PPG module, PPG signal measurement method and electronic device

Abstract

The present application provides a PPG module, a method for measuring a PPG signal, and an electronic device, and relates to the field of electronic technology. The PPG module in the present application includes: a central device, which is an optical transmitter or an optical receiver; at least three reference devices, which are arranged at the periphery of the central device and located at different orientations, and the type of the reference device is the same as that of the central device; a reference device, which is arranged in each reference area, and the reference area is the location of the angle space formed by two adjacent reference devices among the three reference devices and the central device, and the reference area includes at least one reference device that matches the central device. By using the PPG module of the present application, the optical measurement path of each optical transmitter in the PPG module can be increased, the optical efficiency of the optical transmitter can be improved, and the accuracy of the PPG module in measuring human body parameters can be improved.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a photoplethysmograph (PPG) module, a PPG signal measurement method, and an electronic device. Background Art

[0002] With the development of electronic technology, smart terminals can monitor relevant physiological parameters of the human body through sensors with specific functions. For example, a PPG module is installed in a smart terminal (such as a bracelet, watch, arm bag and other devices), and the PPG module can collect data such as the human heart rate, blood oxygen, and blood pressure. The PPG module mainly includes a light emitter and a photodetector (PD). The light emitter can be a light emitting diode (LED). The principle of the PPG module: the LED emits infrared light, red light or green light to illuminate the human skin, and then the PD collects the signal reflected and scattered by the human skin, and measures the change in the intensity of the reflected light caused by the blood flow, thereby obtaining the pulse waveform, and extracting effective signals from it to calculate the heart rate, blood pressure, blood oxygen and other human physiological parameters.

[0003] There are various layouts of PD and LED in the PPG module. The layout of PD and LED affects the overall optical efficiency, power consumption and size of the PPG module. It is necessary to reasonably plan the layout of PD and LED in the PPG module. Summary of the invention

[0004] In order to solve the above technical problems, the present application provides a PPG module, a PPG signal measurement method and an electronic device, which can increase the optical measurement path of each light emitter in the PPG module, improve the optical efficiency of the light emitter, and improve the accuracy of the PPG module in measuring human body parameters.

[0005] In a first aspect, the present application provides a PPG module, including a central device, which is a light transmitter or a light receiver; at least three reference devices, which are arranged on the periphery of the central device and located at different orientations, and the type of the reference devices is the same as that of the central device; a reference device is arranged in each reference area, and the reference area is the location of the angle space formed by two adjacent reference devices among the three reference devices and the central device; wherein, if the central device is a light transmitter, each reference area includes at least one reference device which is a light receiver; and if the central device is a light receiver, each reference area includes at least one reference device which is a light transmitter.

[0006] In this way, the reference device is set outside the central device and located in different directions. After the position of the central device is determined, the layout center of the current PPG module can be determined based on the position of the central device, and other PD devices or LED devices are arranged based on the position of the central device, so that the device arrangement in the PPG module is more regular and the speed of arranging the reference device is improved. The reference device is located in the reference area, which is determined based on the position of the reference device and the position of the central device. The reference device and the central device reduce the area where the reference device is arranged, thereby improving the speed of arranging the reference device. At the same time, when the central device is a light transmitter, each reference area includes at least one reference device that is a light receiver; when the central device is a light receiver, each reference area includes at least one reference device that is a light transmitter, so that at least one reference device in the reference area is spaced apart from the reference device, increasing the number of optical measurement paths of the light transmitter, thereby improving the optical efficiency of the light transmitter and reducing power consumption. For example, when the central device is a light transmitter, if there are three reference devices and there is at least one light receiver in the reference area, at this time, the central device and the light receivers in the three reference areas form at least three optical measurement paths, and each reference device and the light receiver in the reference area form at least two optical measurement paths; if the central device is a light receiver, if there are three reference devices and there is at least one light transmitter in the reference area, the light transmitter in each reference area can form at least three optical measurement paths.

[0007] According to the first aspect, if the central device is a light transmitter, the reference device is a light transmitter, and the reference area includes a light receiver; the distance between the central device and each adjacent light receiver is different, and the distance between the reference device and each adjacent light receiver is different; if the central device is a light receiver, the reference device is a light receiver, and the reference area includes a light transmitter; the distance between each light transmitter and each adjacent light receiver is different.

[0008] In this way, the distance between each light emitter and each adjacent light receiver is different, so that the light emitter can form optical measurement paths of different lengths. Because it is a differentiated optical measurement path, the PPG module can obtain PPG signals with different vascular positions in skin tissue, different optical penetration depths, and different blood perfusions in terms of measurement signals, thereby improving the accuracy of the PPG module in measuring human body parameters.

[0009] According to the first aspect, each reference area includes N reference devices, where N is an integer greater than 0; the lines connecting the N reference devices and the central device are in the same straight line; the angle formed between each two adjacent reference devices and the central device is divided into two different angles by the lines connecting the N reference devices and the central device.

[0010] In this way, the lines connecting the N reference devices in the reference area and the central device are in the same straight line, so that the reference devices are regularly arranged in the reference area. At the same time, the angle formed between each two adjacent reference devices and the central device is divided into two different angles by the lines connecting the N reference devices and the central device, so that the distances from the reference device to the adjacent reference devices in adjacent positions are different. Regardless of whether the reference device is an optical transmitter or an optical receiver, the lengths of the optical measurement paths formed between the reference devices are different, which can improve the measurement accuracy of the PPG module.

[0011] According to the first aspect, the angle formed between each two adjacent reference devices and the central device is the same; if the central device is a light transmitter, the luminous center of each reference device in at least three different orientations is in the same straight line with the luminous center of the central device; if the central device is a light receiver, the photosensitive center of each reference device in at least three different orientations is in the same straight line with the photosensitive center of the central device. In this way, the angle formed between each two adjacent reference devices and the central device is the same, if the central device is a light transmitter, the reference device is also a light transmitter, and the luminous center of each reference device is in the same straight line with the luminous center of the central device; if the central device is a light receiver, the reference device is also a light receiver, and the photosensitive center of each reference device is in the same straight line with the photosensitive center of the central device, so that the positions of the laid-out reference devices are symmetrical with each other in the entire PPG module, and the symmetrical setting facilitates the flexible adjustment of the length of each optical measurement channel according to measurement requirements.

[0012] According to the first aspect, each reference region includes N reference devices, where N is an integer greater than 0; the lines connecting the N reference devices and the central device are in the same straight line; the angle formed between each two adjacent reference devices and the central device in the reference region is divided into two identical angles by the lines connecting the N reference devices and the central device; if the central device is a light receiver, the light emission center of the light transmitter in the N reference devices is close to the reference device in one of the adjacent orientations; if the central device is a light transmitter, the photosensitive center of the light receiver in the N reference devices is close to the reference device in one of the adjacent orientations. In this way, the angle formed between each two adjacent reference devices and the central device in the reference region is divided into two identical angles by the lines connecting the N reference devices (such as N is 1 or more than 2) and the central device, so that the layout of the reference devices is symmetrical, the photosensitive center or the light emission center in the reference device is close to the reference device in one of the adjacent orientations, so that optical measurement paths of different lengths are formed between the reference device and the reference devices in two adjacent orientations, thereby improving the accuracy of PPG module measurement.

[0013] According to the first aspect, the i-th reference device close to the central device located at different orientations is used as the i-th layer reference device of the PPG module, i is an integer greater than 0; the distance between the central device and each reference device in the i-th layer reference device is equal or unequal; the j-th reference device close to the central device located at different orientations is used as the j-th layer reference device of the PPG module, j is an integer greater than 0, and the reference device includes an optical transmitter or an optical receiver; the distance between the central device and each reference device in the j-th layer reference device is equal or unequal. In this way, multiple layers of reference devices and multiple layers of reference devices can be arranged to improve the flexibility of arranging reference devices and reference devices. At the same time, when the distance between each layer of reference devices / each layer of reference devices is the same, the arranged reference devices are regular, and the regular arrangement makes the layout beautiful, and it is also convenient to calculate the length of each optical measurement path; when the distance between each layer of reference devices / each layer of reference devices is different, it is conducive to improving the flexibility of arranging devices.

[0014] According to the first aspect, if the central device is an optical receiver, when the i-th layer of reference devices is provided, then the (2i-1)-th layer of reference devices and the 2i-th layer of reference devices are provided correspondingly; if the central device is an optical transmitter, when the 2i-th layer of reference devices and the (2i-1)-th layer of reference devices are provided, then the i-th layer of reference devices are provided correspondingly; wherein the distance between each two adjacent layers of reference devices is equal or unequal; the distance between each two adjacent layers of reference devices is equal or unequal. In this way, each layer of reference devices has a corresponding layer of reference devices, for example, the first layer of reference devices corresponds to the first layer of reference devices and the second layer of reference devices, the number of layers of optical transmitters is different from the number of layers of optical receivers, and multiple layers of optical transmitters are provided to improve the flexibility of the layout.

[0015] According to the first aspect, if the central device is a light receiver, the photosensitive center or geometric center of the central device is located outside the connection line between multiple reference devices in the same orientation; if the central device is a light transmitter, the light emitting center or geometric center of the central device is located outside the connection line between multiple reference devices in the same orientation. In this way, since the photosensitive center or geometric center of the central device is located outside the connection line between multiple reference devices in the same orientation or the light emitting center or geometric center of the central device is located outside the connection line between multiple reference devices in the same orientation, the flexibility of arranging the reference devices is further improved.

[0016] According to the first aspect, the reference device in the reference area includes an optical receiver and an optical transmitter; the optical receiver and the optical transmitter located at the same position are arranged in sequence and spaced apart, and the reference device closest to the central device matches the central device to form an optical measurement path. In this way, the optical receiver and the optical transmitter located at the same position are arranged in sequence and spaced apart, and the reference device closest to the central device matches the central device. For example, if the central device is an optical transmitter, the reference device closest to the central device is an optical receiver. If the central device is an optical receiver, the reference device closest to the central device is an optical transmitter. When the central device is an optical receiver, the reference device closest to the central device can form at least 4 optical measurement paths with the adjacent optical receivers. When the central device is an optical transmitter, the central device can form at least 3 optical measurement paths, and the optical transmitter in the reference area can form at least 2 optical measurement paths. That is, this spacing arrangement can further increase the optical measurement paths of the optical transmitter.

[0017] According to the first aspect, the reference devices in each reference area are located at at least 2 different orientations; the lines between the reference devices in each orientation and the central device are in the same straight line; the angle formed between each two adjacent reference devices and the central device is equally divided by the lines between the reference devices in at least 2 different orientations and the central device, or the angle formed between each two adjacent reference devices and the central device is divided into at least 3 different angles by the lines between the reference devices in at least 2 different orientations and the central device.

[0018] In this way, the reference devices in each reference area are located in at least two different orientations. For example, the light transmitter and the light receiver can be set at intervals in the two orientations in the reference device, or both can be set as light transmitters or light receivers, which increases the flexibility of the reference device layout.

[0019] According to the first aspect, the light emitter includes at least two different light-emitting crystals; if the central device is a light-emitting device, the two light-emitting crystals in the reference device are symmetrically arranged based on a center line of the reference device; if the reference device includes a light emitter, the two light-emitting crystals in the reference device are symmetrically arranged based on a center line of the reference device. In this way, the light-emitting crystals are symmetrically arranged, which is conducive to accurate detection of human body parameters. For example, when detecting human blood oxygen, the light emitter includes a red light crystal and an infrared light crystal, and the two crystals are symmetrically arranged.

[0020] According to the first aspect, the geometric center of each reference device is in the same straight line as the geometric center of the central device. In this way, the geometric center of the reference device is in the same straight line as the geometric center of the central device, so that the layout of the deployed central device and the reference device is neat, which is convenient for setting other devices.

[0021] According to the first aspect, if the central device is a light receiver, the photosensitive centers of each reference device at the same orientation are in the same straight line; if the central device is a light transmitter, the light emitting centers of each reference device at the same orientation are in the same straight line. In this way, the photosensitive centers of each reference device at the same orientation are in the same straight line or the light emitting centers of each reference device at the same orientation are in the same straight line, so that the layout of the reference devices is neat, and at the same time, the distance from the light signal emitted by the light transmitter to the light receiver is easy to calculate.

[0022] According to the first aspect, the optical receiver is a wafer structure or a package structure in which a light receiving wafer is packaged; the optical transmitter adopts a package structure or a wafer structure. In this way, the optical receiver or the optical transmitter can adopt a package structure, which makes deployment convenient. Since the wafer structure is small, it can be flexibly arranged in a space-efficient area.

[0023] According to the first aspect, the number of positions where the reference devices are located in each reference region is different. In this way, since the number of positions where the reference devices are located in each reference region is different, the flexibility of deploying the reference devices is further improved. For example, two reference devices in different positions can be arranged in one reference region, one reference device in one position can be arranged in another reference region, and three reference devices in three positions can be arranged in the third reference region.

[0024] According to the first aspect, the lines between the reference devices located at the same number of layers and the reference devices located at the same number of layers enclose a quadrilateral. In this way, the quadrilateral structure further increases the optical measurement paths of the light transmitter, for example, when the central device is a light receiver, the reference device is located at least 4 different positions of the central device, and each light transmitter can form at least 3 optical measurement paths; when the central device is a light transmitter, the reference device is located at at least 4 different positions of the central device, and the central device forms at least 4 optical measurement paths.

[0025] According to the first aspect, the PPG module is deployed in the electronic device; the geometric center of the central device is located at the geometric center of the plane where the PPG module is located; or, the light emitting center of the central device is located at the geometric center of the plane where the PPG module is located; or, the photosensitive center of the central device is located at the geometric center of the plane where the PPG module is located. In this way, the position of the central device is related to the shape of the electronic device, and is set at the geometric center of the plane where the PPG module is located, which facilitates the PPG module to measure human body parameters. For example, if the central device is deployed at the edge of the plane where the PPG module is located, the ambient light received by the optical receiver will increase, resulting in greater sensitivity to ambient light and reduced measurement accuracy.

[0026] According to the first aspect, if the PPG module is used to monitor heart rate, the distance between the optical receiver and the optical transmitter in the PPG module is between [1mm, 10mm]; if the PPG module is used to monitor blood oxygen parameters, the distance between the optical receiver and the optical transmitter in the PPG module is greater than 10mm. In this way, in different measurement scenarios, the distance range between the optical receiver and the optical transmitter is different, and the distance between each optical transmitter and the optical receiver can be set for different measurement ranges.

[0027] In a second aspect, the present application provides a method for measuring a PPG signal, which is applied to an electronic device, wherein the electronic device includes a processor and a PPG module such as the first aspect and any one of the implementations of the first aspect electrically connected to the processor, the method including: obtaining a usage scenario of the electronic device; determining a measurement mode that matches the usage scenario according to the usage scenario of the electronic device; controlling the operation of an optical transmitter according to an indication of the measurement mode, and controlling the connection method of an optical receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode; determining a measurement result of the PPG module according to the PPG signal output by the measurement mode.

[0028] In this way, by adopting the PPG signal measurement method, different measurement modes are started for different usage scenarios (i.e., different LEDs and different PDs are started) through judgment of the scene, instead of using the same measurement method, so as to improve the measurement accuracy and avoid the problem of being unable to monitor human physiological parameters in certain scenarios. For example, in low temperature and high altitude usage scenarios, a high perfusion rate is required, and a long optical measurement path can realize human body monitoring.

[0029] According to the second aspect, the central component of the PPG module is an optical receiver; if the measurement mode is a normal measurement mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection method of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: performing the following processing on each optical transmitter in turn: starting the optical transmitter to emit an optical signal, controlling the optical receivers adjacent to the optical transmitter to be connected in parallel; controlling the parallel optical receivers to receive the PPG signal; and determining the PPG signal output by the measurement mode based on each PPG signal received.

[0030] In this way, in the normal measurement mode, due to the different positions of each light emitter, different PPG signals can be obtained by acquiring the signals emitted by light emitters at different positions. A PPG signal that meets this mode can be selected through multiple PPG signals. Since each light emitter can form at least three optical measurement paths, the measurement accuracy can be improved in this mode.

[0031] According to the second aspect, the central component of the PPG module is an optical receiver; if the measurement mode is the energy-saving mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection method of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: controlling each optical transmitter to be connected in parallel, and lighting up the parallel optical transmitters; controlling each optical receiver to be connected in parallel, and controlling the parallel optical receivers to receive the PPG signal; and using the received optical signal as the PPG signal output by the energy-saving mode.

[0032] In this way, since each optical transmitter is connected in parallel, the power of the optical transmitter can be reduced. Similarly, each optical receiver is connected in parallel, which also reduces the power consumption of the optical receiver, thereby achieving energy-saving measurement.

[0033] According to the second aspect, the central device of the PPG module is an optical receiver; if the measurement mode is a motion measurement mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: lighting each optical transmitter in turn, and controlling the central device to receive each PPG signal in turn; changing the connection mode between each optical transmitter to parallel, and controlling the central device to receive the PPG signal; changing the connection mode of each optical receiver to parallel; lighting each optical transmitter, and controlling each parallel optical receiver to receive the PPG signal; obtaining the optimal PPG signal from each received PPG signal as the PPG signal in the motion measurement mode. In this way, since the sensor will be displaced, flipped, and shaken in the motion state, resulting in optical crosstalk, in the motion scene, multiple measurements can be performed to obtain different PPG signals. At the same time, the central device is located at the center of the plane where the PPG module is located, and the center position is less affected by the displacement, flipping, and shaking of the PPG module, thereby improving the accuracy of measurement in the motion state.

[0034] According to the second aspect, the central component of the PPG module is an optical receiver; if the measurement mode is a measurement mode corresponding to a low temperature and high altitude scene, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: lighting up each optical transmitter in turn, and controlling the optical receiver adjacent to the optical transmitter and farthest from the light emitting center of the optical transmitter to receive the PPG signal; changing the connection mode between each transmitter to parallel and changing the connection mode of each optical receiver to parallel; lighting up each optical transmitter, and controlling each parallel optical receiver to receive the PPG signal; obtaining the optimal PPG signal from each received PPG signal as the PPG signal in the measurement mode corresponding to the low temperature and high altitude scene. In this way, the long optical measurement channel has a higher pulse signal perfusion rate, and the short optical measurement signal channel has a higher signal energy. When it is determined that the electronic device is in a low temperature and high altitude environment, a high perfusion rate is required, and an optical measurement path with a long path is obtained so that it has a high perfusion rate, thereby improving the accuracy of the PPG module measurement.

[0035] According to the second aspect, the measurement result of the PPG module is determined according to the PPG signal output in the measurement mode, including: judging whether the PPG signal output in the measurement mode meets the preset measurement conditions; if it is determined to be satisfied, the output PPG signal is used as the measurement signal; if it is determined not to be satisfied, the PPG signal corresponding to each optical measurement channel in each measurement mode is obtained, and the optimal signal is obtained from each obtained PPG signal as the measurement signal; the measurement result is calculated according to the measurement signal. In this way, the use of PPG signals whose signal quality does not meet the conditions can be avoided, thereby avoiding the problem of inaccurate measurement results.

[0036] According to the second aspect, before obtaining the usage scenario of the electronic device, the method also includes: controlling each optical receiver to receive ambient light; determining the first posture of the electronic device according to the ambient light; obtaining the wearing posture of the electronic device according to the first posture; when the wearing posture does not meet the preset measurement posture, outputting prompt information to instruct the user to adjust the wearing posture of the electronic device. In this way, since the wearing posture of the electronic device will affect the measurement of the PPG module (such as causing the ambient light to increase and reducing the accuracy of the PPG module measurement), the user can be prompted to adjust the wearing posture of the electronic device in time, which can improve the accuracy of the PPG module in measuring human body parameters.

[0037] According to the second aspect, before determining the first posture of the electronic device according to the ambient light, the method further includes: determining the second posture of the electronic device according to the posture sensor; determining the wearing posture of the electronic device according to the ambient light includes: determining the wearing posture of the electronic device according to the first posture and the second posture. In this way, the second posture of the electronic device can be determined by the sensor, and the wearing posture of the electronic device can be determined by the first posture and the second posture, which can improve the accuracy of the determined wearing posture of the electronic device.

[0038] In a third aspect, the present application provides an electronic device, including: one or more processors; a memory; and one or more computer programs, wherein the one or more computer programs are stored in the memory, and when the computer programs are executed by the one or more processors, the electronic device executes the PPG signal measurement method of the second aspect and any one of the implementations of the second aspect. The technical effects corresponding to the implementation of the third aspect can refer to the technical effects corresponding to any one of the implementations of the first aspect and the second aspect above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0040] Figure 1 is a schematic diagram showing an exemplary layout of a PPG module;

[0041] Figure 2 is a schematic diagram showing an exemplary layout of a PPG module including three LEDs;

[0042] Figure 3 is a schematic diagram showing an exemplary process of layout of a PPG module;

[0043] Figure 4 is a schematic diagram showing the layout of another PPG module;

[0044] Figure 5 is a schematic diagram exemplarily showing a case where a light emitter includes a plurality of wafers;

[0045] Figure 6 is a schematic diagram showing an exemplary arrangement of a PPG module with two levels of LEDs;

[0046] Figure 7 is a schematic diagram exemplarily showing that the number of layers of the optical receiver and the number of layers of the optical transmitter are both multiple layers;

[0047] Figure 8 is a schematic diagram showing an exemplary layout of a PPG module;

[0048] Fig. 9 is a schematic diagram exemplarily showing that an angle formed between two adjacent reference devices and a central device is divided into two different angles by a line connecting the reference device and the central device;

[0049] Fig.10 is a schematic diagram exemplarily showing a reference region including reference devices located at multiple positions;

[0050] Fig.11 is a schematic diagram of a PPG module in which a central device is an optical transmitter;

[0051] Fig.12 is a schematic diagram showing an exemplary quadrilateral surrounded by lines between a benchmark device located at the same number of layers and a reference device located at the same number of layers;

[0052] Fig.13 is a schematic diagram of various optical measurement paths of a PPG module shown as an example;

[0053] Fig.14 is a schematic diagram of various optical measurement paths of a PPG module shown as an example;

[0054] Fig.15a is a schematic diagram showing an exemplary wearing posture of a smart watch;

[0055] Fig.15b is a schematic diagram exemplarily showing a scene after a user adjusts the wearing posture of a smart watch;

[0056] Fig.16 is a schematic diagram showing an exemplary process of the smart watch in FIG15 monitoring human physiological parameters;

[0057] Fig.17 is a schematic diagram exemplarily showing a specific process of an electronic device acquiring a PPG signal output by a PPG module in a current usage scenario of the electronic device;

[0058] Fig.18 is a schematic diagram showing an exemplary process of the PPG module collecting PPG signals when the electronic device is in a static state;

[0059] Fig.19 is a schematic diagram showing an exemplary process of the PPG module collecting PPG signals when the electronic device is in motion;

[0060] Fig. 20It is a schematic diagram showing an example of a process of collecting PPG signals by the PPG module when the electronic device is in a low temperature and high altitude state. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] The term "and / or" in this article is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0063] The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects rather than to describe a specific order of objects. For example, a first target object and a second target object are used to distinguish different target objects rather than to describe a specific order of target objects.

[0064] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0065] In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more than two. For example, multiple processing units refer to two or more processing units; multiple systems refer to two or more systems.

[0066] In the embodiment of the present application, the PPG module includes a light transmitter and a light receiver (such as a PD). The light transmitter LED can emit green light, and the light receiver is used to receive the light emitted by the LED. Figure 1 A PPG module is shown. Figure 1 As shown in the figure, the hollow circle is the LED. The LED and PD are set on the PCB board. In this example, the PCB board is as follows Figure 1 The PD is set at the center of the circular PCB board, and 6 LEDs are evenly surrounded by the PD. Figure 1 In the PPG module with the middle layout, only one PD receives the light from the LED, that is, this layout has only 6 optical measurement channels, resulting in low light efficiency and high power consumption of the PPG module.

[0067] The embodiment of the present application provides a layout method of PD and LED in a PPG module, so that the PPG module can effectively improve optical efficiency and reduce power consumption; at the same time, by adopting this layout method, the measurement method can be flexibly adjusted according to measurement requirements, thereby enhancing the applicability of the PPG module.

[0068] In the present application, the PPG module can be set in an electronic device, and the electronic device can be a wearable device, such as a smart watch, a bracelet, an arm bag, etc. Of course, the electronic device can also be other devices, such as a human physiological parameter measurement device, etc. The embodiment of the present application does not limit the specific form of the electronic device. For the convenience of explanation, the following description takes the electronic device as a smart watch as an example.

[0069] A smart watch may include a mainboard, a display screen, a battery, and the like. Among them, a processor, an internal memory, a charging circuit, and the like may be integrated on the mainboard. Of course, the smart watch may also include other components, and other circuit structures may also be integrated on the mainboard, which is not limited in the embodiments of the present application. The charging circuit of the mobile phone includes a power management circuit and a charging management circuit. The power management circuit connects a lithium battery, a charging management circuit, and a processor. The internal memory in the smart watch can be used to store computer executable program codes, and the executable program codes may include instructions. The processor executes various functional applications and data processing of the mobile phone by running the instructions stored in the internal memory. The above-mentioned processor, internal memory, charging circuit, etc. integrated on the mainboard include one or more chips.

[0070] In the present application, the PPG module includes an optical transmitter and an optical receiver. The optical transmitter may be an LED. The optical receiver may be used to receive light emitted by the optical transmitter. The optical receiver may be a PD, a photoresistor, a phototransistor, a photoelectric converter, etc. In the present application, the optical receiver takes a PD as an example. The optical transmitter may or may not adopt a packaging structure. The optical receiver may or may not adopt a packaging structure.

[0071] In one embodiment, the PPG module includes: a plurality of LEDs and a plurality of PDs, and the plurality may be 3 or more. For example, the PPG module includes 4 PDs and 3 LEDs; or, the PPG module includes 3 PDs and 4 LEDs. In the following, the present application takes the layout of the PPG module including at least 3 LEDs as an example. Figure 2 A schematic diagram of the layout of a PPG module including three LEDs in the present application is shown.

[0072] like Figure 2As shown, the PPG module includes 3 LEDs and 4 PDs. The LEDs and PDs are both arranged on a PCB board 20. The shape of the PCB board 20 can be set according to the shape of the electronic device. In this example, the electronic device is circular, and the PCB board 20 can also be set to a circular shape. Optionally, the PCB board 20 can also be other shapes, such as a direction, a diamond, etc., which are not listed here one by one.

[0073] In this example, if the PCB board has the same shape as the electronic device (such as a smart watch), PD201 can be set at the center of the PCB board 20 (i.e., the plane where the PPG module is located), and three PDs, i.e., PD202, PD203, and PD204, are distributed around the PD201. The PD202, PD203, and PD204 are arranged on the periphery of PD201 and are located in different directions. LEDs are arranged between the surrounding PDs, i.e., LED301 is arranged between PD202 and PD204, LED302 is arranged between PD202 and PD203, and LED303 is arranged between PD204 and PD203.

[0074] It should be noted that, in this example, the LED and the PD may adopt a packaging structure, such as a SIP package (System In a Package).

[0075] In this example, three LEDs (i.e., LED 301, LED 302, and LED 303) and three PDs (i.e., PD202, PD203, and PD204) are arranged around PD201, and the three PDs around PD201 are spaced apart from the three LEDs around PD201. This layout enables each LED to be adjacent to three PDs, and each light emitter can generate at least three optical measurement paths, thereby improving the optical efficiency of the light emitter.

[0076] Figure 3 For example, Figure 2 The schematic diagram of the layout process of the PPG module in Figure 3 , specify the Figure 2 Layout method.

[0077] Specifically, a position in the PCB can be selected to set the central device according to the shape of the electronic device. Optionally, the central device can also be deployed at any position on the PCB board. In this example, the central device is deployed on a PCB board corresponding to the center of the dial. For example, if the dial of a smart watch is circular, the shape of the PCB board is the same as the shape of the dial, and the PCB board is arranged relative to the dial, then it can be determined to set the central device on the PCB board corresponding to the center of the circular dial. Figure 3As shown in 3a, the shape of the dial is the same as the shape of the PCB board, and the center of the dial coincides with the center of the PC board, and a central component is set at the center of the circular PCB board 20 (when the PCB board is circular, the center coincides with the geometric center of the PCB board).

[0078] Optionally, the central device can be a PD or an LED, and the central device can be one or more. In this example, the central device takes PD as an example, and the photosensitivity center of the PD201 can be set at the geometric center of the PCB board 20. The geometric center of the PD201 can also be set at the geometric center of the PCB board 20. Optionally, in this example, the coincidence of the photosensitivity center of PD201 and the geometric center of PCB board 20 is taken as an example. By setting the central device, the layout center of the current PPG module can be determined, and other PD devices or LED devices are arranged based on the location of the central device, so that the device layout in the PPG module is more regular.

[0079] In this example, the geometric center or photosensitive center of the central device (i.e., PD201) is used as the origin to construct multiple virtual reference axes. The position of the reference axis can be used to deploy the reference device, and the type of the reference device is the same as that of the central device. The position of the reference axis is used to deploy the reference device, that is, the reference device is arranged based on the reference axis, so that the area where the reference device is deployed can be quickly determined through the reference axis, thereby speeding up the deployment of the reference device.

[0080] Multiple reference axes can divide the PCB board 20 into multiple parts. The multiple virtual reference axes can be 3 or more. In this example, 3 reference axes are used as an example for explanation. Figure 3 As shown in 3a in FIG. 3 , three reference axes are constructed so that the three reference axes evenly divide the PCB board 20 , such as the reference axis 401 , the reference axis 402 , and the reference axis 403 shown in 3a . The three reference axes converge at the photosensitivity center of the PD 201 and evenly divide the PCB board 20 .

[0081] Optionally, the angle between every two reference axes may be equal or unequal, that is, the angle formed between every two adjacent reference devices and the central device may be equal or unequal. For example, the angle between the reference axis 401 and the reference axis 403 in 3a is not equal to the angle between the reference axis 401 and the reference axis 402.

[0082] A virtual reference axis is constructed between two adjacent reference axes (i.e., the position of the angle space formed by two adjacent reference devices among the three reference devices and the central device). The reference axis is used to assist in the deployment of reference devices. The type of reference device can be the same as that of the central device, or it can be different from the type of the central device. For example, the reference device can be deployed along the extension direction of the reference axis, or it can be deployed at a position adjacent to the reference axis. By using the position of the reference axis, the area where the reference device is deployed can be narrowed, and the time to determine the area where the reference device is deployed can be reduced.

[0083] The convergence point of each reference axis can be the same as the convergence point of each reference axis, or it can be different from the convergence point of each reference axis. In this example, the convergence point of each reference axis is the same as the convergence point of each reference axis, that is, each reference axis converges at the geometric center or photosensitive center of the central device PD201, such as Figure 3 As shown in 3b, a reference axis 501 is constructed between the reference axis 401 and the reference axis 403. A reference axis 402 is constructed between the reference axis 401 and the reference axis 402, and a reference axis 503 is constructed between the reference axis 402 and the reference axis 403. An angle θ1 is formed between the reference axis 501 and the reference axis 401, an angle θ2 is formed between the reference axis 402 and the reference axis 502, and an angle θ3 is formed between the reference axis 403 and the reference axis 503. Optionally, the angle θ1, the angle θ2, and the angle θ3 may be the same or different, that is, the reference axis and the adjacent reference axis may form an angle of any angle. In this example, the angle θ1, the angle θ2, and the angle θ3 are the same as an example.

[0084] like Figure 3As shown in 3b, a PD device is arranged along the extending direction of the reference axis 401, the reference axis 402 and the reference axis 403 respectively, and the arranged PD devices are in the area of ​​the PCB opposite to the circular dial. Optionally, the reference axis can pass through the photosensitive center or geometric center of the PD device arranged in the extending direction of the reference axis, and converge at the geometric center or photosensitive center of the central device 201; the reference axis coincides with the center line of the PD device. As shown in 3c, PD202 is set at the position of the reference axis 401, so that the reference axis 401 can pass through the photosensitive center of PD202 and the reference axis 401 coincides with a center line of PD202. Similarly, PD204 can be set at the position of the reference axis 402, the photosensitive center of PD204 is located on the reference axis 402, and the reference axis 402 coincides with a center line of PD203; PD203 is set at the position of the reference axis 403, and the photosensitive center of PD203 is located on the reference axis 403, and the reference axis 403 coincides with the photosensitive center of PD203. In this embodiment, the device type on each reference axis is the same, and the device on the reference axis is the same as the type of the central device. In this example, the devices on the reference axis do not include the central device. Optionally, the number of devices on each reference axis is greater than or equal to 1.

[0085] During the layout process, the central device can be called the zero-level device (or the zero-layer device), and the PD202, PD203 and PD204 serve as the first-level PD devices (or first-layer PD devices, first-layer reference devices) of the PPG module. The distance between each PD in the first-level PD devices and the central device can be the same or different. The distance between each PD in the first-level PD devices and the central device can be set based on the measurement requirements, which is not limited in this example. Optionally, the distance between each PD in the first-level PD devices and the central device can be the distance between the photosensitivity center of each PD in the first-level PD devices and the photosensitivity center of the central device, or the distance between the geometric center of each PD in the first-level PD devices and the geometric center of the central device. In this example, the distance between each PD in the first-level PD devices and the central device takes the distance between the photosensitivity center of each PD and the photosensitivity center of the central device as an example. As shown in 3d, the first-level PD devices include PD202, PD203 and PD204, and the photosensitivity center of the central device PD201 is Figure 3 The black center dot in 3D. Except for the zeroth layer device, the distances from other devices on the same layer number to the center device can be the same or different according to different functional requirements.

[0086] For example, Figure 3As shown in 3d, the distance between the photosensitive center of PD203 and the photosensitive center of PD201 is shown as d1 in 3d. The distance between the photosensitive center of PD202 and the photosensitive center of PD201 is shown as d2 in 3d. The distance between the photosensitive center of PD204 and the photosensitive center of PD201 is shown as d3 in 3d, and d1, d2 and d3 may be equal or not.

[0087] After determining the first-level PD device, the light emitter in the PPG module can be arranged based on the reference axis. In this example, the light emitter can be an LED, which can include a light-emitting die, which can emit red light, green light, or blue light. In this example, Figure 3 As shown in 3e, the LEDs are arranged along the direction in which the reference axis extends, and the geometric centers of the arranged LEDs are located on the reference axis, such as the geometric center of LED 301 is located on the reference axis 502, the geometric center of LED 302 is located on the reference axis 501, and the geometric center of LED 303 is located on the reference axis 503. Optionally, the photosensitive centers of the LEDs arranged along the direction in which the reference axis extends can be located on the reference axis. Figure 3 Optionally, the devices arranged along the extension direction of the reference axis can be arranged according to measurement requirements, for example, the devices arranged along the extension direction of the reference axis can be a combination of multiple light-emitting wafers.

[0088] In the direction of the reference axis and the reference axis, the device closest to the center device is the first-level device (or the first-layer device), and so on, from the inside to the outside are the second-level devices and the third-level devices, which can increase step by step. The LED301, LED302 and LED303 are the first-level LED devices (or the first-layer LED devices, the first-layer reference devices) of the PPG module. The distance from each LED in the first-level LED devices to the center device can be the same or different. Optionally, the distance between each LED in the first level and the center device can be the distance between the photosensitive center of each LED in the first level and the photosensitive center of the center device, or the distance between the geometric center of each LED in the first level and the geometric center of the center device. In this example, the distance between each LED in the first layer and the center device is taken as the distance between the geometric center of each LED in the first layer and the geometric center of the center device. As shown in 3f, the first-level LED devices include LED301, LED302 and LED303, and the geometric center of the center device PD201 is the black center dot in 3f. The distance between the geometric center of the LED 302 and the geometric center of the PD 201 is shown as d4 in 3f. The distance between the geometric center of the LED 303 and the geometric center of the PD 201 is shown as d5 in 3f. The distance between the geometric center of the LED 301 and the geometric center of the PD 201 is shown as d6 in 3f, and d4, d5 and d6 may be equal or unequal. Optionally, d1, d2, d3, d4, d5 and d6 may be equal or unequal.

[0089] This embodiment specifically describes Figure 2 The layout process of PD and LED in the PPG module shown in FIG. In this embodiment, a reference axis is first determined based on the central device (as shown in 3a), and there is at least one reference axis between adjacent reference axes. The PD and LED devices in the PPG module are arranged from the inside to the outside along the reference axis or along the extension direction of the reference axis. This layout method is quick.

[0090] In this example, the angles between adjacent reference axes are the same, and the geometric center / photosensitive center of the PD is located on the reference axis, so that the positions of the devices arranged based on the reference axis are symmetrical in the entire PPG module. The symmetrical setting facilitates flexible adjustment of the lengths of each optical measurement channel according to measurement requirements. At the same time, after determining the reference axis, the layout framework of the PPG module is determined. Since the reference axis is set based on the reference axis, the area where the remaining devices are arranged is further determined in the layout framework, which reduces the scope of the layout of the remaining devices and speeds up the layout. In this example, Figure 2 , Figure 33e, the central device is a PD, and the PDs and LEDs surrounding the central device are arranged at intervals, so that each LED in the PPG module can form an optical measurement path with the surrounding PDs, that is, each LED has 3 optical measurement channels. Under the condition of the same number of PDs, the optical efficiency is improved and the power consumption is reduced. The devices located on the reference axis can be symmetrically arranged based on the reference axis. The layout of the symmetrically arranged devices is simple and more in line with the appearance requirements of the user. In addition, in the traditional PPG module layout, each LED can only be combined with a specific PD to form an optical measurement path. The remaining PDs are far apart, causing the light energy to be absorbed and unable to be effectively measured. By adopting the layout method in the present application, when the angles between the reference axes are the same and the angles formed by each adjacent reference axis and the reference axis are the same, optical paths of the same length or optical measurement channels of equal signal energy levels can be formed, thereby avoiding the problem that the optical energy of the LED light source is completely absorbed and cannot be effectively received by the PD device due to the optical path being too long.

[0091] In some embodiments, the LED package structure may include multiple light-emitting die, for example, the LED on the reference axis may also include two light-emitting die. Optionally, the colors of the multiple light-emitting die in the LED package may be different, for example, one light-emitting die is a red light die, and the other is an infrared light die.

[0092] Figure 4 The schematic diagram of the layout of another PPG module is shown as an example, in which the LED package of the PPG module includes a plurality of light-emitting wafers.

[0093] like Figure 4 As shown, three reference axes and three reference axes can be constructed in the PPG module. The reference axes include: reference axis 401, reference axis 402 and reference axis 403, and the angle between adjacent reference axes can be 120 degrees. The reference axes include: reference axis 501, reference axis 502 and reference axis 503, and the angle between each reference axis and the adjacent reference axis can be 60 degrees. The construction process of the reference axis and the reference axis is the same as Figure 3 The construction process is similar to that in Figure 3The relevant descriptions in 3a and 3b will not be repeated here. PD is arranged along the direction in which the reference axis extends, and the geometric center or the photosensitive center of the arranged PD is located on the reference axis. The PD2, PD3 and PD4 form the peripheral distribution device of the PPG module. LED is arranged along the direction in which the reference axis extends. The LED may include two light-emitting crystals, such as LED305 includes light-emitting crystal 3051 and light-emitting crystal 3052. The light emitted by the light-emitting crystal 3051 and the light-emitting crystal 3052 may be different. For example, the light-emitting crystal 3051 may be an infrared light crystal or a red light crystal, or the light-emitting crystal 3052 may be a red light crystal or an infrared light crystal. In this example, the light-emitting crystal 3051 takes a red light crystal as an example, and the light-emitting crystal 3052 takes an infrared light crystal as an example. The red light crystal and the infrared light crystal are used in conjunction with the PD, so that the PPG module can monitor the blood oxygen of the human body.

[0094] like Figure 4 As shown, the positions of light emitting wafers 3051 and 3052 are symmetrically arranged with reference axis 501 as the symmetry axis. Similarly, the two light emitting wafers in LED 304 are symmetrically arranged with reference axis 502 as the symmetry axis; and the two light emitting wafers in LED 306 are symmetrically arranged with reference axis 503 as the symmetry axis.

[0095] Optionally, the position of the light emitting wafer 3051 and the position of the light emitting wafer 3052 may not be symmetrically arranged based on the reference axis 501 as the axis of symmetry.

[0096] In this example, the angles between adjacent reference axes are the same, and the angles between the reference axis and the adjacent reference axis are also the same. The light-emitting die in the LED includes two light-emitting die, such as a red light die and an infrared light die. When the two die in the LED are symmetrically arranged with the reference axis as the symmetry axis, the light-emitting arrangement of the two light sources in the LED is symmetrical, and a light measurement path with the same length of travel distance as the adjacent PD device can be obtained.

[0097] In some embodiments, the LED may further include three types of wafers, such as a green wafer, a red wafer, and an infrared wafer. Figure 5As shown in 5a, the PPG module includes a reference axis 401, a reference axis 402, a reference axis 403, a reference axis 501, a reference axis 502, and a reference axis 503. PDs (such as PD202, PD203, and PD204) are arranged along the direction in which the reference axis extends, and the geometric center or photosensitive center of the arranged PDs is located on the reference axis. LEDs (such as LED307, LED308, and LED309) are arranged along the direction in which the reference axis extends. In this example, LED307, LED308, and LED309 are of the same type, and all include three light-emitting crystals. In this example, LED308 is taken as an example for explanation. For example, light-emitting crystal 3081 is a red light crystal, light-emitting crystal 3082 is an infrared light crystal, and light-emitting crystal 3083 is a green light crystal. In this example, light emitting wafer 3082 and light emitting wafer 3081 in LED 308 are symmetrical with reference axis 501, and the photosensitive center of light emitting wafer 3083 is located on reference axis 501. LED 307 and LED 309 are similar to LED 308 and will not be described again.

[0098] Optionally, in some embodiments, SIP packaging can also be used to install the current layout to package the PD device and the LED device to form a complete module.

[0099] In this example, the LED includes more than three light-emitting crystals. For example, the green crystal can monitor the human heart rate, while the red light crystal and the infrared light crystal can be used together to monitor the human blood oxygen. Through multiple crystals, the PPG module can monitor multiple human physiological parameters, enrich the monitoring content of the PPG module, and enrich the use scenarios of the PPG module.

[0100] In some embodiments, LEDs and PDs may also be in a wafer structure, i.e., a non-packaged mode. Figure 5 As shown in 5b, the PPG module includes reference axis 401, reference axis 402, reference axis 403, reference axis 501, reference axis 502 and reference axis 503. PDs (such as PD2021, PD2031 and PD2041) are arranged along the direction in which the reference axis extends, and the geometric center or photosensitive center of the arranged PD is located on the reference axis. Three types of wafers are arranged along the direction in which the reference axis extends, and the three types of wafers are arranged independently on the PCB board 20.

[0101] Exemplarily, the light-emitting crystal element 3081 may be a red light crystal element, the light-emitting crystal element 3082 may be an infrared light crystal element, and the light-emitting crystal element 3083 may be a green light crystal element. In this example, similar to 5a, the light-emitting crystal element 3082 and the light-emitting crystal element 3081 are symmetrical to each other with the reference axis 501 as the axis of symmetry. The photosensitive center of the light-emitting crystal element 3083 is located on the reference axis 501. Similarly, the light-emitting crystal element 3072 and the light-emitting crystal element 3071 are symmetrical to each other with the reference axis 502 as the axis of symmetry. The photosensitive center of the light-emitting crystal element 3073 is located on the reference axis 502. The light-emitting crystal element 3092 and the light-emitting crystal element 3091 are symmetrical to each other with the reference axis 503 as the axis of symmetry. The photosensitive center of the light-emitting crystal element 3093 is located on the reference axis 503.

[0102] In this example, both PD and LED use a wafer structure. Since the wafer structure has no packaging, the positional relationship between the wafers can be flexibly set. At the same time, the wafer is small in size, which makes the PPG module small in size.

[0103] In some embodiments, the number of layers of PDs arranged on the reference axis may be different from the number of layers of LEDs arranged based on the reference axis.

[0104] Figure 6 FIG. 1 shows a schematic diagram of a PPG module with two levels of LEDs. Figure 6 As shown in 6a, the central device is PD201, and PD202, PD203 and PD204 are arranged along the reference axis direction respectively (the reference axis is not shown in 6a). The PD202, PD203 and PD204 are the first-level PD devices of the PPG module. The LEDs are arranged along the extension direction of the reference axis, and each reference axis may include 2 LEDs. The LED310, LED312 and LED314 form the first-level LED devices, and LED311, LED313 and LED315 form the second-level LED devices. Among them, the light-emitting crystals of the LED devices of each level can be consistent. For example, the light-emitting crystals in LED313 are the same as the light-emitting crystals in LED312 (such as green light crystals).

[0105] In another example, the light emitting die in each level of LED device may be different. Figure 6As shown in 6b, the first-level PD devices in the PPG module include PD202, PD203 and PD204. LED318 and LED319 are arranged along the extension direction of the reference axis 501, and LED319 includes a light-emitting crystal 3191 and a light-emitting crystal 3192. LED318 includes a light-emitting crystal, and optionally, LED318 emits green light. Similarly, LED316 and LED317 are arranged along the extension direction of the reference axis 502, and the structure of LED316 is the same as that of LED319. LED320 and LED321 are arranged along the extension direction of the reference axis 503, and the structure of LED321 is the same as that of LED319. LED316, LED318 and LED320 form the first-level LED devices, and LED317, LED319 and LED321 form the second-level LED devices.

[0106] The PPG module in this example includes a first-level PD device, a first-level LED device, and a second-level LED device, that is, the number of layers of light emitters and the number of layers of light receivers are different, and multiple layers of light emitters are set to improve the flexibility of the layout. If the LED layout is concentrated, the optical signal interference and absorption caused by skin hair, moles, scars, tattoos, etc. will lead to the absorption of optical signals, resulting in monitoring failure. In this example, the LED and PD devices form a decentralized layout, which effectively performs a large-scale optical penetration of the measured part, can improve the concentration of devices, and at the same time, due to the decentralized layout of LED devices, it helps to disperse the heat of the devices, improve the temperature characteristics of the PPG module, and avoid harmful temperature rise caused by energy concentration. In traditional PPG modules, the optical measurement path is single and cannot cover a larger skin area, which is easily affected by the difference in skin quality at the measurement point; or the LED devices are centralized, causing the problem of heat accumulation in the PPG module.

[0107] In another embodiment, the number of layers of the optical receiver and the number of layers of the optical transmitter can both be multiple layers. Figure 7 As shown, the reference axis 401, the reference axis 402 and the reference axis 403 in 7a divide the PCB board 20 into three parts of equal size. PD202 and PD206 can be arranged along the direction in which the reference axis 401 extends. PD204 and PD207 can be arranged along the direction in which the reference axis 402 extends. PD203 and PD206 can be arranged along the direction in which the reference axis 403 extends. The distance between two adjacent PDs on the reference axis can be equal or unequal, for example, the distance between PD202 and PD206 can be equal to the distance between PD202 and PD201, or the distance between PD202 and PD206 is not equal to the distance between PD202 and PD201.

[0108] After setting up the first-level PD devices and the second-level PD devices, you can follow the steps below: Figure 7 As shown in 7b, the first-level LED devices, the second-level LED devices, the third-level LED devices and the fourth-level LED devices are arranged based on the reference axis. Specifically, as shown in 7b, LED326, LED327, LED328 and LED329 can be arranged along the direction extending along the reference axis 501, wherein LED326 and LED327 are used to monitor different physiological parameters of the human body. For example, LED326 can emit green light for monitoring the heart rate of the human body, and LED327 includes two red light crystals and infrared light crystals, which can be used to monitor the blood oxygen of the human body. Similarly, LED322, LED323, LED324 and LED325 can be arranged along the direction extending along the reference axis 502, and LED330, LED331, LED332 and LED333 can be arranged along the direction extending along the reference axis 503. In this example, the first-level LED devices include: LED326, LED322, LED330. The second-level LED devices include: LED327, LED323, LED331; the third-level LED devices include: LED328, LED324, LED332; the fourth-level LED devices include: LED329, LED325, LED333.

[0109] In one embodiment, the multilayer devices arranged based on the reference axis can be different device types. Figure 8 As shown, the PPG module includes: reference axis 401, reference axis 402 and reference axis 403, the three reference axes equally divide the PCB board 20, reference axis 501, reference axis 502 and reference axis 503, and a reference axis is constructed between adjacent reference axes. The construction process of the reference axis and the reference axis is the same as Figure 3 The construction process is similar to that in Figure 3 The relevant descriptions in 3a and 3b will not be repeated here. PDs are arranged along the direction in which the reference axis extends, and the geometric center or photosensitive center of the arranged PDs is located on the reference axis. For example, Figure 8PD203, PD202 and PD204 are arranged in the middle. LED312, PD335 and LED313 are arranged in sequence along the direction in which the reference axis 501 extends. LED310, PD334 and LED311 are arranged in sequence along the direction in which the reference axis 502 extends. LED314, PD336 and LED315 are arranged in sequence along the direction in which the reference axis 503 extends. The distance between two adjacent devices on the reference axis can be the same or different. For example, the distance between LED310 and PD334 is equal to the distance between PD334 and LED311. Optionally, the distance between the first layer of devices and the center device on the reference axis can be set according to measurement requirements.

[0110] In some embodiments, the angle between each reference axis and the reference axis may be different. Fig. 9 As shown in FIG9a, the PPG module includes a central device 201, a reference axis 401, a reference axis 402 and a reference axis 403, and the three reference axes evenly divide the PCB board 20; reference axes are constructed between adjacent reference axes, such as reference axis 501, reference axis 502 and reference axis 503. The construction process of the reference axis and the reference axis is similar to Figure 3 The construction process is similar to that in Figure 3 The relevant descriptions in 3a and 3b will not be repeated here. PD202 is set along the extension direction of the reference axis 401; PD204 is set along the extension direction of the reference axis 402; PD203 is set along the extension direction of the reference axis 403. The angle α between the reference axis 501 and the reference axis 401, the angle β between the reference axis 502 and the reference axis 401, and the angle γ between the reference axis 503 and the reference axis 402. The angle α is not equal to the angle β, and the angle β is not equal to the angle γ, that is, the angle α, the angle β and the angle γ are not equal. As Fig. 9 As shown in FIG9b, LED 301 is arranged along the direction in which the reference axis 502 extends, LED 302 is arranged along the direction in which the reference axis 501 extends, and LED 303 is arranged along the direction in which the reference axis 503 extends; forming a PPG module as shown in FIG9b.

[0111] Use Fig. 9 The layout of the PPG module shown in b, due to the different angles between the reference axis and the two adjacent reference axes, enables the LED whose geometric center / photosensitive center is located on the reference axis to generate optical measurement channels of different lengths. The differentiated optical path channels enable PPG signals of different vascular positions in skin tissue, different optical penetration depths, and different blood perfusions to be obtained when measuring signals.

[0112] In another embodiment, other layouts may be used to obtain differentiated light paths of LEDs. Fig. 99c is a layout diagram. A central device PD201 is arranged at the center position of the PPG module (i.e., the geometric center position of the PCB board 20). The PPG module also includes reference axes 401, 402, and 403; reference axes 501, 502, and 503 during the layout process. The construction process of the reference axes and reference axes is the same as Figure 3 The construction process is similar to that in Figure 3 The relevant descriptions in 3a and 3b will not be repeated here. PD202 is set along the extension direction of the reference axis 401; PD204 is set along the extension direction of the reference axis 402; PD203 is set along the extension direction of the reference axis 403. The reference axis is used to assist in determining the position of the LED layout. In this example, the position of the LED can be determined at a position close to the reference axis and the PPG measurement requirements.

[0113] For example, the PPG measurement requirement includes measuring heart rate. When measuring heart rate, the LED needs to be set away from the PD. LED 302 is set along the direction in which reference axis 501 extends and at a position on one side that deviates from reference axis 501. LED 301 is set along the direction in which reference axis 502 extends and at a position on one side that deviates from reference axis 502. LED 303 is set along the direction in which reference axis 503 extends and at a position on one side that deviates from reference axis 503. In this example, no device is arranged at the position where the reference axis is located.

[0114] It should be noted that, in this example, the angle between the reference axis and the adjacent reference axis can be the same or different.

[0115] Since the LED is not arranged in the extension direction of the reference axis, the LED can also generate optical measurement channels of different lengths to form differentiated optical paths, so that the PPG signals obtained are diverse, which can improve the accuracy of heart rate measurement.

[0116] In the above embodiments, one reference axis is constructed between two adjacent reference axes. In some embodiments, multiple (eg, 2 or more) reference axes may be constructed between two adjacent reference axes.

[0117] For example, if Fig.10 As shown in 10a, the central device (PD201) of the PPG module is arranged at the geometric center of the PCB board 20. The PPG module also includes constructing reference axis 401, reference axis 402 and reference axis 403 during the layout process. In this example, the angles between adjacent reference axes are the same. Two reference axes can be constructed between two adjacent reference axes, such as Fig.10As shown in FIG. 10 a , reference axis 501 and reference axis 504 are constructed between reference axis 401 and reference axis 403 . Reference axis 502 and reference axis 505 are constructed between reference axis 401 and reference axis 402 ; and reference axis 503 and reference axis 506 are constructed between reference axis 402 and reference axis 403 .

[0118] PD202 is arranged along the extension direction of the reference axis 401; PD204 is arranged along the extension direction of the reference axis 402; PD203 is arranged along the extension direction of the reference axis 403. The process of arranging PD devices on the reference axis can refer to Figure 3 The relevant description of 3c is not repeated here. LED305 is arranged along the extension direction of reference axis 501; LED302 is arranged along the extension direction of reference axis 504; LED301 is arranged along the extension direction of reference axis 505; LED304 is arranged along the extension direction of reference axis 502; LED303 is arranged along the extension direction of reference axis 503; LED306 is arranged along the extension direction of reference axis 506. The process of arranging LED devices along the reference axis can be referred to Figure 3 The relevant description of 3e will not be repeated here.

[0119] Optionally, the number of reference axes between each two adjacent reference axes may also be different. Fig.10 As shown in 10b, the central device (PD201) of the PPG module is arranged at the geometric center of the PCB board 20. The PPG module also includes a reference axis 401, a reference axis 402 and a reference axis 403 during the layout process. Reference axis 501 and reference axis 504 are constructed between reference axis 401 and reference axis 403. Reference axis 505 is constructed between reference axis 401 and reference axis 402; reference axis 503 is constructed between reference axis 402 and reference axis 403. PD202 is arranged along the extension direction of reference axis 401; PD204 is arranged along the extension direction of reference axis 402; PD203 is arranged along the extension direction of reference axis 403. LED305 is arranged along the extension direction of reference axis 501; LED302 is arranged along the extension direction of reference axis 504; LED301 is arranged along the extension direction of reference axis 505; LED303 is arranged along the extension direction of reference axis 503. The process of arranging PD devices on the reference axis can be referred to. Figure 3 The process of arranging LED devices along the reference axis can be referred to in the relevant description of 3c. Figure 3 The relevant description of 3e will not be repeated here.

[0120] In some embodiments, the central device located at the geometric center of the PCB board 20 may also be a light emitter. Fig.11As shown in FIG. 11a , an LED 300 is arranged at the geometric center of the PCB board 20. Figure 3 Similar to 3a, three virtual reference axes are constructed with the geometric center of the PCB board 20 as the circle point, so that the three reference axes evenly divide the PCB board 20, such as the reference axis 401, the reference axis 402 and the reference axis 403 shown in 11a. The three reference axes converge at the light emitting center of the LED 300 and evenly divide the PCB board 20. A virtual reference axis is constructed between two adjacent reference axes, and each reference axis converges at the geometric center of the PCB board 20. Fig.11 As shown in FIG. 11a , a reference axis 501 is constructed between the reference axis 402 and the reference axis 403; a reference axis 502 is constructed between the reference axis 402 and the reference axis 401; and a reference axis 503 is constructed between the reference axis 401 and the reference axis 403. The angles between each reference axis and the adjacent reference axis can be different or the same.

[0121] Devices of the same type as the central device are arranged along the direction in which the reference axis extends. As shown in 11a, LED301 is arranged along the direction in which the reference axis 402 extends, and a center line of LED301 coincides with the reference axis; LED302 is arranged along the direction in which the reference axis 401 extends, and a center line of LED302 coincides with the reference axis; LED303 is arranged along the direction in which the reference axis 403 extends, and a center line of LED303 coincides with the reference axis. PD204 is arranged along the direction in which the reference axis 501 extends, and a center line of PD204 may coincide with the reference axis 501; PD202 is arranged along the direction in which the reference axis 502 extends, and a center line of PD202 may coincide with the reference axis 502; PD203 is arranged along the direction in which the reference axis 503 extends, and a center line of PD203 may coincide with the reference axis 503.

[0122] Optionally, the device disposed at the center of the PCB board 20 may also be a combination of multiple LEDs. Fig.11As shown in 11b, the central device includes a combination of LED300 and LED322, the LED300 may include a single-color crystal element (such as a green light crystal element), and the LED322 may include a two-color crystal element (such as a red light crystal element and an infrared light crystal element), and the combination of LED300 and LED322 can realize the monitoring of multiple human physiological parameters. When the central device includes two or more, a symmetry axis of the central device can be constructed, and the symmetry axis of the central device can pass through a straight line of the geometric center point of the PCB board 20 and divide the PCB board 20 equally. For example, the diameter of the circular PCB board 20 in 2b can be used as the symmetry axis of the central device. The LED300 and LED322 can be symmetrically arranged based on the symmetry axis of the central device, and the first center line of the LED300 and the first center line of the LED322 converge at the geometric center of the PCB board 20, and the first center line of the LED300 and the first center line of the LED322 are both perpendicular to the symmetry axis of the central device.

[0123] Based on the central device (ie, LED 300 and LED 322), reference axis 401, reference axis 402, and reference axis 403 are constructed. Fig.11 As shown in FIG11b, a reference axis 501 is constructed between the reference axis 402 and the reference axis 403; a reference axis 502 is constructed between the reference axis 402 and the reference axis 401; and a reference axis 503 is constructed between the reference axis 401 and the reference axis 403. Figure 3 The relevant description in will not be repeated here.

[0124] A device of the same type as the central device is arranged along the direction in which the reference axis extends, that is, in this example, two LED combinations are arranged in the direction in which the reference axis extends, and the LED combination may be consistent with or inconsistent with the LED combination in the central device. For example, it may be a combination of two LED wafers, or an LED package, or a combination of one LED wafer and one LED package structure. As shown in 11b, LED316 and LED317 are arranged along the direction in which the reference axis 402 extends, LED318 and LED319 are arranged along the direction in which the reference axis 401 extends, and LED320 and LED321 are arranged along the direction in which the reference axis 403 extends. PD204 is arranged along the direction in which the reference axis 501 extends, PD202 is arranged along the direction in which the reference axis 502 extends, and PD203 is arranged along the direction in which the reference axis 503 extends.

[0125] The LED 316, LED 318 and LED 320 may be first-level LED devices, and LED 317, LED 319 and LED 321 may be second-level LED devices. The first-level LED devices and the second-level LED devices may monitor different physiological parameters of the human body. For example, the LEDs in the first-level LED devices may include monochromatic crystals (such as green light crystals) to monitor the heart rate of the human body; the LEDs in the second-level LED devices may include multicolor crystals (such as red light crystals and infrared light crystals) to monitor the blood oxygen of the human body.

[0126] In addition, the wafers in the LED may also be wafers of other colors. Different colors of wafers may be used according to monitoring requirements. For example, the LED may also include blue light wafers.

[0127] In some embodiments, the LED and PD layout in the PPG module can also be other shapes, for example, the PD and LED can form a square layout structure. Fig.12 Specifically describe the PPG module for directional layout.

[0128] For example, if Fig.12 As shown in FIG. 12a, PD800 is arranged at the geometric center of PCB board 20. Based on PD800, reference axis 601, reference axis 602, reference axis 603 and reference axis 604 are constructed. In this example, reference axis 601 and reference axis 603 are parallel and converge at the photosensitive center of PD800, and reference axis 602 and reference axis 604 are parallel and converge at the photosensitive center of PD800. The reference axis 601 is perpendicular to the reference axis 602.

[0129] Similarly, reference axes are constructed between two adjacent reference axes, such as reference axis 701, reference axis 702, reference axis 703, and reference axis 704 shown in FIG12a. Reference axis 701 and reference axis 703 are parallel and converge at the photosensitive center of PD800, reference axis 702 and reference axis 704 are parallel and converge at the photosensitive center of PD800, and reference axis 701 is perpendicular to reference axis 702.

[0130] PD801 is set along the direction in which the reference axis 601 extends, PD802 is set along the direction in which the reference axis 602 extends, PD803 is set along the direction in which the reference axis 603 extends, and PD804 is set along the direction in which the reference axis 604 extends. LED901 is set along the direction in which the reference axis 701 extends, LED902 is set along the direction in which the reference axis 702 extends, LED903 is set along the direction in which the reference axis 703 extends, and LED904 is set along the direction in which the reference axis 704 extends. Fig.12As shown in FIG. 12a , the wiring of the devices other than PD800 forms a square structure. In this example, the LED includes three light-emitting die, for example, the light-emitting die may be a green light die, a red light die, and an infrared light die.

[0131] Alternatively, if Fig.12 As shown in FIG. 12b, LED 900 is arranged at the geometric center of PCB board 20. Reference axis 601, reference axis 602, reference axis 603 and reference axis 604 are constructed based on LED 900. In this example, reference axis 601 and reference axis 603 are parallel and converge at the light-emitting center of LED 900, and reference axis 602 and reference axis 604 are parallel and converge at the light-emitting center of LED 900. Reference axis 601 is perpendicular to reference axis 602.

[0132] Similar to 12a, reference axis 701, reference axis 702, reference axis 703 and reference axis 704 are constructed between two adjacent reference axes. LED 905 is set along the direction in which reference axis 601 extends, LED 906 is set along the direction in which reference axis 602 extends, LED 907 is set along the direction in which reference axis 603 extends, and LED 908 is set along the direction in which reference axis 604 extends. PD 805 is set along the direction in which reference axis 701 extends, PD 806 is set along the direction in which reference axis 702 extends, PD 807 is set along the direction in which reference axis 703 extends, and PD 808 is set along the direction in which reference axis 704 extends. Fig.12 As shown in FIG12b, the connection lines of the devices except the LED 900 form a square structure. In this example, the LED includes three light-emitting die, for example, the light-emitting die may be a green light die, a red light die and an infrared light die.

[0133] The above embodiment specifically illustrates the layout method based on the reference axis and the reference axis in this application. Fig.13 and Fig.14 The various optical measurement paths of the PPG module in the working state in this application are specifically described.

[0134] Fig.13 The figure is a schematic diagram showing various optical measurement paths of a PPG module as an example.

[0135] like Fig.13 As shown, the central device of the PPG module is PD1, and a PD device is arranged in the extension direction of each reference axis. Fig.13 PD2, PD3 and PD4 in the figure. An LED device is arranged in the extending direction of each reference axis, such as Fig.13LED1, LED2, and LED3 in it. In this example, the light-emitting centers of the LED devices on the reference axis deviate from the reference axis. For example, the light-emitting chip of LED2 deviates from the reference axis by 1301. Similarly, the light-emitting chips of LED1 and LED3 also deviate from their respective corresponding reference axes (the reference axes of LED1 and LED3 are not shown).

[0136] When LED1 is lit (i.e., LED1 emits light), at least PD1, PD2, and PD4 will receive the light emitted by LED1. As Fig.13 shown, the LED1 device can respectively form optical measurement paths with the central device PD1 and the adjacent PD devices of the first layer (i.e., PD2 and PD4), that is, at least form optical measurement paths g1, g4, and g9. Similarly, when LED2 is lit, the LED2 respectively forms optical measurement paths g2, g5, and g6 with PD1, PD2, and PD3. When LED3 is lit, the LED3 respectively forms optical measurement paths g3, g7, and g8 with PD1, PD3, and PD4.

[0137] In this example, the photosensitive centers of PD2, PD3, and PD4 are all located on the reference axis, and the light-emitting centers of LED1, LED2, and LED3 deviate from the reference axis, forming an asymmetric layout relative to the reference axis. In this example, the angles between the reference axis and the adjacent reference axes are the same, and the distance between LED1 and PD1 is less than the distance from the light-emitting center of LED1 to PD2. And because the light-emitting center deviates from the reference axis, the distance from the light-emitting center of LED1 to PD4 is longer than the distance from the light-emitting center of LED1 to PD2. Therefore, when LED1 is lit, the lengths of the optical measurement paths are: g1 < g4 < g9. Similarly, when LED2 emits light, the lengths of the optical measurement paths are: g2 < g6 < g5. When LED3 emits light, the lengths of the optical measurement paths are: g3 < g8 < g7.

[0138] Each LED light source can form three optical measurement paths, and the lengths of the three optical measurement paths are different, thus forming three differentiated optical paths, so that in terms of measurement signals, PPG signals of different vascular positions in skin tissue, different optical penetration depths, and different blood perfusions can be obtained. Usually, under the same spectral wavelength and the same luminous energy, the longer the optical path, the higher the perfusion rate value of the extracted blood perfusion PPG signal, but the corresponding signal energy is lower and the signal stability is low. On the contrary, when the optical path is shorter, the perfusion rate value of the extracted blood perfusion PPG signal is lower, but the signal energy is higher and the signal stability is high. In this example, the differentiated signal quality formed by different signal measurement channels can provide the algorithm with more signal choices, combine signal channels in different scenarios and modes, and improve the accuracy of monitoring human physiological parameters. In this layout, the central device is PD1, and the displacement of the center position of the PPG module relative to other edge positions is small, and it is not easy to separate from the measured part, so as to avoid the external ambient light or the light from the LED light source in the sensor directly entering the optical receiver during measurement, causing serious interference to the PPG signal, and improve the anti-interference ability in motion. At the same time, each LED receives optical energy from the adjacent PD at the same time, which effectively improves the optical efficiency of the PPG module and reduces power consumption.

[0139] Fig.14 The figure is a schematic diagram showing various optical measurement paths of a PPG module as an example.

[0140] like Fig.14 As shown, the central device of the PPG module is LED4, and one LED device is arranged in the extension direction of each reference axis. Fig.14 In the LED4, LED5, LED6 and LED7. A PD device is arranged in the extension direction of each reference axis, such as Fig.14 PD5, PD6 and LED7 in the figure. In this example, the light emitting center of the LED device on the reference axis deviates from the reference axis, such as the light emitting crystal of LED5 deviates from the reference axis 1401. Similarly, the light emitting crystal of LED6 and LED7 also deviate from their corresponding reference axes (the respective reference axes of LED6 and LED7 are not shown).

[0141] When LED1 is turned on (i.e., LED1 emits light), at least PD5, PD6, and PD7 will receive the light emitted by LED4. Fig.14As shown, the first-level LED devices can respectively form optical measurement paths with adjacent first-level PD devices. For example, LED5 can form an optical measurement path k5 with adjacent PD5, and LED5 can form an optical measurement path k6 with adjacent PD6. Similarly, when LED6 is lit, the LED6 respectively forms optical measurement paths k7 and k8 with PD6 and PD7. When LED7 is lit, the LED7 respectively forms optical measurement paths k4 and k9 with PD7 and PD5. In this example, the light-emitting center of LED4 deviates from the geometric center of the PCB board 20, and the light-emitting centers of LED5, LED6, and LED7 deviate from the reference axis, forming an asymmetric layout relative to the reference axis. In the example, the included angle between the reference axis and the adjacent reference axis is the same. The distance from LED4 to PD6 is shorter than the distance from LED4 to PD5, and the distance from LED4 to PD7 is equal to the distance from LED4 to PD5. When LED5 is lit, since the light-emitting chip of LED6 deviates from the reference axis, the distance from the light-emitting chip to PD6 is less than the distance from the light-emitting chip to PD5, that is, the length of the optical measurement path is: k6 < k5. Similarly, when LED6 is lit, the length of the optical measurement path is: k8 < k7. When LED7 is lit, the length of the optical measurement path is: k4 < k9. In this example, each LED can form at least two optical measurement paths with different lengths, which can provide more signal choices for the algorithm; while in the traditional measurement module, the measurement of different indicators is often fixed to certain specific signal channels and cannot provide more channel choices for the algorithm.

[0142] The PPG module in the embodiment of the present application can be set in a wearable electronic device for monitoring human physiological parameters. For example, the PPG module is set in a smart watch. When the user wears the smart watch, the human physiological parameters can be monitored through the PPG module in the smart watch. In different usage scenarios, the monitoring requirements for the human body are different. The process of the smart watch monitoring human physiological parameters will be specifically described below with reference to FIG. 15 and Fig.16 Specifically illustrate the process of the smart watch monitoring human physiological parameters.

[0143] FIG. 15 is a schematic diagram of an exemplary usage scenario of a smart watch.

[0144] As Fig.15a shown in (1) of Fig.15aAs shown in (2), the central device of the PPG module is PD1, and a PD device is arranged along the extension direction of each reference axis, namely PD2, PD3 and PD4. An LED device is arranged along the extension direction of each reference axis, such as Fig.15a LED1, LED2 and LED3 in (2).

[0145] The user can manually start the human physiological parameter monitoring function of the smart watch, or the smart watch can start the human physiological parameter monitoring function of the smart watch after detecting a preset trigger condition. The trigger condition can be the monitoring time preset by the user. When the human physiological monitoring function is started, the following can be performed: Fig.16 Steps shown.

[0146] Fig.16 FIG15 is a schematic diagram showing an exemplary process of the smart watch monitoring human physiological parameters.

[0147] Step 1601: The electronic device detects the posture of the electronic device.

[0148] In this example, after the smart watch starts the human physiological parameter monitoring function, the processor in the smart watch can detect the posture of the smart watch according to the posture sensor (such as a gyroscope). If the processor in the smart watch determines that the posture of the smart watch is different from the preset monitoring posture, it can remind the user to adjust the posture of the electronic device. If the processor determines that the posture of the smart watch is the same as the preset monitoring posture, step 1602 can be executed.

[0149] Optionally, if the processor obtains the posture of the electronic device, step 1602 may be directly executed.

[0150] Step 1602: The electronic device starts PD1, PD2, PD3 and PD4 to collect ambient light.

[0151] Exemplarily, the processor can control PD1, PD2, PD3 and PD4 to start, and the four PD devices can receive the ambient light of the environment in which the electronic device is located. The processor can obtain the light signals collected by PD1, PD2, PD3 and PD4 in the same period. PD1, PD2, PD3 and PD4 can transmit the collected light signals to the processor.

[0152] Step 1603: The electronic device determines whether the ambient light exceeds a preset ambient light threshold. If it exceeds the ambient light threshold, step 1604 is executed; if it does not exceed the ambient light threshold, step 1606 is executed.

[0153] Exemplarily, the preset ambient light threshold may be the ambient light collected by each PD of the smartwatch pre-stored in the electronic device. The maximum ambient light is obtained as the ambient light threshold corresponding to this posture. The preset posture may be the posture of the smartwatch when the PPG module monitors the physiological parameters of the human body. For example, in the posture where the smartwatch is fully attached to the human skin, the ambient light collected by PD1 to PD4 is obtained, denoted as S1 to S4. The maximum ambient light is obtained from S1, S2, S3, and S4 (such as S1 < S2 < S3 < S4), then S4 is used as the ambient light threshold corresponding to the current posture. If there is only one preset posture, the ambient light threshold (S4) corresponding to the posture where the smartwatch is fully attached to the human skin can be used as the preset threshold.

[0154] Optionally, if there can be multiple preset postures, the maximum value can be selected from the ambient light of each preset posture as the preset ambient light threshold. For example, the ambient light of posture 1 includes S1 and S4, the ambient light of posture 2 includes S2 and S5, and the ambient light of posture 3 includes S3 and S6. If S1 < S2 < S3 < S4 < S5 < S6, then S6 is selected as the preset ambient light threshold.

[0155] Exemplarily, when the processor receives the ambient light transmitted by 4 PDs, the ambient light collected by each PD can be compared with the preset ambient light threshold. When the processor detects that there is no ambient light exceeding the ambient light threshold, step 1606 can be executed. When the processor detects that there is ambient light exceeding the ambient light threshold, step 1604 can be executed.

[0156] Step 1604: The electronic device obtains the posture of the electronic device.

[0157] Exemplarily, the processor can determine the posture of the electronic device according to the ambient light collected by each PD device. In this example, PD1 is located in the middle of the PCB board, and PD2, PD3, and PD4 are located in different directions respectively. When the electronic device worn by the user is not fully attached to the user's skin, it will cause a large amount of light to enter in a certain direction. Based on this, the processor can determine the part of the PPG module that is not attached to the human skin.

[0158] For example, in the case of the posture shown in (1) of Fig.15a the processor in the smartwatch activates PD1, PD2, PD3, and PD4 to collect the ambient light of the environment where the smartwatch is located. As shown in Fig.15aAs shown in (2), the amount of light entering PD2 in the PCB board 20 of the PPG module is greater than the amount of light entering PD3 and PD4. PD1 is located at the center of the PCB board 20. When the PPG module is completely attached to the human skin, the amount of light entering PD1 is close to 0. When one side of the PPG module is higher than the other side, ambient light can enter the surrounding PD devices and PD1 located at the center. Fig.15a As shown in (2), the processor detects that the ambient light of PD2 is higher than the ambient light of other PD devices, and the ambient light of PD2 exceeds a preset threshold, then the processor can determine that the position of PD2 is higher than the positions of other PD devices, that is, the position of PD2 is not in contact with human skin.

[0159] Optionally, after the processor determines the part of the electronic device that is not in contact with the skin, it can further determine the current posture of the electronic device based on the posture of the electronic device detected in step 1601.

[0160] Step 1605: The electronic device reminds the user to adjust the posture of the electronic device.

[0161] Exemplarily, the processor in the electronic device can output prompt information according to the posture of the electronic device to remind the user to adjust the posture of the electronic device. For example, the processor can control the voice module of the smart watch to output voice to instruct the user to adjust the posture of the smart watch in the form of sound; the processor can also control the display screen of the smart watch to display adjustment information, which can be text information.

[0162] The processor detects whether the posture of the electronic device has changed. If it is detected that the posture has changed, step 1601 can be re-executed.

[0163] After the user views the prompt information, the user can adjust the posture of the electronic device according to the prompt information. Fig.15b As shown in (1) of 15a, the user adjusts the posture of the smart watch from (1) of 15a to the posture shown in (1) of 15b. The smart watch can re-detect the posture of the smart watch, execute step 1602, and start PD1, PD2, PD3 and PD4; as shown in (2) of 15b, the amount of light entering each PD2, PD3 and PD4 is the same. The processor detects that the collected ambient light does not exceed the preset ambient light threshold, and then executes step 1606.

[0164] Step 1606: The electronic device obtains the PPG signal output by the PPG module in the current usage scenario of the electronic device.

[0165] For example, when the electronic device is in different usage scenarios, the PPG module can adopt different measurement modes and output the PPG signal collected in the mode. The specific process of the electronic device obtaining the PPG signal output by the PPG module in the current usage scenario of the electronic device can refer to Fig.17 , the specific process is as follows:

[0166] Step 1701: The electronic device obtains scene data of the current usage scene of the electronic device.

[0167] Exemplarily, a processor in an electronic device may obtain scene data currently used by the electronic device, and the scene data may include one or more combinations of the following: acceleration of the electronic device, air pressure, temperature or humidity of the environment in which the electronic device is located, etc.

[0168] Scene data can be obtained by other sensors monitoring the environment. For example, the acceleration sensor in a smart watch can detect the acceleration of the electronic device; the temperature sensor in a smart watch can detect the temperature of the environment.

[0169] Step 1702: The electronic device determines the usage scenario of the electronic device. If it is determined that the electronic device is in a static state, step 1703 is executed; if it is determined that the electronic device is in a moving state, step 1704 is executed; if it is determined that the electronic device is in a low temperature and high altitude environment, step 1705 is executed.

[0170] Exemplarily, the processor can determine the usage scenario of the electronic device based on the scenario data. Optionally, the electronic device can store scenario data corresponding to each usage scenario, and when the processor detects that the acquired scenario data matches the stored scenario data, the usage scenario of the electronic device can be determined.

[0171] For example, an electronic device can store multiple usage scenarios, scenario 1: static scene; scenario 2: dynamic scene; scenario 3: low temperature, high altitude scene. The acquired scene data includes: acceleration V1, air pressure data P1; temperature data C1. If the processor detects that the speed V1 is in the speed range [Vth1, Vth2] in the static scene; then it is determined that the electronic device is in a static scene. If the processor detects that the air pressure data P1 is in the air pressure range corresponding to high altitude [Pth1, Pth2], and the temperature data C1 is in the low temperature range [Cth1, Cth2], then it is determined that the electronic device is in a low temperature and high altitude scene. If the processor detects that the speed V1 is in the speed range [Vth3, Vth4] in the motion scene, then it is determined that the electronic device is in a motion scene. Among them, Vth1 <Vth2<Vth3<Vth4;Pth1<Pth2;Cth1<Cth2。

[0172] Optionally, if the processor detects that the speed satisfies a static / dynamic scenario and is in a low temperature, high altitude environment, the processor determines that the electronic device is in a low temperature, high altitude environment.

[0173] Step 1703: The electronic device determines the PPG signal collected by the PPG module when the electronic device is in a static state.

[0174] Exemplarily, the PPG module has at least two measurement modes in static state, such as normal measurement mode and energy saving mode. Fig.18 This is a schematic diagram of the process of collecting PPG signals when the electronic device is in a static state. Fig.18 The process of the PPG module outputting the collected PPG signal in static state is specifically described, which includes the following sub-steps:

[0175] Sub-step 1801: The electronic device determines a static measurement mode. If the normal measurement mode is determined, sub-step 1802 is executed; if the energy-saving mode is determined, sub-step 1806 is executed.

[0176] Exemplarily, a static scene includes multiple measurement modes, for example, a static scene may include a normal measurement mode and an energy-saving mode. The triggering condition of the normal measurement mode may be: within a first preset time period. The triggering condition of the energy-saving mode may be: the operating period is in a second period, and the second period may be a period when the user rests, such as 23:00-6:00. Optionally, the triggering conditions of the normal measurement mode and the energy-saving mode may also include other contents, for example, the triggering conditions of the normal measurement mode and the energy-saving mode may also be receiving an instruction from the user to operate in the normal measurement mode / energy-saving mode.

[0177] Sub-step 1802: The electronic device lights up LED1, controls PD1, PD2 and PD4 to be connected in parallel, and controls PD1, PD2 and PD4 to receive signals.

[0178] Exemplarily, if the processor determines to adopt the normal measurement mode, the processor may instruct each optical transmitter to emit light in sequence; the processor may also instruct the optical receiver adjacent to the optical transmitter to be connected in parallel and receive the optical signal.

[0179] For example, if Fig.15b In the PPG module shown in (2), the processor can instruct LED1 to light up, and the PDs adjacent to LED1 include: PD1, PD2, and PD4. The processor can control PD1, PD2, and PD4 to be connected in parallel, and control PD1, PD2, and PD4 to receive signals. When LED1 is lit, refer to Fig.13 , the optical paths g1, g4 and g9 can be optically measured.

[0180] It should be noted that the processor can control the series and parallel switching between PD devices by outputting control signals. The description of the series and parallel switching between PD devices in this example can refer to the series and parallel switching between components in conventional technology, which will not be repeated here.

[0181] In normal mode, after the processor receives the PPG signal (denoted as Sig_1) when LED1 is lit, the processor can instruct the next LED to be lit (such as executing sub-step 1803), while controlling LED1 to be turned off, and instructing PD1, PD2 and PD4 to stop receiving light signals.

[0182] Sub-step 1803: The electronic device lights up LED2, controls PD1, PD2 and PD3 to be connected in parallel, and controls PD1, PD2 and PD3 to receive signals.

[0183] For example, Fig.15b In the PPG module shown in (2), the processor can instruct LED2 to light up, and the PDs adjacent to LED2 include: PD1, PD2, and PD3. The processor can control PD1, PD2, and PD3 to be connected in parallel, and control PD1, PD2, and PD3 to receive signals. When LED2 is lit, refer to Fig.13 , the optical paths g2, g5 and g6 can be optically measured.

[0184] In normal mode, after the processor receives the PPG signal (denoted as Sig_2) when LED2 is turned on, the processor can instruct the next LED to be turned on (such as executing sub-step 1804), while controlling LED2 to be turned off, and instructing PD1, PD2 and PD3 to stop receiving light signals.

[0185] Sub-step 1804: The electronic device lights up LED3, controls PD1, PD3 and PD4 to be connected in parallel, and controls PD1, PD3 and PD4 to receive signals.

[0186] For example, Fig.15b In the PPG module shown in (2), the processor can instruct LED3 to light up, and the PDs adjacent to LED3 include: PD1, PD3 and PD4. The processor can control PD1, PD3 and PD4 to be connected in parallel, and control PD1, PD3 and PD4 to receive signals. When LED3 is lit, refer to Fig.13 , optical measurement paths g3, g7 and g8 can be formed. PD1, PD3 and PD4 are connected in parallel, and the processor can obtain the PPG signal of LED3 (recorded as Sig_3).

[0187] When the processor detects the PPG signals of all LEDs, it turns off the LED3 and controls each PD to stop receiving signals.

[0188] Sub-step 1805: The PPG module outputs the PPG signal collected in the normal measurement mode. After this step, step 1607 is executed.

[0189] Exemplarily, the processor may determine the signal output by the normal measurement mode based on the three received PPG signals. For example, the processor may select the PPG signal with the best signal quality from the three received PPG signals (i.e., Sig_1, Sig_2, and Sig_3) as the PPG signal collected by the PPG module in the normal measurement mode.

[0190] In this example, other methods of determining the signal output in the normal measurement mode may also be used. For example, the processor may also obtain any one of the three PPG signals as the PPG signal collected by the PPG module in the normal measurement mode. Optionally, the processor may also calculate the average signal of the three PPG signals as the PPG signal collected by the PPG module in the normal measurement mode.

[0191] Sub-step 1806: The electronic device controls LED1, LED2 and LED3 to be connected in parallel and light up LED1, LED2 and LED3; controls PD1, PD2, PD3 and PD4 to be connected in parallel and receive signals. For example, if the processor determines to adopt the energy-saving mode, the processor can instruct each light transmitter to be connected in parallel and instruct each transmitter to emit light; the processor also instructs each light receiver to be connected in parallel and receive light signals.

[0192] For example, if Fig.13 In the PPG module shown, the processor can instruct LED1, LED2 and LED3 to be connected in parallel and light up LED1, LED2 and LED3. The processor controls PD1, PD2, PD3 and PD4 to be connected in parallel and receive signals. Since LED1, LED2 and LED3 are connected in parallel, the power of the optical transmitter is reduced. Similarly, PD1, PD2, PD3 and PD4 are connected in parallel, which also reduces the power consumption of PD, thereby achieving the purpose of energy-saving measurement.

[0193] PD1, PD2, PD3 and PD4 receive the optical signal simultaneously and obtain a PPG signal, which is recorded as Sig_4.

[0194] Sub-step 1807: The PPG module outputs the PPG signal collected in the energy-saving mode. After this step, step 1607 is executed.

[0195] Exemplarily, the electronic device can use the PPG signal acquired in sub-step 1806 as the PPG signal collected by the PPG module in the energy-saving mode, such as using Sig_4 as the PPG signal collected in the energy-saving mode, and then the processor executes step 1607 to determine whether the acquired PPG signal meets the measurement conditions.

[0196] The above sub-steps 1801 to 1806 are a process for determining the PPG signal collected by the PPG module when the electronic device is in a static state.

[0197] Step 1704: The electronic device determines the PPG signal collected by the PPG module when the electronic device is in motion.

[0198] For example, when the scene of the electronic device is determined to be a motion scene, the measurement can be performed in a manner corresponding to the motion scene. In this example, since the sensor may be displaced, flipped, or shaken in motion, causing optical crosstalk, multiple measurements can be performed in the motion scene to obtain different PPG signals. Fig.13 In the PPG module shown, the central device is PD1, which is located at the center of the PCB board. The center is less affected by the displacement, flipping, and shaking of the PPG module. Therefore, the processor can control each LED to light up in turn, and instruct PD to receive the signal to obtain the corresponding PPG signal (such as steps 1613 to 1615).

[0199] Fig.19 The schematic diagram of the process of the PPG module collecting PPG signals when the electronic device is in motion is shown below. Fig.19 The process of collecting the PPG signal by the PPG module is specifically described, which includes the following sub-steps:

[0200] Sub-step 1901: The electronic device lights up LED1 and controls PD1 to receive a signal.

[0201] When the processor obtains the PPG signal corresponding to LED1 (denoted as Sig_5), the processor can control LED1 to turn off.

[0202] Sub-step 1902: The electronic device lights up LED2 and controls PD1 to receive a signal.

[0203] When PD1 receives the PPG signal corresponding to LED2 (denoted as Sig_6) and transmits it to the processor, the processor can control LED2 to turn off.

[0204] Sub-step 1903: The electronic device lights up LED 3 and controls PD 1 to receive a signal.

[0205] When PD1 receives the PPG signal corresponding to LED2 (denoted as Sig_7) and transmits it to the processor, the processor can control LED2 to turn off. By selecting optical measurement paths g1, g2, and g3, and receiving signals through PD1 located at the center, the optical crosstalk caused by displacement, flipping, and shaking of the sensor can be reduced.

[0206] Sub-step 1904: The electronic device controls LED1, LED2 and LED3 to be connected in parallel and light up LED1, LED2 and LED3, and controls PD1 to receive a signal.

[0207] For example, in the motion state, the processor can also control all LEDs to be connected in parallel and light up, and PD1 receives the signal. Fig.13 As shown, the processor controls LED1, LED2 and LED3 to be connected in parallel and light up LED1, LED2 and LED3, and controls PD1 to receive signals, and the processor obtains a PPG signal, which is recorded as Sig_8.

[0208] In this example, the LEDs are connected in parallel and lit to reduce power consumption during the measurement process.

[0209] Sub-step 1905: The electronic device controls LED1, LED2 and LED3 to be connected in parallel and light up the LED1, LED2 and LED3, and controls PD1, PD2, PD3 and PD4 to be connected in parallel and receive signals. After this step, step 1906 is executed.

[0210] For example, in the motion state, the processor can also control all LEDs to be connected in parallel and light up, and control all PDs to be connected in parallel and receive signals. Fig.13 As shown, the processor controls LED1, LED2 and LED3 in parallel and lights up LED1, LED2 and LED3, and controls PD1, PD2, PD3 and PD4 in parallel and receives signals. The processor obtains the PPG signal corresponding to the measurement method, which is recorded as Sig_9.

[0211] Sub-step 1906: The electronic device obtains the optimal PPG signal from the multiple PPG signals. After executing step 1906, execute step 1607.

[0212] Exemplarily, the processor selects the best signal from the PPG signals obtained in steps 1901 to 1905. For example, the PPG signal with the best signal quality is obtained from Sig_5 to Sig_9. The best PPG signal is obtained from multiple PPG signals.

[0213] The above sub-steps 1901 to 1906 are a process for determining the PPG signal collected by the PPG module when the electronic device is in motion.

[0214] Step 1705: The electronic device determines the PPG signal collected by the PPG module when the electronic device is in a low temperature and high altitude state.

[0215] For example, a long optical measurement channel has a higher pulse signal perfusion rate, and a short optical measurement signal channel has a higher signal energy. When it is determined that the electronic device is in a low temperature, high altitude environment, a high perfusion rate is required. Fig.13 As shown, optical measurement channels g9, g5 and g7 can be selected.

[0216] Fig. 20 The schematic diagram of the process of collecting PPG signals of the PPG module of the electronic device under low temperature and high altitude conditions includes the following sub-steps:

[0217] Sub-step 2001: The electronic device lights up LED 1 and controls PD 4 to receive a signal.

[0218] The processor lights up LED1 and controls PD4 to receive the signal, that is, measures through g9, and the processor obtains the PPG signal, which is recorded as Sig_10.

[0219] Sub-step 2002: The electronic device lights up LED2 and controls PD2 to receive a signal.

[0220] The processor lights up LED2 and controls PD2 to receive the signal, that is, measures through g5, and the processor obtains the PPG signal, which is recorded as Sig_11.

[0221] Sub-step 2003: The electronic device lights up LED 3 and controls PD 3 to receive signals.

[0222] The processor lights up LED3 and controls PD3 to receive the signal, that is, measures through g7, and the processor obtains the PPG signal, which is recorded as Sig_12.

[0223] Sub-step 2004: the electronic device controls LED1, LED2 and LED3 to be connected in parallel and light up the LED1, LED2 and LED3, and controls PD1, PD2, PD3 and PD4 to be connected in parallel and receive signals. After this step, sub-step 2005 is executed.

[0224] For example, when it is determined that the electronic device is in a low temperature and high altitude environment, the processor controls LED1, LED2 and LED3 to be connected in parallel and light up the LED1, LED2 and LED3, and controls PD1, PD2, PD3 and PD4 to be connected in parallel and receive signals. By increasing the optical signal channel, the optimal PPG signal can be obtained.

[0225] The processor lights up LED1, LED2 and LED3, and controls PD1, PD2, PD3 and PD4 to receive signals, and the processor obtains a PPG signal, which is recorded as Sig_13.

[0226] Sub-step 2005: The electronic device obtains the optimal PPG signal from the multiple PPG signals. After executing step 1906, execute step 1607.

[0227] Exemplarily, the processor may obtain the optimal signal from the PPG signals obtained in sub-steps 2001 to 2004, that is, select the optimal signal from Sig_10 to Sig_13.

[0228] The above sub-steps 2001 to 2005 are a process for determining the PPG signal collected by the PPG module when the electronic device is in a low temperature and high altitude state.

[0229] In this example, combined Figures 17 to 20 The process of the electronic device acquiring the PPG signal collected by the PPG module in various states is specifically described. After the electronic device acquires the PPG signal collected by the PPG module in various states, step 1607 can be executed.

[0230] Step 1607: The electronic device determines whether the signal quality meets the measurement condition. If it is determined that the measurement condition is met, step 1608 is executed; if it is determined that the measurement condition is not met, step 1609 is executed.

[0231] For example, a signal quality threshold may be preset, and when the processor determines that the signal quality of the PPG signal output in the current usage scenario exceeds the signal quality threshold, it is determined that the measurement condition is met. If the processor determines that the signal quality of the PPG signal output in the current usage scenario does not exceed the signal quality threshold, it is determined that the measurement condition is not met.

[0232] Step 1608: Acquire a measurement signal. After this step, execute step 1611.

[0233] Step 1609: The processor instructs the PPG module to perform a full-channel PPG signal inspection.

[0234] Exemplarily, the full-channel PPG signal inspection may be to obtain the PPG signal through each optical measurement channel, that is, to obtain all the PPG signals of sub-steps 1802 to 1806, sub-steps 1901 to 1905, and sub-steps 2001 to 2005 to obtain Sig_1 to Sig_13.

[0235] Step 1610: The processor obtains the optimal signal from the PPG signal corresponding to each channel as the measurement signal. After this step, step 1611 is executed.

[0236] Exemplarily, the processor selects the best PPG signal from Sig_1 to Sig_13 as the measurement signal.

[0237] Step 1611: The electronic device determines a measurement result according to the measurement signal.

[0238] Exemplarily, the processor can calculate and obtain human physiological parameters, such as heart rate, blood oxygen and other data based on the measurement signal.

[0239] In this example, the PPG signal measurement method is used. By judging the scene, different measurement modes are started for different usage scenarios (that is, different LEDs and different PDs are started), instead of using the same measurement method. This improves the measurement accuracy and avoids the problem of being unable to monitor human physiological parameters in certain scenarios. For example, in low temperature and high altitude usage scenarios, a high perfusion rate is required, and a long optical measurement path can achieve monitoring of the human body.

[0240] Any content of each embodiment of the present application, as well as any content of the same embodiment, can be freely combined. Any combination of the above content is within the scope of the present application.

[0241] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A PPG module, characterized in that: include: A central device, wherein the central device is an optical transmitter or an optical receiver; at least three reference devices, the three reference devices are arranged at the periphery of the central device and at different positions, and the type of the reference devices is the same as that of the central device; A reference device is arranged in each reference area, and the reference area is the position of the angle space formed by two adjacent reference devices among the three reference devices and the central device; wherein, if the central device is a light transmitter, each of the reference areas includes at least one reference device that is a light receiver; if the central device is a light receiver, each of the reference areas includes at least one reference device that is a light transmitter; The i-th reference device close to the central device at different positions is used as the i-th layer reference device of the PPG module, where i is an integer greater than 0; The j-th reference device close to the central device at different positions is used as the j-th layer reference device of the PPG module, where j is an integer greater than 0; If the central device is an optical receiver, when the i-th layer of reference devices is provided, at least the (2i-1)-th layer of reference devices and the 2i-th layer of reference devices are provided correspondingly, and the reference devices include optical transmitters, or the reference devices include optical transmitters and optical receivers; wherein, when the number of layers of the reference devices is 2, there are at least 2 different distances between the central device and each reference device of the j-th layer of reference devices; when the number of layers of the reference devices is greater than 2, the distances between each two adjacent layers of reference devices are not equal; If the central device is a light transmitter, when at least the 2i-th layer of reference devices and the (2i-1)-th layer of reference devices are provided, then the i-th layer of reference devices is provided accordingly, and the reference devices include light receivers, wherein when the number of layers of the reference devices is 2, there are at least 2 different distances between the central device and each of the reference devices of the i-th layer of reference devices; when the number of layers of the reference devices is greater than 2, the distances between each two adjacent layers of reference devices are not equal; If the central device is the light receiver and the number of reference devices is greater than 1, the photosensitive centers of each of the reference devices in the same orientation are in the same straight line; If the central device is the light emitter and the number of reference devices is greater than 1, the light emission centers of each of the reference devices in the same orientation are in the same straight line.

2. The PPG module according to claim 1, characterized in that: If the central device is a light receiver, the reference device is a light receiver, and the reference area includes a light transmitter; the distance between each light transmitter and each adjacent light receiver is different.

3. The PPG module according to claim 2, characterized in that: Each of the reference regions includes N reference devices, where N is an integer greater than 0; The connection line between the central device and each of the reference devices in the reference area coincides; The angle formed between each two adjacent reference devices and the central device is divided into two different angles by the connecting lines between the N reference devices and the central device.

4. The PPG module according to claim 3, characterized in that: The angles formed between each two adjacent reference components and the central component are the same; If the central device is a light emitter, the light emission center of each of the reference devices in at least three different orientations is in the same straight line with the light emission center of the central device; If the central device is a light receiver, the photosensitive center of each of the reference devices in at least three different orientations is in the same straight line as the photosensitive center of the central device.

5. The PPG module according to claim 2, characterized in that: Each of the reference regions includes N reference devices, where N is an integer greater than 0; The connection line between the central device and each of the reference devices in the reference area coincides; The angle formed between each two adjacent reference devices and the central device in the reference area is divided into two identical angles by the connecting lines between the N reference devices and the central device; If the central device is a light receiver, the light emission center of the light transmitter in the N reference devices is close to one of the reference devices in the adjacent orientation; If the central device is a light transmitter, the photosensitivity center of the light receiver in the N reference devices is close to one of the reference devices in an adjacent position.

6. The PPG module according to any one of claims 1 to 2, characterized in that: If the central device is a light receiver, the photosensitivity center or geometric center of the central device is located outside the line connecting the multiple reference devices in the same orientation; If the central device is a light emitter, the light emission center or geometric center of the central device is located outside the line connecting multiple reference devices in the same position.

7. The PPG module according to any one of claims 1 to 5, characterized in that: When the reference device in the reference area includes a light receiver and a light transmitter; The optical receivers and the optical transmitters located at the same position are arranged in sequence and spaced apart, and the reference device closest to the central device is matched with the central device to form an optical measurement path.

8. The PPG module according to any one of claims 1 to 2, characterized in that: The reference devices in each reference region are located at at least two different orientations; The lines connecting the reference devices at different positions in the reference area and the central device intersect at the central device; The angle formed between each two adjacent reference devices and the central device is equally divided by the lines between the reference devices and the central device located at at least two different orientations, or the angle formed between each two adjacent reference devices and the central device is divided into at least three different angles by the lines between the reference devices and the central device at at least two different orientations.

9. The PPG module according to any one of claims 1 to 5, characterized in that: The light emitter includes a red light wafer and an infrared light wafer; and / or, The light emitter includes a green light wafer and a blue light wafer.

10. The PPG module according to any one of claims 1 to 5, characterized in that: The light emitter includes at least 2 different light emitting crystals; If the central device is a light emitting device, the two light emitting crystals in the reference device are symmetrically arranged based on a center line of the reference device; If the reference device includes a light emitter, two light emitting wafers in the reference device are symmetrically arranged based on a center line of the reference device.

11. The PPG module according to any one of claims 1 to 5, characterized in that: If the number of reference devices in each orientation is greater than 1, the geometric center of each of the reference devices located at the same orientation is in the same straight line as the geometric center of the central device.

12. The PPG module according to any one of claims 1 to 5, characterized in that: The optical receiver is a wafer structure or a packaging structure in which a light receiving wafer is packaged; The light emitter adopts a packaging structure or a wafer structure.

13. The PPG module according to any one of claims 1 to 5, characterized in that: The number of locations where the reference devices are located in each reference region is different.

14. The PPG module according to claim 5, characterized in that: The connection lines between the benchmark device located on the same layer number and the reference device located on the same layer number surround the quadrilateral.

15. The PPG module according to any one of claims 1 to 5, characterized in that: The PPG module is deployed in an electronic device; The geometric center of the central device is located at the geometric center of the plane where the PPG module is located; or, The light emitting center of the central device is located at the geometric center of the plane where the PPG module is located; or, The photosensitivity center of the central device is located at the geometric center of the plane where the PPG module is located.

16. The PPG module according to any one of claims 1 to 5, characterized in that: If the PPG module is used to monitor heart rate, the distance between the optical receiver and the optical transmitter in the PPG module is between [1 mm, 10 mm]; If the PPG module is used to monitor blood oxygen parameters, the distance between the light receiver and the light transmitter in the PPG module is greater than 10 mm.

17. A method for measuring a PPG signal, characterized in that: Applied to an electronic device, the electronic device comprising a processor and a PPG module as claimed in any one of claims 1 to 16 electrically connected to the processor, the method comprising: Acquire a usage scenario of the electronic device; According to a usage scenario of the electronic device, determining a measurement mode matching the usage scenario; Controlling the operation of the optical transmitter according to the indication of the measurement mode, and controlling the connection mode of the optical receiver indicated by the measurement mode, to obtain the PPG signal output by the measurement mode; The measurement result of the PPG module is determined according to the PPG signal output by the measurement mode.

18. The method according to claim 17, characterized in that The central component of the PPG module is an optical receiver; if the measurement mode is a normal measurement mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: The following processing is performed for each optical transmitter in turn: the optical transmitter is started to transmit an optical signal, and the optical receivers adjacent to the optical transmitter are controlled to be connected in parallel; and the parallel optical receivers are controlled to receive the PPG signal; Based on each received PPG signal, a PPG signal output by the measurement mode is determined.

19. The method according to claim 17, characterized in that The central component of the PPG module is an optical receiver; if the measurement mode is an energy-saving mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: Control each light emitter to be connected in parallel, and light up the parallel light emitters; Control each optical receiver to be connected in parallel, and control the parallel optical receivers to receive the PPG signal; The received optical signal is used as the PPG signal output in the energy-saving mode.

20. The method according to claim 17, characterized in that The central component of the PPG module is an optical receiver; if the measurement mode is a motion measurement mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: Lighting up each light emitter in turn, and controlling the central device to receive each PPG signal in turn; Changing the connection mode between the optical transmitters to parallel connection, and controlling the central device to receive the PPG signal; Change the connection mode of each optical receiver to parallel connection; Light up each optical transmitter and control each optical receiver connected in parallel to receive the PPG signal; An optimal PPG signal is obtained from each received PPG signal as the PPG signal in the motion measurement mode.

21. The method according to claim 17, characterized in that The central component of the PPG module is an optical receiver; if the measurement mode is a measurement mode corresponding to a low temperature and high altitude scene, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the optical receiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: Lighting up each light emitter in turn, and controlling a light receiver that is adjacent to the light emitter and farthest from the light emission center of the light emitter to receive a PPG signal; Changing the connection mode between the transmitters to parallel connection and changing the connection mode between the optical receivers to parallel connection; Lighting up each of the light transmitters, and controlling each of the light receivers connected in parallel to receive a PPG signal; An optimal PPG signal is obtained from each received PPG signal as the PPG signal in the measurement mode corresponding to the low temperature and high altitude scene.

22. The method according to any one of claims 17 to 21, characterized in that Determining the measurement result of the PPG module according to the PPG signal outputted in the measurement mode includes: Determining whether the PPG signal output in the measurement mode meets the preset measurement conditions; If it is determined that the conditions are met, the output PPG signal is used as the measurement signal; If it is determined that the conditions are not met, the PPG signals corresponding to the optical measurement channels in each measurement mode are obtained, and the optimal signal is obtained from the obtained PPG signals as the measurement signal; The measurement result is calculated according to the measurement signal.

23. The method according to any one of claims 17 to 21, characterized in that Before obtaining the usage scenario of the electronic device, the method further includes: Controlling each optical receiver to receive ambient light; determining a first posture of the electronic device according to the ambient light; According to the first posture, acquiring a wearing posture of the electronic device; When the wearing posture does not meet the preset measurement posture, a prompt message is output to instruct the user to adjust the wearing posture of the electronic device.

24. The method according to claim 23, characterized in that Before determining the first posture of the electronic device according to the ambient light, the method further includes: Determining a second posture of the electronic device according to a posture sensor; The step of determining the wearing posture of the electronic device according to the ambient light comprises: The wearing posture of the electronic device is determined according to the first posture and the second posture.

25. An electronic device, characterized in that: include: one or more processors; A PPG module according to any one of claims 1 to 16 electrically connected to the processor; Memory; And one or more computer programs, wherein the one or more computer programs are stored in the memory, and when the computer programs are executed by the one or more processors, the electronic device performs the PPG signal measurement method as described in any one of claims 17 to 24.

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