CN113100726A

CN113100726A - Blood pressure detection device and electronic equipment

Info

Publication number: CN113100726A
Application number: CN202110302919.6A
Authority: CN
Inventors: 陈艺章
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-07-13

Abstract

The application discloses blood pressure detection device for carry out blood pressure detection to external object, including detecting light source, pressure sensor, light receiver and processing module. The detection light source is used for emitting detection light to irradiate the finger of the user. The pressure sensor is used to detect a touch pressure of an external object. The optical receiver is used for receiving light returned by the external object and converting the received light into a PPG signal of the external object. The processing module is used for fitting a curve of PPG signal amplitude changing along with the touch pressure according to the acquired touch pressure and the PPG signal amplitude, taking a plurality of groups of actual arm blood pressure values measured by the pressurizing cuff type mercury sphygmomanometer as reference, obtaining an empirical formula for calculating arm blood pressure information according to characteristic parameters of a curve graph of the PPG signal changing along with the touch pressure by adopting a stepwise regression method, and then calculating the arm blood pressure information of an external object according to the obtained empirical formula. The application also discloses an electronic device comprising the blood pressure detection device.

Description

Blood pressure detection device and electronic equipment

Technical Field

The present application relates to the field of blood pressure monitoring technologies, and in particular, to a blood pressure monitoring device and an electronic apparatus that use an optoelectronic device to monitor the blood pressure of an external object.

Background

Currently, a common blood pressure measuring device is a pressurized cuff-type mercury sphygmomanometer based on an auscultation method. However, the auscultation method requires a professional doctor to interpret the blood pressure according to the blood flow sound of brachial artery, and the pressurized cuff-type mercury sphygmomanometer is not portable and cannot meet the requirement of continuous blood pressure detection. Therefore, the blood pressure detection device which is free of the sleeve, convenient to carry and capable of continuously measuring has a wide application prospect and market value.

Disclosure of Invention

In view of the above, the present invention provides a blood pressure detecting device and an electronic apparatus capable of solving the problems of the prior art.

One aspect of the present application provides a blood pressure detecting apparatus for detecting blood pressure of an external subject, including:

the detection light source is used for emitting detection light to irradiate the finger of the user;

a pressure sensor for detecting a touch pressure of an external object;

a light receiver for receiving light returned via an external subject and converting the received light into a PPG signal of the external subject; and

the processing module is used for fitting a curve of PPG signal amplitude changing along with the touch pressure according to the acquired touch pressure and the PPG signal amplitude, taking a plurality of groups of actual arm blood pressure values measured by the pressurizing cuff type mercury sphygmomanometer as reference, obtaining an empirical formula capable of calculating arm blood pressure information according to characteristic parameters of a curve graph of the PPG signal changing along with the touch pressure by adopting a stepwise regression method, and then calculating arm blood pressure information of an external object according to the obtained empirical formula.

In some embodiments, the processing module fits the acquired touch pressure and PPG signal amplitude using two half-gaussian functions to obtain an equation for a curve of PPG signal amplitude versus touch pressure:

wherein H2 is the initial value of the amplitude of the PPG signal, H1 and F1 are the maximum value of the amplitude of the PPG signal and the corresponding touch pressure, respectively, and F2 is x<Width of half Gaussian function of segment F1, F3 being x>The width of the half-gaussian function of segment F1.

In some embodiments, the characteristic parameters of the PPG signal amplitude versus touch pressure graph are H1, H2, F1, F2, and the empirical formula for calculating the arm blood pressure information is:

the diastolic pressure of the arm is K1 & F1+ K2 & H1/H2 & F2+ K3;

the average blood pressure of the arm is K4 & F1+ K5 & H1/H2 & F2+ K6;

arm systolic pressure K7, arm mean blood pressure K8, arm diastolic pressure

Wherein K1, K2, K3, K4, K5, K6, K7 and K8 are empirical coefficients whose values depend on a plurality of sets of said actual arm blood pressure values of significant statistical significance and on correlation coefficients in a regression model.

In some embodiments, the touch pressure range selected by the blood pressure detection analysis is 40mmhg to a preset touch pressure final value FT, the PPG signal amplitude value at the touch pressure of 40mmhg is labeled H40, the PPG signal amplitude value at the touch pressure final value FT is labeled HT, H40 and HT are end parameters of a PPG signal amplitude-versus-touch pressure change curve, and characteristic parameters and end parameters of the PPG signal amplitude-versus-touch pressure change curve need to satisfy the following relationships:

0<F2<100mmHg，0<F3<100mmHg；

HT<0.5H1,H40<0.8H1；0<H2<H1

when the blood pressure is detected, if the characteristic parameter and the end value parameter of the PPG signal amplitude changing curve along with the touch pressure do not satisfy the relationship according to the obtained data, the blood pressure detection device does not output the blood pressure value but prompts the user to measure again.

In certain embodiments, further comprising:

the display screen comprises a display surface, and the display screen emits visible light through the display surface to display a picture;

the touch screen is attached to the display surface so as to transmit visible light emitted by the display screen, and the pressure sensor is arranged on the touch screen; and

and the control module is used for controlling the display screen to serve as the detection light source to emit detection light to irradiate the external object when the blood pressure is detected.

In some embodiments, the light receiver is disposed below the display screen to receive light returned by an external object through the touch screen and the display screen; or

The light receiver is integrated in the display screen to receive light returned by an external object through the touch screen and a part of the display screen.

In certain embodiments, further comprising:

the blood pressure sensor comprises a touch substrate, a pressure sensor and a control circuit, wherein the touch substrate is used for being in contact with an external object during blood pressure detection, and the pressure sensor is arranged on the touch substrate;

the detection light source is arranged below the touch substrate to emit detection light to irradiate the external object through the touch substrate, and the light receiver is arranged below the touch substrate to receive the light returned by the external object through the touch substrate.

An electronic device comprises the blood pressure detection device according to the embodiment, the electronic device is a mobile phone, and the blood pressure detection device is an off-screen/in-screen blood pressure detection device arranged inside the mobile phone.

An electronic device comprises the blood pressure detection device according to the embodiment.

In some embodiments, the main body of the electronic device includes a front surface, a back surface, and side edges, the front surface and the back surface are sequentially disposed opposite to each other along a thickness direction of the electronic device, the side edges are respectively connected to the front surface and the back surface, the side edges are provided with mounting holes, the blood pressure detection device is a side edge type blood pressure detection device, and the side edge type blood pressure detection device is disposed on the side edge of the main body through the mounting holes.

In some embodiments, the electronic device is a watch, the watch includes an upper cover plate, a middle frame, and a lower cover plate, the upper cover plate and the lower cover plate are respectively assembled on two opposite sides of the middle frame, the upper cover plate is a side facing a user for viewing after the watch is worn, the lower cover plate is a side contacting with skin of the user after the watch is worn, the lower cover plate is a touch substrate of the blood pressure detection device, the detection light source emits detection light through the touch substrate to irradiate a body part of the user contacting with the touch substrate, and the light receiver receives light returning through the body of the user through the touch substrate to detect PPG signals of the user.

The beneficial effects of the application lie in that, the blood pressure detection device of the application makes full use of the hardware of the portable electronic equipment to conveniently and effectively create the detection conditions, and the continuous detection of the arm blood pressure of the user can be realized without pressurizing the oversleeve.

Drawings

Fig. 1 is a schematic structural diagram of a blood pressure detecting device applied to an electronic device according to an embodiment of the present application;

FIG. 2 is a functional block diagram of the blood pressure monitor of FIG. 1;

fig. 3 is a functional structure diagram of a blood pressure detecting device according to another embodiment of the present application;

FIG. 4 is a perspective view of a portion of the electronic device shown in FIG. 1 at an overhead angle;

FIG. 5 is a schematic structural diagram of a blood pressure monitor according to another embodiment of the present application;

FIG. 6 is a schematic structural diagram of a blood pressure monitor according to another embodiment of the present application;

FIG. 7 is a schematic structural diagram of a blood pressure monitor according to another embodiment of the present application;

fig. 8 is a schematic waveform diagram of a finger PPG signal detected by the blood pressure detection device in fig. 1 oscillating with the heart beat period;

fig. 9 is a schematic diagram of the variation of finger PPG signal detected by the blood pressure detection device in fig. 1 with touch pressure;

fig. 10 is a graph of finger PPG signal amplitude versus touch pressure detected by the blood pressure detection device in fig. 1.

FIG. 11 is a diagram of the blood pressure monitor of FIG. 1 for guiding the touch pressure applied by the user during the detection

Fig. 12 is a schematic structural diagram of a blood pressure detecting device according to another embodiment of the present application.

Fig. 13 is a schematic structural diagram of a blood pressure detecting device applied to an electronic device according to another embodiment of the present application;

fig. 14 is a schematic perspective view of the blood pressure detecting device shown in fig. 13.

FIG. 15 is a perspective view of a portion of the blood pressure monitor shown in FIG. 14 at an overhead angle;

FIG. 16 is a partial cross-sectional view of the blood pressure monitor of FIG. 14 taken along line XV-XV;

fig. 17 is a schematic structural diagram of a blood pressure detecting device according to another embodiment of the present application.

Fig. 18 is a schematic structural diagram of a blood pressure detecting device according to another embodiment of the present application.

FIG. 19 is a schematic structural diagram of a blood pressure monitor according to another embodiment of the present application applied to an electronic device;

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

In the detailed description of the embodiments herein, it will be understood that when a substrate, a sheet, a layer, or a pattern is referred to as being "on" or "under" another substrate, another sheet, another layer, or another pattern, it can be "directly" or "indirectly" on the other substrate, the other sheet, the other layer, or the other pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented for clarity. Further, the sizes of the elements in the drawings do not completely reflect actual sizes.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. To simplify the disclosure of the present application, the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the application.

One embodiment of the present application provides a blood pressure detection device for performing blood pressure detection on an external subject. The blood pressure detection device comprises a detection light source, a pressure sensor, a light receiver and a processing module. The detection light source is used for emitting detection light to irradiate the finger of the user. The pressure sensor is used for detecting the touch pressure of an external object. The light receiver is used for receiving light returned by the external object and converting the received light into a PPG signal of the external object. The processing module is used for fitting a curve of PPG signal amplitude changing along with the touch pressure according to the acquired touch pressure and the PPG signal amplitude, taking a plurality of groups of actual arm blood pressure values measured by the pressurizing cuff type mercury sphygmomanometer as reference, obtaining an empirical formula capable of calculating arm blood pressure information according to characteristic parameters of a curve graph of the PPG signal changing along with the touch pressure by adopting a stepwise regression method, and then calculating arm blood pressure information of an external object according to the obtained empirical formula.

The blood pressure detection device also comprises a display screen which comprises a display surface. The display screen emits visible light through the display surface to display a picture; the touch screen is attached to the display surface so as to transmit visible light emitted by the display screen, and the pressure sensor is arranged on the touch screen; and the control module is used for controlling the display screen to serve as the detection light source to emit detection light to irradiate the external object when the blood pressure is detected.

The blood pressure detection device further comprises a touch substrate which is used for contacting with an external object during blood pressure detection. The pressure sensor is disposed on the touch substrate. The detection light source is arranged below the touch substrate and emits detection light to irradiate the external object through the touch substrate. The light receiver is disposed under the touch substrate to receive light returned through an external object through the touch substrate.

Hereinafter, an embodiment in which the blood pressure detection apparatus 10 is applied to the electronic device 1 will be described in detail with reference to the drawings.

Fig. 1 is a schematic perspective view of an electronic device 1 to which a blood pressure detecting device 10 provided in an embodiment of the present application is applied. Fig. 2 is a schematic diagram of functional modules of the blood pressure detecting device 10 applied to the electronic device 1 according to the embodiment of the present application.

Referring to fig. 1 and 2, the electronic apparatus 1 includes a blood pressure detection device 10 for detecting blood pressure of the external object 2. The blood pressure detecting device 10 includes a touch screen 12, a display screen 14, a light receiver 16, a control module 17 and a processing module 18. The display screen 14 includes a display surface 142, and the display screen 14 emits visible light through the display surface 142 to display a picture. The surface of the display screen 14 emitting visible light is a display surface 142, and the touch screen 12 is attached to the display surface 142 to transmit the visible light emitted by the display screen 14. The touch screen 12 includes a pressure sensor 122 for detecting a touch pressure of the external object 2. The control module 17 controls at least a part of the display pixels 140 of the display screen 14 to emit detection light to illuminate the external object 2 when detecting the blood pressure. The light receiver 16 is configured to receive light returned from the external object 2 through the touch screen 12 and at least a portion of the display screen 14, and convert the received light into a Photo Plethysmograph (PPG) signal of the external object 2. The processing module 18 calculates a blood pressure value of the external subject 2 from the detected touch pressure of the external subject 2 and the PPG signal. Therefore, the blood pressure detecting device 10 makes full use of the light emitted from the display screen 14 and the pressure sensor 122 of the touch screen 12 to conveniently and effectively create detecting conditions, so as to realize continuous detection of the blood pressure of the arm of the user.

Wherein the external object 2 is, for example, but not limited to, a finger, a wrist, a forehead, an ear, an elbow, an arm, etc. of the user, and has different blood vessels distributed on the body. The electronic device 1 is, for example, but not limited to, different types of electronic products such as consumer electronics, home electronics, vehicle-mounted electronics, and medical devices. Consumer electronics are for example mobile phones, tablet computers, laptops, desktop displays, all-in-one computers, and various types of wearable devices, such as: smart watches, headsets, necklaces, earrings, rings, bracelets, and the like. Household electronic products are, for example, smart door locks, televisions, refrigerators, mattresses and the like. The vehicle-mounted electronic product is, for example, a multifunctional steering wheel, a vehicle-mounted touch interaction device, and the like. The medical device is for example a portable blood pressure meter, a vital signs monitoring system or the like.

Next, the blood pressure detection by pressing the finger will be described by taking the external object 2 as the user's finger as an example.

Optionally, in some embodiments, the blood pressure detecting device 10 may further include a protective layer 11. The protective layer 11 is disposed above the touch substrate 12, i.e., on the surface of the touch substrate 12 on the light emitting side. The protective layer 11 can transmit light emitted from the display 14 for displaying a picture, and protect the touch substrate 12 and the display 14 from damage. The protective layer 11 may comprise a transparent material such as, but not limited to, transparent glass, transparent polymer, and the like. The protective layer 11 may have a single-layer structure or a multi-layer structure. The protective layer 11 is a substantially thin plate having a predetermined length, width and thickness. It is understood that the protective layer 11 may include a plastic film, a tempered film, or other film layers, etc. to which a user is attached in actual use. The outer surface 110 of the protective layer 11 is the outermost surface of the electronic device 1. The external object 2 may directly contact the outer surface 110 of the protective layer 11 at the time of detection.

Alternatively, in some embodiments, the display 14 may be an active Light Emitting display, such as but not limited to an Organic Light-Emitting Diode (OLED) display, a Micro-LED (Micro-LED) display. The display screen 14 includes a plurality of display pixels 140, and the display pixels 140 are configured to emit visible light to display a picture. At least some of the display pixels 140 are detection pixels, and are also used for emitting detection light to illuminate the finger of the user during blood pressure detection. The detection light is visible light, and the wavelength variation range is 380 nanometers (nm) to 800 nm. Optionally, in some embodiments, the detection light is green light, and the wavelength variation range is 490nm to 570 nm.

Optionally, in some other embodiments, the Display 14 may also be a passive light emitting Display, such as a Liquid Crystal Display (LCD). As shown in fig. 3, the LCD panel 14 includes an LCD display panel 141 and a backlight module 143 stacked in sequence. The backlight module 143 includes a backlight source 145, a light guide plate 147 and an optical film layer set 148. The light emitted from the backlight source 143 is mixed by the light guide plate 147 and emitted, and then modulated by the optical film layer group 148 to be provided as backlight light to the LCD panel 141 for display. The light receiver 16 is disposed below the backlight module 143 to receive the light returned from the external object 2 through the LCD panel 14, and convert the received light into a PPG signal of the external object 2. The set of optical films 148 in the backlight module 143 can transmit a predetermined narrow-band light, such as: narrow band light with a center wavelength in the range of 400nm to 780 nm. Thus, the narrow band light returned via the finger may be received by the light receiver 16 through the LCD display screen without affecting the display experience of the LCD display screen 14.

As shown in fig. 4, in some embodiments, the detection pixels 140 may be disposed around the light receiver 16 centered on the light receiver 16.

As shown in fig. 5, in some embodiments, the blood pressure detecting device 10 may further include a detecting light source 15, and the detecting light source 15 is configured to emit detecting light to irradiate the finger of the user for blood pressure detection. Therefore, the display screen 14 can choose not to emit the detection light when the blood pressure is detected.

Alternatively, in some embodiments, the detection light source 15 may be disposed below a display area of the display screen 14 capable of displaying pictures, that is, a vertical projection of the detection light source 15 on the display screen 14 is located in the display area. The detection light emitted by the detection light source 15 irradiates the finger of the user through the display screen 14 and the touch screen 12. Alternatively, the detection light emitted from the detection light source 15 may bypass the display screen 14 and/or the touch screen 12 through a light guide element (not shown) to illuminate the user's finger.

Optionally, in some embodiments, the detection light source 15 may also be disposed in a non-display area of the blood pressure detection device 10. That is, the vertical projection of the detection light source 15 on the protective layer 11 and the vertical projection of the display area of the display screen 14 on the protective layer 11 do not coincide with each other. For example: the detection light source 15 may be disposed under a portion of the protective layer 11 beyond the edge of the display area of the display screen 14, or disposed in an area of the display screen 14 where the display pixels 140 are not disposed. The detection light emitted by the detection light source 15 may not illuminate the user's finger through the display screen 14 and/or the touch screen 12, or may illuminate the user's finger only partially through the display screen 14 and/or the touch screen 12.

Optionally, in some embodiments, the touch panel 12 includes a light-transmissive substrate 120, and the substrate 120 includes a first surface 123 and a second surface 124 opposite to each other along a light-transmissive direction. The pressure sensor 122 may be a pressure sensing electrode disposed on the first surface 123 and/or the second surface 124 of the substrate 120. The pressure sensing electrode 122 may be made of a transparent conductive material, such as, but not limited to, indium tin oxide (In)₂O₃Sn, ITO), aluminum-doped zinc oxide (ZnO: Al, AZO), fluorine-doped tin oxide (SnO)₂F, FTO), antimony-doped tin oxide (SnO)₂Sb, ATO), and the like.

Optionally, in some embodiments, when the finger touches the substrate 120, the substrate 120 deforms to a corresponding degree according to the pressing force of the finger. The electrical characteristics of the pressure sensor 122 disposed on the surface of the substrate 120 may change with the deformation of the substrate 120, thereby generating a corresponding degree of change in the pressure detection signal. For example: the pressure sensor 122 is a strain-resistance type pressure sensor, and the resistance value thereof sensitively changes along with the deformation of the substrate 120 caused by the touch force of the finger.

Alternatively, in some other embodiments, the pressure sensor 122 may directly sense a change in touch pressure and output a pressure detection signal corresponding to the change. For example: the pressure sensor 122 may be made of a pressure sensitive material, and the touch pressure acting on the pressure sensitive material causes the internal structure of the material to change, thereby changing its electrical characteristics, and thus generating a corresponding degree of change in the pressure detection signal. Such as, but not limited to, piezoresistive material or piezoelectric material, and the pressure sensing electrode 122 is a piezoresistive pressure sensor or a piezoelectric pressure sensor.

The light receiver 16 has a preset detection range, that is, a spatial range in which the light receiver 16 can effectively receive light returned via a finger. The areas of the protective layer 11, the touch screen 12 and the display screen 14 within the detection range of the light receiver 16 are defined as respective detection areas 112. When performing blood pressure detection, the user touches a finger to the protective layer 11 or the detection area 112 of the touch screen 12, so that the light receiver 16 can effectively acquire the light returned by the finger. Optionally, the detection area 112 is located within a display area of the display screen 14. Alternatively, the detection area 112 is in the same range as the display area of the display screen 14.

The light receiver 16 may be a semiconductor light-sensitive element or other suitable type of light-sensitive element. The Semiconductor photosensitive element includes, but is not limited to, any one or more of a Thin Film Transistor (TFT), a Complementary Metal Oxide Semiconductor (CMOS) Transistor, a Charge-coupled Device (CCD), and a Photodiode (PD), and may also be any other suitable type of Semiconductor photosensitive element, which is not limited in this application.

It will be appreciated that in some embodiments, the light receiver 16 may also double as a fingerprint sensor for acquiring a fingerprint image of the user's finger from light returning through the finger for fingerprint recognition.

As shown in fig. 2, in some embodiments, the pressure sensor 122 is disposed only in the detection area 112 of the touch screen 12 to detect a touch pressure generated when a finger presses the detection area 112 during blood pressure detection. For example, the pressure sensor 122 is one or more pressure sensing electrodes disposed within the detection region 112 on the first surface 123 and/or the second surface 124 of the substrate 120.

It is understood that in other embodiments, the pressure sensor 122 may be disposed at other positions on the touch screen 12 besides the detection area 112. For example, as shown in fig. 5, the pressure sensor 122 is disposed on the first surface 123 and/or the second surface 124 of the substrate 120 in a range corresponding to the display area, so that the touch strength of the finger at any position in the display area of the display screen 14 can be detected.

It is understood that in some embodiments, the touch screen 12 further includes a touch sensor (not shown). The touch sensor senses a touch condition of a finger on the touch screen 12 to generate a corresponding touch detection signal. The touch sensor outputs the touch detection signal to a signal processing circuit (not shown) dedicated to the touch sensor through a transparent trace for processing to obtain corresponding touch information, for example: the coordinates or coordinate range of the finger touch position, the time of the finger touch, the sliding track of the finger, and the like.

Optionally, in some embodiments, the light receiver 16 is disposed below the display screen 14. The light receiver 16 receives light returned by a finger through the touch screen 12 and the display screen 14, and converts the received light into a PPG signal of the user. For example, the light receiver 16 may include one or more photodetectors 160, and the photodetectors 160 may be formed by photodiodes to convert received light into corresponding electrical signals, and the electrical signals output from the photodetectors 160 may be processed by a dedicated PPG signal processing circuit (not shown) to form the PPG signal for external output. The PPG signal processing circuitry may perform pre-processing when receiving electrical signals from the photodetector 160, such as: the received electric signal is subjected to noise removal, signal amplification and the like, and if the received electric signal is an analog signal, the PPG signal processing circuit can convert the electric signal into a digital signal after processing.

As shown in fig. 5, in some embodiments, the optical receiver 16 may also be integrated within the display screen 14. For example: the light receiver 16 and the display pixel 140 are formed on the same substrate, which may be a semiconductor substrate, and the photodetector 160 of the light receiver 16 and the light emitting unit structure of the display pixel 140 may be formed on the semiconductor substrate through a semiconductor process.

Specifically, the display pixel 140 may be divided into a plurality of pixel units 144 arranged in an array, and each pixel unit 144 includes corresponding sub-pixels 1400 for emitting red, green, and blue visible light respectively. A specific area may be allocated in the pixel unit 144 for arranging the photo detector 160, and the corresponding photo detectors 160 in the plurality of pixel units 144 may constitute the photo detector 160 array of the light receiver 16 to receive the light returned by the finger for blood pressure detection.

Optionally, in some embodiments, the photodetector 160 of the light receiver 16 is only disposed in a part of the pixel units 144 of the display screen 14, and the detection area 112 of the blood pressure detecting device 10 is located in an area where the pixel units 144 of the photodetector 160 are disposed.

As shown in fig. 7, in some other embodiments, a corresponding photodetector 160 may be disposed in each pixel unit 144 of the display screen 14, so that blood pressure detection can be performed in the whole display area of the display screen 14. That is, the range of the detection area is the same as the display area range of the display screen 14.

The PPG signal is a waveform that reflects the change in blood vessel volume in the body caused by the action of the heartbeat. Blood released from the left ventricle during systole is transferred to peripheral tissues, causing the blood volume of arterial blood to increase. During this time, the red blood cells deliver more oxyhemoglobin to the peripheral tissues. During diastole, blood flows from peripheral tissues to the heart. When the detection light is irradiated to the peripheral vein, the light is absorbed by the peripheral tissue, and the absorbance depends on the red blood cell pressure and the blood volume. Thus, the absorbance has a maximum value in the systolic phase of the heart and a minimum value in the diastolic phase of the heart. As shown in fig. 8, the finger vessels have Diastolic (DBP), Systolic (SBP) and Mean Arterial Pressure (MAP). The PPG signal appears as a waveform that oscillates periodically with the heart beat, reflecting the maximum value of the absorbance in systole and the minimum value of the absorbance in diastole. Therefore, the PPG signal reflects the variation of blood pressure along with the heartbeat, and can be used for measuring the blood pressure.

As shown in fig. 9, when the user performs blood pressure detection by finger touch, the touch pressure may have an influence on the detected PPG signal. When the touch pressure is less than or greater than the Mean Arterial Pressure (MAP), the internal tissues of the finger may act on the blood vessels, causing the amplitude of the detected PPG signal to diminish. When the touch pressure is equal to the Mean Arterial Pressure (MAP), the force of the finger internal tissue on the blood vessel is zero, and the amplitude of the detected PPG signal is maximum. The PPG signal amplitude refers to the difference between the peak and valley of the PPG signal over one heart cycle. The processing module 18 may analyze the change in the PPG signal from the touch pressure and estimate the touch pressure corresponding to the PPG signal with the largest amplitude as the Mean Arterial Pressure (MAP) of the finger vessels.

As described above, the Mean Arterial Pressure (MAP) of the user at the finger blood vessel can be obtained according to the principle shown in fig. 9, however, there is a difference between the arm blood pressure and the finger blood pressure of the human body, and it is also customary to use the arm blood pressure as a reference standard for the health condition of the human body in medicine. Therefore, it is necessary to acquire the arm blood pressure of the user by touching the measured finger blood pressure with the finger of the user.

As shown in fig. 9, the processing module 18 uses the touch pressure as an abscissa x and the PPG signal amplitude as an ordinate y, and constructs a change curve of the PPG signal amplitude along with the change of the touch pressure according to the acquired touch pressure and the PPG signal amplitude measured under the touch pressure. It is understood that the measured multiple coordinate points corresponding to different time points are obtained by measuring, and the curve of the PPG signal with the touch pressure is obtained by smoothing the coordinate points obtained by measuring. Such as, but not limited to, moving averaging (moving averaging) and exponential smoothing (exponential smoothing).

According to the principle shown in fig. 9, the finger touch pressure F1 corresponding to the maximum H1 of the PPG signal amplitude is the mean arterial pressure of the finger blood vessel. In fig. 10, finger touch pressure F1 corresponds to the dividing point of the change in PPG signal amplitude H, which gradually increases with increasing finger touch pressure F when finger touch pressure F is less than F1, reaches a maximum value H1 when finger touch pressure F increases to F1, and gradually decreases with increasing finger touch pressure as finger touch pressure F continues to increase beyond F1. Therefore, for different sections of change curves corresponding to the intervals that the finger touch pressure F is greater than F1 and less than F1, fitting is respectively carried out by adopting two half Gaussian functions to obtain an equation describing the change curve of the PPG signal along with the touch pressure:

wherein H2 is the initial value of the amplitude H of the PPG signal, H1 and F1 are the maximum value of the amplitude H of the PPG signal and the corresponding touch pressure, respectively, and F2 is x<Width of half Gaussian function of segment F1, F3 being x>The width of the half-gaussian function of segment F1, F2 and F3, is numerically equal to the standard deviation of the half-gaussian function within the corresponding interval.

In the detection process, the touch pressure applied by the user's finger needs to satisfy certain requirements, such as: the initial applied touch pressure value and the subsequent gradually increasing touch pressure change more or less rapidly. As shown in fig. 11, in some embodiments, the touch pressure value applied by the user through the finger at the time of detection needs to be within a range between the preset reference lines GL. The blood pressure detection device 10 or the electronic device 1 equipped with the blood pressure detection device 10 can guide the user to apply the touch pressure as required by displaying the finger touch pressure variation value and the reference line GL in real time. Alternatively, in some embodiments, the touch pressure of the selected data taken by the blood pressure monitor analysis may range from 40 millimeters of mercury (mmHg) to a preset touch pressure end value FT.

In order to make the PPG signal amplitude fitted by the selected data to be within a reasonable variation range with the touch pressure variation curve, characteristic parameters of the variation curve, such as: h1, H2, F2, F3, and end-value parameters such as: the range of variation of PPG signal amplitude value H40 at a touch pressure of 40mmHg and PPG signal amplitude value HT at a final touch pressure value FT is defined to prevent the data acquired at the time of blood pressure detection analysis from being data whose value is significantly unreasonable due to measurement errors. Optionally, in some embodiments, the characteristic parameter and the end value parameter of the variation curve need to satisfy the following relationship:

0<F2<100mmHg，0<F3<100mmHg；

HT<0.5H1,H40<0.8H1；0<H2<H1

therefore, when blood pressure detection is performed, if the touch pressure applied by the finger of the user does not meet the preset requirement or the characteristic parameter and the end parameter of the curve of the PPG signal amplitude changing along with the touch pressure fitted by the acquired data do not meet the above relationship, the blood pressure detection device 10 or the electronic device 1 equipped with the blood pressure detection device 10 will not output the blood pressure value but prompt the user to measure again.

After fitting the curve graph of the PPG signal amplitude changing along with the touch pressure, taking a plurality of groups of actual arm blood pressure values measured by a pressurizing sleeve type mercury sphygmomanometer as reference, and obtaining an empirical formula for calculating the arm blood pressure according to the characteristic parameters of the curve graph of the PPG signal amplitude changing along with the touch pressure by adopting a stepwise regression method:

the arm diastolic pressure DBP is K1 · F1+ K2 · H1/H2 · F2+ K3;

the arm mean blood pressure MBP is K4 & F1+ K5 & H1/H2 & F2+ K6;

arm systolic pressure SBP is K7 MBP + K8 DBP

Wherein K1, K2, K3, K4, K5, K6, K7 and K8 are empirical coefficients whose values depend on a plurality of sets of said actual arm blood pressure values of significant statistical significance and on correlation coefficients in a regression model. It will be appreciated that the empirical coefficients and equations may vary with the number of actual arm blood pressure values that are added to the calculation. Optionally, in some embodiments, the empirical parameter is, for example: k1 ═ 0.63; k2 ═ 1.47; k3 ═ 23.1; k4 ═ 0.58; k5 ═ 1.43; k6 ═ 33.4; k7 ═ 2.3; k8 ═ 1.4.

When blood pressure is detected, the control module 17 controls the display screen 14 and/or the detection light source 15 to emit detection light to irradiate the finger of the user. The control module 17 activates the light receiver 16 to receive the light returned via the finger. After the light receiver 16 is activated, the control module 17 controls the processing module 18 to acquire PPG signals from the light receiver 16 and touch pressure of the finger from the pressure sensor 122. The processing module 18 may calculate the arm blood pressure according to the acquired touch pressure and the PPG signal by using the empirical formula obtained by the above method, which reflects the relationship between the arm blood pressure and the finger blood pressure characteristic parameter.

Optionally, in some embodiments, the control module 17 may further obtain a touch condition of the detection area 112 through a touch sensor (not shown) of the touch substrate 12, and control the detection light source to emit the detection light after determining that the detection area 112 is sufficiently touched. The judgment conditions are, for example: the duration of the detection of the touch detection signal within the detection area 112 exceeds a preset time threshold.

Optionally, in some embodiments, the control module 17 may be further configured to control the display screen 14 to display a preset prompt pattern at a position corresponding to the detection area 112 when blood pressure detection is required, so as to remind a user of the position of the detection area 112, and thus, the user can conveniently and accurately touch the detection area 112. For example, when an application program that needs to detect blood pressure is started, the control module 17 may control the display 14 to display a preset prompt pattern in the detection area 112.

Optionally, in some embodiments, the blood pressure detecting device 10 may further include a memory (not shown). Intermediate data of the blood pressure detection process may be stored in the memory. Such as but not limited to: touch pressure detected by the pressure sensor 122, PPG signals of the user detected by the optical receiver 16, and process data generated by the processing module in calculating the arm blood pressure, etc. The processing module 18 may obtain the above data from the memory to calculate the blood pressure information of the user, for example: arm diastolic pressure, arm mean blood pressure, and arm systolic pressure. The blood pressure information may also be stored in the memory as part of the user information after being calculated.

Alternatively, in some embodiments, the control module 17 and/or the processing module 18 may be firmware solidified in a memory or computer software code stored in a memory. The control module 17 and the processing module 18 are executed by one or more corresponding processors (not shown) to control the relevant components to implement the corresponding functions. Such as, but not limited to, an Application Processor (AP), a Central Processing Unit (CPU), a Microprocessor (MCU), etc. The Memory includes, but is not limited to, a Flash Memory (Flash Memory), a charged Erasable Programmable read only Memory (EEPROM), a Programmable Read Only Memory (PROM), and a hard disk.

Optionally, in some embodiments, the processor and/or memory may be disposed within the blood pressure detection device 1016, such as: integrated on the same circuit board as the optical receiver 16. Optionally, in some other embodiments, the processor and/or the memory may also be disposed in other locations of the electronic device 1, such as: the main circuit board of the mobile phone.

Optionally, in some embodiments, the functions of the control module 17 and/or the processing module 18 may also be implemented by hardware, for example, by any one or a combination of the following technologies: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like. It is understood that the above-mentioned hardware for implementing the functions of the control module 17 and/or the processing module 18 may be disposed in the blood pressure detecting device 10, such as: integrated on the same circuit board as the optical receiver 162. The hardware for implementing the functions of the control module 17 and/or the processing module 18 may also be disposed at other positions of the electronic device 1, such as: is arranged on the mainboard of the mobile phone.

Optionally, in some embodiments, the electronic device 1 is a mobile phone, and the blood pressure detecting device 10 is an off-screen/on-screen blood pressure detecting device disposed in the mobile phone. The optical receiver can be connected to the internal structure of the mobile phone, for example: the middle frame and the like are arranged at preset positions below the display screen of the mobile phone. The user can carry out blood pressure detection by touching the finger to the detection area on the display screen of the mobile phone.

Compared with the prior art, the blood pressure detection device 10 of the present application makes full use of the light emitted from the display screen 14 and the pressure sensor 122 of the touch screen 12, so as to conveniently and effectively create the detection condition, and can realize the continuous detection of the arm blood pressure of the user without pressurizing the cuff.

As shown in fig. 12, in some embodiments, the blood pressure detecting device 10 includes a touch substrate 12, a pressure sensor 122, a detecting light source 15, a light receiver 16, a control module 17, and a processing module 18. The touch substrate 12 is used for contacting the external object 2 during blood pressure detection. The pressure sensor 122 is disposed on the touch substrate 12, and detects a touch pressure of the external object 2. The detection light source 15 is disposed below the touch substrate 12, and is configured to emit detection light through the touch substrate 12 to irradiate the external object 2. The optical receiver 16 is disposed below the touch substrate 12, and is configured to receive light returned through the external object 2 through the touch substrate 12 and convert the received light into a Photo Plethysmograph (PPG) signal of the external object 2. The processing module 18 calculates a blood pressure value of the external subject 2 from the detected touch pressure of the external subject 2 and the PPG signal. Therefore, the blood pressure detecting device 10 makes full use of the detecting light emitted by the detecting light source 15 and the pressure sensor 122 of the touch substrate 12 to conveniently and effectively create detecting conditions, so as to realize continuous detection of the blood pressure of the arm of the user. Unlike the previous embodiment, the blood pressure monitor 10 of fig. 12 does not have a display screen, and is suitable for being disposed at a position where the electronic device does not have a display screen.

The touch substrate 12 may be made of a light transmissive material. The touch substrate 12 includes a first surface 123 and a second surface 124 disposed opposite each other along a light transmission direction. Wherein the first surface 123 is a surface facing away from the detection light source 15 and the light receiver 16. Alternatively, in some embodiments, the pressure sensor 122 may be a pressure sensing electrode disposed on the first surface 123 and/or the second surface 124 of the touch substrate 12. The pressure sensing electrode 122 may be made of a transparent conductive material, such as, but not limited to, indium tin oxide (In)₂O₃Sn, ITO), aluminum-doped zinc oxide (ZnO: Al, AZO), fluorine-doped tin oxide (SnO)₂F, FTO), antimony-doped tin oxide (SnO)₂Sb, ATO), and the like. The pressure sensing electrode 122 outputs the pressure detection signal to a signal processing circuit (not shown) dedicated to the pressure sensor 122 through a transparent trace for processing to obtain a corresponding touch pressure value.

Similar to the previous embodiments, the pressure sensor 122 may alternatively be, but is not limited to, a strain-resistance pressure sensor, a piezoresistive pressure sensor, or a piezoelectric pressure sensor.

The light receiver 16 has a preset detection range, that is, a spatial range in which the light receiver 16 can effectively receive light returned via a finger. The areas of the protective layer 11 and the touch substrate 12 within the detection range of the light receiver 16 are defined as respective detection areas 112. When performing blood pressure detection, the user touches a finger to the protective layer 11 or the detection area 112 of the touch substrate 12, so that the light receiver 16 can effectively acquire the light returned via the finger.

Alternatively, in some embodiments, the pressure sensor 122 is disposed only in the detection area 112 of the touch substrate 12 to detect a touch pressure of a finger pressing on the detection area 112 when performing blood pressure detection. For example, the pressure sensor 122 is one or more pressure sensing electrodes disposed within the detection region 112 on the first surface 123 and/or the second surface 124 of the substrate 120.

It will be appreciated that in other embodiments, the pressure sensor 122 may be disposed on the touch substrate 12 at a location other than the detection region 112.

It will be appreciated that in some embodiments, the touch substrate 12 also includes touch sensors (not shown). The touch sensor senses a touch condition of an external object 2 on the touch substrate 12 to generate a corresponding touch detection signal. The touch sensor outputs the touch detection signal to a signal processing circuit (not shown) dedicated to the touch sensor through a transparent trace for processing to obtain corresponding touch information, for example: the coordinates or coordinate range of the touch location, the time of the touch, and the touch slide trajectory, etc. Optionally, the control module 17 may determine a contact condition between the external object 2 and the touch substrate 12 according to the touch detection signal, so as to control the detection light source 15 to emit the detection light after the external object 2 contacts the touch substrate 12.

Optionally, in some embodiments, the detection light source 15 may include one or more light emitting units (not shown). The plurality of light emitting units may be arranged in an array. A plurality of said light emitting units may also be symmetrically distributed around said light receiver to evenly illuminate a finger positioned above the light receiver from different directions. The Light Emitting unit is, for example, but not limited to, a Light Emitting Diode (LED), a Vertical Cavity Surface Emitting Laser (VCSEL), or a Laser Diode (LD). Optionally, in some embodiments, the detection light is visible light and the wavelength ranges from 380 nanometers (nm) to 780 nm. For example, the detection light is green light, and the wavelength variation range is 490nm to 570 nm.

Optionally, in some other embodiments, the detection light may also be non-visible light, such as: infrared light or near infrared light with a wavelength range of 700nm to 1100 nm.

Optionally, in some embodiments, a light shielding structure 13 may be further disposed between the detection light source 15 and the light receiver 16. The light shielding structure is made of a material opaque to light, and is used for reducing optical crosstalk between the detection light source 15 and the light receiver 16.

The optical receiver 16 is disposed below the touch substrate 12, and the optical receiver 16 receives light returned by a finger through the touch substrate 12 and converts the received light into a PPG signal of the user. Optionally, the light receiver 16 may include one or more photodetectors 160, and the photodetectors 160 may be formed by photodiodes to convert the received light into corresponding electrical signals, and the electrical signals output from the photodetectors 160 may be processed by a dedicated PPG signal processing circuit (not shown) to form the PPG signal for external output. The PPG signal processing circuitry may perform pre-processing when receiving electrical signals from the photodetector 160, such as: the received electric signal is subjected to noise removal, signal amplification and the like, and if the received electric signal is an analog signal, the PPG signal processing circuit can convert the electric signal into a digital signal after processing.

Compared with the prior art, the blood pressure detecting device 10 of the present application utilizes the light emitted by the detecting light source 15 and the pressure sensor 122 of the touch substrate 12 to conveniently and effectively create the detecting condition, and can realize the continuous detection of the blood pressure of the arm of the user without pressurizing the cuff.

As shown in fig. 13, in some embodiments, the electronic device 100 is a mobile phone, and the blood pressure detecting device 20 is a side blood pressure detecting device installed on a side frame of the mobile phone 1. For convenience of description, a rectangular coordinate system of the electronic device 100 is defined in fig. 13. The rectangular coordinate system in fig. 1 includes x, y and z axes, where the x axis is a width direction of the electronic apparatus 100, the y axis is a length direction of the electronic apparatus 100, and the z axis is a thickness direction of the electronic apparatus 100. The correspondence between the rectangular coordinate system wlt of the side blood pressure detecting device 20 and the rectangular coordinate system xyz of the electronic device 100 is: the longitudinal direction l of the side blood pressure monitor 10 is the same as the longitudinal direction y of the electronic device 100, the width direction w of the side blood pressure monitor 20 is the same as the thickness direction z of the electronic device 100, and the thickness direction t of the side blood pressure monitor 20 is the same as the width direction x of the electronic device 100.

The main body 10 of the electronic device 100 includes a front surface 101, a back surface 103, and a side 102. The front surface 101 and the back surface 103 are sequentially disposed opposite to each other along a thickness direction z of the electronic device 100, and the side edges 102 are respectively connected to the front surface 101 and the back surface 103. Optionally, in some embodiments, the front surface 101 may be a side surface of the electronic device 100 that is mainly facing the user when in use, for example: the front surface 101 is a plane where a display surface of the electronic device 100 for displaying a picture is located. The side 102 is, for example, a side frame of the electronic device 100. Opposite sides of the side edge 102 respectively connect the peripheral edge of the front surface 101 and the peripheral edge of the back surface 103, and correspondingly, the side edge 102 respectively includes a length portion along the length direction y of the electronic device 100 and a width portion along the width direction x of the electronic device 100.

Optionally, in some embodiments, the side blood pressure monitor 20 is disposed at a portion of the length of the side 102 of the electronic device 100. The side edge 102 is provided with a mounting hole 104, the side edge type blood pressure detection device 20 is arranged on the side edge 102 of the main body 10 through the mounting hole 104, and part of the outer surface of the side edge type blood pressure detection device 20 is exposed from the mounting hole 104.

Optionally, in some embodiments, the shape of the part of the outer surface of the lateral side 102 of the main body 10 of the lateral blood pressure monitor 20 exposed from the lateral side 102 and the shape of the adjacent part of the lateral side 102 match each other, so as to maintain the overall consistency of the appearance of the electronic device 100 and improve the holding feeling of the user. The shapes of the side edge type blood pressure detecting device 20 are matched with each other, which means that the exposed part of the outer surface and the adjacent part of the side edge 102 of the side edge type blood pressure detecting device 20 have the same shape, for example: the exposed part of the outer surface of the side blood pressure monitor 20 has the same curvature as the adjacent part of the side 102.

Referring to fig. 14, 15 and 16, in some embodiments, the side blood pressure monitor 20 is in a narrow strip shape, the side blood pressure monitor 20 is installed in the installation hole 104 according to a placement angle of the touch substrate 12 facing the outside of the electronic device 100, wherein the length direction l of the side blood pressure monitor is along the length direction y of the electronic device 100, and the width direction w of the side blood pressure monitor is along the thickness direction z of the electronic device 100. The touch substrate 12 is also formed in a narrow strip shape, and has a longitudinal direction l, a width direction w, and a thickness direction t that coincide with the side blood pressure monitor 20. The first surface 123 of the touch substrate 12 facing away from the detection light source 15 and the light receiver 16 is an exposed surface of the whole side blood pressure detection device 20, and needs to be matched with the shape of the side 102 of the adjacent electronic device 100. For example: if the side 102 of the adjacent electronic device 100 is a curved surface, the first surface 123 of the touch substrate 12 is also a curved surface and has a curvature matching with the surface of the side 102 of the adjacent electronic device 100, so that the exposed outer surface 123 of the side blood pressure monitor 20 matches with the shape of the surface of the adjacent side 102. In some embodiments, the curvature radius of each point on the first surface 123 of the touch substrate 12 ranges from 2mm to 10mm, and is curved along the width direction of the touch substrate 12 in a narrow strip shape.

Alternatively, the detection light source 15 and the light receiver 16 may be disposed on the second surface 124 of the touch substrate 12 or below the second surface 124. Alternatively, as shown in fig. 15, the detection light source 15 and the light receiver 16 may be sequentially arranged along the length direction l of the touch substrate 12 to reduce the size of the whole side blood pressure detection device 20 in the width direction w as much as possible.

Optionally, in some embodiments, the side blood pressure detecting device 20 further includes a circuit board 30, and the detecting light source 15 and the light receiver 16 are disposed on the circuit board 30 and electrically connected to the outside through the circuit board 30. Optionally, the circuit board 30 is also correspondingly shaped like a narrow strip, and has a length direction l, a width direction w and a thickness direction t which are consistent with the side blood pressure monitor 20. The width w of the circuit board 30 itself may be smaller than the width w of the touch substrate 12, and the width w of the circuit board 30 itself may also be equal to or greater than the width w of the touch substrate 12. Alternatively, a circuit board 30 on which the detection light source 15 and the light receiver 16 are disposed is fixedly connected to the touch substrate 12. In this case, the pressure sensor 122 may also be fixedly connected to the other side surface of the circuit board 30 opposite to the touch substrate 12, and since the touch substrate 12, the circuit board 30 and the pressure sensor 122 are fixedly connected to each other, when the user touches the touch substrate with a finger, the touch pressure may also be transmitted to the pressure sensor for sensing. Of course, the pressure sensor 122 may also be disposed on the first surface 123 and/or the second surface 124 of the touch substrate 12, which is not particularly limited in this application.

Optionally, in some embodiments, the touch substrate 12 extends out of the connecting protrusion 125 in a direction away from the first surface 123 at an edge region of the second surface 124, so that the second surface 124 forms a step-shaped surface. The touch substrate 12 is attached to the circuit board 30 through the connection protrusion 125 to achieve a fixed connection. In this case, a receiving space 126 may be formed below a portion of the second surface 124 of the touch substrate 12, and the detection light source 15 and the light receiver 16 disposed on the circuit board 30 may be received in the receiving space 126.

In other embodiments, as shown in fig. 17, the second surface 124 of the touch substrate 12 may be a flat surface, and the circuit board 30 provided with the detecting light source 15 and the light receiver 16 is fixed to the second surface 124 of the touch substrate 12 by a light-transmitting sealant 127. In this case, the space between the detection light source 15 and the light receiver 16 and the touch substrate 12 is filled with the sealant 127. Similarly, the pressure sensor 122 may be fixedly connected to the other side surface of the circuit board 30 facing away from the touch substrate 12, and may also be disposed on the first surface 123 and/or the second surface 124 of the touch substrate 12.

As shown in fig. 18, in some other embodiments, the detection light source 15 and the optical receiver are disposed on the circuit board 3, and the touch substrate 12 may be a package disposed on the circuit board 30 for packaging the detection light source 15 and the optical receiver 16. That is, the detection light source 15 and the light receiver are located inside the touch substrate 12 so as to emit and receive light through a portion of the touch substrate 12. The pressure sensor 122 may be fixedly attached to the other side surface of the circuit board 30 facing away from the touch substrate 12. Similarly, the pressure sensor 122 may be fixedly connected to the other side surface of the circuit board 30 facing away from the touch substrate 12, and may also be disposed on the first surface 123 and/or the second surface 124 of the touch substrate 12.

Alternatively, in some other embodiments, the detection light source 15, the light receiver 16 and/or the circuit board 30 may not be fixedly connected to the touch substrate 12, but may be disposed on other internal structures of the electronic device 100 opposite to the touch substrate 12. In this case, the pressure sensor 122 needs to be disposed on the touch substrate 12 to detect the touch pressure of the user.

It is understood that in some other embodiments, the blood pressure detecting device 20 may be disposed on other surfaces of the electronic device 100 besides the side edge 102, such as: the back of the electronic device 100. The same technical effects as above can be achieved by designing the shape of the exposed outer surface of the blood pressure detecting device 20 to match the shape of the surface of the electronic device 100.

Optionally, in some embodiments, the side blood pressure monitor 20 may be integrated with a functional component disposed on a side frame of the mobile phone, such as, but not limited to, a power key, a volume key, a Subscriber Identity Module (SIM) card slot, and the like. Alternatively, the side blood pressure detecting device 20 may be separately disposed at a preset position on the side frame of the mobile phone, for example, a position where fingers hold the side frame when an external object operates the mobile phone.

It should be noted that, depending on the size of the side blood pressure detection device 20 shown in fig. 13, the side blood pressure detection device 20 in fig. 13 is only exemplarily shown in a rectangular parallelepiped at the installation position on the electronic device 100, and the specific structure of the side blood pressure detection device 20 is not shown.

As shown in fig. 19, in some embodiments, the electronic device 400 is a watch. The watch 400 includes an upper cover 401, a middle frame 402, and a lower cover 403, wherein the upper cover 401 and the lower cover 403 are respectively assembled on two opposite sides of the middle frame 402. The upper cover plate 401 is one side facing the user for viewing after the watch is worn, and the lower cover plate 403 is one side contacting with the skin of the user after the watch is worn. The blood pressure detecting device 40 is mounted inside the wristwatch at a position close to the lower cover 403, and detects blood pressure through the lower cover 403.

Alternatively, the lower cover 403 of the watch 400 may be used as the touch substrate 42 of the blood pressure detecting device 40, and the outer surface of the lower cover 203 contacting with the skin of the user is the first surface 423 of the touch substrate 42. The detection light source 45 and the light receiver 46 may be disposed directly on the second surface 424 of the touch substrate 42. Alternatively, the detection light source 45 and the light receiver 46 may be disposed on other structures within the watch 400 without direct contact with the second surface 424. The pressure sensors 422 are disposed on the first surface 423 and/or the second surface 424 of the touch substrate 42.

When the blood pressure detection by the wristwatch 400 is required, the detection light source 45 emits detection light through the touch substrate 42 to irradiate the body part of the user contacting the touch substrate 42. The light receiver 46 receives light returned through the body of the user through the touch substrate 42 to detect a PPG signal of the user. The user can adjust the touch pressure when the touch substrate 42 is in contact with the user's body part by pressing the worn watch 400, which can be detected by the pressure sensor 422. According to the blood pressure detection method described above, the processing module (not shown) may calculate the blood pressure information of the user according to the detected touch pressure and the PPG signal, for example: examples of users are: arm diastolic pressure, arm mean blood pressure, and arm systolic pressure.

It should be noted that, part or all of the embodiments of the present application, and part or all of the modifications, replacements, alterations, splits, combinations, extensions, etc. of the embodiments are considered to be covered by the inventive idea of the present application without creative efforts, and belong to the protection scope of the present application.

Any reference in this specification to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature or structure is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature or structure in connection with other ones of the embodiments.

The orientations or positional relationships indicated by "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which may appear in the specification of the present application, are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present application, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present application, it should also be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted," and "connected" are to be understood in a broad sense, e.g., they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The above description is only for the specific embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A blood pressure monitor for detecting blood pressure of an external subject, comprising:

a pressure sensor for detecting a touch pressure of an external object;

2. The blood pressure detection device of claim 1, wherein the processing module fits the acquired touch pressure and PPG signal amplitude using two half-gaussian functions to obtain an equation for a curve of PPG signal amplitude versus touch pressure:

3. The blood pressure detection device as claimed in claim 2, wherein the characteristic parameters of the graph of the PPG signal amplitude variation with touch pressure are H1, H2, F1 and F2, and the empirical formula for calculating the arm blood pressure information is as follows:

the diastolic pressure of the arm is K1 & F1+ K2 & H1/H2 & F2+ K3;

the average blood pressure of the arm is K4 & F1+ K5 & H1/H2 & F2+ K6;

arm systolic pressure K7, arm mean blood pressure K8, arm diastolic pressure

4. The blood pressure monitor of claim 1, wherein the touch pressure range selected by the blood pressure monitor analysis is 40mmhg to a preset touch pressure end value FT, the PPG signal amplitude value at the touch pressure of 40mmhg is labeled H40, the PPG signal amplitude value at the touch pressure end value FT is labeled HT, H40 and HT are end parameters of a curve of the PPG signal amplitude versus touch pressure, and the characteristic parameter and the end parameter of the curve of the PPG signal amplitude versus touch pressure are required to satisfy the following relationships:

0<F2<100mmHg，0<F3<100mmHg；

HT<0.5H1,H40<0.8H1；0<H2<H1

5. The blood pressure monitor device of claim 1, further comprising:

6. The blood pressure detecting device according to claim 5, wherein the light receiver is disposed below the display screen to receive light returned via the external object through the touch screen and the display screen; or

7. The blood pressure monitor device of claim 1, further comprising:

8. An electronic device comprising the blood pressure detection device according to any one of claims 1 to 6, wherein the electronic device is a mobile phone, and the blood pressure detection device is an off-screen/on-screen blood pressure detection device provided inside the mobile phone.

9. An electronic device comprising the blood pressure detection apparatus according to any one of claims 1 to 4 and 7.

10. The electronic device of claim 10, wherein the main body of the electronic device includes a front surface, a back surface and side edges, the front surface and the back surface are disposed opposite to each other in a thickness direction of the electronic device, the side edges are respectively connected to the front surface and the back surface, the side edges are formed with mounting holes, the blood pressure detecting device is a side-edge type blood pressure detecting device, and the side-edge type blood pressure detecting device is disposed on the side edge of the main body through the mounting holes.

11. The electronic device according to claim 10, wherein the electronic device is a watch, the watch includes an upper cover plate, a middle frame, and a lower cover plate, the upper cover plate and the lower cover plate are respectively assembled on two opposite sides of the middle frame, the upper cover plate is a side facing a user for viewing after the watch is worn, the lower cover plate is a side contacting with skin of the user after the watch is worn, the lower cover plate is a touch substrate of the blood pressure detection device, the detection light source emits detection light through the touch substrate to irradiate a body part of the user contacting with the touch substrate, and the light receiver receives light returning through the body of the user through the touch substrate to detect PPG signals of the user.