Head-mounted display devices

Abstract

This invention discloses a head-mounted display device, comprising a main body and a wearing part. The main body includes an optical engine and two rotatable optical waveguides. The optical engine emits light rays into the optical waveguides. The wearing part is connected to the main body. The relative rotation of the two optical waveguides changes the incident angle of the light rays emitted from the optical engine onto the waveguides. This invention aims to provide a solution for adjusting the fusion distance of binocular images, applicable to both single-optical-engine and dual-optical-engine devices.

Description

Technical Field

[0001] This invention relates to the field of near-eye displays, and particularly to a head-mounted display device. Background Technology

[0002] Head-mounted display devices typically include Virtual Reality (VR) headsets, Augmented Reality (AR) headsets, and Mixed Reality (MR) headsets. Currently, in head-mounted display devices, image algorithms can be used to adjust the fusion distance of the binocular images, allowing the human eye to perceive distance. However, this method has limited applicability and cannot be used with single-vision devices. Summary of the Invention

[0003] The main objective of this invention is to propose a head-mounted display device that provides a solution for adjusting the fusion distance of binocular images, applicable to both single-optical-machine and dual-optical-machine devices.

[0004] To achieve the above objectives, the head-mounted display device proposed in this invention includes:

[0005] The main body of the device includes an optical engine and two relatively rotatable optical waveguides. The optical engine is used to emit light rays into the optical waveguides; wherein, the relative rotation of the two optical waveguides can change the incident angle of the light rays emitted from the optical engine on the optical waveguides; and

[0006] The wearing part is connected to the main body of the device.

[0007] Optionally, an optical engine is provided on the adjacent side of the two optical waveguides, and a beam splitting unit is provided downstream of the optical path of the light emitted from the optical engine. The beam splitting unit is used to split the light emitted from the optical engine into two parts that can be incident on the two optical waveguides respectively.

[0008] Optionally, when the two optical waveguides rotate relative to each other, they can rotate by the same angle relative to the distribution direction of the two optical waveguides, so that the incident angles of the two parts of light emitted from the beam splitting unit on the corresponding optical waveguides are equal.

[0009] Optionally, both optical waveguides are provided with connecting gears on their adjacent sides, and the connecting gears of the two optical waveguides mesh with each other.

[0010] Optionally, each of the optical waveguides has a reference surface extending along its incident surface to the opposite of another optical waveguide, the incident surface of the optical waveguide and the opposite reference surface being set at a reference angle, the reference angle being 0 to 5 degrees.

[0011] Optionally, the head-mounted display device has five adjustable positions for the reference angle, and the reference angles corresponding to the five positions are 3°, 1.2°, 0.7°, 0.5° and 0°, respectively.

[0012] Optionally, the main body of the device further includes a mounting component disposed on the adjacent side of the two optical waveguides, and both optical waveguides are rotatably connected to the mounting component via a rotating shaft.

[0013] Optionally, the mounting component includes a shielding portion located on the front side of the rotating shaft and two connecting portions respectively connected to the upper and lower sides of the shielding portion, with the two ends of the rotating shaft respectively connected to the two connecting portions.

[0014] Optionally, the shielding portion and any of the optical waveguides are spaced apart in the front-to-back direction.

[0015] Optionally, the wearing part is configured as a temple structure, and the angle between the wearing part and the optical waveguide is adjustable.

[0016] Optionally, the wearing part is configured as a strap structure, and the tightness of the wearing part is adjustable.

[0017] In this invention, the relative rotation of the two optical waveguides changes the relative position of the optical engine and the waveguides. Thus, while the outgoing light from the optical engine remains constant, the incident angle of the outgoing light on the waveguides also changes, consequently altering the outgoing angle of the outgoing light from the waveguides. It can be understood that the binocular fusion distance is the distance from the intersection of the outgoing light from the waveguides and the axis of symmetry between the two waveguides to the line connecting the pupils of both eyes. Since the user's interpupillary distance can be considered constant, when the outgoing angle of the outgoing light from the waveguides changes, the first included angle will change accordingly, causing a change in the binocular fusion distance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the head-mounted display device of the present invention when the binocular fusion distance is infinitely far;

[0020] Figure 2 This is a schematic diagram of the structure of an embodiment of the head-mounted display device of the present invention when the binocular fusion distance is limited;

[0021] Figure 3This is a schematic diagram of the optical path of the head-mounted display device of the present invention;

[0022] Figure 4 This is another optical path diagram of the head-mounted display device of the present invention.

[0023] Figure 5 This is a partial structural schematic diagram of an embodiment of the head-mounted display device of the present invention;

[0024] Figure 6 for Figure 5 A schematic diagram of the structure from another perspective;

[0025] Figure 7 This is a schematic diagram illustrating the use of an embodiment of the head-mounted display device of the present invention.

[0026] Explanation of icon numbers:

[0027] label name label name 100 Optical mechanism 400 Installation components 200 Optical waveguide 410 shielding part 210 Connecting gears 420 Connection part 220 Mounting holes 500 pivot 300 Spectrometer α Reference angle

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] This invention proposes a head-mounted display device.

[0033] In one embodiment of the present invention, such as Figures 1 to 3 As shown, the head-mounted display device includes:

[0034] The main body of the device includes an optomechanism 100 and two relatively rotatable optical waveguides 200. The optomechanism 100 emits light into the optical waveguides 200; wherein, the relative rotation of the two optical waveguides 200 can change the incident angle γ1 of the light emitted by the optomechanism 100 onto the optical waveguides 200; and

[0035] The wearing part (not shown) is connected to the main body of the device.

[0036] In the technical solution of this invention, the relative rotation of the two optical waveguides 200 changes the relative position of the optical engine 100 and the optical waveguides 200. Thus, while the emitted light from the optical engine 100 remains constant, the incident angle γ1 of the emitted light on the optical waveguide 200 will also change, causing the emission angle γ2 of the emitted light from the optical waveguide 200 to change accordingly. It can be understood that the binocular fusion distance D is the distance from the intersection of the emitted light L2 of the optical waveguide 200 and the axis of symmetry L3 between the two optical waveguides 200 to the line L4 connecting the pupils of both eyes. The binocular fusion distance D, the first angle θ formed by the emitted light L2 and the axis of symmetry L3 between the two optical waveguides 200, and the user's interpupillary distance satisfy the following: Since the user's interpupillary distance PID can be regarded as a constant, when the emission angle γ2 of the outgoing light L2 of the optical waveguide 200 changes, the first included angle θ will change accordingly, causing the binocular fusion distance D to change.

[0037] In existing technologies, image algorithms are generally used to adjust the binocular fusion distance. However, in head-mounted display devices with a single optical engine, since a single optical engine projects images to the left and right eyes of the user simultaneously, the image algorithm cannot make the images displayed to the left and right eyes different. As a result, this method cannot adjust the binocular fusion distance of the single optical engine solution.

[0038] The technical solution of this invention sets the two optical waveguides 200 to be rotatable relative to each other. By rotating the optical waveguides 200, the relative positional relationship between the optical waveguides 200 and the optical engine 100 can be adjusted, thereby adjusting the binocular fusion distance. Although the illustrated embodiment only shows the working principle of the technical solution of this invention on a single optical engine device, the technical solution of this invention is not limited to the structure of a single optical engine device or a dual optical engine 100 device. Those skilled in the art should understand that the technical solution of this invention can be applied to head-mounted display devices configured with either a single optical engine 100 or a dual optical engine 100.

[0039] Without loss of generality, the head-mounted display device of the present invention is a single-optical-engine device. Specifically, an optical engine 100 is provided on the adjacent side of the two optical waveguides 200, and a beam splitting unit 300 is provided downstream of the optical path of the light emitted from the optical engine 100. The beam splitting unit 300 is used to split the light emitted from the optical engine 100 into two parts that can be incident on the two optical waveguides 200 respectively. The single-optical-engine 100 device is lighter than the dual-optical-engine 100 device, resulting in less weight for the user and a better user experience. For example, Figure 3 and Figure 4 As shown, the second included angle β between the light emitted from the beam splitter 300 and the axis of symmetry between the two optical waveguides 200 can be 0, meaning they can be parallel or intersecting. Furthermore, in this embodiment, the second included angle β corresponding to the two beam splitters 300 is set to be equal. Of course, in other embodiments, the second included angle β corresponding to the two beam splitters 300 may not be equal.

[0040] Furthermore, in this embodiment, when the two optical waveguides 200 rotate relative to each other, they can rotate by the same angle relative to their distribution direction, so that the incident angles of the two portions of light emitted from the beam splitting unit 300 on the corresponding optical waveguides 200 are equal. That is, both optical waveguides 200 can rotate relative to the optomechanism 100, and the angles of rotation of both relative to the optomechanism 100 are the same, so that the incident angles of their respective incident light rays L1 are equal. In this way, the virtual image formed by the head-mounted display device will be centered, which can meet the basic display requirements of the head-mounted display device. Alternatively, the rotation of the optical waveguides 200 can be driven by a motor or manually controlled by the user. Of course, in other embodiments, one optical waveguide 200 may remain fixed relative to the frame structure of the device body, while the other optical waveguide 200 may rotate relative to the frame structure of the device body. When the optical waveguide 200 rotates, only the relative position of the optical waveguide 200 and the optomechanical 100 will change. In this way, the incident angles of the two parts of light emitted from the beam splitting unit 300 on the corresponding optical waveguides 200 will be unequal, causing the virtual image formed by the head-mounted display device to be set to the left or right to meet the specific display requirements of the head-mounted display device.

[0041] Furthermore, in this embodiment, as Figure 6 and Figure 7 As shown, both optical waveguides 200 are provided with connecting gears 210 on their adjacent sides, and the connecting gears 210 of the two optical waveguides 200 mesh with each other. It can be understood that the transmission ratio between the connecting gears 210 of the two optical waveguides 200 is 1. Thanks to the meshing transmission between the two connecting gears 210, the two optical waveguides 200 can rotate by the same angle when they rotate relative to each other, so that the incident angles of their respective incident rays are equal. Furthermore, the meshing of the two connecting gears 210 can provide a damping effect between the two optical waveguides 200. When the external force is insufficient to drive the two connecting gears 210 to rotate, the two optical waveguides 200 can be in a relatively stable state, and their relative positions will not change, thereby stably maintaining the corresponding binocular fusion distance. Of course, in other embodiments, a worm gear can be provided between the two optical waveguides 200, and the two optical waveguides 200 can be engaged with opposite sides of the worm gear through their respective connecting gears 210. By pushing the worm gear, the two optical waveguides 200 can be rotated synchronously. Alternatively, the two optical waveguides 200 can be driven by a crank-rocker structure, and a damping element, such as a rubber pad, can be provided between the two optical waveguides 200 to provide a damping effect.

[0042] Furthermore, in this embodiment, as Figures 1 to 4As shown, each of the optical waveguides 200 has a reference surface extending along its incident surface to the opposite side of another optical waveguide 200. The incident surface of the optical waveguide 200 and the opposite reference surface are set at a reference angle α, the magnitude of which is 0 to 5 degrees. It can be understood that when the optical waveguide 200 rotates, the reference angle α changes. In this embodiment, the limitation of the reference angle α is actually a limitation of the rotation range of the optical waveguide 200. Figure 1 The state of the two optical waveguides 200 shown when the reference angle α is 0 is taken as the initial state. The rotation angle of the optical waveguide 200 is defined as the angle of rotation of the optical waveguide 200 relative to the initial state, which is also the angle between the incident surface of the optical waveguide 200 in the current state and the perpendicular line L5 to the axis of symmetry L3 between the two optical waveguides 200. Figure 3 The perpendicular line L5 shown also serves as the bisector of the current reference angle α. Therefore, the rotation angle of the optical waveguide 200 is half of the reference angle α. Furthermore, when the light rays emitted from the beam splitter 300 are parallel to the axis of symmetry between the two optical waveguides 200, i.e., β = 0, the following relationship exists between the first included angle, the reference angle α, and the second included angle: θ = α, where θ is the binocular fusion distance. Corresponding to α∈α0, 5°], the binocular fusion distance can be limited to a suitable range. The adjustment range of the binocular fusion distance corresponding to the rotation range of the optical waveguide 200 defined in this embodiment can meet the user's adjustment needs for the binocular fusion distance, thus ensuring a good user experience.

[0043] The following reference Figure 3 To facilitate understanding, we will elaborate on the relationship between θ and α:

[0044] The incident angle γ1 of the incident ray L1 of the optical waveguide 200 and the exit angle γ2 of the outgoing ray L2 of the optical waveguide 200 satisfy the following relationship: γ2=γ1=α / 2;

[0045] γ3 and γ2 are mutually supplementary, then: θ1=π / 2-γ2=π / 2-α / 2;

[0046] γ4 and α / 2 are complementary to each other, that is: θ2=π / 2-α / 2;

[0047] According to the principle of the sum of the interior angles of a triangle, θ + γ³ + γ⁴ = π, therefore, θ = π - (γ³ + γ⁴) = α.

[0048] Furthermore, in this embodiment, the head-mounted display device has five adjustment levels for the reference angle α, and the reference angle α corresponding to the five levels is 3°, 1.2°, 0.7°, 0.5°, and 0°, respectively. In this embodiment, since the two optical waveguides 200 are connected by a connecting gear 210, different meshing states of the two connecting gears 210 can correspond to different adjustment levels. Thus, when the user manually adjusts the level, tactile feedback is provided to the user to reach different adjustment levels. The interpupillary distance is generally in the range of 58-64mm. Taking an interpupillary distance of 64mm as a reference, ... The five settings correspond to binocular fusion distances of 0.6m, 1.5m, 2.5m, 4m, and infinity, respectively, which should meet the basic needs of most users. Of course, in other embodiments, the adjustment precision of the binocular fusion distance can be improved as needed. Additionally, the reference angle α corresponding to different settings can be adjusted to obtain a suitable binocular fusion distance.

[0049] Furthermore, in this embodiment, as Figure 5 and Figure 6 As shown, the main body of the device also includes a mounting member 400 disposed on the adjacent side of the two optical waveguides 200. Both optical waveguides 200 are rotatably connected to the mounting member 400 via a rotating shaft 500. It can be understood that the optical waveguide 200, sleeved outside the rotating shaft 500, will be constrained radially by the rotating shaft 500. Combined with the engagement between the two connecting gears 210, this allows the optical waveguide 200 to be stably and rotatably engaged. Here, the optical waveguide 200 may simply represent an optical waveguide 200 lens; in this case, the optical waveguide 200 can be movably connected to the frame structure of the main body of the device. Alternatively, the optical waveguide 200 may include a frame and an optical waveguide 200 lens mounted on the frame; in this case, the engagement between the optical waveguide 200 and the mounting member 400, as well as the engagement between the two optical waveguides 200, can be achieved through the frame.

[0050] Furthermore, such as Figures 5 to 7 As shown, the rotating shaft 500 is fixed to the mounting member 400. The optical waveguide 200 is provided with a mounting hole 220, and the optical waveguide 200 is rotatably sleeved on the rotating shaft 500 through the mounting hole 220. There are two rotating shafts 500, with one optical waveguide 200 correspondingly sleeved on the other rotating shaft 500. Of course, in other embodiments, the optical waveguide 200 may have rotating shafts 500 protruding on both its upper and lower sides, and may be rotatably inserted into the shaft hole of the mounting member 400 through the rotating shafts 500. Alternatively, two optical waveguides 200 may be rotatably sleeved on the same rotating shaft 500, similar to a hinge structure.

[0051] Furthermore, in this embodiment, as Figure 5 and Figure 6As shown, the mounting component 400 includes a shielding portion 410 located on the front side of the rotating shaft 500 and two connecting portions 420 respectively connected to the upper and lower sides of the shielding portion 410. Both ends of the rotating shaft 500 are respectively connected to the two connecting portions 420. It should be noted that the term "front side" here refers to the wearing state of the head-mounted display device. In this embodiment, the shielding portion 410 shields the rotating shaft 500 and the two meshing connecting gears 210 on the front side of the head-mounted display device to prevent the mating structure between the two optical waveguides 200 from being exposed, thus affecting the aesthetic appearance of the head-mounted display device.

[0052] Furthermore, in this embodiment, the shielding portion 410 and any of the optical waveguides 200 are spaced apart in the front-to-back direction. Thus, a gap exists between the shielding portion 410 and the optical waveguide 200, preventing interference between the shielding portion 410 and the optical waveguide 200 when the optical waveguide 200 rotates. This allows the width of the shielding portion 410 to be maximized, enabling it to cover a larger area and preventing the rotating shaft 500 and connecting gear 210 from being exposed, thus affecting the aesthetic appearance of the head-mounted display device. It should be noted that the gap between the shielding portion 410 and the optical waveguide 200 allows the optical waveguide 200 to rotate freely within its required range. Of course, in other embodiments, the shielding portion can be positioned close to the optical waveguide, with a notch on the shielding portion to prevent rotation of the optical waveguide.

[0053] Furthermore, in any of the above embodiments, the wearing part is configured as a temple structure, and the angle between the wearing part and the optical waveguide 200 is adjustable. When the optical waveguide 200 only represents the optical waveguide 200 lens and is movably connected to the frame structure of the device body, the wearing part and the frame structure of the device body can be configured as non-adjustable. When the optical waveguide 200 rotates, the relative position between the wearing part and the frame structure of the device body will not change, but the angle between the wearing part and the optical waveguide 200 can change. In this case, the wearing part can be stably worn by the user without adjustment. However, when the optical waveguide 200 includes a frame and an optical waveguide 200 lens mounted on the frame, the wearing part configured as a temple structure will be mounted on the frame. When the two optical waveguides 200 rotate relative to each other, the wearing part will rotate simultaneously. In this case, the angle between the wearing part and the frame needs to be adjustable so that the user can adjust the angle between the two wearing parts to an angle that allows for stable wearing of the head-mounted display device. Of course, in other embodiments, the wearing part can be configured as a strap structure, and the tightness of the wearing part can be adjusted. In this way, even if the relative position between the wearing part and the optical waveguide 200 changes, the wearing stability of the head-mounted display device can be ensured by adjusting the tightness of the wearing part.

[0054] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A head-mounted display device, characterized in that, include: The main body of the device includes an optical engine and two relatively rotatable optical waveguides. The optical engine is used to emit light rays into the optical waveguides; wherein, the relative rotation of the two optical waveguides can change the incident angle of the light rays emitted from the optical engine on the optical waveguides; and Wearing part, connected to the main body of the device; An optical engine is provided on the adjacent side of the two optical waveguides. A beam splitting unit is provided downstream of the optical path of the light emitted from the optical engine. The beam splitting unit is used to split the light emitted from the optical engine into two parts that can be incident on the two optical waveguides respectively. When the two optical waveguides rotate relative to each other, they can rotate by the same angle relative to the distribution direction of the two optical waveguides, so that the incident angles of the two parts of light emitted from the beam splitting unit on the corresponding optical waveguides are equal. Both optical waveguides are provided with connecting gears on their adjacent sides, and the connecting gears of the two optical waveguides mesh with each other.

2. The head-mounted display device as described in claim 1, characterized in that, Each of the optical waveguides has a reference surface extending along its incident surface to the opposite of another optical waveguide, the incident surface of the optical waveguide and the opposite reference surface being set at a reference angle, the reference angle being 0 to 5 degrees.

3. The head-mounted display device as described in claim 2, characterized in that, The head-mounted display device has five adjustable reference angle settings, with the reference angle values ​​corresponding to the five settings being 3°, 1.2°, 0.7°, 0.5°, and 0°, respectively.

4. The head-mounted display device as claimed in claim 1, characterized in that, The main body of the device also includes a mounting component disposed on the adjacent side of the two optical waveguides, and both optical waveguides are rotatably connected to the mounting component via a rotating shaft.

5. The head-mounted display device as described in claim 4, characterized in that, The mounting component includes a shielding part located on the front side of the rotating shaft and two connecting parts respectively connected to the upper and lower sides of the shielding part, with the two ends of the rotating shaft respectively connected to the two connecting parts.

6. The head-mounted display device as claimed in claim 5, characterized in that, The shielding portion and any of the optical waveguides are spaced apart in the front-to-back direction.

7. The head-mounted display device according to any one of claims 1 to 6, characterized in that, The wearing part is configured as a temple structure, and the angle between the wearing part and the optical waveguide is adjustable; Alternatively, the wearing part may be configured as a strap structure, and the tightness of the wearing part may be adjustable.

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