Patent Publication Number: US-2023134896-A1

Title: Intelligent wearable product

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a National Stage of International Application No. PCT/CN2021/079209, filed on Mar. 5, 2021, which claims priority to Chinese Patent Application No. 202010170882.1, filed on Mar. 12, 2020. Both of the aforementioned applications are hereby incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     Embodiments of the present invention relate to the technical field of mobile terminals, and in particular, to an intelligent wearable product. 
     BACKGROUND 
     With development and popularization of the technology of an intelligent wearable watch, consumers have increasingly more requirements on functions, appearance, experience, and the like of the intelligent wearable watch. A heart rate detection function is widely used in a current watch. To implement detection through light transmission, a transparent region is disposed in each current housing. A transparent hole can be visually seen from appearance of the housing, and an integrated effect is poor. 
     SUMMARY 
     Embodiments of this application provide an intelligent wearable product that has an integrated visual effect in a transparent portion in which a functional component collects external information, thereby improving user experience. 
     An intelligent wearable product provided in this application includes a housing, a power supply circuit, a functional component, and an electrochromic film. A transparent portion is disposed on the housing, and the functional component and the power supply circuit are located inside the housing. The functional component is configured to collect an external parameter by using the transparent portion. In addition, the external parameter may be understood as a parameter (for example, a heart rate) of a human body or another environment parameter (for example, an image in an environment). The electrochromic film is disposed on an inner surface of the housing and shields the transparent portion. The power supply circuit is configured to supply power to the electrochromic film and the functional component, so that the electrochromic film is transparent when the functional component works. When the intelligent wearable product is not worn on a human body, the electrochromic film and the housing jointly present an integrated visual effect. In this application, under action of an electric field, the electrochromic film implements a reversible change between a color and transparency. When the intelligent wearable product is not worn on a human body, the functional component does not work, the electrochromic film is not powered on, the electrochromic film is visible in the transparent portion, and the transparent portion is invisible from an outer surface of the intelligent wearable product. In other words, the electrochromic film and the housing jointly present an integrated visual effect in this case. A color of the electrochromic film and a color of an outer surface of the housing may be a same color or may be different colors, but the integrated visual effect can still be presented, for example, a gradual change between two colors. When the functional component works (that is, when the intelligent wearable product is worn on a human body), the electrochromic film is powered on and becomes to be in a transparent color, and the functional component works normally. This application can improve quality and appearance experience of the intelligent wearable product, and improve competitiveness of the intelligent wearable product. 
     In a possible implementation, in a state in which the electrochromic film is not powered on, the electrochromic film and the outer surface of the housing are in a same color system. A limitation of the same color system in this implementation includes: The color of the electrochromic film is the same as the color of the outer surface of the housing, for example, both are black or have another color. The same system may also mean that the color of the electrochromic film and the color of the outer surface of the housing are different colors but belong to a same color system. Similar colors in a same color system may be combined together, so that the outer surface of the housing has an integrated visual sensation. 
     In a possible implementation, the housing includes a body and a transparent cover. The body is provided with a through-hole, and the transparent cover is connected to the body and shields the through-hole to form the transparent portion, that is, the transparent cover serves as a part of the housing in the transparent portion to shield an internal component of the intelligent wearable product. The electrochromic film is adhered to an inner surface of the transparent cover, and an outer surface of the transparent cover and an outer surface of the body jointly form an integrated outer surface. In this implementation, the electrochromic film and the transparent cover are structures independent of each other. The electrochromic film may be adhered to the inner surface of the housing by using glue. In this implementation, an existing housing structure of the intelligent wearable product does not need to be changed, and it is only required to directly adhere the electrochromic film to the existing architecture, and electrically connect the electrochromic film to a circuit board in the intelligent wearable product, so that manufacturing costs are low. 
     In a possible implementation, the transparent cover and the body are integrated to form an integrated structure, or the transparent cover is fastened to the body through adhering. The body and the transparent cover may be integrated to form an integrated structure by using a two-color molding process, and a material of the body portion is different from a material of the transparent cover. In another implementation, the transparent cover may be a separate part and is fixedly connected to the through-hole of the body through adhering, and a part of the transparent cover is accommodated inside the through-hole. In addition, the outer surface of the transparent cover and the outer surface of the body share are coplanar, and may jointly form a flat surface or may jointly form an arc surface. 
     In a possible implementation, the electrochromic film and the transparent cover are integrated to form an integrated structure. The electrochromic film is integrated with the transparent cover to facilitate installation, so that an assembly process between the electrochromic film and the transparent cover is omitted. 
     In a possible implementation, a specific architecture in which the electrochromic film is integrated with the transparent cover may be as follows: The electrochromic film is located on the outer surface of the transparent cover, that is, the transparent cover and the electrochromic film are stacked. In addition, when the transparent cover and the electrochromic film are assembled on the housing, the transparent cover shields an outer surface of the electrochromic film. Alternatively, the electrochromic film is embedded inside the transparent cover. To be specific, the electrochromic film forms an intermediate layer of the transparent cover by using an integrated molding technology, and both sides of the electrochromic film are protected by transparent materials. 
     In a possible implementation, the power supply circuit is disposed on the circuit board in the intelligent wearable product, and the electrochromic film is electrically connected to the circuit board in the intelligent wearable product by using a spring plate. When the functional component works, the electrochromic film is powered on. The electrochromic film may be electrically connected to the power supply circuit on the circuit board in the intelligent wearable product. The power supply circuit separately supplies power to the functional component and the electrochromic film, and may simultaneously supply power to both of the functional component and the electrochromic film. The electrochromic film may be electrically connected to the functional component. When the functional component is powered on, power may also be supplied to the electrochromic film. 
     In a possible implementation, the functional component is a heart rate detection apparatus, and the functional component includes two photodiodes and two light emitting components. The functional component irradiates a blood vessel of a human body by using the photodiode and the light emitting component, to detect a heart rate of the human body. The light emitting component may be an LED. There are four transparent portions that respectively correspond to the two photodiodes and the two light emitting components. There is one electrochromic film that shields the four transparent portions. In this implementation, an electrochromic film with a relatively large size simultaneously shields four transparent portions, so that an adhering process is simple and is easy to operate, thereby reducing working time. 
     Specifically, the power supply circuit is disposed on the circuit board in the intelligent wearable product. The electrochromic film includes four power supply ports, the four power supply ports are separately electrically connected to the circuit board in the intelligent wearable product by using a spring plate, and the four power supply ports are electrically connected to the two photodiodes and the two light emitting components in a one-to-one correspondence manner. 
     In a possible implementation, the functional component is a heart rate detection apparatus, and the functional component includes two photodiodes and two light emitting components (which may be specifically LEDs). There are four transparent portions that respectively correspond to the two photodiodes and the two light emitting components. There are four electrochromic films, and the four electrochromic films respectively shield the four transparent portions. In this implementation, four electrochromic films with a relatively small size are configured, and the four electrochromic films are respectively adhered to the four transparent portions. Although an adhering process is slightly complex, materials of the electrochromic films can be reduced, and costs of raw materials can be reduced. 
     Specifically, each electrochromic film includes one power supply port. The power supply ports of the two electrochromic films are respectively electrically connected to the two photodiodes, and the power supply ports of the other two electrochromic films are respectively electrically connected to the two light emitting components. 
     In a possible implementation, a coating layer is disposed on the outer surface of the housing, and the coating layer is combined with the housing to enhance an appearance integration effect of the intelligent wearable product. 
     In a possible implementation, a boss protruded outside is disposed in a center region of the housing. The boss is configured to contact with a human body, and a material of the boss is transparent. The transparent portion is disposed on the boss, a light-shielding layer is disposed on an inner surface of the boss. The light-shielding layer surrounds the transparent portion, and the coating layer covers an outer surface of the boss. The light-shielding layer is disposed on the inner surface of the boss to form the transparent portion, and a region that is not shielded by the light-shielding layer is the transparent portion. Specifically, four transparent portions are disposed on the boss, and are all circular. The light-shielding layer is ink, and a color of the ink and a non-transparent region on the outer surface of the housing jointly present an integrated visual effect. 
     In a possible implementation, the intelligent wearable product is a watch. The functional component is a heart rate detection apparatus disposed in the watch, and detects a heart rate of a human body through a light transmission hole on a housing of the watch. In another possible implementation, the intelligent wearable product may be a smart ring, smart glasses, or the like. The functional component may be a photographing apparatus or another parameter detection apparatus. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a front three-dimensional schematic diagram of an intelligent wearable product according to an implementation of this application; 
         FIG.  2    is a back three-dimensional schematic diagram of an intelligent wearable product according to an implementation of this application; 
         FIG.  3    is a three-dimensional schematic exploded diagram of an intelligent wearable product according to an implementation of this application; 
         FIG.  4    is a schematic diagram of a cross-section of a bottom housing of an intelligent wearable product according to an implementation of this application; 
         FIG.  5    is a schematic diagram of a circuit board in an intelligent wearable product according to an implementation of this application; 
         FIG.  6    is a schematic diagram of an electrochromic film in an intelligent wearable product according to an implementation of this application; 
         FIG.  7    is a schematic diagram of an electrochromic film in an intelligent wearable product according to an implementation of this application; 
         FIG.  8    is a schematic diagram in a direction of a bottom housing when an intelligent wearable product is in a non-wearing state according to an implementation of this application; 
         FIG.  9    is a schematic diagram in a direction of a bottom housing when an intelligent wearable product is in a working state according to an implementation of this application; and 
         FIG.  10    is a schematic diagram of a function of an intelligent wearable product according to an implementation of this application. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A specific implementation of this application is clearly described below with reference to the accompanying drawings. 
     As shown in  FIG.  1   ,  FIG.  2   , and  FIG.  3   , in a specific implementation, an intelligent wearable product provided in this application is a smart watch. An intelligent wearable product  100  includes a housing  10 , and enclosure space is formed inside the housing  10  to accommodate electronic components such as a circuit board  20  and a functional component  22  and a mechanical structure of the intelligent wearable product  100 . The housing  10  includes a watch face  11 , a middle frame  12 , and a bottom housing  13  that jointly form the enclosure space. When the intelligent wearable product  100  is worn on a human body, the watch face  11  is configured to provide an operation interface and a visible window for a user to view, and the bottom housing  13  is configured to contact with a wrist of the human body. A transparent portion  131  is disposed on the bottom housing  13 . 
     A functional component  22  and a power supply circuit  21  are disposed on the circuit board  20  in the intelligent wearable product  100 . The functional component is configured to collect a parameter of a human body. Specifically, the functional component  22  is a heart rate detection apparatus, and light of the functional component  22  passes through the transparent portion  131  to collect information about the human body. 
     The intelligent wearable product provided in this application further includes an electrochromic film  40 , and the electrochromic film  40  is disposed on an inner surface (which is specifically an inner surface of the bottom housing  13 ) of the housing  10  and shields the transparent portion  131 . The power supply circuit  21  is configured to supply power to the electrochromic film  40  and the functional component  22 . Specifically, the power supply circuit  21  may be a processor on the circuit board  20 , and the power supply circuit  21  is electrically connected to the functional component  22  by using a cable inside the circuit board or by using an FPC. The electrochromic film  40  is configured to be transparent when the functional component  22  works, and present an integrated visual effect together with the housing  10  when the intelligent wearable product  100  is not worn on a human body. The integrated visual effect means that colors are the same or colors are different, but color collocation has an integrated effect. A presented visual effect is that the electrochromic film  40  and the housing  10  are mixed together, and the transparent portion  131  is invisible. 
     Specifically, the electrochromic film  40  is located on the inner surface of the bottom housing  13 . Referring to  FIG.  3   , the bottom housing  13  includes a body  132  and a transparent cover  134 . The body  132  is provided with a through-hole  1321 , and the transparent cover  134  is connected to the body  132  and shields the through-hole  1321 , to form the transparent portion  131 , that is, the transparent cover  134  serves as a part of the bottom housing  13  in the transparent portion  131  to shield an internal component of the intelligent wearable product. The transparent cover  134  and the body  132  may be integrated to form an integrated structure, for example, may be integrated to form an integrated structure by using a two-color molding process. In the implementation shown in  FIG.  3   , the transparent cover  134  is a separate part and is fixedly connected to the through-hole  1321  of the body  132  through adhering, and a part of the transparent cover  134  is accommodated inside the through-hole  1321 . In addition, an outer surface of the transparent cover  134  and an outer surface of the body  132  are coplanar, and may jointly form a flat surface or may jointly form an arc surface. A material of the body portion  132  may be different from a material of the transparent cover  134 , for example, the body is made of a metal material, and the transparent cover is made of a plastic material. 
     As shown in  FIG.  4   , the bottom housing  132  includes a boss  1324  and a peripheral region  1323  surrounding the boss  1324 . The boss  1324  is disposed protruding outside from a center region of an outer surface of the bottom housing  132 . The boss  1324  is configured to contact with a human body, a material of the boss  1324  is transparent, and the transparent portion  131  is formed on the boss  1324 . Specifically, a light-shielding layer  136  is disposed on an inner surface of the boss  1324  to form the transparent portion  131 , and a region surrounded by the light-shielding layer  136  forms the transparent portion  131 . A coating layer  15  covers an outer surface of the boss  1324 . The light-shielding layer  136  is disposed on the inner surface of the boss  1324 , and the light-shielding layer  136  is in a light-shielding state. The light-shielding layer  136  is provided with a through-hole, and the boss  1324  at a location of the through-hole is not shielded by the light-shielding layer  136 , so that this region forms the transparent portion  131 . Specifically, four transparent portions  131  are disposed on the boss  1324 , and are all circular. The light-shielding layer  136  is ink, and a color of the ink and a non-transparent region (which may be understood as the peripheral region  1323 ) on the outer surface of the bottom housing  13  jointly present an integrated visual effect. A shape of the transparent portion  131  may be a square, a triangle, an irregular shape, or the like. Under action of the electrochromic film  40 , when the intelligent wearable product  100  is not worn, the transparent portion  131  is invisible. Therefore, parameters (a shape and a size) of the transparent portion  131  do not need to be designed very fine, provided that the transparent portion  131  has a light transmission function. In this way, manufacturing costs of the transparent portion  131  on the bottom housing  13  can be reduced due to existence of the electrochromic film  40 . 
     As shown in  FIG.  2    and  FIG.  3   , there are four transparent portions  131  that are arranged in two rows and two columns. As shown in  FIG.  5   , the functional component  22  includes two photodiodes  221  and two light emitting components  222 . The light emitting components  222  are specifically LED lamps. Two transparent portions  131  are respectively disposed opposite to two photodiodes  221 , and the other two transparent portions  131  are respectively disposed opposite to two light emitting components  222 . Light of the light emitting component  222  passes through the transparent portion  131  to collect a heart rate of a human body by using the photodiode  221 . 
     As shown in  FIG.  3    and  FIG.  4   , the coating layer  15  is disposed on the outer surface of the bottom housing  13 , and the coating layer  15  is combined with the bottom housing  132  to enhance an appearance integration effect of the intelligent wearable product  100 . 
     The electrochromic film  40  may be an element independent of the housing  10 , and the electrochromic film  40  is adhered to the inner surface of the bottom housing. The electrochromic film  40  may alternatively be integrated with the bottom housing  13 . 
     In a possible implementation, the electrochromic film  40  is adhered to an inner surface of the transparent cover  134 , and the outer surface of the transparent cover  134  and the outer surface of the body  132  jointly form an integrated outer surface. In this implementation, the electrochromic film  40  and the transparent cover  134  are structures independent of each other. The electrochromic film  40  may be adhered to the inner surface of the transparent cover  134  by using glue. In this implementation, an existing housing structure of the intelligent wearable product  100  does not need to be changed, and it is only required to directly adhere the electrochromic film  40  to the existing housing architecture, and electrically connect the electrochromic film  40  to the circuit board in the intelligent wearable product, so that manufacturing costs are low. 
     In another possible implementation, the electrochromic film  40  and the transparent cover  134  are integrated to form an integrated structure. The electrochromic film  40  is integrated with the transparent cover  134  to facilitate installation, so that an assembly process between the electrochromic film  40  and the transparent cover  134  is omitted. 
     A specific architecture in which the electrochromic film  40  is integrated with the transparent cover  134  may be as follows: The electrochromic film  40  is located on the outer surface of the transparent cover  134 , that is, the transparent cover  134  and the electrochromic film  40  are stacked. In addition, when the transparent cover  134  and the electrochromic film  40  are assembled on the body  132  of the housing  10 , the transparent cover  134  shields an outer surface of the electrochromic film  40 . In another implementation, the electrochromic film  40  is embedded inside the transparent cover  134 . To be specific, the electrochromic film  40  forms an intermediate layer of the transparent cover  134  by using an integrated molding technology, and both sides of the electrochromic film  40  are protected by transparent materials. This helps prolong a service life of the electrochromic film  40  and can thin an overall size. It may be understood that the transparent material of the transparent cover  134  also acts as a protective layer of the electrochromic film  40 , so that the electrochromic film  40  does not need its own protective layer structure any longer. 
     As shown in  FIG.  3    and  FIG.  5   , serving as a mainboard of the intelligent wearable product, the circuit board  20  carries most of internal components. The circuit board  20  is stacked between the bottom housing  13  and the watch face  11 , and the functional component  22  and an electrical connection piece  24  are disposed on a surface that is of the circuit board  20  and that faces the bottom housing  13 . The electrical connection piece  24  is configured to electrically connect to the electrochromic film  40 . Specifically, the electrical connection piece  24  is a spring plate and has a conductive function; or the electrical connection piece  24  is a metal spring plate with one end fastening on the circuit board  20  through welding. The electrical connection piece  24  is electrically connected to the power supply circuit  21  by using a cable inside the circuit board  20 . A spring end of the spring plate is configured to abut against a power supply port of the electrochromic film  40 . In this implementation, there are four electrical connection pieces  24 , the four electrical connection pieces  24  form a square region, and the functional component  22  is disposed inside the square region. The electrical connection piece  24  is electrically connected to the power supply circuit on the circuit board by using the cable inside the circuit board, or is electrically connected to the functional component  22 . The power supply circuit may also supply power to the functional component  22 . 
     In another implementation, the electrochromic film  40  may be electrically connected to an electrical connection point on the circuit board  20  by using a conducting wire or an FPC. The electrical connection point may be a pad or may be a connector. 
     As shown in  FIG.  6   , there may be one electrochromic film  40 , that is, an electrochromic film  40  with a relatively large size is used to simultaneously shield the four transparent portions  131 , so that an adhering process is simple and is easy to operate, thereby reducing working time. The electrochromic film  40  with a relatively large size includes four power supply ports  42 , and the four power supply ports  42  are distributed in four corners of the electrochromic film  40 . 
     As shown in  FIG.  7   , it may be understood that there may be four electrochromic films  40 , and the four electrochromic films  40  respectively shield the four transparent portions  131 . In this implementation, four electrochromic films  40  with a relatively small size are configured, and the four electrochromic films  40  are respectively adhered to the four transparent portions  131 . Although an adhering process is slightly complex, materials of the electrochromic films  40  can be reduced, and costs of raw materials can be reduced. In this implementation, each electrochromic film  40  includes a power supply port  42 , and the power supply port  42  is located in a corner of the electrochromic film  40 . The four electrochromic films  40  jointly form a square region, and the four power supply ports  42  are distributed in four corners of the square region. 
     Specifically, the power supply port  42  is in an arc-surface shape, and an abutting surface between the power supply port  42  and the spring plate is an arc surface, to enlarge a contact area between the power supply port  42  and the spring plate, thereby improving stability of electrical connection between the electrochromic film  40  and the circuit board. 
     In this application, under action of an electric field, the electrochromic film  40  implements a reversible change between a color and transparency. When the intelligent wearable product  100  is not worn on a human body, as shown in  FIG.  8   , the functional component  22  does not work, the electrochromic film  40  is not powered on, the electrochromic film  40  is visible in the transparent portion  131 , and the transparent portion  131  in invisible from an outer surface of the intelligent wearable product  100 . In other words, the electrochromic film  40  and the housing  10  jointly present an integrated visual effect in this case. A color of the electrochromic film  40  and a color of an outer surface of the housing  10  may be a same color or may be different colors, but the integrated visual effect can still be presented, for example, a gradual change between two colors. When the functional component  22  works (that is, when the intelligent wearable product is worn on a human body), as shown in  FIG.  9   , the electrochromic film  40  is powered on and becomes to be in a transparent color, and a function of the transparent portion  131  is played in this case. The functional component  22  works normally, and collects a parameter of the human body by using the transparent portion  131 . This application can improve quality and appearance experience of the intelligent wearable product  100 , and improve competitiveness of the intelligent wearable product  100 . 
     In a state in which the electrochromic film  40  is not powered on, the electrochromic film  40  and the outer surface of the housing  10  are in a same color system. A limitation of the same color system includes: The color of the electrochromic film  40  is the same as the color of the outer surface of the housing  10 , for example, both are black or have another color. The same system may also mean that the color of the electrochromic film  40  and the color of the outer surface of the housing  10  are different colors but belong to a same color system. Similar colors in a same color system may be combined together, so that the outer surface of the housing  10  has an integrated visual sensation. 
       FIG.  10    is a block diagram of a function of the wearable device  100  shown in  FIG.  1    and  FIG.  2   . 
     In an implementation, the wearable device  100  may include one or more input apparatuses  102 , one or more output apparatuses  104 , and a processor  106 . Generally, the input apparatus  102  may detect various types of inputs, and the output apparatus  104  may provide various types of outputs. The processor  106  may receive an input signal from the input apparatus  102  and make a corresponding response to the input signal. For example, the processor  106  may interpret the input signal received from the one or more input apparatuses  102 , generate an output signal, and transmit the output signal to the one or more output apparatuses  104 . The output signal enables the output apparatus  104  to provide one or more outputs. The input detected at the one or more input apparatuses  102  may be used to implement one or more functions of the wearable device  100 . In some cases, the one or more output apparatuses  104  may be configured to provide an output that is manipulated depending on or responding to the input detected by the one or more input apparatuses  102 . The output provided by the one or more output apparatuses  104  may also respond to a program or an application program executed by the processor  106  and/or an associated apparatus, or may be started by the program or the application program. 
     In various embodiments, the input apparatus  102  may include any suitable component configured to detect an input. Instances of the input apparatus  102  include an audio sensor (for example, a microphone), an optical or visual sensor (for example, a camera, a visible light sensor, or an invisible light sensor), a proximity sensor, a touch sensor, a touchscreen, a force sensor, a mechanical apparatus (for example, a crown, a switch, a button, or a key), a vibration sensor, an orientation sensor, a motion sensor (for example, an accelerometer or a speed sensor), a location sensor (for example, a global positioning system apparatus), a thermal sensor, a communications apparatus (for example, a wired or wireless communications apparatus), a resistance sensor, a magnetic sensor, an electroactive polymer (EAP), a strain gauge, an electrode, or some combinations thereof. Each input apparatus  102  may be configured to detect one or more specific types of inputs and provide a signal (for example, an input signal) corresponding to a detected input. For example, the signal may be provided to the processor  106 . 
     The output apparatus  104  may include any suitable component configured to provide an output. Instances of the output apparatus  104  include an audio output apparatus (for example, a speaker), a visual output apparatus (for example, a lamp or a display), a tactile output apparatus (for example, a tactile output apparatus), a communications apparatus (for example, a wired or wireless communications apparatus), or some combinations thereof. Each output apparatus  104  may be configured to receive one or more signals (for example, an output signal provided by the processor  106 ) and provide an output corresponding to the signal. 
     The processor  106  may be operably coupled to the input apparatus  102  and the output apparatus  104 . The processor  106  may be configured to exchange a signal with the input apparatus  102  and the output apparatus  104 . For example, the processor  106  may receive, from the input apparatus  102 , an input signal corresponding to an input detected by the input apparatus  102 . The processor  106  may interpret the received input signal to determine whether to provide and/or change one or more outputs to respond to the input signal. Then, the processor  106  may send an output signal to the one or more output apparatuses  104  to provide and/or change an output based on a requirement. In addition, the wearable device  100  may further include a memory  108  configured to store instructions and data. For example, the memory  108  may be a cache. The memory  108  may store instructions or data that has been used or is cyclically used by the processor  106 . If the processor  106  needs to use the instructions or the data again, the processor  106  may directly invoke the instructions or the data from the memory  108 . This avoids repeated access and reduces waiting time of the processor  106 , thereby improving working efficiency of the wearable device  100 . 
     In some embodiments, the input apparatus  102  may include a group of electrodes. The electrodes may be disposed on one or more outer surfaces of the wearable device  100 . The processor  106  may monitor a voltage or signal received at least one electrode. In some embodiments, one of the electrodes may be coupled to an apparatus permanently or in a switchable manner, to be grounded. The electrode may be configured to provide an electrocardiogram (ECG) function for the wearable device  100 . For example, when a user of the wearable device  100  is in contact with a first electrode and a second electrode that receive a signal from the user, a 2-lead ECG function may be provided. In another instance, when the user of the wearable device  100  is in contact with the first electrode and the second electrode that receive a signal from the user and a third electrode that grounds the user to the wearable device  100 , a 3-lead ECG function may be provided. In the embodiments of the 2-lead ECG and the 3-lead ECG, users may press the first electrode against first portions of their bodies of the user and press the second electrode against second portions of their bodies. Depending on a location of the third electrode on the wearable device  100 , the third electrode may be pressed against the first or second body portion. 
     The foregoing descriptions are merely some embodiments and implementations of this application, but are not intended to limit the protection scope of this application. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed in the present invention shall fall within the protection scope of the present invention.