Full-color AR glasses illumination architecture based on metasurface
By adopting metasurface devices and adjustable nanostructure design in AR glasses, the problems of large size and poor wearing comfort in existing AR glasses are solved, and smaller size and higher wearing comfort are achieved.
Patent Information
- Application Number
- CN202421104616.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-20
AI Technical Summary
Due to the complex three-color lighting system of the existing AR glasses, the size, fov and resolution are limited, and the wear comfort needs to be improved.
Adopt a full-color AR glasses lighting architecture based on metasurface, including metasurface devices and light sources. The metasurface devices are composed of substrates and nanostructures. The nanostructure layers are adjustable, and the light sources are red, green, and blue lasers/LEDs or white lights. , the metasurface device is placed inclined above the light source, and the three-color light sources of the light source are arranged in sequence from bottom to top. The angle between the emitted main light and the normal of the metasurface device is adjustable. The size and number of layers of the nanostructure are between 100nm-500nm and Between 1-3 floors.
The number of devices in the lighting path is reduced, the volume is reduced, the wear comfort of AR glasses is improved, and the flexibility of structural arrangement is improved.
Smart Images
Figure CN222213078U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the field of AR glasses, and in particular to a full-color AR glasses lighting architecture based on a metasurface. Background Art
[0002] With the rapid development of science and technology, the display mode has undergone earth-shaking changes. Traditional two-dimensional display can no longer meet human needs. Three-dimensional display has become the focus of academic and industrial circles. AR display is a mainstream three-dimensional imaging method. The main problems at present are small eye movement range, limited FOV and resolution, and the wearing comfort needs to be improved due to volume restrictions. The main reason for the large volume is that the complex beam path of the three-color lighting system will inevitably increase the weight and volume, reducing the wearing comfort. Utility Model Content
[0003] The present application provides a full-color AR glasses lighting architecture based on a metasurface to at least solve the above technical problems existing in the prior art.
[0004] An embodiment of the present application provides a full-color AR glasses lighting architecture based on a metasurface, including a metasurface device and a light source, wherein the metasurface device is arranged above the light source and is arranged at an angle, the light source includes light of at least three colors, and the metasurface device is composed of a substrate and a nanostructure attached to the substrate, and the nanostructure has at least one layer.
[0005] In one possible implementation manner, the light source is a red, green, and blue laser / LED, and the metasurface device is tilted on the right side of the light source, and the tilt angle is adjustable.
[0006] In one possible implementation, the three-color light sources are arranged in sequence from bottom to top, namely a blue light source, a green light source, and a red light source.
[0007] In one possible implementation, the blue light source emits divergent light with a wavelength of 430-480 nm, the green light source emits divergent light with a wavelength of 492-577 nm, and the red light source emits light with a wavelength of 600 nm.
[0008] In one possible implementation, the blue light source emits divergent light with a wavelength of 443 nm, the green light source emits divergent light with a wavelength of 570 nm, and the red light source emits divergent light with a wavelength of 632 nm.
[0009] In one possible implementation, the angles between the main light rays emitted by the red light source, the green light source, and the blue light source and the normal of the metasurface device increase successively.
[0010] In one possible implementation, the light source is a white light source.
[0011] In one possible implementation, the spectrum range of the white light source is 430-720 nm.
[0012] In one possible implementation, the angle between the main light ray emitted by the white light source and the normal of the metasurface device is 30°.
[0013] In one possible implementation manner, the number of layers of the nanostructure is 1-3, the size of the nanostructure is between 100 nm and 500 nm, and the morphology is adjustable.
[0014] Compared with the prior art, this application has the following advantages:
[0015] 1. This application adopts metasurface devices to realize the design of the illumination light path in the AR display system, which can reduce the number of devices in the illumination light path, reduce the volume, and improve the wearing comfort of AR glasses;
[0016] 2. The illumination light path in this application breaks the traditional pattern of arranging multiple light sources and prisms vertically or at 45 degrees, thus improving the flexibility of structural arrangement. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of the full-color AR glasses lighting architecture in Example 1 of the present application;
[0018] Figure 2 is a schematic structural diagram of the super surface device in Example 1 of the present application;
[0019] Figure 3 It is a schematic diagram of the structure of the full-color AR glasses lighting architecture in Example 2 of the present application;
[0020] Figure 4 is a schematic diagram of the structure of the super surface device in Example 2 of the present application;
[0021] Description of reference numerals:
[0022] 11. Blue light source; 12. Green light source; 13. Red light source; 14. Metasurface device; 15. Parallel light; 31. Substrate; 32. Nanostructure; 33. Protective layer;
[0023] 21. White light source; 22. Metasurface device; 23. Illumination light; 24. Direct light; 25. Absorption layer; 41. Substrate; 42. Nanostructure; 43. Protective layer; DETAILED DESCRIPTION
[0024] The present application is further described in detail below in conjunction with the accompanying drawings.
[0025] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0026] In this application, the full-color AR glasses lighting architecture includes a light source and a metasurface device. The metasurface device is arranged above the light source and is tilted. The light source includes at least three colors of light, and red, green, and blue lasers / LEDs or white light sources can be selected. The metasurface device consists of a substrate and a nanostructure attached to the substrate, and the number of layers of the nanostructure is at least one layer. Specifically, the number of layers of the nanostructure can be adjusted between 1 and 3 layers according to actual needs. The size of the nanostructure is adjustable between 100nm and 500nm.
[0027] Example 1
[0028] refer to Figure 1 The full-color AR glasses lighting architecture includes a three-color light source and a metasurface device 14. The three-color light source can emit parallel light 15 after being modulated by the metasurface device 14. The three-color light source can be red, green, and blue lasers / LEDs. The three-color light sources are arranged from bottom to top, namely a blue light source 11, a green light source 12, and a red light source 13. The blue light source emits divergent light with a wavelength of 430-480nm, the green light source emits divergent light with a wavelength of 492-577nm, and the red light source emits light with a wavelength of 600nm.
[0029] The optical powers of the blue light source 11, the green light source 12 and the red light source 13 are not equal, and the appropriate optical power needs to be adjusted according to the principle of colorimetry to ensure the display effect. The metasurface device 14 plays a role in adjusting the propagation direction of light, and is tilted to the right of the blue light source 11, the green light source 12 and the red light source 13, and the tilt angle is adjustable.
[0030] The angles between the main light rays emitted by the red light source 13, the green light source 12, and the blue light source 11 and the normal of the metasurface device 14 increase in sequence. Specifically, the blue light source 11 is placed at the bottom, and the angle between the main light rays emitted by the blue light source 12 and the normal of the metasurface device 14 is the smallest. The green light source 12 is placed above the blue light source 11, and the angle between the main light rays emitted by the green light source 12 and the normal of the metasurface device 14 is greater than the angle between the main light rays emitted by the blue light source 11 and the normal of the metasurface device 14. The red light source 13 is placed above the green light source 12, and the angle between the main light rays emitted by the red light source 13 and the normal of the metasurface device 14 is greater than the angle between the main light rays emitted by the green light source 12 and the normal of the metasurface device 14.
[0031] refer to Figure 2 The metasurface device 14 includes a substrate 31 and a nanostructure 32. The substrate 31 is arranged on a side away from the incident light, and the nanostructure 32 is arranged on a side facing the incident light. Optionally, the substrate thickness is 0.5 mm, the nanostructure 32 is a single layer, and the nanocolumn period is between 100 nm and 500 nm. The height is in the range of 500 nm to 1500 nm. A protective layer 33 is also provided on the outside of the nanostructure 32, and the protective layer 33 is used to protect the nanostructure 32 from being damaged during use.
[0032] Specifically, a laser diode with good monochromaticity is selected as the light source. The wavelength of the blue light source 11 is 443nm, and the bandwidth is within 20nm. The angle between its main light and the normal of the metasurface 14 is 30 degrees. The wavelength of the green light source 12 is 570nm, and the bandwidth is within 20nm. The angle between its main light and the normal of the metasurface 14 is 45 degrees. The wavelength of the red light source 13 is 632nm, and the bandwidth is within 20nm. The angle between its main light and the normal of the metasurface 14 is 60 degrees.
[0033] The metasurface device 14 is placed at an angle of 30 degrees, with the substrate 31 facing upward and the nanostructure 32 facing downward, to receive incident light of three wavelengths. The phase arrangement formula of the metasurface is as follows:
[0034]
[0035] in Represents the phase response value of the metasurface at different positions at a specific wavelength. λ represents the wavelength. Z represents the distance from the light-emitting hole of each light source to the plane where the metasurface is located. Δx and Δy represent the horizontal and vertical distances of the projection point of the light-emitting hole of the light source on the plane where the metasurface is located from the optical axis of the metasurface.
[0036] With (x i ,y i ) as an example, its phase value must satisfy:
[0037]
[0038] in represents the phase at a specified wavelength, λ represents the wavelength, and xi and yi represent the position coordinates of the device surface.
[0039] Therefore, the selection of nanopillars needs to be determined by scanning. After being modulated by the metasurface, the three laser beams are combined into a beam of parallel light 15 and propagated to the right to improve the illumination for the subsequent system.
[0040] Example 2
[0041] refer to Figure 3The full-color AR glasses lighting architecture includes a white light source 21 and a metasurface device 22. The white light source 21 emits a wide spectrum of divergent light, and the spectrum range at least covers the visible light range of 430nm-720nm. The main light beam emitted by the white light source 21 and the normal of the metasurface device 22 are at an angle of 30° (the angle can be adjusted as needed).
[0042] refer to Figure 4 The metasurface device 22 includes a substrate 41 and at least one layer of nanostructure 42. A protective layer 43 is also provided on the outside of the nanostructure 42, and the protective layer 43 is used to protect the nanostructure 42 from being damaged during use. The substrate 41 is arranged on the side away from the incident light, and the nanostructure 42 is arranged on the side facing the incident light. The metasurface device 22 is located above the white light source 21, and deflects the light with a bandwidth of 10nm near 443nm, 570nm, and 632nm in the incident light, and transmits it to the right in the form of nearly parallel light to form illumination light 23. Light in other bands continues to propagate forward after passing through the metasurface device 22 to form straight light 24. Since this part of the light is not used for illumination, it will be absorbed by the absorption layer 25.
[0043] When the nanostructure 42 is multi-layered, the substrate 41 is provided with multiple layers of nanostructures 42. A protective layer 43 is provided on the outer side of each layer of the nanostructure 42. Figure 4 The nanostructure 42 has three layers, and a protective layer 43 is disposed on the outer side of each layer of the nanostructure 42 .
[0044] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A full-color AR glasses lighting architecture based on a metasurface, characterized by: It includes a metasurface device and a light source, wherein the metasurface device is arranged above the light source and is inclined, the light source includes light of at least three colors, and the metasurface device is composed of a substrate and a nanostructure attached to the substrate, and the nanostructure has at least one layer.
2. A full-color AR glasses lighting architecture based on a metasurface according to claim 1, characterized in that: The light source is red, green and blue laser / LED, and the metasurface device is tiltedly placed on the right side of the light source, and the tilt angle is adjustable.
3. The full-color AR glasses lighting architecture based on a metasurface according to claim 2, characterized in that: The three-color light sources are arranged from bottom to top, namely blue light source, green light source and red light source.
4. The full-color AR glasses lighting architecture based on a metasurface according to claim 3, characterized in that: The blue light source emits divergent light with a wavelength of 430-480 nm, the green light source emits divergent light with a wavelength of 492-577 nm, and the red light source emits light with a wavelength of 600 nm.
5. The full-color AR glasses lighting architecture based on a metasurface according to claim 4, characterized in that: The blue light source emits divergent light with a wavelength of 443 nm, the green light source emits divergent light with a wavelength of 570 nm, and the red light source emits light with a wavelength of 632 nm.
6. The full-color AR glasses lighting architecture based on a metasurface according to claim 3, characterized in that: The angles between the main light rays emitted by the red light source, the green light source, and the blue light source and the normal line of the metasurface device increase successively.
7. The full-color AR glasses lighting architecture based on a metasurface according to claim 1, characterized in that: The light source is a white light source.
8. The full-color AR glasses lighting architecture based on a metasurface according to claim 7, characterized in that: The spectrum range of the white light source is 430-720nm.
9. The full-color AR glasses lighting architecture based on a metasurface according to claim 8, characterized in that: The angle between the main light ray emitted by the white light source and the normal line of the metasurface device is 30°.
10. The full-color AR glasses lighting architecture based on a metasurface according to claim 1, characterized in that: The number of layers of the nanostructure is 1-3, the size of the nanostructure is between 100nm and 500nm, and the shape is adjustable.