Head-mounted display device

Abstract

The embodiment of the utility model discloses a head-mounted display device which comprises a cross beam, a first support, a second support, a first optical assembly, a second optical assembly and a driving mechanism, the first support and the second support are movably arranged on the cross beam, the first optical assembly is connected to the first support, and the second optical assembly is connected to the second support. The first optical assembly is connected to the first support, the second optical assembly is connected to the second support, the driving mechanism is arranged on the cross beam and comprises a transmission shaft and a motor, the transmission shaft is connected to the first support and the second support, and a rotating shaft of the motor is coaxially connected with the transmission shaft. The first support and the second support are driven to get close to each other or get away from each other in the opposite directions in the length direction of the transmission shaft.

Description

Technical Field

[0001] This disclosure relates to the field of electronic device technology, and more particularly to a head-mounted display device. Background Technology

[0002] Currently, VR (Virtual Reality), AR (Augmented Reality), and MR (Mixed Reality) are attracting more and more users. Users need to wear head-mounted displays to experience these effects. Improving user comfort and visual effects, and meeting the needs of different groups, are important directions for the development of head-mounted display devices. Utility Model Content

[0003] This disclosure provides a head-mounted display device to improve user comfort and visual effects, and to meet the wearing needs of different groups of people.

[0004] To achieve the above objectives, this disclosure provides the following technical solution:

[0005] A head-mounted display device includes: a crossbeam, a first bracket, a second bracket, a first optical component, a second optical component, and a driving mechanism. The first bracket and the second bracket are movably disposed on the crossbeam. The first optical component is connected to the first bracket, and the second optical component is connected to the second bracket. The driving mechanism is disposed on the crossbeam and includes a drive shaft and a motor. The drive shaft is connected to the first bracket and the second bracket. The rotating shaft of the motor is coaxially connected to the drive shaft to drive the first bracket and the second bracket to move closer to each other or further away from each other along the length direction of the drive shaft.

[0006] By adopting the above technical solution, this application has the following beneficial effects:

[0007] The driving mechanism of the head-mounted display device provided in this embodiment provides the moving power of the first bracket and the second bracket, so that the first bracket and the second bracket can move closer to each other or move further apart in opposite directions, thereby adjusting the distance between the first optical component and the second optical component, that is, adjusting the interpupillary distance of the head-mounted display device, so as to improve the user's wearing comfort and visual effect and meet the wearing needs of different groups of people.

[0008] The technical solutions of this disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0009] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0010] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description, wherein:

[0011] Figure 1 An exploded view of the head-mounted display device provided in an embodiment of this disclosure is shown;

[0012] Figure 2 Another exploded view of the head-mounted display device provided in the embodiments of this disclosure is shown;

[0013] Figure 3 This diagram shows a stereoscopic view of the head-mounted display device provided in an embodiment of the present disclosure;

[0014] Figure 4 Show Figure 3 Cross-sectional view along line AA (cross-sectional views of some unrelated components are not shown);

[0015] Figure 5 Show Figure 3 Cross-sectional view along the BB direction (cross-sectional views of some unrelated components are not shown);

[0016] Figure 6 This diagram illustrates the structure of a head-mounted display device with a ranging component and a ranging mating component provided in an embodiment of this disclosure.

[0017] Figure 7 A schematic diagram of the optical components of a head-mounted display device provided in an embodiment of this disclosure is shown.

[0018] In the diagram, 1 is the crossbeam; 11 is the slide rail assembly; 111 is the slide rail; and 12 is the threaded groove.

[0019] 2a. First bracket; 2b. Second bracket; 21. Transmission assembly; 211. Guide hole; 212. Threaded hole; 22. Sliding assembly; 221. First clearance groove; 222. Second clearance groove; 223. Slider; 3a. First optical assembly; 3b. Second optical assembly; 31. First circuit board; 32. Image source assembly; 33. Beam splitter; 34. Reflector; a. Eye;

[0020] 4. Drive mechanism; 41. Mounting housing; 42. Drive shaft; 421. First threaded section; 422. Second threaded section; 43. Motor; 44. Reducer; 45. Guide post;

[0021] 5. Elastic limiting component; 51. Bolt; 52. Elastic element; 53. Foam; 6. Second circuit board; 7. Distance measuring component; 8. Distance measuring mating part; 9. Connecting part.

[0022] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this disclosure, but are not intended to limit the scope of this disclosure.

[0024] In the description of this disclosure, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0025] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0026] Exemplary Overview

[0027] Head-mounted displays (HMDs) are also known as head-mounted displays or head-mounted headsets. They are used to achieve augmented reality (AR), virtual reality (VR), and mixed reality (MR) effects. HMDs can take the form of glasses, helmets, etc. In the design of HMDs, interpupillary distance (IPD) adjustment is one of the key technologies for improving user experience. IPD, the distance between a user's pupils, is crucial to the visual effect of a HMD. The main purpose of adjusting IPD is to ensure that the optical center of the HMD is aligned with the center of the user's pupils, thereby improving wearing comfort and visual effects. Improper IPD adjustment can lead to problems such as blurred images and ghosting, affecting the user experience.

[0028] Exemplary Structure

[0029] Some exemplary embodiments of this disclosure provide a head-mounted display device. The head-mounted display device may be a display device such as glasses or a helmet.

[0030] Some exemplary embodiments of this disclosure provide a head-mounted display device. For example... Figures 1 to 3As shown, the head-mounted display device provided in the embodiments of this disclosure may include: a crossbeam 1; a bracket, the bracket including a first bracket 2a and a second bracket 2b; and optical components, the optical components including a first optical component 3a and a second optical component 3b. Both the first bracket 2a and the second bracket 2b are movably disposed on the crossbeam 1, the first optical component 3a is disposed on the first bracket 2a, and the second optical component 3b is disposed on the second bracket 2b.

[0031] In some alternative embodiments, the head-mounted display device further includes a drive mechanism 4. The drive mechanism 4 may be disposed on the crossbeam 1 and is used to provide moving power to the first support 2a and the second support 2b, so that the first support 2a and the second support 2b can move closer to each other or move further away from each other, thereby adjusting the distance between the first optical component 3a and the second optical component 3b, that is, adjusting the interpupillary distance of the head-mounted display device.

[0032] In an alternative example, the drive mechanism 4 can be an electric drive mechanism 4, which can be driven by a built-in battery or an external power source.

[0033] In an optional example, the drive mechanism 4 is located inside the head-mounted display device. Using an electrically driven mechanism 4 to adjust the interpupillary distance improves the convenience and accuracy of the adjustment. The head-mounted display device provided in this embodiment does not require a knob on the surface, which is more conducive to improving aesthetics and waterproof performance.

[0034] In some alternative implementations, such as Figure 1 As shown, the drive mechanism 4 may include a drive shaft 42 and a motor 43. The drive shaft 42 is connected to the first bracket 2a and the second bracket 2b. The motor 43 and the drive shaft 42 are connected in a transmission connection to drive the first bracket 2a and the second bracket 2b to move closer to each other or further away from each other along the length direction of the drive shaft 42.

[0035] like Figure 5 As shown, the drive shaft 42 may be provided with a threaded structure, such as an external thread. The first bracket 2a and the second bracket 2b may be provided with a threaded structure, such as a threaded hole 212. The drive shaft 42 is threadedly connected to at least one of the first bracket 2a and the second bracket 2b. The motor 43 can drive the drive shaft 42 to rotate, thereby driving at least one of the first bracket 2a and the second bracket 2b to move along the length direction of the drive shaft 42.

[0036] In some alternative implementations, the drive mechanism 4 may be a stepper motor 43, which has more precise speed control capability than a traditional DC motor 43. The number of rotation steps of the motor 43 can be controlled by adjusting the input voltage frequency.

[0037] The stepper motor can be a two-phase permanent magnet stepper motor 43, whose step angle can be adjusted according to the travel and efficiency of the interpupillary distance adjustment. For example, by selecting a two-phase permanent magnet stepper motor 43 with an output pulse frequency between 2000 and 5000 Hz, the step angle can be selected between 15° and 20°, which can accurately and efficiently adjust the position of the optical components.

[0038] In some alternative implementations, such as Figure 1 and Figure 2 As shown, the rotating shaft of motor 43 can be coaxially connected to the transmission shaft 42, meaning the axes of motor 43 and transmission shaft 42 can be located on the same straight line. The rotating shaft of motor 43 and transmission shaft 42 can be directly connected, for example, by welding, bonding, or plugging. They can also be indirectly connected. The sequential coaxial connection of motor 43 and transmission shaft 42 along a straight line fully utilizes the internal space of the head-mounted display device, which helps to reduce the height and thickness of the device.

[0039] In some exemplary embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the drive mechanism 4 also includes a reducer 44. The input shaft of the reducer 44 is coaxially connected to the rotating shaft of the motor 43, and the output shaft of the reducer 44 is coaxially connected to the transmission shaft 42. By setting the reducer 44, the reduction ratio is adjusted, the driving torque of the motor 43 is increased, and the rotational speed of the transmission shaft 42 is controlled.

[0040] The reduction ratio of the reducer 44 can be greater than or equal to 15, for example, a reduction ratio of 20. When the reduction ratio of the reducer 44 is 20, if the speed of the motor 43 is 100RPS, the actual output speed of the drive shaft 42 is 5RPS. At this time, the driving torque can be increased by more than 10 times, and the stroke of the first bracket 2a and the second bracket 2b connected to the drive shaft 42 is easier to control.

[0041] In some exemplary embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the axes of the drive shaft 42, the input shaft and output shaft of the reducer 44, and the rotating shaft of the motor 43 can be located on the same straight line. The drive shaft 42, the reducer 44, and the motor 43 extend along a straight line, such as along the width direction of the head-mounted display device. The width direction of the head-mounted display device is the direction of the wearer's face width, which can easily accommodate the sequentially arranged drive shaft 42, reducer 44, and motor 43.

[0042] In some optional examples, such as Figure 1As shown, both the first bracket 2a and the second bracket 2b may include a transmission component 21 and a sliding component 22. The transmission component 21 is threaded to the transmission shaft 42, and the sliding component 22 is connected to the transmission component 21. The sliding component 22 of the first bracket 2a is connected to the first optical component 3a, and the sliding component 22 of the second bracket 2b is connected to the second optical component 3b. The sliding components 22 of the first bracket 2a and the second bracket 2b can slide on the crossbeam 1 and can respectively drive the first optical component 3a and the second optical component 3b to move.

[0043] In some optional examples, the first bracket 2a and the second bracket 2b can be symmetrically arranged on the left and right sides of the drive shaft 24. The sliding components 22 of the first bracket 2a and the second bracket 2b can slide on the crossbeam 1 and can respectively drive the first optical component 3a and the second optical component 3b to move closer to each other or further away from each other along the length direction of the drive shaft 42.

[0044] In some optional examples, the crossbeam 1 has a limiting function on the sliding component 22. It restricts the sliding component 22 to slide only along the length of the crossbeam 1, but not to rotate around it. Therefore, during the rotation of the drive shaft 42, the sliding component 22 and the drive component 21 do not rotate with the drive shaft 42, but move along the length of the crossbeam 1. Specifically, when the drive shaft 42 rotates in the forward direction, it can drive the sliding component 22 and the drive component 21 to move in a first direction; when the drive shaft 42 rotates in the reverse direction, it can drive the same sliding component 22 and the drive component 21 to move in a second direction. The first and second directions are opposite directions.

[0045] In some optional examples, the sliding component 22 includes a slider 223, and the crossbeam 1 includes a groove 111, with the slider 223 slidably connected to the corresponding groove 111 of the crossbeam 1. The groove 111 extends along the length of the crossbeam 1, and the slider 223 is embedded in the groove 111 of the crossbeam 1, which restricts the direction and distance of movement of the slider 223.

[0046] In some optional examples, the crossbeam 1 is provided with a set of sliding grooves 11 corresponding to the first support 2a and the second support 2b, and each set of sliding grooves 11 includes two sliding grooves 111 spaced apart on the crossbeam 1. The first support 2a and the second support 2b are each provided with a slider 223 at both ends along the sliding direction, and the two sliders 223 are slidably connected to the corresponding sliding grooves 111. Providing sliders 223 at both ends of the supports allows the first support 2a and the second support 2b to slide more smoothly along the sliding grooves of the crossbeam 1, preventing any tilting.

[0047] In some optional examples, such as Figure 1As shown, the sliding assembly 22 includes a slider 223, which can be fixedly connected to the corresponding first optical component 3a or second optical component 3b. The fixed connection method includes any one of plug-in, threaded connection, welding, interference fit, and bonding. For example, the groove 111 on the crossbeam 1 can be a through groove, and the slider 223 and the first optical component 3a or the second optical component 3b are fixedly connected by a connector 9, which can be a bolt. When sliders 223 are provided at both ends of the sliding assembly 22 along its length, the two sliders 223 can be fixedly connected to the first optical component 3a or the second optical component 3b respectively by the connector 9, thereby enhancing the connection strength and stability of the connection structure between the sliding assembly 22 and the first optical component 3a or the second optical component 3b.

[0048] In some optional examples, the drive mechanism 4 may also include a mounting housing 41. The mounting housing 41 is connected to the crossbeam 1, and at least one guide post 45 is provided on the mounting housing 41. The guide post 45 is parallel to the drive shaft 42, so that at least one of the first bracket 2a and the second bracket 2b can move along the direction of the guide post 45. The guide post 45 guides the bracket and defines the direction of movement of the bracket.

[0049] In some alternative examples, the reducer 44 of the drive mechanism 4 can be fixedly connected to the mounting housing 41, while the motor 43 can be fixedly connected to either the mounting housing 41 or the reducer 44.

[0050] In some optional examples, the mounting housing 41 may be provided with mounting portions for the drive shaft 42. For example, the mounting housing 41 may have two mounting portions corresponding to the drive shaft 42, and the mounting portions may include bearings. Both sides of the drive shaft 42 may be mounted on bearings, thereby reducing rotational resistance, allowing the entire motor 43 to output greater torque, while the bracket can withstand more external loads.

[0051] In some optional examples, the mounting shell 41 extends along the length of the crossbeam 1, and two guide posts 45 are provided on the mounting shell 41. The two guide posts 45 are arranged alternately along the length of the mounting shell 41, and the first bracket 2a and the second bracket 2b are slidably connected to the corresponding guide posts 45.

[0052] In some optional examples, the reducer 44 and the motor 43 are located at one end of the mounting housing 41 along its length. For example, one end of the mounting housing 41 is provided with a motor mounting platform, and the motor 43 or the reducer 44 can be connected to the motor mounting platform by any of the following connection methods: adhesive, threaded connection, and snap-fit.

[0053] In some optional examples, such as Figure 5As shown, the transmission component 21 of the bracket can be provided with a guide hole 211 and a threaded hole 212. The guide post 45 can be provided through the guide hole 211, and the transmission shaft 42 can be provided with an external thread, which is threadedly connected to the threaded hole 212 on the transmission component 21. The transmission component 21 and the sliding component 22 are fixedly connected. Under the action of the motor 43, the rotation of the transmission shaft 42 can drive the transmission component 21 to move along the guide post 45, and the transmission component 21 can drive the sliding component 22 to move.

[0054] In some optional examples, the transmission assembly 21 and the sliding assembly 22 are detachably connected, and the detachable connection may include any one of plug-in, snap-fit, or threaded connection. The transmission assembly 21 and the sliding assembly 22 may also be non-detachably connected, such as by bonding or welding. The transmission assembly 21 and the sliding assembly 22 may also be a single component.

[0055] In some optional examples, the transmission component 21 may be threadedly connected to the sliding component 22. The length direction of the transmission component 21 may be perpendicular to the length direction of the sliding component 22, and both ends of the transmission component 21 along its length direction may be fixed to the sliding component 22 by threaded fasteners. The threaded fasteners may be bolts.

[0056] In some optional examples, such as Figure 1 As shown, at least one of the first bracket 2a and the second bracket 2b is provided with a first clearance groove 221. For example, the first clearance groove 221 is provided on the sliding component 22 of the bracket, so that the motor 43 is at least partially located in the first clearance groove 221, thereby making full use of space, realizing a compact design, and helping to reduce the size of the head-mounted display device.

[0057] In some optional examples, the motor 43 is located on one side of the crossbeam 1 relative to its length. The bracket on that side of the crossbeam, such as the second bracket 2b, can be provided with a first clearance groove 221, while the bracket on the other side may not have a first clearance groove 221. Of course, both the first bracket 2a and the second bracket 2b can also be provided with a first clearance groove 221, which is beneficial for product weight reduction.

[0058] In some optional examples, such as Figure 5 As shown, the head-mounted display device also includes at least one elastic limiting component 5. The elastic limiting component 5 is disposed on the crossbeam 1 and elastically abuts against at least one of the first bracket 2a and the second bracket 2b in a direction perpendicular to the length of the crossbeam 1, so that the sliding component 22 of the bracket and the sliding groove 111 are tightly fitted together. The elastic limiting component 5 eliminates assembly gaps, effectively reduces wobbling during bracket sliding, reduces image wobbling during pupil adjustment, and improves the user experience.

[0059] In some optional examples, such as Figure 5As shown, the elastic limiting component 5 may include a fastener and an elastic element. A threaded groove 12 may be provided on the crossbeam 1, and the fastener is threadedly connected to the threaded groove 12 on the crossbeam 1. The fastener can abut against the first bracket 2a or the second bracket 2b via the elastic element 52. The elastic element is disposed between the fastener and the first bracket 2a or the second bracket 2b, and under the action of the fastener, it can apply a constant abutting elastic force to the bracket. By tightening the fastener, the elastic element can be compressed or released, adjusting the force applied to the bracket by the elastic element.

[0060] In some optional examples, the fastener may be a bolt 51. The elastic element may include a washer 52, which abuts directly against the bracket. Foam 53 may also be provided between the washer 52 and the bolt 51. Both the washer 52 and the foam 53 are deformable elastic structures that can provide elastic cushioning and apply elastic force to the bracket stably.

[0061] In some optional examples, such as Figure 1 , Figure 5 and Figure 6 As shown, a first circuit board 31 can be set on the optical component, and a second circuit board 6 is set inside the head-mounted display device. The first circuit board 31 can be connected to the second circuit board 6.

[0062] In some optional examples, the first circuit board 31 can be a flexible circuit board. The second circuit board 6 may have a controller. A second clearance slot 222 may be provided on the first bracket 2a and the second bracket 2b, through which the first circuit board 31 can be disposed to smoothly connect to the second circuit board 6.

[0063] In some optional examples, combined Figure 1 and Figure 6 As shown, the head-mounted display device also includes a ranging component 7 and a ranging mating component 8. The ranging component 7 is disposed on the crossbeam 1. The ranging mating component 8 is disposed on at least one of the first support 2a and the second support 2b. The ranging mating component 8 can be disposed on the transmission assembly 21 of the support or on the sliding assembly 22, for example, the ranging mating component 8 can be disposed on the slider 223. The ranging component 7 is used to detect the distance between itself and the ranging mating component 8. The ranging component 7 can be a TMR sensor, a Hall sensor, etc. The ranging mating component 8 can be a permanent magnet.

[0064] In some optional examples, a second circuit board 6 can be installed on the crossbeam 1, and the ranging component 7 can be electrically connected to the second circuit board 6. The second circuit board 6 can be a PCB circuit board.

[0065] In some optional examples, the motor 43 of the drive mechanism 4 can be a stepper motor 43. With the setting of the ranging component 7 and the ranging mating component 8, it can perform real-time position testing and cooperate with the stepper motor 43 to form a feedback system to realize closed-loop control of the pupil distance.

[0066] In an optional example, the head-mounted display device can employ a stepper motor 43 and a ranging component 7 to achieve closed-loop control of the focusing angle. The ranging component 7 is used to detect the distance between itself and the ranging component, and to monitor the distance between the first support 2a and the second support 2b, or the moving distance of the first support 2a and the second support 2b. The rotation angle and input voltage of the stepper motor have good tracking performance, so the difference between the moving position of the first support 2a and the second support 2b and the target position can be monitored by the ranging component. Based on the difference, a corresponding voltage pulse command is given to the stepper motor to control its rotation angle, moving the first support 2a and the second support 2b to the corresponding position. This dynamic closed-loop feedback system is used to control the virtual image distance of the module.

[0067] In some optional examples, such as Figure 1 As shown, the drive mechanism 4 may include a transmission shaft 42 and a motor 43. The transmission shaft 42 has a first threaded section 421 and a second threaded section 422, with opposite thread directions. The first threaded section 421 is threadedly connected to the first bracket 2a, and the second threaded section 422 is threadedly connected to the second bracket 2b. The transmission shaft 42 can be a single piece, allowing simultaneous driving of the first bracket 2a and the second bracket 2b towards or away from each other by a single motor 43, achieving symmetrical adjustment. The overall structure is simple, with fewer components, reducing costs. In this embodiment, the drive mechanism 4 may also include a reducer 44. The input shaft of the reducer 44 is coaxially connected to the rotating shaft of the motor 43, and the output shaft of the reducer 44 is coaxially connected to the transmission shaft 42. By setting the reducer 44, the reduction ratio is adjusted, increasing the driving torque of the motor 43, allowing a single motor 43 to simultaneously drive the first bracket 2a and the second bracket 2b to move.

[0068] In some optional examples, the drive mechanism 4 includes two motors 43 and two drive shafts 42 with opposite threads. A first bracket 2a is threaded to one drive shaft 42, and a second bracket 2b is threaded to the other drive shaft 42. One motor 43 is driven by one drive shaft 42, and the other motor 43 is driven by the other drive shaft 42. The two motors 43 can be located at opposite ends of the crossbeam 1, and can drive the first bracket 2a and the second bracket 2b to move respectively.

[0069] In some optional examples, such as Figure 7As shown, both the first optical component 3a and the second optical component 3b may include an image source component 32 and an optical element. The image source component 32 can provide image information for the head-mounted display device, and the optical element can adjust the light. In the head-mounted display device, the light emitted by the image source component 32 can be projected onto the optical element, and the optical element can adjust the light path of the light emitted by the image source component 32 so that the light is projected onto the eyes of the user wearing the head-mounted display device, allowing the user to view the image information.

[0070] In some optional examples, the optical elements may include a beam splitter 33 and a reflector 34. The image source assembly 32 can project light in a vertical direction. The beam splitter 33 can refract the light emitted by the image source assembly 32 and project the light in a second direction. The reflector 34 reflects the light projected by the beam splitter 33 and projects the light in a first direction. The light can pass through the beam splitter 33 and be projected into the user's eye a when the user wears the head-mounted display device, thereby forming a virtual image in the user's field of vision.

[0071] Understandably, the optical elements of an optical assembly are not limited to the types of optical elements mentioned above, but can also include optical elements such as stereo beam splitters, prisms, freeform optical components, and optical waveguide devices.

[0072] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this disclosure to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations therein.

Claims

1. A head-mounted display device, comprising: The application relates to a driving mechanism for a zoom lens, which comprises a crossbeam, a first support and a second support, a first optical assembly and a second optical assembly, a driving mechanism, wherein the first support and the second support are movably arranged on the crossbeam, the first optical assembly is connected to the first support, the second optical assembly is connected to the second support, the driving mechanism is arranged on the crossbeam, the driving mechanism comprises a transmission shaft and a motor, the transmission shaft is connected to the first support and the second support, the rotating shaft of the motor is coaxially connected to the transmission shaft to drive the first support and the second support to move towards each other or move away from each other along the length direction of the transmission shaft. The driving mechanism further comprises a speed reducer, the input shaft of the speed reducer is coaxially connected to the rotating shaft of the motor, and the output shaft of the speed reducer is coaxially connected to the transmission shaft. The first support and the second support each comprise a transmission assembly and a sliding assembly. The transmission assembly is screw-connected to the transmission shaft. The sliding assembly is connected to the transmission assembly, the sliding assembly of the first support and the second support is further connected to the first optical assembly and the second optical assembly respectively, the sliding assembly of the first support and the second support can slide on the crossbeam and can drive the first optical assembly and the second optical assembly to move respectively.

2. The head-mounted display device of claim 1, wherein, The sliding assembly comprises a sliding block.

3. The head-mounted display device of claim 1, wherein, The crossbeam comprises a sliding groove, and the sliding block is slidably connected to the corresponding sliding groove of the crossbeam. The driving mechanism further comprises a mounting shell. The mounting shell is connected to the crossbeam.

4. The head-mounted display device of claim 3, wherein, At least one guide column is arranged on the mounting shell and parallel to the transmission shaft, so that at least one of the first support and the second support can move along the extension direction of the guide column. At least one of the first support and the second support is provided with a first avoiding groove.

5. The head-mounted display device of claim 1, wherein, The motor is at least partially located in the first avoiding groove. At least one elastic limiting assembly is further included. The elastic limiting assembly is arranged on the crossbeam.

6. The head-mounted display device of claim 1, wherein, The elastic limiting assembly elastically abuts against at least one of the first support and the second support in a direction perpendicular to the length of the crossbeam. The elastic limiting assembly comprises a fastener and an elastic member.

7. The head-mounted display device of claim 1, wherein, The fastener is screw-connected to the crossbeam, and the fastener abuts against the first support or the second support through the elastic member. A distance measuring component and a distance measuring matching member are further included. The distance measuring component is arranged on the crossbeam.

8. The head-mounted display device of claim 7, wherein, The distance measuring matching member is arranged on at least one of the first support and the second support. The driving mechanism adopts any one of the following arrangement modes:

9. The head-mounted display device of claim 1, wherein, The driving mechanism comprises the transmission shaft and the motor, the transmission shaft has a first threaded section and a second threaded section, the screw rotation directions of the first threaded section and the second threaded section are opposite, the first threaded section is screw-connected to the first support, and the second threaded section is screw-connected to the second support. ​ ​ 10. The head-mounted display device of any of claims 1-9, wherein, ​ ​ The driving mechanism comprises two motors and two transmission shafts, the threads on the two transmission shafts are opposite in rotation direction, the first support is threadedly connected to one of the transmission shafts, the second support is threadedly connected to the other transmission shaft, one of the motors is in driving connection with one of the transmission shafts, and the other motor is in driving connection with the other transmission shaft.

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