Wearable device and wearing state detection method

Abstract

A wearable device includes a first light emitter for emitting light of at least one color; a first light sensor for receiving the light of the at least one color; a second light emitter for emitting a laser, which can be a vertical cavity surface laser emitter light-emitting element; a second light sensor for detecting the laser emitted by the second light emitter; and a processor connected to the first light emitter, the first light sensor, the second light emitter, and the second light sensor, and determining the wearing state of the wearable device according to the light signals detected by the first light sensor and the second light sensor. The above wearable device can detect the tightness of the user's wearing and remind the user to wear comfortably when the wearing is too loose.

Description

Technical Field

[0001] This application relates to the technical field of electronic devices, and in particular, to a wearable device supporting wearing detection. Background Art

[0002] Many current wearable devices support the wearing detection function. There are mainly two ways for wearing detection of wearable devices. One is to use the infrared (IR) light source and photodiode (PD) module used for measuring heart rate for wearing detection. The other is to add a capacitance sensor on the basis of the IR light source and PD module used in the first way to achieve wearing detection. Among them, using the IR light source and PD module solution used for measuring heart rate to achieve the wearing detection function, the material cannot be accurately distinguished in the non-wearing state, and the wearing state will be misjudged in the loose wearing state, which becomes a key factor affecting the user experience. Further adding a capacitance sensor to achieve the wearing detection function can effectively improve the accuracy of material discrimination in the non-wearing state, but there is no obvious improvement in the wearing experience for some materials with a dielectric constant close to that of the human body and in the loose wearing state. Moreover, the wearable device is small in size and limited in stacking space, and the capacitance sensor is easily affected by parasitic capacitance. All of the above become key factors affecting the user experience.

[0003] As users' requirements for experiences such as measuring heart rate, blood pressure, and electrocardiogram on wearable devices are gradually increasing, a wearing detection solution with low power consumption and high reliability is increasingly becoming the main demand of users. Summary of the Invention

[0004] The embodiments of this application provide a wearable device and a wearing state detection method, which will not significantly increase the power consumption of the system and can effectively detect the wearing state of the wearable device to improve the accuracy of measuring physiological data such as heart rate.

[0005] To achieve the above object, the following technical solutions are adopted in the embodiments of this application:

[0006] In a first aspect, a wearable device is provided, including: a first light emitter for emitting light of at least one color; a first light sensor for receiving the light of at least one color; a second light emitter, where the second light emitter is a vertical cavity surface emitting laser (VCSEL) light emitting element for emitting laser light; a second light sensor for detecting the laser light emitted by the second light emitter; and a processor connected to the first light emitter, the first light sensor, the second light emitter, and the second light sensor, and determining the wearing state of the wearable device according to the light signals detected by the first light sensor and the second light sensor, where the wearing state reflects whether the user has worn the wearable device and the tightness of the wearing, solving the problems of high misrecognition rate in the loose wearing state, susceptibility to the environment, and high power consumption in the past, thereby further optimizing the experience of measuring physiological data such as heart rate, blood pressure, and electrocardiogram of the wearable device and improving the measurement accuracy.

[0007] As an optional embodiment, the wearable device includes at least one second light emitter and at least four of the second light sensors, and the at least four second light sensors are uniformly arranged around the second light emitter, and the second light sensors are arranged between the second light emitter and the first light sensor. Uniformly arranging at least four second light sensors around the second light emitter can cover at least the laser detection in the up, down, left, and right four directions, improving the accuracy of the wearing state detection.

[0008] As an optional embodiment, the wearable device includes four of the first light sensors, and the four first light sensors are arranged in one-to-one correspondence with four of the at least four second light sensors. With this arrangement, it is possible to detect the laser light leaking in the up, down, left, and right four directions and determine which direction is worn loosely, improving the accuracy of the wearing state detection.

[0009] As an optional embodiment, the wearable device includes eight of the first light sensors and four of the second light sensors, and the first light sensors are uniformly arranged around the second light emitter and the second light sensors, and four of the eight first light sensors are arranged in one-to-one correspondence with the four second light sensors. With this arrangement, it is possible to more comprehensively detect the laser light leaking in eight directions, finely judge the wearing tightness, and improve the accuracy of the wearing state detection.

[0010] As an optional embodiment, when the number of first light sensors receiving the laser light is 0 and the number of second light sensors receiving the laser light ≥ 1, the processor determines that the wearing state of the wearable device is comfortable wearing; when the number of first light sensors receiving the laser light ≥ 1 and the number of second light sensors receiving the laser light ≥ 1, the processor determines that the wearing state of the wearable device is loose wearing.

[0011] As an alternative embodiment, when the number of the first optical sensors that receive laser is 0, and the number of the second optical sensors that receive laser is ≥2, the processor determines that the wearing state of the wearable device is comfortable wearing; when the number of the first optical sensors that receive the laser is ≥1, and the number of the second optical sensors that receive the laser is ≥1, the processor determines that the wearing state of the wearable device is loose wearing.

[0012] As an alternative embodiment, the wearable device further includes a display screen for displaying the wearing state determined by the processor, so that the user can view and understand the wearing state of the wearable device.

[0013] As an alternative embodiment, the wearable device further includes a prompter for prompting the user when the wearing state of the wearable device is loose wearing.

[0014] As an alternative embodiment, the wearable device includes a capacitance sensor for detecting the contact capacitance and sending the detected capacitance value to the processor; the processor determines the wearing state of the wearable device according to the optical signals detected by the first optical sensor and the second optical sensor, and the capacitance value. By adding a capacitance sensor to first detect whether the user wears the wearable device, and then detecting the wearing tightness by VCSEL after wearing, it is realized that the VCSEL reflection feature detection is mainly enabled in the loose wearing scenario, so that the power consumption of the system will not be significantly increased.

[0015] As an alternative embodiment, the first light emitter is used to emit infrared light; the first optical sensor is used to detect the reflected infrared light and send the detected infrared light signal to the processor; the processor determines the wearing state of the wearable device according to the laser signals detected by the first optical sensor and the second optical sensor, the infrared light signal detected by the first optical sensor, and the capacitance value. By first detecting whether the user wears the wearable device through the IR reflection feature, and then detecting the wearing tightness by VCSEL after wearing, it is realized that the VCSEL reflection feature detection is mainly enabled in the loose wearing scenario, and the power consumption of the system will not be significantly increased.

[0016] As an alternative embodiment, the first light emitter and the first optical sensor share the light emitter and the optical sensor in the PPG module, and the second light emitter is located at the center of the PPG module. Utilizing the existing PPG module for light transmission and detection can reduce the manufacturing cost and save the stacking space.

[0017] As an alternative embodiment, a light-shielding wall is provided between the first light emitter and the first light sensor, between the second light emitter and the second light emitter, and / or between the second light sensor and the first light emitter, so as to prevent light leakage and avoid light interference with each other.

[0018] In a second aspect, a method for detecting a wearing state is provided. The method is applied to the wearable device of the first aspect, and the method includes: the second light emitter emits a laser, and the second light emitter is a vertical cavity surface emitting laser (VCSEL) light-emitting element; the first light sensor and the second light sensor detect the reflected laser; and the wearing state of the wearable device is determined according to the laser signals detected by the first light sensor and the second light sensor. By measuring the increased photocurrent on the first light sensor and the second light sensor, the user's wearing state can be judged more accurately, thereby improving the accuracy of detecting physiological data such as heart rate, blood pressure, and electrocardiogram.

[0019] As an alternative embodiment, before the second light emitter emits a laser, the method further includes: the first light emitter emits infrared light; the first light sensor receives the infrared light; the wearing state of the wearable device is determined according to the infrared light signal received by the first light sensor; when the wearing state of the wearable device is worn, the second light emitter emits a laser; the first light sensor and the second light sensor detect the reflected laser; and the wearing state of the wearable device is determined according to the laser signals detected by the first light sensor and the second light sensor. At this time, the IR reflection feature is used to first detect whether the user wears the wearable device, and after wearing, the VCSEL is used to detect the wearing tightness, so that the VCSEL reflection feature detection is mainly enabled in the loose wearing scenario, without significantly increasing the power consumption of the system.

[0020] As an alternative embodiment, the wearable device includes a capacitance sensor for detecting the contact capacitance. Before the second light emitter emits a laser, the method further includes: determining the wearing state of the wearable device according to the contact capacitance detected by the capacitance sensor; when the wearing state of the wearable device is worn, the second light emitter emits a laser; the first light sensor and the second light sensor detect the reflected laser; and the wearing state of the wearable device is determined according to the laser signals detected by the first light sensor and the second light sensor. At this time, the capacitance sensor is used to first detect whether the user wears the wearable device, and after wearing, the VCSEL is used to detect the wearing tightness, so that the VCSEL reflection feature detection is mainly enabled in the loose wearing scenario, without significantly increasing the power consumption of the system.

[0021] As an alternative embodiment, determining the wearing state of the wearable device according to the laser signals detected by the first optical sensor and the second optical sensor specifically includes: when the number of the first optical sensors receiving the laser is 0 and the number of the second optical sensors receiving the laser is ≥1, determining that the wearing state of the wearable device is comfortable wearing; when the number of the first optical sensors receiving the laser is ≥1 and the number of the second optical sensors receiving the laser is ≥1, determining that the wearing state of the wearable device is loose wearing.

[0022] As an alternative embodiment, determining the wearing state of the wearable device according to the laser signals detected by the first optical sensor and the second optical sensor specifically includes:

[0023] When the number of the first optical sensors receiving the laser is 0 and the number of the second optical sensors receiving the laser is ≥2, determining that the wearing state of the wearable device is comfortable wearing; when the number of the first optical sensors receiving the laser is ≥1 and the number of the second optical sensors receiving the laser is ≥1, determining that the wearing state of the wearable device is loose wearing.

[0024] As an alternative embodiment, determining the wearing state of the wearable device according to the laser signals detected by the first optical sensor and the second optical sensor specifically includes: determining the wearing state of the wearable device according to the number of the first optical sensors detecting the laser and the number of the second optical sensors detecting the laser; when the wearing state of the wearable device is not loose wearing, further determining the wearing state of the wearable device according to the infrared light signal received by the first optical sensor, the contact capacitance detected by the capacitance sensor, the number of the first optical sensors detecting the laser, and the number of the second optical sensors detecting the laser. Through comprehensive judgment of the detection results of the contact capacitance, IR reflection characteristics, and VCSEL reflection characteristics, the accuracy of wearing state detection can be further improved.

[0025] As an alternative embodiment, when the wearing state of the wearable device is worn, the method further includes: the first light emitter emits light of at least one color; the first optical sensor receives the light of at least one color; determining the wearing state of the wearable device according to the light signals of at least one color received by the first optical sensor. By adding a living body detection, the accuracy of wearing state judgment can be further improved.

[0026] As an alternative embodiment, the method further includes: when the wearing state of the wearable device is comfortable wearing, displaying the wearing state.

[0027] As an alternative embodiment, the method further includes: when the wearing state of the wearable device is loose, displaying a first prompt message for prompting the user that the current wearing is too loose.

[0028] In a third aspect, a computer-readable storage medium is provided. A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the method described in the second aspect above is implemented.

[0029] In a fourth aspect, a computer program product containing instructions is provided. When the instructions of the computer program product run on a computer, the computer is caused to execute the method described in the second aspect above. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of a wearable device provided by an embodiment of the present application;

[0031] Figure 2 is a schematic structural diagram of a wristband provided by an embodiment of the present application;

[0032] Figure 3 is a top view of an implementation manner of a smart watch provided by an embodiment of the present application;

[0033] Figure 4 is Figure 3 a bottom view of the shown implementation manner of the smart watch;

[0034] Figure 5A is Figure 4 a cross-sectional view of the shown smart watch worn comfortably on the user's wrist along line A-A;

[0035] Figure 5B is Figure 4 a cross-sectional view of the shown smart watch worn loosely on the user's wrist along line A-A;

[0036] Figure 6 is Figure 5A an enlarged schematic view of the structure at B in;

[0037] Figure 7 is Figure 3 a bottom view of another implementation manner of the shown smart watch;

[0038] Figure 8A is Figure 7 a cross-sectional view of the shown smart watch worn comfortably on the user's wrist along line C-C;

[0039] Figure 8B is Figure 7 a cross-sectional view of the shown smart watch worn loosely on the user's wrist along line C-C;

[0040] Figure 9 is Figure 2 a schematic diagram of the wristband wearing state detection system shown in the figure;

[0041] Figure 10 is a schematic flow chart of a wearing state detection method provided by an embodiment of the present application;

[0042] Figures 11A - 11B is Figure 3 a set of interface schematic diagrams of the smart watch shown in the figure; Detailed implementation manners

[0043] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0044] Hereinafter, terms such as "first" and "second" are only used for convenience of description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0045] In addition, in the embodiments of the present application, "up", "down", "left", and "right" are not defined only with respect to the orientation of the components shown in the drawings. It should be understood that these directional terms may be relative concepts, which are used for relative description and clarification, and may change accordingly with the change of the orientation of the components shown in the drawings.

[0046] In the present application, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, "connection" may be a fixed connection, a detachable connection, or integrated; it may be directly connected or indirectly connected through an intermediate medium. In addition, the term "electrical connection" may be a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0047] As the functions of wearable devices become more and more numerous and perfect, wearable devices have increasingly become one of the essential electronic devices for people. Generally speaking, the working modes of wearable devices are different when they are in the wearing state and the non-wearing state. For example, when a wearable device is in the wearing state, all functions of the device can be supported, while when the wearable device is in the non-wearing state, some non-essential applications may be closed to reduce the power consumption of the wearable device and extend the standby time of the device. In this scenario, it is particularly important to identify whether the wearable device is in the wearing state or the non-wearing state.

[0048] Currently, the commonly used wearing detection method usually detects whether the wearable device is blocked by an object by measuring the IR light source and PD module used for heart rate measurement. The light source and PD module used for the above-mentioned heart rate measurement are also called Photoplethysmograph (PPG) modules (hereinafter referred to as PPG modules). The measurement principle of this method utilizes the reflection characteristics of light. When there is an obstruction in front, the reflectivity of light is high. Specifically, the IR light source emits infrared light, which is reflected by the skin and then received by the PD. Then, the information for wearing detection is obtained through processing and calculation by the processor of the wearable device. If an object obstruction is detected, it is considered that the wearable device is currently in a worn state. However, the above method's recognition of the wearable device being blocked by an object does not completely equal the wearable device being in a worn state. For example, when the user places the wearable device on other objects without wearing it, but the IR light source and PD module recognize an object obstruction, then an incorrect judgment will be made, which will in turn lead to errors in the working mode entered or applications enabled / closed by the wearable device based on the wearing state. That is to say, the above-mentioned wearing detection method cannot effectively distinguish the human skin from the surface of other material objects, thus resulting in incorrect judgments of wearing.

[0049] To solve the problem of incorrect judgment of the wearing state, combining a capacitive sensor with the above optical reflection scheme to detect whether the wearable device is worn by the human body can effectively improve the accuracy of wearing detection. Different substances have different dielectric constants, and the dielectric constant is one of the key factors determining the capacitance value of a parallel plate capacitor. Therefore, the capacitance value collected by the capacitive sensor can effectively distinguish most materials with dielectric constants different from that of the human body. However, the dielectric constants of metal and the human body are not very different, so incorrect wearing detections will still occur on metal.

[0050] Moreover, the optical reflection scheme has high requirements for the wearing posture of the wearable device. That is, even if the user wears the wearable device normally, but if the wearing is loose, in this loose wearing scenario, the optical path is easily interfered by external ambient light, etc., which will also lead to misjudgment.

[0051] Based on the above problems, the embodiments of the present application provide a wearable device supporting wear detection. By adding a Vertical-Cavity Surface-Emitting Laser (VCSEL) and a corresponding optical sensor, the corresponding optical sensor is used to detect the laser emitted by the VCSEL, and it is determined whether the user wears the wearable device based on the number and position of the optical sensors detecting the laser. In some embodiments of the present application, it is possible to correctly determine whether the user wears the wearable device only through the VCSEL and the optical sensors around it. Considering that the power consumption of the VCSEL is relatively large, in other embodiments, on the basis of the VCSEL and the optical sensors around it, a capacitance sensor or an existing PPG module can be further combined. On the basis that the capacitance sensor or the existing PPG module initially determines that the user has worn the wearable device, the VCSEL is then turned on to further determine whether the user wears the wearable device comfortably or loosely. The above VCSEL optical transmitter (hereinafter referred to as the second optical transmitter) and the optical sensor (hereinafter referred to as the second optical sensor) are placed in the middle of the PPG module, and the original optical sensors of the PPG module (hereinafter referred to as the first optical sensors) are arranged around the light source (hereinafter referred to as the first optical transmitter). Under normal and comfortable horizontal wearing, because the VCSEL has characteristics such as perfect beam quality and small divergence angle, after the beam emitted by the VCSEL is reflected by the skin, all the light is reflected back to the second optical sensors around the VCSEL to generate current, and no light will hit the first optical sensors around the PPG module to generate photocurrent; however, in the case of loose wearing by the user, because the PPG module will naturally form a certain angle with the arm, this will cause the light emitted by the VCSEL to be reflected by the skin and the light will not only fall on the second optical sensors around the VCSEL, but also on the first optical sensors of the PPG module. By measuring the increased photocurrent on the first optical sensors of the PPG module, it can be determined that the user's wearing posture is incorrect, and the user is reminded to wear it properly to improve the wearing experience, and further improve the detection accuracy of physiological data such as heart rate, blood pressure, and electrocardiogram.

[0052] The wearable device provided by the present application can be a smart watch, a smart bracelet, etc., which can be worn by the user on the wrist for detecting physiological data such as the user's electrocardiogram, blood pressure, blood oxygen saturation, electrocardiogram, etc.

[0053] Figure 1 It is a schematic structural diagram of a wearable device provided by an embodiment of the present application. As Figure 1As shown, the wearable device 100 includes a processor 110, a memory 120, a PPG module 140, and a capacitance sensor 160. The PPG module 140 includes a light emitter 141 and a light sensor 142. The processor 110, the memory 120, the PPG module 140, and the capacitance sensor 160 can be connected via a bus. Among them, the light emitter 141 and the light sensor 142 can each include one or more; the light emitter 141 is used to emit light or laser of at least one color. Among them, at least one of the light emitters 141 is a VCSEL for emitting laser, and the remaining light emitters 141 emit one or more colors of light, such as red light, green light, or infrared light; the light sensor 142 is used to detect the light or laser of the at least one color. The light sensor 142 is coupled to the processor 110 to send the detected light to the processor 110. For example, the light sensor 142 and the processor 110 are connected via a bus; the capacitance sensor 160 is used to detect a capacitance value and determine whether the wearable device is worn on the human skin surface based on the capacitance value. The capacitance sensor 160 is coupled to the processor 110 to send the detected capacitance value to the processor 110. For example, the capacitance sensor 160 and the processor 110 are connected via a bus; the memory 120 is used to store programs and data; the processor 110 is used to execute the programs stored in the memory 120 and read the data stored in the memory 120, and determine the wearing state of the wearable device based on one or more of the laser, infrared light detected by the light sensor 142, and the capacitance value detected by the capacitance sensor 160. Further, the processor 110 can also detect heart rate, blood pressure, blood oxygen saturation, and electrocardiogram in combination with the wearing state of the wearable device.

[0054] In an optional embodiment, the wearable device 100 may further include a transceiver 130, which is used to communicate with other electronic devices. The other electronic devices include a mobile phone or a tablet. For example, the wearable device 100 can send the determined wearing state to other electronic devices via the transceiver 130.

[0055] In another optional embodiment, the wearable device 100 may further include a prompter 150, which is connected to the processor 110 and is configured to generate prompt information according to an instruction of the processor, where the prompt information is used to prompt a wearing state of the wearable device. For example, the prompter 150 may be a display, and the prompt information may prompt the user of the wearing state of the wearable device in the form of graphics and text. For another example, the prompter 150 may also be a speaker, and the prompt information may prompt the user of the wearing state of the wearable device in the form of audio. For another example, the prompter 150 may be a buzzer, and the prompt information may prompt the user of the wearing state of the wearable device in the form of vibration. For another example, the prompter 150 is configured to prompt the user when the wearing state of the wearable device 100 is loose wearing.

[0056] The following takes the wristband 200 as an example of the wearable device 100 to further introduce the present application. Figure 2 FIG. is a schematic structural diagram of a wristband provided in an embodiment of the present application.

[0057] The wristband 200 may include a processor 210, an external memory interface 220, an internal memory 221, a universal serial bus (USB) interface 230, a charging management module 240, a power management module 241, a battery 242, an antenna 1, an antenna 2, a mobile communication module 250, a wireless communication module 260, an audio module 270, a speaker 270A, a receiver 270B, a microphone 270C, a headphone interface 270D, a sensor module 280, a button 290, a motor 291, an indicator 292, a camera 293, a display screen 294, and a subscriber identification module (SIM) card interface 295, etc. The sensor module 280 may include a capacitance sensor 280G, a PPG sensor 280H, etc.

[0058] It can be understood that the structure schematically shown in the embodiment of the present application does not constitute a specific limitation on the wristband 200. In other embodiments of the present application, the wristband 200 may include more or fewer components than those shown in the figure, or combine certain components, or split certain components, or have different component arrangements. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0059] The processor 210 may include one or more processing units. For example, the processor 210 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors. The controller can generate operation control signals according to the instruction operation code and timing signals to complete the control of fetching and executing instructions.

[0060] A memory may also be provided in the processor 210 for storing instructions and data. In some embodiments, the memory in the processor 210 is a cache memory. This memory can save the instructions or data that the processor 210 has just used or recycled. If the processor 210 needs to use the instruction or data again, it can directly call it from the memory. This avoids repeated accesses, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0061] The USB interface 230 is an interface that conforms to the USB standard specification. Specifically, it can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 230 can be used to connect a charger to charge the wristband 200, and can also be used to transfer data between the wristband 200 and peripheral devices. It can also be used to connect headphones to play audio through the headphones. This interface can also be used to connect other electronic devices, such as AR devices, etc.

[0062] The charging management module 240 is used to receive a charging input from a charger. Among them, the charger can be a wireless charger or a wired charger. In some embodiments of wired charging, the charging management module 240 can receive the charging input from a wired charger through the USB interface 230. In some embodiments of wireless charging, the charging management module 240 can receive the wireless charging input through the wireless charging coil of the wristband 200. While charging the battery 242, the charging management module 240 can also supply power to the electronic device through the power management module 241.

[0063] The power management module 241 is used to connect to the battery 242, the charging management module 240, and the processor 210. The power management module 241 receives inputs from the battery 242 and / or the charging management module 240, and supplies power to the processor 210, the internal memory 221, the display screen 294, the camera 293, the wireless communication module 260, etc. The power management module 241 can also be used to monitor parameters such as battery capacity, battery cycle count, and battery health status (leakage, impedance). In some other embodiments, the power management module 241 can also be disposed in the processor 210. In some other embodiments, the power management module 241 and the charging management module 240 can also be disposed in the same device.

[0064] The wireless communication function of the wristband 200 can be implemented by the antenna 1, the antenna 2, the mobile communication module 250, the wireless communication module 260, the modulation and demodulation processor, and the baseband processor, etc.

[0065] The antenna 1 and the antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in the electronic device 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization rate of the antennas. For example: the antenna 1 can be multiplexed as the diversity antenna of the wireless local area network. In some other embodiments, the antenna can be used in combination with a tuning switch.

[0066] The mobile communication module 250 can provide solutions for wireless communications including 2G / 3G / 4G / 5G, etc. applied to the wristband 200. The mobile communication module 250 can include at least one filter, switch, power amplifier, low noise amplifier (LNA), etc. The mobile communication module 250 can receive electromagnetic waves by the antenna 1, perform filtering, amplification, etc. on the received electromagnetic waves, and transmit them to the modulation and demodulation processor for demodulation. The mobile communication module 250 can also amplify the signal modulated by the modulation and demodulation processor and convert it into electromagnetic waves through the antenna 1 for radiation. In some embodiments, at least some functional modules of the mobile communication module 250 can be disposed in the processor 210. In some embodiments, at least some functional modules of the mobile communication module 250 and at least some modules of the processor 210 can be disposed in the same device.

[0067] The wireless communication module 260 can provide wireless communication solutions applied to the wristband 200, including wireless local area networks (WLANs) (such as wireless fidelity (Wi-Fi) networks), Bluetooth (BT), global navigation satellite systems (GNSS), frequency modulation (FM), near field communication (NFC), infrared technology (IR), etc. The wireless communication module 260 can be one or more devices integrating at least one communication processing module. The wireless communication module 260 receives electromagnetic waves via the antenna 2, performs frequency modulation and filtering processing on the electromagnetic wave signals, and sends the processed signals to the processor 210. The wireless communication module 260 can also receive the signals to be sent from the processor 210, perform frequency modulation and amplification on them, and convert them into electromagnetic waves through the antenna 2 and radiate them out.

[0068] In some embodiments, the antenna 1 of the wristband 200 is coupled to the mobile communication module 250, and the antenna 2 is coupled to the wireless communication module 260, so that the wristband 200 can communicate with the network and other devices through wireless communication technologies. The wireless communication technologies may include global system for mobile communications (GSM), general packet radio service (GPRS), code division multiple access (CDMA), wideband code division multiple access (WCDMA), time-division code division multiple access (TD-SCDMA), long term evolution (LTE), BT, GNSS, WLAN, NFC, FM, and / or IR technologies, etc. The GNSS may include global positioning system (GPS), global navigation satellite system (GLONASS), beidou navigation satellite system (BDS), quasi-zenith satellite system (QZSS), and / or satellite based augmentation systems (SBAS).

[0069] The wristband 200 implements the display function through the GPU, the display screen 294, and the application processor, etc. The GPU is a microprocessor for image processing, and is connected to the display screen 294 and the application processor. The GPU is used to execute mathematical and geometric calculations for graphics rendering. The processor 210 may include one or more GPUs, which execute program instructions to generate or change the display information.

[0070] The display screen 294 is used to display images, videos, etc. The display screen 294 includes a display panel. The display panel can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), a Miniled, a MicroLed, a Micro-oLed, a quantum dot light-emitting diode (QLED), etc. In some embodiments, the wristband 200 may include one or N display screens 294, where N is a positive integer greater than 1.

[0071] On the display screen 294, prompt information such as the wearing method and wearing status can be provided under the program control of the processor 210, and historical information in visual (numbers, tables, graphs) or audible (synthetic voice or tone) forms of physiological data such as the detected heart rate. As a non-limiting example, a visual curve graph can be displayed, which shows the heart rate calculated every 5 minutes during a previous fixed time interval (for example, 1 hour) or after the exercise time period has ended (as determined by an indication from the user). On the display screen 294, average heart rate information or statistical information of the heart rate during a previous time period or multiple time periods can also be provided under the control of the processor 210. As another example, on the display screen 294, the current heart rate value can be provided as a "real-time" heart rate value that is periodically (for example, every second) displayed to the user during the process of an ongoing exercise plan.

[0072] The wristband 200 can implement the shooting function through an ISP, a camera 293, a video codec, a GPU, a display screen 294, and an application processor, etc.

[0073] The ISP is used to process the data fed back by the camera 293. For example, when taking a photo, the shutter is opened, and the light passes through the lens and is transmitted to the camera photosensitive element. The optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converts it into an image visible to the naked eye. The ISP can also perform algorithm optimization on the noise, brightness, and skin color of the image. The ISP can also optimize parameters such as the exposure and color temperature of the shooting scene. In some embodiments, the ISP can be set in the camera 293.

[0074] The camera 293 is used to capture static images or videos. An object generates an optical image through the lens and projects it onto the photosensitive element. The photosensitive element can be a charge coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The photosensitive element converts the optical signal into an electrical signal, and then transmits the electrical signal to the ISP to be converted into a digital image signal. The ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into an image signal in standard formats such as RGB and YUV. In some embodiments, the wristband 200 may include one or N cameras 293, where N is a positive integer greater than 1.

[0075] The digital signal processor is used to process digital signals. In addition to processing digital image signals, it can also process other digital signals. For example, when the wristband 200 selects a frequency point, the digital signal processor is used to perform Fourier transform on the frequency point energy, etc.

[0076] The video codec is used to compress or decompress digital videos. The wristband 200 can support one or more video codecs. In this way, the wristband 200 can play or record videos in multiple encoding formats, such as: Moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, etc.

[0077] The NPU is a neural-network (NN) computing processor. By learning from the biological neural network structure, such as learning from the transmission mode between human brain neurons, it can quickly process the input information and can also continuously self-learn. Through the NPU, applications such as intelligent recognition of the wristband 200 can be realized, such as: image recognition, face recognition, speech recognition, text understanding, etc.

[0078] The external memory interface 220 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the wristband 200. The external memory card communicates with the processor 210 through the external memory interface 220 to achieve the data storage function. For example, files such as music and videos are saved in the external memory card.

[0079] The internal memory 221 can be used to store computer-executable program codes, and the executable program codes include instructions. The internal memory 221 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.). The data storage area can store data created during the use of the wristband 200 (such as audio data, phone book, etc.). In addition, the internal memory 221 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash storage (UFS), etc. The processor 210 executes various functional applications and data processing of the wristband 200 by running the instructions stored in the internal memory 221, and / or the instructions stored in the memory provided in the processor.

[0080] The wristband 200 can implement audio functions through the audio module 270, the speaker 270A, the receiver 270B, the microphone 270C, the headphone jack 270D, and the application processor, etc. Such as music playback, recording, etc.

[0081] The audio module 270 is used to convert digital audio information into an analog audio signal for output, and is also used to convert an analog audio input into a digital audio signal. The audio module 270 can also be used for encoding and decoding audio signals. In some embodiments, the audio module 270 can be disposed in the processor 210, or some functional modules of the audio module 270 can be disposed in the processor 210.

[0082] The speaker 270A, also known as the "loudspeaker", is used to convert an audio electrical signal into a sound signal. The wristband 200 can listen to music or hands-free calls through the speaker 270A.

[0083] The receiver 270B, also known as the "earpiece", is used to convert an audio electrical signal into a sound signal. When the wristband 200 answers a call or a voice message, the voice can be listened to by bringing the receiver 270B close to the human ear.

[0084] The microphone 270C, also known as the "microphone", "transmitter", is used to convert a sound signal into an electrical signal. When making a call or sending a voice message, the user can speak by bringing the mouth close to the microphone 270C to input the sound signal into the microphone 270C. The wristband 200 can be provided with at least one microphone 270C. In some other embodiments, the wristband 200 can be provided with two microphones 270C, which can not only collect sound signals but also implement a noise reduction function. In some other embodiments, the wristband 200 can also be provided with three, four or more microphones 270C to implement functions such as collecting sound signals, noise reduction, identifying the sound source, and implementing a directional recording function.

[0085] The headphone jack 270D is used to connect a wired headphone. The headphone jack 270D can be a USB interface 230, or a 3.5mm open mobile terminal platform (OMTP) standard interface, or a cellular telecommunications industry association of the USA (CTIA) standard interface.

[0086] The capacitive sensor 280G includes a parallel - plate capacitor with two plates, one of which is disposed on the surface of the wristband 200, and the other plate can be disposed on a flexible printed circuit (FPC). After the plate disposed on the surface of the wristband 200 contacts the user's skin or an object made of other materials, the capacitive sensor 280G can detect the change in the capacitance value, and determine whether the wristband 200 is worn according to the capacitance value. For example, it is detected whether the capacitance value of the capacitive sensor 280G is within a preset capacitance value range. When the preset capacitance value is within the preset capacitance value range, it is determined that the wristband 200 is worn. Since the capacitance value of the parallel - plate capacitor is mainly determined by the plate area and the plate spacing, and the spacing between the above two plates is small, in order to obtain a large capacitance input signal, generally, it is considered to design the plate area disposed on the surface of the wristband 200 to be large enough.

[0087] The PPG sensor 280H includes a light emitter and a light sensor. Measuring the heart rate through the PPG sensor 280H is based on the principle of light absorption by substances. The light emitter in the PPG sensor 280H irradiates the blood vessels of the skin, and the light sensor receives the light transmitted through the skin. Since blood with different volumes in the blood vessels absorbs light differently, during a heartbeat, the blood flow increases and the amount of light absorption will increase accordingly; during the interval between heartbeats, the blood flow decreases and the absorbed light will also decrease. Therefore, the heart rate can be measured based on the absorbance of the blood. In operation, the light emitter can transmit a light beam to the user's skin, and the light beam can be reflected by the user's skin and received by the light sensor. The light sensor can convert the light into an electrical signal indicating its intensity. The electrical signal can be in analog form and can be converted into digital form by an analog-to-digital converter. The digital signal from the analog-to-digital converter can be a time-domain PPG signal fed to the processor 210. The processor 210 can receive the digitized signals from the light sensor and can process these signals to provide a heart rate or wear status output signal to a memory, a visual display, an audible signaler, a touch screen, or other output indicators. In some embodiments, the PPG sensor 280H constitutes the PPG module for measuring physiological data such as the heart rate. The light emitter that emits the laser can be set at the central position of the PPG sensor 280H, and the light sensor that detects the reflected laser can be set around the light emitter that emits the laser. The above-mentioned light emitter and light sensor for measuring physiological data such as the heart rate are arranged on the periphery of the light sensor that detects the laser.

[0088] The wristband 200 can also be configured with other sensors such as a pressure sensor, a gyroscope, an acceleration sensor, an ambient light sensor, a barometer, a hygrometer, a thermometer, an infrared sensor, etc., which will not be elaborated here.

[0089] The button 290 includes a power-on button, a volume button, etc. The button 290 can be a mechanical button or a touch button. The wristband 200 can receive button inputs and generate key signal inputs related to the user settings and function control of the wristband 200.

[0090] The motor 291 can generate vibration prompts. The motor 291 can be used for incoming call vibration prompts or touch vibration feedback. For example, touch operations for different applications (such as taking pictures, playing audio, etc.) can correspond to different vibration feedback effects. For touch operations on different areas of the display screen 294, the motor 291 can also correspond to different vibration feedback effects. Different application scenarios (such as time reminder, receiving information, alarm clock, game, etc.) can also correspond to different vibration feedback effects. The touch vibration feedback effect can also support customization.

[0091] The indicator 292 can be an indicator light, which can be used to indicate the charging status, power change, or can also be used to indicate messages, missed calls, notifications, etc.

[0092] The SIM card interface 295 is used to connect the SIM card. The SIM card can be inserted into or removed from the SIM card interface 295 to achieve contact and separation from the wristband 200. The wristband 200 can support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 295 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 295 at the same time. The types of the multiple cards can be the same or different. The SIM card interface 295 can also be compatible with different types of SIM cards. The SIM card interface 295 can also be compatible with external memory cards. The wristband 200 interacts with the network through the SIM card to implement functions such as calls and data communication. In some embodiments, the wristband 200 uses an eSIM, that is, an embedded SIM card. The eSIM card can be embedded in the wristband 200 and cannot be separated from the wristband 200.

[0093] Taking a smartwatch as an example of the wristband 200, the present application will be further introduced below. Figure 3 It is a schematic structural diagram of a smartwatch provided by an embodiment of the present application. As Figure 3 shown, the smartwatch 300 includes a watch face 310 and a watch band 320. The front of the watch face 310 includes a display screen 311, which is used to display information, such as time, exercise status, wearer's body indicators, or wearing status, etc. As Figure 4 、 Figure 7 shown, a light emitter and a light sensor are provided on the back of the watch face 310. The smartwatch can be worn on the wrist through the watch band 320, and at this time, the back of the watch face 310 is attached to the skin.

[0094] As Figure 4As shown, the smartwatch includes one first light emitter 410 and four first light sensors 420. The light-emitting elements of the first light emitter 410 include a green LED 411, a red LED 412, and an infrared LED 413. The light emitter 410 can emit green light, red light, and infrared light through the green LED 411, the red LED 412, and the infrared LED 413 respectively. Among them, the LED is only an example of the light-emitting element, and the LED can also be other light-emitting components such as VCSEL. One or more of green light, red light, and infrared light can be sent in the direction of the wrist through the first light emitter 410. The reflected light after the light sent by the first light emitter 410 is reflected by the wrist is received by the first light sensor 420. Exemplarily, the above-mentioned first light emitter 410 and first light sensor 420 constitute the PPG module of the smartwatch to detect physiological data such as the heart rate and blood oxygen saturation of the user wearing the smartwatch.

[0095] Further referring to Figure 4 , the smartwatch further includes one second light emitter 430 and four second light sensors 440. The second light emitter 430 is a VCSEL light-emitting component and is disposed at the center position on the back of the watch face. The four second light sensors 440 are evenly disposed around the second light emitter 430, and each second light sensor 440 is disposed between the second light emitter 430 and the corresponding first light sensor 420. In this example, the four first light sensors 420 and the four second light sensors 440 are respectively disposed in one-to-one correspondence in the up, down, left, and right directions. As Figure 5A shown, in the scenario of comfortable wearing, the surface 500 of the plane where the back of the watch face contacts the human body is parallel. Because the VCSEL light-emitting component has characteristics such as perfect beam quality and small divergence angle, after the light beams 510 and 520 sent by the VCSEL are reflected by the skin, all the light is reflected back to the second light sensors 440 around the VCSEL. Refer to the light beams 530 and 540 shown in Figure 5A , so that a photocurrent is generated on the second light sensor 440, and no light is reflected to the first light sensor 420 to generate a photocurrent; as Figure 5B shown, when the user wears the smartwatch 300 loosely, because a certain angle will be formed between the back of the watch face and the arm, this will cause the light beams 510 and 520 sent by the VCSEL to be reflected by the skin and the light will not only be reflected to the second light sensors 440 around the VCSEL (refer to the light beam 530 shown in Figure 5B ), but also be reflected to the first light sensor 420 (refer to the light beam shown in Figure 5Bthe light beam shown in

[0096] Refer again to Figure 4 , the smartwatch further includes a capacitance sensor 450. The capacitance sensor 450 can be designed as a single ring as shown in Figure 4 , or can be designed as two symmetric rings, or can be designed as a rectangle or other shapes. The capacitance sensor 450 serves as one of the parallel-plate capacitor plates, and the other plate can be disposed on a flexible printed circuit (FPC). Since the capacitance value of the capacitance sensor 450 is mainly determined by the plate area and the plate spacing, generally, the area of the capacitance sensor 450 is considered to be designed large enough. By adding the capacitance sensor to first detect whether the user wears the wearable device, and then detecting the wearing tightness through the VCSEL after wearing, it is realized that the VCSEL reflection feature detection is mainly enabled in the loose-wearing scenario, so that the power consumption of the system will not be significantly increased.

[0097] Figure 6 is Figure 5A a partial enlarged structural schematic diagram at position B in Figure 6 . A light-shielding wall 460 is disposed between the second light sensor 440 and the first light emitter 410, mainly to prevent light leakage. Optionally, a light-shielding wall can also be disposed between the second light emitter 430 and the second light sensor 440, and between the first light emitter 410 and the first light sensor 420, to prevent light from directly entering the light sensor from the light source. As can be seen from

[0098] In another example, the first light emitter is 6 monochromatic light emitters, and the number of first light sensors is 8, which are evenly distributed on the back of the watch face to more accurately determine the wearing state of the smartwatch.

[0099] AsFigure 7 As shown, the smartwatch includes six first light emitters 710 and eight first light sensors 720. Each of the first light emitters 710 includes a light-emitting element, which can be one of a green LED, a red LED, and an infrared LED. Optionally, the six light emitters 710 can include two green LEDs, two red LEDs, and two infrared LEDs, arranged at intervals in sequence, respectively emitting green light, red light, and infrared light. In some embodiments, the number of the first light emitters 710 ≥ 6, and the embodiments of the present application do not limit this. Through the first light emitters 710, one or more of green light, red light, and infrared light can be sent in the direction of the wrist. Combining Figure 8A As shown, the reflected light of the light emitted by the first light emitter 710 after being reflected by the wrist is received by the first light sensor 720. Exemplarily, the above-mentioned first light emitters 710 and first light sensors 720 constitute the PPG module of the smartwatch to detect physiological data such as the heart rate and blood oxygen saturation of the user wearing the smartwatch.

[0100] Further referring to Figure 7 , the smartwatch further includes one second light emitter 730 and four second light sensors 740. The second light emitter 730 is a VCSEL light-emitting component, which is arranged at the center position on the back of the watch face. The four second light sensors 740 are evenly distributed around the second light emitter 730, between the second light emitter 730 and the first light emitters 710. In this example, the first light sensors 720 are evenly arranged around the second light emitter 730, the second light sensors 740, and the first light emitters 710. Four of the eight first light sensors 720 are respectively arranged in one-to-one correspondence with the four second light sensors 740 in the up, down, left, and right directions. As Figure 8A shown, in the scenario of comfortable wearing, the surface 500 of the plane where the back of the watch face contacts the human body is parallel. Because the VCSEL light-emitting component has characteristics such as perfect beam quality and small divergence angle, after the light beam emitted by the VCSEL is reflected by the skin, all the light is reflected back to the second light sensors 740 around the VCSEL, thereby generating a photocurrent, and no light is reflected to the first light sensors 720 to generate a photocurrent; as Figure 8B shown, when the user wears the smartwatch 300 loosely, because a certain angle a will be formed between the back of the watch face and the arm, this will cause the light beam emitted by the VCSEL to be reflected by the skin and the light will not only be reflected to the second light sensors 740 around the VCSEL, but also be reflected to the first light sensors 720; by measuring the increased photocurrent in the first light sensors 720, it can be determined that the user's wearing posture is incorrect, and the user can be reminded to wear correctly to improve the wearing experience and further improve the detection accuracy of the heart rate, blood oxygen saturation, etc.

[0101] Refer again to Figure 7 , the smart watch further includes a capacitance sensor 750. The capacitance sensor 750 can be designed as two symmetric rings as shown in Figure 7 , or can be designed as a single ring, a rectangle or other shapes. Its functions and effects are the same as those of the capacitance sensor 450 shown in Figure 4 , and will not be elaborated here.

[0102] In some embodiments, the number of the second light sensors 740 can be greater than or equal to 4, such as 5, 6, as long as it can cover the light information in the four directions of up, down, left and right of the second light emitter 730. Such a number setting can accurately detect the comfortable wearing state and avoid misjudgment of the state caused by shaking and the like. As shown in Figure 8A , in the comfortable wearing state (the back of the watch face corresponding to the PPG module is in contact with the skin, that is, in zero-distance contact), the back of the watch face equipped with the light emitter and the light sensor is parallel to the skin 500 of the user, and the distance between the first light emitter 710 and the skin 500 is d1. This distance d1 can include the thickness of the PPG sensor module itself, or the overall thickness after adding a light-transmitting lens on the PPG sensor module. Figure 8A The distance d2 between the second light sensor 740 and the second light emitter 730 is also shown, and the divergence angle of the second light emitter 730 is FOV. The relationship between d2 and d1 is: d2 = d1 * tan(FOV / 2). Exemplarily, in the comfortable wearing state, the distance d1 between the first light emitter 710 and the skin 500 is 1.45 mm, the divergence angle FOV of the second light emitter 730 is 17°, and the wavelength is 850 nm, then d2 = 0.22 mm. It can be seen that the second light sensor 740 is very close to the second light emitter 730, and the device structure composed of the second light emitter 730 and the second light sensor 740 is relatively compact, and will not increase the volume of the wearable device when multiplexing the PPG module, keeping the wearable device thin and light.

[0103] The number of the first light sensors 720 mainly depends on the accuracy requirements of the detection schemes for physiological data such as heart rate and blood oxygen saturation. To achieve full coverage of detecting the laser leaking in the four directions of up, down, left and right, 4 first light sensors can be set as shown in Figure 4 ; it can be understood that, in order to more accurately detect the laser leaking in each direction, the number of the first light sensors can be increased, and 8 first light sensors can be set as shown in Figure 7 . Therefore, in the embodiments of the present application, in order to take into account detecting the light emitted by the VCSEL when worn loosely, the number of the first light sensors 720 ≥ 4, and can be 4 or 8, such as the embodiments shown in Figure 4 and Figure 7 .

[0104] The following will further introduce the method and process of wearing state detection involved in the embodiments of the present application in conjunction with the attached drawings Figure 9 and Figure 10 to further introduce the method and process of wearing state detection involved in the embodiments of the present application.

[0105] Figure 9 is Figure 2 a schematic diagram of the architecture of the wearing state detection system inside the wristband shown in Figure 10 is a schematic diagram of the process of a wearing state detection method provided by an embodiment of the present application. This wearing state detection method can be applied to wearable devices with a structure of a light emitter, a light sensor, and a capacitance sensor arranged as Figure 4 or Figure 7 and the wearable device has a wearing state detection system architecture as shown in Figure 9 . Referring to Figure 10 , the method specifically includes the following steps:

[0106] S1010, perform wearing judgment by detecting the reflectivity of IR light.

[0107] In some embodiments, the IR light can reuse the light emitter in the PPG module. For example, Figure 4 the first light emitter 410 including the infrared LED 413 shown in Figure 7 , or the first light emitter 710 including the infrared LED shown in Figure 9 . The above infrared LEDs are in the normally open state, and the reflection signal of the infrared light is collected at a predetermined time interval. When there is an occlusion in front of the infrared LED, the reflectivity of the light increases. Combining

[0108] Figure 9 it can be seen that the PPG sensor 280H receives the drive signal sent by the processor 210, drives the infrared LED to emit light, and the infrared light is reflected by the skin and then received by a light sensor such as a photodiode. The reflected infrared light signal is input to the processor 210. The processor 210 performs signal amplification, analog-to-digital conversion and other processing through the Analog Front End (AFE), and then the DSP processes and calculates the reflectivity of the infrared light according to the relevant algorithm, and then judges whether the user wears the wearable device. If the judgment result obtained by the processor operation is yes, that is, it is judged by infrared light detection that the wearable device is in the worn state, then step S1012 is further executed; if the judgment result obtained by the processor operation is no, that is, it is judged by IR that the wearable device is not currently worn by the user, then step S1022 is executed to output the judgment result of "not worn". Optionally, a prompt message of "not worn" is displayed on the user interface (UI) of the display screen of the wearable device.

[0108] It can be understood that the IR light can be an infrared light emitter and an infrared light sensor independently provided in the wearable device instead of reusing the light emitter in the PPG module, as long as the change in the infrared light reflectance can be detected.

[0109] S1012, perform wearing judgment through a capacitance sensor.

[0110] In some embodiments, a capacitance sensor is used to measure the change in capacitance value after the wearable device comes into contact with the user. The capacitance sensor can be, for example, Figure 4 the capacitance sensor 450 as shown, or Figure 7 the capacitance sensor 750 as shown. The above capacitance sensors are in an always-on state. Combining Figure 9 it can be known that the capacitance sensor 280G collects capacitance signals at a preset sampling frequency and sends the detected capacitance signals to the processor. The processor uses a preset capacitance value or capacitance value range as the judgment criterion for whether the wearable device is in a worn state. If the judgment result of the processor is yes, that is, it is judged through capacitance detection that the wearable device is in a worn state, then step S1014 is further executed; if the judgment result of the processor is no, that is, it is judged through capacitance that the wearable device is not currently worn by the user, then step S1022 is executed to output the judgment result of "not worn". Optionally, a prompt message of "not worn" is displayed on the user interface (UI) of the display screen of the wearable device.

[0111] S1014, perform tightness wearing judgment through VCSEL.

[0112] Specifically, when after steps S1012 and S1014, that is, both the IR reflection characteristics and the capacitance value reflect that the user has worn the wearable device, the processor issues a drive signal to activate the PPG module, such as Figure 4 the second light emitter 430, the second light sensor 440, and the first light sensor 420 as shown, or Figure 7 the second light emitter 730, the second light sensor 740, and the first light sensor 720 as shown. The above second light emitter is a VCSEL light-emitting component. Combining Figure 9It can be known that after the PPG sensor 280H is started, it emits laser light, detects the photocurrent signals in the first photosensor and the second photosensor, and sends the photocurrent signals to the processor. After being processed by the AFE and operated by the DSP, the photocurrent signals can determine the number of the first photosensors that receive the laser light and the number of the second photosensors that receive the laser light. The processor makes a judgment on whether it is worn loosely based on the number of the first photosensors that receive the laser light and the number of the second photosensors that receive the laser light, that is, judges the wearing state of the wearable device. If the judgment result obtained by the processor's operation is yes, that is to say, it is judged through the VCSEL that the wearable device is in a loosely worn state, then step S1024 is further executed; if the judgment result obtained by the processor's operation is no, that is to say, it is judged through the VCSEL that the wearable device is not in a loosely worn state, then step S1016 is executed.

[0113] Among them, multiple situations of the wearing state of the wearable device can be set according to actual needs. For example, the wearing state at least includes being worn loosely and being worn comfortably. When the number of the second photosensors that receive the laser light ≥ 1 and the number of the first photosensors that receive the laser light ≥ 1, the wearing state of the wearable device is being worn loosely; when the number of the second photosensors that receive the laser light ≥ 2 and the number of the first photosensors that receive the laser light is 0, the wearing state of the wearable device is being worn comfortably. In another example, the algorithm threshold for being worn comfortably can be reduced. When the number of the second photosensors that receive the laser light ≥ 1 and the number of the first photosensors that receive the laser light is 0, the wearing state of the wearable device is being worn comfortably. Optionally, the wearing state can also include being worn too tightly, not worn, worn, etc. Alternatively, the wearing state can also include being worn correctly and not worn correctly, etc.

[0114] One or more of the above steps S1010, S1012, and S1014 can be selected for execution, and their execution order can also change accordingly. For example, steps S1010 and S1012 can be not executed, and the wearing state can also be judged only based on the VCSEL, including multiple wearing states such as being worn, not worn, being worn loosely, and being worn comfortably. Another example is that only step S1014 can be executed after only step S1010 is executed, or step S1010 can be not executed and only step S1014 can be executed after only step S1012 is executed. That is to say, the wearing state detection method provided by the embodiments of the present application can make a judgment on whether it is worn loosely based on the VCSEL on the basis of the IR wearing detection, or can obtain the judgment result based on the wearing detection of the capacitance sensor and the judgment of whether it is worn loosely by the VCSEL. Of course, compared with reusing the infrared LED in the PPG module to first detect whether it is worn or not and then make a judgment on whether it is worn loosely based on the VCSEL, the power consumption required for only turning on the VCSEL light-emitting element to detect all wearing states will be higher, but the detection result will also be more accurate.

[0115] S1016, perform a fusion judgment based on the wearing judgment results of IR, capacitance sensors, and VCSELs.

[0116] In the embodiments of the present application, based on steps S1010, step 1012, and step 1014, the processor can also use a fusion algorithm to determine the wearing state of the wearable device based on the wearing judgment results of the above steps. For example, different weighting coefficients can be set for the detected VCSEL reflection characteristics, IR light reflectivity, and contact capacitance, and the final wearing state is determined by multiplying these three detection results by their weighting coefficients. If the result of the processor's fusion judgment is yes, that is, it is determined through the detection results of IR, capacitance sensors, and VCSELs that the wearable device is in a worn state, then step S1018 is executed; if the result of the processor's fusion judgment is no, that is, the wearable device is not currently worn by the user, then step S1022 is executed to output a judgment result of "not worn".

[0117] S1018, perform a living body detection.

[0118] In the embodiments of the present application, a living body detection can also be performed when the result of the processor's fusion judgment in step S1016 is yes to ensure that the wearable device is worn by the user. For example, by multiplexing the light emitter in the PPG module to send green light, when the green light irradiates on a substance, part of it will be absorbed, and by detecting the reflected green light through a light sensor, it can be determined whether the substance is a living body. Specifically, the reflected light signal detected by the light sensor can be processed to obtain a direct current (DC) component and an alternating current (AC) component. If the DC component and / or the AC component are within a predetermined range, it can be determined that the substance is a living body, that is, the result of the living body detection is yes; if the obtained DC component and / or AC component are not within the predetermined range, it can be determined that the substance is not a living body, that is, the result of the living body detection is no. If the result of the living body detection is yes, then step S1020 is executed; if the result of the living body detection is no, then step S1022 is executed.

[0119] It can be understood that step S1018 is an optional and additional step for further improving the accuracy of wearing detection.

[0120] S1020, the processor determines that the current wearing state is a comfortable wearing.

[0121] If the result of the living body detection in step S1018 is yes, the processor determines the current wearing state of the wearable device based on one or more of the detection results in S1010, S1012, S1014, S1016, and S1018, and obtains a judgment result of comfortable wearing.

[0122] S1022, the processor determines that the current wearing state is not worn.

[0123] If the IR wearing determination result in step S1010 is No, or the capacitance sensor wearing determination result in step S1012 is No, or the determination result of the fusion determination through the IR, capacitance sensor, and VCSEL wearing determination results in step S1016 is No, or the living body detection result in step 1018 is No, the processor determines the current wearing state of the wearable device based on one or more of the detection results in S1010, S1012, S1016, and S1018 above, and obtains a determination result of not worn.

[0124] S1024, the processor determines that the current wearing state is loosely worn.

[0125] If the VCSEL loose / worn determination result in step S1014 is Yes, the processor obtains a determination result that the current wearing state of the wearable device is loosely worn based on this determination result.

[0126] In some embodiments, the processor may output the determination results obtained in S1020 - S1024 above to the display screen, and the user can know the current wearing state by viewing the display screen. The following takes the wearing states including not worn, comfortably worn, and loosely worn as an example for illustration.

[0127] After determining the wearing state of the wearable device, a prompt can be generated when the wearing state is abnormal. It can be prompted in the form of graphics and text. For example, in the form of a system notification, or in the interfaces of applications such as heart rate measurement and exercise measurement, it is provided that the wearing state does not meet the requirements. For example Figure 11A As shown, when the wearing state is too loose, the text information of the wearing state "Currently worn too loose, please maintain comfortable wearing 1101" can be displayed on the display screen of the wearable device. Further, after receiving the user's instruction, a guidance video or guidance graphics for correct wearing can also be displayed. When the state of the wristband does not meet the requirements, a vibration prompt can also be given, for example, by vibrating the buzzer. When the state of the wristband does not meet the requirements, a voice prompt can also be given, for example, by the speaker for voice prompt. Optionally, since the current wearing is too loose and the user fails to maintain comfortable wearing, the wearable device does not measure the heart rate and blood pressure at this time, so the detected physiological data values cannot be displayed.

[0128] After determining the wearing state of the wearable device, when the wearing state is normal, physiological data such as heart rate, blood pressure, blood oxygen saturation, and electrocardiogram can be directly detected, and the wearing state and physiological parameter detection values are displayed on the display screen of the wearable device. It can be prompted in the form of pictures and texts. For example, through the form of system notifications, or by providing the compliant wearing state and physiological detection values in the interfaces of applications such as heart rate measurement and exercise measurement. For example Figure 11B As shown, when the wearing state is normal, the text information of the wearing state "Wearing state: Comfortable wearing" 1102 can be displayed on the display screen of the wearable device, as well as the detected physiological data values "Resting heart rate: 65 beats per minute" 1103 and "Blood pressure: 60 / 90 mmHg" 1104. When the state of the wearable device complies with the regulations, vibration prompts can also be given, for example, vibration prompts are made through a buzzer. When the state of the wearable device complies with the regulations, voice prompts can also be given, for example, voice prompts are made through a speaker.

[0129] In each of the above embodiments of the present invention, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable medium to another computer-readable medium. For example, the computer instructions can be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer, or a data storage device such as a server or data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid-state drive), etc.

[0130] As mentioned above, the above are only the preferred specific embodiments of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A wearable device, characterized in that, it includes: A first light emitter for emitting light of at least one color; A first light sensor for receiving the light of the at least one color; A second light emitter, the second light emitter being a vertical cavity surface laser emitter light-emitting element for emitting laser light; the first light sensor is used to detect the laser light emitted by the second light emitter; A second light sensor for detecting the laser light emitted by the second light emitter; the distance between the first light sensor and the second light emitter is different from the distance between the second light sensor and the second light emitter; A processor, connected to the first light emitter, the first light sensor, the second light emitter and the second light sensor, and determines the wearing state of the wearable device according to the number of the first light sensor and the second light sensor that detect the laser signal.

2. The wearable device according to claim 1, characterized in that, The wearable device includes at least one second light emitter and at least four of the second light sensors, the at least four second light sensors are evenly arranged around the second light emitter, and the second light sensors are arranged between the second light emitter and the first light sensor.

3. The wearable device according to claim 2, characterized in that, The wearable device includes four of the first light sensors, and the four first light sensors are arranged in one-to-one correspondence with four of the at least four second light sensors.

4. The wearable device according to claim 2, characterized in that, The wearable device includes eight of the first light sensors and four of the second light sensors, the first light sensors are evenly arranged around the second light emitter and the second light sensors, and four of the eight first light sensors are arranged in one-to-one correspondence with the four second light sensors.

5. The wearable device according to any one of claims 1-4, characterized in that, When the number of the first light sensors that receive the laser is 0, and the number of the second light sensors that receive the laser ≥ 1, the processor determines that the wearing state of the wearable device is comfortable wearing; When the number of the first light sensors that receive the laser ≥ 1, and the number of the second light sensors that receive the laser ≥ 1, the processor determines that the wearing state of the wearable device is loose wearing.

6. The wearable device according to any one of claims 1-4, characterized in that, When the number of the first light sensors that receive the laser is 0, and the number of the second light sensors that receive the laser ≥ 2, the processor determines that the wearing state of the wearable device is comfortable wearing; When the number of the first light sensors that receive the laser ≥ 1, and the number of the second light sensors that receive the laser ≥ 1, the processor determines that the wearing state of the wearable device is loose wearing.

7. The wearable device according to claim 5, characterized in that, The wearable device further includes a display screen for displaying the wearing state determined by the processor.

8. The wearable device according to claim 5, characterized in that, The wearable device further includes: A prompter for prompting the user when the wearable device is loosely worn.

9. The wearable device according to any one of claims 1-4, characterized in that the wearable device includes a capacitance sensor for detecting the contact capacitance and sending the detected capacitance value to the processor; the processor determines the wearing state of the wearable device according to the optical signals detected by the first optical sensor and the second optical sensor, and the capacitance value.

10. The wearable device according to claim 9, characterized in that the first light emitter is used for emitting infrared light; the first light sensor is used for detecting the reflected infrared light and sending the detected infrared light signal to the processor; the processor determines the wearing state of the wearable device according to the laser signals detected by the first optical sensor and the second optical sensor, the infrared light signal detected by the first optical sensor, and the capacitance value.

11. The wearable device according to any one of claims 1-4, characterized in that the first light emitter and the first light sensor share the light emitter and the light sensor in the PPG module, and the second light emitter is located at the center of the PPG module.

12. The wearable device according to any one of claims 1-4, characterized in that a light-shielding wall is provided between the first light emitter and the first light sensor, between the second light emitter and the second light emitter, and / or between the second light sensor and the first light emitter.

13. A wearing state detection method applied to the wearable device according to claim 1, characterized in that the method includes: The second light emitter emits laser light, and the second light emitter is a vertical cavity surface laser emitting element; The first light sensor and the second light sensor detect the reflected laser light; Determine the wearing state of the wearable device according to the number of the first light sensor and the second light sensor that detect the laser signal.

14. The method according to claim 13, characterized in that before the second light emitter emits laser light, the method further includes: The first light emitter emits infrared light; The first light sensor receives the infrared light; Determine the wearing state of the wearable device according to the infrared light signal received by the first light sensor; When the wearing state of the wearable device is worn, the second light emitter emits laser light; The first light sensor and the second light sensor detect the reflected laser light; Determine the wearing state of the wearable device according to the laser signals detected by the first light sensor and the second light sensor.

15. The method according to claim 13, characterized in that the wearable device includes a capacitance sensor for detecting the contact capacitance; before the second light emitter emits laser light, the method further includes: Determine the wearing state of the wearable device according to the contact capacitance detected by the capacitance sensor; When the wearing state of the wearable device is worn, the second light emitter emits laser light; The first light sensor and the second light sensor detect the reflected laser light; Determine the wearing state of the wearable device according to the laser signals detected by the first light sensor and the second light sensor.

16. The method according to any one of claims 13 - 15, wherein, Determining the wearing state of the wearable device according to the laser signals detected by the first light sensor and the second light sensor specifically includes: When the number of first light sensors receiving the laser is 0, and the number of second light sensors receiving the laser ≥ 1, determine that the wearing state of the wearable device is comfortably worn; When the number of first light sensors receiving the laser ≥ 1, and the number of second light sensors receiving the laser ≥ 1, determine that the wearing state of the wearable device is loosely worn.

17. The method according to any one of claims 13 - 15, wherein, Determining the wearing state of the wearable device according to the laser signals detected by the first light sensor and the second light sensor specifically includes: When the number of first light sensors receiving the laser is 0, and the number of second light sensors receiving the laser ≥ 2, determine that the wearing state of the wearable device is comfortably worn; When the number of first light sensors receiving the laser ≥ 1, and the number of second light sensors receiving the laser ≥ 1, determine that the wearing state of the wearable device is loosely worn.

18. The method according to claim 14 or 15, wherein, Before the second light emitter emits laser light, the method further includes: the first light emitter emits infrared light; the capacitance sensor is used to detect the contact capacitance; Determining the wearing state of the wearable device according to the laser signals detected by the first light sensor and the second light sensor specifically includes: Determine the wearing state of the wearable device according to the number of first light sensors detecting the laser and the number of second light sensors detecting the laser; When the wearing state of the wearable device is not loosely worn, further determine the wearing state of the wearable device according to the infrared light signal received by the first light sensor, the contact capacitance detected by the capacitance sensor, the number of first light sensors detecting the laser, and the number of second light sensors detecting the laser.

19. The method according to claim 18, wherein, When the wearing state of the wearable device is worn, the method further includes: The first light emitter emits light of at least one color; The first light sensor receives the light of at least one color; Determine the wearing state of the wearable device according to the light signals of at least one color received by the first light sensor.

20. The method according to any one of claims 13 - 15, wherein, The method further includes: When the wearing state of the wearable device is comfortably worn, display the wearing state.

21. The method according to any one of claims 13-15, wherein, the method further comprises: when the wearing state of the wearable device is loose, displaying a first prompt message for prompting the user that the current wearing is too loose.

22. A computer-readable storage medium, wherein, it includes computer-readable instructions, and when a computer reads and executes the computer-readable instructions, the computer is caused to execute the method according to any one of claims 13-21.

23. A computer program product, wherein, it includes computer-readable instructions, and when a computer reads and executes the computer-readable instructions, the computer is caused to execute the method according to any one of claims 13-21.

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