CN113197553A - Electronic device and biological information detection method - Google Patents
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- 238000001514 detection method Methods 0.000 title claims abstract description 60
- 238000013186 photoplethysmography Methods 0.000 claims abstract description 122
- 210000004369 blood Anatomy 0.000 claims description 33
- 239000008280 blood Substances 0.000 claims description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 26
- 230000003287 optical effect Effects 0.000 claims description 26
- 229910052760 oxygen Inorganic materials 0.000 claims description 26
- 239000001301 oxygen Substances 0.000 claims description 26
- 238000012545 processing Methods 0.000 claims description 22
- 210000000707 wrist Anatomy 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 15
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 210000001519 tissue Anatomy 0.000 description 15
- 238000010586 diagram Methods 0.000 description 12
- 108010054147 Hemoglobins Proteins 0.000 description 8
- 102000001554 Hemoglobins Human genes 0.000 description 8
- 108010064719 Oxyhemoglobins Proteins 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 210000001367 artery Anatomy 0.000 description 5
- 230000031700 light absorption Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 3
- 238000002496 oximetry Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
- A61B5/02427—Details of sensor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
- A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
- A61B5/14551—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters for measuring blood gases
- A61B5/14552—Details of sensors specially adapted therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/04—Arrangements of multiple sensors of the same type
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/16—Details of sensor housings or probes; Details of structural supports for sensors
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Abstract
The present disclosure relates to an electronic device and a biological information detection method, the electronic device including: a light emitting assembly comprising a first light emitting unit for emitting a first light signal for forming a first photoplethysmography, PPG, signal; the light detectors are arranged around the light emitting assembly and used for receiving a first reflected light signal formed by reflection of the first light signal and generating a first PPG signal corresponding to the first reflected light signal; a processor for determining biological information of the user to be detected from the first PPG signal generated by the at least one light detector. According to the technical scheme of the embodiment of the disclosure, the PPG signals in a plurality of position directions can be obtained, so that the problem of inaccurate detection results caused by differences of biological tissues or wearing habits of a user can be avoided, and the accuracy of biological information detection of the user is improved.
Description
Technical Field
The present disclosure relates to the field of electronic devices, and in particular, to an electronic device and a biological information detection method.
Background
With the development and progress of technology, wearable devices are widely used, and how to detect biological information of a user, such as heart rate or blood oxygen saturation, through the wearable devices becomes a focus of attention.
The PPG (photoplethysmography) method is to detect reflected light absorbed by blood and tissue of a human body, trace out a PPG signal corresponding to a light source, and obtain biological information of a user, such as heart rate or blood oxygen saturation information, according to the PPG signal. In a related technical solution, in a wearable device, an LED (Light-Emitting Diode) is used as a Light source, a PD (Photo-Diode) is used as a Photo detector, and a PPG (Photoplethysmograph) method is used to detect biological information of a user.
However, in such a technical solution, it may be difficult to accurately detect the biological information of the user due to differences in biological tissues or wearing habits of the user.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to an electronic device and a biological information detecting method, so as to overcome, at least to some extent, a problem that it is difficult to accurately detect biological information of a user due to a difference in biological tissues or wearing habits of the user.
According to an aspect of the present disclosure, there is provided an electronic device including:
a light emitting assembly comprising a first light emitting unit for emitting a first light signal for forming a first photoplethysmography, PPG, signal;
a plurality of photodetectors disposed around the light emitting assembly, the photodetectors configured to receive a first reflected light signal formed by reflection of the first light signal and generate the first PPG signal corresponding to the first reflected light signal;
a processor for determining biological information of a user to be detected from the first PPG signal generated by at least one of the light detectors.
According to another aspect of the present disclosure, there is provided a biological information detection method applied to an electronic device including: a light emitting assembly comprising a first light emitting unit to emit a first light signal, the first light signal to generate a first PPG signal; a plurality of light detectors disposed around the light emitting assembly, the method comprising:
receiving, by the photodetector, a first reflected light signal formed by reflection of the first light signal and generating the first PPG signal corresponding to the first reflected light signal;
determining biological information of a user to be detected from the first PPG signal generated by at least one of the light detectors.
According to the electronic device and the biological information detection method provided by the embodiment of the disclosure, on one hand, the plurality of photodetectors are arranged around the light-emitting component to detect the PPG signals, so that the PPG signals in a plurality of position directions can be obtained, the number of light-emitting units can be reduced, and the detection power consumption of the electronic device can be reduced; on the other hand, PPG signals in a plurality of position directions can be obtained, so that the problem that the detection result is inaccurate due to the difference of biological tissues or wearing habits of the user can be avoided; on the other hand, the PPG signals with better signal quality can be selected from the PPG signals in a plurality of position directions, so that the accuracy of the detection of the biological information of the user can be improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 schematically illustrates a schematic diagram of the generation of an oximetry wave in PPG rationale;
figure 2 schematically shows a schematic diagram of the hemoglobin absorption curve in the PPG basic principle;
fig. 3 schematically illustrates a structural diagram of an electronic device provided in an exemplary embodiment of the present disclosure;
fig. 4 schematically illustrates a structural diagram of another electronic device provided in an exemplary embodiment of the present disclosure;
fig. 5 schematically illustrates a structural diagram of another electronic device provided in an exemplary embodiment of the present disclosure;
fig. 6 schematically illustrates a structural schematic diagram of a multi-path processing circuit provided in an exemplary embodiment of the present disclosure;
fig. 7 schematically shows a flowchart of a biological information detection method provided in an exemplary embodiment of the present disclosure.
In the figure:
300. an electronic device; 310. a light emitting assembly; a light detector 320; 330. a processor; 340. a memory; 412. 512, 514, 516, a first light emitting unit; 414. a second light emitting unit; 610. a multi-path processing circuit; 612. a channel selection unit; 614. a signal processing unit.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said," and "at least one" are used to indicate the presence of one or more elements/components/parts/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and are not limiting on the number of their objects.
First, the basic principle of the exemplary embodiment of the present disclosure is explained with reference to fig. 1 and 2. Fig. 1 schematically illustrates a schematic diagram of the generation of an oximetry wave in PPG rationale; fig. 2 schematically shows a schematic diagram of the hemoglobin absorption curve in the PPG basic principle.
Referring to fig. 1, when light is applied to a human body part such as a wrist or finger tissue, various tissue components absorb the light so that the intensity of the light after the light is applied is reduced. Wherein skin, muscle, bone, vein are non-pulsating tissue components, and the light absorption is substantially constant, e.g. the optical path length is kept constant d; the artery is pulsating, the blood volume of the artery changes periodically along with the pulsation of the heart, and when the heart contracts, the heart shoots blood and the blood volume is increased; when the heart relaxes, the heart returns blood and the blood volume is reduced; thus, the absorption of light by the pulsating part of the artery will change due to the change in blood volume, and as can be seen from FIG. 1, the light intensity IminAnd ImaxFor example, there is an optical path deviation Δ d. Just because the absorption of light by the artery changes and the absorption of light by other tissues is basically unchanged, when the light beam irradiates a human body part such as a wrist or a finger, reflected light changes periodically in intensity along with the pulsation of the artery, so that a plethysmographic wave, namely a PPG signal can be obtained, and biological information of a user, such as heart rate or blood oxygen saturation and the like, can be detected through the PPG signal. Below, is combined with and attached toThe figure illustrates in detail the detection of the biometric information of the user by means of the PPG signal.
Taking the heart rate as an example, referring to fig. 1, the number of peaks in a certain time is obtained by filtering the original PPG signal, and the heart rate value of the user can be calculated according to the number of peaks.
Taking the blood oxygen saturation as an example, the blood oxygen saturation refers to the percentage of oxyhemoglobin HbO2 in human blood to the total bindable hemoglobin (Hb), i.e. the concentration of blood oxygen in blood, and can be determined by the following formula (1).
Wherein, SaO2 is the blood oxygen saturation, HbO2 is oxygenated hemoglobin, and Hb is hemoglobin.
According to the lambert beer's law two-wavelength type oxyhemoglobin saturation measurement principle, the key of oxyhemoglobin saturation extraction is to obtain PPG signals under two specific wavelength light sources. Referring to fig. 2, the oxyhemoglobin HbO2 and the hemoglobin Hb are present in a certain ratio in the blood. FIG. 2 shows the light absorption characteristics of oxyhemoglobin HbO2 and hemoglobin Hb at wavelengths of 600 to 1000nm, and it can be seen from FIG. 2 that the absorption coefficient of hemoglobin Hb is higher for light having a wavelength of 600 to 805nm, and the absorption coefficient of oxyhemoglobin HbO2 is higher for light having a wavelength of 805 to 1000 nm. Therefore, the HbO of the human body part can be detected by using the red light (600-805 nm) and the near infrared light (805-1000 nm) respectively2And a PPG signal of Hb, and then obtaining HbO from the PPG signal2The ratio corresponding to Hb, and thus the blood oxygen saturation of the human body part is obtained.
For example, if the human body is a wrist or a finger, two light beams with different wavelengths, namely, red light 660nm and infrared light 940nm, are used, and when the light passes through the wrist or the finger, due to HbO of the two light beams2Different from Hb absorption, the corresponding HbO is obtained2And a PPG signal of Hb, HbO being obtained from the PPG signal2The ratio corresponding to Hb, according toThe ratio yields the wrist or finger blood oxygen saturation.
It should be noted that although the heart rate and the blood oxygen saturation are taken as examples for illustration, it should be understood by those skilled in the art that the embodiments of the present disclosure can also be used for detecting other biological information obtained by PPG signals, such as blood glucose or blood pressure, and the like, and the same is within the protection scope of the present disclosure.
Fig. 3 schematically illustrates a structural diagram of an electronic device provided in an exemplary embodiment of the present disclosure.
Referring to fig. 3, the electronic device 300 includes: a light emitting assembly 310, a plurality of light detectors 320, a processor 330, and a memory 340. The electronic device 300 will be described in detail with reference to the drawings.
The light emitting assembly 310 may include one or more light emitting units. In the following, the light emitting assembly 310 is described as including the first light emitting unit and/or the second light emitting unit, and the number of the first light emitting unit and the second light emitting unit in the embodiment of the present disclosure may be one or two, and may also be a suitable number, such as 3 or 4, and the like, which is also within the protection scope of the present disclosure.
The plurality of photo detectors 320 are configured to detect a reflected light signal emitted by the light emitting assembly 310 and reflected by a target portion of the user, such as a wrist, and convert the detected reflected light signal into an electrical signal, i.e., a PPG signal.
The processor 330 is electrically connected to the plurality of light detectors 320, and may process PPG signals generated by the light detectors 320. The processor 330 may also process instructions for execution within the electronic device 300, including instructions stored in the memory 340 or instructions input on an external input/output device.
The memory 340 stores instructions executable by the at least one processor 330, and the memory 340, as a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions/modules in the biometric information detection method in the embodiments of the present application. The processor 330 executes various functional applications and data processing by executing non-transitory software programs, instructions, and modules stored in the memory 340.
It should be noted that the electronic apparatus 300 may be a wrist wearable device (e.g., a watch, a bracelet-type device, a band-type device, a bracelet-type device), however, it should be understood by those skilled in the art that the electronic apparatus 300 of the disclosed embodiment may also include various electronic devices capable of obtaining biological information of a user when the user approaches by installing a PPG optical sensor module. For example, the electronic device 300 of the disclosed embodiments may be implemented as a head-mounted device (e.g., a smart hat, a smart helmet), a garment-type device (e.g., a smart garment, gloves, footwear), a band-type device with biometric sensors (e.g., an armband, a smart ring), and so on.
With continued reference to fig. 3, in the example embodiment of fig. 3, where the plurality of light detectors 320 are disposed around light emitting assembly 310, light emitting assembly 310 may include a first light emitting unit for emitting a first light signal for generating a first PPG signal, the first PPG signal being a PPG signal generated via reflection from a target site, such as a wrist or finger, of a user using electronic device 300; the photodetector 320 is configured to receive a first reflected light signal generated by the first light signal being reflected by the target region of the user, and generate a first PPG signal corresponding to the first reflected light signal; the processor 330 is configured to determine biological information of the user to be detected, such as heart rate or blood oxygen saturation, from the first PPG signal generated by the at least one light detector 320.
According to the technical solution in the example embodiment of fig. 3, on one hand, by arranging a plurality of light detectors around the light emitting assembly to detect the PPG signals, not only the PPG signals in a plurality of position directions can be obtained, but also the number of light emitting units can be reduced, and the detection power consumption of the electronic device can be reduced; on the other hand, PPG signals in a plurality of position directions can be obtained, so that the problem that the detection result is inaccurate due to the difference of biological tissues or wearing habits of the user can be avoided; on the other hand, the PPG signals with better signal quality can be selected from the PPG signals in a plurality of position directions, so that the accuracy of the detection of the biological information of the user can be improved.
The electronic device in fig. 3 will be described in detail with reference to several embodiments.
The first embodiment is as follows:
in one embodiment, the first light emitting unit of the light emitting assembly 310 includes an LED, which may be a green LED, and the light detector 320 is a light sensitive sensor such as a photodiode. The light emitting assembly 310 emits a first light signal through the green LED, and the light detector 320 receives a first reflected light signal generated by the first light signal being reflected by a target part of the user, such as a wrist, and converts the first reflected light signal into an electrical signal, i.e., a first PPG signal; the processor 330 determines the heart rate of the user to be detected from the first PPG signal generated by the at least one light detector 320, e.g. from the number of peaks in the first PPG signal.
Example two:
in the second embodiment, the first light emitting unit of the light emitting assembly 310 includes a red LED and an infrared LED, and the first light signal is emitted through the red LED and the infrared LED, respectively, that is, the first light signal includes a red light signal and an infrared light signal, wherein the wavelength of the light signal of the red LED may be 660nm, and the wavelength of the light signal of the infrared LED is 940 nm.
The light detector 320 includes a red light detection unit and an infrared light detection unit, the red light detection unit is configured to receive a first reflected light signal generated by a first light signal emitted by a red light LED being reflected by a target portion of a user, such as a wrist, and generate a first PPG signal 1 corresponding to the first reflected light signal; the infrared light detection unit is used for receiving a first reflected light signal generated by reflecting a first light signal emitted by the infrared light LED through a target part of a user and generating a first PPG signal 2 corresponding to the first reflected light signal.
Further, the red light detecting unit of the light detector 320 may include a first filter device for filtering the red light so that the red light detecting unit receives only the red light; the infrared light detecting unit of the light detector 320 includes a second filter device for filtering the red light so that the infrared light detecting unit receives only the infrared light. By arranging the first filter device and the second filter device, the accuracy of optical signal detection can be improved.
Further, in an example embodiment, the processor 330 selects at least one target light detector from the plurality of light detectors 320 according to a signal strength magnitude of PPG signals generated by the plurality of light detectors 320; and determining biological information of the user to be detected according to the PPG signal generated by the target light detector. For example, the processor 330 selects one or two optical detectors corresponding to the signals from the optical detectors 320 as a target optical detector according to the signal intensity, and determines the heart rate and/or the blood oxygen saturation of the user to be detected according to the PPG signals generated by the target optical detector.
In the above exemplary embodiment, the PPG signals with better signal quality are selected from the PPG signals in multiple position directions, so that the problem of inaccurate detection results caused by differences in biological tissues or wearing habits of the user can be avoided, the accuracy of biological information detection of the user is improved, and the robustness of biological information detection is increased.
Further, in the present exemplary embodiment, after the target photodetector is selected from the plurality of photodetectors 320, the processor 330 stops the photodetectors other than the target photodetector from receiving the reflected light signal. For example, when the detection starts, the signal of each photodetector 320 is acquired within a predetermined time, for example, 3s, the 1-channel or 2-channel signal with better signal quality is selected for biological information detection, and the signal reception and processing of the photodetector 320 corresponding to the other channel signal are stopped. By stopping the signal reception and processing of the photodetector with poor signal quality, the detection power consumption of the electronic device can be further reduced without affecting the biological information detection result.
Fig. 4 schematically illustrates a structural diagram of another electronic device provided in an exemplary embodiment of the present disclosure.
Referring to fig. 4, the electronic device 400 includes: a light emitting assembly 310, 4 light detectors 320, and a processor 330 (not shown). Wherein the light emitting assembly 310 comprises a first light emitting unit 412 for emitting a first light signal for generating a first PPG signal; a second light-emitting unit 414, the second light-emitting unit 414 being configured to emit a second light signal, the second light signal being configured to form a second PPG signal; the first and second PPG signals are PPG signals generated via reflection from a target site, such as a wrist or finger, of a user using the electronic device 300.
Around the light emitting assembly 310, 4 light detectors 320 are arranged, the light detectors 320 being configured to receive a first reflected light signal and a second reflected light signal generated by the first light signal and the second light signal being reflected by a target area of the user, such as a wrist, and to generate a first PPG signal and a second PPG signal corresponding to the first reflected light signal and the second mode light signal, respectively.
According to the technical solution in the example embodiment of fig. 4, on one hand, by arranging a plurality of light detectors around the light emitting assembly to detect the PPG signals, not only the PPG signals in a plurality of position directions can be obtained, but also the number of light emitting units can be reduced, and the detection power consumption of the electronic device can be reduced; on the other hand, PPG signals in a plurality of position directions can be obtained, so that the problem that the detection result is inaccurate due to the difference of biological tissues or wearing habits of the user can be avoided; on the other hand, the PPG signals with better signal quality can be selected from the PPG signals in a plurality of position directions, so that the accuracy of the detection of the biological information of the user can be improved.
Fig. 5 schematically illustrates a structural diagram of another electronic device provided in an exemplary embodiment of the present disclosure.
Referring to fig. 5, the electronic device 500 may be a wrist wearable watch, and the electronic device 500 includes: a light emitting assembly 310, 8 light detectors 320, and a processor 330 (not shown). Wherein the light emitting assembly 310 comprises a first light emitting unit 512, a first light emitting unit 514 and a first light emitting unit 516, the first light emitting unit 512, 514, 516 is configured to emit a first light signal for generating a first PPG signal, the first PPG signal being a PPG signal generated by reflection from a target part of a user using the electronic device 300, such as a wrist or a finger.
Around the light emitting assembly 310, 8 light detectors 320 are arranged, the light detectors 320 being configured to receive a first reflected light signal generated by reflection of the first light signal by a target part of the user, such as a wrist, and to generate a first PPG signal corresponding to the first reflected light signal.
The processor 330 determines the biological information of the user to be detected from the first PPG signal generated by the at least one light detector 320. For example, in the example embodiment of fig. 5, the first light emitting unit 512 is a red LED, the first light emitting unit 514 is an infrared LED, the two first light emitting units 516 are green LEDs, and the processor 330 determines the heart rate of the user to be detected according to the first PPG signal corresponding to the green LEDs generated by the at least one light detector 320; or processor 330 determines the blood oxygen saturation level of the user to be detected from the first PPG signals generated by at least one light detector 320 corresponding to the red and infrared LEDs.
According to the technical solution in the example embodiment of fig. 5, on one hand, by arranging a plurality of light detectors around the light emitting assembly to detect the PPG signals, not only the PPG signals in a plurality of position directions can be obtained, but also the number of light emitting units can be reduced, and the detection power consumption of the electronic device can be reduced; on the other hand, PPG signals in a plurality of position directions can be obtained, so that the problem that the detection result is inaccurate due to the difference of biological tissues or wearing habits of the user can be avoided; on the other hand, the PPG signals with better signal quality can be selected from the PPG signals in a plurality of position directions, so that the accuracy of the detection of the biological information of the user can be improved.
Furthermore, in the example embodiment of fig. 5, the processor 330 selects at least one target light detector from the plurality of light detectors 320 according to the signal strength magnitude of PPG signals generated by the plurality of light detectors 320; and determining biological information of the user to be detected according to the PPG signal generated by the target light detector. For example, the processor 330 selects one or two optical detectors corresponding to the signals from the optical detectors 320 as a target optical detector according to the signal intensity, and determines the heart rate and/or the blood oxygen saturation of the user to be detected according to the PPG signals generated by the target optical detector.
In the above exemplary embodiment, the PPG signals with better signal quality are selected from the PPG signals in multiple position directions, so that the problem of inaccurate detection results caused by differences in biological tissues or wearing habits of the user can be avoided, the accuracy of biological information detection of the user is improved, and the robustness of biological information detection is increased.
Further, in the present exemplary embodiment, after the target photodetector is selected from the plurality of photodetectors 320, the processor 330 stops the photodetectors other than the target photodetector from receiving the reflected light signal. For example, when the detection starts, the signal of each photodetector 320 is acquired within a predetermined time, for example, 3s, the 1-channel or 2-channel signal with better signal quality is selected for biological information detection, and the signal reception and processing of the photodetector 320 corresponding to the other channel signal are stopped. By stopping the signal reception and processing of the photodetector with poor signal quality, the detection power consumption of the electronic device can be further reduced without affecting the biological information detection result.
Further, in an example embodiment, the electronic device 500 further includes: and a multi-channel processing circuit, which is used for performing signal amplification processing on the PPG signals generated by the multiple optical detectors 320. Fig. 6 schematically shows a structural schematic diagram of a multi-path processing circuit provided in an exemplary embodiment of the present disclosure.
Referring to fig. 6, the multi-channel processing circuit 610 includes: a channel selection unit 612, where the channel selection unit 612 is configured to select PPG signals generated by a predetermined number of photodetectors 320 of the plurality of photodetectors 320; and a signal processing unit 614 electrically connected to the channel selection unit 612, wherein the signal processing unit 614 is configured to perform signal amplification processing on the PPG signals generated by the predetermined number of photodetectors. The processor 330 determines the biological information of the user to be detected according to the amplified PPG signal.
Fig. 7 schematically shows a flowchart of a biological information detection method provided in an exemplary embodiment of the present disclosure. The biological information detection method may be applied to the electronic device 300, and is performed by the processor 330 of the electronic device 300. The electronic device 300 further includes: a light emitting assembly 310, the light emitting assembly 310 comprising a first light emitting unit for emitting a first light signal, the first light signal for generating a first PPG signal; a plurality of light detectors 320, the plurality of light detectors 320 disposed around the light emitting assembly 310. Next, the biological information detection method in the exemplary embodiment is described in detail with reference to fig. 7.
Referring to fig. 7, in step S710, a first reflected light signal formed by reflection of the first light signal is received by a photodetector, and a first PPG signal corresponding to the first reflected light signal is generated.
In some example embodiments, the first light emitting unit of the light emitting assembly 310 includes one LED, which may be a green LED, and the light detector is a light sensitive sensor such as a photodiode. Light emitting assembly 310 emits a first optical signal via the green LED, applies a reverse bias voltage to optical detector 320, controls optical detector 320 to receive a first reflected optical signal generated by the first optical signal reflecting off a target site of the user, such as a wrist, and converts the first reflected optical signal into an electrical signal, i.e., a first PPG signal.
In other exemplary embodiments, the first light emitting unit of the light emitting assembly 310 includes one red LED and one infrared LED, and the first light signal is emitted through the red LED and the infrared LED, respectively, i.e., the first light signal includes a red light signal and an infrared light signal, wherein the wavelength of the light signal of the red LED may be 660nm, and the wavelength of the light signal of the infrared LED is 940 nm. The light detector 320 includes a red light detection unit and an infrared light detection unit, and controls the red light detection unit to receive a first reflected light signal generated by a first light signal emitted by a red light LED being reflected by a target part of a user, such as a wrist, and generate a first PPG signal 1 corresponding to the first reflected light signal; the control infrared light detection unit receives a first reflected light signal generated by reflecting a first light signal emitted by the infrared light LED through a target part of a user, and generates a first PPG signal 2 corresponding to the first reflected light signal.
In step S720, biological information of the user to be detected is determined from the first PPG signal generated by the at least one light detector.
In some example embodiments, the processor 330 determines the heart rate of the user to be detected from the first PPG signal generated by the at least one light detector 320, e.g., from the number of peaks in the first PPG signal.
In other example embodiments, processor 330 determines the oxygen saturation level of the blood of the user to be detected from first PPG signal 1 and first PPG signal 2 generated by at least one light detector 320, e.g., processor 330 derives a ratio of HbO2 to Hb from first PPG signal 1 and first PPG signal 2, from which a oxygen saturation level of the blood of the target site of the user is derived.
According to the technical solution in the example embodiment of fig. 7, on one hand, by disposing a plurality of light detectors around the light emitting assembly to detect the PPG signals, not only the PPG signals in a plurality of position directions can be obtained, but also the number of light emitting units can be reduced, and the detection power consumption of the electronic device can be reduced; on the other hand, PPG signals in a plurality of position directions can be obtained, so that the problem that the detection result is inaccurate due to the difference of biological tissues or wearing habits of the user can be avoided; on the other hand, the PPG signals with better signal quality can be selected from the PPG signals in a plurality of position directions, so that the accuracy of the detection of the biological information of the user can be improved.
Further, in an example embodiment, the biological information includes oxygen saturation, and the light emitting assembly 310 further includes: a second light-emitting unit for emitting a second optical signal for forming a second PPG signal, the method further comprising: receiving, by the photodetector 320, a second reflected light signal formed by reflection of the second light signal, and generating a second PPG signal corresponding to the second reflected light signal; the oxygen saturation of the blood of the user to be detected is determined by the processor 330 from the first PPG signal and the second PPG signal generated by the at least one light detector 320.
Further, in an example embodiment, the method further comprises: selecting at least one target light detector from the plurality of light detectors 320 determined according to the signal strength magnitudes of the PPG signals generated by the plurality of light detectors 320; and determining the biological information to be detected according to the PPG signal generated by the target light detector. For example, the processor 330 selects one or two optical detectors corresponding to the signals from the optical detectors 320 as a target optical detector according to the signal intensity, and determines the heart rate and/or the blood oxygen saturation level of the user to be detected according to the PPG signals generated by the target optical detector.
In the above exemplary embodiment, the PPG signals with better signal quality are selected from the PPG signals in multiple position directions, so that the problem of inaccurate detection results caused by differences in biological tissues or wearing habits of the user can be avoided, the accuracy of biological information detection of the user is improved, and the robustness of biological information detection is increased.
Further, the method further comprises: after the target photodetector is selected from the plurality of photodetectors 320, the photodetectors other than the target photodetector are stopped from receiving the reflected light signal. For example, when the detection starts, the signal of each photodetector 320 is acquired within a predetermined time, for example, 3s, the 1-channel or 2-channel signal with better signal quality is selected for biological information detection, and the signal reception and processing of the photodetector 320 corresponding to the other channel signal are stopped. By stopping the signal reception and processing of the photodetector with poor signal quality, the detection power consumption of the electronic device can be further reduced without affecting the biological information detection result.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (14)
1. An electronic device, comprising:
a light emitting assembly comprising a first light emitting unit for emitting a first light signal for forming a first photoplethysmography, PPG, signal;
a plurality of photodetectors disposed around the light emitting assembly, the photodetectors configured to receive a first reflected light signal formed by reflection of the first light signal and generate the first PPG signal corresponding to the first reflected light signal;
a processor for determining biological information of a user to be detected from the first PPG signal generated by at least one of the light detectors.
2. The electronic device of claim 1, wherein the biological information includes oxygen saturation, the light emitting assembly further comprising:
a second light emitting unit to emit a second optical signal to form a second PPG signal;
the photodetector is further configured to receive a second reflected light signal formed by reflection of the second light signal, and generate the second PPG signal corresponding to the second reflected light signal;
the processor is further configured to determine an oxygen saturation level of blood of the user to be detected from the first PPG signal and the second PPG signal generated by the at least one light detector.
3. The electronic device of claim 2, wherein the first light-emitting unit comprises a red LED and the second light-emitting unit comprises an infrared LED.
4. The electronic device of claim 1, wherein the processor is further configured to:
selecting at least one target light detector from the plurality of light detectors according to a signal strength magnitude of PPG signals generated by the plurality of light detectors;
and determining biological information of the user to be detected according to the PPG signal generated by the target light detector.
5. The electronic device of claim 4, wherein the processor is further configured to:
stopping a photodetector other than the target photodetector from receiving the reflected light signal.
6. The electronic device of claim 1, further comprising:
a multi-channel processing circuit for performing signal amplification processing on the PPG signals generated by the plurality of photo-detectors.
7. The electronic device of claim 6, wherein the multi-channel processing circuit further comprises:
a channel selection unit for selecting PPG signals generated by a predetermined number of photodetectors in the plurality of photodetectors;
and the signal processing unit is electrically connected with the channel selection unit and is used for carrying out signal amplification processing on the PPG signals generated by the predetermined number of optical detectors.
8. The electronic device of any of claims 1-7, wherein the first light emitting unit further comprises a green LED.
9. The electronic device of any of claims 1-7, wherein the plurality of light detectors is 8 in number.
10. The electronic device of claim 8, wherein the electronic device is a wrist wearable device.
11. A biological information detection method is applied to an electronic device, and the electronic device comprises: a light emitting assembly comprising a first light emitting unit to emit a first light signal, the first light signal to generate a first PPG signal; a plurality of light detectors disposed around the light emitting assembly, the method comprising:
receiving, by the photodetector, a first reflected light signal formed by reflection of the first light signal and generating the first PPG signal corresponding to the first reflected light signal;
determining biological information of a user to be detected from the first PPG signal generated by at least one of the light detectors.
12. The method of claim 11, wherein the biological information includes oxygen saturation, the light assembly further comprising: a second light-emitting unit for emitting a second light signal for forming a second PPG signal, the method further comprising:
receiving, by the photodetector, a second reflected light signal formed by reflection of the second light signal, and generating the second PPG signal corresponding to the second reflected light signal;
determining the blood oxygen saturation of the user to be detected from the first and second PPG signals generated by the at least one light detector.
13. The method according to claim 11 or 12, characterized in that the method further comprises:
selecting at least one target light detector from the plurality of light detectors as determined by the signal strength magnitudes of the PPG signals generated by the plurality of light detectors;
and determining biological information of the user to be detected according to the PPG signal generated by the target light detector.
14. The method of claim 13, further comprising:
stopping a photodetector other than the target photodetector from receiving the reflected light signal.
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