CN210348070U - Optical waveguide structure and AR wearable equipment - Google Patents
Optical waveguide structure and AR wearable equipment Download PDFInfo
- Publication number
- CN210348070U CN210348070U CN201921777401.2U CN201921777401U CN210348070U CN 210348070 U CN210348070 U CN 210348070U CN 201921777401 U CN201921777401 U CN 201921777401U CN 210348070 U CN210348070 U CN 210348070U
- Authority
- CN
- China
- Prior art keywords
- optical waveguide
- refractive index
- holographic grating
- dimensional holographic
- waveguide structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The application discloses optical waveguide structure includes: an optical waveguide substrate; the two-dimensional holographic grating is located on the lower surface of the optical waveguide substrate and formed by a photosensitive substrate, the two-dimensional holographic grating comprises a first refractive index area and a second refractive index area which are arranged according to a preset shape, and the refractive index of the first refractive index area is smaller than that of the second refractive index area. Therefore, the optical waveguide structure comprises the optical waveguide substrate and the two-dimensional holographic grating, the two-dimensional holographic grating comprises the first refractive index area and the second refractive index area, the two-dimensional holographic grating is formed by the photosensitive substrate, and the price of the photosensitive substrate material is low, so that the price of the two-dimensional holographic grating is low, and the cost and the price of the optical waveguide structure are low. In addition, the application also provides an AR wearable device with the advantages.
Description
Technical Field
The application relates to the technical field of augmented reality, in particular to an optical waveguide structure and AR wearable equipment.
Background
The AR (Augmented Reality) technology is a technology for fusing virtual information with a real world, and includes various technical means such as multimedia, three-dimensional modeling, real-time tracking and registration, intelligent interaction, sensing and the like, and virtual information such as characters, images, three-dimensional models, music and the like generated by a computer is applied to the real world after being simulated, and the two kinds of information complement each other, thereby realizing the "enhancement" of the real world.
The optical waveguide structure is the core of the AR wearable device, and is responsible for optically imaging the incident light beam containing the virtual information, so that the virtual information is displayed in front of eyes. The existing grating optical waveguide structure is generally a surface relief grating optical waveguide structure, but the cost of the surface relief grating is high, so that the price of the surface relief grating optical waveguide structure is very high.
Therefore, how to provide an inexpensive optical waveguide structure is a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The purpose of this application is to provide an optical waveguide structure and wearable equipment of AR to make optical waveguide structure and wearable equipment of AR have the advantage of low price.
In order to solve the above technical problem, the present application provides an optical waveguide structure, including:
an optical waveguide substrate;
the two-dimensional holographic grating is located on the lower surface of the optical waveguide substrate and formed by a photosensitive substrate, the two-dimensional holographic grating comprises a first refractive index area and a second refractive index area which are arranged according to a preset shape, and the refractive index of the first refractive index area is smaller than that of the second refractive index area.
Optionally, the second refractive index region in the two-dimensional holographic grating is a diamond, and an acute angle of the diamond is 60 degrees.
Optionally, a grating inclination angle of the two-dimensional holographic grating ranges from 20 degrees to 90 degrees, inclusive.
Optionally, a value of a grating period in the first refractive index region of the two-dimensional holographic grating ranges from 200 nm to 700 nm, inclusive.
Optionally, a value range of a refractive index modulation degree of the second refractive index region and the first refractive index region of the two-dimensional holographic grating is 0.001 to 0.3, inclusive.
Optionally, in a direction from a light incident end to a light output end of the two-dimensional holographic grating, the refractive index modulation degrees of the two-dimensional holographic grating are sequentially increased.
Optionally, the photosensitive substrate is any one of a silver salt photosensitive substrate, a polypropylene photosensitive substrate, and a liquid crystal polymer photosensitive substrate.
Optionally, the thickness of the photosensitive substrate ranges from 1 micron to 50 microns, inclusive.
Optionally, the optical waveguide substrate is a glass optical waveguide substrate or a resin optical waveguide substrate.
The present application further provides an AR wearable device, comprising any of the above optical waveguide structures.
The application provides an optical waveguide structure, includes: an optical waveguide substrate; the two-dimensional holographic grating is located on the lower surface of the optical waveguide substrate and formed by a photosensitive substrate, the two-dimensional holographic grating comprises a first refractive index area and a second refractive index area which are arranged according to a preset shape, and the refractive index of the first refractive index area is smaller than that of the second refractive index area.
Therefore, the optical waveguide structure comprises the optical waveguide substrate and the two-dimensional holographic grating, the two-dimensional holographic grating comprises the first refractive index area and the second refractive index area, the two-dimensional holographic grating is formed by the photosensitive substrate, and the price of the photosensitive substrate material is low, so that the price of the two-dimensional holographic grating is low, and the cost and the price of the optical waveguide structure are low. In addition, the application also provides an AR wearable device with the advantages.
Drawings
For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical waveguide structure according to an embodiment of the present disclosure;
FIG. 2 is a diagram of light diffraction transmission in a two-dimensional holographic grating;
in the figure, 1, an optical waveguide substrate, 2, a two-dimensional holographic grating, 3, an eye, 4, an incident beam, 5, a diffracted beam, 6, an outcoupled beam, 21, a first refractive index region, 22, a second refractive index region, 211, a first sub-region, 212, a second sub-region.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As described in the background section, the cost of surface relief gratings has led to a high price for surface relief grating optical waveguide structures.
In view of the above, the present application provides an optical waveguide structure, please refer to fig. 1 and fig. 2, in which fig. 1 is a schematic structural diagram of an optical waveguide structure provided in an embodiment of the present application, and fig. 2 is a schematic diagram of light diffraction transmission in a two-dimensional holographic grating, the optical waveguide structure includes:
an optical waveguide substrate 1;
the two-dimensional holographic grating 2 is formed by a photosensitive substrate and is positioned on the lower surface of the optical waveguide substrate 1, the two-dimensional holographic grating 2 comprises a first refractive index area 21 and a second refractive index area 22 which are arranged according to a preset shape, and the refractive index of the first refractive index area 21 is smaller than that of the second refractive index area 22.
Note that the refractive index in the two-dimensional hologram grating 2 varies in a periodic manner as a sin function as a whole, and the peak of the sin function corresponds to the second refractive index region 22 and the valley of the sin function corresponds to the first refractive index region 21. It is also noted that the refractive indices in the first and second refractive index regions 21 and 22 are not equal to a fixed value, and the refractive indices in the first and second refractive index regions 21 and 22 are graded in a sin function.
It should be noted that the optical waveguide substrate 1 is a flat plate with a flat surface, and the upper surface and the lower surface are parallel to each other, and further, the optical waveguide substrate 1 is not particularly limited in this embodiment, and may be determined as the case may be. For example, the optical waveguide substrate 1 is a substrate having high transparency and capable of transmitting a light beam including virtual image information, such as a glass optical waveguide substrate 1 or a resin optical waveguide substrate 1.
Generally, the thickness of the glass optical waveguide substrate 1 ranges from 0.8 mm to 3 mm, the haze value is below 0.1%, the transmittance of a visible light band is above 95%, and the refractive index ranges from 1.5 to 2.0.
When an incident beam enters the two-dimensional holographic grating 2 for diffraction, a diffracted beam is coupled into the optical waveguide substrate 1 and is totally reflected, the beam entering the two-dimensional holographic grating 2 again can continue to perform diffraction action with the two-dimensional holographic grating 2, the diffracted beam has a light splitting phenomenon, and the diffraction direction of the light splitting beam is shown in fig. 2. In the diffraction process of each light beam and the two-dimensional holographic grating 2, one coupled light beam is coupled out of the optical waveguide structure and is emitted to the space where the human eyes are located, and the coupled light beam is captured by the human eyes; the coupled-out light beams form a hexagonal distribution coupled-out light lattice as shown in fig. 2, thereby realizing a two-dimensional pupil expansion of the optical waveguide structure.
It should be noted that, in this embodiment, the material of the photosensitive substrate is not particularly limited, and may be set by itself. For example, the photosensitive substrate may be a silver salt photosensitive substrate, or a polypropylene photosensitive substrate, or a liquid crystal polymer photosensitive substrate, or the like.
The two-dimensional holographic grating 2 is prepared by subjecting a photosensitive substrate to holographic writing processes such as exposure, development, bleaching and the like. Specifically, the writing process includes two exposures, each exposure uses two parallel coherent light beams to write one set of one-dimensional holographic grating, the photosensitive substrate is rotated to a preset angle, another set of one-dimensional holographic grating is written again according to the same experimental parameters, the time for writing the exposure is between 0.1 second and 10 seconds, and the two-dimensional holographic grating 2 with the first refractive index area 21 and the second refractive index area 22 is obtained, wherein the preset angle is determined according to specific optical requirements. In addition, the cost of the machine used for exposure in the manufacturing process of the two-dimensional holographic grating 2 is low, so that the cost of the two-dimensional holographic grating 2 is low.
When the predetermined angle is an acute angle, that is, the first refractive index region 21 and the second refractive index region 22 are rhombus, a direction corresponding to the acute angle of the rhombus is an incident light direction. Wherein, the refractive index in the normal direction of the surface of the two-dimensional holographic grating 2 is not changed.
The optical waveguide structure provided by the embodiment comprises an optical waveguide substrate 1 and a two-dimensional holographic grating 2, wherein the two-dimensional holographic grating 2 comprises a first refractive index area 21 and a second refractive index area 22, the two-dimensional holographic grating 2 is formed by a photosensitive substrate, and the price of the two-dimensional holographic grating 2 is low due to the low price of the photosensitive substrate material, so that the cost of the optical waveguide structure is low, and the price is low.
Preferably, in one embodiment of the present application, the second refractive index region 22 in the two-dimensional holographic grating is a diamond shape, and the acute angle of the diamond shape is 60 degrees, so that the energy of the coupled-out light beam is uniformly distributed.
On the basis of any of the above embodiments, in an embodiment of the present application, the grating inclination angle of the two-dimensional holographic grating 2 ranges from 20 degrees to 90 degrees, inclusive, to increase the incident angle range of the incident light beam, and accordingly, both the diffraction angle range of the diffracted light beam and the range of the coupled-out light beam are increased. Preferably, the grating inclination angle of the two-dimensional holographic grating 2 is 90 degrees, i.e. the direction of the grating vector of the two-dimensional holographic grating 2 is perpendicular to the surface normal.
On the basis of any of the above embodiments, in an embodiment of the present application, a value of a grating period in the first refractive index region 21 of the two-dimensional holographic grating ranges from 200 nm to 700 nm, inclusive, so as to obtain a reasonable incident beam field angle range and diffraction efficiency response.
Specifically, the first refractive index region 21 includes a plurality of mutually parallel first sub-regions 211 and a plurality of mutually parallel second sub-regions 212, and the grating period is a distance between two adjacent first sub-regions 211, that is, a distance between two adjacent second sub-regions 212.
Preferably, in an embodiment of the present application, a thickness of the photosensitive substrate ranges from 1 micrometer to 50 micrometers, inclusive, that is, a thickness of the two-dimensional holographic grating 2 is also between 1 micrometer and 50 micrometers, so that the thickness of the optical waveguide structure can be significantly reduced, and the optical waveguide structure has a light and thin characteristic.
On the basis of any of the above embodiments, in an embodiment of the present application, a refractive index modulation degree of the second refractive index region 22 and the first refractive index region 21 of the two-dimensional holographic grating ranges from 0.001 to 0.3, inclusive, so as to regulate an energy distribution condition of a diffracted light beam.
Preferably, the refractive index modulation degree of the two-dimensional holographic grating 2 increases in order in a direction from a light incident end to a light output end of the two-dimensional holographic grating 2. Because the light transmission intensity in the optical waveguide structure weakens after the two-dimensional holographic grating 2 couples out the light, and then arouse the light beam to reduce gradually in the light transmission direction, consequently, on the light incident end of two-dimensional holographic grating 2 to the light output end direction, in the direction of keeping away from the light beam incident point promptly, also in the transmission direction of two-dimensional holographic grating 2 of light, the refracting index modulation degree of two-dimensional holographic grating 2 increases in proper order, with the diffraction efficiency of guaranteeing to couple out the diffracted beam a little bigger, make the whole diffraction energy of coupling out the light beam array more even.
The present application further provides an AR wearable device, comprising any of the above optical waveguide structures.
The wearable equipment of AR that this embodiment provided includes optical waveguide structure, because optical waveguide structure has characteristics thin, with low costs, so wearable equipment of AR has characteristics frivolous equally, and comfort when promoting the user and dressing is with low costs.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The optical waveguide structure and the AR wearable device provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. An optical waveguide structure, comprising:
an optical waveguide substrate;
the two-dimensional holographic grating is located on the lower surface of the optical waveguide substrate and formed by a photosensitive substrate, the two-dimensional holographic grating comprises a first refractive index area and a second refractive index area which are arranged according to a preset shape, and the refractive index of the first refractive index area is smaller than that of the second refractive index area.
2. The optical waveguide structure of claim 1 wherein the second refractive index region in the two-dimensional holographic grating is a diamond shape with an acute angle of the diamond shape being 60 degrees.
3. The optical waveguide structure of claim 1 wherein the grating slant angle of the two-dimensional holographic grating ranges from 20 degrees to 90 degrees, inclusive.
4. The optical waveguide structure of claim 1 wherein a grating period in the first refractive index region of the two-dimensional holographic grating ranges from 200 nanometers to 700 nanometers, inclusive.
5. The optical waveguide structure of claim 1 wherein the index modulation of the second index region and the first index region of the two-dimensional holographic grating ranges from 0.001 to 0.3, inclusive.
6. The optical waveguide structure of claim 5 wherein the degree of refractive index modulation of the two-dimensional holographic grating increases sequentially in a direction from a light incident end to a light output end of the two-dimensional holographic grating.
7. The optical waveguide structure of claim 1 wherein said photosensitive substrate is any one of a silver salt photosensitive substrate, a polypropylene photosensitive substrate, a liquid crystal polymer photosensitive substrate.
8. The optical waveguide structure of claim 1 wherein the thickness of the photosensitive substrate ranges from 1 micron to 50 microns, inclusive.
9. The optical waveguide structure according to any one of claims 1 to 8, wherein the optical waveguide substrate is a glass optical waveguide substrate or a resin optical waveguide substrate.
10. An AR wearable device, characterized in that it comprises an optical waveguide structure according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921777401.2U CN210348070U (en) | 2019-10-22 | 2019-10-22 | Optical waveguide structure and AR wearable equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921777401.2U CN210348070U (en) | 2019-10-22 | 2019-10-22 | Optical waveguide structure and AR wearable equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210348070U true CN210348070U (en) | 2020-04-17 |
Family
ID=70178874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921777401.2U Active CN210348070U (en) | 2019-10-22 | 2019-10-22 | Optical waveguide structure and AR wearable equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210348070U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113568167A (en) * | 2020-04-29 | 2021-10-29 | 宁波舜宇光电信息有限公司 | Lens unit and AR apparatus including the same |
| CN114280790A (en) * | 2021-12-29 | 2022-04-05 | 材料科学姑苏实验室 | Diffraction light waveguide device and near-to-eye display equipment |
-
2019
- 2019-10-22 CN CN201921777401.2U patent/CN210348070U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113568167A (en) * | 2020-04-29 | 2021-10-29 | 宁波舜宇光电信息有限公司 | Lens unit and AR apparatus including the same |
| CN114280790A (en) * | 2021-12-29 | 2022-04-05 | 材料科学姑苏实验室 | Diffraction light waveguide device and near-to-eye display equipment |
| CN114280790B (en) * | 2021-12-29 | 2024-03-26 | 材料科学姑苏实验室 | Diffraction optical waveguide device and near-to-eye display equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20240094545A1 (en) | Diffractive waveguide apparatus, near-eye display device, and manufacturing method for diffractive waveguide apparatus | |
| EP3787999B1 (en) | Diffraction gratings for beam redirection | |
| CN104423042B (en) | Optical device and image display device | |
| US7675680B2 (en) | Computer-generated hologram and its fabrication process, reflector using a computer-generated hologram, and reflective liquid crystal display | |
| US6608722B2 (en) | Directional diffuser | |
| CN111830715A (en) | Waveguide display device with two-dimensional extended pupil and augmented reality display equipment | |
| CN210348070U (en) | Optical waveguide structure and AR wearable equipment | |
| CN110651204A (en) | Diffraction grating with variable diffraction efficiency and method for displaying an image | |
| WO1997027519A9 (en) | Optical components containing complex diffraction gratings and methods for the fabrication thereof | |
| AU2010238336A1 (en) | Optical waveguide and display device | |
| CN113777787B (en) | Waveguide device with high efficiency and high uniformity | |
| CN111308598B (en) | Diffractive optical element, manufacturing method thereof and display device | |
| US11561393B2 (en) | Light guide plate and image display device | |
| JP2013205752A (en) | Light diffusion film, polarizing plate and liquid crystal display | |
| US20210356909A1 (en) | Systems, devices, and methods for side lobe control in holograms | |
| CN111175975B (en) | Near-to-eye display device for realizing large focal depth imaging | |
| JP4620220B2 (en) | Computer generated hologram and method for manufacturing the same | |
| JP2002040219A (en) | Computer hologram, reflection plate using computer hologram, reflection type liquid crystal display device using computer hologram | |
| CN215297729U (en) | Small-size near-to-eye waveguide display device | |
| CN114280791A (en) | Diffraction light waveguide device and preparation method thereof | |
| CN216526375U (en) | Apparatus for manufacturing integrated optical waveguide device | |
| Pappu | Holographic optical elements—State-of-the-art review: Part I | |
| KR20230064441A (en) | Atypical metasurface, method of designing the same, waveguide image combiner using the atypical Metasurface, and augmented reality device | |
| KR20230029278A (en) | Holographic optical element and manufacturing method thereof | |
| Gallego Sr et al. | Waveguide couplers based on HPDLC for see-through applications: initiator optimization |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |