Wearable device and antenna control method

Abstract

The present application relates to the technical field of virtual reality, and particularly relates to a wearable device and an antenna control method. The wearable device comprises a handle and a head-mounted display, the head-mounted display comprising a first antenna, the first antenna comprising a first feed point and a second feed point, the handle comprising a second antenna, and the second antenna comprising a third feed point and a fourth feed point, wherein a first target pattern is generated when the first antenna is fed via a first target feed point among the first feed point and the second feed point, a second target pattern is generated when the second antenna is fed via a second target feed point among the third feed point and the fourth feed point, and an antenna radiation range indicated by the first target pattern at least partially overlaps with an antenna radiation range indicated by the second target pattern. In this way, a pattern of the head-mounted display can be kept aligned with an antenna pattern of the handle, thereby maintaining good communication quality between the head-mounted display and the handle.

Description

A wearable device and antenna control method

[0001] This application claims priority to Chinese Patent Application No. 202410292401.2, filed on March 13, 2024, entitled “A Wearable Device and Antenna Control Method”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of virtual reality technology, specifically to a wearable device and an antenna control method. Background Technology

[0003] Wearable devices for virtual reality (VR) and mixed reality (MR) typically consist of a head-mounted display (HUD) and controllers. Wireless communication between the controllers and the HUD uses Bluetooth Low Energy (BLE) for lower latency. During use, arm and hand movements can change the relative position of the HUD and controllers, leading to a deterioration of the wireless connection and affecting the BLE signal quality between them. Summary of the Invention

[0004] To address the aforementioned issues, embodiments of this application provide a wearable device and an antenna control method.

[0005] In a first aspect, this application provides a wearable device, including a handle and a head-mounted display. The head-mounted display includes a first antenna, which includes a first feed point and a second feed point. The handle includes a second antenna, which includes a third feed point and a fourth feed point. The first antenna generates a first target radiation pattern when fed through a first target feed point among the first and second feed points. The second antenna generates a second target radiation pattern when fed through a second target feed point among the third and fourth feed points. The antenna radiation range indicated by the first target radiation pattern at least partially overlaps with the antenna radiation range indicated by the second target radiation pattern.

[0006] In this application, the first antenna can be the BLE antenna 1011 mentioned later, the first feed point can be feed point A1 mentioned later, and the second feed point can be feed point A2 mentioned later; the second antenna can be the BLE antenna 1021 on the left handle or the BLE antenna 1031 on the right handle mentioned later, the third feed point can be feed point B1 mentioned later, and the fourth feed point can be feed point B2 mentioned later. When the first target feed point is feed point A1 and the second target feed point is feed point B1, the first target radiation pattern generated when the first antenna is fed through the first target feed point can be radiation pattern A11 mentioned later, and the second target radiation pattern generated when the second antenna is fed through the second target feed point can be radiation pattern B11 mentioned later.

[0007] In the embodiments of this application, the fact that the antenna radiation range indicated by the first target radiation pattern and the antenna radiation range indicated by the second target radiation pattern at least partially overlap indicates that the first target radiation pattern and the second target radiation pattern are aligned.

[0008] It is understandable that when two antennas communicate, if their radiation patterns are aligned, the communication between the antennas can achieve low link loss and high signal quality; if the radiation patterns of the two antennas are not aligned (i.e. mismatch), the link loss between the antennas increases, resulting in deteriorated signal quality and inability to communicate normally.

[0009] In this way, the wearable device controls the first antenna of the head-mounted display to be fed through the first target feed point, and the second antenna of the control handle to be fed through the second target feed point, so that the radiation pattern of the head-mounted display and the antenna radiation pattern of the handle can be kept aligned, thereby maintaining good communication quality between the head-mounted display and the handle.

[0010] In one possible implementation of the first aspect described above, the wearable device uses six degrees of freedom positioning information from the head-mounted display and the handle to determine a first target power supply point and a second target power supply point, wherein the six degrees of freedom positioning information includes relative position information and rotation angle information.

[0011] In this application, the wearable device can utilize technologies such as six degrees of freedom (6DOF) three-dimensional magnetic positioning to obtain 6DOF positioning information of the head-mounted display and the controller, thereby achieving real-time mutual positioning between the head-mounted display and the controller. The six degrees of freedom (6DOF) include six degrees of freedom: three translational degrees of freedom and three rotational degrees of freedom. The translational degrees of freedom include forward / backward, left / right, and up / down movement, while the rotational degrees of freedom include rotation around the X, Y, and Z axes.

[0012] In some embodiments, the wearable device can also determine the motion trend of the head-mounted display or the handle based on six-degree-of-freedom positioning information, thereby determining the first target feed point and the second target feed point.

[0013] In one possible implementation of the first aspect described above, the head-mounted display and the handle are each equipped with a positioning module, which determines the six degrees of freedom positioning information of the head-mounted display and the handle based on electromagnetic signals.

[0014] In this embodiment, the positioning module on the head-mounted display can be the head-mounted display positioning module mentioned later, and the positioning module on the controller can be the controller positioning module mentioned later. The 6DoF positioning module mentioned in this application can include the head-mounted display positioning module and the controller positioning module.

[0015] In one possible implementation of the first aspect above, the handle includes a first positioning module, which includes a signal generator, a digital-to-analog converter, a switching unit, a first signal amplification unit, and a triaxial transmitting coil connected in sequence; wherein, the signal generator is used to send electromagnetic signals, which pass through the digital-to-analog converter, the switching unit, and the first signal amplification unit in sequence, and are then emitted by the triaxial transmitting coil.

[0016] In this application, the first positioning module may be the positioning module 5011 mentioned below.

[0017] In one possible implementation of the first aspect described above, the head-mounted display includes a second positioning module, which includes an analog-to-digital conversion unit, a second signal amplification unit, and a three-axis receiving coil connected in sequence. The three-axis receiving coil is used to detect the induced electromotive force generated by the electromagnetic signal, and the induced electromotive force is processed by the second signal amplification unit and the analog-to-digital conversion unit in sequence to determine the six-degree-of-freedom positioning information of the head-mounted display and the handle.

[0018] In this application, the second positioning module may be the positioning module 5012 mentioned below.

[0019] In one possible implementation of the first aspect described above, the head-mounted display includes a first positioning module, which includes a signal generator, a digital-to-analog converter, a switching unit, a first signal amplification unit, and a triaxial transmitting coil connected in sequence; wherein the signal generator is used to transmit electromagnetic signals, which pass through the digital-to-analog converter, the switching unit, and the first signal amplification unit in sequence, and are transmitted by the triaxial transmitting coil.

[0020] In one possible implementation of the first aspect described above, the handle includes a second positioning module, which includes an analog-to-digital conversion unit, a second signal amplification unit, and a three-axis receiving coil connected in sequence; wherein, the three-axis receiving coil is used to detect the induced electromotive force generated by the electromagnetic signal, and the induced electromotive force is processed by the second signal amplification unit and the analog-to-digital conversion unit in sequence to determine the six-degree-of-freedom positioning information of the head-mounted display and the handle.

[0021] It is understandable that when the head-mounted display includes a second positioning module and the handle includes a first positioning module, the wearable device can achieve positioning of the head-mounted display on the handle; when the head-mounted display includes a first positioning module and the handle includes a second positioning module, the wearable device can achieve positioning of the handle on the head-mounted display; when both the head-mounted display and the handle include both a first positioning module and a second positioning module, the wearable device can achieve mutual positioning of the head-mounted display and the handle.

[0022] In one possible implementation of the first aspect described above, the electromagnetic signal is a periodic signal, wherein at least two periodic signals in the electromagnetic signal have different amplitudes.

[0023] It is understandable that when the electromagnetic signal is a periodic signal, the power consumption of the positioning module can be reduced. For example, within the periodic time T, an electromagnetic signal with a constant amplitude can be transmitted for the first T / 2 time period, and no electromagnetic signal can be transmitted for the latter T / 2 time period, thereby reducing the power consumption of the positioning module.

[0024] In this embodiment, the amplitude of the electromagnetic signal can be adjusted according to the distance between the handle and the head-mounted display. When the distance between the handle and the head-mounted display is different, the amplitude of the periodic signal in the electromagnetic signal corresponding to that distance is also different.

[0025] In one possible implementation of the first aspect above, each periodic signal in the electromagnetic signal has a prefix signal, and the prefix signal of each periodic signal has the same amplitude and frequency as the periodic signal.

[0026] In this embodiment, the positioning module can encode electromagnetic signals of different amplitudes, for example, by sending a short prefix signal of the same frequency and amplitude before each periodic signal. Since the prefix signal of each periodic signal has the same amplitude and frequency as the periodic signal, the amplitude of the periodic signal following the prefix signal can be determined based on the amplitude of the prefix signal.

[0027] In one possible implementation of the first aspect above, the amplitude of the first periodic signal in the electromagnetic signal is greater than the amplitude of the second periodic signal, and the first periodic signal has a first prefix signal, the second periodic signal has a second prefix signal, wherein the time interval between the first prefix signal and the first periodic signal is less than the time interval between the second prefix signal and the second periodic signal.

[0028] In this embodiment of the application, the first periodic signal may be the electromagnetic signal in the signal shown in the T2 part mentioned later, and the first prefix signal may be the prefix signal in the signal shown in the T2 part mentioned later; the second periodic signal may be the electromagnetic signal in the signal shown in the T1 part mentioned later, and the second prefix signal may be the prefix signal in the signal shown in the T1 part mentioned later.

[0029] In this way, by adjusting the amplitude of the electromagnetic signal according to the distance between the handle and the head-mounted display, and encoding different signal amplitudes, the power consumption of the positioning module can be reduced without affecting the positioning accuracy.

[0030] In one possible implementation of the first aspect described above, the first antenna generates a first radiation pattern when fed through a first feed point, and generates a second radiation pattern when fed through a second feed point; the antenna radiation range indicated by the first radiation pattern and the antenna radiation range indicated by the second radiation pattern do not overlap at least partially.

[0031] In this application, when the first antenna is fed through the first feed point, the first radiation pattern generated can be radiation pattern A11, and when the first antenna is fed through the second feed point, the second radiation pattern generated can be radiation pattern A21.

[0032] It can be understood that the fact that the antenna radiation range indicated by the first radiation pattern does not overlap with the antenna radiation range indicated by the second radiation pattern at least partially indicates that the first radiation pattern and the second radiation pattern are complementary.

[0033] In one possible implementation of the first aspect described above, a third radiation pattern is generated when the second antenna is fed through a third feed point, and a fourth radiation pattern is generated when the second antenna is fed through a fourth feed point; the antenna radiation range indicated by the third radiation pattern and the antenna radiation range indicated by the fourth radiation pattern do not overlap at least partially.

[0034] In this application, when the second antenna is fed through the third feed point, the generated third directional pattern can be directional pattern B11, and when the second antenna is fed through the fourth feed point, the generated fourth directional pattern can be directional pattern B21.

[0035] It can be understood that if the antenna radiation range indicated by the third-direction pattern does not overlap with the antenna radiation range indicated by the fourth-direction pattern at least partially, it means that the third-direction pattern and the fourth-direction pattern are complementary.

[0036] Secondly, this application provides an antenna control method applied to a wearable device, the wearable device including a handle and a head-mounted display, the head-mounted display including a first antenna including a first feed point and a second feed point, the handle including a second antenna including a third feed point and a fourth feed point, the method including: determining a first target feed point from the first feed point and the second feed point, determining a second target feed point from the third feed point and the fourth feed point; controlling the first antenna to feed through the first target feed point, and controlling the second antenna to feed through the second target feed point;

[0037] The first antenna generates a first target radiation pattern when fed through the first target feed point, and the second antenna generates a second target radiation pattern when fed through the second target feed point. The antenna radiation range indicated by the first target radiation pattern and the antenna radiation range indicated by the second target radiation pattern at least partially overlap.

[0038] In one possible implementation of the second aspect described above, determining the first target feed point from the first feed point and the second feed point, and determining the second target feed point from the third feed point and the fourth feed point, includes: determining the first target feed point and the second target feed point based on the six-degree-of-freedom positioning information of the head-mounted display and the handle, wherein the six-degree-of-freedom positioning information includes relative position information and rotation angle information.

[0039] In one possible implementation of the second aspect above, the method further includes: determining the six-degree-of-freedom positioning information of the head-mounted display and the handle based on the electromagnetic signals between the head-mounted display and the handle.

[0040] In one possible implementation of the second aspect above, the electromagnetic signal is a periodic signal, wherein at least two periodic signals in the electromagnetic signal have different amplitudes.

[0041] In one possible implementation of the second aspect above, each periodic signal in the electromagnetic signal has a prefix signal, and the prefix signal of each periodic signal has the same amplitude and frequency as the periodic signal.

[0042] In one possible implementation of the second aspect above, the amplitude of the first periodic signal in the electromagnetic signal is greater than the amplitude of the second periodic signal, and the first period has a first prefix signal, the second period has a second prefix signal, wherein the time interval between the first prefix signal and the first periodic signal is less than the time interval between the second prefix signal and the second periodic signal.

[0043] The beneficial effects of the second aspect mentioned above can be referred to in the relevant descriptions of the first aspect and its various possible implementations, and will not be repeated here. Attached Figure Description

[0044] Figure 1 shows a schematic diagram of a wearable device 10 provided in an embodiment of this application;

[0045] Figure 2 shows a schematic diagram of the antenna architecture of a wearable device 20 provided in an embodiment of this application;

[0046] Figure 3 shows a schematic diagram of the antenna architecture of another wearable device 30 provided in an embodiment of this application;

[0047] Figure 4A shows a schematic diagram of a scenario where an arm swings to the opposite side (i.e., the handle swings from one side of the head-mounted display to the other side) according to an embodiment of this application.

[0048] Figure 4B shows a schematic diagram of a scenario where an arm swings behind the head (i.e., the handle is on the back of the head-mounted display) according to an embodiment of this application.

[0049] Figure 4C shows a schematic diagram of a scenario where a human hand rotates (i.e., the handle rotates) according to an embodiment of this application;

[0050] Figure 5A shows a schematic diagram of the antenna pattern of a wearable device 20 in the scenario shown in Figure 4A, according to an embodiment of this application.

[0051] Figure 5B shows a schematic diagram of the antenna pattern of a wearable device 20 in the scenario shown in Figure 4B, according to an embodiment of this application.

[0052] Figure 5C shows a schematic diagram of the antenna pattern of a wearable device 20 in the scenario shown in Figure 4C, according to an embodiment of this application.

[0053] Figure 6 shows a schematic diagram of the antenna pattern of a wearable device 10 provided in an embodiment of this application;

[0054] Figure 7 illustrates the system architecture of a wearable device 10 provided in an embodiment of this application;

[0055] Figure 8A shows a schematic diagram of a positioning module 5011 provided in an embodiment of this application;

[0056] Figure 8B shows a schematic diagram of a positioning module 5012 provided in an embodiment of this application;

[0057] Figure 9 shows a schematic diagram of an electromagnetic signal provided in an embodiment of this application;

[0058] Figure 10 shows a schematic diagram of the radio frequency path in a wearable device 10 provided in an embodiment of this application;

[0059] Figure 11A shows a schematic diagram of a head-mounted display in a wearable device 10 provided in an embodiment of this application;

[0060] Figure 11B shows a schematic diagram of the BLE antenna pattern of a wearable device 10 provided in an embodiment of this application;

[0061] Figure 11C shows a schematic diagram of a handle in a wearable device 10 provided in an embodiment of this application;

[0062] Figure 11D shows a schematic diagram of the BLE antenna pattern of the handle in a wearable device 10 according to an embodiment of this application;

[0063] Figure 12 shows a flowchart of an antenna control method provided in an embodiment of this application;

[0064] Figure 13A shows a schematic diagram of the antenna pattern of a wearable device 10 in the scenario shown in Figure 4A, according to an embodiment of this application.

[0065] Figure 13B shows a schematic diagram of the communication gain of a wearable device 10 in the scenario shown in Figure 4A, according to an embodiment of this application.

[0066] Figure 14A shows a schematic diagram of the antenna pattern of a wearable device 10 in the scenario shown in Figure 4B, according to an embodiment of this application.

[0067] Figure 14B shows a schematic diagram of the communication gain of a wearable device 10 in the scenario shown in Figure 4B, according to an embodiment of this application.

[0068] Figure 15A shows a schematic diagram of the antenna pattern of a wearable device 10 in the scenario shown in Figure 4C, according to an embodiment of this application.

[0069] Figure 15B shows a schematic diagram of the communication gain of a wearable device 10 in the scenario shown in Figure 4C, according to an embodiment of this application. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0071] Referring to Figure 1, which is a schematic diagram of a wearable device 10 provided in an embodiment of this application, the wearable device 10 includes a head-mounted display 101, a left-hand controller 102, and a right-hand controller 103. The head-mounted display 101 includes a BLE antenna 1011, the left-hand controller 102 includes a BLE antenna 1021, and the right-hand controller 103 includes a BLE antenna 1031. The antenna 1011 operates in the 2.4 GHz band. The head-mounted display 101 also includes a wireless fidelity (Wi-Fi) antenna 1012, which also operates in the 2.4 GHz band. Therefore, there will be a scenario where the Wi-Fi antenna 1012 and the BLE antenna 1011 coexist on the same frequency, i.e., a scenario where the Wi-Fi antenna 1012 and the BLE antenna 1011 operate simultaneously. Furthermore, due to the size limitations of the headset 101, the distance between the Wi-Fi antenna 1012 and the BLE antenna 1011 is relatively short, causing strong co-channel interference to the BLE antenna 1011. In addition, the headset 101 includes cameras with different functions; when using the headset 101, all cameras remain on, causing interference within the operating frequency band of the BLE antenna 1011, increasing noise floor, and affecting the communication of the BLE antenna 1011. To reduce interference from co-channel antennas and cameras, it is necessary to improve the signal quality of BLE communication between the controller and the headset as much as possible, thereby ensuring the demodulation threshold signal-to-noise ratio and guaranteeing normal communication between the controller and the headset.

[0072] In some embodiments, as shown in FIG2, the wearable device 20 includes a head-mounted display 201, a left-hand controller 202, and a right-hand controller 203, and the head-mounted display 201, the left-hand controller 202, and the right-hand controller 203 all adopt a single BLE chip and a single BLE antenna architecture. For example, the head-mounted display 201 includes a BLE chip 2011 and a BLE antenna 2012, the left-hand controller 202 includes a BLE chip 2021 and a BLE antenna 2022, and the right-hand controller 203 includes a BLE chip 2031 and a BLE antenna 2032. The BLE antenna 2012 is generally located in the middle of the head-mounted display 201 and communicates with the BLE antennas 2022 and 2032 of the left and right controllers respectively through time slot switching.

[0073] In other embodiments, as shown in FIG3, the wearable device 30 includes a head-mounted display 301, a left handle 302, and a right handle 303. The head-mounted display 301 adopts a single BLE chip and dual BLE antenna architecture, while the left handle 302 and right handle 303 adopt a single BLE chip and single BLE antenna architecture. For example, the head-mounted display 301 includes a BLE chip 3011, a BLE antenna 3012, a BLE antenna 3013, and a switch 3014; the left handle 302 includes a BLE chip 3021 and a BLE antenna 3022; and the right handle 303 includes a BLE chip 3031 and a BLE antenna 3032. The BLE antennas 3012 and 3013 are located on the left and right sides of the head-mounted display 301, respectively, and antenna switching is achieved through the switch 3014. Specifically, the BLE antenna 3012 on the left side of the head-mounted display communicates with the BLE antenna 3022 on the left handle, and the BLE antenna 3013 on the right side of the head-mounted display communicates with the BLE antenna 3032 on the right handle.

[0074] It is understandable that antennas have directionality, meaning that an antenna's ability to radiate or receive electromagnetic waves varies depending on the direction. An antenna pattern is a diagram used to represent the antenna's directionality and reflects its radiation range. When the patterns of two antennas are aligned, the connection performance between the two antennas is better, and link loss is lower. Referring to Figure 2, the head-mounted display's BLE antenna 2012 has a pattern 201a, the BLE antenna 2022 on the left handle has a pattern 202a, and the BLE antenna 2032 on the right handle has a pattern 203a. Referring to Figure 3, the head-mounted display's BLE antenna 3012 has a pattern 301a, the BLE antenna 3013 has a pattern 301b, the BLE antenna 3022 on the left handle has a pattern 302a, and the BLE antenna 3032 on the right handle has a pattern 303a.

[0075] As shown in Figures 2 and 3, when the user holds the left and right controllers still on both sides of the body, the radiation pattern of the head-mounted display antenna is aligned with the radiation pattern of the controller antenna. At this time, the connection between the head-mounted display and the arm is relatively stable. However, when the user uses the controllers, the movement of the arm and hand will cause the relative position between the head-mounted display and the controller to change. For example, if the left controller moves to the right side of the body, the change in relative position will cause the radiation patterns of the head-mounted display and the controller to mismatch, which will lead to the deterioration of the wireless connection between the controller and the head-mounted display and affect the BLE antenna signal quality between the controller and the head-mounted display.

[0076] The following explanation, using the wearable device 20 shown in Figure 2 as an example, illustrates the reasons for the deterioration of the wireless connection between the head-mounted display and the controller in a specific scenario.

[0077] To facilitate the subsequent description, the directions indicated by the coordinate graphs in the various figures of this application will first be explained. In the various figures of this application, the X-axis direction represents the direction from the left to the right side of the human body, the Y-axis direction represents the direction from the back to the front of the human body, and the Z-axis direction represents the direction from the feet to the head of the human body. The X-axis, Y-axis, and Z-axis directions can be perpendicular to each other.

[0078] As shown in Figures 4A and 5A, in a scenario where the arm swings to the opposite side (i.e., the handle swings from one side of the head-up display to the other), taking the left handle as an example, when the left handle 202 moves to the right side of the head-up display 201, the BLE antenna 2022 of the left handle 202 moves from the region X<0 (e.g., the left side of the human body) to the region X>0 (e.g., the right side of the human body). The BLE antenna pattern 202a of the left handle 202 remains unchanged, still pointing to the upper right region, while the BLE antenna pattern 201a of the head-up display 201 points to the lower left to lower right region. As a result, the BLE antenna patterns of the head-up display 201 and the handle 202 may not align. At this time, the communication between the head-up display 201 and the left handle 202 will experience significant transmission loss, leading to a deterioration in the signal-to-noise ratio, which in turn causes the handle to freeze or disconnect, affecting the user experience.

[0079] As shown in Figures 4B and 5B, in a scenario where the arm is swung behind the head (i.e., the handle is behind the head-mounted display), taking the right-hand handle as an example, when the right-hand handle 203 moves to the back of the head-mounted display 201, the BLE antenna 2032 of the right-hand handle 203 moves from the region Y>0 to the region Y<0. The BLE antenna pattern 203a of the right-hand handle 203 remains unchanged, pointing to the upper left region in the figure, while the BLE antenna pattern 201a of the head-mounted display 201 points to the lower right region. As a result, the BLE antenna patterns of the head-mounted display 201 and the right-hand handle 203 may not align, leading to significant transmission loss in communication, resulting in a deterioration of the signal-to-noise ratio, and consequently, handle stuttering or disconnection, affecting the user experience.

[0080] As shown in Figures 4C and 5C, in a scenario where the user's hand rotates (i.e., the controller rotates), taking the left controller as an example, the BLE antenna pattern 202a of the left controller 202 points to the upper right area in the figure. When the user's hand rotates, the BLE antenna pattern 202a of the left controller 202 rotates to the right, pointing to the right area. However, the BLE antenna pattern 201a of the head-mounted display 201 points to the lower left to lower right area. Therefore, the BLE antenna pattern 202a of the left controller 202 and the BLE antenna pattern 201a of the head-mounted display 201 cannot be aligned, resulting in significant signal transmission loss, deterioration of the signal-to-noise ratio, and consequently, controller stuttering or disconnection, affecting the user experience.

[0081] To address the aforementioned problems, this application provides a wearable device comprising a handle and a head-mounted display (HUD). Both the HUD and the handle employ a multi-feed single antenna, meaning a single antenna has at least two feed points. Simultaneously, the antenna can be fed through either of these feed points to transmit and receive signals. Since different feed points can induce different current modes, the antenna exhibits different antenna patterns under different current modes. For example, referring to Figure 6, the HUD's BLE antenna 1011 has feed points A1 and A2. When fed through feed point A1, antenna 1011 induces current mode 1, which has a pattern A11. When fed through feed point A2, antenna 1011 induces current mode 2, which has a pattern A21. Patterns A11 and A21 indicate that antenna 1011 can radiate or receive electromagnetic waves in different directions. The radiation ranges indicated by Figure A11 and Radiation Pattern A21 may not overlap completely, or at least partially. The handle BLE antenna 1021 has feed points B1 and B2. When the antenna 1021 is fed through feed point B1, it can generate current mode 3, in which current mode 3 the antenna 1021 has radiation pattern B11. When the antenna 1021 is fed through feed point B2, it can generate current mode 4, in which current mode 4 the antenna 1021 corresponds to radiation pattern B21. Radiation patterns B11 and B21 are complementary. Therefore, the wearable device can detect the relative positional relationship between the handle and the head-mounted display, and adjust the feed points of the antennas in the head-mounted display and / or the handle according to the relative positional relationship, so that the antenna radiation patterns of the head-mounted display and the handle are kept aligned. For example, in a scenario where the arm swings to the opposite side as shown in Figure 4A, if the handle's BLE antenna 1021 moves from the region X<0 to the region X>0, the head-mounted display's BLE antenna 1011 can be fed through feed point A2, and the handle's BLE antenna 1021 can be fed through feed point B2, ensuring that the head-mounted display's radiation pattern A21 and the handle's radiation pattern B21 remain aligned. This increases the probability of the antenna patterns of the head-mounted display and the handle aligning, maintaining good communication quality between the handle and the head-mounted display even during user movement.

[0082] It is understandable that when two antennas communicate, if their radiation patterns are aligned, the communication between the antennas can achieve low link loss and high signal quality; if the radiation patterns of the two antennas are not aligned (i.e. mismatch), the link loss between the antennas increases, resulting in deteriorated signal quality and inability to communicate normally.

[0083] In some embodiments, both the headset and the controller can employ antenna combinations with pattern adjustment capabilities, such as dual antennas. The patterns of the antennas in the dual antennas are complementary; here, complementarity can mean that the patterns of the antennas radiate or receive electromagnetic waves in different directions, and the radiation ranges of the antennas can be completely non-overlapping, or at least partially non-overlapping. Simultaneously, the headset can select one of the dual antennas to communicate with one of the dual antennas of the controller. Therefore, the wearable device can adjust the antennas used for communication between the headset and the controller based on their relative positions, ensuring that the antenna patterns of the headset and the controller remain aligned.

[0084] It's understandable that the headset and controller use a multi-feed single antenna, requiring only one antenna to switch between different radiation patterns. The headset antenna or controller antenna can be excited with different antenna current modes by selecting the feed point, thus generating different radiation patterns. Compared to adjusting the radiation pattern by increasing the number of antennas to form an antenna combination, this approach is more conducive to achieving thinner and lighter wearable products and reduces costs.

[0085] In some embodiments, wearable devices can utilize technologies such as six degrees of freedom (6DoF) three-dimensional magnetic positioning to acquire 6DoF positioning information of the head-mounted display (HUD) and controllers, enabling real-time mutual positioning between the HUD and controllers. 6DoF includes six degrees of freedom: three translational degrees of freedom and three rotational degrees of freedom. Translational degrees of freedom include forward / backward, left / right, and up / down movement; rotational degrees of freedom include rotation around the X, Y, and Z axes. The 6DoF positioning information includes relative position information and rotation angle information. Based on the 6DoF positioning information of the HUD and controllers, more intelligent antenna feed point switching between the HUD and controllers can be achieved, thereby optimizing the antenna feed point combination between the HUD and controllers and enabling real-time alignment of the radiation patterns between them, ensuring BLE communication signal quality.

[0086] The system architecture of a wearable device 10 provided in this application embodiment is described below with reference to Figures 1 and 7. The system architecture of the wearable device 10 provided in this application embodiment includes a six-degrees-of-freedom (6DOF) positioning module 501, a main chip 502, a Bluetooth Low Energy System-on-a-Chip (BLE SOC) 503, a radio frequency module 504, and an antenna module 505.

[0087] The 6DoF positioning module 501 is used to acquire 6DoF positioning information, including the 6DoF positioning information of the head-mounted display 101, the 6DoF positioning information of the left controller 102, and the 6DoF positioning information of the right controller 103. The 6DoF positioning module 501 will be described in detail below, and will not be elaborated upon here.

[0088] The main chip 502 is used to calculate the relative position information and rotation angle information of the headset and controllers based on the acquired 6DoF positioning information; then, it determines whether to initiate antenna switching for the headset and controllers based on the relative position information and rotation angle information. The main chip 502 can be located on the headset. Alternatively, the main chip 502 can be located on a host device independent of the headset and controllers, which connects to the headset and controllers wirelessly or via a wired connection. Alternatively, there can be multiple main chips 502; for example, the main chip 502 may include a headset chip located on the headset and a controller chip located on the controllers.

[0089] The BLE SOC 503 is used to transmit / receive BLE signals between the headset and the controller, and sends a power-point switching signal to the RF module 504 according to the judgment logic of the main chip 502. It can be understood that both the headset and the controller are equipped with a BLE SOC 503.

[0090] The radio frequency module 504 is used to filter and amplify the BLE signal, and switch the radio frequency path to the corresponding feed point according to the feed point switching signal sent by the BLE SOC 503. It can be understood that both the headset and the controller are equipped with radio frequency modules 504.

[0091] Antenna module 505 is used to transmit and receive BLE electromagnetic wave signals in space and has the function of switching antenna patterns. It is understood that antenna module 505 includes a head-mounted display antenna and a controller antenna; in some embodiments, both the head-mounted display antenna and the controller antenna can be multi-feed single antennas.

[0092] It is understandable that the main chip 502, based on the relative positions of the headset and the controller, controls the BLE SOC 503 in the headset to adjust the feed point of the headset antenna, thereby switching the headset antenna pattern. Furthermore, the BLE SOC 503 in the controller can adjust the feed point of the controller antenna, thereby switching the controller antenna pattern, ensuring that the headset antenna pattern and the controller antenna pattern remain aligned at all times.

[0093] The following is a detailed explanation of the 6DoF positioning module 501.

[0094] In this embodiment, the 6DoF positioning module 501 may include a handle positioning module and a head-mounted display (HUD) positioning module. The following description, using the HUD's positioning of the handles as an example, details the structure of the handle positioning module and the HUD positioning module, as well as the positioning principle between them. It can be understood that both the left and right handles are equipped with this handle positioning module to achieve precise positioning of the left and right handles by the HUD.

[0095] Figure 8A is a structural block diagram of a positioning module 5011 provided in an embodiment of this application. In some embodiments, the handle positioning module includes the positioning module 5011. As shown in Figure 8A, the positioning module 5011 may include a signal generator 601, a digital-to-analog converter 602, a switching unit 603, a signal amplification unit 604, and a triaxial transmitting coil 605 connected in sequence. The signal generator 601 is a low-frequency signal generator. The low-frequency electromagnetic signal sent by the signal generator 601 passes through the digital-to-analog converter 602, the switching unit 603, and the signal amplification unit 604 in sequence, and is then transmitted by the triaxial transmitting coil 605 and received by the head-mounted display positioning module to achieve its positioning of the handle. Specifically, the digital-to-analog converter 602 includes three digital-to-analog converters, the switching unit 603 includes three switches, and the signal amplification unit 604 includes three signal amplifiers. The triaxial transmitting coil 605 includes a non-metallic cubic structure and three metal coils, namely metal coil X, metal coil Y, and metal coil Z, which are located on the X, Y, and Z faces of the non-metallic cubic structure, respectively. Each of the metal coils X, Y, and Z is connected to the signal generator 601 via a digital-to-analog converter, a switch, and a signal amplifier, as described above. The signal generator 601 sends low-frequency electromagnetic signals to each digital-to-analog converter in the digital-to-analog conversion unit 602. The signal frequency can be in the range of 30kHz to 150kHz, and the frequencies of the electromagnetic signals sent to each digital-to-analog converter can be the same or different.

[0096] Figure 8B is a structural block diagram of a positioning module 5012 provided in an embodiment of this application. In some embodiments, the head-mounted display positioning module includes the positioning module 5012. As shown in Figure 8B, in this embodiment, the positioning module 5012 is connected to the main chip 502. The positioning module 5012 includes an analog-to-digital conversion unit 701, a signal amplification unit 702, and a triaxial receiving coil 703 connected in sequence. The analog-to-digital conversion unit 701 includes three analog-to-digital converters, the signal amplification unit 702 includes three signal amplifiers, and the triaxial receiving coil 703 includes a non-metallic cubic structure and three metal coils, namely metal coil X, metal coil Y, and metal coil Z, which are located on the X, Y, and Z faces of the non-metallic cubic structure, respectively. Each of the metal coils X, Y, and Z is connected to the main chip 502 via the aforementioned analog-to-digital converter and signal amplifier. The triaxial receiving coil 703 can sense the electromagnetic signal emitted by the positioning module 5011 and generate an induced electromotive force. The three-axis receiving coil 703 transmits the induced electromotive force sequentially through the signal amplification unit 702 and the analog-to-digital conversion unit 701 to the main chip 502, which then calculates the relative position and rotation angle information of the head-mounted display and the controller.

[0097] It is understood that in some other embodiments, the handle positioning module may include the positioning module 5012 shown in FIG8B, and the head-mounted display positioning module may include the positioning module 5011 shown in FIG8A. In this way, the low-frequency signal sent by the head-mounted display positioning module can be collected by the handle positioning module to realize the positioning of the handle on the head-mounted display.

[0098] It is understood that in some other embodiments, the handle positioning module includes positioning module 5011 and positioning module 5012, and the head-mounted display positioning module includes positioning module 5011 and positioning module 5012, so that the head-mounted display and the handle can be mutually positioned.

[0099] In some embodiments, the 6DoF positioning module 501 may include a signal generator, a digital-to-analog converter, a switching unit, a signal amplification unit, a three-axis transmitting coil, an analog-to-digital converter, a signal amplification unit, and a function switch. The function switch controls the 6DoF positioning module 501 to perform the functions of the positioning module 5011 or positioning module 5012 described above. Both the head-mounted display and the controller may be equipped with the 6DoF positioning module 501. The function switch enables positioning of the head-mounted display relative to the controller, positioning of the controller relative to the head-mounted display, or mutual positioning between the head-mounted display and the controller.

[0100] Referring again to FIG8A, in some embodiments, taking the electromagnetic signal emitted by the signal generator 601 to any digital-to-analog converter as an example, the waveform of the electromagnetic signal can be seen in FIG9(1). As shown in FIG9(1), the electromagnetic signal emitted by the signal generator 601 is a continuous signal and the signal strength (amplitude) remains unchanged, which may result in relatively high power consumption of the positioning module 5011.

[0101] Based on this, in some other embodiments, the electromagnetic signal emitted by the signal generator 601 is adjusted to a periodic signal, as shown in (2) of Figure 9. During the periodic time T, an electromagnetic signal with a constant amplitude is emitted during the first T / 2 time period, and no electromagnetic signal is emitted during the second T / 2 time period. In this way, the emission power consumption of the positioning module 5011 can be reduced.

[0102] Furthermore, considering that the electromagnetic signal detected by the positioning module 5012 is inversely proportional to the cube of the distance between the positioning modules 5011 and 5012, when the distance between the handle and the head-mounted display is relatively close, the induced electromotive force generated by the positioning module 5012 will increase sharply, even exceeding the maximum value of the induced electromotive force of the positioning module 5012, which may lead to data overflow and failure of the positioning function.

[0103] Based on this, in some embodiments, the amplitude of the electromagnetic signal emitted by the positioning module 5011 is adjusted according to the distance between the handle and the head-mounted display. As shown in (3) of Figure 9, when the distance between the handle and the head-mounted display is relatively close, the amplitude of the emitted electromagnetic signal is reduced (i.e., the signal shown in part T1); when the distance between the handle and the head-mounted display is relatively far, the amplitude of the emitted electromagnetic signal is increased (i.e., the signal shown in part T2).

[0104] To enable the positioning module 5012 to promptly determine which electromagnetic signal emission amplitude of the positioning module 5011 corresponds to the sensed electromotive force, this embodiment of the application further encodes different signal amplitudes. For example, a short prefix signal of the same frequency and amplitude is sent before each cycle of the electromagnetic signal, as shown in Figure 9(4). As shown in Figure 9(4), the signal marked by the black arrow is the aforementioned prefix signal. In the signal shown in part T1, the time interval between the prefix signal and the electromagnetic signal is set to be relatively large; in the signal shown in part T2, the time interval between the prefix signal and the electromagnetic signal is set to be relatively small. For example, when the amplitude is less than 500mV, the time interval can be set to 2ms; when the amplitude is greater than 500mV, the time interval can be set to 1ms. For another example, there is a one-to-one correspondence between the amplitude and the time interval, and the size of the time interval is determined according to the specific amplitude. In this way, the positioning module 5012 can determine the emission amplitude of the subsequent electromagnetic signal based on the detected time interval between the prefix signal and the subsequent electromagnetic signal. In other words, when a large time interval is detected between the prefix signal and the subsequent electromagnetic signal, the amplitude of the subsequent electromagnetic signal is determined to be relatively small; conversely, when a small time interval is detected between the prefix signal and the subsequent electromagnetic signal, the amplitude of the subsequent electromagnetic signal is determined to be relatively large. Thus, by adjusting the amplitude of the emitted electromagnetic signal based on the distance between the headset and the controller, and encoding different signal amplitudes, the power consumption of the controller can be reduced without affecting positioning accuracy, avoiding positioning function failure caused by data overflow.

[0105] Referring to Figure 10, which is a schematic diagram of the structure of the head-mounted display 101 provided in an embodiment of this application, the BLE SOC 503 and the radio frequency module 504 constitute a BLE radio frequency circuit for BLE signal transmission, reception, and selection of the antenna feed point.

[0106] As mentioned earlier, both the headset and the controller are equipped with a BLE SOC 503 and an RF module 504. Therefore, both the headset and the controller have the RF circuit shown in Figure 10. The RF circuit in the headset is used to control the switching of the headset antenna feed point, and the RF circuit in the controller is used to control the switching of the controller antenna feed point. It can be understood that the RF principles of the headset and the controller are the same. The following text mainly describes the specific structure and working principle of the RF circuit in the headset 101 based on Figure 10.

[0107] As shown in Figure 10, the RF module 504 includes a filter 801, a double-pole double-throw (DPDT) switch 802, and a matching load 803. The filter 801 filters the BLE signal transmitted by the BLE SOC 503 or the BLE signal received via the antenna. The DPDT switch 802 includes ports RFIN1, RFIN2, RFOUT1, and RFOUT2. Ports RFIN1 and RFIN2 are each connected to a movable conductive blade. When the conductive blade at port RFIN1 is connected to port RFOUT1, one end of the DPDT switch 802 is connected to the filter 801, and the other end is connected to the feed point A1 of the BLE antenna 1011. In this case, the BLE antenna 1011 is fed through feed point A1, enabling signal transmission and reception. When the conductive switch at port RFIN1 is connected to port RFOUT2, one end of DPDT switch 802 is connected to filter 801, and the other end is connected to feed point A2 of BLE antenna 1011. At this time, BLE antenna 1011 is fed through feed point A2 to realize signal transmission and reception. BLE SOC 503 outputs a feed point switching signal to DPDT switch 802 through its output port GPIO. After receiving the feed point switching signal, DPDT switch 802 moves the conductive switch to the corresponding position, completing the switching between feed point A1 and feed point A2.

[0108] In some embodiments, the main chip 502 can be connected to the DPDT switch 802 in the radio frequency module 504, and output a feed point switching signal to the DPDT switch 802 through the output port GPIO to realize the switching of the antenna feed point.

[0109] Matching load 803 is located at port RFOUT2 of DPDT switch 802. When the conductive switch at port RFIN1 is connected to port RFOUT2, the BLE antenna 1011 is fed through feed point A2. At this time, the conductive switch at port RFIN2 is connected to port RFOUT1, and feed point A1 is grounded through matching load 803. When the conductive switch at port RFIN1 is connected to port RFOUT1, the BLE antenna 1011 is fed through feed point A1, and the conductive switch at port RFIN2 is connected to port RFOUT2. Feed point A2 is grounded through matching load 803. Matching load 803 can reduce echo and absorb energy, preventing open circuits from affecting the performance of the RF circuit. Specifically, matching load 803 may include one or more resistors connected in series.

[0110] In some embodiments, the switch in the RF path can also be a single-pole double-throw (SPDT) switch. The SPDT switch includes a movable conductive blade, one end of which can be connected to a filter, and the other end has two ports: one port is connected to the first feed point of the antenna module 505, and the other port is connected to the second feed point of the antenna module 505. The RF path can control the movement of the conductive blade according to the feed point switching signal to complete the feed point switching. It is understood that a matching load 803 is not required in this RF path.

[0111] In some embodiments, the BLE antenna 1011 on the head-up display 101, the BLE antenna 1021 on the left handle 102, and the BLE antenna 1031 on the right handle 103 are all dual-fed single antennas. The antennas 1011 and 1031 will be described in detail below with reference to Figures 11A-11D. Figure 11A is a front view of the head-up display 101, and Figure 11B is a schematic diagram of the antenna radiation pattern of the head-up display. Figure 11C shows a side view and a top view of the right handle 1031, and Figure 11D is a schematic diagram of the antenna radiation pattern of the right handle.

[0112] As shown in Figure 11A, the BLE antenna 1011 is located in the middle below the head-mounted display PCB motherboard 001. The BLE antenna 1011 has two feed points, A1 and A2. Feed point A1 is located in the middle of the BLE antenna 1011, and feed point A2 is a certain distance from feed point A1. As shown in Figure 11B, when the antenna 1011 is fed through feed point A1, it generates radiation pattern A11; when the antenna 1011 is fed through feed point A2, it generates radiation pattern A21. At the same time, the BLE antenna 1011 can be fed either feed point A1 or feed point A2. Since feed points A1 and A2 can excite different current modes, the radiation patterns A11 of feed point A1 and A21 of feed point A2 can have a complementary effect.

[0113] It should be understood that the distance between feed point A2 and feed point A1 should ensure a high degree of isolation between them, thereby achieving complementarity between the radiation patterns A11 of feed point A1 and A21 of feed point A2. The distance between feed point A2 and feed point A1 is related to the length of the antenna in practical applications, and this application does not limit the specific value of this distance.

[0114] It is understandable that the BLE antenna 1011 can also be located in other positions on the headset, such as within the PCB motherboard 001. This requires sufficient space between the PCB motherboard 001 and the headset housing to accommodate the BLE antenna 1011. The PCB motherboard 001 can be the motherboard for the BLE SOC 503. The optimal choice is to position the BLE antenna 1011 in the middle below the headset's PCB motherboard 001, as this minimizes the distance to the BLE antenna on the controller.

[0115] As shown in Figure 11C, the left side of Figure 11C is a side view of the right-hand handle 1031. The BLE antenna 1031 is located above the PCB motherboard of the right-hand handle and has two feed points, namely feed point B1 and feed point B2. Feed point B1 is located in the middle of the BLE antenna 1031, and there is a certain distance between feed point B2 and feed point B1. The right side of Figure 11C is a top view of the right-hand handle 1031, with the BLE antenna 1031 located on the left side of the PCB motherboard of the right-hand handle. As shown in Figure 11D, when the antenna 1031 is fed through feed point B1, it generates radiation pattern B11; when the antenna is fed through feed point B2, it generates radiation pattern B21. At the same time, the BLE antenna 1031 can choose to be fed through feed point B1 or feed point B2. Since feed points B1 and B2 can excite different current modes, the radiation patterns B11 of feed point B1 and B21 of feed point B2 can have a complementary effect.

[0116] It should be understood that the distance between feed point B2 and feed point B1 should ensure a high degree of isolation between them, thereby achieving complementarity between the radiation patterns B11 of feed point B1 and B21 of feed point B2. The distance between feed point B2 and feed point B1 is related to the length of the antenna in practical applications, and this application does not limit the specific value of this distance.

[0117] It is understandable that the BLE antenna 1031 can also be located in other positions on the handle. When the BLE antenna 1031 is located on the left side of the PCB motherboard as shown in the top view on the right side of Figure 11C, the distance between it and the head-mounted display's BLE antenna 1011 is the shortest, which is the optimal choice.

[0118] It is understandable that the BLE antenna of the left-hand controller is symmetrical to the BLE antenna of the right-hand controller. It can be located on the right side of the PCB motherboard in the top view of the left-hand controller. When the left-hand controller BLE antenna 1021 is located in this position, the distance between it and the head-mounted display BLE antenna 1011 is the shortest, which is the optimal choice.

[0119] In the above embodiments, both the head-mounted display (HUD) and the controller employ dual-fed single-antenna BLE antennas. The controller's BLE antenna has a resonant frequency of 2.4GHz-2.48GHz, uses a 1 / 2 wavelength mode, and has two feed points, positioned at the edge of the controller. The HUD's BLE antenna also has a resonant frequency of 2.4GHz-2.48GHz, uses a 1 / 2 wavelength mode, and has two feed points, located in the center of the HUD. Both the controller and HUD antennas can generate different current modes by selecting different feed points, resulting in different radiation patterns and a more comprehensive antenna pattern. Furthermore, this eliminates the need to combine antennas with different radiation directions to achieve antenna pattern differences, facilitating the implementation of thinner and lighter products and reducing costs.

[0120] It is understood that in other embodiments, the BLE antennas of the headset and controllers may also be single antennas with two or more feed points. Specifically, the length of the antenna can be adjusted according to the number of feed points to be implemented, so that the antenna can generate more different radiation patterns with more feed points, thereby covering a wider radiation range and adapting to more complex wearable scenarios.

[0121] The preceding text mainly introduced the hardware structure of the wearable device 10. The following section, in conjunction with Figure 12, describes a software solution for the wearable device 10. This software solution includes an antenna control method. Taking the positioning of the left hand handle of the head-mounted display as an example, this antenna control method can be implemented by the main chip 502. As shown in Figure 12, the antenna control method provided in this embodiment includes the following steps:

[0122] S901: Power on.

[0123] In this embodiment, the main chip 502 detects that the wearable device 10 is powered on and then activates the positioning function of the head-mounted display and the left-hand controller.

[0124] S902: Headset positioning handle position.

[0125] In this embodiment, the head-mounted display can acquire the 6DoF positioning information of the left hand controller, and based on the 6DoF positioning information of the left hand controller, calculate the relative position information between the head-mounted display and the left hand controller and the rotation angle information of the left hand controller.

[0126] It is understood that in some embodiments, the handle can also locate the head-up display position. By obtaining the 6DoF positioning information of the head-up display, and calculating the relative position information between the head-up display and the handle and the rotation angle information of the head-up display based on the 6DoF positioning information of the head-up display, the positioning of the head-up display by the handle is completed.

[0127] S903: Determines whether power supply point switching is needed based on the handle position.

[0128] In this embodiment, the head-mounted display can determine whether a power supply point switch is needed based on the position of the left hand controller. When the position of the left hand controller is determined to be within the range of X<0 and Y<0, i.e., the left hand controller is located to the left rear of the human body, step S904 is executed; when the position of the left hand controller is determined to be within the range of X<0 and Y>0, i.e., the left hand controller is located to the left front of the human body, step S905 is executed; when the position of the left hand controller is determined to be within the range of X>0 and Y>0, i.e., the left hand controller is located to the right front of the human body, step S906 is executed; when the position of the left hand controller is determined to be within the range of X>0 and Y<0, i.e., the left hand controller is located to the right rear of the human body, step S907 is executed.

[0129] In some embodiments, the head-mounted display (HUD) can determine the movement trend of the controllers based on the 6DoF positioning information of the controllers, and determine whether a power supply point switching is required based on the movement trend of the controllers. For example, when the HUD determines, based on the 6DoF positioning information of the left controller, that the left controller has a tendency to move from the range of X<0 and Y>0 to the range of X<0 and Y<0, i.e., from the left front of the body to the left rear of the body, step S904 is executed; when it is determined that the left controller has a tendency to move from the range of X<0 and Y<0 to the range of X<0 and Y>0, i.e., from the left rear of the body to the left front of the body, step S905 is executed; when it is determined that the left controller has a tendency to move from the range of X<0 and Y>0 to the range of X>0 and Y>0, i.e., from the left front of the body to the right front of the body, step S906 is executed.

[0130] S904: Switch the head-mounted display antenna to feed point A1, and switch the handle antenna to feed point B2.

[0131] In this embodiment, when the head-mounted display determines that the left handle is located to the left rear of the human body, the head-mounted display antenna is switched to feed point A1 and the left handle antenna is switched to feed point B2 to ensure that the head-mounted display BLE antenna pattern is aligned with the left handle BLE antenna pattern.

[0132] It is understood that if the headset's BLE antenna is being fed through feed point A1 when this step is performed, there is no need to switch the feed point of the headset's BLE antenna; simply switch the feed point of the left-hand handle's BLE antenna to feed point B2. If the left-hand handle's BLE antenna is being fed through feed point B2, there is no need to switch the feed point of the left-hand handle's BLE antenna; simply switch the feed point of the headset's BLE antenna to feed point A1. If the headset's BLE antenna is being fed through feed point A1 and the left-hand handle's BLE antenna is being fed through feed point B2, there is no need to switch the feed points, and step S908 is executed.

[0133] S905: Switch the head-mounted display antenna to feed point A1, and switch the handle antenna to feed point B1.

[0134] In this embodiment of the application, when the head-mounted display determines that the left hand controller is located in front of the left side of the human body, the head-mounted display antenna is switched to feed point A1 and the left hand controller antenna is switched to feed point B1 to ensure that the head-mounted display BLE antenna pattern is aligned with the left hand controller BLE antenna pattern.

[0135] It is understood that if the headset's BLE antenna is being fed through feed point A1 when this step is performed, there is no need to switch the feed point of the headset's BLE antenna; simply switch the feed point of the left-hand handle's BLE antenna to feed point B1. If the left-hand handle's BLE antenna is being fed through feed point B1, there is no need to switch the feed point of the left-hand handle's BLE antenna; simply switch the feed point of the headset's BLE antenna to feed point A1. If both the headset's BLE antenna and the left-hand handle's BLE antenna are being fed through feed point B1, there is no need to switch the feed points, and step S908 is executed.

[0136] S906: Switch the head-mounted display antenna to feed point A2, and switch the handle antenna to feed point B2.

[0137] In this embodiment, when the head-mounted display determines that the left hand controller is located in front of the right side of the human body, the head-mounted display antenna is switched to feed point A2 and the left hand controller antenna is switched to feed point B2 to ensure that the head-mounted display BLE antenna pattern is aligned with the left hand controller BLE antenna pattern.

[0138] It is understood that if the headset's BLE antenna is being fed through feed point A2 when this step is performed, there is no need to switch the feed point of the headset's BLE antenna; simply switch the feed point of the left-hand controller's BLE antenna to feed point B2. If the left-hand controller's BLE antenna is being fed through feed point B2, there is no need to switch the feed point of the left-hand controller's BLE antenna; simply switch the feed point of the headset's BLE antenna to feed point A2. If both the headset's BLE antenna and the left-hand controller's BLE antenna are being fed through feed point B2, there is no need to switch the feed points, and step S908 is executed.

[0139] S907: Error.

[0140] In this embodiment of the application, when the head-mounted display determines that the left handle is located behind the right side of the human body, it indicates that the head-mounted display has made a mistake in positioning the left handle and needs to re-acquire the positioning information of the left handle.

[0141] It is understandable that during actual use of wearable devices, the left handle will generally not move to the right rear of the human body, as this is not ergonomic. Therefore, when the head-mounted display determines that the left handle is located to the right rear of the human body, it will reposition the handle and refresh the position information of the left handle.

[0142] S908: Headset positioning handle position (refresh).

[0143] In this embodiment of the application, after the head-mounted display and the controller's BLE antenna feed point are switched, the head-mounted display will reposition the left controller and refresh the left controller's position information.

[0144] The application scenarios of the wearable device 10 provided in the embodiments of this application are described below with reference to Figures 4A-4C and 13A-15B.

[0145] Referring to Figure 4A, in a scenario where the arm swings to the opposite side (i.e., the handle swings from one side of the headset to the other), taking the left handle swinging to the right side of the headset as an example, as shown in Figure 13A, when the left handle is on the left side of the headset, the BLE antenna 1021 on the left handle is fed through feed point B1, and the headset's BLE antenna 1011 is fed through feed point A1. At this time, the radiation pattern B11 of feed point B1 is aligned with the radiation pattern A11 of feed point A1. When the left handle moves to the right side of the headset, the headset detects the change in the left handle's position and switches the feed point of the headset's BLE antenna to feed point A2, and switches the feed point of the BLE antenna on the left handle to feed point B2. At this time, the radiation pattern A21 of feed point A2 is aligned with the radiation pattern B21 of feed point B2. This provides a better headset handle connection experience and ensures signal quality.

[0146] Referring to Figure 13B, which shows a communication gain diagram in a scenario where the arm swings to the opposite side. As shown in Figure 13B, when the left-hand handle is on the left side of the head-up display, it should be fed through feed point B1 to ensure that the radiation pattern B11 of the handle's BLE antenna feed point B1 is aligned with the radiation pattern A11 of the head-up display's BLE antenna feed point A1.

[0147] When the left-hand controller is moved to the right side of the headset, a feed point switch is required. The controller's BLE antenna is switched from feed point B1 to feed point B2, and the headset's BLE antenna is switched from feed point A1 to feed point A2, ensuring that the headset's BLE antenna pattern A21 aligns with the controller's BLE antenna pattern B21. Switching only the controller's BLE antenna from feed point B1 to feed point B2 yields a 6.41 dB communication link enhancement; switching only the headset's BLE antenna from feed point A1 to feed point A2 yields a 2.70 dB communication link enhancement; and switching the feed points of both the headset and controller's BLE antennas yields a 9.11 dB communication link enhancement.

[0148] It is understandable that the higher the communication link enhancement value, the higher the communication quality.

[0149] Referring to Figure 4B, in a scenario where the arm is swung behind the head (i.e., the handle is behind the head-up display), taking the right handle swung to the back of the head-up display as an example, as shown in Figure 14A, when the right handle is in front of the head-up display, the BLE antenna 1031 on the right handle is fed through feed point B1, and the head-up display's BLE antenna 1011 is fed through feed point A1. At this time, the radiation pattern B11 of feed point B1 is aligned with the radiation pattern A11 of feed point A1. When the right handle moves to the back of the head-up display, the head-up display detects the change in the position of the right handle and switches the feed point of the right handle's BLE antenna to feed point B2. At this time, the radiation pattern B21 of feed point B2 is aligned with the radiation pattern A11 of feed point A1. This provides a better head-up display handle connection experience and ensures signal quality.

[0150] Referring to Figure 14B, which shows a communication gain diagram in a scenario where the arm is swung behind the head. As shown in Figure 14B, when the right-hand handle is in front of the head-mounted display, it should be fed through feed point B1 to ensure that the radiation pattern B11 of the handle's BLE antenna feed point B1 is aligned with the radiation pattern A11 of the head-mounted display's BLE antenna feed point A1.

[0151] When the right-hand controller is moved to the rear of the headset, a feed point switch is required. The controller's BLE antenna needs to be switched from feed point B1 to feed point B2 to ensure that the headset's BLE antenna pattern A11 aligns with the controller's BLE antenna pattern B21. Switching the controller's BLE antenna from feed point B1 to feed point B2 provides a 6.07 dB increase in communication link strength.

[0152] Referring to Figure 4C, in a scenario where the user's hand rotates (i.e., the handle rotates), taking the left-hand handle rotation as an example, as shown in Figure 15A, before the left-hand handle rotates, the left-hand handle BLE antenna 1021 is fed through feed point B1, and the headset BLE antenna 1011 is fed through feed point A1. At this time, the radiation pattern B11 of feed point B1 is aligned with the radiation pattern A11 of feed point A1. When the left-hand handle rotates by θ degrees, the headset detects the rotation angle information of the left-hand handle and switches the feed point of the left-hand handle BLE antenna to feed point B2. At this time, the radiation pattern B21 of feed point B2 is aligned with the radiation pattern A11 of feed point A1. In this way, a better headset handle connection experience can be obtained, ensuring signal quality.

[0153] Referring to Figure 15B, which shows a schematic diagram of communication gain in a scenario where the user's hand is rotating (i.e., the handle is rotating), as shown in Figure 15B, the left-hand handle should be fed through feed point B1 before rotation to ensure that the radiation pattern B11 of the handle's BLE antenna feed point B1 is aligned with the radiation pattern A11 of the head-mounted display's BLE antenna feed point A1.

[0154] After rotating the left-hand handle by θ degrees, a feed point switch is required. The handle's BLE antenna needs to be switched from feed point B1 to feed point B2 to ensure that the headset's BLE antenna pattern A11 aligns with the handle's BLE antenna pattern B21. Switching the handle's BLE antenna from feed point B1 to feed point B2 provides a 9.02 dB increase in communication link strength.

[0155] In this embodiment, the relative position and rotation angle information are obtained by detecting the relative position between the headset and the controller. This takes into account the three-dimensional spatial changes and rotation angle changes of the controller and headset positions, providing more comprehensive position information. Based on this position information, the BLE antenna feed point is switched to ensure that the radiation pattern of the headset's BLE antenna is aligned with that of the controller's BLE antenna. This allows for optimal selection of the radiation patterns of the headset and controller in any scenario, resulting in higher communication link enhancement benefits and ensuring communication quality.

[0156] In some embodiments, both the headset and the controller employ a multi-antenna architecture. When the headset detects a change in the controller's position, it performs antenna rotation, selecting an antenna based on signal quality metrics such as Received Signal Strength Indication (RSSI), Packet Error Rate (PER), Reference Signal Power (RSRP), and Signal-to-Noise Ratio (SNR). This antenna rotation process results in a lengthy antenna switching time, impacting communication between the headset and the controller. The wearable device provided in this embodiment eliminates the need for antenna rotation, and the switching time for the antenna feed point is significantly shorter.

[0157] It is understood that, as used herein, the term “module” may refer to or include, or be part of, an application-specific integrated circuit (ASIC), electronic circuitry, a processor (shared, dedicated, or grouped) and / or memory that executes one or more software or firmware programs, combinational logic circuitry, and / or other suitable hardware components that provide the described functionality.

[0158] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions carried or stored thereon on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, the instructions may be distributed via a network or through other computer-readable media. Machine-readable media include any type of machine-readable medium suitable for storing or transmitting electronic instructions or information in a machine-readable (e.g., computer-readable) form.

[0159] In the accompanying drawings, some structural or methodological features may be shown in a specific arrangement and / or order. However, it should be understood that such a specific arrangement and / or order may not be necessary. Rather, in some embodiments, these features may be arranged in a manner and / or order different from that shown in the illustrative drawings. Furthermore, the inclusion of structural or methodological features in a particular figure does not imply that such features are required in all embodiments, and in some embodiments, these features may be omitted or may be combined with other features.

[0160] It should be noted that in the examples and specifications of this application, relational terms such as "first" and "second" are used only to distinguish one signal or parameter from another, and do not necessarily require or imply any such actual relationship or order between these signals or parameters. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0161] Although this application has been illustrated and described with reference to certain preferred embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made thereto without departing from the scope of this application.

Claims

1. A wearable device, characterized in that, The device includes a handle and a head-mounted display. The head-mounted display includes a first antenna with a first feed point and a second feed point. The handle includes a second antenna. The second antenna includes a third feed point and a fourth feed point. When the first antenna is fed through the first target feed point among the first feed point and the second feed point, it generates a first target radiation pattern; When the second antenna is fed through the second target feed point among the third feed point and the fourth feed point, it generates a second target radiation pattern; The antenna radiation range indicated by the first target radiation pattern at least partially overlaps with the antenna radiation range indicated by the second target radiation pattern.

2. The wearable device according to claim 1, characterized in that, The wearable device uses the six degrees of freedom positioning information of the head-mounted display and the handle to determine the first target power supply point and the second target power supply point, wherein the six degrees of freedom positioning information includes relative position information and rotation angle information.

3. The wearable device according to claim 2, characterized in that, The head-mounted display and the handle are each equipped with a positioning module, which determines the six degrees of freedom positioning information of the head-mounted display and the handle based on electromagnetic signals.

4. The wearable device according to claim 3, characterized in that, The handle includes a first positioning module, which comprises a signal generator, a digital-to-analog converter, a switching unit, a first signal amplification unit, and a triaxial transmitting coil connected in sequence; wherein... The signal generator is used to send the electromagnetic signal, which passes through the digital-to-analog converter, the switching unit, and the first signal amplification unit in sequence, and is then emitted by the triaxial transmitting coil.

5. The wearable device according to claim 4, characterized in that, The head-mounted display includes a second positioning module, which comprises an analog-to-digital conversion unit, a second signal amplification unit, and a three-axis receiving coil connected in sequence; wherein... The triaxial receiving coil is used to detect the induced electromotive force generated by the electromagnetic signal, and the induced electromotive force is processed by the second signal amplification unit and the analog-to-digital conversion unit in sequence to determine the six-degree-of-freedom positioning information of the head-mounted display and the handle.

6. The wearable device according to claim 3, characterized in that, The head-mounted display includes a first positioning module, which comprises a signal generator, a digital-to-analog converter, a switching unit, a first signal amplification unit, and a triaxial transmitting coil connected in sequence; wherein... The signal generator is used to send the electromagnetic signal, which passes through the digital-to-analog converter, the switching unit, and the first signal amplification unit in sequence, and is then emitted by the triaxial transmitting coil.

7. The wearable device according to claim 6, characterized in that, The handle includes a second positioning module, which comprises an analog-to-digital converter, a second signal amplification unit, and a triaxial receiving coil connected in sequence; wherein... The triaxial receiving coil is used to detect the electromagnetic signal to generate an induced electromotive force, and the induced electromotive force is processed sequentially by the second signal amplification unit and the analog-to-digital conversion unit to determine the six-degree-of-freedom positioning information of the head-mounted display and the handle.

8. The wearable device according to any one of claims 3-7, characterized in that, The electromagnetic signal is a periodic signal, and at least two of the periodic signals in the electromagnetic signal have different amplitudes.

9. The wearable device according to claim 8, characterized in that, Each periodic signal in the electromagnetic signal has a prefix signal, and the prefix signal of each periodic signal has the same amplitude and frequency as the periodic signal.

10. The wearable device according to claim 9, characterized in that, The amplitude of the first periodic signal in the electromagnetic signal is greater than the amplitude of the second periodic signal, and the first periodic signal has a first prefix signal, while the second periodic signal has a second prefix signal. The time interval between the first prefix signal and the first periodic signal is less than the time interval between the second prefix signal and the second periodic signal.

11. The wearable device according to claim 1, characterized in that, When the first antenna is fed through the first feed point, it generates a first radiation pattern; when the first antenna is fed through the second feed point, it generates a second radiation pattern. The antenna radiation range indicated by the first radiation pattern does not overlap with the antenna radiation range indicated by the second radiation pattern at least partially.

12. The wearable device according to claim 1 or 11, characterized in that, When the second antenna is fed through the third feed point, it generates a third radiation pattern; when the second antenna is fed through the fourth feed point, it generates a fourth radiation pattern. The antenna radiation range indicated by the third directional pattern does not overlap with the antenna radiation range indicated by the fourth directional pattern at least partially.

13. An antenna control method, characterized in that, An application to a wearable device, the wearable device including a handle and a head-mounted display, the head-mounted display including a first antenna including a first feed point and a second feed point, the handle including a second antenna, the second antenna including a third feed point and a fourth feed point, the method including: A first target feed point is determined from the first feed point and the second feed point, and a second target feed point is determined from the third feed point and the fourth feed point; Control the first antenna to be fed through the first target feed point, and control the second antenna to be fed through the second target feed point; Wherein, when the first antenna is fed through the first target feed point, it generates a first target radiation pattern; when the second antenna is fed through the second target feed point, it generates a second target radiation pattern; and the antenna radiation range indicated by the first target radiation pattern and the antenna radiation range indicated by the second target radiation pattern at least partially overlap.

14. The antenna control method according to claim 13, characterized in that, Determining a first target feed point from the first feed point and the second feed point, and determining a second target feed point from the third feed point and the fourth feed point, includes: Based on the six-degree-of-freedom positioning information of the head-mounted display and the handle, the first target power supply point and the second target power supply point are determined. The six-degree-of-freedom positioning information includes relative position information and rotation angle information.

15. The antenna control method according to claim 14, characterized in that, Also includes: Based on the electromagnetic signals between the head-mounted display and the handle, the six-degree-of-freedom positioning information of the head-mounted display and the handle is determined.

16. The antenna control method according to claim 15, characterized in that, The electromagnetic signal is a periodic signal, and at least two of the periodic signals in the electromagnetic signal have different amplitudes.

17. The antenna control method according to claim 16, characterized in that, Each periodic signal in the electromagnetic signal has a prefix signal, and the prefix signal of each periodic signal has the same amplitude and frequency as the periodic signal.

18. The antenna control method according to claim 17, characterized in that, The amplitude of the first periodic signal in the electromagnetic signal is greater than the amplitude of the second periodic signal, and the first periodic signal has a first prefix signal, while the second periodic signal has a second prefix signal. The time interval between the first prefix signal and the first periodic signal is less than the time interval between the second prefix signal and the second periodic signal.

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