Intelligent wearable device and control method thereof

Abstract

The invention discloses intelligent wearable equipment and a control method thereof, and relates to the technical field of intelligent wearable equipment, the intelligent wearable equipment comprises an equipment body, an ink piezoresistance detection module and a control module, the equipment body is provided with a wearing part, and the wearing part is in contact with a user under the condition that the intelligent wearable equipment is worn; the ink piezoresistance detection module is arranged on the wearing part, and the ink piezoresistance detection module is used for outputting a corresponding detection signal according to the contact pressure borne by the wearing part; and the control module is arranged on the equipment body and is used for receiving the detection signal and determining the wearing state of the intelligent wearable equipment according to the detection signal. The invention aims to reduce the risk of false triggering, improve the accuracy of wearing detection, prolong the standby time of the intelligent wearable device, and reduce the power loss, thereby improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of smart wearable device technology, and in particular to a smart wearable device and its control method. Background Technology

[0002] With the rapid development of augmented reality (AR) technology, smart wearable devices are becoming increasingly widespread. To enhance user experience, more and more smart wearable devices are incorporating features such as automatic wear detection. Currently, most wear detection solutions employ capacitive sensing technology, integrating a flexible printed circuit board (FPC) at the point of contact between the smart wearable device and the human body to sense contact signals and determine whether the device is being worn. However, this solution has several limitations: firstly, the introduction of FPC increases the complexity of the structural design, requiring space to be reserved for circuitry during assembly, which is detrimental to the design of thinner and lighter products; secondly, capacitive sensors are susceptible to interference from the external environment. When the device is not being worn, the presence of metal objects or the user's hand holding the temples can easily trigger false triggers, leading to misjudgments. Conversely, when the device is actually being worn and powered on, poor contact or unstable signals may cause it to be misjudged as "not being worn," reducing the user experience. Summary of the Invention

[0003] The main objective of this invention is to provide a smart wearable device and its control method, which aims to reduce the risk of false triggering, improve the accuracy of wear detection, extend the standby time of the smart wearable device, reduce power consumption, and thus enhance the user experience.

[0004] To achieve the above objectives, the present invention proposes a smart wearable device, the smart wearable device comprising: The device body has a wearing part that comes into contact with the user when the smart wearable device is worn. An ink piezoresistive detection module is disposed on the wearing part, and the ink piezoresistive detection module is used to output a corresponding detection signal according to the contact pressure received by the wearing part; A control module, located on the device body, is used to receive the detection signal and determine the wearing status of the smart wearable device based on the detection signal.

[0005] In one embodiment, the ink piezoresistive detection module includes: Piezoresistive material, made of ink, is uniformly coated on the surface of the wearing part, and the resistance value of the piezoresistive material changes with the contact pressure applied to the wearing part; The bridge module includes a first resistor, a second resistor, and a third resistor; The first resistor and the second resistor are connected in series to form a first resistor module, the third resistor and the piezoresistor are connected in series to form a second resistor module, the first resistor module and the second resistor module are connected in parallel, and one end of the first resistor module is used to connect to the input voltage, and the other end of the first resistor module is used to ground.

[0006] In one embodiment, the wearing part has a contact surface that comes into contact with the user when the smart wearable device is worn, and the ink is uniformly coated on the contact surface.

[0007] In one embodiment, the smart wearable device includes smart glasses, the device body includes a glasses body, the wearing part includes temples, and the ink is uniformly coated on the outer surface of the temples.

[0008] In one embodiment, the eyeglasses body includes a frame, the temples have a through portion and an ear hook portion, the through portion is connected to one end of the frame and one end of the ear hook portion respectively, and the other end of the ear hook portion is the end of the temple; The ink is uniformly coated on the surface of the ear hook portion, and the surface comes into contact with the user when the smart glasses are worn.

[0009] In one embodiment, the ear hook portion has an arc-shaped structure, and the ear hook portion includes an ear-fitting area and a head-fitting area; When the smart glasses are worn, the head-fitting area is for contact with the user's head, and the ear-fitting area is for contact with the user's ear; the ink is uniformly coated on the ear-fitting area and / or the head-fitting area.

[0010] In one embodiment, the ink piezoresistive detection module further includes: A voltage detection circuit is used to detect the voltage difference between the voltage across the piezoresistor and the voltage across the second resistor, and output a corresponding voltage detection signal. An amplifier circuit is used to receive the voltage detection signal, amplify the voltage detection signal according to a preset amplification factor, and output a corresponding voltage amplification signal. The control module is used to receive the voltage amplified signal and determine the wearing status of the smart wearable device based on the voltage amplified signal.

[0011] The present invention also proposes a control method for a smart wearable device, based on any of the smart wearable devices described above, wherein the control method for the smart wearable device includes: Obtain the voltage detection signal corresponding to the ink piezoresistive detection module; If the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold, the smart wearable device is determined to be in a wearing state; if the voltage value corresponding to the voltage detection signal is less than or equal to the preset voltage threshold, the smart wearable device is determined to be in a non-wearing state. Once it is determined that the smart wearable device is being worn, the device is controlled to enter a normal working mode.

[0012] In one embodiment, determining that the smart wearable device is in a wearing state when the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold specifically includes: If the number of times the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold is greater than a first preset number, it is determined that the smart wearable device is in a wearing state. If the number of times the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold is less than or equal to the first preset number, the voltage detection signal corresponding to the ink piezoresistive detection module is obtained.

[0013] In one embodiment, after the smart wearable device enters a normal operating mode, the control method for the smart wearable device further includes: Repeat the process of obtaining the voltage detection signal corresponding to the ink piezoresistive detection module; If the number of times the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold is greater than the second preset number, calculate the continuous duration for which the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold. If the continuous duration is greater than or equal to a preset duration, the smart wearable device is controlled to enter a low-power mode; If the number of times the voltage value corresponding to the voltage detection signal is less than or equal to the preset voltage threshold is less than or equal to the second preset number, the process of obtaining the voltage detection signal corresponding to the ink piezoresistive detection module is repeated.

[0014] In practical applications, compared to traditional stress sheet or FPC-type pressure sensors, this invention employs an ink piezoresistive detection module. The ink layer is directly attached to the outer surface of the product, requiring only a miniature signal processing circuit internally, saving internal space and facilitating the miniaturization of smart wearable devices. Furthermore, since the piezoresistive ink is located on the outer layer in direct contact with the human body, it can detect wearing pressure more quickly and has a faster response time compared to traditional pressure sensors. Simultaneously, compared to capacitive detection solutions that are susceptible to interference from metal objects or hand grip, this solution is based on physical pressure detection. The smart wearable device's state change is only triggered when it is actually worn and contact pressure is generated, effectively reducing false wake-up operations when not worn. Thus, the accuracy of wear detection is improved, the standby time of the smart wearable device is extended, and the power consumption of the smart wearable device is reduced, thereby enhancing the user experience. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of functional modules provided in an embodiment of the smart wearable device of the present invention; Figure 2 This is a schematic diagram of functional modules provided for another embodiment of the smart wearable device of the present invention; Figure 3 A specific circuit diagram is provided for an embodiment of the bridge module of the smart wearable device of the present invention; Figure 4 A specific circuit diagram is provided for an embodiment of the amplifier circuit of the smart wearable device of the present invention; Figure 5 This is a schematic diagram of the structure of an embodiment of the smart wearable device of the present invention; Figure 6 A flowchart illustrating an embodiment of the control method for the smart wearable device of the present invention; Figure 7 A flowchart illustrating another embodiment of the control method for the smart wearable device of the present invention; Figure 8 A flowchart illustrating another embodiment of the control method for the smart wearable device of the present invention; Figure 9This is a flowchart of an embodiment of the control method for the smart wearable device of the present invention.

[0018] Explanation of icon numbers: 10. Wearing part; 20. Ink piezoresistive detection module; 30. Control module; 21. Bridge module; 22. Voltage detection circuit; 23. Amplifier circuit; 100. Ear hook part; 200. Head-fitting area; 300. Ear-fitting area; 400. Straight-through part.

[0019] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention.

[0021] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0022] With the rapid development of augmented reality (AR) technology, smart wearable devices are becoming increasingly widespread. To enhance user experience, more and more smart wearable devices are incorporating features such as automatic wear detection. Currently, most wear detection solutions employ capacitive sensing technology, integrating a flexible printed circuit board (FPC) at the point of contact between the smart wearable device and the human body to sense contact signals and determine whether the device is being worn. However, this solution has several limitations: firstly, the introduction of FPC increases the complexity of the structural design, requiring space to be reserved for circuitry during assembly, which is detrimental to the design of thinner and lighter products; secondly, capacitive sensors are susceptible to interference from the external environment. When the device is not being worn, the presence of metal objects or the user's hand holding the temples can easily trigger false triggers, leading to misjudgments. Conversely, when the device is actually being worn and powered on, poor contact or unstable signals may cause it to be misjudged as "not being worn," reducing the user experience.

[0023] Besides capacitive sensing, pressure detection technology is also being used to identify the wearing status of smart wearable devices. These solutions typically employ miniature pressure sensors, such as strain gauges or piezoresistive / piezoelectric sensors, to determine whether the user is wearing the device by sensing the minute deformations caused by bending or stress on the temples during wear. However, pressure sensors (especially strain gauges with supporting structures) usually require a certain amount of installation space to ensure accurate deformation detection. Allocating structural space for the sensor significantly increases the overall thickness or width, which is detrimental to meeting the demands for thinner and smaller smart wearable devices.

[0024] Therefore, refer to Figure 1This invention proposes a smart wearable device, the smart wearable device comprising: The device body has a wearing part 10, which comes into contact with the user when the smart wearable device is worn. An ink piezoresistive detection module 20 is disposed on the wearing part 10. The ink piezoresistive detection module 20 is used to output a corresponding detection signal according to the contact pressure received by the wearing part 10. The control module 30, located on the device body, is used to receive the detection signal and determine the wearing status of the smart wearable device based on the detection signal.

[0025] In this embodiment, the smart wearable device includes, but is not limited to, AR glasses, smart bracelets, smartwatches, and smart earphones. The wearing part 10 is used to contact the user when worn. The control module 30 can be implemented using a main controller, such as an MCU (Micro Controller Unit), FPGA (Field Programmable Gate Array), PLC (Programmable Logic Controller), DSP (Digital Signal Processor), or SOC (System on Chip).

[0026] In this embodiment, the ink piezoresistive detection module 20 can be implemented by directly printing conductive ink with piezoresistive properties (such as carbon nanotube / graphene composite piezoresistive ink) onto a predetermined area on the outer surface of the smart wearable device. The predetermined area corresponds to the location that comes into contact with the human body when worn.

[0027] Optionally, when the smart wearable device is AR glasses, the device body is the glasses body, and the temples of the glasses body can be the wearing part 10, which is used to contact the skin behind the ear and the side of the head when the user wears it. The ink piezoresistive detection module 20 can directly print conductive ink with piezoresistive properties onto a predetermined area on the outer surface of the temples through a screen printing process. For example, the predetermined area corresponds to the position that contacts the auricle and temporal region of the human body when worn. The thickness of the printed layer is set in advance by the R&D personnel. In this embodiment, 10-30 micrometers can be selected to form a flexible, transparent or semi-transparent sensing electrode structure without affecting the appearance. When the user wears the glasses, the temples undergo slight deformation under the pressure of the human head, causing the piezoresistive ink layer printed on its outer surface to be simultaneously compressed and produce microstructural changes, thereby causing a measurable change in its resistance value (usually a decrease in resistance), generating a detection signal proportional to the pressure magnitude.

[0028] Optionally, when the smart wearable device is a smart earphone, assuming it is an in-ear true wireless earphone (TWS), the device body is the earphone body, which includes a shell and a cone-shaped wearing part 10 (i.e., earbud part) for insertion into the ear canal. This wearing part 10 contacts the inner wall of the ear canal and the auricle when the user wears the earphone. The ink piezoresistive detection module 20 can print flexible piezoresistive conductive ink on the outer surface of the earphone wearing part 10 through processes such as microscale screen printing or inkjet printing, forming a ring-shaped or dot-matrix sensing area, the position of which corresponds to the key force area that contacts the ear canal skin after the earphone is inserted into the ear canal. When the user inserts the earphone into the ear canal and wears it securely, the ear canal wall applies uniform pressure to the outer wall of the earphone, causing slight compression deformation of the printed ink layer, changing its internal conductive network structure, causing a decrease in resistance, and generating a detection signal proportional to the pressure.

[0029] Optionally, for smartwatches or smart bracelets, piezoresistive ink can be printed on the inner side of the strap where it contacts the skin, enabling precise "skin-to-skin" wearing recognition. For smart headphones / VR headsets, ink can be printed on the inside of the headband or earcups to detect the pressure on the user's head while wearing the device, thereby automatically adjusting the audio output mode or achieving energy saving in conjunction with the wearing status. For smart rings or wearable patches, ink can also be printed on micro-curved surfaces to achieve pressure detection.

[0030] Taking AR glasses as an example of a smart wearable device, the temple of the glasses is the wearing part 10, which contacts the skin behind the ear and the side of the head when worn by the user. Conductive ink (such as carbon nanotube / graphene composite piezoresistive ink) is printed on the outer surface of the temple corresponding to the position that contacts the auricle and temporal region when worn. The ink piezoresistive detection module 20 may include a Huygens bridge circuit and piezoresistive ink. The piezoresistive ink serves as one arm of the bridge, and the other arms can use high-precision resistors with the same resistance value and low temperature coefficient, and the resistance value is basically the same as that of the piezoresistive ink when there is no pressure (within the allowable error range), forming a balanced bridge. When the temple is not subjected to external force (i.e., the AR device is not worn), the piezoresistive ink does not deform, its resistance value remains in its initial state, and the bridge output voltage is the reference value. When the user wears the glasses, the temple undergoes slight deformation under pressure, causing the piezoresistive ink layer printed on its outer surface to be simultaneously compressed, thereby causing a measurable change in its resistance value (usually a decrease in resistance), breaking the bridge balance, and generating a differential voltage signal proportional to the magnitude of the pressure. The differential voltage signal is amplified, filtered, and converted from analog to digital before being sent to the control module 30. The control module 30 uses a preset threshold algorithm to determine whether the device is currently being worn. For example, if the detected signal exceeds the set threshold and remains so for a certain period of time, it is determined to be "worn," triggering the device to power on or wake up the system and enter normal operating mode; if the detected signal is less than the set threshold, it is determined to be "not worn," initiating a hibernation or shutdown process and entering a low-power state.

[0031] It should be noted that conductive ink can be printed in multiple locations on smart wearable devices. For example, ink detection areas can be set on both temples of AR glasses, and ink can be printed evenly in the ink detection areas to achieve dual-sided collaborative judgment, improve recognition accuracy, and avoid misjudgment of wearing status caused by accidental touch on one side.

[0032] In practical applications, compared to traditional stress sheet or FPC-type pressure sensors, this invention employs an ink piezoresistive detection module 20. The ink layer is directly attached to the outer surface of the product, requiring only a micro-signal processing circuit internally, saving internal space and facilitating the miniaturization of smart wearable devices. Furthermore, since the piezoresistive ink is located on the outer layer in direct contact with the human body, it can detect wearing pressure more quickly and has a faster response time compared to traditional pressure sensors. Simultaneously, compared to capacitive detection solutions that are susceptible to interference from metal objects or hand grip, this solution is based on physical pressure detection. The smart wearable device's state change is only triggered when it is actually worn and contact pressure is generated, effectively reducing false wake-up operations when not worn. Thus, the accuracy of wear detection is improved, the standby time of the smart wearable device is extended, and the power consumption of the smart wearable device is reduced, thereby enhancing the user experience.

[0033] In another embodiment, reference Figure 2 The ink piezoresistive detection module 20 includes: The piezoresistive element is made of ink, which is uniformly coated on the surface of the wearing part 10. The resistance value of the piezoresistive element changes with the contact pressure applied to the wearing part 10. Bridge module 21 includes a first resistor, a second resistor, and a third resistor; The first resistor and the second resistor are connected in series to form a first resistor module, the third resistor and the piezoresistor are connected in series to form a second resistor module, the first resistor module and the second resistor module are connected in parallel, and one end of the first resistor module is used to connect to the input voltage, and the other end of the first resistor module is used to ground.

[0034] It should be noted that piezoresistive ink is a functional ink with a piezoresistive effect. Its resistance value changes with external forces (such as pressure, bending, stretching, etc.). The resistance bridge (Wheatstone bridge) is a precision resistance measurement circuit that detects minute changes in the resistance value of the ink through the principle of balance. The minute voltage change generated by the resistance bridge can be amplified by the signal processing circuit, such as the amplifier circuit 23, and transmitted to the control module 30.

[0035] In this embodiment, the piezoresistive ink can be uniformly coated onto the surface of the wearing part 10, such as the outer surface of the temple of AR glasses, by a screen printing process using flexible piezoresistive conductive ink. When the AR glasses are not worn, the piezoresistive ink is not subjected to contact pressure, and the piezoresistive resistance value Rx is the initial resistance value. When the AR glasses are worn, the piezoresistive ink is subjected to the contact pressure generated by wearing, and the resistance value Rx decreases because the micro-conductive network is compressed.

[0036] refer to Figure 3 R1 is the first resistor, R2 is the second resistor, R3 is the third resistor, and Rx is the resistance value corresponding to the piezoresistive ink. R1, R2, and R3 are typically high-precision resistors with the same resistance value and low temperature coefficient, and their resistance value Rx is basically the same as the piezoresistive ink's resistance value when there is no pressure, i.e., R1=R2=R3=Rx. The bridge's output signal is taken from node A between R1 and R2 and node B between R3 and Rx, i.e., the differential output voltage Vout= Vo1-Vo2.

[0037] Because resistors have resistance errors, and the piezoresistive ink may exhibit resistance deviations due to process limitations when printed onto the surface of the wearing part 10, calibration is required before shipment. This ensures that the Vout of the smart wearable device under no-force conditions equals Vo1 - Vo2. A certain error range is set based on the product form. If the detected voltage value remains constant within this range for an extended period, the smart wearable device is considered not to be worn. If the voltage exceeds this error range and the detection results remain stable, the user is considered to be wearing the device. To reduce errors, resistors R1, R2, and R3 are all resistors with small error coefficients. These resistors maintain stable resistance values ​​over a wide temperature range and are unaffected by external forces. The error range can be pre-set by the R&D personnel. In this embodiment, the input voltage front-end can use an LDO and capacitor for voltage regulation to power Vin and the signal processing circuit, reducing voltage fluctuations in the front-end stage and ensuring that the user's wearing status is only reflected when the Rx resistance changes. According to the impedance curve characteristics of the piezoresistive ink, when subjected to contact pressure, the Rx resistance decreases, the Vo2 voltage decreases, and correspondingly, the output voltage Vout increases.

[0038] Optionally, this embodiment uses 5%. Assuming the smart wearable device detects an output voltage of 1V when not subjected to contact pressure, the corresponding first preset voltage range can be set to 0.95V to 1.05V. Assuming the output voltage Vout during wear should be 3V, the corresponding second preset voltage range can be set to 2.85V to 3.15V. Thus, the control module 30 can determine that the device is not wearing when the output voltage is within the first preset voltage range, and determine that it is wearing when the output voltage is within the second preset voltage range. Since the voltage difference between the first and second preset voltage ranges is large, the accuracy of wear detection can be improved. Thus, the control module 30 only makes a clear judgment within these two voltage ranges, and only determines that the device is wearing when the voltage signal stably falls within the second preset voltage range, avoiding misjudgments caused by noise, transient interference, or partial contact. The existence of the intermediate ambiguity zone (1.05, 2.85) is equivalent to setting a "hysteresis band" or "safety interval," preventing the control module 30 from frequently jittering and switching states near the boundary. In addition, a delay confirmation mechanism can be added, which requires the signal to remain stable in the voltage range for a period of time (such as 200ms) before switching states, further improving the accuracy and stability of detection.

[0039] Optionally, this embodiment uses 5%. Assuming the smart wearable device detects an output voltage of 1V when not subjected to contact pressure, the corresponding first preset voltage range can be set to 0.95V to 1.05V. The control module 30 can determine that the device is in an unworn state when the output voltage is within the first preset voltage range, and determine that it is in a worn state when the output voltage exceeds the second preset voltage range. In this way, only the voltage value corresponding to the unworn state needs to be calibrated, without the need to accurately measure the voltage value when worn. A voltage value greater than 1.05V is always determined to be in a worn state. Even if the contact voltage during wearing varies due to individual differences or pressure (e.g., 2.5V or 3.5V), it can still be identified as a "wearing state," improving adaptability.

[0040] By selecting appropriate bridge resistors and combining them with printed piezoresistive ink, high-sensitivity detection is achieved, where even a small pressure applied during wear can cause a significant change in resistance. Calibration is performed before leaving the factory to ensure consistency. Furthermore, the device is only recognized as being worn when actually worn, avoiding false or missed wake-ups and improving the accuracy of wear recognition.

[0041] To accommodate users with different head shapes who experience varying pressure levels leading to different impedance and voltage changes, in another embodiment, the ink piezoresistive detection module 20 further includes: Voltage detection circuit 22, the voltage detection circuit 22 is used to detect the voltage difference between the voltage across the piezoresistor and the voltage across the second resistor, and output the corresponding voltage detection signal; Amplification circuit 23 is used to receive the voltage detection signal, amplify the voltage detection signal according to a preset amplification factor, and output a corresponding voltage amplification signal. The control module 30 is used to receive the voltage amplification signal and determine the wearing status of the smart wearable device based on the voltage amplification signal.

[0042] In this embodiment, the voltage detection circuit 22 measures the difference between the voltage (Vo1) across the piezoresistor and the voltage (Vo2) across the second resistor (R2). This can be achieved using a dedicated instrumentation amplifier, which integrates a three-operation amplifier structure and has an extremely high common-mode rejection ratio, effectively suppressing power supply fluctuations and environmental noise. Alternatively, it can be sampled directly using the MCU's built-in differential ADC, connecting the two output terminals A and B of the Wheatstone bridge to the MCU's differential analog input channel; using the MCU's internal programmable gain amplifier for preliminary amplification; and directly digitizing the signal without the need for an additional external amplifier circuit 23.

[0043] In this embodiment, the amplifier circuit 23 amplifies the voltage detection signal output by the voltage detection circuit 22 to improve the signal's detectability and stability. The amplifier circuit 23 can be implemented using an amplifier and a voltage follower circuit. The control module 30 receives and analyzes the amplified voltage signal to determine the device's wearing status.

[0044] refer to Figure 4 OP1, OP2, OP3, and OP4 are four amplifiers. OP1, OP2, OP3, and resistors R4, R5, R6, R7, R8, R9, and R10 form a three-op-amp amplifier circuit. The first stage consists of two non-inverting proportional operational amplifier circuits, and the second stage is a differential operational amplifier circuit. The first stage circuit is composed of OP1, OP2, R4, R5, and R6, and the second stage circuit is composed of OP3, R7, R8, R9, and R10. OP4 is a voltage follower. The three operational amplifier circuit is a voltage amplifier circuit used to amplify the output voltage. When the resistance values ​​of R7 and R8 are equal, the relationship between the input voltage difference (Vo1-Vo2) and the output voltage Vout is shown in the following formula: Vout=(Vo1-Vo2)*(R4+R5+R6) / R4. Researchers can adjust the values ​​of R4, R5 and R6 according to the actual voltage detection range to achieve appropriate voltage amplification. Finally, after passing through the voltage follower circuit OP4, the input impedance is further increased, voltage fluctuations are reduced, and the output voltage is stabilized.

[0045] In accordance with the above embodiments, the control module 30 receives a voltage amplification signal Vout and determines the wearing status of the smart wearable device based on the voltage amplification signal Vout. For example, the control module 30 compares Vout with a first preset voltage range. If Vout is within the first preset voltage range, it determines that the smart wearable device is not being worn; if Vout is within the first preset voltage range, it determines that the smart wearable device is being worn. The control module then controls the smart wearable device to enter a normal operating mode and actively activates corresponding functions, such as activating the audio interaction module in the smart wearable device. The audio interaction module includes a microphone for sound pickup and a speaker for sound output. It can convert sound into electrical signals and transmit them to the main control module, and can also convert digital electrical signals emitted by the main control module into analog prompt sounds, etc.

[0046] The amplifier circuit 23 addresses the issue of uneven pressure on the piezoresistive ink, large impedance variations, and significant output voltage signal fluctuations caused by substantial differences in head shape and wearing habits among different users. The voltage follower circuit, with its extremely high input impedance and extremely low output impedance, effectively isolates the amplifier circuit 23 from the subsequent control module 30, preventing signal attenuation or oscillation caused by load effects and improving signal stability. This further enhances the accuracy of wear detection.

[0047] In one embodiment, the wearing part 10 has a contact surface that comes into contact with the user when the smart wearable device is worn, and the ink is uniformly coated on the contact surface.

[0048] In this embodiment, a piezoresistive conductive ink is uniformly coated onto the contact surface using a printing process to form a flexible, miniaturized pressure sensing layer. This pressure sensing layer, as part of a Wheatstone bridge, can generate measurable resistance changes based on minute deformations caused by contact pressure, thereby enabling accurate identification of the wearing status via signal processing circuitry and control module 30.

[0049] In this embodiment, the smart wearable device includes smart glasses, the device body includes a glasses body, the wearing part 10 includes temples, and the ink is uniformly coated on the outer surface of the temples.

[0050] It should be noted that the control module 30 is integrated into the glasses body, and the ink is evenly printed on the outer surface of the temples. When the smart glasses are not worn by the user, the pressure sensing layer is not under force, and the resistance Rx remains at its initial value. When the user wears the glasses, the temples are subjected to pressure, the ink layer is compressed and deformed, and the resistance value Rx decreases. The control module 30 receives the amplified voltage signal, determines the wearing state based on the voltage signal Vout, and controls the device to power on, go to sleep, or start interactive functions (such as voice assistant, camera, display module, etc.).

[0051] In this embodiment, to increase the detection range and sensitivity, ink can be printed symmetrically at the wearing areas of both temples. The two piezoresistive inks are connected in series with wires and then connected to the bridge module 21. Thus, when the user wears the glasses, both temples are simultaneously compressed, causing compression deformation of the ink layers at both locations. The resistance values ​​decrease synchronously. Because the two piezoresistive sections are connected in series, the total resistance change is twice that of a single side, meaning the resistance change is greater, the output voltage increases significantly, and it becomes easier to detect minute changes in ink layer deformation, thereby improving the accuracy of the wearing detection.

[0052] In practical applications, the piezoresistive ink is located on the outer surface of the temple, directly contacting the human body. Compared to traditional pressure detection methods, it can respond faster and sense the actual wearing pressure immediately. Unlike capacitive sensing, which is easily interfered with by hand gripping or the proximity of metal objects, this solution is based on physical deformation detection and only generates a valid signal when actually worn. Simultaneously, the dual-sided series design can improve the problem of uneven pressure on the left and right temples due to user habits (e.g., one side tight, one side loose). The control module 30 detects the total pressure effect, reducing missed detections caused by poor contact on one side and improving recognition consistency under different wearing postures. Furthermore, even if the ink on one side ages or wears down due to prolonged wear, the other side can still maintain basic detection functions, improving fault tolerance.

[0053] In one embodiment, optionally, the eyeglass body includes a frame, and the temple has a through portion 400 and an ear hook portion 100. The through portion 400 is connected to one end of the frame and one end of the ear hook portion 100, and the other end of the ear hook portion 100 is the end of the temple. The ink is uniformly coated on the surface of the ear hook portion 100, and the surface comes into contact with the user when the smart glasses are worn.

[0054] In this embodiment, the glasses body includes a frame and two symmetrically arranged temples. Each temple consists of two parts: a straight section 400 and an ear hook section 100. The straight section 400 connects to a straight or slightly curved rod of the frame, primarily serving a structural support function. The ear hook section 100 is a curved hook-shaped structure extending from the end of the straight section 400, typically C-shaped or L-shaped, used to hook behind the user's ear. When worn, the outer surface of the ear hook section 100 is in close contact with the skin behind the ear and the side of the head, bearing the dual pressure from the head and ear. Therefore, conductive ink can be printed on the outer surface of the ear hook section 100.

[0055] It should be noted that the through section 400 mainly serves a structural support function. During wear, it has a relatively loose contact with the head, resulting in lower pressure and instability due to movement. For example, during light wear or exercise, it may only slightly conform to the head, making it difficult to generate sufficient deformation signals. The ear hook section 100, on the other hand, must simultaneously withstand the clamping force of the auricle and the compression of the side wall of the head, forming a "dual-point force" mechanism. The pressure value is significantly higher than that of the through section 400, sufficient to cause a noticeable change in the resistance of the ink layer. Moreover, the pressure distribution is stable and is not easily interrupted by slight head movements. Furthermore, the ear hook section 100 is only subjected to pressure when the glasses are properly worn, while the through section 400 may be accidentally touched or pressed in non-wearing scenarios such as holding or placing on a table, leading to false triggering. Therefore, since the pressure detection of the ear hook section 100 better reflects the actual wearing state, this embodiment places the piezoresistive ink on the outer surface of the ear hook section 100 rather than the outer surface of the through section 400.

[0056] Traditional pressure detection methods often employ built-in stress plates or miniature FPC pressure sensors, which need to be installed inside the temple. However, applying such solutions to the ear hook portion 100 has significant limitations: the ear hook portion 100 is typically a small, curved structure with extremely limited internal space, and is often solid or only accommodates wires; the stress plate or FPC sensor is relatively large and may not be able to be embedded in the curved area; forcibly slotting it will affect the structural strength and increase the risk of breakage. In this embodiment, the piezoresistive ink is directly formed on the outer surface by printing, without occupying the internal space of the ear hook; the ink layer is thin, which does not affect the appearance, wearing comfort, or structural integrity of the smart glasses. In addition, the ink is located directly at the contact tip, and the pressure on the outer surface is directly applied to the ink layer without being conducted through the outer shell, resulting in a faster response speed and higher sensitivity.

[0057] By printing piezoresistive ink onto the outer surface of the ear hook portion 100 of the temple, the dual pressure of the ear hook portion 100 on the head and ear during wear is fully utilized, achieving a more stable and stronger signal output than the straight-through portion 400, thus improving the accuracy and reliability of wear detection. Simultaneously, this solution addresses the problem of traditional stress-plate sensors being difficult to install in the ear hook portion 100 due to their large size and required internal space.

[0058] Optionally, refer to Figure 5 The ear hook portion 100 has an arc-shaped structure and includes an ear-fitting area 300 and a head-fitting area 200. When the smart glasses are worn, the head-fitting area 200 is used to contact the user's head, and the ear-fitting area 300 is used to contact the user's ear; the ink is uniformly coated on the ear-fitting area 300 and / or the head-fitting area 200.

[0059] Under normal circumstances, when the user is not wearing glasses, the ear hook portion 100 and the straight section 400 of the temple are not compressed and remain in a natural state. When the user wears glasses, the ear hook portion 100 and the straight section 400 are subjected to gravity and the force of head support, resulting in slight deformation, especially on the surface of the temple where the force is greater and the deformation is larger. Thus, based on whether the temple is deformed at the point of force application, the deformation of the ink layer is converted into an analog resistance value, which is then converted into an electrical signal and amplified. The magnitude of the finally collected electrical signal is used to determine whether it exceeds a set threshold (including a first preset voltage threshold), thereby determining whether the user is wearing the glasses. When the user is wearing glasses, corresponding functions can be actively activated, such as activating the audio interaction module to indicate that the glasses are being worn. When the user is not wearing glasses, the device can first be controlled to enter standby mode. If this state remains unchanged for a long time, the product can be further set to a low-power mode, thereby reducing power consumption and improving battery life.

[0060] In this embodiment, the ear-fitting area 300 is located near the back of the ear and is used to contact the user's auricle; the head-fitting area 200 is used to contact the skin on the side of the user's head; a printing process can be used to uniformly coat the outer surface of the ear-fitting area 300 and / or the head-fitting area 200 with flexible piezoresistive conductive ink; single-area printing (such as only the head-fitting area 200) or dual-area collaborative printing (ear-fitting area 300 + head-fitting area 200) can be selected to form a distributed pressure sensing network; the piezoresistive ink is connected to a Wheatstone bridge as a variable resistor Rx; a voltage detection circuit 22, an amplifier circuit 23, and a control module 30 are provided to determine the wearing status and control the operating mode of the device. After the user puts on the smart glasses, the ear hook 100 hooks behind the ear; the ear contact area 300 is held by the auricle, and the head contact area 200 is squeezed by the side wall of the head; the ink layers in both areas are simultaneously compressed, resulting in slight compression deformation; the conductive network inside the ink is compressed, and the resistance value drops significantly; the bridge becomes unbalanced, generating a measurable differential voltage change; this change is amplified by the amplifier circuit 23 and sent to the MCU; the MCU determines the relationship between Vout and a first preset threshold to determine the wearing status. For example, if Vout exceeds the first preset voltage range and remains stable for a preset duration, it is determined to be in a wearing state; triggering actions such as automatically waking up the system, starting the audio interaction module, playing a voice prompt: "Wearing, welcome to use," or enabling AR display, environmental perception, or voice assistant functions. Otherwise, the smart wearable device can be controlled to enter standby mode.

[0061] When ink is printed simultaneously in the ear-fitting area 300 and the head-fitting area 200, pressure changes at both contact points on the ear and head can be monitored simultaneously. Even if one area has poor contact, the other area can still provide a valid signal, reducing the risk of missed detection in single-point detection. Meanwhile, the ear hook portion 100 is the main load-bearing structure during wear, and its contact pressure under wearing conditions is greater than that of the through portion 400. This results in a sensitive response, high output signal amplitude, and ease of acquisition and judgment, reducing the probability of false triggering.

[0062] The present invention also proposes a control method for a smart wearable device, based on any of the smart wearable devices described above, with reference to... Figure 6 The control method for the smart wearable device includes: Step S100: Obtain the voltage detection signal corresponding to the ink piezoresistive detection module; Step S200: If the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold, determine that the smart wearable device is in a wearing state; and if the voltage value corresponding to the voltage detection signal is less than or equal to the preset voltage threshold, determine that the smart wearable device is in a non-wearing state. Step S300: When it is determined that the smart wearable device is in a wearing state, control the smart wearable device to enter the normal working mode.

[0063] In this embodiment, the control method for the smart wearable device of the present invention can be implemented in a control device for the smart wearable device. The control device includes a memory, a processor, and a control program for the smart wearable device stored in the memory and executable on the processor. The control program for the smart wearable device is configured to implement the steps of the control method for the smart wearable device. The control device can be implemented using a main controller, such as an MCU, DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), PLC, or SOC (System on Chip). In this embodiment, the control device includes the control module 30 described in the above embodiment.

[0064] In accordance with the above embodiments, the ink piezoresistive detection module 20 is disposed on the outer surface of the wearing part 10 of the smart wearable device. Specifically, the ink piezoresistive detection module 20 may include piezoresistive ink, a bridge module 21, a signal amplification circuit 23, and other signal processing circuits. When the wearing part 10 is not subjected to external force (i.e., the smart wearable device is not worn by the user), the piezoresistive ink does not deform, its resistance value remains in its initial state, and the bridge output voltage is a reference value. When the user wears the smart wearable device, the wearing part 10 undergoes slight deformation under pressure, causing the piezoresistive ink layer printed on its outer surface to be simultaneously compressed, thereby causing a measurable change in the piezoresistive resistance value (usually a decrease in resistance), breaking the bridge balance and generating a differential voltage signal proportional to the pressure magnitude. The differential voltage signal is amplified, filtered, and converted from analog to digital by the signal processing circuit. The corresponding voltage detection signal is sent to the control module 30. The control module 30 acquires the voltage detection signal and compares its corresponding voltage value with a preset voltage threshold. If the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold, it determines that the smart wearable device is in the wearing state. If the voltage value corresponding to the voltage detection signal is less than or equal to the preset voltage threshold, it determines that the smart wearable device is in the non-wearing state.

[0065] It should be noted that the preset voltage threshold is set in advance by the R&D personnel. It can be set to the output voltage value when the wearing part 10 of the smart wearable device is not subjected to contact pressure. For example, when the smart wearable device is not subjected to contact pressure, the detected output voltage is 1V. If the control module 30 determines that the corresponding voltage value is 1.5V based on the acquired voltage detection signal, it determines that the smart wearable device is in a wearing state. If it determines that the corresponding voltage value is lower than 1V based on the acquired voltage detection signal, it determines that the smart wearable device is in a non-wearing state. In this way, the control module 30 can control the working state of the smart wearable device based on its wearing state, automatically activating relevant functional modules without user operation. It can also control the smart wearable device to operate in a low-power mode when it is determined that it is not being worn, thereby extending the device's battery life.

[0066] In practical applications, this invention employs an ink piezoresistive detection module 20. The ink layer is directly attached to the outer surface of the product, located on the outer layer that directly contacts the human body. Compared to traditional pressure sensors, it can detect wearing pressure more quickly and has a faster response speed. Furthermore, unlike capacitive detection solutions which are susceptible to interference from metal objects or hand grip, this solution is based on physical pressure detection. The smart wearable device's state change is only triggered when it is actually worn and generates contact pressure, effectively reducing false wake-up operations when not worn. In addition, users do not need to manually press buttons or use voice commands to wake the device; the control device can automatically activate the device's functions, improving the user experience. By keeping the smart wearable device in a low-power standby state when the user is not wearing it, the standby time of the smart wearable device is extended, power consumption is reduced, and the user experience is further enhanced.

[0067] In one embodiment, reference Figure 7 The step of determining that the smart wearable device is in a wearing state when the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold specifically includes: Step S210: If the number of times the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold is greater than the first preset number, it is determined that the smart wearable device is in a wearing state. Step S220: When the number of times the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold is less than or equal to the first preset number of times, the voltage detection signal corresponding to the ink piezoresistive detection module 20 is obtained.

[0068] Based on the above embodiments, due to resistance errors and potential resistance deviations caused by process limitations when printing piezoresistive ink onto the surface of the wearing part 10, calibration is required before shipment. A certain error range is set according to the product form, ensuring the detected voltage value remains constant within this range over a long period. If the detected voltage value is within this range, the wearable device is determined to be not being worn. If the detected voltage exceeds this range and remains stable, the user is considered to be wearing the device. This error range can be preset by the R&D personnel. In this embodiment, 5% is used. Assuming the detected output voltage is 1V when the wearable device is not subjected to contact pressure, the corresponding first preset voltage range can be set to 0.95V to 1.05V. Assuming the output voltage Vout is 3V when worn, the corresponding second preset voltage range can be set to 2.85V to 3.15V. Thus, if the voltage value corresponding to the voltage detection signal is within the first preset voltage range, the control module 30 can determine that the device is not being worn; if the voltage value is within the second preset voltage range, the device is considered to be wearing the device. The larger voltage difference between the first and second preset voltage ranges improves the accuracy of wear detection. The control module 30 makes a clear judgment only within these two voltage ranges. It only determines that the device is being worn when the voltage signal falls within the second preset voltage range, thus avoiding misjudgments caused by factors such as noise, transient interference, or partial contact.

[0069] In this embodiment, a continuous sampling count judgment mechanism can also be added to effectively reduce the risk of misjudgment caused by instantaneous interference, hand touch, or wearing vibration, and improve the stability and reliability of wearing status recognition. The sampling count can be preset by the developers. In this embodiment, if the number of times the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold is continuously greater than a first preset number, the wearable device is determined to be in a wearing state. If the number of times the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold is continuously less than or equal to the first preset number, the acquisition of the voltage detection signal corresponding to the ink piezoresistive detection module 20 is repeated. The first preset number is set by the developers; in this embodiment, 5 is selected. Thus, the control module 30 will only determine that the smart wearable device is being worn, control it to enter normal working mode, and continue detection if the voltage value of the voltage detection signal acquired five consecutive times exceeds the first preset voltage range. If the control module 30 determines that the voltage value of the voltage detection signal acquired four consecutive times exceeds the first preset voltage range, and the voltage value of the fifth voltage detection signal is within the first preset voltage range, it will consider it to be in an unworn state and continue detection until the consecutive count reaches 5.

[0070] In practical applications, the sampling continuous sampling number judgment mechanism effectively eliminates brief unstable contacts such as hand touch, shaking, and wearing adjustment. For example, it reduces the risk of "turning on after wearing it for a short time" or "accidentally starting when walking and shaking", ensuring that the device is only activated when it is worn in a real and stable manner and when there is a need for use, thus improving the reliability of smart wearable devices.

[0071] In one embodiment, reference Figure 8 After the smart wearable device enters normal working mode, the control method for the smart wearable device further includes: Step S400: Repeat the process of obtaining the voltage detection signal corresponding to the ink piezoresistive detection module; Step S500: If the number of times the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold is greater than the second preset number, calculate the continuous duration of the voltage value corresponding to the voltage detection signal being less than the preset voltage threshold. Step S600: When the continuous duration is greater than or equal to a preset duration, control the smart wearable device to enter a low power consumption mode; Step S700: If the number of times the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold is less than or equal to the second preset number of times, the process of obtaining the voltage detection signal corresponding to the ink piezoresistive detection module 20 is repeated.

[0072] Based on the above embodiments, taking AR glasses as an example of a smart wearable device, the ink piezoresistive detection module 20 can perform periodic detection in a low-power mode to reduce power consumption. (Reference) Figure 9 When the user wears the glasses, the temples that come into contact with the human body (such as the through part 400 and the ear hook part 100) will be subjected to pressure, which will cause slight deformation. The pressure-sensitive ink printed on the surface of the temples will change its resistance due to the deformation. The change in resistance will cause the output voltage of the bridge module 21 to change. The corresponding voltage change value will be compared with the first preset voltage range to determine the wearing state and further control the working state of the AR glasses.

[0073] In this embodiment, the ink piezoresistive detection module 20 may further include a main controller. The main controller can directly output the corresponding detection result to the control module 30 based on the relationship between the output voltage change value and the first preset voltage range. The control module 30 controls the working state of the AR glasses according to the detection result. In this embodiment, the first preset number of times can be set to 3. If the voltage change value exceeds the first preset voltage range, the main controller can generate an interrupt signal to notify the control module 30. At the same time, the ink piezoresistive detection module 20 continues to detect. When the control module 30 receives the interrupt signal output by the main controller 3 times consecutively, that is, when it detects that the output voltage value is far beyond the first preset voltage range and relatively stable more than 3 times, it is determined to be in the wearing state, and the control module 30 controls the AR glasses to enter the normal working mode. Otherwise, periodic detection continues. Since when the user is not wearing the device, the pressure at the temple position in contact with the human body is released, the temple will return to its natural non-forced state, the piezoresistive resistance will also return to the resistance value when balanced, and the output voltage change value will also return to the first preset voltage range, therefore, when it is determined that the AR glasses are not being worn, the AR glasses are controlled to enter the standby state and enter the low power consumption mode.

[0074] To prevent false positives, the control module 30 continuously monitors the device. It determines the device is not being worn only if the number of times the voltage value corresponding to the voltage detection signal is below a preset voltage threshold exceeds a second preset number. This second preset number is pre-set by the developers; in this embodiment, it is set to 3. That is, if the output voltage value is detected to be within the first preset voltage range three or more times consecutively, it is determined that the user is not wearing the AR device, and the product is switched to standby mode, for example, by disabling the audio interaction function. Otherwise, continuous monitoring continues in normal operating mode.

[0075] In this embodiment, to further reduce the risk of false triggering, if the voltage value corresponding to the voltage detection signal is within the first preset voltage range for more than three consecutive times, the duration for which the voltage value corresponding to the voltage detection signal is less than the first preset voltage range can be calculated. The preset duration can be set in advance by the developers; in this embodiment, 3 minutes is selected. If the duration is greater than or equal to 3 minutes, it indicates that the signal is stable and the smart wearable device is not being worn by the user. In this case, the smart wearable device is controlled to enter a low-power mode, and periodic detection is performed in low-power mode. If the number of times the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold is less than or equal to a second preset number, or the duration for which the voltage value corresponding to the voltage detection signal is less than the first preset voltage range is less than 3 minutes, the process of acquiring the voltage detection signal corresponding to the ink piezoresistive detection module 20 is repeated, and continuous detection continues in normal operating mode. This minimizes the overall power consumption of the device.

[0076] In this embodiment, assuming the smart wearable device detects an output voltage of 1V when not subjected to contact pressure, the corresponding first preset voltage range can be set to 0.95V to 1.05V; assuming the output voltage should be 3V when worn, the corresponding second preset voltage range can be set to 2.85V to 3.15V. Periodic detection is performed when the device is in a low-power state. If the voltage value corresponding to the detected voltage signal exceeds the first preset voltage range at least three times (e.g., 2.86V for the first time, 2.9V for the second, and 3V for the third), it is determined that the device is being worn, and it is controlled to enter the normal operation module, changing from periodic detection to continuous detection. In normal operation mode, if the voltage detection signal is detected at least three times within the first preset voltage range, the duration is calculated. If it remains within the first preset voltage range for 3 minutes, it is determined that the device is not being worn, and the device is controlled to enter low-power mode and begin periodic detection. Similarly, in normal operation mode, if the voltage value corresponding to two consecutive detected voltage signals is within the first preset voltage range, it is not determined to be in an unworn state, and the device is still controlled to operate in normal operation mode. If the voltage does not remain within the first preset voltage range for 3 minutes, it will not be determined as an unworn state. For example, if the duration of the first preset voltage range is 2.5 seconds, the device will still operate in normal working mode.

[0077] Even after the smart wearable device enters normal operating mode, it continues to monitor and accurately identify actual wearing behavior through dual determination of the number of consecutive wears and the duration of wear. This reduces the risk of accidental shutdown or functional interruption due to brief removal of the device (such as adjusting the position of glasses or wiping the lenses). When the user does not need to use the device, it controls the device to enter a low-power mode, achieving "on-demand power supply," which improves the standby time of the smart wearable device and enhances the user experience.

[0078] The control method for a smart wearable device provided by this invention includes the smart wearable device described above. Compared with the prior art, the beneficial effects of the control method for a smart wearable device provided by this invention are the same as those of the smart wearable device provided in the above embodiments, and other technical features in the control method for the smart wearable device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0079] The above description is only a part of the embodiments of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A smart wearable device, characterized in that, The smart wearable device includes: The device body has a wearing part that comes into contact with the user when the smart wearable device is worn. An ink piezoresistive detection module is disposed on the wearing part, and the ink piezoresistive detection module is used to output a corresponding detection signal according to the contact pressure received by the wearing part; A control module, located on the device body, is used to receive the detection signal and determine the wearing status of the smart wearable device based on the detection signal.

2. The smart wearable device as described in claim 1, characterized in that, The ink piezoresistive detection module includes: Piezoresistive material, made of ink, is uniformly coated on the surface of the wearing part, and the resistance value of the piezoresistive material changes with the contact pressure applied to the wearing part; The bridge module includes a first resistor, a second resistor, and a third resistor; The first resistor and the second resistor are connected in series to form a first resistor module, the third resistor and the piezoresistor are connected in series to form a second resistor module, the first resistor module and the second resistor module are connected in parallel, and one end of the first resistor module is used to connect to the input voltage, and the other end of the first resistor module is used to ground.

3. The smart wearable device as described in claim 2, characterized in that, The wearing part has a contact surface, which comes into contact with the user when the smart wearable device is worn, and the ink is uniformly coated on the contact surface.

4. The smart wearable device as described in claim 3, characterized in that, The smart wearable device includes smart glasses, the device body includes a glasses body, the wearing part includes temples, and the ink is uniformly coated on the outer surface of the temples.

5. The smart wearable device as described in claim 4, characterized in that, The eyeglasses body includes a frame, and the temples have a straight section and an ear hook section. The straight section is connected to one end of the frame and one end of the ear hook section, and the other end of the ear hook section is the end of the temple. The ink is uniformly coated on the surface of the ear hook portion, and the surface comes into contact with the user when the smart glasses are worn.

6. The smart wearable device as described in claim 5, characterized in that, The ear hook portion has an arc-shaped structure, and the ear hook portion includes an ear-fitting area and a head-fitting area; When the smart glasses are worn, the head-fitting area is for contact with the user's head, and the ear-fitting area is for contact with the user's ear; the ink is uniformly coated on the ear-fitting area and / or the head-fitting area.

7. The smart wearable device as described in claim 2, characterized in that, The ink piezoresistive detection module also includes: A voltage detection circuit is used to detect the voltage difference between the voltage across the piezoresistor and the voltage across the second resistor, and output a corresponding voltage detection signal. An amplifier circuit is used to receive the voltage detection signal, amplify the voltage detection signal according to a preset amplification factor, and output a corresponding voltage amplification signal. The control module is used to receive the voltage amplified signal and determine the wearing status of the smart wearable device based on the voltage amplified signal.

8. A control method for a smart wearable device, characterized in that, Based on the smart wearable device as described in any one of claims 1 to 7, the control method of the smart wearable device includes: Obtain the voltage detection signal corresponding to the ink piezoresistive detection module; If the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold, the smart wearable device is determined to be in a wearing state; if the voltage value corresponding to the voltage detection signal is less than or equal to the preset voltage threshold, the smart wearable device is determined to be in a non-wearing state. Once it is determined that the smart wearable device is being worn, the device is controlled to enter a normal working mode.

9. The control method for a smart wearable device as described in claim 8, characterized in that, The step of determining that the smart wearable device is in a wearing state when the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold specifically includes: If the number of times the voltage value corresponding to the voltage detection signal is greater than a preset voltage threshold is greater than a first preset number, it is determined that the smart wearable device is in a wearing state. If the number of times the voltage value corresponding to the voltage detection signal is greater than the preset voltage threshold is less than or equal to the first preset number, the voltage detection signal corresponding to the ink piezoresistive detection module is obtained.

10. The control method for a smart wearable device as described in claim 8, characterized in that, After the smart wearable device enters normal working mode, the control method for the smart wearable device further includes: Repeat the process of obtaining the voltage detection signal corresponding to the ink piezoresistive detection module; If the number of times the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold is greater than the second preset number, calculate the continuous duration for which the voltage value corresponding to the voltage detection signal is less than the preset voltage threshold. If the continuous duration is greater than or equal to a preset duration, the smart wearable device is controlled to enter a low-power mode; If the number of times the voltage value corresponding to the voltage detection signal is less than or equal to the preset voltage threshold is less than or equal to the second preset number, the process of obtaining the voltage detection signal corresponding to the ink piezoresistive detection module is repeated.

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