger of the user is pressed above the fingerprint detection area of the display screen, the fingerprint detection device is used for receiving the light signal which is irradiated to the finger of the user by the light source and passes through the display screen after being reflected by the finger of the user, and then the pressing area of the finger of the user on the display screen can be obtained. When the light source is a light emitting pixel of the display screen, the light signal emitted by the light emitting pixel irradiates the finger of the user and is reflected by the surface of the finger, and after being received by the fingerprint detection device, the pressing area of the finger of the user on the display screen is obtained. For example, the display screen is an OLED display screen, the pixels corresponding to the fingerprint detection area emit light, and the pixels may include red, blue and green pixels, which can be used as excitation light sources for obtaining the pressing area.
As a specific embodiment, the fingerprint detection device receives the light signal reflected by the surface of the finger of the user to form a fingerprint image, and the fingerprint image can be processed to obtain the pressing area of the finger of the user pressed on the display screen, and the light signal is emitted by the light source. Specifically, the processor of the fingerprint detection device may be configured to process the fingerprint image to obtain the pressing area.
The blood pressure value of the palmar transverse arch artery of the finger is closer to the blood pressure value of the main artery in the body than other micro arteries, the thickness of the palmar transverse arch artery is 0.85+/-0.1 mm, the length is close to the width of the finger, and the method for detecting the blood pressure comprises the following steps of:
the fingerprint detection device forms a fingerprint image according to the received optical signals reflected by the surface of the finger of the user;
judging whether a pressing area of a user finger contains a fingerprint center or not according to the fingerprint image;
if the pressing area of the finger of the user is judged not to contain the fingerprint center, ending the blood pressure detection;
If the pressed area of the finger is judged to contain the fingerprint center, the blood pressure detection is continued.
As an alternative embodiment, if it is determined that the pressed area of the user's finger does not include the fingerprint center, the user may be prompted to press again until it is determined that the pressed area of the user's finger includes the fingerprint center.
It will be appreciated that if the finger pressing position is offset, such as a fingertip press or a finger edge press, the fingerprint image obtained at this time does not include the center of the fingerprint, and such a pressing position does not include the transverse arch artery of the finger, so that an accurate blood pressure value cannot be obtained when performing blood pressure detection.
The step of judging whether the pressing area of the finger of the user contains the fingerprint center according to the fingerprint image comprises the following steps: and judging whether the pressing area of the finger of the user contains the fingerprint center by adopting a tangent method. Specifically, two non-parallel fingerprint lines can be found at will on the fingerprint image, and tangential lines are respectively made to the two fingerprint lines, if the focal points of the two normals are located in the fingerprint image, the pressing area representing the finger of the user contains the fingerprint center, and if the focal points of the two normals are located outside the fingerprint image, the pressing area representing the finger does not contain the fingerprint center.
As an alternative embodiment, if it is determined that the pressed area of the finger includes the fingerprint center, the blood pressure detection is continued. Referring to the foregoing, the first light source and the second light source are used for shining, and the fingerprint detection device obtains the first PPG signal and the second PPG signal. Optionally, only the luminous pixels with the fingerprint center in the rectangular range with the front projection of the display screen as the center, the width R and the length S can be lightened, so that the power consumption in the blood pressure detection can be further reduced, wherein the width direction is the direction along the length of the finger, the length direction is the direction of the width of the finger, the rectangle 202 shown in fig. 3 can be referred to, the luminous area shown by the rectangle 202 can be fully irradiated to the palm transverse arch artery near the fingerprint center, and considering that the position dispersion of the palm transverse arch artery of different people is in the range of +/-1 mm in the fingerprint center, the luminous pixels can be optionally provided with R being less than or equal to 3mm, and S being more than or equal to the width of the finger, for example, S being more than or equal to 8mm, so that the luminous pixels can be irradiated to the area where the palm transverse arch artery is located, and the power consumption in the blood pressure detection can be reduced.
As another alternative embodiment, the display screen is used for acquiring the pressing area of the finger of the user on the display screen. For example, the display screen is a touch integrated display screen with a touch function, and at this time, the pressing area of the user finger on the display screen can be obtained through the touch function. In this case, the fingerprint image is not required to be formed by the fingerprint detection device, and the pressing area is acquired, so that the flow can be reduced, and the blood pressure detection efficiency can be improved.
It will be appreciated that the pressure sensor is capable of measuring the time-dependent value of the compression pressure and thus by combining the compression area the time-dependent value of the pressure can be obtained.
In order to obtain a more accurate blood pressure of the user, the "obtain the blood pressure of the user from the third PPG signal and the compression pressure". "comprising:
s5042: and sequencing third PPG signals respectively acquired by a plurality of pixel units in the fingerprint detection device according to the intensity of the third PPG signals, and reserving signals with sequence numbers smaller than or equal to a first threshold value in the sequenced third PPG signals, wherein the first threshold value is a ratio of the sequence numbers of the third PPG signals to the number of the third PPG signals, and the third PPG signals with sequence numbers smaller than or equal to the first threshold value are fourth PPG signals.
The first threshold may be 30%,25% or 20%. If the light source does not irradiate the deep blood vessel, the obtained third PPG signal is weak, so that in order to further improve the accuracy of blood pressure detection, the third PPG signal with the intensity less than the first threshold value according to the arrangement sequence of the intensity from large to small, namely, the third PPG signal with the larger intensity is reserved, and thus, a more accurate blood pressure value can be obtained through the screened third PPG signal with the larger intensity (namely, the fourth PPG signal). Because the third PPG signals with the arrangement sequence being positioned at the back are weak, the third PPG signals with the arrangement sequence being larger than the first threshold value are discarded, so that the measurement of blood pressure is not influenced, and more accurate blood pressure values can be obtained. Reference is specifically made to the examples listed in the foregoing and will not be described in detail here.
S504 further includes:
s5043: and acquiring the compression pressure at the peak-to-peak maximum moment of the fourth PPG signal according to the fourth PPG signal and the compression pressure.
And obtaining the blood pressure of the user according to the pressing pressure at the moment of maximum peak-to-peak value of the fourth PPG signal.
Referring to fig. 8, S504 may further include:
s5044: and sequencing fourth PPG signals respectively acquired by a 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 reserving signals with arrangement sequence numbers smaller than or equal to a second threshold value in the fourth PPG signal envelope, wherein the second threshold value is a ratio of the arrangement sequence numbers of the fourth PPG signals to the number of the fourth PPG signals, and the fourth PPG signals with the arrangement sequence numbers smaller than or equal to the second threshold value are fifth PPG signals.
Alternatively, the second threshold may be 30%,25% or 20%. The larger the pressure corresponding to the fourth PPG signal envelope peak value is, the more deep aortic signals are obtained by the pixel unit. Therefore, further screening out the fourth PPG signal smaller than or equal to the second threshold value can further improve the accuracy of blood pressure detection. Because the information carried by the fourth PPG signal with the arrangement sequence being positioned in front is more close to the aorta in the body, the fourth PPG signal with the arrangement sequence being larger than the second threshold value is discarded, so that the measurement of blood pressure is not influenced, and a more accurate blood pressure value can be obtained. Reference is specifically made to the examples listed in the foregoing and will not be described in detail here.
Furthermore, if the position deviates from a large isolated pixel unit, possibly a signal disturbance, such as the activity of a sympathetic nerve, the fifth PPG signal acquired by the isolated pixel unit in the fingerprint detection device corresponding to the fourth PPG signal acquired by the adjacent pixel unit can be directly discarded or eliminated.
S504 further includes:
s5035: discarding the fifth PPG signal obtained by the isolated pixel unit in the fingerprint detection device, where the isolated pixel unit refers to the fourth PPG signal obtained by the pixel unit adjacent to the isolated pixel unit, and the fifth PPG signal remaining after discarding the fifth PPG signal obtained by the isolated pixel unit is the sixth PPG signal.
Since the transverse arch artery is a blood vessel with a band-like distribution and has a certain width, the fifth PPG signal, i.e. the pixel elements corresponding to the sixth PPG signal, which is retained in this step should be band-like. So far, the preserved pixel unit corresponding to the sixth PPG signal is consistent with the trend of the palmar transverse arch artery, namely the PPG signal of the palmar transverse arch artery and the envelope thereof are obtained, and the PPG signal obtained by the pixel unit of the part is used for calculating the blood pressure, so that the blood pressure is closer to the blood pressure of the main artery in the body.
S5036: and acquiring the blood pressure of the user according to the sixth PPG signal and the pressing pressure.
Specifically, the mean arterial pressure of the user may be obtained according to a sixth PPG signal envelope formed by the sixth PPG signal, then the blood pressure of the user may be obtained according to the mean arterial pressure, specifically, the blood pressure value may be calculated according to a coefficient method or a double gaussian fitting method, and the method for calculating the blood pressure value is not limited in this embodiment of the present application, as long as the blood pressure of the user can be calculated. The mean arterial pressure may be a pressure corresponding to a sixth PPG signal envelope peak.
It should be appreciated that the processing unit or processor of embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may 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 programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. It will be appreciated that the blood pressure detection device of embodiments of the present application may also include a memory unit or memory, which may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application may be embodied in essence or a part contributing to the prior art or a part of the technical solutions, or in the form of a software product, which is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (15)
1. The fingerprint detection device is characterized by being suitable for electronic equipment with a display screen, wherein the fingerprint detection device is arranged below the display screen and used for blood pressure detection, the electronic equipment comprises a light source, the light source comprises a first light source and a second light source, the fingerprint detection device is used for receiving a first optical signal reflected by a finger of a user and penetrating through the display screen at a first moment, and the first optical signal is an optical signal with a first wavelength emitted by the first light source;
the fingerprint detection device is used for receiving a second optical signal reflected by a finger of a user and passing through the display screen at a second moment, wherein the second optical signal is an optical signal with a second wavelength emitted by the second light source;
the first wavelength is different from the second wavelength, the first optical signal is used for acquiring a first PPG signal, the second optical signal is used for acquiring a second PPG signal, and the first PPG signal and the second PPG signal are used for acquiring a third PPG signal;
The fingerprint detection device is configured to sort third PPG signals obtained by a plurality of pixel units in the fingerprint detection device from large to small according to the intensity of the third PPG signals, and reserve a signal with an arrangement sequence number smaller than or equal to a first threshold value in the sorted third PPG signals, where the first threshold value is a ratio of the arrangement sequence number of the third PPG signals to the number of the third PPG signals, and the third PPG signal with the arrangement sequence number smaller than or equal to the first threshold value is a fourth PPG signal;
the fingerprint detection device is used for acquiring the blood pressure of the user according to the third PPG signal and the pressing pressure of the user finger on the display screen;
the fingerprint detection device is configured to sort the fourth PPG signals respectively acquired by the plurality of pixel units in the fingerprint detection device from large to small according to the compression pressure, to obtain a fourth PPG signal envelope, and to preserve a signal with an arrangement sequence number smaller than or equal to a second threshold value in the fourth PPG signal envelope, where the second threshold value is a ratio of the arrangement sequence number of the fourth PPG signal to the number of the fourth PPG signals, and the fourth PPG signal with the arrangement sequence number smaller than or equal to the second threshold value is a fifth PPG signal, where the fifth PPG signal is used to acquire blood pressure of a user.
2. The fingerprint detection device according to claim 1 wherein said display screen is an OLED display screen and said light source is a light emitting pixel of said OLED display screen.
3. The fingerprint detection device according to claim 2 wherein said first light source is a red light emitting pixel and said second light source is a blue light emitting pixel or a green light emitting pixel.
4. Fingerprint detection device according to claim 1, wherein the fingerprint detection device is adapted to obtain the third PPG signal by differencing the first PPG signal and the second PPG signal; or alternatively
The fingerprint detection device is configured to obtain the third PPG signal by normalizing the first PPG signal and the second PPG signal.
5. The fingerprint detection device according to claim 1, wherein the fingerprint detection device is configured to obtain a pressing pressure of a user finger on the display screen according to a pressing area of the user finger on the display screen and a pressing pressure of the user finger on the display screen, wherein the pressing area of the user finger on the display screen is obtained by the fingerprint detection device or the display screen.
6. The fingerprint detection device according to claim 5 wherein said fingerprint detection device is adapted to receive a light signal reflected from a surface of a user's finger to form a fingerprint image, said fingerprint image being adapted to capture a pressing area of the user's finger against said display screen, said light signal being emitted by said light source.
7. The fingerprint detection device according to claim 1 wherein said first threshold is 30%,25% or 20%.
8. Fingerprint detection device according to claim 1, wherein the fingerprint detection device is adapted to obtain a compression pressure at a peak-to-peak instant of the fourth PPG signal from the fourth PPG signal and the compression pressure.
9. The fingerprint detection device according to claim 1 wherein said second threshold is 30%,25% or 20%.
10. Fingerprint detection device according to claim 1, wherein the fingerprint detection device is further configured to discard the fifth PPG signal acquired by an isolated pixel unit in the fingerprint detection device, the isolated pixel unit being discarded in relation to a fourth PPG signal acquired by a pixel unit adjacent thereto, wherein after discarding the fifth PPG signal acquired by the isolated pixel unit, the remaining fifth PPG signal is a sixth PPG signal, the sixth PPG signal being used for acquiring the blood pressure of the user.
11. The fingerprint detection device according to claim 6, wherein the fingerprint detection device is configured to determine whether the pressed area of the user's finger includes a fingerprint center based on the fingerprint image, and if it is determined that the pressed area of the user's finger does not include a fingerprint center, end the blood pressure detection.
12. The fingerprint detection device according to claim 1, wherein the fingerprint detection device comprises a processor configured to perform the blood pressure detection.
13. An electronic device, comprising:
a display screen, a fingerprint detection device according to any of claims 1 to 12 wherein said fingerprint detection device is arranged below said display screen for blood pressure detection.
14. The electronic device of claim 13, further comprising a pressure sensor disposed below the display screen adjacent to the fingerprint detection device.
15. The electronic device of claim 13, further comprising a light source, wherein the display screen is an OLED display screen, and wherein the light source is a light emitting pixel of the OLED display screen.
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