PPG sensor module, electronic device, wearable device and physiological information detection method

Abstract

The present application relates to a PPG sensor module, electronic device, wearable device and physiological information detection method. The PPG sensor module includes: at least three light-emitting components for emitting light signals; a light detection module for generating multiple detection signals based on the light signals emitted by each light-emitting component; each light sensor and at least two light-emitting components respectively form a first measurement channel, and the light sensor also forms a second measurement channel with at least one light-emitting component other than the first measurement channel; the length of the first measurement channel is less than the length of the second measurement channel; a controller for obtaining each detection signal and determining the heart rate information of the detection object based on the detection signal obtained from each first measurement channel, and the controller is also used to determine blood oxygen information based on the detection signal obtained from each first measurement channel and the detection signal generated based on each second measurement channel. The PPG module can simultaneously improve the accuracy of heart rate and blood oxygen detection.

Description

Technical Field

[0001] The present application relates to the technical field of smart devices, and in particular to a PPG sensor module, electronic device, wearable device and physiological information detection method. Background Art

[0002] With the development of smart devices, more and more smart devices have the function of detecting biological information (such as heart rate, blood oxygen saturation, etc.). The most common detection method for smart devices is through photoplethysmograph (PPG).

[0003] For smart devices that have both heart rate and blood oxygen saturation detection functions, since the optical path requirements of the two detections for optical signals conflict, when the accuracy of one signal detection is improved, the accuracy of the other signal detection may be reduced. Summary of the Invention

[0004] Based on this, it is necessary to provide a PPG sensor module, electronic device, wearable device and physiological information detection method that can simultaneously improve the accuracy of heart rate and blood oxygen saturation detection in response to the above technical problems.

[0005] A PPG sensor module, comprising:

[0006] at least three light-emitting components, each light-emitting component being configured to emit a light signal;

[0007] a light detection module comprising at least two light sensors configured to generate a plurality of detection signals based on light signals emitted by each of the light-emitting components; each light sensor forming a first measurement channel with at least two of the light-emitting components, and each light sensor forming a second measurement channel with at least one of the light-emitting components other than the first measurement channel; the length of the first measurement channel being less than the length of the second measurement channel;

[0008] a control module, configured to obtain each of the detection signals and determine the heart rate information of the detection subject based on the detection signals obtained by each of the first measurement channels; and further configured to determine the blood oxygen information of the detection subject based on the detection signals obtained by each of the first measurement channels and the detection signals generated by each of the second measurement channels.

[0009] An electronic device, comprising:

[0010] The housing is provided with a plurality of light-transmitting areas;

[0011] As in the above-mentioned PPG sensor module, each of the light-emitting components and each of the light sensors in the PPG sensor module receives or emits light through the light-transmitting area.

[0012] A wearable device comprising:

[0013] strap assembly;

[0014] As for the electronic device mentioned above, the strap assembly is used to fix the electronic device to the human body.

[0015] A physiological information detection method is applied to a PPG sensor module. The PPG sensor module includes at least three light-emitting components and a light detection module. The light detection module includes at least two light sensors. Each light sensor forms a first measurement channel with at least two of the light-emitting components. Each light sensor also forms a second measurement channel with at least one of the light-emitting components other than the first measurement channel. The length of the first measurement channel is less than that of the second measurement channel.

[0016] The method comprises:

[0017] Acquire a plurality of detection signals generated by the light detection module according to the light signals emitted by each of the light-emitting components;

[0018] selecting the detection signals obtained based on the first measurement channels to determine the heart rate information of the detection subject; and / or

[0019] The detection signals obtained based on the first measurement channels and the detection signals generated based on the second measurement channels are selected to determine the blood oxygen information of the detection subject.

[0020] The PPG sensor module, electronic device, wearable device, and physiological information detection method described above arrange the relative positions of at least three light-emitting components and a light detection module including at least two light sensors so that each light sensor forms a first measurement channel with at least two light-emitting components, and the light sensor also forms a second measurement channel with at least one light-emitting component other than the first measurement channel. The control module is capable of obtaining at least four detection signals generated based on the first measurement channel and at least two detection signals generated based on the first measurement channel. The control module determines the heart rate information of the detected subject based on the detection signals generated by the first measurement channel. Because the optical path distances of the detection signals generated by the first measurement channel are substantially the same, the optical power of these detection signals is also substantially the same. The short optical path distances can reduce the total noise of the detection signals during heart rate measurement and improve the accuracy of heart rate information detection. When detecting blood oxygen information, the control module performs calculations based on the multiple detection signals generated by the first measurement channel and the multiple detection signals generated by the second measurement channel. In addition to using signals with the same optical path distance for noise processing, the control module can also obtain multiple signals with different perfusion levels for calculation due to the presence of detection signals generated by different optical path distances, thereby improving the accuracy of blood oxygen information detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of a wearable device in one embodiment;

[0023] Figure 2 FIG1 is a planar structural view of a wearable device in one embodiment;

[0024] Figure 3a A schematic diagram of a PPG transmission detection technology in one embodiment;

[0025] Figure 3b A schematic diagram of a PPG reflective detection technology according to an embodiment;

[0026] Figure 4a This is a schematic diagram of the framework structure of a PPG sensor module according to one embodiment;

[0027] Figure 4b This is a second schematic diagram of the framework structure of a PPG sensor module according to an embodiment;

[0028] Figure 4c This is a third schematic diagram of the framework structure of a PPG sensor module according to an embodiment;

[0029] Figure 5 This is a fourth schematic diagram of the framework structure of a PPG sensor module according to an embodiment;

[0030] Figure 6 FIG1 is a flow chart of a physiological information detection method according to an embodiment;

[0031] Figure 7 FIG2 is a second flow chart of a physiological information detection method according to an embodiment;

[0032] Figure 8 FIG3 is a flow chart of a physiological information detection method according to an embodiment;

[0033] Figure 9a FIG4 is a fourth flow chart of a physiological information detection method according to an embodiment;

[0034] Figure 9b FIG5 is a fifth flow chart of a physiological information detection method according to an embodiment;

[0035] Figure 10 This is the sixth flow chart of the physiological information detection method according to an embodiment. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0037] It is understood that the terms "first," "second," and the like used herein may be used to describe various elements herein, but these elements are not limited by these terms. These terms are used solely to distinguish a first element from another element. For example, a first light-emitting component may be referred to as a second light-emitting component, and similarly, a second light-emitting component may be referred to as a first light-emitting component, without departing from the scope of this application. The first light-emitting component and the second light-emitting component are both light-emitting components, but they are not the same light-emitting component.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the description of this application, the meaning of "several" is at least one, such as one, two, etc., unless otherwise clearly and specifically defined.

[0039] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intervening element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if there is transmission of electrical signals or data between the connected objects.

[0040] like Figure 1 As shown in one embodiment, a wearable device is provided, wherein the wearable device 10 includes an electronic device 100 and a strap assembly 200. The electronic device 100 is mounted on the strap assembly 200 and can be worn on the user's wrist through the strap assembly 200. Figure 2 As shown, the electronic device 100 includes a housing 110 and electronic components such as a circuit board and a battery disposed within the housing 110. The housing 110 is provided with a mounting cavity, and the circuit board, battery and other electronic components are disposed within the mounting cavity. The housing 110 can be made of a non-metallic material such as plastic, rubber, silicone, wood, ceramic or glass. The housing 110 can also be made of a metal material such as stainless steel, aluminum alloy or magnesium alloy. The housing 110 can also be a metal injection molded part, that is, the metal material is used to ensure the structural rigidity of the housing 110, and the inner surface of the metal body is formed by injection molding with protrusions, grooves, threaded holes and other structures for assembly and positioning.

[0041] The housing 110 is provided with a plurality of light-transmitting areas, and the light-transmitting area 111 is used to transmit light, so as to transmit the light signals emitted and reflected by the electronic components of the PPG sensor module built into the housing 110, so as to detect vital signs such as human heart rate and blood oxygen saturation. Among them, the PPG detection technology is mainly divided into two types from the perspective of the layout of the PPG sensor module 120: one is the transmission detection technology, such as Figure 3a As shown in the figure, the changes in blood vessel volume during the cardiac cycle can be recorded according to the intensity of the transmitted light, and the heart rate, blood oxygen saturation, etc. can be obtained from them; one is the reflective detection technology, such as Figure 3bAs shown, the changes in vascular volume during the cardiac cycle can be recorded based on the intensity of the reflected light, and vital signs such as heart rate and blood oxygen saturation can be obtained from them. By combining the PPG sensor module 120 provided in this application with the wearable device 10, users can conveniently monitor their heart rate and blood oxygen saturation anytime and anywhere, thereby enriching the functionality of wearable electronic devices and greatly satisfying the user's health needs.

[0042] In one embodiment, the housing 110 is further provided with an opaque optical isolator 112 and a transparent window 113. The optical isolator 112 matches the size of the light-transmitting area 111 to prevent light crosstalk between the light-emitting component and the optical sensor of the PPG sensor module 120. The transparent window 113 covers the light-transmitting area 111 to provide waterproof and dustproof protection and increase the light transmittance of the PPG sensor module 120.

[0043] In one embodiment, the wearable device 10 is a smartwatch or wristband. The mounting cavity is provided with a battery, a circuit board, a display module, a PPG sensor module 120, and other electronic components. The circuit board can integrate the wearable device 10's processor, storage unit, communication module, and other electronic components. The battery can power the circuit board, display module, and other electronic components.

[0044] The housing 110 is generally rectangular, with the four corners of the rectangle chamfered to form rounded corners to enhance the wearable device 10's appearance. In one embodiment, the housing 110 can also be circular. The side of the housing 110 can be provided with a mating structure for mounting the strap assembly 200. The strap assembly 200 securely connects to the housing 110 through the mating structure, allowing the electronic device 100 to be securely worn on the user's hand. In one embodiment, the strap assembly 200 can be easily detached from the housing 110, allowing the user to easily replace the strap assembly 200. For example, a user can purchase a variety of strap assembly styles and change them based on the usage scenario to enhance convenience. For example, a user can use a more formal strap assembly 200 for formal occasions and a more casual strap assembly 200 for leisure and entertainment.

[0045] like Figure 4aAs shown, in one embodiment, the PPG sensor module includes at least three light-emitting components 121, a light detection module 122, and a control module 123. The light detection module 122 includes at least two light sensors PD. The light-emitting components 121 are used to emit light signals. Each light sensor PD in the light detection module 122 can generate a detection signal based on the light signals emitted by each light-emitting component 121. Each light sensor PD forms a first measurement channel d1 with at least two light-emitting components 121, and the same light sensor PD also forms a second measurement channel d2 with at least one light-emitting component 121 other than the first measurement channel. The length of the first measurement channel d1 is shorter than the length of the second measurement channel d2, so that the optical path traveled by the light signal sensed by the light sensor PD through the first measurement channel d1 is shorter than the optical path traveled by the light signal sensed by the light sensor PD through the second measurement channel d2. The control module 123 is used to obtain the various detection signals generated by the light detection module 122, and when performing heart rate information detection, select the detection signal obtained based on the first measurement channel d1 to determine the heart rate information of the detection subject; when performing blood oxygen information detection, the control module 123 selects the detection signal obtained based on each first measurement channel d1 and the detection signal generated based on each second measurement channel d2 to determine the blood oxygen information of the detection subject.

[0046] Exemplary, reference Figure 4a to Figure 4c The three light emitting components 121 are the first light emitting component LED1, the second light emitting component LED2, and the third light emitting component LED3. The first light sensor PD1 in the light detection module 122 and the first light emitting component LED1 constitute the first measurement channel d1 (Figure 4- Figure 4c The first measurement channel shown in FIG is an orthographic projection diagram), the light sensor PD and the second light emitting component LED2 form a first measurement channel d1, and at the same time, the first light sensor PD1 and the third light emitting component LED3 form a second measurement channel d2 (FIG. 4 to FIG. Figure 4c The second measurement channel shown in FIG is an orthographic projection diagram). When the light detection module 122 includes two light sensors (PD1 and PD2), the light detection module 122 and the three light emitting components 121 constitute four first measurement channels d1 and two second measurement channels d2. In the heart rate information detection mode, since the optical path distances of the first measurement channels d1 are substantially the same, the optical power P of the detection signal generated by each light sensor PD based on the first measurement channel d1 is PPG Basically consistent, when the noise influence caused by each optical path is not considered, the noise power P of the optical signal traveling through each first measurement channel d1 is noiseThe signal-to-noise ratio of the heart rate PPG signal calculated by the control module 123 based on the four detection signals generated by the first measurement channel d1 is increased to twice the signal-to-noise ratio under a single optical path. Since the total signal-to-noise ratio of multiple signals with the same optical path distance is the ratio of the total optical power to the total noise power, where the total optical power is the accumulation of each optical power, the total signal-to-noise ratio of each signal is accumulated for N signals. times, the calculation formula for the total signal-to-noise ratio (SNR) of the heart rate signal in this embodiment is as follows:

[0047]

[0048] Therefore, even if dynamic heart rate measurement is to be achieved, the interference of excessive noise on measurement accuracy caused by movement, jitter, etc. can be effectively reduced (fluctuations caused by excessive noise in the signal waveform will be mistaken for heart beats, so the noise has a great interference on heart rate measurement). There is no need to design dynamic heart rate measurement optical paths and static heart rate measurement optical paths separately. Moreover, since the optical path distances of each first measurement channel d1 are basically the same, the calculation logic of the heart rate PPG signal is also simpler, which can reduce the data processing complexity of the control module 123 and avoid introducing too much data to increase errors.

[0049] During blood oxygen information detection, the multiple blood oxygen PPG signals corresponding to each first measurement channel d1 can reduce the impact of noise during calculation. The same applies to the multiple blood oxygen PPG signals corresponding to each second measurement channel d2. In addition, since the first measurement channel d1 and the second measurement channel d2 have different corresponding optical path lengths, the longer the optical path, the higher the perfusion level of the resulting blood oxygen PPG signal. Therefore, the control module 123 can obtain blood oxygen PPG signals with different perfusion levels. According to research, when the perfusion level is low, blood oxygen value calculation errors (e.g., a calculation result of zero, a calculation result lost, or a large deviation in the calculation result) are prone to occur. Therefore, multiple second measurement channels d2 are provided to generate detection signals to provide high-perfusion blood oxygen PPG signals for calculation. The multiple low-perfusion blood oxygen PPG signals calculated based on the detection signals generated by the first measurement channel d1 are corrected. This can improve the accuracy of blood oxygen information detection while taking into account the effects of noise and perfusion on the blood oxygen PPG signal.

[0050] Based on the principle of PPG detection, when light signals pass through skin tissue and then reflect back to the optical sensor, they experience a certain degree of attenuation. When the measurement site is stable, light absorption by muscles, bones, veins, and other connective tissues remains essentially unchanged. However, due to blood flow in arteries, light absorption naturally varies. When converting the light signal into an electrical signal, the resulting signal can be divided into a direct current (DC) signal and an alternating current (AC) signal, precisely because arterial absorption varies while absorption by other tissues remains essentially unchanged. In reality, both the DC and AC signals are contaminated with noise, while the AC signal represents variations in light signal intensity caused by fluctuations in blood flow. Therefore, improving the signal-to-noise ratio (SNR) of the AC signal within the PPG signal is crucial for enhancing detection accuracy. The calculation principle of the AC signal's SNR shows that it is positively correlated with both the SNR of the DC signal and the perfusion level (perfusion level is the ratio of the AC signal to the DC signal, reflecting pulsatile blood flow and thus blood perfusion capacity). Therefore, improving perfusion level and / or the SNR of the DC signal can be used to enhance detection accuracy. However, in the heart rate detection scenario, since the detection object may experience excessive noise due to jitter caused by movement or other reasons, and the motion scene is complex, improving the signal-to-noise ratio of the AC signal by increasing the perfusion degree is less effective. Therefore, in the embodiment of the present application, multiple detection signals with substantially the same optical path distance are generated based on multiple first measurement channels d1, thereby reducing the total noise of the PPG signal and further improving the signal-to-noise ratio of the AC signal. In the blood oxygen detection scenario, the detection accuracy can be improved by increasing the perfusion degree and the total signal-to-noise ratio. Therefore, in the embodiment of the present application, based on the detection signals generated by multiple first measurement channels and the detection signals generated by multiple second measurement channels, the perfusion degree and the total signal-to-noise ratio are simultaneously increased to improve the signal-to-noise ratio of the AC signal and improve detection accuracy.

[0051] In one embodiment, the first light-emitting component LED1, the second light-emitting component LED2, and the third light-emitting component LED3 are arranged in a straight line with equal spacing. The second light-emitting component LED2 and each light sensor PD in the light detection module 122 each form a first measurement channel d1. The second light-emitting component LED2 is located at the center of the three light-emitting components 121, and the positions of the light sensors PD are set based on this position, so that each first measurement channel d1 forms a symmetrical optical path, and each second measurement channel d2 also forms a symmetrical optical path. When performing calculations using the detection signals formed by the symmetrical optical paths, errors caused by optical path differences can be reduced, thereby improving noise reduction.

[0052] like Figure 5As shown, in one embodiment, the light detection module 122 includes at least four light sensors PD, each of which (PD1, PD2, PD3, PD4), a first light-emitting component LED1, and a third light-emitting component LED3 are arranged in a ring with the second light-emitting component LED2 as the center. The four light sensors PD and the three light-emitting components can form eight first measurement channels and four second measurement channels, obtaining more detection signals and improving the accuracy of heart rate information detection and blood oxygen information detection. At the same time, the ring arrangement with the second light-emitting component LED2 as the center can make the first measurement channel d1 and the second measurement channel d2 formed by each light sensor PD as short as possible. The light detection module 122 and each light-emitting component 121 occupy the least space, reducing the space occupied by the PPG sensor module on the electronic device while improving the accuracy of heart rate information and blood oxygen information detection.

[0053] In one embodiment, the control module 123 is further used to control only the second light-emitting component LED2 to emit a light signal during a preset sleep period, and obtain a detection signal obtained based on the first measurement channel d1 composed of each light sensor PD and the second light-emitting component LED2, and determine the heart rate information and / or blood oxygen information of the detection object based on the aforementioned detection signal.

[0054] Because light signals emitted by the light-emitting components 121 located near the edges of the electronic device may leak light, if all light-emitting components 121 emit light signals during the dormant period, it may affect the rest or sleep of the detection subject. In this case, the control module 123 controls only the second light-emitting component LED2 located in the center to emit light signals, so as to obtain the detection signal generated by each light sensor PD based on the first measurement channel d1 formed by the second light-emitting component LED2. The dormant period refers to the rest and sleep period of the detection subject. The dormant period can be a universal period set according to the time zone of the detection subject, such as from 10 PM to 7 AM the next day. The dormant period can also be set by the detection subject based on personal circumstances. Specifically, the control module 123 of the PPG sensor module can be the main control module of the electronic device. The detection subject can set the time of its time zone (such as Beijing time) through the main control module when using the device for the first time or restoring the initial settings. After the setting is completed, if the dormant period is a universal setting, the detection subject does not need to set it manually. If the dormant time is set by the detection subject, one or more time periods can be set as needed. When the time read by the control module 123 coincides with the preset sleep period, the control module 123 controls only the second light-emitting component LED2 to emit a light signal, so as to avoid affecting the rest or sleep of the detection object.

[0055] In one embodiment, the light detection module 122 is further configured to detect ambient light and generate an ambient signal based on the ambient light, which is used to provide feedback on the ambient light intensity. The control module 123 is further configured to receive the ambient signal and, when the ambient light intensity is below a preset light intensity threshold, control only the second light-emitting component LED2 to emit a light signal, thereby obtaining a detection signal from the first measurement channel d1 formed by each light sensor PD and the second light-emitting component LED2, and determining the subject's heart rate information and / or blood oxygen information based on the detection signal. One or more light sensors PD in the light detection module 122 can be used to detect ambient light and generate an ambient signal that is fed back to the control module 123. The control module 123 determines whether the ambient signal is below the preset light intensity threshold. If so, it determines that the subject is currently in a low-light environment, meaning that the subject may be resting or in a low-light environment such as a movie theater. Because the light signal emitted by the light-emitting component 121, which is located near the edge of the electronic device, may leak light, the control module 123 controls only the second light-emitting component LED2 to emit a light signal to detect the heart rate information and / or blood oxygen information, thereby alleviating the light leakage problem.

[0056] In one embodiment, the light-emitting component 121 is used to emit at least one of green light, red light, and infrared light as a light signal; the control module 123 is used to determine the heart rate information based on the green light when detecting the heart rate information; the control module 123 is also used to determine the blood oxygen information based on the red light and infrared light when detecting the blood oxygen information.

[0057] When detecting heart rate information, green light is used as the optical signal for measurement. Compared to red or infrared light, the human body absorbs green light better, resulting in greater changes in reflected light due to heartbeats. This means that the detection signal generated based on green light has a larger amplitude of change. Furthermore, green light is more resistant to the influence of ambient light, making it more conducive to measuring heart rate information. When detecting blood oxygen information, red and infrared light are used for measurement. Because red and infrared light have greater penetrability than green light, and based on the principle of blood oxygen measurement, since oxygenated hemoglobin in blood has a higher absorption capacity for infrared light, and hemoglobin has a higher absorption capacity for red light, the blood oxygen value can be calculated by detecting the absorption values ​​of oxygenated hemoglobin and hemoglobin using red and infrared light, respectively. Therefore, depending on the current detection mode being executed, the control module 123 controls the light-emitting component 121 to emit different optical signals to achieve detection. Specifically, the light-emitting component 121 includes a green light emitter, a red light emitter, and an infrared light emitter. In one embodiment, the light-emitting component 121 can also be a three-in-one emitter that combines green, red, and infrared light.

[0058] In one embodiment, the control module 123 is further configured to control each light-emitting component 121 to sequentially emit light signals according to a preset light-emitting sequence, obtain multiple detection signals generated by the light detection module 122, and distinguish between detection signals generated based on the first measurement channel d1 and detection signals generated based on the second measurement channel d2 based on the light-emitting sequence. Because the control module 123 needs to select different detection signals based on the detection mode, by causing each light-emitting component 121 to emit light according to a preset light-emitting sequence, the control module 123 distinguishes each detection signal based on whether the measurement channel formed by each light-emitting component 121 and the different light sensors PD is the first measurement channel d1 or the second measurement channel d2, thereby facilitating subsequent signal selection.

[0059] by Figure 4b Take an example to illustrate: when the first light-emitting component LED1 emits light, the first light sensor PD1 generates a detection signal based on the first measurement channel d1, and the second light sensor PD2 generates a detection signal based on the second measurement channel d2. The control module 123 records and classifies the detection signal fed back by the first light sensor PD1 as the detection signal corresponding to the first measurement channel d1, and classifies the detection signal fed back by the second light sensor PD2 as the detection signal corresponding to the second measurement channel d2; when the second light-emitting component LED2 emits light, the first light sensor PD1 generates a detection signal based on the first measurement channel d1, and the second light sensor PD2 generates a detection signal based on the first measurement channel d1. The control module Block 123 records and classifies the detection signal fed back by the first light sensor PD1 as the detection signal corresponding to the first measurement channel d1, and classifies the detection signal fed back by the second light sensor PD2 as the detection signal of the first measurement channel d1; when the third light-emitting component LED3 emits light, the first light sensor PD1 generates a detection signal based on the second measurement channel d2, and the second light sensor PD2 generates a detection signal based on the first measurement channel d1, and the control module 123 records and classifies the detection signal fed back by the first light sensor PD1 as the detection signal corresponding to the second measurement channel d2, and classifies the detection signal fed back by the second light sensor PD2 as the detection signal of the first measurement channel d1.

[0060] In one embodiment, the control module 123 may further control each light emitting component 121 to emit light signals of different light intensities to achieve differentiation of detection signals generated based on different measurement channels.

[0061] An embodiment of the present application also provides an electronic device, which may include the PPG sensor module in any of the above embodiments, and can detect the heart rate and blood oxygen saturation of a human body, thereby improving its measurement accuracy.

[0062] like Figure 6As shown, the embodiment of the present application further provides a physiological information detection method, which can be applied to the above-mentioned PPG sensor module. The method includes steps 602 to 606:

[0063] Step 602: Acquire multiple detection signals generated by the light detection module according to the light signals emitted by each light emitting component;

[0064] Step 604: Determine the heart rate information of the subject based on the detection signals obtained from each first measurement channel; and / or

[0065] Step 606 : Select the detection signals obtained based on the first measurement channels and the detection signals generated based on the second measurement channels to determine the blood oxygen information of the test subject.

[0066] To be applied to Figure 4a Taking the control module in the PPG sensor module shown as an example, the control module obtains multiple detection signals generated by the light sensor PD1 and the light sensor PD2 in the light detection module according to the light signals emitted by each light-emitting component (LED1, LED2, LED3), including the detection signal A1 generated by the light sensor PD1 based on the first measurement channel d1 constituted with LED1, the detection signal A2 generated by the light sensor PD1 based on the first measurement channel d1 constituted with LED2, the detection signal B1 generated by the light sensor PD1 based on the second measurement channel d2 constituted with LED3, the detection signal A3 generated by the light sensor PD2 based on the first measurement channel d1 constituted with LED1, the detection signal A4 generated by the light sensor PD2 based on the first measurement channel d1 constituted with LED2, and the detection signal B2 generated by the light sensor PD2 based on the second measurement channel d2 constituted with LED3. During heart rate information detection, the control module selects detection signals A1, A2, A3, and A4 based on each first measurement channel to determine the heart rate information of the detection subject. Since the optical path distances of the detection signals generated based on the first measurement channels are substantially the same, the optical powers of these detection signals are also substantially the same, and the optical path record is relatively short, which can reduce the total noise of the detection signals in the heart rate measurement and improve the detection accuracy of the heart rate information. During blood oxygen information detection, the control module selects detection signals A1, A2, A3, and A4 obtained based on each first measurement channel d1, and detection signals B1 and B2 obtained based on each second measurement channel d2 to determine the blood oxygen information of the detection subject. In addition to being able to use signals with the same optical path distance for noise processing, due to the presence of detection signals generated based on different optical path distances, the control module can also obtain multiple signals with different perfusion degrees for calculation to improve the detection accuracy of the blood oxygen information.

[0067] In one embodiment, the PPG sensor module includes at least a first light-emitting component, a second light-emitting component, and a third light-emitting component; the first light-emitting component, the second light-emitting component, and the third light-emitting component are arranged in the same straight line with equal spacing, and the second light-emitting component and each light sensor respectively form a first measurement channel. Figure 7 As shown, the physiological information detection method includes steps 702 to 706:

[0068] Step 702, controlling only the second light-emitting component to emit a light signal during a preset sleep period;

[0069] Step 704: Acquire a detection signal obtained based on a first measurement channel formed by each light sensor and the second light-emitting component;

[0070] Step 706: Determine the heart rate information and / or blood oxygen information of the detection subject according to the detection signal.

[0071] Since the light signals emitted by the light emitting components located near the edge of the electronic device may leak light, if all the light emitting components emit light signals during the dormant period, it may affect the rest or sleep of the detection object. At this time, the control module controls only the second light emitting component LED2 located at the center to emit light signals, so as to obtain the detection signals generated by each light sensor PD based on the first measurement channel d1 formed with the second light emitting component LED2. Figure 5 Taking the PPG sensor module shown as an example, it includes a detection signal A1 generated by the first measurement channel d1 composed of the light sensor PD1 and the second light-emitting component LED2, a detection signal A2 generated by the first measurement channel d1 composed of the light sensor PD2 and the second light-emitting component LED2, a detection signal A3 generated by the first measurement channel d1 composed of the light sensor PD3 and the second light-emitting component LED2, and a detection signal A4 generated by the first measurement channel d1 composed of the light sensor PD4 and the second light-emitting component LED2. The control module determines the heart rate information and / or blood oxygen information of the detection object according to the detection signals A1, A2, A3 and A4.

[0072] In one embodiment, Figure 8 As shown, the physiological information detection method further includes steps 802 to 808:

[0073] Step 802, obtaining an ambient signal generated by the light detection module according to the ambient light;

[0074] Step 803, determining whether the ambient light intensity is lower than a preset light intensity threshold according to the ambient signal;

[0075] Step 804: If the ambient light intensity is lower than the preset light intensity threshold, control only the second light-emitting component to emit a light signal;

[0076] Step 805: If the intensity of the ambient light is not lower than the preset light intensity threshold, control each light emitting component to emit a light signal;

[0077] Step 806: acquiring a detection signal obtained based on a first measurement channel formed by each light sensor and the second light emitting component;

[0078] Step 808: Determine the heart rate information and / or blood oxygen information of the detection subject according to the detection signal.

[0079] The light detection module is also used to generate an environmental signal based on the ambient light. The environmental signal is used to reflect the ambient light intensity. The control module obtains the environmental signal fed back by the light detection module and determines whether the ambient light intensity is lower than a preset light intensity threshold. If it is lower, it is determined that the current environment is low-light, that is, the detection object may be in a resting state, or in a low-light environment such as a movie theater. Since the light signal emitted by the light-emitting component located near the edge of the electronic device may leak light, the control module controls only the second light-emitting component LED2 to emit a light signal to detect heart rate information and / or blood oxygen information. Figure 5 Taking the PPG sensor module shown as an example, the control module obtains the detection signal generated by the light detection module according to the light signal emitted by the second light-emitting component LED2, including: the detection signal A1 generated by the first measurement channel d1 composed of the light sensor PD1 and the second light-emitting component LED2, the detection signal A2 generated by the first measurement channel d1 composed of the light sensor PD2 and the second light-emitting component LED2, the detection signal A3 generated by the first measurement channel d1 composed of the light sensor PD3 and the second light-emitting component LED2, and the detection signal A4 generated by the first measurement channel d1 composed of the light sensor PD4 and the second light-emitting component LED2. The control module determines the heart rate information and / or blood oxygen information of the detection object according to the detection signals A1, A2, A3 and A4.

[0080] In one embodiment, Figure 9a and Figure 9b As shown, the physiological information detection method further includes step 902 or step 904:

[0081] Step 902: upon receiving a heart rate information detection indication, controlling the light emitting component to emit green light;

[0082] Step 904: upon receiving a blood oxygen information detection indication, control the light-emitting component to emit red light and infrared light.

[0083] Because green light improves the accuracy of heart rate detection, the control module controls the light-emitting component to emit green light when receiving a heart rate detection indication. When receiving a blood oxygen detection indication, red and infrared light can more accurately detect the absorption values ​​of red blood cells and oxygenated red blood cells, thereby calculating blood oxygen saturation. Therefore, the control module controls the light-emitting component to emit red and infrared light. The heart rate and blood oxygen detection indications can be task instructions executed by the control module according to a preset detection cycle, or they can be instructions input by the user.

[0084] In one embodiment, Figure 10 As shown, the step of obtaining a plurality of detection signals generated by the light detection module according to the light signals emitted by each light-emitting component includes steps 1002 to 1006:

[0085] Step 1002, controlling each light emitting component to emit light signals in sequence according to a preset light emitting sequence;

[0086] Step 1004, obtaining a plurality of detection signals generated by the light detection module according to the light signals emitted by each light emitting component;

[0087] Step 1006 : Identify the detection signal generated by the light detection module based on the first measurement channel and the detection signal generated based on the second measurement channel according to the light emission sequence.

[0088] Since the control module needs to select different detection signals according to the detection mode, the control module distinguishes each detection signal by making each light-emitting component emit light according to a preset light-emitting sequence, and determines whether the measurement channel formed by each light-emitting component corresponding to the different light sensors PD is the first measurement channel d1 or the second measurement channel d2, so as to facilitate the selection of subsequent signals.

[0089] It should be understood that although Figures 6-10 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figures 6-10 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The order of execution of these steps or stages is not necessarily one by one, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0090] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0091] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0092] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0093] Throughout this specification, references to "some embodiments," "one embodiment," and the like indicate that a particular feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative descriptions of these terms do not necessarily refer to the same embodiment or example.

[0094] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A PPG sensor module, characterized in that: include: at least three light-emitting components, each light-emitting component being configured to emit a light signal; a light detection module comprising at least four light sensors configured to generate a plurality of detection signals based on light signals emitted by each of the light-emitting components; each light sensor forming a first measurement channel with at least two of the light-emitting components, and each light sensor forming a second measurement channel with at least one of the light-emitting components other than the first measurement channel; the length of the first measurement channel being less than the length of the second measurement channel; A control module is configured to obtain the detection signals and determine the heart rate information of the detection subject based on the detection signals obtained by each of the first measurement channels. The control module is further configured to determine the blood oxygen information of the detection subject based on the detection signals obtained by each of the first measurement channels and the detection signals generated by each of the second measurement channels. The PPG sensor module includes at least a first light-emitting component, a second light-emitting component, and a third light-emitting component. The first light-emitting component, the second light-emitting component, and the third light-emitting component are arranged in sequence and at equal intervals on the same straight line. The second light-emitting component and each of the light sensors in the light detection module respectively constitute a first measurement channel. The light sensors, the first light-emitting component, and the third light-emitting component are arranged in a ring with the second light-emitting component as the center.

2. The PPG sensor module according to claim 1, characterized in that: The control module is also used to control only the second light-emitting component to emit a light signal during a preset sleep period, and obtain the detection signal obtained based on the first measurement channel formed by each light sensor and the second light-emitting component; and determine the heart rate information and / or blood oxygen information of the detection object based on the detection signal.

3. The PPG sensor module according to claim 1, characterized in that: The light detection module is further used to detect ambient light and generate an ambient signal according to the ambient light; The control module is further configured to receive the ambient signal and, when the ambient light intensity is lower than a preset light intensity threshold, control only the second light-emitting component to emit the light signal; the control module is further configured to obtain the detection signal obtained based on the first measurement channel formed by each of the light sensors and the second light-emitting component; and determine the heart rate information and / or blood oxygen information of the detected subject based on the detection signal.

4. The PPG sensor module according to claim 1, characterized in that: The light emitting component is used to emit at least one of green light, red light, and infrared light as the optical signal; The control module is used to determine the heart rate information based on green light; the control module is also used to determine the blood oxygen information based on red light and infrared light.

5. The PPG sensor module according to claim 1, characterized in that: The control module is further configured to control each of the light-emitting components to emit light signals in sequence according to a preset light-emitting sequence, obtain the plurality of detection signals generated by the light detection module, and identify the detection signal generated based on the first measurement channel and the detection signal generated based on the second measurement channel according to the light-emitting sequence.

6. The PPG sensor module according to claim 1, characterized in that: The light emitting component includes a green light emitter, a red light emitter and an infrared light emitter.

7. An electronic device, characterized in that: include: The housing is provided with a plurality of light-transmitting areas; The PPG sensor module according to any one of claims 1 to 6, wherein each light-emitting component and each light sensor in the PPG sensor module receives or emits light through the light-transmitting area.

8. A wearable device, characterized in that: include: strap assembly; The electronic device according to claim 7, wherein the strap assembly is used to secure the electronic device to a human body.

9. A physiological information detection method, characterized in that: Applied to a PPG sensor module, the PPG sensor module includes at least three light-emitting components and a light detection module. The light detection module includes at least four light sensors. Each light sensor forms a first measurement channel with at least two of the light-emitting components, and the light sensor also forms a second measurement channel with at least one light-emitting component other than the first measurement channel. The length of the first measurement channel is shorter than that of the second measurement channel. The PPG sensor module includes at least a first light-emitting component, a second light-emitting component, and a third light-emitting component. The first, second, and third light-emitting components are arranged in a straight line with equal spacing, and the second light-emitting component forms a first measurement channel with each light sensor. The light sensors, the first light-emitting component, and the third light-emitting component are arranged in a ring with the second light-emitting component as the center. The method comprises: Acquire a plurality of detection signals generated by the light detection module according to the light signals emitted by each of the light-emitting components; selecting the detection signals obtained based on the first measurement channels to determine the heart rate information of the detection subject; and / or The detection signals obtained based on the first measurement channels and the detection signals generated based on the second measurement channels are selected to determine the blood oxygen information of the detection subject.

10. The physiological information detection method according to claim 9, characterized in that: The method further comprises: During a preset sleep period, only the second light-emitting component is controlled to emit a light signal; Acquire the detection signal obtained based on the first measurement channel formed by each of the light sensors and the second light-emitting component; The heart rate information and / or blood oxygen information of the detection object is determined according to the detection signal.

11. The physiological information detection method according to claim 9, characterized in that: The method further comprises: Acquire an ambient signal generated by the light detection module according to the ambient light; If the intensity of the ambient light is lower than a preset light intensity threshold, controlling only the second light-emitting component to emit a light signal; Acquire the detection signal obtained based on the first measurement channel formed by each of the light sensors and the second light-emitting component; The heart rate information and / or blood oxygen information of the detection object is determined according to the detection signal.

12. The physiological information detection method according to claim 9, characterized in that: The light emitting component is used to emit at least one of green light, red light, and infrared light as the optical signal; The method further comprises: Upon receiving a heart rate information detection indication, controlling the light emitting component to emit green light; When a blood oxygen information detection indication is received, the light emitting component is controlled to emit red light and infrared light.

13. The physiological information detection method according to claim 9, characterized in that: The step of obtaining a plurality of detection signals generated by the light detection module according to the light signals emitted by each light emitting component comprises: Controlling each of the light-emitting components to emit light signals in sequence according to a preset light-emitting sequence; Acquire a plurality of detection signals generated by the light detection module according to the light signals emitted by each of the light-emitting components; The detection signal generated by the light detection module based on the first measurement channel and the detection signal generated based on the second measurement channel are identified according to the light emission sequence.

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