Optical waveguide structure and AR head-mounted device
By providing a light absorbing layer on the outer peripheral surface, inner surface and outer edge of the optical waveguide lens and an anti-reflection structure, the problem of contrast reduction caused by stray light in the optical waveguide lens is solved, and the contrast improvement is achieved.
Patent Information
- Application Number
- CN202422443758.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-10-09
AI Technical Summary
When existing optical waveguide lenses propagate image light, stray light is prone to appear, resulting in a decrease in contrast.
A peripheral light absorbing layer, an inner light absorbing layer and an outer light absorbing layer are provided on the outer peripheral surface, inner surface and outer edges of the optical waveguide lens, and an anti-reflection structure is provided therebetween, including a micro-nano structure or an inline structure of the light absorbing material to absorb image light to reduce reflection.
Effectively reduce stray light entering the user's eyes and improve the contrast of optical waveguide lenses.
Smart Images
Figure CN223123262U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of AR, and particularly relates to an optical waveguide structure and an AR head-mounted device. Background Art
[0002] Augmented Reality (AR) technology uses a micro display screen and optical elements to form an optical display. Without affecting the user's observation of the external environment, the image generated by the micro display screen is projected into the user's eyes, realizing the superposition and fusion of the real world and virtual images, and having great application prospects in the fields of education, entertainment, industry, etc.
[0003] At present, the optical waveguide lens is one of the mainstream technical solutions for realizing augmented reality. When the image light generated by the micro display screen propagates in the optical waveguide lens, part of the light energy will propagate to the outer peripheral surface of the side of the optical waveguide lens, be reflected by the outer peripheral surface of the optical waveguide lens and return to the optical waveguide lens, and enter the user's eyes through the diffraction of the coupling grating, forming uncontrollable stray light during viewing, thereby reducing the contrast of the optical waveguide lens and seriously affecting the use. Summary of the Utility Model
[0004] The purpose of the utility model is to provide an optical waveguide structure and an AR head-mounted device, aiming to solve the problem that the existing optical waveguide lens is prone to stray light and the contrast is reduced.
[0005] The utility model discloses an optical waveguide structure, which includes an optical waveguide lens, a circumferential light absorption layer arranged on the outer peripheral surface of the optical waveguide lens, an inner light absorption layer adjacent to the circumferential light absorption layer arranged at the edge of the inner side surface of the optical waveguide lens, and an outer light absorption layer adjacent to the circumferential light absorption layer arranged at the edge of the outer side surface of the optical waveguide lens.
[0006] As an improvement, an anti-reflection structure is respectively arranged between the circumferential light absorption layer, the inner light absorption layer, the outer light absorption layer and the optical waveguide lens.
[0007] As an improvement, the anti-reflection structure is a micro-nano structure arranged on the optical waveguide lens.
[0008] As an improvement, the micro-nano structure includes a plurality of regular or irregular depressions arranged on the optical waveguide lens.
[0009] As an improvement, the anti-reflection structure is an embedded structure made of a light absorption material, and is arranged inside the circumferential light absorption layer close to the optical waveguide lens / inside the inner light absorption layer close to the optical waveguide lens / inside the outer light absorption layer close to the optical waveguide lens.
[0010] As an improvement, the embedded structure includes a plurality of embedded monomers arranged at intervals.
[0011] As an improvement, the circumferential light-absorbing layer, the inner light-absorbing layer, and the outer light-absorbing layer are bonding layers or spraying layers.
[0012] As an improvement, the circumferential light-absorbing layer, the inner light-absorbing layer, and the outer light-absorbing layer have the same refractive index as the optical waveguide lens.
[0013] The present utility model also discloses an AR head-mounted device, which includes a device main body and an optical waveguide structure arranged on the device main body.
[0014] As an improvement, the AR head-mounted device is an AR glasses, and the device main body is a frame; or, the AR head-mounted device is an AR all-in-one machine, the device main body is the host of the AR all-in-one machine, and the optical waveguide structure is arranged on the host.
[0015] Due to the adoption of the above technical solution, the optical waveguide structure of the present utility model includes an optical waveguide lens, a circumferential light-absorbing layer arranged on the outer peripheral surface of the optical waveguide lens, an inner light-absorbing layer adjacent to the circumferential light-absorbing layer provided at the edge of the inner side surface of the optical waveguide lens, and an outer light-absorbing layer adjacent to the circumferential light-absorbing layer provided at the edge of the outer side surface of the optical waveguide lens; the AR head-mounted device of the present utility model includes a device main body and an optical waveguide structure arranged on the device main body. Since a circumferential light-absorbing layer is provided on the outer peripheral surface of the optical waveguide lens, it can absorb the image light propagating to the outer peripheral surface of the optical waveguide lens, reduce the reflection of the image light, thereby reducing the stray light entering the user's eyes, and can improve the contrast of the optical waveguide lens. At the same time, an inner light-absorbing layer adjacent to the circumferential light-absorbing layer is provided at the edge of the inner side surface of the optical waveguide lens, and an outer light-absorbing layer adjacent to the circumferential light-absorbing layer is provided at the edge of the outer side surface of the optical waveguide lens. The inner light-absorbing layer can absorb the image light propagating to the edge of the inner side surface of the optical waveguide lens, and the outer light-absorbing layer can absorb the image light propagating to the edge of the outer side surface of the optical waveguide lens. Moreover, the inner light-absorbing layer and the outer light-absorbing layer can absorb the residual image light reflected from the outer peripheral surface of the optical waveguide lens again, further reducing the stray light entering the user's eyes, and solving the problem that the existing optical waveguide lens is prone to stray light and resulting in reduced contrast. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a schematic structural diagram of the optical waveguide structure of the present utility model;
[0017] Figure 2 is a schematic diagram of the working principle of the optical waveguide structure of the present utility model;
[0018] Figure 3It is a partial cross-sectional view of the side of the optical waveguide structure according to the first embodiment of the present invention;
[0019] Figure 4 It is a partial cross-sectional view of the side of the optical waveguide structure according to the second embodiment of the present invention;
[0020] Figure 5 It is a partial cross-sectional view of the side of the optical waveguide structure according to the third embodiment of the present invention;
[0021] Among them, 11, optical waveguide lens; 12, coupling grating; 13, output grating; 14, circumferential light-absorbing layer; 15, inner light-absorbing layer; 16, outer light-absorbing layer; 17, regular-shaped depression; 18, irregular-shaped depression; 19, embedded monomer. Detailed implementation manners
[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0023] Figures 1 to 5 It is a schematic structural diagram of the optical waveguide structure of the present invention, where Figure 1 It shows a schematic structural diagram of the optical waveguide structure of the present invention, Figure 2 It shows a schematic diagram of the working principle of the optical waveguide structure of the present invention, Figure 3 It shows a partial cross-sectional view of the side of the optical waveguide structure according to the first embodiment of the present invention, Figure 4 It shows a partial cross-sectional view of the side of the optical waveguide structure according to the second embodiment of the present invention, Figure 5 It shows a partial cross-sectional view of the side of the optical waveguide structure according to the third embodiment of the present invention. For the convenience of description, only the parts related to the present invention are shown in the figure.
[0024] It should be noted that if the directional indications (such as up, down, front, back, etc.) involved in the present invention are only used to explain the relative positional relationship between components in a specific posture, if this specific posture changes, then the directional indications will also change accordingly; if the descriptions such as "first", "second", etc. involved in the present invention are used, then the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.
[0025] By Figures 1 to 5It can be seen that the optical waveguide structure of the present utility model includes an optical waveguide lens 11. The side of the optical waveguide lens 11 close to the user's eyes is defined as the inner side, and the other side away from the user's eyes is defined as the outer side. It further includes a circumferential light-absorbing layer 14 provided on the outer peripheral surface of the optical waveguide lens 11. An inner light-absorbing layer 15 adjacent to the circumferential light-absorbing layer 14 is provided at the edge of the inner side surface of the optical waveguide lens 11, and an outer light-absorbing layer 16 adjacent to the circumferential light-absorbing layer 14 is provided at the edge of the outer side surface of the optical waveguide lens 11.
[0026] For the convenience of understanding, the working principle of the optical waveguide structure is described as follows in combination with the attached drawings:
[0027] After the image light generated by the micro display screen enters the optical waveguide lens 11 through the coupling grating 12 for propagation and pupil expansion, it is then coupled out to the user's eyes by the coupling-out grating 13. In the optical waveguide lens 11, a part of the image light ( Figure 2 as shown by the solid arrow in the figure) propagates to the outer peripheral surface of the side of the optical waveguide lens 11, is reflected by the outer peripheral surface and returns to the optical waveguide lens 11, and diffracts through the coupling-out grating 13 to enter the user's eyes to form uncontrollable stray light during viewing (shown by the dashed arrow in the figure), resulting in a decrease in the contrast of the optical waveguide lens 11. Since the circumferential light-absorbing layer 14 is provided on the outer peripheral surface of the optical waveguide lens 11, it can absorb the image light propagating to the outer peripheral surface of the optical waveguide lens 11, reduce the reflection of the image light, thereby reducing the stray light entering the user's eyes, and can improve the contrast of the optical waveguide lens 11. At the same time, an inner light-absorbing layer 15 adjacent to the circumferential light-absorbing layer 14 is provided at the edge of the inner side surface of the optical waveguide lens 11, and an outer light-absorbing layer 16 adjacent to the circumferential light-absorbing layer 14 is provided at the edge of the outer side surface of the optical waveguide lens 11. The inner light-absorbing layer 15 can absorb the image light propagating to the edge of the inner side surface of the optical waveguide lens 11, and the outer light-absorbing layer 16 can absorb the image light propagating to the edge of the outer side surface of the optical waveguide lens 11. Moreover, the inner light-absorbing layer 15 and the outer light-absorbing layer 16 can absorb the residual image light reflected by the outer peripheral surface of the optical waveguide lens 11 again, further reducing the stray light entering the user's eyes. The optical waveguide structure of the present utility model solves the problem that the existing optical waveguide lens is prone to stray light, resulting in a decrease in contrast.
[0028] In the present utility model, in order to facilitate the absorption of image light and further improve the contrast, an anti-reflection structure is respectively provided between the circumferential light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 and the optical waveguide lens 11, which can reduce the reflection of image light.
[0029] Specifically, the anti-reflection structure is a micro-nano structure provided on the optical waveguide lens 11. The roughness of the outer peripheral surface of the optical waveguide lens 11, the edge of the inner side surface of the optical waveguide lens 11, and the edge of the outer side surface of the optical waveguide lens 11 can be increased through the micro-nano structure to reduce light reflection.
[0030] As shown Figure 3 in the figure, the micro-nano structure includes a plurality of regular depressions 17 provided on the optical waveguide lens 11. Of course, the micro-nano structure can also be set to the following structure, including a plurality of irregular depressions 18 provided on the optical waveguide lens 11, as shown Figure 4 in the figure.
[0031] In some other embodiments, the anti-reflection structure can also be an embedded structure made of light-absorbing material, provided inside the inner light-absorbing layer 15 close to the optical waveguide lens 11 on the side of the peripheral light-absorbing layer 14 / inside the inner light-absorbing layer 15 close to the optical waveguide lens 11 / inside the outer light-absorbing layer 16 close to the optical waveguide lens 11, as shown Figure 5 in the figure. Specifically, the embedded structure includes a plurality of embedded monomers 19 arranged at intervals, and the embedded monomer 19 can be a regular shape or an irregular shape; of course, the embedded structure can also be set to an integral structure, such as a grid plate.
[0032] In the present utility model, in order to further improve the light absorption performance and reduce the reflection of image light, the refractive indices of the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 and the optical waveguide lens 11 are the same, and the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 are made of the same light-absorbing material. Common light-absorbing materials include ferromagnetic materials (such as ferrite, nickel-zinc ferrite, etc.), graphite, metals (such as iron, copper, aluminum, etc.), wave-absorbing materials (such as polystyrene foam, polyurethane foam, polyurethane composite materials, etc.) and carbon materials (such as carbon fiber, carbon black, etc.).
[0033] Specifically, the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 are bonding layers, and are provided on the optical waveguide lens 11 by means of pasting, hot pressing, etc. Of course, the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 are spraying layers, and are provided on the optical waveguide lens 11 by means of spraying. When the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 are spraying layers, the anti-reflection structure is the micro-nano structure provided on the optical waveguide lens 11.
[0034] Generally, the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 are split structures, and are respectively installed during fixed installation, which is convenient for operation. Of course, the peripheral light-absorbing layer 14, the inner light-absorbing layer 15, the outer light-absorbing layer 16 can also be an integral structure connected as one body, and it is easy for the three to be connected as one body during spraying.
[0035] The present utility model also discloses an AR head-mounted device, which includes a device main body, the above-mentioned optical waveguide structure provided on the device main body, and a support structure connected to the setting main body, and the AR head-mounted device can be worn on the user's head through the support structure.
[0036] Specifically, the AR head-mounted device is an AR glasses, the device body is a frame, and the support structure includes a left temple and a right temple respectively installed on both sides of the frame. Usually, two groups of the above-mentioned optical waveguide structures are installed on the frame. Of course, the two groups of the above-mentioned optical waveguide structures can also be connected as a whole.
[0037] In some other embodiments, the AR head-mounted device can also be an AR all-in-one machine, the device body is the host of the AR all-in-one machine, the optical waveguide structure is arranged on the side of the shell of the host away from the user's head, and the support structure is a head-mounted structure connected to the host. Usually, the head-mounted structure is a strap or a headband.
[0038] The above are only some embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An optical waveguide structure, comprising an optical waveguide lens, characterized in that, It further includes a circumferential light-absorbing layer disposed on the outer peripheral surface of the optical waveguide lens, an inner light-absorbing layer adjacent to the circumferential light-absorbing layer is provided at the edge portion of the inner side surface of the optical waveguide lens, and an outer light-absorbing layer adjacent to the circumferential light-absorbing layer is provided at the edge portion of the outer side surface of the optical waveguide lens.
2. The optical waveguide structure according to claim 1, wherein An anti-reflection structure is respectively provided between the circumferential light-absorbing layer, the inner light-absorbing layer, the outer light-absorbing layer and the optical waveguide lens.
3. The optical waveguide structure according to claim 2, wherein, The anti-reflection structure is a micro-nano structure disposed on the optical waveguide lens.
4. The optical waveguide structure according to claim 3, wherein, The micro-nano structure includes a plurality of regular-shaped depressions or irregular-shaped depressions disposed on the optical waveguide lens.
5. The optical waveguide structure according to claim 2, characterized in that, The anti-reflection structure is an embedded structure made of a light-absorbing material, and is disposed inside the circumferential light-absorbing layer close to the optical waveguide lens / inside the inner light-absorbing layer close to the optical waveguide lens / inside the outer light-absorbing layer close to the optical waveguide lens.
6. The optical waveguide structure according to claim 5, characterized in that, The embedded structure includes a plurality of embedded monomers disposed at intervals.
7. The optical waveguide structure according to any one of claims 1 to 6, characterized in that, The circumferential light-absorbing layer, the inner light-absorbing layer, and the outer light-absorbing layer are bonding layers or spray coatings.
8. The optical waveguide structure according to claim 7, wherein The circumferential light-absorbing layer, the inner light-absorbing layer, and the outer light-absorbing layer have the same refractive index as the optical waveguide lens.
9. An AR head-mounted device, comprising a device main body, characterized in that, It further includes the optical waveguide structure according to any one of claims 1 to 8 disposed on the device body.
10. The AR head-mounted device according to claim 9, wherein The AR head-mounted device is an AR glasses, and the device body is a frame; or, the AR head-mounted device is an AR all-in-one machine, the device body is the host of the AR all-in-one machine, and the optical waveguide structure is disposed on the host.