PPG module, PPG signal measuring method and electronic equipment

Abstract

The invention provides a PPG module, a PPG signal measuring method and electronic equipment, and relates to the technical field of electronics. The PPG module in the application comprises a central device which is a light emitter or a light receiver; the three reference devices are arranged on the periphery of the central device and located in different directions, and the type of the reference devices is the same as that of the central device; and the reference devices are arranged in each reference area, the reference area is the position where an included angle space formed by two adjacent reference devices in the three reference devices and the central device is located, and at least one reference device matched with the central device is arranged in the reference area. By adopting the PPG module provided by the invention, the number of optical measurement channels of each light emitter in the PPG module can be increased, the optical efficiency of the light emitters is improved, and the accuracy of human body parameter measurement of the PPG module is improved.

Description

[0001] This application is a divisional application based on the application with the application number 202210704094.5, the application date of June 21, 2022, and the invention title of "PPG Module, Measurement Method of PPG Signal and Electronic Device". The entire content of the original application is incorporated herein by reference. Technical Field

[0002] This application relates to the field of electronic technologies, and in particular, to a photoplethysmograph (PPG) module, a measurement method of a PPG signal, and an electronic device. Background Art

[0003] With the development of electronic technologies, intelligent terminals can monitor relevant physiological parameters of the human body through sensors with specific functions. For example, a PPG module is installed in an intelligent terminal (such as devices like bracelets, watches, armbands, etc.), and this PPG module can collect data such as the heart rate, blood oxygen, and blood pressure of the human body. The PPG module mainly includes a light emitter and a photodetector (PD), and the light emitter can be a light emitting diode (LED). The principle of the PPG module: The LED emits infrared light, red light, or green light to irradiate the human skin, and then the PD collects the signals reflected and scattered by the human skin, measures the change in the intensity of the reflected light caused by blood flow, thereby obtaining a pulse waveform, and extracting an effective signal from it to calculate human physiological parameters such as heart rate, blood pressure, and blood oxygen.

[0004] The layouts of the PD and the LED in the PPG module are diverse, and the layout of the PD and the LED affects the overall optical efficiency, power consumption, and size of the PPG module. It is necessary to reasonably plan the layout of the PD and the LED in the PPG module. Summary of the Invention

[0005] To solve the above technical problems, this application provides a PPG module, a measurement method of a PPG signal, and an electronic device, which can increase the optical measurement paths of each light emitter in the PPG module, improve the optical efficiency of the light emitter, and improve the accuracy of the PPG module in measuring human parameters.

[0006] In a first aspect, the present application provides a PPG module, a central device, where the central device is a light emitter or a light receiver; at least three reference devices, the three reference devices are arranged around the central device and located in different orientations, and the type of the reference device is the same as that of the central device; a reference device is arranged in each reference area, and the reference area is the position where the included angle space formed by two adjacent reference devices among the three reference devices and the central device is located; wherein, if the central device is a light emitter, each reference area includes at least one reference device that is a light receiver; if the central device is a light receiver, each reference area includes at least one reference device that is a light emitter.

[0007] In this way, the reference devices are arranged around the central device and located in different orientations. After the position of the central device is determined, the layout center of the current PPG module can be determined based on the position of the central device, and other PD devices or LED devices are arranged with the position of the central device as the reference, so that the device layout in the PPG module is more regular and the speed of arranging the reference devices is improved. The reference device is located in the reference area, and the reference area is determined based on the positions of the reference device and the central device. The area position of arranging the reference device is reduced by the reference device and the central device, and the speed of arranging the reference device is improved. At the same time, when the central device is a light emitter, each reference area includes at least one reference device that is a light receiver. When the central device is a light receiver, each reference area includes at least one reference device that is a light emitter, so that at least one reference device in the reference area is arranged at an interval from the reference device, increasing the number of optical measurement paths of the light emitter, thereby improving the optical efficiency of the light emitter and reducing power consumption. For example, when the central device is a light emitter, if there are three reference devices, there is at least one light receiver in the reference area. At this time, at least three optical measurement paths are formed between the central device and the light receivers in the three reference areas, and at least two optical measurement paths are formed between each reference device and the light receivers in the reference area; when the central device is a light receiver, if there are three reference devices, there is at least one light emitter in the reference area, and at least three optical measurement paths can be formed by the light emitters in each reference area.

[0008] According to the 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 distances between the central device and each adjacent light receiver are different, and the distances between the reference device and each adjacent light receiver are different; if the central device is a light receiver, the reference device is a light receiver, and the reference area includes a light emitter; the distances between each light emitter and the adjacent light receivers are different.

[0009] In this way, the distance between each light emitter and each adjacent light receiver is different, enabling the light emitters to form optical measurement paths of different lengths. Since the optical measurement paths are differentiated, the PPG module can obtain PPG signals from different vascular positions, different optical penetration depths, and different blood perfusions in the skin tissue when measuring signals, improving the accuracy of the PPG module in measuring human parameters.

[0010] According to the first aspect, each reference area includes N reference devices, where N is an integer greater than 0; the connection lines between the N reference devices and the central device are on the same straight line; the angle formed between each adjacent pair of reference devices and the central device is divided into two different angles by the connection lines between the N reference devices and the central device.

[0011] In this way, the connection lines between the N reference devices and the central device in the reference area are on the same straight line, enabling the reference devices to be regularly arranged in the reference area. At the same time, the angle formed between each adjacent pair of reference devices and the central device is divided into two different angles by the connection lines between the N reference devices and the central device, resulting in different distances between the reference devices and the reference devices in adjacent adjacent directions. Whether the reference device is a light emitter or a light receiver, the length of the optical measurement path formed between the reference device and the reference device is different, which can improve the measurement accuracy of the PPG module.

[0012] According to the first aspect, the angle formed between each adjacent pair of reference devices and the central device is the same; if the central device is a light emitter, the luminous centers of each reference device in at least 3 different directions are on the same straight line with the luminous center of the central device; if the central device is a light receiver, the photosensitive centers of each reference device in at least 3 different directions are on the same straight line with the photosensitive center of the central device. In this way, the angle formed between each adjacent pair of reference devices and the central device is the same. If the central device is a light emitter and the reference device is also a light emitter, the luminous center of each reference device is on the same straight line with the luminous center of the central device. If the central device is a light receiver and the reference device is also a light receiver, the photosensitive center of each reference device is on the same straight line with the photosensitive center of the central device, making the positions of the arranged reference devices symmetric with each other in the entire PPG module. The symmetric arrangement facilitates the flexible adjustment of the lengths of each optical measurement channel according to the measurement requirements.

[0013] According to the first aspect, each reference area includes N reference devices, where N is an integer greater than 0; the connection lines between the N reference devices and the central device are on the same straight line; the angle formed between each adjacent two reference devices and the central device within the reference area is divided into two equal angles by the connection lines between the N reference devices and the central device; if the central device is a photoreceiver, the light-emitting center of the light emitter among the N reference devices is close to one of the adjacent reference devices; if the central device is a light emitter, the photosensitive center of the photoreceiver among the N reference devices is close to one of the adjacent reference devices. In this way, the angle formed between each adjacent two reference devices and the central device within the reference area is divided into two equal angles by the connection lines between the N reference devices (such as when N is 1 or more than 2) and the central device, making the layout of the reference devices symmetrical, and the photosensitive center or light-emitting center in the reference devices is close to one of the adjacent reference devices, so that different lengths of optical measurement paths are formed between the reference device and the reference devices in two adjacent directions, improving the accuracy of PPG module measurement.

[0014] According to the first aspect, the i-th reference device close to the central device in different directions serves as the i-th layer reference device of the PPG module, where i is an integer greater than 0; the distance between the central device and each reference device in the i-th layer reference device is equal or unequal; the j-th reference device close to the central device in different directions serves as the j-th layer reference device of the PPG module, where j is an integer greater than 0, and the reference device includes a light emitter or a photoreceiver; the distance between the central device and each reference device in the j-th layer reference device is equal or unequal. In this way, multiple layers of reference devices and multiple layers of reference devices can be arranged, improving the flexibility of arranging the reference devices and reference devices. At the same time, when the distance between each layer of reference devices / each layer of reference devices is the same, the arranged reference devices are regular, and the regular arrangement method makes the layout beautiful and also facilitates the calculation of the length of each optical measurement path; when the distance between each layer of reference devices / each layer of reference devices is different, it is beneficial to improve the flexibility of arranging the devices.

[0015] According to the first aspect, if the central device is a photoreceiver, when the i-th layer reference device is set, the (2i - 1)-th layer reference device and the 2i-th layer reference device are correspondingly set; if the central device is a light emitter, when the 2i-th layer reference device and the (2i - 1)-th layer reference device are set, the i-th layer reference device is correspondingly set; among them, the distance between each adjacent two layers of reference devices is equal or unequal; the distance between each adjacent two layers of reference devices is equal or unequal. In this way, each layer of reference devices has corresponding layers of reference devices. For example, the first layer reference device corresponds to the first layer reference device and the second layer reference device. The number of layers of light emitters and the number of layers of photoreceivers are different, and setting multiple layers of light emitters improves the flexibility of the layout.

[0016] According to the first aspect, if the central device is a photoreceiver, the photosensitive center or geometric center of the central device is located outside the line connecting multiple 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 line connecting multiple reference devices in the same orientation. In this way, since the photosensitive center or geometric center of the central device is located outside the line connecting multiple reference devices in the same orientation or the light-emitting center or geometric center of the central device is located outside the line connecting multiple reference devices in the same orientation, the flexibility of arranging the reference devices is further improved.

[0017] According to the first aspect, the reference devices in the reference area include photoreceivers and light emitters; the photoreceivers and light emitters in the same orientation are arranged at intervals in sequence, and the reference device closest to the central device is matched with the central device to form an optical measurement path. In this way, the photoreceivers and light emitters in the same orientation are arranged at intervals in sequence, and the reference device closest to the central device is matched with the central device. For example, if the central device is a light emitter, the reference device closest to the central device is a photoreceiver; if the central device is a photoreceiver, the reference device closest to the central device is a light emitter. When the central device is a photoreceiver, the reference device closest to the central device can form at least 4 optical measurement paths with adjacent photoreceivers. When the central device is a light emitter, the central device can form at least 3 optical measurement paths, and the light emitters in the reference area can form at least 2 optical measurement paths. That is, this way of arranging at intervals can further increase the optical measurement paths of the light emitter.

[0018] According to the first aspect, the reference devices in each reference area are located in at least 2 different orientations; the lines connecting the reference devices in each orientation to the central device are on the same straight line; the angle formed between each adjacent two reference devices and the central device is bisected by the lines connecting the reference devices in at least 2 different orientations to the central device, or the angle formed between each adjacent two reference devices and the central device is divided into at least 3 different angles by the lines connecting the reference devices in at least 2 different orientations to the central device.

[0019] In this way, the reference devices in each reference area are located in at least 2 different orientations. For example, the light emitters and photoreceivers can be arranged at intervals in 2 orientations among the reference devices, or they can all be arranged as light emitters or photoreceivers, which increases the flexibility of arranging the reference devices.

[0020] According to the first aspect, the optical transmitter includes at least two different light-emitting chips; if the central device is an optical emission device, two light-emitting chips in the reference device are symmetrically arranged based on a central line of the reference device; if the reference device includes an optical transmitter, two light-emitting chips in the reference device are symmetrically arranged based on a central line of the reference device. In this way, the light-emitting chips are symmetrically arranged, which is beneficial to accurately detect human body parameters. For example, when detecting human blood oxygen, the optical transmitter includes a red light chip and an infrared light chip, and the two chips are symmetrically arranged.

[0021] According to the first aspect, the geometric centers of each reference device and the central device are on the same straight line. In this way, the geometric centers of the reference device and the central device are on the same straight line, making the layout of the deployed central device and reference device neat and facilitating the setting of other devices.

[0022] According to the first aspect, if the central device is an optical receiver, the photosensitive centers of each reference device in the same orientation are on the same straight line; if the central device is an optical transmitter, the light-emitting centers of each reference device in the same orientation are on the same straight line. In this way, the photosensitive centers of each reference device in the same orientation are on the same straight line or the light-emitting centers of each reference device in the same orientation are on the same straight line, making the layout of the reference device neat. At the same time, it is easy to calculate the distance from the optical signal emitted by the optical transmitter to the optical receiver.

[0023] According to the first aspect, the optical receiver is a chip structure or a package structure encapsulating an optical receiving chip; the optical transmitter adopts a package structure or a chip structure. In this way, the optical receiver or the optical transmitter can adopt a package structure, which makes the deployment convenient. Since the chip structure is small, it can be flexibly arranged in an area with effective space.

[0024] According to the first aspect, the number of orientations of the reference devices in each reference area is different. In this way, due to the different number of orientations of the reference devices in each reference area, the flexibility of deploying the reference devices is further improved. For example, two reference devices with different orientations can be arranged in one reference area, one reference device with one orientation can be arranged in another reference area, and three reference devices with different orientations can be arranged in the third reference area.

[0025] According to the first aspect, the connection lines between the reference devices on the same layer and the reference devices on the same layer enclose a quadrilateral. In this way, the quadrilateral structure further increases the optical measurement paths of the optical transmitter. For example, when the central device is an optical receiver and the reference devices are located at at least four different orientations of the central device, each optical transmitter can form at least three optical measurement paths; when the central device is an optical transmitter and the reference devices are located at at least four different orientations of the central device, the central device forms at least four optical measurement paths.

[0026] According to the first aspect, the PPG module is deployed in the electronic device; the geometric center of the central device is located at the geometric center of the plane where the PPG module is located; or, the light-emitting center of the central device is located at the geometric center of the plane where the PPG module is located; or, the light-sensing center of the central device is located at the geometric center of the plane where the PPG module is located. In this way, the position of the central device is related to the shape of the electronic device and is set at the geometric center of the plane where the PPG module is located, which facilitates the PPG module to measure human parameters. For example, if the central device is deployed at the edge of the plane where the PPG module is located, it will increase the ambient light received by the optical receiver, resulting in greater sensitivity to ambient light and reducing the measurement accuracy.

[0027] According to the first aspect, if the PPG module is used to monitor the heart rate, the distance between the optical receiver and the optical transmitter in the PPG module is between [1 mm, 10 mm]; if the PPG module is used to monitor blood oxygen parameters, the distance between the optical receiver and the optical transmitter in the PPG module is greater than 10 mm. In this way, in different measurement scenarios, the distance range between the optical receiver and the optical transmitter is different, and the distance between each optical transmitter and the optical receiver can be set according to different measurement ranges.

[0028] In the second aspect, the present application provides a method for measuring a PPG signal, which is applied to an electronic device. The electronic device includes a processor and a PPG module as described in the first aspect and any implementation manner of the first aspect that is electrically connected to the processor. The method includes: obtaining the usage scenario of the electronic device; determining a measurement mode matching the usage scenario according to the usage scenario of the electronic device; controlling the operation of the optical transmitter according to the indication of the measurement mode, and controlling the connection mode of the optical receiver indicated by the measurement mode to obtain the PPG signal output by the measurement mode; and determining the measurement result of the PPG module according to the PPG signal output by the measurement mode.

[0029] In this way, by adopting this PPG signal measurement method, through the judgment of the scenario, different usage scenarios start different measurement modes (that is, start different LEDs and different PDs), rather than all adopting the same measurement method, which improves the measurement accuracy and avoids the problem of being unable to monitor human physiological parameters in some scenarios, such as usage scenarios at low temperature and high altitude, where a high perfusion rate is required and a long path of the optical measurement path is needed to achieve the monitoring of the human body.

[0030] According to the second aspect, the central device of the PPG module is a photoreceiver; if the measurement mode is the normal measurement mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the photoreceiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: performing the following processing for each optical transmitter in sequence: starting the optical transmitter to emit an optical signal, controlling the photoreceivers adjacent to the optical transmitter to be connected in parallel; controlling the parallel-connected photoreceivers to receive the PPG signal; and determining the PPG signal output by the measurement mode according to each received PPG signal.

[0031] In this way, in the normal measurement mode, due to the different positions of each optical transmitter, different PPG signals can be obtained by acquiring the signals emitted by the optical transmitters at different positions. The PPG signal that conforms to this mode can be selected from multiple PPG signals. Since each optical transmitter can form at least three optical measurement paths, the measurement accuracy can be improved in this mode.

[0032] According to the second aspect, the central device of the PPG module is a photoreceiver; if the measurement mode is the energy-saving mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the photoreceiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: controlling each optical transmitter to be connected in parallel and turning on the parallel-connected optical transmitters; controlling each photoreceiver to be connected in parallel and controlling the parallel-connected photoreceivers to receive the PPG signal; and using the received optical signal as the PPG signal output by the energy-saving mode.

[0033] In this way, since each optical transmitter is connected in parallel, the power of the optical transmitter can be reduced. Similarly, since each photoreceiver is connected in parallel, the power consumption of the photoreceiver is also reduced, thereby realizing energy-saving measurement.

[0034] According to a second aspect, the central device of the PPG module is a photoreceiver; if the measurement mode is a motion measurement mode, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the photoreceiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: sequentially lighting each optical transmitter, and controlling the central device to sequentially receive each PPG signal; changing the connection mode between the optical transmitters to parallel, and controlling the central device to receive the PPG signal; changing the connection mode of each photoreceiver to parallel; lighting each optical transmitter, controlling each parallel-connected photoreceiver to receive the PPG signal; obtaining the optimal PPG signal from each received PPG signal as the PPG signal in the motion measurement mode. In this way, due to displacement, flipping, and shaking of the sensor during motion, resulting in optical crosstalk, therefore, in a motion scenario, multiple measurements can be performed to obtain different PPG signals. At the same time, the central device is located at the center position of the plane where the PPG module is located, and the center position is less affected by the displacement, flipping, and shaking of the PPG module, thereby improving the accuracy of measurement in a motion state.

[0035] According to a second aspect, the central device of the PPG module is a photoreceiver; if the measurement mode is the measurement mode corresponding to a low-temperature and high-altitude scenario, the operation of the optical transmitter is controlled according to the indication of the measurement mode, and the connection mode of the photoreceiver indicated by the measurement mode is controlled to obtain the PPG signal output by the measurement mode, including: sequentially lighting each optical transmitter, and controlling the photoreceiver adjacent to the optical transmitter and farthest from the light-emitting center of the optical transmitter to receive the PPG signal; changing the connection mode between the transmitters to parallel and changing the connection mode of each photoreceiver to parallel; lighting each optical transmitter, and controlling each parallel-connected photoreceiver to receive the PPG signal; obtaining the optimal PPG signal from each received PPG signal as the PPG signal in the measurement mode corresponding to the low-temperature and high-altitude scenario. In this way, a long optical measurement channel has a high pulse signal perfusion rate, and a short optical measurement signal channel has a high signal energy. When it is determined that the electronic device is in a low-temperature and high-altitude environment, a high perfusion rate is required, and an optical measurement path with a long path is obtained to have a high perfusion rate, thereby improving the accuracy of the PPG module measurement.

[0036] According to a second aspect, based on the PPG signal output by the measurement mode, the measurement result of the PPG module is determined, including: determining whether the PPG signal output in the measurement mode meets a preset measurement condition; if it is determined that it meets, using the output PPG signal as the measurement signal; if it is determined that it does not meet, obtaining the PPG signals corresponding to each optical measurement channel in each measurement mode, and obtaining the optimal signal from the obtained PPG signals as the measurement signal; calculating the measurement result according to the measurement signal. In this way, the problem of inaccurate measurement results caused by using a PPG signal whose signal quality does not meet the conditions can be avoided.

[0037] According to a second aspect, before obtaining the usage scenario of the electronic device, the method further includes: controlling each light receiver to receive ambient light; determining a first posture of the electronic device according to the ambient light; obtaining a worn posture of the electronic device according to the first posture; when the worn posture does not meet a preset measurement posture, outputting a prompt message to instruct the user to adjust the worn posture of the electronic device. In this way, since the worn posture of the electronic device will affect the measurement of the PPG module (such as causing an increase in ambient light and reducing the accuracy of the PPG module measurement), the user can be prompted in a timely manner to adjust the worn posture of the electronic device, which can improve the accuracy of the PPG module in measuring human parameters.

[0038] According to a second aspect, before determining the first posture of the electronic device according to the ambient light, the method further includes: determining a second posture of the electronic device according to a posture sensor; determining the worn posture of the electronic device according to the ambient light, including: determining the worn posture of the electronic device according to the first posture and the second posture. In this way, the second posture of the electronic device can be determined by the sensor, and the worn posture of the electronic device can be jointly determined by the first posture and the second posture, which can improve the accuracy of the determined worn posture of the electronic device.

[0039] In a third aspect, the present application provides an electronic device, including: one or more processors; a memory; and one or more computer programs, where one or more computer programs are stored on the memory, and when the computer programs are executed by the one or more processors, the electronic device is caused to execute the PPG signal measurement method according to the second aspect and any implementation manner of the second aspect. The technical effects corresponding to the implementation manners of the third aspect can be referred to the technical effects corresponding to any implementation manner of the first aspect and the second aspect above, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is a schematic layout diagram of an exemplary PPG module;

[0042] Figure 2 is a schematic layout diagram of an exemplary PPG module including 3 LEDs;

[0043] Figure 3 is a schematic process diagram of an exemplary layout of a PPG module;

[0044] Figure 4 It is a schematic layout diagram of another PPG module shown by way of example;

[0045] Figure 5 It is a schematic diagram showing an example where the optical transmitter includes multiple die;

[0046] Figure 6 It is a schematic diagram of a PPG module with two - level LEDs arranged shown by way of example;

[0047] Figure 7 It is a schematic diagram showing an example where both the number of layers of the optical receiver and the number of layers of the optical transmitter are multiple;

[0048] Figure 8 It is a schematic layout diagram of a PPG module shown by way of example;

[0049] Figure 9 It is a schematic diagram showing an example where the angle formed between every two adjacent reference devices and the central device is divided into two different angles by the connection line between the reference device and the central device;

[0050] Figure 10 It is a schematic diagram showing an example where the reference area includes reference devices located in multiple orientations;

[0051] Figure 11 It is a schematic diagram of a PPG module with the central device being an optical transmitter shown by way of example;

[0052] Figure 12 It is a schematic diagram showing an example where the connection line between the reference device and the reference device located on the same layer encloses a quadrilateral;

[0053] Figure 13 It is a schematic diagram of each optical measurement path of a PPG module shown by way of example;

[0054] Figure 14 It is a schematic diagram of each optical measurement path of a PPG module shown by way of example;

[0055] Figure 15a It is a schematic diagram of the worn posture of a smartwatch shown by way of example;

[0056] Figure 15b It is a schematic diagram of the scene after the user adjusts the worn posture of the smartwatch shown by way of example;

[0057] Figure 16 It is a schematic diagram showing the process of the smartwatch in FIG. 15 monitoring human physiological parameters by way of example;

[0058] Figure 17 It is a schematic diagram showing the specific process of an exemplary electronic device obtaining the PPG signal output by the PPG module in the current usage scenario of the electronic device;

[0059] Figure 18 It is a schematic diagram showing the process of the PPG module collecting the PPG signal when the electronic device is in a static state;

[0060] Figure 19 It is a schematic diagram showing the process of the PPG module collecting the PPG signal when the electronic device is in a moving state;

[0061] Figure 20 It is a schematic diagram showing the process of the PPG module collecting the PPG signal when the electronic device is in a low - temperature and high - altitude state. Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0063] The term "and / or" in this article is only used to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0064] The terms "first" and "second" in the description and claims of the embodiments of the present application are used to distinguish different objects, rather than to describe the specific order of the objects. For example, the first target object and the second target object are used to distinguish different target objects, rather than to describe the specific order of the target objects.

[0065] In the embodiments of the present application, words such as "exemplary" or "for example" are used to give examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way.

[0066] In the description of the embodiments of the present application, unless otherwise stated, the meaning of "a plurality of" refers to two or more. For example, a plurality of processing units refers to two or more processing units; a plurality of systems refers to two or more systems.

[0067] In the embodiment of the present application, the PPG module includes a light emitter and a light receiver (such as a PD). The light emitter LED can emit green light, and the light receiver is used to receive the light emitted by the LED. Figure 1 A PPG module is shown. Figure 1 As shown, the hollow circles are LEDs, and the LEDs and PDs are arranged on a PCB board. In this example, the PCB board is circular as Figure 1 shown. The PD is arranged at the center of the circular PCB board, and 6 LEDs are evenly arranged around the PD. With the PPG module arranged as Figure 1 shown, only one PD receives the light from the LEDs, that is, there are only 6 optical measurement channels in this layout, resulting in low light efficiency and high power consumption of the PPG module.

[0068] The embodiment of the present application provides a layout method of PDs and LEDs in a PPG module, which enables the PPG module to effectively improve optical efficiency and reduce power consumption. At the same time, with this layout method, the measurement method can be flexibly adjusted according to measurement requirements, enhancing the applicability of the PPG module.

[0069] The PPG module in the present application can be arranged in an electronic device, which can be a wearable device, such as a smart watch, a bracelet, an armband, etc. Of course, the electronic device can also be other devices, such as a human physiological parameter measurement device, etc. The embodiment of the present application does not limit the specific form of the electronic device. For the convenience of description, the following takes the electronic device as a smart watch as an example for description.

[0070] The smart watch can include a main board, a display screen, a battery, etc. Among them, a processor, an internal memory, a charging circuit, etc. can be integrated on the main board. Of course, the smart watch can also include other components, and other circuit structures can also be integrated on the main board. The embodiment of the present application does not limit this. The charging circuit of the mobile phone includes a power management circuit and a charging management circuit. The power management circuit is connected to the lithium battery, the charging management circuit, and the processor. The internal memory in the smart watch can be used to store computer-executable program codes, and the executable program codes can include instructions. The processor executes various functional applications and data processing of the mobile phone by running the instructions stored in the internal memory. The above-mentioned processor, internal memory, charging circuit, etc. integrated on the main board all include one or more chips.

[0071] In this application, the PPG module includes a light emitter and a light receiver. The light emitter can be an LED, and the light receiver can be used to receive the light emitted by the light emitter. The light receiver can be a PD, a photoresistor, a phototransistor, a photoelectric converter, etc. In this application, the light receiver takes the PD as an example. Among them, the light emitter can adopt a packaging structure or not. The light receiver can also adopt a packaging structure or not.

[0072] In one embodiment, the PPG module includes: a plurality of LEDs and a plurality of PDs, and the plurality can be 3 or more. For example, the PPG module includes 4 PDs and 3 LEDs; or, the PPG module includes 3 PDs and 4 LEDs. Below, in this application, the layout situation where the PPG module includes at least 3 LEDs Figure 2 shows a layout schematic diagram of a PPG module including 3 LEDs in this application.

[0073] As Figure 2 shown, this PPG module includes 3 LEDs and 4 PDs. Both the LEDs and the PDs are arranged on the PCB board 20. The shape of the PCB board 20 can be set according to the shape of the electronic device. In this example, the electronic device is circular, and the PCB board 20 can also be set to be circular. Optionally, the PCB board 20 can also be other shapes, such as square, diamond, etc., which will not be listed one by one here.

[0074] 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 can be provided at the center position of the PCB board 20 (i.e., the plane where the PPG module is located), and 3 PDs are evenly distributed around the PD201, namely PD202, PD203, and PD204. The PD202, PD203, and PD204 are arranged on the periphery of the PD201 and are located in different orientations. LEDs are arranged between the surrounding PDs, that is, an LED301 is arranged between PD202 and PD204, an LED302 is arranged between PD202 and PD203, and an LED303 is arranged between PD204 and PD203.

[0075] It should be noted that in this example, the LEDs and the PDs can adopt a packaging structure, such as SIP packaging (System In a Package).

[0076] In this example, three LEDs (i.e., LED 301, LED 302, and LED 303) and three PDs (i.e., PD202, PD203, and PD204) are arranged around PD201, and the three PDs around PD201 are spaced apart from the three LEDs around PD201. This layout enables each LED to be adjacent to three PDs, and each light emitter can generate at least three optical measurement paths, improving the optical efficiency of the light emitter.

[0077] Figure 3 Schematically shown for illustrative purposes Figure 2 of the layout process of the PPG module in. The following is combined with Figure 3 to specifically illustrate the Figure 2 layout method.

[0078] Specifically, a position can be selected on the PCB to set the central device according to the shape of the electronic device. Optionally, the central device can also be deployed at any position on the PCB board. In this example, the case where the central device is deployed on the PCB corresponding to the center of the dial is taken as an example. For example, in the case where the dial of the smart watch is circular, the shape of the PCB board is the same as that of the dial, and the PCB board is disposed opposite to the dial, then it can be determined that the central device is set on the PCB corresponding to the center of the circular dial. As Figure 3 shown in 3a, the shape of the dial is the same as that of the PCB board, and the center of the dial coincides with the center of the PC board. The central device is set at the center of the circular PCB board 20 (when the PCB board is circular, the center is the geometric center of the PCB board).

[0079] Optionally, the central device can be a PD or an LED. The central device can be one or multiple. In this example, taking the PD as an example for the central device, the photosensitive center of the PD201 can be set at the geometric center position of the PCB board 20. The geometric center of the PD201 can also be set at the geometric center position of the PCB board 20. Optionally, in this example, the case where the photosensitive center of the PD201 coincides with the geometric center of the PCB board 20 is taken as an example. By setting the central device, the layout center of the current PPG module can be determined, and other PD devices or LED devices are arranged based on the position of the central device, making the device layout in the PPG module more regular.

[0080] In this example, the geometric center or photosensitive center of the central device (i.e., PD201) is used as the origin to construct multiple virtual reference axes. The positions where the reference axes are located can be used to deploy reference devices, and the type of the reference device is the same as that of the central device. The positions where the reference axes are located are used to deploy reference devices, that is, the reference devices are arranged based on the reference axes, so that the areas where the reference devices are deployed can be quickly determined through the reference axes, and the deployment speed of the reference devices is accelerated.

[0081] Multiple reference axes can divide the PCB board 20 into multiple parts. The multiple virtual reference axes can be 3 or more. In this example, 3 reference axes are taken as an example for illustration. As Figure 3 shown in 3a, 3 reference axes are constructed so that the 3 reference axes evenly divide the PCB board 20, such as the reference axis 401, the reference axis 402, and the reference axis 403 shown in 3a. The 3 reference axes converge at the photosensitive center of the PD201 and evenly divide the PCB board 20.

[0082] Optionally, the angle between every two reference axes can be equal or unequal, that is, the angle formed between every two adjacent reference devices and the central device can be equal or unequal. For example, the angle between the reference axis 401 and the reference axis 403 in 3a is not equal to the angle between the reference axis 401 and the reference axis 402.

[0083] A virtual reference axis is constructed between two adjacent reference axes (i.e., the position where the angle space formed by two adjacent reference devices and the central device is located). The reference axis is used to assist in deploying the reference device, and the type of the reference device can be the same as that of the central device or different from that of the central device. For example, the reference device can be deployed along the extension direction of the reference axis or at an adjacent position of the reference axis. Through the position of the reference axis, the area for deploying the reference device can be reduced, and the time for determining the area for deploying the reference device can be reduced.

[0084] The convergence point of each reference axis can be the same as the convergence point of each reference axis, or the convergence point of each reference axis can be different from the convergence point of each reference axis. In this example, the case where the convergence point of each reference axis is the same as the convergence point of each reference axis is taken as an example, that is, each reference axis converges at the geometric center or photosensitive center of the central device PD201, as Figure 3As shown in 3b, a reference axis 501 is constructed between the reference axis 401 and the reference axis 403. A reference axis 502 is constructed between the reference axis 401 and the reference axis 402, and a reference axis 503 is constructed between the reference axis 402 and the reference axis 403. An 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. Optionally, the included angle θ1, the included angle θ2, and the included angle θ3 may be the same or different, that is, the reference axis and the adjacent reference axis may form an included angle of any angle. In this example, the included angle θ1, the included angle θ2, and the included angle θ3 are taken as the same for example.

[0085] As Figure 3 As shown in 3b, a PD device is arranged respectively along the extending directions of the reference axis 401, the reference axis 402, and the reference axis 403, and the arranged PD devices are within the area of the PCB corresponding to the circular dial. Optionally, the reference axis may pass through the photosensitive center or the geometric center of the PD device arranged in the extending direction of the reference axis and converge at the geometric center or the photosensitive center of the central device 201; the reference axis coincides with the center line of the PD device. As shown in 3c, PD202 is arranged at the position where the reference axis 401 is located, so that the reference axis 401 can pass through the photosensitive center of the PD202 and the reference axis 401 coincides with a center line of the PD202. Similarly, PD204 can be arranged at the position where the reference axis 402 is located, 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 PD203; PD203 is arranged at the position where the reference axis 403 is located, and the photosensitive center of the PD203 is located on the reference axis 403, and the reference axis 403 coincides with the photosensitive center of the PD203. In this embodiment, the device types on each reference axis are the same, and the devices on the reference axis and the central device have the same type. In this example, the devices on the reference axis do not include the central device. Optionally, the number of devices on each reference axis is greater than or equal to 1.

[0086] During the layout process, the central device can be referred to as the zero-level device (or the zero-layer device). The PD202, PD203, and PD204 serve as the first-level PD devices (or the first-layer PD devices, the first-layer reference devices) of the PPG module. The distance between each PD in the first-level PD devices and the central device can be the same or different. The distance between each PD device in the first-level PD devices and the central device can be set based on measurement requirements and is not limited in this example. Optionally, the distance between each PD in the first-level PD devices and the central device can be the distance between the photosensitive center of each PD in the first-level PD devices and the photosensitive center of the central device, or the distance between the geometric center of each PD in the first-level PD devices and the geometric center of the central device. In this example, the distance between each PD in the first-level PD devices and the central device is taken as the distance between the photosensitive center of each PD and the photosensitive center of the central device. As shown in 3d, the first-level PD devices include PD202, PD203, and PD204, and the photosensitive center of the central device PD201 is Figure 3 the black dot in 3d. Except for the zero-layer device, the distances from the devices on other same levels to the central device can be the same or vary according to different functional requirements.

[0087] For example, Figure 3 as shown in 3d, the distance between the photosensitive center of PD203 and the photosensitive center of PD201 is shown as d1 in 3d. The distance between the photosensitive center of PD202 and the photosensitive center of PD201 is shown as d2 in 3d. The distance between the photosensitive center of PD204 and the photosensitive center of PD201 is shown as d3 in 3d. The d1, d2, and d3 can be equal or not equal.

[0088] After determining the first-level PD devices, the light emitters in the PPG module can be arranged based on the reference axis. In this example, the light emitter can be an LED, and the LED can include a single light-emitting chip, which can emit red light, green light, blue light, etc. In this example, as shown in Figure 3 3e, the LED is arranged along the extending direction of the reference axis. The geometric center of the arranged LED is located on the reference axis. For example, the geometric center of LED301 is located on the reference axis 502, the geometric center of LED302 is located on the reference axis 501, and the geometric center of LED303 is located on the reference axis 503. Optionally, the photosensitive center of the LED arranged along the extending direction of the reference axis can be located on the reference axis, Figure 3 which is not shown in the figure. Optionally, the devices arranged along the extending direction of the reference axis can be arranged according to measurement requirements. For example, the devices arranged along the extending direction of the reference axis can be a combination of multiple light-emitting chips.

[0089] In the direction of the reference axis and the reference axis, the device closest to the central device is the first-level device (or the first-layer device), and so on. From the inside out, they are the second-level device and the third-level device, which can increase step by step. The LED301, LED302, and LED303 are the first-level LED devices (or the first-layer LED devices, the first-layer reference devices) of the PPG module. The distance from each LED in the first-level LED devices to the central device can be the same or different. Optionally, the distance between each LED in the first level and the central device can be the distance between the photosensitive center of each LED in the first level and the photosensitive center of the central device, or the distance between the geometric center of each LED in the first level and the geometric center of the central device. In this example, the distance between each LED in the first layer and the central device is taken as the distance between the geometric center of each LED in the first layer and the geometric center of the central device. As shown in 3f, the first-level LED devices include LED301, LED302, and LED303. The geometric center of the central device PD201 is the black dot in 3f. The distance between the geometric center of the LED302 and the geometric center of the PD201 is shown as d4 in 3f. The distance between the geometric center of the LED303 and the geometric center of the PD201 is shown as d5 in 3f. The distance between the geometric center of the LED301 and the geometric center of the PD201 is shown as d6 in 3f. The d4, d5, and d6 can be equal or not equal. Optionally, d1, d2, d3, d4, d5, and d6 can be equal or not equal.

[0090] In this embodiment, it is specifically illustrated as Figure 2 shown in the layout process of the PD and LED in the PPG module. In this embodiment, first, a reference axis (as shown in 3a) is determined based on the central device. There is at least one reference axis between adjacent reference axes. Along the reference axis or the extension direction of the reference axis, the PD and LED devices in the PPG module are arranged from the inside out. This layout method is fast.

[0091] In this example, the angles between adjacent reference axes are the same. The geometric center / photosensitive center of the PD is located on the reference axis, so that the positions of the devices arranged based on the reference axis are symmetric with each other in the entire PPG module. The symmetric setting facilitates flexible adjustment of the lengths of each optical measurement channel according to the measurement requirements. At the same time, after the reference axis is determined, the layout framework of the PPG module is determined. Since the reference axis is set based on the reference axis, that is, the area where the remaining devices are arranged is further determined in the layout framework, the range of the layout of the remaining devices is reduced, and the layout speed is accelerated. In this example, as Figure 2 , Figure 3For 3e, the central device is a PD. The PDs and LEDs surrounding the central device are spaced apart such that each LED in the PPG module can form an optical measurement path with the surrounding PDs. That is, each LED has 3 optical measurement channels. With the same number of PDs, the optical efficiency is improved and the power consumption is reduced. The devices located on the reference axis can be symmetrically arranged based on the reference axis. The layout method of symmetrically arranged devices is simple and more in line with the appearance requirements of users. Additionally, in the traditional layout of the PPG module, each LED can only form an optical measurement path with a specific PD combination. Due to the relatively large spacing of the remaining PDs, the light energy is absorbed, resulting in the problem of ineffective measurement. However, with the layout method in this application, when the angles between the reference axes are the same and the angles formed by each adjacent reference axis and the reference axis are the same, optical paths of the same length or optical measurement channels with the same signal energy level can be formed, thereby avoiding the problem that the optical energy of the LED light source is completely absorbed and cannot be effectively received by the PD device due to the too long optical path.

[0092] In some embodiments, the LED package structure may include multiple light-emitting chips. For example, the LED on the reference axis may further include 2 light-emitting chips. Optionally, the colors of the multiple light-emitting chips in the LED package may be different. For example, one light-emitting chip is a red light chip and the other is an infrared light chip.

[0093] Figure 4 An exemplary layout schematic diagram of another PPG module is shown. The LED package in the PPG module includes multiple light-emitting chips.

[0094] As Figure 4 shown, 3 reference axes and 3 reference axes can be constructed in the PPG module. The reference axes include: reference axis 401, reference axis 402, and reference axis 403. The angle between adjacent reference axes can be 120 degrees. The reference axes include: reference axis 501, reference axis 502, and reference axis 503. The angle between each reference axis and the adjacent reference axis can be 60 degrees. Among them, the construction process of the reference axis and the reference axis is similar to that in Figure 3 and can be referred to Figure 3Regarding the relevant descriptions in 3a and 3b, they will not be elaborated here. PD is arranged along the direction extending along the reference axis, and the geometric center or photosensitive center of the arranged PD is located on the reference axis. The PD2, PD3, and PD4 form the peripheral distribution devices of the PPG module. LED is arranged along the direction extending along the reference axis. The LED may include two light-emitting chips. For example, LED305 includes light-emitting chip 3051 and light-emitting chip 3052. The light emitted by the light-emitting chip 3051 and the light-emitting chip 3052 may be different. For example, the light-emitting chip 3051 may be an infrared light chip or a red light chip, or the light-emitting chip 3052 may be a red light chip or an infrared light chip. In this example, the light-emitting chip 3051 is taken as a red light chip, and the light-emitting chip 3052 is taken as an infrared light chip. The red light chip, the infrared light chip and the PD are used in cooperation, so that the PPG module can monitor the blood oxygen of the human body.

[0095] As Figure 4 shown, the positions of the light-emitting chip 3051 and the light-emitting chip 3052 are symmetrically arranged with respect to the reference axis 501 as the axis of symmetry. Similarly, the two light-emitting chips in the LED304 are symmetrically arranged with respect to the reference axis 502 as the axis of symmetry; the two light-emitting chips in the LED306 are symmetrically arranged with respect to the reference axis 503 as the axis of symmetry.

[0096] Optionally, the positions of the light-emitting chip 3051 and the light-emitting chip 3052 may not be symmetrically arranged with respect to the reference axis 501 as the axis of symmetry.

[0097] In this example, the angles between adjacent reference axes are the same, and the angles between the reference axis and adjacent reference axes are also the same. The light-emitting chips in the LED include two light-emitting chips, such as a red light chip and an infrared light chip. When the two chips in the LED are symmetrically arranged with respect to the reference axis, the emission settings of the two light sources in the LED are symmetric, and a light measurement path with the same path length as the adjacent PD device can be formed.

[0098] In some embodiments, the LED may further include three chips, such as a green light chip, a red light chip, and an infrared light chip. As Figure 5As shown in 5a, the PPG module includes a reference axis 401, a reference axis 402, a reference axis 403, a reference axis 501, a reference axis 502, and a reference axis 503. PDs (such as PD202, PD203, and PD204) are arranged along the extending direction of the reference axis, and the geometric center or photosensitive center of the arranged PDs is located on the reference axis. LEDs (such as LED307, LED308, and LED309) are arranged along the extending direction of the reference axis. In this example, LED307, LED308, and LED309 are of the same type and each includes three types of light-emitting chips. In this example, LED308 is taken as an example for illustration. For example, the light-emitting chip 3081 is a red light chip, the light-emitting chip 3082 is an infrared light chip, and the light-emitting chip 3082 is a green light chip. In this example, the light-emitting chip 3082 and the light-emitting chip 3081 in LED308 are symmetric with each other with the reference axis 501 as the axis of symmetry, and the photosensitive center of the light-emitting chip 3083 is located on the reference axis 501. LED307 and LED309 are similar to this LED308 and will not be elaborated here.

[0099] Optionally, in some embodiments, SIP packaging can also be adopted to package the current layout of the PD device and the LED device to form an integrated module.

[0100] In this example, the LED includes more than 3 types of light-emitting chips. For example, with 3 types of light-emitting chips, the green chip can monitor the human heart rate, and the red light chip and the infrared light chip can be used in combination to monitor the human blood oxygen. Through multiple chips, the PPG module can monitor multiple human physiological parameters, enriching the monitoring content and usage scenarios of the PPG module.

[0101] In some embodiments, the LED and the PD can also be chip structures, that is, in a non-packaged mode. As Figure 5 shown in 5b, the PPG module includes a reference axis 401, a reference axis 402, a reference axis 403, a reference axis 501, a reference axis 502, and a reference axis 503. PDs (such as PD2021, PD2031, and PD2041) are arranged along the extending direction of the reference axis, and the geometric center or photosensitive center of the arranged PDs is located on the reference axis. Three types of chips are arranged along the extending direction of the reference axis, and the three types of chips are independently arranged on the PCB board 20.

[0102] Exemplarily, the light-emitting chip 3081 can be a red light chip, the light-emitting chip 3082 can be an infrared light chip, and the light-emitting chip 3082 can be a green light chip. In this example, similar to 5a, the light-emitting chip 3082 and the light-emitting chip 3081 are symmetric with respect to the reference axis 501. The photosensitive center of the light-emitting chip 3083 is located on the reference axis 501. Similarly, the light-emitting chip 3072 and the light-emitting chip 3071 are symmetric with respect to the reference axis 502. The photosensitive center of the light-emitting chip 3073 is located on the reference axis 502. The light-emitting chip 3092 and the light-emitting chip 3091 are symmetric with respect to the reference axis 503. The photosensitive center of the light-emitting chip 3093 is located on the reference axis 503.

[0103] In this example, both the PD and the LED adopt a chip structure. Since there is no package for the chip structure, the positional relationship between each chip can be set flexibly. At the same time, the small volume of the chip makes the volume of the PPG module small.

[0104] In some embodiments, the number of layers of the PD arranged on the reference axis can be different from the number of layers of the LED arranged based on the reference axis.

[0105] Figure 6 The schematic diagram of the PPG module with two-level LEDs arranged is shown. As Figure 6 shown in 6a, the central device is PD201, and PD202, PD203, and PD204 are arranged along the direction of the reference axis (the reference axis is not shown in 6a). The PD202, PD203, and PD204 are the first-level PD devices of the PPG module. LEDs are arranged along the extension direction of the reference axis. Each reference axis can include 2 LEDs. The LEDs 310, 312, and 314 form the first-level LED device, and the LEDs 311, 313, and 315 form the second-level LED device. Among them, the light-emitting chips of each level of LED devices can be the same. For example, the light-emitting chip in the LED 313 and the light-emitting chip in the LED 312 are the same (such as a green light chip).

[0106] In another example, the light-emitting chips in each level of LED devices can be different. As Figure 6As shown in 6b, the first - level PD devices in the PPG module include PD202, PD203, and PD204. LEDs 318 and 319 are arranged along the extending direction of the reference axis 501. LED 319 includes light - emitting chips 3191 and 3192. LED 318 includes one light - emitting chip. Optionally, LED 318 emits green light. Similarly, LEDs 316 and 317 are arranged along the extending direction of the reference axis 502, and the structure of LED 316 is the same as that of LED 319. LEDs 320 and 321 are arranged along the extending direction of the reference axis 503, and the structure of LED 321 is the same as that of LED 319. The LEDs 316, 318, and 320 form the first - level LED devices, and the LEDs 317, 319, and 321 form the second - level LED devices.

[0107] The PPG module in this example includes a first - level PD device, a first - level LED device, and a second - level LED device. That is, the number of layers of the light emitter and the number of layers of the light receiver are not the same. By setting multiple layers of light emitters, the flexibility of the layout is improved. If the LED layout is concentrated, due to optical signal interference and absorption caused by skin hair, moles, scars, tattoos, etc., the absorption of optical signals will occur, resulting in the problem of monitoring failure. In this example, the LEDs and PD devices form a decentralized layout, which can effectively penetrate the optical signals over a large range of the part to be measured, improve the situation of concentrated devices. At the same time, because of the decentralized layout of the LED devices, it helps to disperse the heat of the devices, improve the temperature characteristics of this PPG module, and avoid the harmful temperature rise caused by energy concentration. In traditional PPG modules, the optical measurement path is single, unable to cover a larger skin area, and is easily affected by the difference in skin quality at the measurement point; or the LED devices are concentratedly arranged, resulting in the problem of heat accumulation in the PPG module.

[0108] In another embodiment, both the number of layers of the light receiver and the number of layers of the light emitter can be multiple. As Figure 7 shown, in 7a, the reference axis 401, the reference axis 402, and the reference axis 403 divide the PCB board 20 into three parts of the same size. Along the extending direction of the reference axis 401, PD202 and PD206 can be arranged. Along the extending direction of the reference axis 402, PD204 and PD207 can be arranged. Along the extending direction of the reference axis 403, PD203 and PD206 can be arranged. The distance between two adjacent PDs on the reference axis can be equal or unequal. For example, the distance between PD202 and PD206 can be equal to the distance between PD202 and PD201, or the distance between PD202 and PD206 is not equal to the distance between PD202 and PD201.

[0109] After the first-level PD devices and the second-level PD devices are set up, the first-level LED devices, the second-level LED devices, the third-level LED devices, and the fourth-level LED devices can be set up based on the reference axis as shown in Figure 7 7b. Specifically, as shown in 7b, LED326, LED327, LED328, and LED329 can be arranged along the extending direction of the reference axis 501. Among them, LED326 and LED327 are used to monitor different human physiological parameters. For example, LED326 can emit green light to monitor the human heart rate, and LED327 includes two red light chips and an infrared light chip, which can be used to monitor the human blood oxygen. Similarly, LED322, LED323, LED324, and LED325 can be arranged along the extending direction of the reference axis 502, and LED330, LED331, LED332, and LED333 can be arranged along the extending direction of the reference axis 503. In this example, the first-level LED devices include: LED326, LED322, LED330. The second-level LED devices include: LED327, LED323, LED331; the third-level LED devices include: LED328, LED324, LED332; the fourth-level LED devices include: LED329, LED325, LED333.

[0110] In one embodiment, the multi-layer devices arranged based on the reference axis can be of different device types. As shown in Figure 8 , the PPG module includes: a reference axis 401, a reference axis 402, and a reference axis 403. The three reference axes divide the PCB board 20 evenly, and a reference axis is constructed between adjacent reference axes. Among them, the construction process of the reference axis and the reference axis is similar to the construction process in Figure 3 , and the relevant descriptions in 3a and 3b in Figure 3 can be referred to, and will not be elaborated here. PDs are arranged along the extending direction of the reference axis, and the geometric center or photosensitive center of the arranged PDs is located on the reference axis. For example, Figure 8PD203, PD202, and PD204. LED312, PD335, and LED313 are arranged in sequence along the direction of the reference axis 501. LED310, PD334, and LED311 are arranged in sequence along the direction of the reference axis 502. LED314, PD336, and LED315 are arranged in sequence along the direction of the reference axis 503. The distances between two adjacent devices on the reference axis can be the same or different. For example, the distance between LED310 and PD334 is equal to the distance between PD334 and LED311. Optionally, the distance between the first-layer device and the central device on the reference axis can be set according to the measurement requirements.

[0111] In some embodiments, the angles between each reference axis and the reference axis can be different. As Figure 9 shown in 9a, the PPG module includes a central device 201, a reference axis 401, a reference axis 402, and a reference axis 403. The three reference axes evenly divide the PCB board 20; reference axes are constructed between adjacent reference axes, such as the reference axis 501, the reference axis 502, and the reference axis 503. The construction process of the reference axis and the reference axis is similar to the construction process in Figure 3 , and reference can be made to the relevant descriptions in 3a and 3b in Figure 3 , and details will not be repeated here. PD202 is arranged along the extending direction of the reference axis 401; PD204 is arranged along the extending direction of the reference axis 402; PD203 is arranged along the extending direction of the reference axis 403. The angle α between the reference axis 501 and the reference axis 401, the angle β between the reference axis 502 and the reference axis 401, and the angle γ between the reference axis 503 and the reference axis 402. The angle α is not equal to the angle β, and the angle β is not equal to the angle γ, that is, the three angles α, β, and γ are all unequal. As Figure 9 shown in 9b, LED301 is arranged along the extending direction of the reference axis 502, LED302 is arranged along the extending direction of the reference axis 501, and LED303 is arranged along the extending direction of the reference axis 503; a PPG module as shown in 9b is formed.

[0112] Adopting the layout method of the PPG module as shown in Figure 9 b, since the angles between the reference axis and the two adjacent reference axes are different, the LED whose geometric center / sensing center is located on the reference axis can generate optical measurement channels with different lengths. The differentiated optical path channels enable the acquisition of PPG signals at different vascular positions, different optical penetration depths, and different blood perfusions of the skin tissue when measuring signals.

[0113] In another embodiment, other layout methods can also be adopted to obtain the differentiated optical path channels of the LED. As Figure 9The layout schematic diagram shown in 9c. At the central position of the PPG module (i.e., the geometric center position of the PCB board 20), a central device PD201 is arranged. During the layout process of the PPG module, there are also reference axes 401, 402, and 403; reference axes 501, 502, and 503. Among them, the construction process of the reference axes and the reference axes is similar to that in Figure 3 The construction process in can be referred to Figure 3 The relevant descriptions in 3a and 3b in will not be elaborated here. PD202 is arranged along the extension direction of the reference axis 401; PD204 is arranged along the extension direction of the reference axis 402; PD203 is arranged along the extension direction of the reference axis 403. The reference axis is used to assist in determining the position of the LED layout. In this example, the position of the LED layout can be determined according to the position close to the reference axis and the PPG measurement requirements.

[0114] For example, the PPG measurement requirements include measuring heart rate. When measuring heart rate, the LED needs to be arranged deviating from the PD. LED302 is arranged along the extension direction of the reference axis 501 and on one side deviating from the reference axis 501. LED301 is arranged along the extension direction of the reference axis 502 and on one side deviating from the reference axis 502. LED303 is arranged along the extension direction of the reference axis 503 and on one side deviating from the reference axis 503. In this example, no device is arranged at the position where the reference axis is located.

[0115] It should be noted that in this example, the angle between the reference axis and the adjacent reference axis can be the same or different.

[0116] Since no LED is arranged in the extension direction of the reference axis, the LED can also generate optical measurement channels of different lengths, forming a differentiated optical path, so that the obtained PPG signals are diverse, which can improve the accuracy of heart rate measurement.

[0117] In the above embodiment, a reference axis is constructed between adjacent two reference axes. In some embodiments, multiple (such as 2 or more) reference axes can be constructed between adjacent two reference axes.

[0118] For example, as Figure 10 shown in 10a, the central device (PD201) of the PPG module is arranged at the geometric center position of the PCB board 20. During the layout process of the PPG module, there are also reference axes 401, 402, and 403 constructed. In this example, the angles between adjacent reference axes are the same. Two reference axes can be constructed between adjacent two reference axes, such as Figure 10As shown in 10a, a reference axis 501 and a reference axis 504 are constructed between a reference axis 401 and a reference axis 403. A reference axis 502 and a reference axis 505 are constructed between the reference axis 401 and the reference axis 402; a reference axis 503 and a reference axis 506 are constructed between the reference axis 402 and the reference axis 403.

[0119] PD202 is arranged along the extending direction of the reference axis 401; PD204 is arranged along the extending direction of the reference axis 402; PD203 is arranged along the extending direction of the reference axis 403. The process of arranging PD devices on the reference axis can refer to Figure 3 the relevant description in 3c of, which will not be elaborated here. LED305 is arranged along the extending direction of the reference axis 501; LED302 is arranged along the extending direction of the reference axis 504; LED301 is arranged along the extending direction of the reference axis 505; LED304 is arranged along the extending direction of the reference axis 502; LED303 is arranged along the extending direction of the reference axis 503; LED306 is arranged along the extending direction of the reference axis 506. The process of arranging LED devices on the reference axis can refer to Figure 3 the relevant description in 3e of, which will not be elaborated here.

[0120] Optionally, the number of reference axes between each adjacent two reference axes can also be different. As Figure 10 shown in 10b, the central device (PD201) of this PPG module is arranged at the geometric center of the PCB board 20. The layout process of this PPG module also includes a reference axis 401, a reference axis 402 and a reference axis 403. A reference axis 501 and a reference axis 504 are constructed between the reference axis 401 and the reference axis 403. A reference axis 505 is constructed between the reference axis 401 and the reference axis 402; a reference axis 503 is constructed between the reference axis 402 and the reference axis 403. PD202 is arranged along the extending direction of the reference axis 401; PD204 is arranged along the extending direction of the reference axis 402; PD203 is arranged along the extending direction of the reference axis 403. LED305 is arranged along the extending direction of the reference axis 501; LED302 is arranged along the extending direction of the reference axis 504; LED301 is arranged along the extending direction of the reference axis 505; LED303 is arranged along the extending direction of the reference axis 503. The process of arranging PD devices on the reference axis can refer to Figure 3 the relevant description in 3c of, and the process of arranging LED devices on the reference axis can refer to Figure 3 the relevant description in 3e of, which will not be elaborated here.

[0121] In some embodiments, the central device located at the geometric center of the PCB board 20 can also be a light emitter. As Figure 11As shown in 11a, an LED 300 is provided at the geometric center of the PCB 20. Similar to Figure 3 3a, taking the geometric center of the PCB 20 as the origin, three virtual reference axes are constructed to equally divide the PCB 20, such as the reference axis 401, reference axis 402, and reference axis 403 shown in 11a. The three reference axes converge at the light-emitting center of the LED 300 and equally divide the PCB 20. Virtual reference axes are constructed between two adjacent reference axes, and each reference axis converges at the geometric center of the PCB 20. As Figure 11 shown in 11a, a reference axis 501 is constructed between the reference axis 402 and the reference axis 403; a reference axis 502 is constructed between the reference axis 402 and the reference axis 401; 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 can be different or the same.

[0122] Devices of the same type as the central device are arranged along the extending direction of the reference axis. As shown in 11a, an LED 301 is arranged along the extending direction of the reference axis 402, and a center line of the LED 301 coincides with this reference axis; an LED 302 is arranged along the extending direction of the reference axis 401, and a center line of the LED 302 coincides with this reference axis; an LED 303 is arranged along the extending direction of the reference axis 403, and a center line of the LED 303 coincides with this reference axis. A PD 204 is arranged along the extending direction of the reference axis 501, and a center line of the PD 204 can coincide with this reference axis; a PD 202 is arranged along the extending direction of the reference axis 502, and a center line of the PD 202 can coincide with this reference axis; a PD 203 is arranged along the extending direction of the reference axis 503, and a center line of the PD 203 can coincide with this reference axis.

[0123] Optionally, the device provided at the center position of the PCB 20 can also be a combination of multiple LEDs. As Figure 11As shown at 11b, the central device includes a combination of LED300 and LED322. The LED300 may include a monochromatic chip (such as a green chip), and the LED322 may include a dual-color chip (such as a red chip and an infrared chip). The combination of the LED300 and LED322 can be used to monitor multiple human physiological parameters. When there are two or more central devices, a symmetry axis of the central device can be constructed. The symmetry axis of the central device can be a straight line passing through the geometric center point of the PCB board 20 and bisecting the PCB board 20. For example, the diameter of the circular PCB board 20 in 2b can be used as the symmetry axis of the central device. The LED300 and LED322 can be symmetrically arranged based on the symmetry axis of the central device. The first center line of the LED300 and the first center line of the LED322 converge at the geometric center of the PCB board 20, and both the first center line of the LED300 and the first center line of the LED322 are perpendicular to the symmetry axis of the central device.

[0124] Based on the central device (i.e., LED300 and LED322), reference axes 401, 402, and 403 are constructed. As Figure 11 shown at 11b, a reference axis 501 is constructed between the reference axis 402 and the reference axis 403; a reference axis 502 is constructed between the reference axis 402 and the reference axis 401; a reference axis 503 is constructed between the reference axis 401 and the reference axis 403. The construction of the reference axes and the reference axis refers to Figure 3 the relevant description in, and will not be elaborated here.

[0125] Devices of the same type as the central device are arranged along the extending direction of the reference axis. That is, in this example, two LED combinations are arranged along the extending direction of the reference axis. The LED combination can be the same as or different from the LED combination in the central device. For example, it can be a combination of two LED chips, an LED package, or a combination of one LED chip and one LED package structure. As shown at 11b, LED316 and LED317 are arranged along the extending direction of the reference axis 402, LED318 and LED319 are arranged along the extending direction of the reference axis 401, and LED320 and LED321 are arranged along the extending direction of the reference axis 403. PD204 is arranged along the extending direction of the reference axis 501, PD202 is arranged along the extending direction of the reference axis 502, and PD203 is arranged along the extending direction of the reference axis 503.

[0126] The LEDs 316, 318, and 320 can be first-level LED devices, and the LEDs 317, 319, and 321 are second-level LED devices. Among them, the first-level LED devices and the second-level LED devices can monitor different physiological parameters of the human body. For example, the LEDs in the first-level LED devices can include monochromatic chips (such as green chips) to monitor the heart rate of the human body; the LEDs in the second-level LED devices can include multi-color chips (such as red chips and infrared chips) to monitor the blood oxygen of the human body.

[0127] In addition, the chips in the LEDs can also be chips of other colors, and different colors of chips can be used according to the monitoring requirements. For example, the LEDs can also include blue chips.

[0128] In some embodiments, the layout of the LEDs and PDs in the PPG module can also be other shapes. For example, the PD and the LED can form a square layout structure. The following combines Figure 12 Specifically, the PPG module with a directional layout is described.

[0129] For example, as Figure 12 shown in 12a, the PD 800 is arranged at the geometric center of the PCB board 20. Based on the PD 800, the reference axes 601, 602, 603, and 604 are constructed. In this example, the reference axes 601 and 603 are parallel and both converge at the photosensitive center of the PD 800, and the reference axes 602 and 604 are parallel and both converge at the photosensitive center of the PD 800. The reference axis 601 is perpendicular to the reference axis 602.

[0130] Similarly, reference axes are constructed between adjacent two reference axes, such as the reference axes 701, 702, 703, and 704 shown in 12a. The reference axes 701 and 703 are parallel and both converge at the photosensitive center of the PD 800, the reference axes 702 and 704 are parallel and both converge at the photosensitive center of the PD 800, and the reference axis 701 is perpendicular to the reference axis 702.

[0131] The PD 801 is arranged along the extending direction of the reference axis 601, the PD 802 is arranged along the extending direction of the reference axis 602, the PD 803 is arranged along the extending direction of the reference axis 603, and the PD 804 is arranged along the extending direction of the reference axis 604. The LED 901 is arranged along the extending direction of the reference axis 701, the LED 902 is arranged along the extending direction of the reference axis 702, the LED 903 is arranged along the extending direction of the reference axis 703, and the LED 904 is arranged along the extending direction of the reference axis 704. As Figure 12As shown in 12a, the connections of the devices other than PD800 form a square structure. In this example, the LED includes three light-emitting chips. For example, the light-emitting chips can be green light chips, red light chips, and infrared light chips.

[0132] Optionally, as Figure 12 shown in 12b, the LED900 is arranged at the geometric center of the PCB board 20. Based on the LED900, the reference axes 601, 602, 603, and 604 are constructed. In this example, the reference axis 601 and the reference axis 603 are parallel and both converge at the light-emitting center of the LED900, and the reference axis 602 and the reference axis 604 are parallel and both converge at the light-emitting center of the LED900. The reference axis 601 is perpendicular to the reference axis 602.

[0133] Similar to 12a, the reference axes 701, 702, 703, and 704 are constructed between adjacent two reference axes. The LED905 is arranged along the extending direction of the reference axis 601, the LED906 is arranged along the extending direction of the reference axis 602, the LED907 is arranged along the extending direction of the reference axis 603, and the LED908 is arranged along the extending direction of the reference axis 604. The PD805 is arranged along the extending direction of the reference axis 701, the PD806 is arranged along the extending direction of the reference axis 702, the PD807 is arranged along the extending direction of the reference axis 703, and the PD808 is arranged along the extending direction of the reference axis 704. As Figure 12 shown in 12b, the connections of the devices other than the LED900 form a square structure. In this example, the LED includes three light-emitting chips. For example, the light-emitting chips can be green light chips, red light chips, and infrared light chips.

[0134] The above embodiments specifically illustrate the layout method based on the reference axis and the reference axis in the present application. Next, in combination with Figure 13 and Figure 14 specifically illustrate each light measurement path of the PPG module in the working state of the present application.

[0135] Figure 13 It is a schematic diagram showing each light measurement path of an exemplary PPG module.

[0136] As Figure 13 shown, the central device of the PPG module is PD1, and a PD device is arranged in the extending direction of each reference axis, such as Figure 13 the PD2, PD3, and PD4 in Figure 13LED1, LED2, and LED3 therein. In this example, the light-emitting centers of the LED devices on the reference axis deviate from the reference axis. For example, the light-emitting chip of LED2 deviates from the reference axis by 1301. Similarly, the light-emitting chips of LED1 and LED3 also deviate from their respective reference axes (the reference axes of LED1 and LED3 are not shown).

[0137] When LED1 is lit (i.e., LED1 emits light), at least PD1, PD2, and PD4 will receive the light emitted by LED1. As Figure 13 shown, the LED1 device can respectively form optical measurement paths with the central device PD1 and the adjacent PD devices of the first layer (i.e., PD2 and PD4), that is, at least form optical measurement paths g1, g4, and g9. Similarly, when LED2 is lit, the LED2 respectively forms optical measurement paths g2, g5, and g6 with PD1, PD2, and PD3. When LED3 is lit, the LED3 respectively forms optical measurement paths g3, g7, and g8 with PD1, PD3, and PD4.

[0138] In this example, the photosensitive centers of PD2, PD3, and PD4 are all located on the reference axis, and the light-emitting centers of LED1, LED2, and LED3 deviate from the reference axis, forming an asymmetric layout relative to the reference axis. In this example, the angles between the reference axis and the adjacent reference axes are the same, and the distance between LED1 and PD1 is less than the distance from the light-emitting center of LED1 to PD2. And because the light-emitting center deviates from the reference axis, the distance from the light-emitting center of LED1 to PD4 is longer than the distance from the light-emitting center of LED1 to PD2. Therefore, when LED1 is lit, the lengths of the optical measurement paths are: g1 < g4 < g9. Similarly, for LED2 when it emits light, the lengths of the optical measurement paths are: g2 < g6 < g5. For LED3 when it emits light, the lengths of the optical measurement paths are: g3 < g8 < g7.

[0139] Each LED light source can form three optical measurement paths, and the lengths of the three optical measurement paths are not equal, thus forming three different optical paths, so that in terms of measurement signals, PPG signals of different blood vessel positions, different optical penetration depths, and different blood perfusions in the skin tissue can be obtained. Usually, under the same spectral wavelength and the same luminous energy, the longer the optical path, the higher the perfusion rate value of the PPG signal of the extracted blood perfusion, but the lower the energy of the corresponding signal and the lower the signal stability. On the contrary, when the optical path is shorter, the perfusion rate value of the PPG signal of the extracted blood perfusion is lower, but the energy of the signal is higher and the signal stability is high. In this example, the signal quality differentiation formed by different signal measurement channels can provide more signal choices for the algorithm, combine signal channels in different scenarios and modes, and improve the accuracy of monitoring human physiological parameters. In this layout method, the central device is PD1. The displacement of the central position of the PPG module relative to other edge positions is small, and it is not easy to separate from the part to be measured, avoiding direct incidence of ambient light outside or the light of the LED light source in the sensor into the optical receiver during measurement, causing serious interference to the PPG signal, and improving the anti-interference ability in the motion state. At the same time, each LED is received by the adjacent PD to receive optical energy at the same time, effectively improving the optical efficiency of the PPG module and reducing power consumption.

[0140] Figure 14 Schematic diagram of each optical measurement path of a PPG module shown for exemplary purposes.

[0141] As Figure 14 shown, the central device of this PPG module is LED4, and an LED device is arranged in the extending direction of each reference axis, such as Figure 14 LED4, LED5, LED6, and LED7 in. A PD device is arranged in the extending direction of each reference axis, such as Figure 14 PD5, PD6, and LED7 in. In this example, the light-emitting center of the LED device on the reference axis deviates from this reference axis. For example, the light-emitting chip of LED5 deviates from this reference axis by 1401. Similarly, the light-emitting chips of LED6 and LED7 also deviate from their respective reference axes (the respective reference axes of LED6 and LED7 are not shown).

[0142] When LED1 is lit (i.e., LED1 emits light), at least PD5, PD6, and PD7 will receive the light emitted by this LED4. As Figure 14As shown, the first-level LED devices can respectively form optical measurement paths with adjacent first-level PD devices. For example, LED5 can form an optical measurement path k5 with adjacent PD5, and LED5 can form an optical measurement path k6 with adjacent PD6. Similarly, when LED6 is lit, the LED6 respectively forms optical measurement paths k7 and k8 with PD6 and PD7. When LED7 is lit, the LED7 respectively forms optical measurement paths k4 and k9 with PD7 and PD5. In this example, the light-emitting center of LED4 deviates from the geometric center of the PCB board 20, and the light-emitting centers of LED5, LED6, and LED7 deviate from the reference axis, forming an asymmetric layout relative to the reference axis. In the example, the angle between the reference axis and the adjacent reference axis is the same. The distance from LED4 to PD6 is shorter than the distance from LED4 to PD5, and the distance from LED4 to PD7 is equal to the distance from LED4 to PD5. When LED5 is lit, since the light-emitting chip of LED6 deviates from the reference axis, the distance from the light-emitting chip to PD6 is less than the distance from the light-emitting chip to PD5, that is, the length of the optical measurement path is: k6 < k5. Similarly, when LED6 is lit, the length of the optical measurement path is: k8 < k7. When LED7 is lit, the length of the optical measurement path is: k4 < k9. In this example, each LED can form at least two optical measurement paths with different lengths, which can provide more signal choices for the algorithm; while in the traditional measurement module, the measurement of different indicators is often fixed to certain specific signal channels and cannot provide more channel choices for the algorithm.

[0143] The PPG module in the embodiment of the present application can be disposed in a wearable electronic device for monitoring human physiological parameters. For example, the PPG module is disposed in a smart watch. When the user wears the smart watch, the human physiological parameters can be monitored through the PPG module in the smart watch. In different usage scenarios, the monitoring requirements for the human body are different. The process of the smart watch monitoring human physiological parameters will be specifically described below with reference to FIG. 15 and Figure 16 Specifically illustrate the process of the smart watch monitoring human physiological parameters.

[0144] FIG. 15 is a schematic diagram of an exemplary usage scenario of a smart watch.

[0145] As Figure 15a shown in (1) of Figure 15aAs shown in (2), the central device of the PPG module is PD1, and a PD device is arranged along the extending direction of each reference axis, namely PD2, PD3, and PD4. An LED device is arranged along the extending direction of each reference axis, such as Figure 15a LED1, LED2, and LED3 in (2) of

[0146] The user can manually start the function of monitoring human physiological parameters of the smartwatch, or the smartwatch can start the function of monitoring human physiological parameters after detecting a preset trigger condition, and the trigger condition can be the monitoring time preset by the user. After starting the human physiological monitoring function, the following steps can be executed as Figure 16 shown.

[0147] Figure 16 Exemplarily shows a schematic diagram of the process of the smartwatch in FIG. 15 monitoring human physiological parameters.

[0148] Step 1601: The electronic device detects the posture of the electronic device.

[0149] In this example, after the smartwatch starts the function of monitoring human physiological parameters, the processor in the smartwatch can detect the posture of the smartwatch according to the posture sensor (such as a gyroscope). If the processor in the smartwatch determines that the posture of the smartwatch is different from the preset monitoring posture, it can remind the user to adjust the posture of the electronic device. If the processor determines that the posture of the smartwatch is the same as the preset monitoring posture, step 1602 can be executed.

[0150] Optionally, after the processor obtains the posture of the electronic device, step 1602 can also be directly executed.

[0151] Step 1602: The electronic device starts PD1, PD2, PD3, and PD4 to collect ambient light.

[0152] Exemplarily, the processor can control PD1, PD2, PD3, and PD4 to start, and the 4 PD devices can receive the ambient light of the environment where the electronic device is located. The processor can obtain the optical signals collected by PD1, PD2, PD3, and PD4 in the same period. PD1, PD2, PD, and PD can transmit the collected optical signals to the processor.

[0153] Step 1603: The electronic device determines whether the ambient light exceeds the preset ambient light threshold. If it exceeds the ambient light threshold, step 1604 is executed; if it does not exceed the ambient light threshold, step 1606 is executed.

[0154] Exemplarily, the preset ambient light threshold may be the ambient light collected by each PD of the smartwatch pre-stored in the electronic device. The maximum ambient light is obtained as the ambient light threshold corresponding to this posture. The preset posture may be the posture of the smartwatch when the PPG module monitors the human physiological parameters. For example, in the posture where the smartwatch is fully attached to the human skin, the ambient light collected by PD1 to PD4 is obtained and denoted as S1 to S4. The maximum ambient light is obtained from S1, S2, S3, and S4 (such as S1 < S2 < S3 < S4), then S4 is used as the ambient light threshold corresponding to the current posture. If there is only one preset posture, the ambient light threshold (S4) corresponding to the posture where the smartwatch is fully attached to the human skin can be used as the preset threshold.

[0155] Optionally, if there can be multiple preset postures, the maximum value can be selected from the ambient light of each preset posture as the preset ambient light threshold. For example, the ambient light of posture 1 includes S1, S4, the ambient light of posture 2 includes S2, S5, and the ambient light of posture 3 includes S3, S6. If S1 < S2 < S3 < S4 < S5 < S6, then S6 is selected as the preset ambient light threshold.

[0156] Exemplarily, when the processor receives the ambient light transmitted by 4 PDs, the ambient light collected by each PD can be compared with the preset ambient light threshold. When the processor detects that there is no ambient light exceeding the ambient light threshold, step 1606 can be executed. When the processor detects that there is ambient light exceeding the ambient light threshold, step 1604 can be executed.

[0157] Step 1604: The electronic device obtains the posture of the electronic device.

[0158] Exemplarily, the processor can determine the posture of the electronic device according to the ambient light collected by each PD device. In this example, PD1 is located in the middle of the PCB board, and PD2, PD3, and PD4 are located in different directions respectively. When the electronic device worn by the user is not fully attached to the user's skin, it will cause a large amount of light to enter in a certain direction. Based on this, the processor can determine the part of the PPG module that is not attached to the human skin.

[0159] For example, when the smartwatch is in the posture shown in (1) of Figure 15a the processor in the smartwatch activates PD1, PD2, PD3, and PD4 to collect the ambient light of the environment where the smartwatch is located. As shown in Figure 15aAs shown in (2), the light incident on PD2 in the PCB board 20 of the PPG module is greater than that on PD3 and PD4. PD1 is located at the center of the PCB board 20. When the PPG module is fully attached to the human skin, the light incident on PD1 is close to 0. When one side of the PPG module is higher than the other side, ambient light can enter the surrounding PD devices and PD1 located at the center position. As Figure 15a As shown in (2), if the processor detects that the ambient light of PD2 is higher than that of other PD devices and the ambient light of PD2 exceeds the preset threshold, the processor can determine that the position where PD2 is located is higher than the positions where other PD devices are located, that is, the position where PD2 is located is not attached to the human skin.

[0160] Optionally, after the processor determines the part of the electronic device that is not attached to the skin, it can further jointly determine the current posture of the electronic device based on the posture of the electronic device detected in step 1601.

[0161] Step 1605: The electronic device reminds the user to adjust the posture of the electronic device.

[0162] Exemplarily, the processor in the electronic device can output a prompt message according to the posture of the electronic device to remind the user to adjust the posture of the electronic device. For example, the processor can control the voice module of the smartwatch to output voice to indicate the user to adjust the posture of the smartwatch in a voice manner; the processor can also control the display screen of the smartwatch to display adjustment information, and the adjustment information can be text information.

[0163] The processor detects whether the posture of the electronic device has changed. If it detects that the posture has changed, it can re-execute step 1601.

[0164] After the user views the prompt message, the user can adjust the posture of the electronic device according to the prompt message. For example, as Figure 15b As shown in (1), the user adjusts the posture of the smartwatch from that shown in (1) of 15a to that shown in (1) of 15b. The smartwatch can re-detect the posture of the smartwatch, execute step 1602, and activate PD1, PD2, PD3, and PD4; as shown in (2) of 15b, the light incident on each of PD2, PD3, and PD4 is the same. The processor detects that the collected ambient light does not exceed the preset ambient light threshold, and then executes step 1606.

[0165] Step 1606: The electronic device obtains the PPG signal output by the PPG module in the current usage scenario of the electronic device.

[0166] Exemplarily, when the electronic device is in different usage scenarios, the PPG module can adopt different measurement modes and output the PPG signals collected in that mode. The specific process for the electronic device to obtain the PPG signals output by the PPG module in the current usage scenario of the electronic device can refer to Figure 17 , and the specific process is as follows:

[0167] Step 1701: The electronic device obtains the scenario data of the current usage scenario of the electronic device.

[0168] Exemplarily, the processor in the electronic device can obtain the scenario data of the current usage of the electronic device, and the scenario data can include one or more of the following combinations: the acceleration of the electronic device, the air pressure, temperature, or humidity of the environment where the electronic device is located, etc.

[0169] The scenario data can be obtained by other sensors monitoring the environment. For example, the acceleration sensor in a smartwatch can detect the acceleration of the electronic device; the temperature sensor in a smartwatch can detect the temperature of the environment.

[0170] Step 1702: The electronic device determines the usage scenario of the electronic device. If it is determined that the electronic device is in a static state, step 1703 is executed; if it is determined that the electronic device is in a moving state, step 1704 is executed; if it is determined that the electronic device is in an environment with low temperature and high altitude, step 1705 is executed.

[0171] Exemplarily, the processor can determine the usage scenario of the electronic device according to the scenario data. Optionally, the electronic device can store the scenario data corresponding to each usage scenario. When the processor detects that the acquired scenario data matches the stored scenario data, the usage scenario of the electronic device can be determined.

[0172] For example, the electronic device can store multiple usage scenarios: Scenario 1: Static scenario; Scenario 2: Dynamic scenario; Scenario 3: Low temperature and high altitude scenario. The acquired scenario data includes: acceleration V1, air pressure data P1; temperature data C1. If the processor detects that the speed V1 is within the speed range [Vth1, Vth2] in the static scenario, it is determined that the electronic device is in the static scenario. If the processor detects that the air pressure data P1 is within the air pressure range [Pth1, Pth2] corresponding to high altitude and the temperature data C1 is within the low temperature range [Cth1, Cth2], it is determined that the electronic device is in the scenario of low temperature and high altitude. If the processor detects that the speed V1 is within the speed range [Vth3, Vth4] in the moving scenario, it is determined that the electronic device is in the moving scenario. Wherein, Vth1 < Vth2 < Vth3 < Vth4; Pth1 < Pth2; Cth1 < Cth2.

[0173] Optionally, if the processor detects that the speed meets the static / dynamic scenario and the electronic device is in a low-temperature and high-altitude environment, the processor determines that the electronic device is in a low-temperature and high-altitude environment.

[0174] Step 1703: The electronic device determines the PPG signal collected by the PPG module when the electronic device is in a static state.

[0175] Exemplarily, there are at least two measurement modes of the PPG module in a static state, such as a normal measurement mode and an energy-saving mode. Figure 18 FIG. is a schematic flow chart of collecting a PPG signal by the PPG module when the electronic device is in a static state. The following combines the Figure 18 Specifically describe the process of the PPG module outputting the collected PPG signal in a static state, which includes the following sub-steps:

[0176] Sub-step 1801: The electronic device determines the measurement mode in a static state. If it is determined to adopt the normal measurement mode, sub-step 1802 is executed; if it is determined to adopt the energy-saving mode, sub-step 1806 is executed.

[0177] Exemplarily, there are multiple measurement modes in a static scenario. For example, a static scenario can include a normal measurement mode and an energy-saving mode. The triggering condition of the normal measurement mode can be: within a first preset time period. The triggering condition of the energy-saving mode can be: the running period is in a second period, such as the period when the user is resting, such as 23:00~6:00. Optionally, the triggering conditions of the normal measurement mode and the energy-saving mode can also include other contents. For example, the triggering conditions of the normal measurement mode and the energy-saving mode can also be receiving an instruction from the user to operate in the normal measurement mode / energy-saving mode.

[0178] Sub-step 1802: The electronic device turns on LED1, controls PD1, PD2, and PD4 to be connected in parallel, and controls PD1, PD2, and PD4 to receive signals.

[0179] Exemplarily, if the processor determines to adopt the normal measurement mode, the processor can instruct each light emitter to emit light in sequence; the processor also instructs the light receivers adjacent to the light emitter to be connected in parallel and receive optical signals.

[0180] For example, as Figure 15b shown in (2) of the PPG module, the processor can instruct LED1 to turn on. The PDs adjacent to the LED1 include: PD1, PD2, and PD4. The processor can control PD1, PD2, and PD4 to be connected in parallel and control PD1, PD2, and PD4 to receive signals. When LED1 is turned on, referring to Figure 13 , optical measurement optical paths g1, g4, and g9 can be formed.

[0181] It should be noted that the processor can control the series and parallel switching modes between PD devices by outputting control signals. For the description of the series and parallel switching between PD devices in this example, reference can be made to the switching modes of series and parallel connections between components in conventional technologies, which will not be elaborated here.

[0182] In the normal mode, after the processor receives the PPG signal (denoted as Sig_1) when LED1 is lit, the processor can instruct to light the next LED (such as performing sub-step 1803), simultaneously control LED1 to go out, and instruct PD1, PD2, and PD4 to stop receiving optical signals.

[0183] Sub-step 1803: The electronic device lights LED2, and controls PD1, PD2, and PD3 to be in parallel, and controls PD1, PD2, and PD3 to receive signals.

[0184] Exemplarily, as Figure 15b shown in (2) of the PPG module, the processor can instruct LED2 to be lit. The PDs adjacent to this LED2 include: PD1, PD2, and PD3. The processor can control PD1, PD2, and PD3 to be in parallel, and control PD1, PD2, and PD3 to receive signals. When LED2 is lit, referring to Figure 13 , optical measurement light paths g2, g5, and g6 can be formed.

[0185] In the normal mode, after the processor receives the PPG signal (denoted as Sig_2) when LED2 is lit, the processor can instruct to light the next LED (such as performing sub-step 1804), simultaneously control LED2 to go out, and instruct PD1, PD2, and PD3 to stop receiving optical signals.

[0186] Sub-step 1804: The electronic device lights LED3, and controls PD1, PD3, and PD4 to be in parallel, and controls PD1, PD3, and PD4 to receive signals.

[0187] Exemplarily, as Figure 15b shown in (2) of the PPG module, the processor can instruct LED3 to be lit. The PDs adjacent to this LED3 include: PD1, PD3, and PD4. The processor can control PD1, PD3, and PD4 to be in parallel, and control PD1, PD3, and PD4 to receive signals. When LED3 is lit, referring to Figure 13 , optical measurement light paths g3, g7, and g8 can be formed. PD1, PD3, and PD4 are in parallel, and the processor can obtain the PPG signal of this LED3 (denoted as Sig_3).

[0188] When the processor detects the PPG signals of all LEDs, it turns off this LED3 and controls each PD to stop receiving signals.

[0189] Sub-step 1805: The PPG module outputs the PPG signal collected in the normal measurement mode. After this step, step 1607 is executed.

[0190] Exemplarily, the processor may determine the signal output in the normal measurement mode based on the 3 received PPG signals. For example, the processor may select the PPG signal with the optimal signal quality from the 3 received PPG signals (i.e., Sig_1, Sig_2, and Sig_3) as the PPG signal collected by the PPG module in the normal measurement mode.

[0191] In this example, other methods may also be adopted to determine the signal output in the normal measurement mode. For example, the processor may also obtain any one of the 3 PPG signals as the PPG signal collected by the PPG module in the normal measurement mode. Optionally, the processor may also calculate the average signal of the 3 PPG signals as the PPG signal collected by the PPG module in the normal measurement mode.

[0192] Sub-step 1806: The electronic device controls LED1, LED2, and LED3 to be connected in parallel and lights up LED1, LED2, and LED3; controls PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals. Exemplarily, if the processor determines to adopt the energy-saving mode, the processor may instruct each light emitter to be connected in parallel and instruct each emitter to emit light; the processor also instructs each light receiver to be connected in parallel and receive optical signals.

[0193] For example, as Figure 13 shown in the PPG module, the processor may instruct LED1, LED2, and LED3 to be connected in parallel and light up LED1, LED2, and LED3. The processor controls PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals. Since LED1, LED2, and LED3 are connected in parallel, the power of the light emitter is reduced. Similarly, PD1, PD2, PD3, and PD4 are connected in parallel, which also reduces the power consumption of the PDs, thus achieving the purpose of energy-saving measurement.

[0194] PD1, PD2, PD3, and PD4 receive optical signals simultaneously and obtain a PPG signal, denoted as Sig_4.

[0195] Sub-step 1807: The PPG module outputs the PPG signal collected in the energy-saving mode. After this step, step 1607 is executed.

[0196] Exemplarily, the electronic device may use the PPG signal obtained in sub-step 1806 as the PPG signal collected by the PPG module in the energy-saving mode. For example, Sig_4 is used as the PPG signal collected in the energy-saving mode. After that, the processor executes step 1607 to determine whether the obtained PPG signal meets the measurement conditions.

[0197] The above sub-steps 1801 to 1806 are the process of determining the PPG signal collected by the PPG module when the electronic device is in a static state.

[0198] Step 1704: The electronic device determines the PPG signal collected by the PPG module when the electronic device is in a moving state.

[0199] Exemplarily, when it is determined that the scenario of the electronic device is a moving scenario, it can be measured in a manner corresponding to the moving scenario. In this example, due to displacement, flipping, and shaking of the sensor under the moving state, which may cause optical crosstalk, therefore, in the moving scenario, multiple measurements can be performed to obtain different PPG signals. For example Figure 13 As shown in the PPG module, the central device is PD1, and the central device is located at the center of the PCB board. The center position is less affected by the displacement, flipping, and shaking of the PPG module. Therefore, the processor can control each LED to light up in sequence and instruct PD to receive the signal to obtain the corresponding PPG signal (such as steps 1613 to 1615).

[0200] Figure 19 It is a schematic flowchart of the process of collecting the PPG signal by the PPG module when the electronic device is in a moving state. The following combines this Figure 19 Specifically describe the process of the PPG signal collected by the PPG module, which includes the following sub-steps:

[0201] Sub-step 1901: The electronic device turns on LED1 and controls PD1 to receive the signal.

[0202] When the processor obtains the PPG signal corresponding to LED1 (denoted as Sig_5), the processor can control LED1 to turn off.

[0203] Sub-step 1902: The electronic device turns on LED2 and controls PD1 to receive the signal.

[0204] When PD1 receives the PPG signal corresponding to LED2 (denoted as Sig_6) and transmits it to the processor, the processor can control LED2 to turn off.

[0205] Sub-step 1903: The electronic device turns on LED3 and controls PD1 to receive the signal.

[0206] When PD1 receives the PPG signal corresponding to LED2 (denoted as Sig_7) and transmits it to the processor, the processor can control LED2 to turn off. By selecting the optical measurement paths g1, g2, and g3 and receiving signals through PD1 located at the central position, optical crosstalk caused by displacement, flipping, and shaking of the sensor can be reduced.

[0207] Sub-step 1904: The electronic device controls LED1, LED2, and LED3 to be connected in parallel and lights up LED1, LED2, and LED3, and controls PD1 to receive signals.

[0208] Exemplarily, in a moving state, the processor can also control all LEDs to be connected in parallel and lit, and PD1 to receive signals. As Figure 13 shown, the processor controls LED1, LED2, and LED3 to be connected in parallel and lights up LED1, LED2, and LED3, and controls PD1 to receive signals. The processor obtains the PPG signal, denoted as Sig_8.

[0209] In this example, connecting all LEDs in parallel and lighting them can reduce power consumption during the measurement process.

[0210] Sub-step 1905: The electronic device controls LED1, LED2, and LED3 to be connected in parallel and lights up LED1, LED2, and LED3, and controls PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals. After this step, step 1906 is executed.

[0211] Exemplarily, in a moving state, the processor can also control all LEDs to be connected in parallel and lit, and control all PDs to be connected in parallel and receive signals. As Figure 13 shown, the processor controls LED1, LED2, and LED3 to be connected in parallel and lights up LED1, LED2, and LED3, and controls PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals. The processor obtains the PPG signal corresponding to this measurement method, denoted as Sig_9.

[0212] Sub-step 1906: The electronic device obtains the optimal PPG signal from multiple PPG signals. After executing step 1906, step 1607 is executed.

[0213] Exemplarily, the processor selects the optimal signal from the PPG signals obtained in steps 1901 to 1905. For example, it obtains the PPG signal with the best signal quality from Sig_5 to Sig_9. The optimal PPG signal will be obtained from multiple PPG signals.

[0214] The above sub-steps 1901 to 1906 are the process of determining the PPG signal collected by the PPG module when the electronic device is in a moving state.

[0215] Step 1705: The electronic device determines the PPG signal collected by the PPG module when the electronic device is in a low-temperature and high-altitude state.

[0216] Exemplarily, a long optical measurement channel has a higher pulse signal perfusion rate, and a short optical measurement signal channel has higher signal energy. When it is determined that the electronic device is in a low-temperature and high-altitude environment, a high perfusion rate is required. As Figure 13 shown, the optical measurement channels g9, g5, and g7 can be selected.

[0217] Figure 20 FIG. is a schematic flowchart of the PPG signal collected by the PPG module of the electronic device when the electronic device is in a low-temperature and high-altitude state, and the process includes the following sub-steps:

[0218] Sub-step 2001: The electronic device turns on LED1 and controls PD4 to receive signals.

[0219] The processor turns on LED1 and controls PD4 to receive signals, that is, measures through g9, and the processor obtains the PPG signal, denoted as Sig_10.

[0220] Sub-step 2002: The electronic device turns on LED2 and controls PD2 to receive signals.

[0221] The processor turns on LED2 and controls PD2 to receive signals, that is, measures through g5, and the processor obtains the PPG signal, denoted as Sig_11.

[0222] Sub-step 2003: The electronic device turns on LED3 and controls PD3 to receive signals.

[0223] The processor turns on LED3 and controls PD3 to receive signals, that is, measures through g7, and the processor obtains the PPG signal, denoted as Sig_12.

[0224] Sub-step 2004: The electronic device controls LED1, LED2, and LED3 to be connected in parallel and turns on LED1, LED2, and LED3, and controls PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals. After this step, sub-step 2005 is executed.

[0225] Exemplarily, when it is determined that the electronic device is in a low-temperature and high-altitude environment, the processor controls LED1, LED2, and LED3 to be connected in parallel and turns on LED1, LED2, and LED3, and controls PD1, PD2, PD3, and PD4 to be connected in parallel and receive signals. By increasing the optical signal channels, the optimal PPG signal can be obtained.

[0226] The processor lights up LED1, LED2, and LED3, and controls PD1, PD2, PD3, and PD4 to receive signals. The processor obtains a PPG signal, denoted as Sig_13.

[0227] Sub-step 2005: The electronic device obtains the optimal PPG signal from multiple PPG signals. After step 1906 is executed, step 1607 is executed.

[0228] Exemplarily, the processor can obtain the optimal signal from the PPG signals obtained in sub-steps 2001 to 2004, that is, select the optimal signal from Sig_10 to Sig_13.

[0229] The above sub-steps 2001 to 2005 are the process of determining the PPG signals collected by the PPG module when the electronic device is in a low-temperature and high-altitude state.

[0230] In this example, in combination with Figures 17 to 20 It specifically illustrates the process by which the electronic device obtains the PPG signals collected by the PPG module in various states. After the electronic device obtains the PPG signals collected by the PPG module in various states, step 1607 can be executed.

[0231] Step 1607: The electronic device determines whether the signal quality meets the measurement conditions. If it is determined that the measurement conditions are met, step 1608 is executed; if it is determined that the measurement conditions are not met, step 1609 is executed.

[0232] Exemplarily, a signal quality threshold can be set in advance. 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 conditions are met. If the processor determines that the signal quality of the PPG signal output in the current usage scenario does not exceed the signal quality threshold, it is determined that the measurement conditions are not met.

[0233] Step 1608: Obtain the measurement signal. After this step, step 1611 is executed.

[0234] Step 1609: The processor instructs the PPG module to perform a full-channel PPG signal inspection.

[0235] Exemplarily, the full-channel PPG signal inspection can be to obtain PPG signals through each optical measurement channel, that is, obtain all the PPG signals in sub-steps 1802 to 1806, sub-steps 1901 to 1905, and sub-steps 2001 to 2005, to obtain Sig_1 to Sig_13.

[0236] Step 1610: The processor obtains the optimal signal from the PPG signals corresponding to each channel as the measurement signal. After this step, step 1611 is executed.

[0237] Exemplarily, the processor selects the optimal PPG signal from Sig_1 to Sig_13 as the measurement signal.

[0238] Step 1611: The electronic device determines a measurement result according to the measurement signal.

[0239] Exemplarily, the processor can calculate human physiological parameters, such as heart rate, blood oxygen and other data, according to the measurement signal.

[0240] In this example, by adopting this PPG signal measurement method and judging the scenario, different measurement modes are started for different usage scenarios (that is, different LEDs and different PDs are started), rather than using the same measurement method, which improves the measurement accuracy and avoids the problem of being unable to monitor human physiological parameters in some scenarios. For example, in usage scenarios such as low temperature and high altitude, a high perfusion rate and a long path of the optical measurement path are required to achieve the monitoring of the human body.

[0241] Any content of each embodiment of the present application, as well as any content of the same embodiment, can be freely combined. Any combination of the above content is within the scope of the present application.

[0242] The embodiments of the present application have been described above with reference to the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. An electronic device, including a PPG module, characterized in that, Comprising: A central device, which is a photoreceiver; Three reference devices, which are arranged around the central device and are photoreceivers; Three reference components, each of which is arranged between two adjacent reference devices; wherein, the reference component is a light emitter.

2. The electronic device according to claim 1, wherein The central device, the reference devices and the reference components are all arranged on a PCB board.

3. The electronic device according to claim 2, wherein The shape of the PCB board is circular.

4. The electronic device according to any one of claims 1 to 3, characterized in that The included angle formed between every two adjacent reference devices and the central device is the same.

5. The electronic device according to claim 4, characterized in that, The distance between each reference device and the central device is equal.

6. The electronic device according to claim 5, wherein The distance between each reference component and the central device is equal.

7. The electronic device according to claim 6, characterized in that, The distance between each reference device and the central device is equal to the distance between each reference component and the central device.

8. The electronic device according to any one of claims 1 to 6, characterized in that, The light emitter includes a red light chip, an infrared light chip and a green light chip.

9. The electronic device according to any one of claims 1-8, characterized in that, The PPG module is packaged into a complete machine module through SIP.

10. The electronic device according to any one of claims 1-8, The photoreceiver is a packaging structure encapsulating a photoreceiving chip; and the light emitter adopts a packaging structure.

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