CN117297574A

CN117297574A - PPG module, measurement method of PPG signal and electronic equipment

Info

Publication number: CN117297574A
Application number: CN202210704094.5A
Authority: CN
Inventors: 苏丹; 刘毅; 蔡辛培; 尚睿颖
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2023-12-29
Also published as: WO2023246276A1

Abstract

The application provides a PPG module, a measurement method of a PPG signal and electronic equipment, and relates to the technical field of electronics. PPG module in this application includes: a central device, which is a light emitter or a light receiver; at least 3 reference devices, wherein the 3 reference devices are arranged on the periphery of the central device and positioned in different orientations, and the types of the reference devices are the same as those of the central device; the reference devices are arranged in each reference area, the reference areas are positions of included angle spaces formed by two adjacent reference devices and the central device in the 3 reference devices, and the reference areas at least comprise one reference device matched with the central device. By adopting the PPG module, the optical measurement path of each light emitter in the PPG module can be increased, the optical efficiency of the light emitters is improved, and the accuracy of measuring human parameters by the PPG module is improved.

Description

PPG module, measurement method of PPG signal and electronic equipment

Technical Field

The present disclosure relates to the field of electronic technology, and in particular, to a photoplethysmograph (PPG) module, a method for measuring a PPG signal, and an electronic device.

Background

Along with the development of electronic technology, the intelligent terminal can monitor relevant physiological parameters of a human body through a sensor with a specific function, for example, a PPG module is installed in the intelligent terminal (such as a bracelet, a watch, an arm pack and other devices), and the PPG module can collect data of heart rate, blood oxygen, blood pressure and the like of the human body. The PPG module mainly includes a light emitter and a Photodetector (PD), and the light emitter may be a light emitting diode (light emitting diode, LED). Principle of PPG module: the LED emits infrared light, red light or green light to irradiate human skin, then the PD collects signals reflected and scattered by the human skin, the change of the reflected light intensity caused by blood flow is measured, thus pulse waveform is obtained, and effective signals are extracted from the pulse waveform to calculate human physiological parameters such as heart rate, blood pressure, blood oxygen and the like.

The layouts of the PD and the LEDs in the PPG module are various, and the overall optical efficiency, power consumption and size of the PPG module are influenced by the layouts of the PD and the LEDs, so that the layouts of the PD and the LEDs in the PPG module are required to be reasonably planned.

Disclosure of Invention

In order to solve the technical problem, the application provides a PPG module, a measurement method of a PPG signal and electronic equipment, which can increase the optical measurement path of each light emitter in the PPG module, improve the optical efficiency of the light emitters and improve the accuracy of measuring human parameters by the PPG module.

In a first aspect, the present application provides a PPG module, a central device, the central device being a light emitter or a light receiver; at least 3 reference devices, wherein the 3 reference devices are arranged on the periphery of the central device and positioned in different orientations, and the types of the reference devices are the same as those of the central device; the reference devices are arranged in each reference area, and the reference areas are positions of included angle spaces formed by two adjacent reference devices and the central device in the 3 reference devices; if the central device is a light emitter, each reference area at least comprises one reference device which is a light receiver; if the central device is an optical receiver, each reference area includes at least one reference device that is an optical transmitter.

Therefore, the reference device is arranged on the periphery of the central device and located in different directions, after the position of the central device is determined, the current layout center of the PPG module can be determined based on the position of the central device, and other PD devices or LED devices are distributed by taking the position of the central device as a reference, so that the devices in the PPG module are distributed more regularly, and the speed of distributing the reference device is improved. The reference device is positioned in the reference area, the reference area is determined based on the position of the reference device and the position of the center device, and the area position for laying the reference device is reduced through the reference device and the center device, so that the speed for laying the reference device is improved. Meanwhile, the central device is a light emitter, each reference area comprises at least one reference device which is a light receiver, the central device is a light receiver, each reference area comprises at least one reference device which is a light emitter, so that at least one reference device in the reference areas is arranged at intervals with the reference devices, the number of optical measurement paths of the light emitter is increased, the optical efficiency of the light emitter is improved, and the power consumption is reduced; the central device is an optical receiver, and if the reference device is 3, the reference area is provided with at least one optical transmitter, and the optical transmitter in each reference area can form at least 3 optical measurement paths.

According to a first aspect, if the central device is a light emitter, the reference device is a light emitter and the reference area includes a light receiver; the distance between the center 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 comprises a light emitter; each optical transmitter is at a different distance from adjacent respective optical receivers.

In this way, the distance between each light emitter and each adjacent light receiver is different, so that the light emitters can form optical measurement paths with different lengths, and the PPG module can obtain PPG signals of different blood vessel positions, different optical penetration depths and different blood perfusion of skin tissues in terms of measurement signals due to the differential optical measurement paths, thereby improving the accuracy of measuring human parameters by the PPG module.

According to a first aspect, each reference region includes N reference devices therein, N being an integer greater than 0; the connecting lines between the N reference devices and the central device are in the same straight line; the included angle formed between every two adjacent reference devices and the central device is divided into two different included angles by the connecting lines between the N reference devices and the central device.

In this way, the connecting lines between the N reference devices and the central device in the reference area are in the same straight line, so that the reference devices are regularly distributed in the reference area, meanwhile, the included angle formed between each two adjacent reference devices and the central device is divided into different two included angles by the connecting lines between the N reference devices and the central device, so that the distances from the reference devices to the adjacent reference devices in adjacent directions are different, and the lengths of optical measurement paths formed between the reference devices and the reference devices are different no matter whether the reference devices are light emitters or light receivers, so that the measurement accuracy of the PPG module can be improved.

According to a first aspect, the included angle formed between each two adjacent reference devices and the central device is the same; if the central device is a light emitter, the light emitting center of each reference device in at least 3 different directions is in the same straight line with the light emitting center of the central device; if the center device is a light receiver, the photosensitive center of each reference device in at least 3 different orientations is collinear with the photosensitive center of the center device. Like this, the contained angle that forms between every two adjacent benchmark devices and the central device is the same, if the central device is the light emitter, and the benchmark device is also the light emitter, and the luminous center of every benchmark device is in same straight line with the luminous center of central device, if the central device is the light receiver, the benchmark device also is the light receiver, and the sensitization center of every benchmark device is in same straight line with the sensitization center of central device for the position of the benchmark device of laying is in whole PPG module mutual symmetry, and the symmetry sets up the length of each optical measurement channel of being convenient for according to the measurement demand flexible adjustment.

According to a first aspect, each reference region includes N reference devices therein, N being an integer greater than 0; the connecting lines between the N reference devices and the central device are in the same straight line; the included angle formed between every two adjacent reference devices and the central device in the reference area is divided into two same included angles by the connecting lines between the N reference devices and the central device; if the central device is a light receiver, the light emitting center of the light emitter in the N reference devices is close to one of the reference devices in adjacent directions; if the central device is a light emitter, the photosensitive center of the light receiver in the N reference devices is close to one of the adjacent reference devices. In this way, the included angle formed between every two adjacent reference devices and the central device in the reference area is divided into the same two included angles by the connecting lines between N reference devices (such as N is 1 or more than 2) and the central device, so that the reference devices are symmetrically distributed, the photosensitive center or the luminous center in the reference device is close to one of the adjacent reference devices, optical measurement paths with different lengths are formed between the reference device and the adjacent two reference devices, and the measurement accuracy of the PPG module is improved.

According to a first aspect, the i-th reference device located in different directions and close to the central device is used as the i-th layer reference device of the PPG module, and i is an integer greater than 0; the distance between the central device and each reference device in the ith layer of reference devices is equal or unequal; the j-th reference device which is positioned in different directions and is close to the central device is used as a j-th layer reference device of the PPG module, j is an integer greater than 0, and the reference device comprises a light emitter or a light receiver; the distance between the center device and each of the j-th layer reference devices is equal or unequal. In this way, the multi-layer reference devices and the multi-layer reference devices can be arranged, the flexibility of arranging the reference devices and the reference devices is improved, and meanwhile, when the distances between each layer of reference devices are the same, the arranged reference devices are regular, the regular arrangement mode enables the layout to be attractive, and meanwhile, the length of each optical measurement path is convenient to calculate; when the distances between each layer of reference devices are different, the flexibility of the layout devices is improved.

According to the first aspect, if the center device is an optical receiver, when the i-th layer reference device is provided, the (2 i-1) -th layer reference device and the 2 i-th layer reference device are provided correspondingly; if the central device is a light emitter, when the 2i layer reference device and the (2 i-1) layer reference device are arranged, the i layer reference device is correspondingly arranged; wherein the distances between every two adjacent layers of reference devices are equal or unequal; the distances between every two adjacent reference devices are equal or unequal. Thus, each layer of reference device is provided with a reference device of a corresponding layer, for example, the 1 st layer of reference device is corresponding to the 1 st layer of reference device and the 2 nd layer of reference device, the layers of the light emitter and the layers of the light receiver are different, a plurality of layers of light emitters are arranged, and the flexibility of layout is improved.

According to the first aspect, if the central device is an optical receiver, the photosensitive center or the geometric center of the central device is located outside the connecting line between the plurality of 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 connection line between the plurality of reference devices in the same orientation. In this way, the flexibility of the layout of the reference devices is further improved because the photosensitive center or the geometric center of the central device is located outside the connection line between the plurality of reference devices in the same orientation or the light emitting center or the geometric center of the central device is located outside the connection line between the plurality of reference devices in the same orientation.

According to a first aspect, a reference device within a reference area comprises an optical receiver and an optical transmitter; the light receiver and the light emitter which are positioned in the same direction are sequentially arranged at intervals, and the reference device nearest to the central device is matched with the central device to form an optical measurement path. Thus, the light receiver and the light emitter which are positioned in the same azimuth are sequentially arranged at intervals, and the reference device closest to the central device is matched with the central device, for example, the central device is the light emitter, the reference device closest to the central device is the light receiver, and if the central device is the light receiver, the reference device closest to the central device is the light emitter. When the central device is an optical receiver, the reference device nearest to the central device may form at least 4 optical measurement paths with an adjacent optical receiver, and when the central device is an optical transmitter, the central device may form at least 3 optical measurement paths, and the optical transmitter in the reference area may form at least 2 optical measurement paths, that is, the optical measurement paths of the optical transmitter may be further increased in such a manner that the intervals are set.

According to a first aspect, the reference devices within each reference area are located in at least 2 different orientations; the connecting line between the reference device and the central device in each direction is in the same straight line; the included angle formed between every two adjacent reference devices and the central device is equally divided by the connecting line between the reference devices and the central device in at least 2 different directions, or the included angle formed between every two adjacent reference devices and the central device is divided into at least 3 different included angles by the connecting line between the reference devices and the central device in at least 2 different directions.

Thus, the reference devices in each reference area are positioned in at least 2 different directions, for example, the reference devices can be provided with a light emitter and a light receiver at 2-direction intervals, and can also be provided with the light emitter or the light receiver, so that the flexibility of layout of the reference devices is improved.

According to a first aspect, a light emitter comprises at least 2 different light emitting cells; if the central device is a light emitting device, two light emitting crystal elements in the reference device are symmetrically arranged based on a central line of the reference device; if the reference device comprises a light emitter, two light emitting crystal elements in the reference device are symmetrically arranged based on a central line of the reference device. Thus, the light emitting crystal elements are symmetrically arranged, which is beneficial to accurately detecting human body parameters, for example, when detecting human body blood oxygen, the light emitter comprises a red light crystal element and an infrared light crystal element, and the two crystal elements are symmetrically arranged.

According to a first aspect, the geometric center of each reference device is collinear with the geometric center of the center device. In this way, the geometric center of the reference device and the geometric center of the central device are in the same straight line, so that the deployed central device and the reference device are orderly arranged, and other devices are convenient to set.

According to the first aspect, if the central device is a light receiver, the photosensitive center of each reference device in the same direction is in the same straight line; if the central device is a light emitter, the light emitting centers of the reference devices in the same direction are in the same straight line. Thus, the photosensitive centers of each reference device in the same direction are in the same straight line or the light emitting centers of each reference device in the same direction are in the same straight line, so that the layout of the reference devices is neat, and meanwhile, the distance from an optical signal emitted by an optical transmitter to an optical receiver is easy to calculate.

According to the first aspect, the light receiver is a wafer structure or a package structure in which a light receiving wafer is packaged; the light emitter adopts a packaging structure or a wafer structure. Therefore, the light receiver or the light emitter can adopt a packaging structure, the packaging structure is convenient to deploy, and the light receiver or the light emitter can be flexibly arranged in a space-effective area due to the small wafer structure.

According to the first aspect, the number of orientations in which the reference device is located within each reference region is different. In this way, the flexibility in deploying the reference devices is further improved due to the different number of orientations in which the reference devices are located within each reference region. For example, 2 reference devices of different orientations may be laid out in one reference area, 1 reference device of an orientation in another reference area, and 3 reference devices of an orientation in a third reference area.

According to the first aspect, the connection line between the reference device located at the same layer number and the reference device located at the same layer number encloses a quadrangle. Thus, the quadrilateral configuration further increases the optical measurement paths of the optical transmitters, e.g., the central device is an optical receiver, the reference device is located at least 4 different orientations of the central device, each optical transmitter may form at least 3 optical measurement paths; the central device is a light emitter, the reference devices are positioned at least 4 different orientations of the central device, and the central device forms at least 4 optical measurement paths.

According to a first aspect, a PPG module is disposed in an electronic device; the geometric center of the central device is positioned at the geometric center of the plane where the PPG module is positioned; or the luminous center of the central device is positioned at the geometric center of the plane where the PPG module is positioned; or the photosensitive center of the central device is positioned at the geometric center of the plane where the PPG module is positioned. Thus, the position of the central device is related to the shape of the electronic equipment, and the central device is arranged in the geometric center of the plane where the PPG module is located, so that the PPG module is convenient to measure human 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 light receiver can be increased, the ambient light is more sensitive, and the measurement accuracy is reduced.

According to a first aspect, if the PPG module is used to monitor heart rate, the distance between the light receiver and the light emitter in the PPG module is between [1mm,10mm ]; if the PPG module is used for monitoring blood oxygen parameters, the distance between the light receiver and the light emitter in the PPG module is more than 10mm. Thus, in different measurement scenarios, the distance ranges between the light receiver and the light emitter are different, and the distance between each light emitter and the light receiver can be set for different measurement ranges.

In a second aspect, the present application provides a method for measuring a PPG signal, applied to an electronic device, where the electronic device includes a processor and a PPG module electrically connected to the processor, where the PPG module is as in the first aspect and any implementation manner of the first aspect, and the method includes: acquiring a use scene of the electronic equipment; determining a measurement mode matched with a use scene according to the use scene of the electronic equipment; controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode; and determining a measurement result of the PPG module according to the PPG signal output by the measurement mode.

Therefore, by adopting the PPG signal measurement mode, different measurement modes (namely different LEDs and different PDs) are started in different use scenes instead of the same measurement mode, so that the measurement accuracy is improved, the problem that physiological parameters of a human body cannot be monitored in certain scenes, such as low-temperature and high-altitude use scenes, the high perfusion rate is required, and the monitoring of the human body can be realized only by the path length of an optical measurement path is avoided.

According to a second aspect, the central device of the PPG module is an optical receiver; if the measurement mode is a normal measurement mode, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, including: the following is done for each light emitter in turn: starting the light emitter to emit light signals, and controlling the light receivers adjacent to the light emitter to be connected in parallel; controlling the parallel light receivers to receive the PPG signals; from each PPG signal received, a PPG signal output by the measurement mode is determined.

In this way, in the normal measurement mode, different PPG signals can be obtained by the acquired signals emitted by the light emitters at different positions due to different positions of each light emitter, and PPG signals conforming to the mode can be selected by a plurality of PPG signals.

According to a second aspect, the central device of the PPG module is an optical receiver; if the measurement mode is an energy-saving mode, controlling the operation of the light emitter according to the indication of the measurement mode and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, wherein the PPG signal comprises: controlling each light emitter to be connected in parallel, and lighting the light emitters connected in parallel; controlling each optical receiver to be connected in parallel, and controlling the parallel optical receivers to receive the PPG signals; and taking the received optical signal as a PPG signal output by the energy-saving mode.

Therefore, as each light emitter is connected in parallel, the power of the light emitter can be reduced, and similarly, each light receiver is connected in parallel, and meanwhile, the power consumption of the light receiver is reduced, and further energy-saving measurement is realized.

According to a second aspect, the central device of the PPG module is an optical receiver; if the measurement mode is a motion measurement mode, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, including: each light emitter is sequentially lightened, and the control center device sequentially receives each PPG signal; changing the connection mode between the light emitters into parallel connection, and controlling the central device to receive the PPG signal; changing the connection mode of each light receiver into parallel connection; each light emitter is lightened, and each light receiver connected in parallel is controlled to receive PPG signals; and acquiring an optimal PPG signal as a PPG signal in the motion measurement mode according to each received PPG signal. Therefore, under the motion state, the sensor can displace, overturn and shake to cause optical crosstalk, so that under the motion scene, various measurements are carried out, and different PPG signals can be obtained. Meanwhile, the central device is positioned at the central position of the plane where the PPG module is positioned, and the central position is slightly influenced by displacement, overturning and shaking of the PPG module, so that the accuracy of measurement in a motion state can be improved.

According to a second aspect, the central device 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, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, wherein the PPG signal comprises: sequentially lighting each light emitter, and controlling a light receiver adjacent to the light emitter and farthest from the light emitting center of the light emitter to receive the PPG signal; changing the connection mode between the transmitters into parallel connection and changing the connection mode of the light receivers into parallel connection; illuminating each light emitter and controlling each light receiver connected in parallel to receive PPG signals; and acquiring an optimal PPG signal from each received PPG signal as the PPG signal in a measurement mode corresponding to the low-temperature and high-altitude scene. Thus, long light measurement channels have a higher pulse signal perfusion rate and short light measurement signal channels have a higher signal energy. When the electronic equipment is determined to be in a low-temperature and high-altitude environment, a high perfusion rate is required, and an optical measurement path with a long path is acquired, so that the high perfusion rate is realized, and the accuracy of PPG module measurement is improved.

According to a second aspect, determining a measurement result of a PPG module from a PPG signal output by a measurement mode, includes: judging whether the PPG signal output in the measurement mode meets a preset measurement condition or not; if yes, taking the output PPG signal as a measurement signal; if the signals do not meet the requirements, PPG signals corresponding to the optical measurement channels in each measurement mode are obtained, and the optimal signals are obtained from the obtained PPG signals to serve as measurement signals; from the measurement signal, a measurement result is calculated. Therefore, the PPG signal with the signal quality which does not meet the condition can be avoided, and the problem of inaccurate measurement results is avoided.

According to a second aspect, before acquiring the usage scenario of the electronic device, the method further comprises: controlling each light receiver to receive ambient light; determining a first pose of the electronic device from ambient light; acquiring a worn gesture of the electronic equipment according to the first gesture; and when the worn posture does not meet the preset measurement posture, outputting prompt information to instruct a user to adjust the worn posture of the electronic equipment. Like this, because electronic equipment's wearing gesture can lead to the fact the influence to PPG module measurement (if lead to ambient light increase, reduce PPG module measuring accuracy), can in time prompt user's adjustment electronic equipment's wearing gesture, can improve PPG module and measure human parameter's accuracy.

According to a second aspect, before determining the first pose of the electronic device from ambient light, the method further comprises: determining a second gesture of the electronic device according to the gesture sensor; determining a worn pose of the electronic device from ambient light, comprising: and determining the worn posture of the electronic device according to the first posture and the second posture. In this way, the second gesture of the electronic device can be determined through the sensor, and the worn gesture of the electronic device can be determined through the first gesture and the second gesture, so that the accuracy of the determined worn gesture of the electronic device can be improved.

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 on the memory, which when executed by the one or more processors, cause the electronic device to perform the second aspect and the method of measuring PPG signals of any implementation of the second aspect. Technical effects corresponding to the implementation manner of the third aspect may refer to technical effects corresponding to any implementation manner of the first aspect and the second aspect, and are not described herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic layout diagram of a PPG module shown in an exemplary manner;

FIG. 2 is a schematic diagram illustrating a layout of a PPG module including 3 LEDs;

fig. 3 is a process schematic diagram illustrating a layout of a PPG module;

fig. 4 is a schematic layout diagram of another PPG module shown in an exemplary manner;

FIG. 5 is a schematic diagram illustrating an example of a light emitter including a plurality of dies;

FIG. 6 is a schematic diagram of an exemplary illustration of a PPG module with two levels of LEDs laid out;

fig. 7 is a schematic diagram illustrating an optical receiver having multiple layers and an optical transmitter having multiple layers;

fig. 8 is a schematic layout diagram of a PPG module shown in an exemplary manner;

FIG. 9 is a schematic diagram illustrating an exemplary division of an angle formed between each adjacent two reference devices and a center device into two different angles by a line between the reference devices and the center device;

FIG. 10 is a schematic diagram of an exemplary reference area including reference devices in multiple orientations;

fig. 11 is a schematic diagram of a PPG module with a central device being a light emitter, which is schematically illustrated;

FIG. 12 is a schematic diagram of a wiring enclosure quadrilateral shown schematically between a reference device at the same level and a reference device at the same level;

fig. 13 is a schematic diagram of the various light measurement paths of a PPG module shown by way of example;

fig. 14 is a schematic diagram of the various light measurement paths of a PPG module shown by way of example;

FIG. 15a is a schematic diagram of a worn posture of a smart watch, shown by way of example;

FIG. 15b is a schematic diagram of an exemplary scenario illustrating a user adjusting the worn pose of the smart watch;

FIG. 16 is a schematic diagram illustrating a process of monitoring physiological parameters of a human body by the smart watch of FIG. 15;

fig. 17 is a schematic diagram illustrating a specific process of the electronic device obtaining a PPG signal output by the PPG module under a current use scenario of the electronic device;

fig. 18 is a schematic flow chart of the PPG module for acquiring a PPG signal when the electronic device is in a static state;

fig. 19 is a schematic flow chart of the PPG module for acquiring a PPG signal when the electronic device is in a motion state;

Fig. 20 is a schematic flow chart of PPG signals collected by the PPG module and the electronic device in a low-temperature and high-altitude state.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone.

The terms first and second and the like in the description and in the claims of embodiments of the present application are used for distinguishing between different objects and not necessarily for describing a particular sequential order of objects. For example, the first target object and the second target object, etc., are used to distinguish between different target objects, and are not used to describe a particular order of target objects.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, the plurality of processing units refers to two or more processing units; the plurality of systems means two or more systems.

In this embodiment of the application, the PPG module includes a light emitter and a light receiver (such as PD), where the light emitter LED may emit green light, and the light receiver is used to receive the light emitted by the LED. Fig. 1 shows a PPG module, in fig. 1, the hollow circle is an LED, the LED and the PD are arranged on a PCB board, which in this example adopts a circular shape as shown in fig. 1. The PD is arranged at the center of the round PCB, and 6 LEDs uniformly surround the periphery of the PD. With the PPG module as laid out in fig. 1, only one PD receives the light of the LED, i.e. the layout has only 6 optical measurement channels, resulting in low light efficiency and high power consumption of the PPG module.

The embodiment of the application provides a layout mode of PD and LED in a PPG module, so that the PPG module can effectively improve optical efficiency and reduce power consumption; meanwhile, by adopting the layout mode, the measurement mode can be flexibly adjusted according to the measurement requirement, and the applicability of the PPG module is enhanced.

The PPG module in this application can set up in electronic equipment, and electronic equipment can be wearable equipment, like equipment such as intelligent wrist-watch, bracelet, arm package. Of course, the electronic device may also be other devices, such as a human physiological parameter measuring device, and the embodiment of the application does not limit the specific form of the electronic device. For convenience of explanation, the electronic device is taken as an example of a smart watch.

The smart watch may include a motherboard, a display screen, a battery, and the like. The motherboard may be integrated with a processor, an internal memory, a charging circuit, and the like. Of course, the smart watch may further include other components, and other circuit structures may also be integrated on the motherboard, which is not limited in this embodiment of the present application. The charging circuit of the mobile phone comprises a power management circuit and a charging management circuit. The power management circuit is connected with the lithium battery, the charging management circuit and the processor. Internal memory in the smart watch may be used to store computer executable program code, which may include instructions. The processor executes the instructions stored in the internal memory to perform various functional applications and data processing of the handset. The above-mentioned processor, internal memory, charging circuit, etc. integrated on the main board all comprise one or more chips.

The PPG module in this application includes light emitter and light receiver, and the light emitter can be LED, and the light receiver can be used for receiving the light of light emitter transmission, and this light receiver can be PD, photoresistor (photo resistor), phototransistor (photo transistor), photoelectric converter etc. the PD is taken as an example in this application. The light emitter can adopt a packaging structure or not. The light receiver may or may not adopt a package structure.

In one embodiment, the PPG module comprises: 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; alternatively, the PPG module includes 3 PDs and 4 LEDs. In the following, a layout of a PPG module including a minimum of 3 LEDs is shown in fig. 2, which is a schematic layout of a PPG module including 3 LEDs.

As shown in fig. 2, the PPG module includes 3 LEDs and 4 PDs. Both the LED and the PD are disposed on the PCB board 20. The shape of the PCB 20 may be set according to the shape of the electronic device, in this example, the electronic device is circular, and the PCB 20 may be set to be circular. Alternatively, the PCB 20 may have other shapes, such as a direction, a diamond shape, etc., which are not listed here.

In this example, if the shape of the PCB board is the same as that of the electronic device (such as a smart watch), a PD201 may be disposed at the center of the PCB board 20 (i.e., the plane where the PPG module is located), and 3 PDs, i.e., a PD202, a PD203 and a PD204, are distributed around the PD201, where the PD202, the PD203 and the PD204 are disposed at the periphery of the PD201 and located in different orientations. LEDs are provided between surrounding PDs, that is, LED301 is provided between PD202 and PD204, LED302 is provided between PD202 and PD203, and LED303 is provided between PD204 and PD 203.

In this example, the LED and the PD may adopt a package structure, such as a SIP package (System In a Package, system-in-package).

In this example, three LEDs (i.e., LED301, LED302, and LED 303) and 3 PDs (i.e., PD202, PD203, PD 204) are disposed around PD201, and 3 PDs around PD201 are spaced from 3 LEDs around PD201 in a layout such that each LED is adjacent to 3 PDs, each light emitter can create at least 3 optical measurement paths, improving the optical efficiency of the light emitter.

Fig. 3 is a process schematic diagram illustrating the layout of the PPG module in fig. 2. The layout of fig. 2 will be specifically described with reference to fig. 3.

Specifically, a position setting center device may be selected in the PCB according to the shape of the electronic apparatus. Alternatively, the central device may be disposed at any position of the PCB board. In this example, the central device is disposed on the PCB corresponding to the center of the dial plate. For example, in a case where the dial plate of the smart watch is circular, the shape of the PCB board is the same as that of the dial plate, and the PCB board is disposed opposite to the dial plate, it may be determined that a central device is disposed on the PCB board corresponding to the center of the circle of the circular dial plate. As shown in fig. 3a, the shape of the dial is the same as that of the PCB board, and the center of the dial coincides with that of the PC board, and a central device is disposed at the position of the center of the circular PCB board 20 (when the PCB board is circular, the center of the circle coincides with the geometric center of the PCB board).

Alternatively, the central device may be a PD, or may be an LED, and the central device may be one or a plurality of central devices. In this example, taking PD as an example as a central device, the photosensitive center of the PD201 may be disposed at the geometric center position of the PCB 20. The geometric center of the PD201 may also be disposed at the geometric center position of the PCB 20. Alternatively, in this example, the photosensitive center of the PD201 coincides with the geometric center of the PCB board 20. Through setting up the central device, can confirm the overall arrangement center of this PPG module now, and lay other PD devices or LED devices with the position of central device place as the benchmark for the device in this PPG module lays more regularly.

In this example, a plurality of virtual reference axes are constructed with the geometric center or the photosensitive center of the center device (i.e., PD 201) as the origin. The reference axis may be located for deployment of a reference device of the same type as the central device. The reference axis is positioned for deploying the reference devices, namely the reference devices are arranged based on the reference axis, so that the area where the reference devices are deployed is rapidly determined through the reference axis, and the deployment speed of the reference devices is increased.

The plurality of reference axes may divide the PCB board 20 into a plurality of parts. The plurality of virtual reference axes may be 3 or more. In this example, 3 reference axes are described as an example. As shown in 3a of fig. 3, 3 reference axes are constructed such that the 3 reference axes equally divide the PCB board 20, as shown by reference axes 401, 402 and 403 of fig. 3 a. The 3 reference axes are collected in the photosensitive center of the PD201 and equally divide the PCB 20.

Alternatively, the angle between each two reference axes may be equal or unequal, i.e. the angle between each two adjacent reference devices and the central device may be equal or unequal, e.g. the angle between reference axis 401 and reference axis 403 in 3a is not equal to the angle between reference axis 401 and reference axis 402.

A virtual reference axis is constructed between two adjacent reference axes (i.e., the position where the space of the included angle formed by two adjacent reference devices and the center device among the 3 reference devices is located). The reference axis is used to assist in deploying the reference device, which may or may not be the same as the central device. For example, the reference device may be deployed along the direction of extension of the reference axis, or may be deployed in a position adjacent to the reference axis, and by virtue of the position of the reference axis, the area in which the reference device is deployed may be reduced, reducing the time to determine the area in which the reference device is deployed.

The collection point of each reference axis may be the same as the collection point of each reference axis, or the collection point of each reference axis may be different from the collection point of each reference axis. In this example, the same point of convergence of the reference axes as the reference axes is taken as an example, that is, the reference axes are collected in the geometric center or photosensitive center of the center device PD201, and as shown in 3b in fig. 3, a reference axis 501 is constructed between the reference axes 401 and 403. A reference axis 402 is established between the reference axis 401 and the reference axis 402, and a reference axis 503 is established between the reference axis 402 and the reference axis 403. An included angle θ1 is formed between the reference axis 501 and the reference axis 401, an included angle θ2 is formed between the reference axis 402 and the reference axis 502, and an included angle θ3 is formed between the reference axis 403 and the reference axis 503, and optionally, the included angle θ1, the included angle θclip, and the included angle θ may be the same or different, that is, the included angle formed by the reference axis and the adjacent reference axis may be any angle. In this example, the same angle θ1, angle θ2, and angle θ3 are taken as examples.

As shown in 3b of fig. 3, one PD device is respectively arranged in the directions along which the reference axis 401, the reference axis 402, and the reference axis 403 extend, and the PD device is arranged in the area of the PCB opposite to the circular dial. Alternatively, the reference axis may pass through the photosensitive center or geometric center of the PD device disposed in the reference axis extending direction, and converge at the geometric center or photosensitive center of the center device 201; the reference axis coincides with a centerline of the PD device. As shown in fig. 3c, the PD202 is disposed at a position of the reference axis 401, such that the reference axis 401 may pass through the photosensitive center of the PD202 and the reference axis 401 coincides with a center line of the PD202, and similarly, the PD204 may be disposed at a position of the reference axis 402, the photosensitive center of the PD204 is located on the reference axis 402, and the reference axis 402 coincides with a center line of the PD 203; a PD203 is disposed at a position where the reference axis 403 is located, and a photosensitive center of the PD203 is located on the reference axis 403, and the reference axis 403 coincides with the photosensitive center of the PD 203. In this embodiment, the types of devices on the respective reference axes are the same, and the types of devices on the reference axes are the same as those of the center device. In this example, the devices on the reference axis do not contain a center device, alternatively, the number of devices on each reference axis is 1 or more.

In the layout process, the central device may be referred to as a zeroth level device (or zeroth level device), where the PD202, the PD203, and the PD204 are used as first level PD devices (or first level PD devices, first level reference devices) of the PPG module, where the distance between each PD in the first level PD devices and the central device may be the same or different, and the distance between each PD device in the first level PD devices and the central device may be set based on measurement requirements, which is not limited in this example. Alternatively, the distance between each PD in the first-level PD device and the center device may be the distance between the photosensitive center of each PD in the first-level PD device and the photosensitive center of the center device, or may be the distance between the geometric center of each PD in the first-level PD device and the geometric center of the center device. In this example, the distance between each PD in the first-level PD device and the center device is taken as an example of the distance between the photosensitive center of each PD and the photosensitive center of the center device, and as shown in fig. 3d, the first-level PD device includes a PD202, a PD203, and a PD204, and the photosensitive center of the center device PD201 is a black center dot of 3d in fig. 3. The distances from the devices on the same layer number to the central device except the device on the zeroth layer can be the same, and can also be different according to different functional requirements.

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

After the first level PD device is determined, the light emitters in the PPG module may be laid out based on the reference axis. In this example, the light emitter may be an LED, which may include a light emitting die that may emit red, green, blue light, or the like. In this example, as shown in fig. 3e, the LEDs may be arranged along the direction in which the reference axis extends, with the geometric center of the LED arranged on the reference axis, e.g. the geometric center of the LED301 on the reference axis 502, the geometric center of the LED302 on the reference axis 501, and the geometric center of the LED303 on the reference axis 503. Alternatively, the photosensitive centers of the LEDs arranged in the direction in which the reference axis extends may be located on the reference axis, which is not shown in fig. 3. Alternatively, the devices arranged along the extending direction of the reference axis may be arranged according to the measurement requirement, for example, the devices arranged along the extending direction of the reference axis may be a combination of a plurality of light emitting chips.

In the directions of the reference axis and the reference axis, the device closest to the central device is a first-level device (or a first-layer device), and the like, namely a second-level device and a third-level device from inside to outside, which can be gradually increased. The LEDs 301, 302, and 303 are the first level LED devices (or first layer LED devices, first layer reference devices) of the PPG module, and the distance from each LED in the first level LED devices to the center device may be the same or different. Alternatively, the distance between each LED in the first level and the center device may be the distance between the photosensitive center of each LED in the first level and the photosensitive center of the center device, or may be 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 exemplified by 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 a black center dot in 3 f. The distance between the geometric center of the LED302 and the geometric center of the PD201 is shown as d4 in 3 f. The distance between the geometric center of the LED303 and the geometric center of the PD201 is shown as d5 in 3 f. The distance between the geometric center of the LED301 and the geometric center of the PD201 is shown as d6 in 3f, and the d4, d5, and d6 may or may not be equal. Alternatively, d1, d2, d3, d4, d5, and d6 may be equal or unequal.

In this embodiment, the layout process of the PD and the LED in the PPG module shown in fig. 2 is specifically described. In this embodiment, the reference axes (shown in fig. 3 a) are first determined based on the central device, and at least one reference axis is located between adjacent reference axes. PD and LED devices in the PPG module are distributed from inside to outside along the reference axis or along the extending direction of the reference axis, and the layout mode is rapid.

In this example, the included angles between the 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 laid based on the reference axes are symmetrical to each other in the whole PPG module, and the symmetrical arrangement facilitates flexible adjustment of the lengths of the optical measurement channels according to measurement requirements. And meanwhile, after the reference axis is determined, determining the layout frame of the PPG module. The reference axis is set based on the reference axis, namely, the layout area of other devices is further determined in the layout frame, so that the layout range of the other devices is reduced, and the layout speed is increased. In this example, as shown in fig. 2 and 3e, the central device is a PD, and the surrounding PDs and LEDs of the central device are spaced, so that each LED in the PPG module can form an optical measurement path with the surrounding PD, that is, each LED has 3 optical measurement channels, and under the condition of the same number of PDs, the optical efficiency is improved, and the power consumption is reduced. The devices on the reference axis can be symmetrically arranged based on the reference axis, the layout mode of symmetrically arranged devices is simple, and the device meets the appearance requirement of users. In addition, each LED in the traditional PPG module layout can only be combined with a specific PD to form an optical measurement channel, and other PDs can absorb light energy due to the fact that the interval size is far, so that the problem that effective measurement cannot be carried out is solved.

In some embodiments, multiple light emitting dies may be included in the LED package structure, e.g., LEDs on the reference axis may also include 2 light emitting dies. Alternatively, the color of the plurality of light emitting dies in the LED package may be different, for example, one light emitting die is a red die and the other is an infrared die.

Fig. 4 is a schematic layout diagram illustrating another PPG module, in which an LED package includes a plurality of light emitting dies.

As shown in fig. 4, 3 reference axes and 3 reference axes can be constructed in the PPG module. The reference axis includes: reference axis 401, reference axis 402, and reference axis 403, the included angle between adjacent reference axes may be 120 degrees. The reference axis comprises: reference axis 501, reference axis 502, and reference axis 503, each reference axis may be at an angle of 60 degrees from an adjacent reference axis. The construction process of the reference axis and the reference axis is similar to that of fig. 3, and reference may be made to the related descriptions of fig. 3a and 3b, which will not be repeated here. PD is distributed along the direction of the reference axis, the geometric center or the photosensitive center of the distributed PD is located on the reference axis, and the PD2, the PD3 and the PD4 form peripheral distribution devices of the PPG module. The LED may include two light emitting dies, such as LED305 including light emitting die 3051 and light emitting die 3052, where the light emitted by light emitting die 3051 and light emitting die 3052 may be different, for example, light emitting die 3051 may be an infrared light die or a red light die, or light emitting die 3052 may be a red light die or an infrared light die. In this example, the light emitting die 3051 is exemplified by a red light die, and the light emitting die 3052 is exemplified by an infrared light die. The red light crystal element, the infrared light crystal element and the PD are matched for use, so that the PPG module can monitor blood oxygen of a human body.

As shown in fig. 4, the position of the light emitting die 3051 and the position of the light emitting die 3052 are symmetrically arranged with the reference axis 501 as a symmetry axis. Similarly, the two light emitting cells in the LED304 are symmetrically arranged with the reference axis 502 as a symmetry axis; the two light emitting dies in the LED306 are arranged axisymmetrically with respect to the reference axis 503.

Alternatively, the position of the light emitting die 3051 and the position of the light emitting die 3052 may not be symmetrically arranged based on the reference axis 501 as an axis of symmetry.

In this example, the angles between adjacent reference axes are the same, as are the angles between the reference axes and the adjacent reference axes. The light emitting die in an LED includes two light emitting dies, such as a red light die and an infrared light die. When two wafers in the LED are symmetrically arranged by taking the reference axis as a symmetry axis, the two light sources in the LED are symmetrically arranged, and the light measuring path with the same stroke length as that of the adjacent PD device can be formed.

In some embodiments, the LED may also include three dies, such as a green die, a red die, and an infrared die. As shown in 5a of fig. 5, 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. PD (e.g., PD202, PD203, and PD 204) are arranged in a direction along which the reference axis extends, and the geometric center or photosensitive center of the laid PD is located on the reference axis. LEDs (such as LED307, LED308, and LED 309) are arranged in a direction extending along the reference axis. In this example, the LED307, the LED308, and the LED309 are of the same type and include three light emitting dies, and in this example, the LED308 is taken as an example for illustration, for example, the light emitting die 3081 is a red light die, the light emitting die 3082 is an infrared light die, and the light emitting die 3082 is a green light die. In this example, the light emitting die 3082 and the light emitting die 3081 of the LED308 are symmetrical with each other with the reference axis 501 as a symmetry axis, and the photosensitive center of the light emitting die 3083 is located on the reference axis 501. LED307 and LED309 are similar to LED308 and will not be described in detail herein.

Optionally, in some embodiments, SIP packaging may also be used, and the PD device and the LED device are packaged by installing the current layout to form a complete machine module.

In this example, the LED includes more than 3 kinds of light emitting cells, such as 3 kinds of light emitting cells, the green cell can monitor heart rate of human body, and the red cell and the infrared light cell are used cooperatively, so that blood oxygen of human body can be monitored. Through various crystal elements, the monitoring of the PPG module to various human physiological parameters can be realized, the monitoring content of the PPG module is enriched, and the use scene of the PPG module is enriched.

In some embodiments, the LED and PD may also be die structures, i.e., non-packaged modes. As shown at 5b in fig. 5, 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. PD (e.g., PD2021, PD2031, and PD 2041) are laid out in a direction along which the reference axis extends, and the geometric center or photosensitive center of the laid out PD is located on the reference axis. 3 dies are arranged along the direction in which the reference axis extends, and the three dies are arranged on the PCB 20 independently of each other.

Illustratively, the light emitting die 3081 may be a red light die, the light emitting die 3082 may be an infrared light die, and the light emitting die 3082 may be a green light die. In this example, similar to fig. 5a, the light emitting die 3082 and the light emitting die 3081 are symmetrical with each other about the reference axis 501 as a symmetry axis. The center of the luminescence wafer 3083 is located on the reference axis 501. Similarly, the light emitting die 3072 and the light emitting die 3071 are symmetrical with each other with the reference axis 502 as a symmetry axis. The photosensitive center of the light emitting die 3073 is located on the reference axis 502. The light emitting die 3092 and the light emitting die 3091 are symmetrical with each other with the reference axis 503 as a symmetry axis. The photosensitive center of the light emitting die 3093 is located on the reference axis 503.

In this example, the PD and the LED both adopt a wafer structure, and the wafer structure can flexibly set the positional relationship between the respective wafers due to no package. Meanwhile, the size of the wafer is small, so that the PPG module is small.

In some embodiments, the number of layers of the PD laid out on the reference axis may be different from the number of layers of the LED laid out based on the reference axis.

Fig. 6 shows a schematic diagram of a PPG module with two levels of LEDs laid out. As shown in fig. 6a, the center device is PD201, and PD202, PD203, and PD204 (reference axis not shown in fig. 6 a) are respectively arranged in the reference axis direction. 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 axes, each reference axis may include 2 LEDs thereon, the LEDs 310, 312 and 314 forming a first level LED device, and the LEDs 311, 313 and 315 forming a second level LED device. The light emitting cells of the LED devices of each level may be identical, for example, the light emitting cells in LED313 and the light emitting cells in LED312 are identical (e.g., green light cells).

In another example, the light emitting die in each level of LED devices may be different. As shown in 6b of fig. 6, the first level PD device in the PPG module includes PD202, PD203, and PD204. LEDs 318 and 319 are arranged along the extending direction of the reference axis 501, and the LEDs 319 include a light emitting die 3191 and a light emitting die 3192. The LED318 includes a light emitting die therein, and alternatively, the LED318 emits green light. Similarly, LEDs 316 and 317 are disposed along the direction of extension of reference axis 502, with the structure of LEDs 316 being identical to the structure of LEDs 319. The LEDs 320 and 321 are arranged along the extending direction of the reference axis 503, and the structure of the LED321 is the same as that of the LED 319. The LED316, LED318, and LED320 form a first level LED device, and the LED317, LED319, and LED321 form a second level LED device.

The PPG module in this example includes first level PD device, first level LED device and second level LED device, and the number of piles of light emitter and the number of piles of light receiver are different promptly, sets up multilayer light emitter, promotes the flexibility of overall arrangement. If the LED layout is concentrated, the optical signal is disturbed and absorbed due to skin hair, black nevus, scar, tattoo, etc., thereby causing absorption of the optical signal, resulting in a problem of failure of monitoring. The LED and PD devices in the example form a distributed layout, so that the large-scale optical penetration of the part to be tested is effectively carried out, the device concentration condition can be improved, meanwhile, the distributed layout of the LED devices is beneficial to dispersing the device heat, the temperature characteristic of the PPG module is improved, and the harmful temperature rise caused by energy concentration is avoided. In the traditional PPG module, the optical measurement path is single, larger skin area cannot be covered, and the influence of the skin quality difference of the measurement points is easy; or the LED devices are arranged in a concentrated mode, so that the problem of heat accumulation of the PPG module is caused.

In yet another embodiment, the number of layers of the optical receiver and the number of layers of the optical transmitter may each be multiple. As shown in fig. 7, the reference axis 401, the reference axis 402, and the reference axis 403 in fig. 7a divide the PCB board 20 into 3 equally sized portions. The PD202 and the PD206 may be laid out in a direction along the reference axis 401. PD204 and PD207 may be routed along a direction in which reference axis 402 extends. PD203 and PD206 may be laid out in a direction along the reference axis 403. The distances between two adjacent PDs on the reference axis may or may not be equal, for example, the distance between PD202 and PD206 may be equal to the distance between PD202 and PD201, or the distance between PD202 and PD206 may not be equal to the distance between PD202 and PD 201.

When the first-stage PD device and the second-stage PD device are set, the first-stage LED device, the second-stage LED device, the third-stage LED device, and the fourth-stage LED device may be set based on the reference axis as shown in 7b of fig. 7. Specifically, as shown in fig. 7b, the LED326, the LED327, the LED328 and the LED329 may be arranged along the extending direction of the reference axis 501, wherein the LED326 and the LED327 are used for monitoring different physiological parameters of the human body, for example, the LED326 may emit green light for monitoring the heart rate of the human body, and the LED327 includes two red light crystal elements and an infrared light crystal element and may be used for monitoring the blood oxygen of the human body. Similarly, LEDs 322, 323, 324, and 325 may be disposed along the direction in which reference axis 502 extends, and LEDs 330, 331, 332, and 333 may be disposed along the direction in which reference axis 503 extends. In this example, the first level LED device includes: LED326, LED322, LED330. The second level LED device includes: LED327, LED323, LED331; the third-level LED device includes: LED328, LED324, LED332; the fourth level LED device includes: LED329, LED325, LED333.

In one embodiment, the multi-layer devices laid out based on the reference axis may be of different device types. As shown in fig. 8, 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 similar to that of fig. 3, and reference may be made to the related descriptions of fig. 3a and 3b, which will not be repeated here. The PD is laid out in a direction in which the reference axis extends, and a geometric center or a photosensitive center of the laid-out PD is located on the reference axis. For example, PD203, PD202, and PD204 in fig. 8. The LED312, the PD335, and the LED313 are sequentially arranged along the direction in which the reference axis 501 extends. The LEDs 310, PD334, and LED311 are sequentially arranged along the direction in which the reference axis 502 extends. LED314, PD336, and LED315 are sequentially arranged along the direction in which reference axis 503 extends. The distance between two adjacent devices on the reference axis may be the same or different, e.g., the distance between the LED310 and the PD334 is equal to the distance between the PD334 and the LED311. Alternatively, the distance between the first layer device and the center device on the reference axis may be set according to the measurement requirements.

In some embodiments, the angle between each of the reference axes and the reference axis may be different. As shown in 9a of fig. 9, the PPG module includes a central device 201, a reference axis 401, a reference axis 402, and a reference axis 403,3, where the reference axes are equally divided into the PCB 20; reference axes, such as reference axis 501, reference axis 502, and reference axis 503, are established between adjacent reference axes. The construction of the reference axis and the reference axis is similar to that of fig. 3, and reference may be made to the relevant descriptions of fig. 3a and 3b, and will not be repeated here. The PD202 is disposed along the reference axis 401 extending direction; disposing PD204 along the reference axis 402 extending direction; the PD203 is disposed along the reference axis 403 extending direction. The angle α between reference axis 501 and reference axis 401, the angle β between reference axis 502 and reference axis 401, and the angle γ between reference axis 503 and reference axis 402. The included angle alpha is unequal to the included angle beta, and the included angle beta is unequal to the included angle gamma, namely, the included angle alpha, the included angle beta and the included angle gamma are unequal. As shown in 9b of fig. 9, the LED301 is arranged in a direction in which the reference axis 502 extends, the LED302 is arranged in a direction in which the reference axis 501 extends, and the LED303 is arranged in a direction in which the reference axis 503 extends; the PPG module shown in 9b is formed.

By adopting the layout mode of the PPG module shown in fig. 9b, because the included angles between the reference axis and the two adjacent reference axes are different, the LEDs with the geometric center/photosensitive center positioned on the reference axis can generate optical measurement channels with different lengths, and the differential optical path channels can obtain PPG signals of different blood vessel positions, different optical penetration depths and different blood perfusion of skin tissues when measuring signals.

In another embodiment, other arrangements may be used to obtain differential light path paths for the LEDs. As shown in the layout diagram of fig. 9, 9 c. A central device PD201 is disposed at a central position in the PPG module (i.e., a geometric central position of the PCB 20). The PPG module further comprises a reference axis 401, a reference axis 402 and a reference axis 403 during the layout process; reference axis 501, reference axis 502, and reference axis 503. The construction process of the reference axis and the reference axis is similar to that of fig. 3, and reference may be made to the related descriptions of fig. 3a and 3b, which will not be repeated here. The PD202 is disposed along the reference axis 401 extending direction; disposing PD204 along the reference axis 402 extending direction; the PD203 is disposed along the reference axis 403 extending direction. The reference axis is used to assist in determining the location of the LED layout. In this example, the location at which the LEDs are routed can be determined at a location near the reference axis and PPG measurement requirements.

For example, PPG measurement requirements include measuring heart rate, where it is desirable to have LEDs disposed offset from PD, and LEDs 302 disposed along the direction of extension of reference axis 501 and on a side offset from reference axis 501. The LED301 is disposed along the direction in which the reference axis 502 extends and at a position on one side away from the reference axis 502. The LED303 is disposed along the direction in which the reference axis 503 extends and at a position offset from one side of the reference axis 503. In this example, no device is deployed where the reference axis is.

It should be noted that, in this example, the included angle between the reference axis and the adjacent reference axis may be the same or different.

Because the LEDs are not distributed in the extending direction of the reference axis, the LEDs can also generate optical measurement channels with different lengths to form differential light paths, so that PPG signals are various, and the accuracy of heart rate measurement can be improved.

In the above embodiment, one reference axis is constructed between two adjacent reference axes, and in some embodiments, multiple (e.g., 2 or more) reference axes may be constructed between two adjacent reference axes.

For example, as shown in 10a of fig. 10, the center device (PD 201) of the PPG module is disposed at the geometric center of the PCB 20. The PPG module further comprises a build reference axis 401, a reference axis 402 and a reference axis 403 during the layout process, in this example, the angles between adjacent reference axes are the same. Two reference axes may be constructed between two adjacent reference axes, as shown at 10a in fig. 10, and reference axes 501 and 504 are constructed between reference axes 401 and 403. Constructing reference axis 502 and reference axis 505 between reference axis 401 and reference axis 402; between the reference axis 402 and the reference axis 403, a reference axis 503 and a reference axis 506 are constructed.

The PD202 is disposed along the reference axis 401 extending direction; disposing PD204 along the reference axis 402 extending direction; the PD203 is disposed along the extending direction of the reference axis 403, and the process of laying out the PD device on the reference axis may refer to the related description of 3c in fig. 3, which will not be described herein. The LEDs 305 are arranged along the direction of extension of the reference axis 501; arranging the LEDs 302 along a reference axis 504 extending direction; the LEDs 301 are arranged along the direction of extension of the reference axis 505; disposing the LEDs 304 along a reference axis 502 extending direction; an LED303 is disposed along the direction in which the reference axis 503 extends; the LEDs 306 are disposed along the direction of extension of the reference axis 506. The process of arranging the LED devices along the reference axis may be described with reference to fig. 3e, and will not be described herein.

Alternatively, the number of reference axes between each adjacent two reference axes may also be different. As shown in fig. 10b, the center device (PD 201) of the PPG module is disposed at the geometric center of the PCB 20. The PPG module also includes a reference axis 401, a reference axis 402, and a reference axis 403 during layout. Between the reference axis 401 and the reference axis 403, a reference axis 501 and a reference axis 504 are constructed. Constructing reference axis 505 between reference axis 401 and reference axis 402; a reference axis 503 is constructed between the reference axis 402 and the reference axis 403. The PD202 is disposed along the reference axis 401 extending direction; disposing PD204 along the reference axis 402 extending direction; the PD203 is disposed along the reference axis 403 extending direction. The LEDs 305 are arranged along the direction of extension of the reference axis 501; arranging the LEDs 302 along a reference axis 504 extending direction; the LEDs 301 are arranged along the direction of extension of the reference axis 505; LED303 is disposed along a direction along which reference axis 503 extends. The process of laying out the PD device on the reference axis may refer to the related description of 3c of fig. 3, and the process of laying out the LED device along the reference axis may refer to the related description of 3e of fig. 3, which will not be repeated here.

In some embodiments, the central device located at the geometric center of the PCB board 20 may also be a light emitter. As shown in 11a of fig. 11, an LED300 is disposed at a geometric center position of the PCB board 20. Similar to 3a of fig. 3, 3 virtual reference axes are constructed with the geometric center of the PCB 20 as a circle point, so that the 3 reference axes equally divide the PCB 20, such as reference axis 401, reference axis 402, and reference axis 403 shown in fig. 11 a. The 3 reference axes are collected in the light emitting center of the LED300 and equally divide the PCB 20. A virtual reference axis is constructed between two adjacent reference axes, and each reference axis is collected in the geometric center of the PCB board 20. As shown in 11a of fig. 11, a reference axis 501 is constructed between the reference axis 402 and the reference axis 403; constructing a reference axis 502 between the reference axis 402 and the reference axis 401; a reference axis 503 is constructed between the reference axis 401 and the reference axis 403. The angle between each reference axis and the adjacent reference axis may be different or the same.

Devices of the same type as the central device are arranged along the direction in which the reference axis extends. As shown in fig. 11a, the LED301 is disposed along the direction in which the reference axis 402 extends, and one center line of the LED301 coincides with the reference axis; the LEDs 302 are arranged along the direction in which the reference axis 401 extends, and one center line of the LEDs 302 coincides with the reference axis; the LED303 is disposed along a direction in which the reference axis 403 extends, and one center line of the LED303 coincides with the reference axis. Disposing the PD204 along a direction in which the reference axis 501 extends, a centerline of the PD204 may coincide with the reference axis 501; the PD202 is disposed along a direction in which the reference axis 502 extends, a centerline of the PD202 may coincide with the reference axis 502, the PD203 is disposed along a direction in which the reference axis 503 extends, and a centerline of the PD203 may coincide with the reference axis 503.

Alternatively, the device disposed at the center of the PCB 20 may be a combination of a plurality of LEDs. As shown at 11b in fig. 11, the central device includes a combination of an LED300 and an LED322, where the LED300 may include a single color die (e.g., a green die), the LED322 may include a dual color die (e.g., a red die and an infrared die), and the combination of the LED300 and the LED322 may enable monitoring of various physiological parameters of the human body. When the central device includes two or more central devices, a symmetry axis of the central device may be constructed, the symmetry axis of the central device may pass through a straight line of a geometric center point of the PCB 20 and equally divide the PCB 20, for example, a diameter of the circular PCB 20 in fig. 2b may be used as the symmetry axis of the central device, the LEDs 300 and 322 may be symmetrically disposed based on the symmetry axis of the central device, a first center line of the LEDs 300 and a first center line of the LEDs 322 are collected at the geometric center of the PCB 20, and the first center line of the LEDs 300 and the first center line of the LEDs 322 are perpendicular to the symmetry axis of the central device.

The reference axes 401, 402, 403 are constructed based on the center devices (i.e., LEDs 300 and 322). As shown in 11b of fig. 11, a reference axis 501 is constructed between the reference axis 402 and the reference axis 403; constructing a reference axis 502 between the reference axis 402 and the reference axis 401; a reference axis 503 is constructed between the reference axis 401 and the reference axis 403. The construction of the reference axes and reference axes is described with reference to fig. 3, and will not be described in detail here.

A device of the same type as the central device is arranged in the direction in which the reference axis extends, i.e. in this example two LED combinations are arranged in the direction in which the reference axis extends, which may or may not coincide with the LED combinations in the central device. For example, the combination of two LED dies may be used, the packaging of LEDs may be used, or one LED die may be used, and one LED package structure may be used. As shown in fig. 11b, the LED316 and the LED317 are provided in a direction along which the reference axis 402 extends, the LED318 and the LED319 are provided in a direction along which the reference axis 401 extends, and the LED320 and the LED321 are provided in a direction along which the reference axis 403 extends. PD204 is provided along the direction in which reference axis 501 extends, PD202 is provided along the direction in which reference axis 502 extends, and PD203 is provided along the direction in which reference axis 503 extends.

The LEDs 316, 318, and 320 may be first level LED devices, and the LEDs 317, 319, and 321 are second level LED devices. The first-level LED device and the second-level LED device can monitor different physiological parameters of the human body, for example, the LEDs in the first-level LED device may include a single-color wafer (such as a green wafer) to monitor the heart rate of the human body; the LEDs in the second level LED device may include multicolor dies (e.g., red and infrared dies) to monitor the blood oxygen of the human body.

In addition, the wafer in the LED can also be the wafer of other colors, can adopt the wafer of different colors according to the monitoring demand, for example, can also include blue light wafer in the LED.

In some embodiments, the LEDs and PD layout in the PPG module may also be other shapes, e.g., the PD and LEDs may form a square layout structure. The PPG module of the directional layout is specifically described below with reference to fig. 12.

For example, as shown in fig. 12a, PD800 is arranged in the geometric center of PCB 20. Reference axis 601, reference axis 602, reference axis 603, and reference axis 604 are constructed based on PD800. In this example, reference axis 601 and reference axis 603 are parallel and both converge at the photosensitive center of PD800, and reference axis 602 and reference axis 604 are parallel and both converge at the photosensitive center of PD800. The reference axis 601 is perpendicular to the reference axis 602.

Similarly, reference axes such as reference axis 701, reference axis 702, reference axis 703 and reference axis 704 shown in fig. 12a are constructed between two adjacent reference axes. Reference axis 701 and reference axis 703 are parallel and all converge at the photosensitive center of PD800, reference axis 702 and reference axis 704 are parallel and all converge at the photosensitive center of PD800, and reference axis 701 is perpendicular to reference axis 702.

The PD801 is provided in the direction in which the reference axis 601 extends, the PD802 is provided in the direction in which the reference axis 602 extends, the PD803 is provided in the direction in which the reference axis 603 extends, and the PD804 is provided in the direction in which the reference axis 604 extends. The LED901 is disposed in a direction in which the reference axis 701 extends, the LED902 is disposed in a direction in which the reference axis 702 extends, the LED903 is disposed in a direction in which the reference axis 703 extends, and the LED904 is disposed in a direction in which the reference axis 704 extends. As shown in fig. 12a, the wiring of the device other than the PD800 forms a square structure. In this example, the LED includes three light emitting dies, which may be, for example, green, red, and infrared dies.

Alternatively, as shown in 12b of fig. 12, the LEDs 900 are arranged in the geometric center of the PCB board 20. A reference axis 601, a reference axis 602, a reference axis 603, and a reference axis 604 are constructed based on the LED900. In this example, reference axis 601 and reference axis 603 are parallel and each converge at the center of emission of LED900, and reference axis 602 and reference axis 604 are parallel and each converge at the center of emission of LED900. The reference axis 601 is perpendicular to the reference axis 602.

Similar to 12a, a reference axis 701, a reference axis 702, a reference axis 703, and a reference axis 704 are constructed between two adjacent reference axes. The LED905 is provided in the direction in which the reference axis 601 extends, the LED906 is provided in the direction in which the reference axis 602 extends, the LED907 is provided in the direction in which the reference axis 603 extends, and the LED908 is provided in the direction in which the reference axis 604 extends. The PD805 is provided in a direction in which the reference axis 701 extends, the PD806 is provided in a direction in which the reference axis 702 extends, the PD807 is provided in a direction in which the reference axis 703 extends, and the PD808 is provided in a direction in which the reference axis 704 extends. As shown in fig. 12b, the wiring of the devices other than the LED900 forms a square structure. In this example, the LED includes three light emitting dies, which may be, for example, green, red, and infrared dies.

The foregoing embodiments specifically explain a layout manner based on the reference axis and the reference axis in the present application, and the following specifically describes each optical measurement path of the PPG module in the present application in an operating state with reference to fig. 13 and 14.

Fig. 13 is a schematic diagram illustrating each light measurement path of a PPG module.

As shown in fig. 13, the center device of the PPG module is PD1, and one PD device is respectively disposed in the extending direction of each reference axis, such as PD2, PD3, and PD4 in fig. 13. One LED device, such as LED1, LED2, and LED3 in fig. 13, is arranged in each extending direction of the reference axis. In this example, the light emitting center of the LED device on the reference axis is offset from the reference axis, as the light emitting die of LED2 is offset from the reference axis 1301, and similarly, the light emitting die of LED1 and LED3 are each offset from their corresponding reference axes (the reference axes of each of LED1 and LED3 are not shown).

When LED1 is illuminated (i.e., LED1 emits light), at least PD1, PD2, and PD4 each receive light emitted by that LED 1. As shown in fig. 13, the LED1 device can form optical measurement paths, i.e., at least optical measurement paths g1, g4, and g9, with the center device PD1 and the adjacent first-level PD devices (i.e., PD2 and PD 4), respectively. Similarly, when the LED2 is turned on, the LED2 forms optical measurement paths g2, g5, and g6 with the PD1, PD2, and PD3, respectively. When the LED3 is turned on, the LED3 forms optical measurement paths g3, g7, and g8 with the PD1, PD3, and PD4, respectively.

In this example, the photosensitive centers of PD2, PD3, and PD4 are all located on the reference axis, and the light emission centers of LED1, LED2, and LED3 are offset from the reference axis, forming an asymmetric layout with respect to the reference axis. In this example, the reference axis is at the same angle as the adjacent reference axis, and the distance between the LED1 and the PD1 is smaller than the distance from the center of emission in the LED1 to the PD 2. And since the light emission center is deviated from the reference axis, the distance from the light emission center of the LED1 to the PD4 is longer than the distance from the light emission center of the LED1 to the PD2, and therefore, when the LED1 is lighted, the length of the optical measurement path is as follows: g1< g4< g9. Similarly, when the LED2 emits light, the length of the optical measurement path is as follows: g2< g6< g5. For the light emission of the LED3, the length of the optical measurement path is as follows: g3< g8< g7.

Each LED light source can form three optical measurement paths, and the lengths of the three optical measurement paths are different, so that three differential light paths are formed, and PPG signals of different blood vessel positions, different optical penetration depths and different blood perfusion of skin tissues can be obtained in terms of measurement signals. Generally, under the condition of the same spectral wavelength and the same luminous energy, the longer the optical path, the higher the perfusion rate value of the extracted blood perfused PPG signal, but the lower the energy of the corresponding signal, the lower the signal stability. Conversely, when the optical path is about short, the lower the perfusion rate value of the extracted blood perfused PPG signal, but the higher the energy of the signal, the higher the signal stability. In the example, the signal quality difference formed by different signal measurement channels is different, more signal selection of an algorithm can be provided, the signal channels are combined under different scenes and modes, and the accuracy of monitoring the physiological parameters of the human body is improved. In the middle layout mode, the central device is PD1, the displacement of the central position of the PPG module relative to other edge positions is small, the central device is not easy to separate from a part to be measured, the situation that external ambient light or light of an LED light source in a sensor directly enters a light receiver during measurement is avoided, serious interference is caused to PPG signals, and the anti-interference capability under a motion state is improved. Meanwhile, each LED is simultaneously received by the adjacent PD, so that the optical efficiency of the PPG module is effectively improved, and the power consumption is reduced.

Fig. 14 is a schematic diagram illustrating each light measurement path of a PPG module.

As shown in fig. 14, the central device of the PPG module is an LED4, and one LED device is respectively arranged in the extending direction of each reference axis, such as LED4, LED5, LED6 and LED7 in fig. 14. One PD device is arranged in each extending direction of the reference axis, such as PD5, PD6, and LED7 in fig. 14. In this example, the light emitting center of the LED device on the reference axis is offset from the reference axis, as the light emitting die of the LED5 is offset from the reference axis 1401, and similarly, the light emitting die of the LED6 and the LED7 are each offset from their own corresponding reference axes (the reference axes of the LEDs 6 and 7 are each not shown).

When LED1 is illuminated (i.e., LED1 emits light), at least PD5, PD6, and PD7 receive light emitted by LED 4. As shown in fig. 14, the first-level LED devices may form optical measurement paths with adjacent first-level PD devices, respectively. For example, the LED5 may form an optical measurement path k5 with an adjacent PD5, and the LED5 may form an optical measurement path k6 with an adjacent PD 6. Similarly, when the LED6 is turned on, the LED6 forms optical measurement paths k7 and k8 with the PD6 and the PD7, respectively. When the LED7 is turned on, the LED7 forms optical measurement paths k4 and k9 with the PD7 and the PD5, respectively. In this example, the center of emission of LED4 is offset from the geometric center of PCB board 20, and the centers of emission of LEDs 5, 6, and 7 are offset from the reference axis, forming an asymmetric layout with respect to the reference axis. In an example, the reference axis is at the same angle as the adjacent reference axis, 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 PD 5. If the LED5 is on, since the light emitting die of the LED6 deviates from the reference axis, the distance from the light emitting die to the PD6 is smaller than the distance from the light emitting die to the PD5, that is, the length of the optical measurement path is as follows: k6< k5. Similarly, when the LED6 is lit, the length of the optical measurement path is sized to be: k8< k7. When the LED7 is lit, the length of the optical measurement path is sized to be: k4< k9. In this example, each LED may form at least 2 optical measurement paths of different lengths, which may provide more signal options for the algorithm; however, in the conventional measurement module, measurements of different indexes are often fixed on certain specific signal channels, and cannot provide more channel selection for the algorithm.

The PPG module in the embodiment of the application may be disposed in a wearable electronic device, and is used for monitoring physiological parameters of a human body. For example, the PPG module is disposed in a smart watch. When the user wears the intelligent watch, the human physiological parameters can be monitored through the PPG module in the intelligent watch. In different usage scenarios, the process of monitoring physiological parameters of human body by the smart watch will be specifically described with reference to fig. 15 and 16.

Fig. 15 is a schematic diagram illustrating a usage scenario of a smart watch.

As shown in fig. 15a (1), the user wears the smart watch 10, and a PPG module is disposed in the smart watch 10 and electrically connected to a processor in the smart watch. When the PPG module is started and attached to the skin of a user, the monitoring of the physiological parameters of the human body can be realized. In this example, as shown in fig. 15a (2), the PPG module has a center device PD1, and one PD device, namely PD2, PD3, and PD4, is respectively arranged along the extending direction of each reference axis. Along the extension direction of each reference axis, there is provided one LED device, such as LED1, LED2 and LED3 in fig. 15a (2).

The user can manually start the human body physiological parameter monitoring function of the intelligent watch, or after the intelligent watch detects a preset triggering condition, the human body physiological parameter monitoring function of the intelligent watch is started, and the triggering condition can be a monitoring time preset by the user. When the human physiological monitoring function is activated, the steps shown in fig. 16 may be performed.

Fig. 16 is a schematic diagram illustrating a process of monitoring physiological parameters of a human body by the smart watch of fig. 15.

Step 1601: the electronic device detects a gesture of the electronic device.

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

Alternatively, if the processor obtains the gesture of the electronic device, step 1602 may be directly executed.

Step 1602: the electronic device activates PD1, PD2, PD3 and PD4, collecting ambient light.

Illustratively, the processor may control PD1, PD2, PD3, and PD4 to activate, and 4 PD devices may receive ambient light of the environment in which the electronic device is located. The processor may acquire the collected optical signals of PD1, PD2, PD3, and PD4 in the same period. The PD1, PD2, PD3, and PD may transmit the collected optical signals to the processor.

Step 1603: the electronic device determines whether the ambient light exceeds a preset ambient light threshold. If the ambient light threshold is exceeded, step 1604 is performed, and if the ambient light threshold is not exceeded, step 1606 is performed.

The preset ambient light threshold may be an ambient light collected by each PD of the smart watch stored in advance in the electronic device under a preset posture, and the maximum ambient light is obtained as the ambient light threshold corresponding to the posture, where the preset posture may be a posture of the smart watch when the PPG module monitors a physiological parameter of a human body. For example, in a posture in which the smart watch is fully attached to the skin of a human body, the ambient light collected by each of PD1 to PD4 is acquired and denoted as S1 to S4. And acquiring the maximum ambient light from S1, S2, S3 and S4 (for example, S1< S2< S3< S4), and taking the S4 as an ambient light threshold corresponding to the current gesture. If the preset gesture is one, the ambient light threshold (S4) corresponding to the gesture of the smart watch completely fitting the human skin can be used as the preset threshold.

Optionally, if there are multiple preset gestures, a maximum value may be selected from the ambient light of each preset gesture as the preset ambient light threshold. For example, the ambient light in the posture 1 includes S1 and S4, the ambient light in the posture 2 includes S2 and S5, the ambient light in the posture 3 includes S3 and S6, and if S1< S2< S3< S4< S5< S6, S6 is selected as the preset ambient light threshold.

Illustratively, the processor receives the ambient light transmitted by the 4 PDs, and may compare the ambient light collected by each PD to a preset ambient light threshold. When the processor detects that there is no ambient light exceeding the ambient light threshold, step 1606 may be performed. Step 1604 may be performed when the processor detects the presence of ambient light exceeding an ambient light threshold.

Step 1604: the electronic device obtains a pose of the electronic device.

For example, the processor may determine the pose of the electronic device from the ambient light collected by each PD device. In this example, PD1 is located the intermediate position of PCB board, and PD2, PD3 and PD4 are located different directions respectively, and when the electronic equipment that the user was worn is not fully laminated at user's skin, can lead to the intake of a certain direction big, based on this, the position of not laminating with human skin in the processor can confirm the PPG module.

For example, in the posture situation as shown in fig. 15a (1), the processor in the smart watch activates PD1, PD2, PD3 and PD4 to collect the ambient light of the environment in which the smart watch is located. As shown in fig. 15a (2), the amount of light entering the PD2 in the PCB 20 of the PPG module is greater than the amounts of light entering the PD3 and the PD 4. PD1 is located the central point of PCB board 20, and when this PPG module completely laminated human skin, current PD 1's light inflow is close 0, and when one side is higher than the opposite side in this PPG module, ambient light can get into PD device around and be located the PD1 of central point. As shown in fig. 15a (2), when the processor detects that the ambient light of the PD2 is higher than the ambient light of the other PD devices and the ambient light of the PD2 exceeds the preset threshold, the processor may determine that the PD2 is located higher than the other PD devices, i.e., the PD2 is located in a position not adhered to the skin of the human body.

Optionally, after determining the portion of the electronic device that is not attached to the skin, the processor may further determine the current posture of the electronic device based on the posture of the electronic device detected in step 1601.

Step 1605: the electronic device reminds the user to adjust the posture of the electronic device.

For example, the processor in the electronic device may output a prompt message according to the posture of the electronic device, so as to remind the user to adjust the posture of the electronic device. For example, the processor may control the voice module of the smart watch to output voice, audibly instruct the user to adjust the posture of the smart watch; the processor may also control a display screen of the smart watch to display adjustment information, which may be text information.

The processor detects whether the posture of the electronic device has changed, and if so, may re-execute step 1601.

After the user views the prompt information, the user can adjust the gesture of the electronic device according to the prompt information. For example, as shown in fig. 15b (1), the user adjusts the posture of the smart watch from 15a (1) to 15b (1). The smart watch may 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 respective light incoming amounts in each of PD2, PD3, and PD4 are the same. If the processor detects that the collected ambient light does not exceed the preset ambient light threshold, step 1606 is performed.

Step 1606: the electronic equipment acquires a PPG signal output by the PPG module under the current use scene of the electronic equipment.

For example, when the electronic device is in different usage scenarios, the PPG module may employ different measurement modes and output PPG signals collected in the modes. The specific process of the electronic device obtaining the PPG signal output by the PPG module under the current use scenario of the electronic device may refer to fig. 17, and the specific process is as follows:

step 1701: the electronic device obtains scene data of a current use scene of the electronic device.

For example, a processor in an electronic device may obtain scene data currently used by the electronic device, which may include a combination of one or more of the following: acceleration of the electronic equipment, air pressure, temperature or humidity of the environment where the electronic equipment is located, and the like.

The scene data may be obtained by other sensor monitoring environments, for example, an acceleration sensor in a smart watch may detect acceleration of the electronic device; a temperature sensor in the smart watch may detect the temperature of the environment.

Step 1702: the electronic device determines a usage scenario for the electronic device. If it is determined that the electronic device is in a static state, step 1703 is executed, and 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, high altitude environment, step 1705 is performed.

Illustratively, the processor may determine a usage scenario of the electronic device based on the scenario data. Optionally, the electronic device may store scene data corresponding to each usage scenario, and when the processor detects that the acquired scene data matches the stored scene data, the usage scenario of the electronic device may be determined.

For example, the electronic device may store a plurality of usage scenarios, scenario 1: static scenes; scene 2: a dynamic scene; scene 3: low temperature, high altitude scenes. The acquired scene data includes: acceleration V1, barometric pressure data P1; temperature data C1. If the processor detects that the speed V1 is in a speed range [ Vth1, vth2] in the static scene; it is determined that the electronic device is in a static scenario. If the processor detects that the air pressure data P1 is in the air pressure range [ Pth1, pth2] corresponding to the high altitude, and the temperature data C1 is in the low temperature range [ Cth1, cth2], determining that the electronic equipment is in a low temperature and high altitude scene. If the processor detects that the velocity V1 is within the velocity range Vth3, vth4 in the motion scene, it is determined that the electronic device is in the motion scene. Wherein Vth1< Vth2< Vth3< Vth4; pth1< Pth2; cth1< Cth2.

Alternatively, if the processor detects that the speed satisfies the 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.

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

Illustratively, at least two measurement modes of the PPG module are used in the static state, such as a normal measurement mode and a power saving mode. Fig. 18 is a schematic flow chart of the PPG module collecting PPG signals under static state of the electronic device, and the following specifically describes a process of outputting the collected PPG signals by the PPG module under static state with reference to fig. 18, which includes the following sub-steps:

sub-step 1801: the electronic device determines a measurement mode when stationary. If it is determined that normal measurement mode is employed, sub-step 1802 is performed, and if it is determined that power saving mode is employed, sub-step 1806 is performed.

Illustratively, the static scene includes a plurality of measurement modes, for example, the static scene may include a normal measurement mode and a power saving mode. The triggering condition of the normal measurement mode may be: within a first preset period of time. The triggering condition of the energy saving mode may be: the operation period is in a second period, such as a period in which the user can rest, e.g., 23:00-6:00. Alternatively, the trigger conditions of the normal measurement mode and the energy saving mode may further include other contents, for example, the trigger conditions of the normal measurement mode and the energy saving mode may further be an instruction that the user instructs to operate in the normal measurement mode/the energy saving mode is received.

Sub-step 1802: the electronic device lights up LED1 and controls PD1, PD2, and PD4 in parallel, and controls PD1, PD2, and PD4 to receive signals.

For example, if the processor determines that the normal measurement mode is adopted, the processor may instruct each light emitter to sequentially emit light; the processor also instructs an optical receiver adjacent to the optical transmitter to be connected in parallel and to receive the optical signal.

For example, as shown in (2) of fig. 15b, the processor may instruct the LED1 to light up, and the PD adjacent to the LED1 includes: PD1, PD2 and PD4. The processor may control PD1, PD2, and PD4 in parallel and control PD1, PD2, and PD4 to receive signals. When the LED1 is lighted, referring to fig. 13, optical measurement light paths g1, g4, and g9 can be formed.

It should be noted that the processor may control the serial and parallel switching manner between PD devices by outputting the control signal. In this example, the serial and parallel switching between PD devices may refer to the serial and parallel switching manner between components in the conventional technology, which is not described herein.

In normal mode, after the processor receives the PPG signal when LED1 is on (denoted sig_1), the processor may instruct the next LED to be on (e.g., sub-step 1803 is performed), while controlling LED1 to go off, and instructs PD1, PD2, and PD4 to stop receiving light signals.

Sub-step 1803: the electronic device lights the LED2, and controls the PD1, PD2, and PD3 to be connected in parallel, and controls the PD1, PD2, and PD3 to receive signals.

Illustratively, as shown in (2) of fig. 15b, the processor may instruct the LED2 to light up, and the PD adjacent to the LED2 includes: PD1, PD2 and PD3. The processor may control PD1, PD2, and PD3 in parallel and control PD1, PD2, and PD3 to receive signals. When the LED2 is lighted, referring to fig. 13, optical measurement light paths g2, g5, and g6 may be formed.

In normal mode, after the processor receives the PPG signal when LED2 is on (denoted sig_2), the processor may instruct the next LED to be on (e.g., sub-step 1804 is performed) while controlling LED2 to go off and instruct PD1, PD2, and PD3 to stop receiving light signals.

Sub-step 1804: the electronic device lights the LED3, and controls the PD1, PD3, and PD4 to be connected in parallel, and controls the PD1, PD3, and PD4 to receive signals.

Illustratively, as shown in (2) of fig. 15b, the processor may instruct the LED3 to light up, and the PD adjacent to the LED3 includes: PD1, PD3 and PD4. The processor may control PD1, PD3, and PD4 in parallel and control PD1, PD3, and PD4 to receive signals. When the LED3 is lighted, referring to fig. 13, optical measurement light paths g3, g7, and g8 can be formed. The PD1, PD3 and PD4 are connected in parallel and the processor can acquire the PPG signal (denoted Sig_3) of the LED 3.

When the processor detects the PPG signals of all LEDs, the LED3 is turned off, and each PD is controlled to stop receiving signals.

Sub-step 1805: the PPG module outputs a PPG signal collected in a normal measurement mode. After this step, step 1607 is performed.

Illustratively, the processor may determine the signal output by the normal measurement mode based on the 3 PPG signals received. For example, the processor may select, from the 3 PPG signals received (i.e., sig_1, sig_2, and sig_3), the PPG signal with the best signal quality as the PPG signal collected by the PPG module in the normal measurement mode.

In this example, other ways of determining the signal output by the normal measurement mode may also be employed. For example, the processor may further obtain any one signal from the 3 PPG signals as a PPG signal collected by the PPG module in the normal measurement mode. Optionally, the processor may further calculate an average signal of the 3 PPG signals as a PPG signal collected by the PPG module in a normal measurement mode.

Sub-step 1806: the electronic equipment controls the LEDs 1, 2 and 3 to be connected in parallel and lights the LEDs 1, 2 and 3; PD1, PD2, PD3, and PD4 are controlled to be connected in parallel and receive signals. For example, if the processor determines that the energy saving mode is employed, the processor may instruct the light emitters to be in parallel and instruct the emitters to emit light; the processor also instructs the optical receivers to connect in parallel and receive the optical signals.

For example, as shown in fig. 13, the processor may instruct the LEDs 1, 2, and 3 to be connected in parallel and light the LEDs 1, 2, and 3. The processor controls PD1, PD2, PD3 and PD4 to be connected in parallel and to receive signals. Because the LEDs 1, 2 and 3 are connected in parallel, the power of the light emitter is reduced, and similarly, the PD1, 2, 3 and 4 are connected in parallel, the power consumption of the PD is reduced, and the purpose of energy-saving measurement is achieved.

PD1, PD2, PD3 and PD4 receive the optical signal at the same time, obtain a PPG signal, record as Sig_4.

Sub-step 1807: the PPG module outputs a PPG signal collected in an energy-saving mode. After this step, step 1607 is performed.

Illustratively, the electronic device may take the PPG signal acquired in the substep 1806 as the PPG signal acquired by the PPG module in the power saving mode, for example, sig_4 as the PPG signal acquired in the power saving mode, and then the processor executes step 1607 to determine whether the acquired PPG signal meets the measurement condition.

The above sub-steps 1801-1806 are processes for determining a PPG signal collected by the PPG module while the electronic device is in a static state.

Step 1704: the electronic device determines a PPG signal collected by the PPG module when the electronic device is in a motion state.

For example, when it is determined that the scene of the electronic device is a motion scene, it may be measured in a manner corresponding to the motion scene. In this example, since the sensor is displaced, turned over, and swayed in a motion state, optical crosstalk is caused, multiple measurements may be performed in a motion scene to obtain different PPG signals. As shown in fig. 13, the center device is PD1, and the center device is located at the center position of the PCB board, where the center position is slightly affected by the displacement, overturning and shaking of the PPG module. The processor may control each LED to illuminate in turn and instruct the PD to receive the signal to obtain a corresponding PPG signal (steps 1613-1615).

Fig. 19 is a schematic flow chart of the PPG module collecting PPG signals under the motion state of the electronic device, and the following specifically describes the process of collecting the PPG signals by the PPG module with reference to fig. 19, which includes the following sub-steps:

sub-step 1901: the electronic device lights up the LED1 and controls the PD1 to receive the signal.

When the processor acquires the PPG signal corresponding to LED1 (denoted as sig_5), the processor can control the LED1 to go off.

Sub-step 1902: the electronic device lights up the LED2 and controls the PD1 to receive the signal.

When the PD1 receives the PPG signal corresponding to the LED2 (denoted as sig_6) and transmits it to the processor, the processor can control the LED2 to turn off.

Sub-step 1903: the electronic device lights up the LED3 and controls the PD1 to receive the signal.

When the PD1 receives the PPG signal corresponding to the LED2 (denoted as sig_7) and transmits the PPG signal to the processor, the processor may control the LED2 to turn off. By selecting the optical measurement paths g1, g2 and g3, optical crosstalk of the sensor due to displacement, flipping and shaking can be reduced by receiving signals through the PD1 located at the center position.

Sub-step 1904: the electronic device controls the LEDs 1, 2, and 3 to be connected in parallel and to light the LEDs 1, 2, and 3, and controls the PD1 to receive the signal.

Illustratively, in the motion state, the processor may also control all LEDs to be connected in parallel and illuminated, and receive a signal from PD 1. As shown in fig. 13, the processor controls LEDs 1, 2 and 3 to be connected in parallel and to light up the LEDs 1, 2 and 3, and controls PD1 to receive signals, and the processor obtains PPG signals, denoted as sig_8.

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

Sub-step 1905: the electronic device controls the LEDs 1, 2, and 3 to be connected in parallel and lights the LEDs 1, 2, and 3, and controls the PDs 1, 2, 3, and 4 to be connected in parallel and to receive signals. After this step, step 1906 is performed.

Illustratively, in the motion state, the processor may also control all LEDs to be connected in parallel and illuminated, and all PDs to be connected in parallel and receive signals. As shown in fig. 13, the processor controls the LEDs 1, 2, and 3 to be connected in parallel and light the LEDs 1, 2, and 3, and controls the PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals, and the processor obtains PPG signals corresponding to the measurement mode, which is denoted as sig_9.

Sub-step 1906: the electronic device obtains an optimal PPG signal from a plurality of PPG signals. After step 1906 is performed, step 1607 is performed.

Illustratively, the processor selects the optimal signal from the PPG signals obtained in steps 1901-1905. For example, PPG signals with optimal signal quality are obtained from sig_5 to sig_9. An optimal PPG signal will be obtained from the plurality of PPG signals.

The above sub-steps 1901-1906 are processes of determining a PPG signal collected by the PPG module when the electronic device is in motion.

Step 1705: the electronic device determines a PPG signal acquired by the PPG module when the electronic device is in a low-temperature and high-altitude state.

Illustratively, 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. As shown in fig. 13, optical measurement channels g9, g5, and g7 may be selected.

Fig. 20 is a schematic flow chart of PPG signals collected by the PPG module in a low temperature and high altitude state, and the process includes the following sub-steps:

substep 2001: the electronic device lights up the LED1 and controls the PD4 to receive the signal.

The processor lights up LED1 and controls PD4 to receive the signal, i.e. measured by g9, the processor obtains a PPG signal, noted sig_10.

Sub-step 2002: the electronic device lights up the LED2 and controls the PD2 to receive the signal.

The processor lights up the LED2 and controls the PD2 to receive the signal, i.e. to make a measurement via g5, the processor obtains a PPG signal, denoted sig_11.

Sub-step 2003: the electronic device lights up the LED3 and controls the PD3 to receive the signal.

The processor lights up the LED3 and controls the PD3 to receive the signal, i.e. to make a measurement via g7, the processor obtains a PPG signal, denoted sig_12.

Sub-step 2004: the electronic device controls the LEDs 1, 2, and 3 to be connected in parallel and lights the LEDs 1, 2, and 3, and controls the PDs 1, 2, 3, and 4 to be connected in parallel and to receive signals. After this step, sub-step 2005 is performed.

Illustratively, when it is determined that the electronic device is in a low temperature, high altitude environment, the processor controls LEDs 1, 2, and 3 to be connected in parallel and lights up the LEDs 1, 2, and 3, controls PD1, PD2, PD3, and PD4 to be connected in parallel, and receives a signal. By adding optical signal channels in order to obtain an optimal PPG signal.

The processor lights up LED1, LED2 and LED3 and controls PD1, PD2, PD3 and PD4 to receive the signals, the processor obtains PPG signals, noted sig_13.

Sub-step 2005: the electronic device obtains an optimal PPG signal from a plurality of PPG signals. After step 1906 is performed, step 1607 is performed.

Illustratively, the processor may obtain an optimal signal from the PPG signals obtained in sub-steps 2001-2004, i.e., select an optimal signal from sig_10-sig_13.

The above substeps 2001-2005 are processes for determining the PPG signal collected by the PPG module when the electronic device is in a low temperature, high altitude state.

In this example, the process of the electronic device acquiring the PPG signal acquired by the PPG module in each state is specifically described with reference to fig. 17 to 20, and step 1607 may be executed after the electronic device acquires the PPG signal acquired by the PPG module in each state.

Step 1607: the electronic device determines whether the signal quality satisfies a measurement condition. If it is determined that the measurement condition is satisfied, step 1608 is performed; if it is determined that the measurement condition is not satisfied, step 1609 is performed.

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 satisfied. 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 satisfied.

Step 1608: a measurement signal is acquired. This step is followed by step 1611.

Step 1609: the processor instructs the PPG module to perform full channel PPG signal inspection.

For example, the full channel PPG signal inspection may be to acquire PPG signals through the respective optical measurement channels, i.e. acquire all PPG signals of sub-steps 1802-1806, sub-steps 1901-1905, sub-steps 2001-2005, resulting in sig_1-sig_13.

Step 1610: the processor acquires an optimal signal from the PPG signals corresponding to the channels as a measurement signal. This step is followed by step 1611.

Illustratively, the processor selects the optimal PPG signal from sig_1 to sig_13 as the measurement signal.

Step 1611: the electronic device determines a measurement result from the measurement signal.

For example, the processor may calculate and obtain physiological parameters of the human body, such as heart rate, blood oxygen, etc., from the measurement signals.

In this example, by adopting the PPG signal measurement mode, through judging the scene, different use scenes start different measurement modes (that is, start different LEDs and different PDs), instead of adopting the same measurement mode, the measurement accuracy is improved, the problem that physiological parameters of a human body cannot be monitored in certain scenes, such as a use scene with low temperature and high altitude, needs a high perfusion rate, and the path length of an optical measurement path can be used for realizing the monitoring of the human body.

Any of the various embodiments of the application, as well as any of the same embodiments, may be freely combined. Any combination of the above is within the scope of the present application.

The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.

Claims

1. The utility model provides a PPG module which characterized in that includes:

the central device is a light emitter or a light receiver;

at least 3 reference devices, the 3 reference devices being arranged at the periphery of the central device and being positioned in different orientations, the reference devices being of the same type as the central device;

the reference devices are arranged in each reference area, and the reference areas are positions of included angle spaces formed by two adjacent reference devices in the 3 reference devices and the central device; if the central device is a light emitter, each reference area comprises at least one reference device which is a light receiver; if the central device is an optical receiver, each reference area comprises at least one reference device which is an optical transmitter.

2. The PPG module of claim 1, wherein if said central device is a light emitter, said reference device is a light emitter, and said reference region includes a light receiver therein; 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 comprises a light emitter; the distance between each light emitter and each adjacent light receiver is different.

3. The PPG module of claim 2, wherein each of said reference regions comprises N reference devices, N being an integer greater than 0;

the connecting lines between the N reference devices and the central device are in the same straight line;

the included angle formed between every two adjacent reference devices and the central device is divided into two different included angles by N connecting lines between the reference devices and the central device.

4. A PPG module according to claim 3, wherein the angle formed between each adjacent two reference devices and the central device is the same;

If the central device is a light emitter, the light emitting center of each of the at least 3 reference devices in different directions is in the same straight line with the light emitting center of the central device;

if the central device is a light receiver, the photosensitive center of each of the reference devices in the at least 3 different orientations is collinear with the photosensitive center of the central device.

5. The PPG module of claim 2, wherein each of said reference regions comprises N reference devices, N being an integer greater than 0;

the included angle formed between each two adjacent reference devices and the central device in the reference area is divided into two same included angles by connecting lines between the N reference devices and the central device;

if the central device is a light receiver, the light emitting center of the light emitter in the N reference devices is close to one of the reference devices in adjacent directions;

if the central device is a light emitter, the photosensitive center of the light receiver in the N reference devices is close to one of the reference devices in adjacent directions.

6. PPG module according to claim 2, wherein the i-th reference device located in different orientations next to the central device is used as i-th layer reference device of the PPG module, i being an integer greater than 0;

the distance between the central device and each of the reference devices in the ith layer of reference devices is equal or unequal;

a j-th reference device which is positioned in different directions and is close to the central device is used as a j-th layer reference device of the PPG module, j is an integer greater than 0, and the reference device comprises a light emitter or a light receiver;

the distance between the center device and each of the j-th layer reference devices is equal or unequal.

7. The PPG module of claim 6, wherein if said central device is an optical receiver, when an i-th layer reference device is provided, a (2 i-1) -th layer reference device and a 2 i-th layer reference device are provided correspondingly;

if the central device is a light emitter, when a 2 i-th layer reference device and a (2 i-1) -th layer reference device are arranged, an i-th layer reference device is correspondingly arranged;

wherein the distances between every two adjacent layers of reference devices are equal or unequal; the distances between every two adjacent reference devices are equal or unequal.

8. The PPG module of any one of claims 1 to 6, wherein if the central device is an optical receiver, the photosensitive or geometric center of the central device is located outside of a line between a plurality of reference devices in the same orientation;

if the central device is a light emitter, the light emitting center or geometric center of the central device is located outside the connecting line between the plurality of reference devices in the same direction.

9. The PPG module according to any one of claims 1 to 6, wherein the reference device within the reference region comprises an optical receiver and an optical transmitter;

the light receivers and the light emitters which are positioned in the same direction are sequentially arranged at intervals, and a reference device nearest to the central device is matched with the central device to form an optical measurement path.

10. PPG module according to any one of claims 1 to 6, wherein the reference devices within each reference region are located in at least 2 different orientations;

the connecting line between the reference device and the central device in each direction is in the same straight line;

the included angle formed between every two adjacent reference devices and the central device is equally divided by the connecting line between the reference devices and the central device, which are positioned in at least 2 different directions, or the included angle formed between every two adjacent reference devices and the central device is divided into at least 3 different included angles by the connecting line between the reference devices and the central device, which are positioned in at least 2 different directions.

11. The PPG module according to any one of claims 1 to 6, wherein said light emitters comprise red and infrared light dies;

and/or the number of the groups of groups,

the light emitter comprises a green light wafer and a blue light wafer.

12. The PPG module of any one of claims 1 to 6, wherein said light emitters comprise at least 2 different light emitting dies;

if the central device is a light emitting device, two light emitting crystal elements in the reference device are symmetrically arranged based on a central line of the reference device;

if the reference device comprises a light emitter, two light emitting crystal elements in the reference device are symmetrically arranged based on a central line of the reference device.

13. PPG module according to any one of claims 1 to 6, wherein the geometrical centre of each reference device is collinear with the geometrical centre of the central device.

14. The PPG module according to any one of claims 1 to 6, wherein if said central device is said light receiver, the photosensitive centers of each of said reference devices in the same orientation are in the same straight line;

if the central device is the light emitter, the light emitting center of each reference device in the same direction is in the same straight line.

15. The PPG module according to any one of claims 1 to 6, wherein said light receiver is a die structure or a package structure in which a light receiving die is packaged;

the light emitter adopts a packaging structure or a wafer structure.

16. PPG module according to any one of claims 1 to 6, wherein the number of orientations in which the reference device is located within each reference region is different.

17. The PPG module of claim 6, wherein the lines between the reference devices at the same layer number and the reference devices at the same layer number are in a square shape.

18. The PPG module of any one of claims 1 to 6, wherein the PPG module is disposed on an electronic device;

the geometric center of the central device is positioned at the geometric center of the plane where the PPG module is positioned;

or,

the luminous center of the central device is positioned at the geometric center of the plane where the PPG module is positioned;

or,

the photosensitive center of the central device is positioned at the geometric center of the plane where the PPG module is positioned.

19. The PPG module according to any one of claims 1 to 6, wherein if said PPG module is used for monitoring heart rate, the distance between the light receiver and the light emitter in said PPG module is between [1mm,10mm ];

If the PPG module is used for monitoring blood oxygen parameters, the distance between the light receiver and the light emitter in the PPG module is more than 10mm.

20. A method of measuring a PPG signal, applied to an electronic device comprising a processor and a PPG module as claimed in any one of claims 1 to 19 electrically connected to the processor, the method comprising:

acquiring a use scene of the electronic equipment;

determining a measurement mode matched with a use scene of the electronic equipment according to the use scene;

controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode;

and determining a measurement result of the PPG module according to the PPG signal output by the measurement mode.

21. The method of claim 20, wherein a central device of the PPG module is an optical receiver; if the measurement mode is a normal measurement mode, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, wherein the PPG signal comprises:

The following is done for each light emitter in turn: starting the light emitter to emit light signals, and controlling the light receivers adjacent to the light emitter to be connected in parallel; controlling the parallel light receivers to receive the PPG signals;

and determining a PPG signal output by the measurement mode according to each received PPG signal.

22. The method of claim 20, wherein a central device of the PPG module is an optical receiver; if the measurement mode is an energy-saving mode, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, wherein the PPG signal comprises:

controlling each light emitter to be connected in parallel, and lighting the light emitters connected in parallel;

controlling each optical receiver to be connected in parallel, and controlling the parallel optical receivers to receive the PPG signals;

and taking the received optical signal as a PPG signal output by the energy-saving mode.

23. The method of claim 20, wherein a central device of the PPG module is an optical receiver; if the measurement mode is a motion measurement mode, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, wherein the PPG signal comprises:

Sequentially illuminating each light emitter and controlling the central device to sequentially receive each PPG signal;

changing the connection mode between the light emitters into parallel connection, and controlling the central device to receive a PPG signal;

changing the connection mode of each light receiver into parallel connection;

each light emitter is lightened, and each light receiver connected in parallel is controlled to receive PPG signals;

and acquiring an optimal PPG signal as a PPG signal in the motion measurement mode according to each received PPG signal.

24. The method of claim 20, wherein a central device 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, controlling the operation of the light emitter according to the indication of the measurement mode, and controlling the connection mode of the light receiver indicated by the measurement mode to obtain a PPG signal output by the measurement mode, wherein the PPG signal comprises:

sequentially lighting each light emitter, and controlling a light receiver adjacent to the light emitter and farthest from the light emitting center of the light emitter to receive the PPG signal;

changing the connection mode between the transmitters into parallel connection and changing the connection mode of the light receivers into parallel connection;

Illuminating each of the optical transmitters and controlling each of the optical receivers connected in parallel to receive PPG signals;

and acquiring an optimal PPG signal from each received PPG signal as the PPG signal in a measurement mode corresponding to the low-temperature and high-altitude scene.

25. The method according to any one of claims 20 to 24, wherein determining the measurement result of the PPG module from the PPG signal output by the measurement mode comprises:

judging whether the PPG signal output in the measurement mode meets a preset measurement condition or not;

if yes, taking the output PPG signal as a measurement signal;

if the signals do not meet the requirements, PPG signals corresponding to the optical measurement channels in each measurement mode are obtained, and the optimal signals are obtained from the obtained PPG signals to serve as measurement signals;

and calculating the measurement result according to the measurement signal.

26. The method according to any one of claims 20-24, wherein prior to the acquiring the usage scenario of the electronic device, the method further comprises:

controlling each light receiver to receive ambient light;

determining a first pose of the electronic device from the ambient light;

acquiring a worn posture of the electronic equipment according to the first posture;

And when the worn posture does not meet the preset measurement posture, outputting prompt information to instruct a user to adjust the worn posture of the electronic equipment.

27. The method of claim 26, wherein prior to the determining the first pose of the electronic device from the ambient light, the method further comprises:

determining a second gesture of the electronic device according to the gesture sensor;

the determining a worn pose of the electronic device from the ambient light comprises:

and determining the worn posture of the electronic equipment according to the first posture and the second posture.

28. An electronic device, comprising:

one or more processors;

the PPG module of any one of claims 1-19 electrically connected to the processor;

a memory;

and one or more computer programs, wherein the one or more computer programs are stored on the memory, which when executed by the one or more processors, cause the electronic device to perform the method of measurement of PPG signals of any one of claims 20-27.