Near-to-eye display system and ar glasses

Abstract

A near-to-eye display system (1) and AR glasses (3). The near-to-eye display system (1) comprises an optical waveguide module (10), an optical engine module (20) and a metalens assembly (22). A first in-coupling grating region (111) and a first out-coupling grating region (112) are formed in the optical waveguide module (10). The optical engine module (20) comprises a light source assembly (21), which is arranged opposite the first in-coupling grating region (111), and the metalens assembly (22), which is arranged between the light source assembly (21) and the optical waveguide module (10), wherein the light source assembly (21) is used for outputting image optical signals to the metalens assembly (22), the image optical signals comprising at least two types of optical signals of different attributes, and the attributes comprising at least one of a wavelength, an emission angle and an emission position. The metalens assembly (22) comprises a substrate (221) and a metasurface structure (222) on the substrate (221), wherein the metasurface structure (222) is configured to receive the image optical signals and diffract the optical signals to the first in-coupling grating region (111). The optical signals which have the same emission position have the same diffraction angle. Thus, the volume and weight of a lens of the optical engine module (20) are reduced, and the design requirements for high image quality and a large field of view are also met.

Description

Near-eye display system and AR glasses Technical Field

[0001] The present application relates to the field of near-eye display devices, and in particular to a near-eye display system and AR glasses. Background Art

[0002] With advancements in optical display technology, a new generation of near-eye display devices, such as AR (Augmented Reality) devices and glasses, are emerging. These devices project virtual images into the human eye, allowing users to simultaneously receive information from both the real and virtual worlds.

[0003] Currently, most AR devices on the market use traditional lens group solutions for their optical module lenses. Due to the large number of lenses in traditional lens groups, there are problems with the lenses being large in size and heavy in weight, making it difficult for AR devices to simultaneously meet the design requirements of lightweight, high image quality, and a large field of view.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a near-eye display system and AR glasses, which aim to reduce the volume and weight of the lens in the near-eye display system, thereby reducing the size and weight of the optical module, while meeting the design requirements of high image quality and a large field of view.

[0006] In a first aspect, an embodiment of the present application provides a near-eye display system, the near-eye display system comprising:

[0007] An optical waveguide module is formed with a first coupling-in grating region and a first coupling-out grating region, the optical waveguide module is used to receive an optical signal through the first coupling-in grating region, transmit the received optical signal to the first coupling-out grating region, and emit the optical signal from the first coupling-out grating region;

[0008] An optical machine module, comprising a light source assembly disposed relative to the first coupling-in grating region and a metalens assembly disposed between the light source assembly and the optical waveguide module, wherein the light source assembly is configured to output an image light signal to the metalens assembly, wherein the image light signal comprises at least two types of light signals having different properties, wherein the properties of the light signals comprise at least one of wavelength, emission angle, and emission position;

[0009] The metalens assembly includes at least a substrate and a metasurface structure disposed on the substrate, and the metasurface structure is configured to receive an image light signal and diffract each light signal of the image light signal to a first coupling-in grating region, wherein light signals with the same exit position have the same diffraction angle.

[0010] In some embodiments, the near-eye display system has an exit pupil position, and the exit pupil position is opposite to the first coupling grating region, and the metasurface structure is configured to diffract the light signal through the exit pupil position to the first coupling grating region.

[0011] In some embodiments, the metasurface structure includes a plurality of metasurface unit groups, and the plurality of metasurface unit groups are periodically arranged from the center of the substrate toward the outside.

[0012] In some embodiments, the metasurface unit group includes a plurality of metasurface units arranged in a ring along the center of the substrate.

[0013] In some embodiments, the metasurface unit includes at least one nanopillar protruding from the substrate on a side facing the light source assembly or a side facing the optical waveguide module, and the nanopillars on the substrate are protruded in the same direction;

[0014] The nanorods are used to diffract light signals incident on the nanorods to the first coupling-in grating region.

[0015] In some embodiments, the height H of the nanorods in the first direction satisfies: H>λ0 / (n1-n2)

[0016] Wherein, λ0 is the wavelength of the light signal incident on the nanorod, n1 is the refractive index of the nanorod material, n2 is the refractive index of air, and the first direction is perpendicular to the extension direction of the substrate.

[0017] In some embodiments, the diameter D and height H of the nanorods satisfy: D>60nm, 300nm <H<3um、H / D<20。

[0018] In some embodiments, the metasurface unit is rectangular, and the length and width of the metasurface unit are both greater than 100 nm and less than 3000 nm.

[0019] In some embodiments, the image light signal includes a first type of light signal and a second type of light signal, and the wavelengths of the first type of light signal and the second type of light signal are different;

[0020] The optical waveguide module comprises at least a first waveguide plate and a second waveguide plate disposed on a side of the first waveguide plate away from the metalens assembly, wherein a first in-coupling grating region and a first out-coupling grating region are disposed on the first waveguide plate, and a second in-coupling grating region and a second out-coupling grating region are disposed on the second waveguide plate;

[0021] The first waveguide is configured to transmit a first type of optical signal incident on the first coupling-in grating region to the first coupling-out grating region, and diffract a second type of optical signal incident on the first coupling-in grating region to the second coupling-in grating region;

[0022] The second waveguide plate is configured to transmit the second type of optical signal incident to the second coupling-in grating region to the second coupling-out grating region, and diffract it from the second coupling-out grating region to the first coupling-out grating region, so that the first type of optical signal and the second type of optical signal converge in the first coupling-out grating region.

[0023] In some embodiments, the first coupling-in grating region and the second coupling-in grating region are disposed opposite to each other in the thickness direction of the optical waveguide module, and the first coupling-out grating region and the second coupling-out grating region are disposed opposite to each other in the thickness direction of the optical waveguide module.

[0024] In some embodiments, the superlens assembly includes at least one superlens lens, wherein each superlens lens includes a substrate and a corresponding supersurface structure, and at least one superlens lens is discretely arranged between the light source assembly and the optical waveguide module.

[0025] In some embodiments, the near-eye display system further includes at least one unit lens lens, including but not limited to a convex lens lens or a concave lens lens:

[0026] Wherein, at least one unit lens and at least one super lens are separately arranged between the light source component and the optical waveguide module.

[0027] On the second aspect, the embodiments of the present application further provide an AR glasses, which include a frame module and any one of the near-eye display systems provided in the embodiments of the present application, and the near-eye display system is installed in the frame module.

[0028] In some embodiments, the frame module includes a frame assembly and a temple assembly connected to the frame assembly;

[0029] Among them, the optical waveguide module in the near-eye display system is installed on the frame assembly, and the optical machine module in the near-eye display system is arranged on the side of the frame assembly close to the temple assembly and corresponding to the first coupling grating area of ​​the optical waveguide module.

[0030] In some embodiments, the near-eye display system further includes a near-eye lens module, which is mounted on the frame assembly and disposed corresponding to the first outcoupling grating region of the optical waveguide module.

[0031] In some embodiments, the near-eye lens module includes one of a dioptric lens and a plano lens.

[0032] In summary, the embodiments of the present application provide a near-eye display system and AR glasses, wherein the near-eye display system includes: an optical waveguide module, which is formed with a first coupling-in grating region and a first coupling-out grating region, the optical waveguide module is used to receive an optical signal through the first coupling-in grating region, transmit the received optical signal to the first coupling-out grating region, and emit an optical signal from the first coupling-out grating region; an optical machine module, the optical machine module includes a light source component arranged relative to the first coupling-in grating region and a super lens component arranged between the light source component and the optical waveguide module, the light source component is used to output an image light signal to the super lens component, the image light signal includes at least two types of light signals with different properties, and the properties of the light signal include at least one of wavelength, exit angle and exit position; the super lens component includes at least a substrate and a super surface structure arranged on the substrate, and the super surface structure is configured to receive the image light signal and diffract each light signal of the image light signal to the first coupling-in grating region, wherein light signals with the same exit position have the same diffraction angle. Therefore, the near-eye display system and AR glasses provided by the embodiments of the present application reduce the volume and weight of the lens through the setting of the super lens component, thereby reducing the size and weight of the optical machine module, and at the same time meeting the design requirements of high image quality and large field of view. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] FIG1 is a schematic diagram of a module of a near-eye display system according to an embodiment of the present application;

[0035] FIG2 is a schematic structural diagram of an implementation of a near-eye display system provided in an embodiment of the present application;

[0036] FIG3 is a schematic structural diagram of a metalens module in a near-eye display system provided in one embodiment of the present application;

[0037] FIG4 is a schematic structural diagram of another implementation of a near-eye display system provided in one embodiment of the present application;

[0038] FIG5 is another structural diagram of a metalens module in a near-eye display system provided by an embodiment of the present application;

[0039] FIG6 is a schematic diagram of the structure of nanopillars in a near-eye display system according to an embodiment of the present application;

[0040] FIG7 is an enlarged schematic diagram of the surface structure of a metalens module in a near-eye display system provided in one embodiment of the present application;

[0041] FIG8 is a schematic structural diagram of another embodiment of a near-eye display system provided in an embodiment of the present application;

[0042] FIG9 is a schematic diagram of an optical path structure of an embodiment of a near-eye display system provided in an embodiment of the present application;

[0043] FIG10 is a schematic diagram of an optical path structure of an embodiment of a near-eye display system provided in an embodiment of the present application;

[0044] FIG11 is a schematic diagram of modules of an implementation of AR glasses provided in one embodiment of the present application;

[0045] FIG12 is a schematic structural diagram of an implementation of AR glasses provided in an embodiment of the present application.

[0046] Figure numerals: 1. near-eye display system; 10. optical waveguide module; 11. first waveguide plate; 111. first coupling-in grating region; 112. first coupling-out grating region; 121. second coupling-in grating region; 122. second coupling-out grating region; 20. optical machine module; 21. light source assembly; 22. super lens assembly; 221. substrate; 222. super surface structure; 2221; super surface unit group; 2222. super surface unit; 2223. nano column; 23. super lens lens; 24. unit lens lens; 30. exit pupil position; 2. frame module; 21. frame assembly; 22. temple assembly; 3. AR glasses; 4. near-eye lens module. DETAILED DESCRIPTION

[0047] The technical solutions of the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. It is obvious that the embodiments described are some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The flowcharts shown in the drawings are only examples and do not necessarily include all the contents and operations / steps, nor do they have to be performed in the order described. For example, some operations / steps can also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions. The above is only a specific embodiment of the present application, but the scope of protection of the present application is not limited to this. Any technician familiar with this technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in this application, and these modifications or replacements should be included in the scope of protection of this application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0048] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. The following embodiments and features in the embodiments may be combined with each other unless there is any conflict.

[0049] Please refer to Figures 1 to 3. Figure 1 is a module schematic diagram of an implementation of a near-eye display system provided in an embodiment of the present application. Figure 2 is a structural schematic diagram of an implementation of a near-eye display system provided in an embodiment of the present application. Figure 3 is a structural schematic diagram of a super lens module in the near-eye display system provided in an embodiment of the present application.

[0050] As shown in FIG. 1 to FIG. 3 , an embodiment of the present application provides a near-eye display system 1 , including: an optical waveguide module 10 and an optical machine module 20 . The structures of each part of the near-eye display system 11 are described in detail below.

[0051] Specifically, the optical waveguide module 10 is formed with a first coupling-in grating region 111 and a first coupling-out grating region 112. The optical waveguide module 10 is configured to receive an optical signal through the first coupling-in grating region 111, transmit the received optical signal to the first coupling-out grating region 112, and emit the optical signal from the first coupling-out grating region 112. The first coupling-in grating region 111 and the first coupling-out grating region 112 can be disposed on the same side of the optical waveguide module 10 or on opposite sides of the optical waveguide module 10.

[0052] Specifically, the optical machine module 20 includes a light source component 21 arranged relative to the first coupling grating area 111 and a super lens component 22 arranged between the light source component 21 and the optical waveguide module 10. The light source component 21 is used to output an image light signal to the super lens component 22. The image light signal includes at least two types of light signals with different properties. The properties of the light signal include at least one of the wavelength, the output angle and the output position.

[0053] As shown in FIG2 , it should be noted that the image light signal includes light signals with different properties. The light signals with different properties may have different emission angles, or different emission positions, or different wavelengths of the light signals, such as RGB light (i.e., red, green, and blue primary colors) with different wavelength ranges. The light source assembly 21 has a light output port, and the light source assembly 21 is used to emit the image light signal from the light output port. The emission angle of the light signal refers to the angle at which the light signal is emitted from the light output port, and the emission position of the light signal refers to the position at which the light signal is emitted from the light output port.

[0054] Specifically, the superlens assembly 22 includes at least a substrate 221 and a supersurface structure 222 arranged on the substrate 221, wherein the substrate 221 is light-transmissive, and the supersurface structure 222 is configured to receive image light signals and diffract each light signal of the image light signal to the first coupling grating area 111, and light signals with the same output position have the same diffraction angle.

[0055] As shown in FIG2 , it should be understood that, for the optical signals in the image optical signal, if the emission positions of the two optical signals on the light source component 21 are the same, even if the wavelengths and / or emission angles of the two optical signals are different, the optical signal of the metasurface structure 222 on the superlens component 22 will still emit the two optical signals at the same diffraction angle, that is, the optical paths of the two optical signals emitted through the superlens component 22 are parallel to each other.

[0056] It should be noted that the features such as “same diffraction angle”, “parallel optical paths”, and “parallel to each other” described in the embodiments of the present application are intended to indicate that the two light signals with the same exit position on the light source assembly 21 have the same exit direction after passing through the metalens assembly 22. However, in the actual near-eye display system 1, due to the errors of the optical product itself, the diffraction angles of the two light signals with the same exit position on the light source assembly 21 may have certain deviations. It should be understood that, taking into account this deviation in diffraction angle, the two light signals with the same exit position on the light source assembly 21 may not be absolutely parallel after passing through the metalens assembly 22, but may be approximately parallel. This situation also falls within the scope to be protected by the present application.

[0057] Based on this, in some embodiments, if the two light signals have the same emission position on the light source assembly 21 , the diffraction angles obtained by the two light signals after passing through the super lens assembly 22 have an error range of ±3 degrees.

[0058] It should be noted that in the near-eye display system 1 provided in the present application, the propagation path of the image light signal output by the light source component 21 is specifically as follows: starting from the light source component 21, first reaching the metalens component 22, then diffracted by the metasurface structure 222 on the metalens component 22 to the first coupling-in grating region 111 of the optical waveguide module 10, then transmitted by the optical waveguide module 10 to the first coupling-out grating region 112, and emitted from the first coupling-out grating region 112 to the eyeball of the target object for imaging. The target object refers to the object using the present near-eye display system 1. For example, when the near-eye display system 1 is mounted on AR glasses 3, the target object refers to the wearer of the AR glasses 3.

[0059] Compared with the bulky lens group design in the optical machine of traditional near-eye display products, the near-eye display system 1 provided in the embodiment of the present application is provided with a super lens assembly 22 to replace the function of the lens group (for example, including multiple concave lenses, convex lenses, etc.) in traditional near-eye display products, and reduce the volume and weight of the lens in the near-eye display system 1, thereby reducing the size and weight of the optical machine module 20, and at the same time meeting the design requirements of high image quality and large field of view.

[0060] Please refer to FIG4 , which is a schematic structural diagram of another implementation of a near-eye display system provided in an embodiment of the present application.

[0061] As shown in Figures 2 and 4 , with respect to the metalens assembly 22, it should be noted that the metasurface structure 222 can be disposed on the side of the substrate 221 close to the light source assembly 21, as shown in Figure 2 , or on the side of the substrate 221 close to the optical waveguide module 10, as shown in Figure 4 . Both of the above configurations can similarly receive image light signals and diffract each of the image light signals to the first coupling-in grating region 111, so that light signals at the same exit position have the same diffraction angle.

[0062] As shown in Figures 2 and 4, in some embodiments, the near-eye display system 1 has an exit pupil position 30, and the exit pupil position 30 is opposite to the first coupling grating area 111, and the metasurface structure 222 is configured to diffract the light signal through the exit pupil position 30 to the first coupling grating area 111.

[0063] Specifically, the near-eye display system 1 provided in the present application has an exit pupil position 30, and the exit pupil position 30 is located between the super lens assembly 22 and the first coupling grating area 111, and is opposite to the first coupling grating area 111. The light signal diffracted by the metasurface structure 222 reaches the first coupling grating area 111 through the exit pupil position 30.

[0064] Please refer to FIG. 5 , which is another structural diagram of a metalens module in a near-eye display system provided in one embodiment of the present application.

[0065] As shown in FIG. 3 and FIG. 5 , in some embodiments, the metasurface structure 222 includes a plurality of metasurface unit groups 2221 , and the plurality of metasurface unit groups 2221 are periodically arranged from the center of the substrate 221 toward the outside.

[0066] Specifically, the center of the substrate 221 refers to the center of the substrate 221 in the direction of its two-dimensional plane extension, and the metasurface structure 222 on the substrate 221 can be divided into multiple metasurface unit groups 2221. The area corresponding to a single metasurface unit group 2221 can be a ring, a regular quadrilateral, a regular hexagon, or a fan-shaped area around the center of the substrate 221. The distance between any two adjacent metasurface unit groups 2221 in the radial direction of the center of the substrate 221 is fixed, so that the multiple metasurface unit groups 2221 form a periodic arrangement outward from the center of the substrate 221. For example, when the area corresponding to a single metasurface unit group 2221 is ring-shaped around the center of the substrate 221, the radius of the multiple metasurface unit groups 2221 relative to the center of the substrate 221 increases sequentially.

[0067] As shown in FIG. 5 , in some embodiments, the metasurface unit group 2221 includes a plurality of metasurface units 2222 arranged in a ring shape along the center of the substrate 221 .

[0068] Specifically, the area corresponding to a single supersurface unit group 2221 is annular around the center of the substrate 221, then the supersurface unit group 2221 includes multiple supersurface units 2222 arranged in a ring along the center of the substrate 221, and the multiple supersurface units 2222 in the supersurface unit group 2221 are evenly arranged.

[0069] Please refer to FIG. 6 , which is a schematic diagram of the structure of nanorods in a near-eye display system provided by an embodiment of the present application.

[0070] As shown in Figure 6, in some embodiments, the metasurface unit 2222 includes at least one nanopillar 2223 protruding from the substrate 221 toward the side of the light source assembly 21 or toward the side of the optical waveguide module 10, and the nanopillars 2223 on the substrate 221 are protruded in the same direction, wherein the nanopillar 2223 is used to diffract the light signal incident on the nanopillar 2223 to the first coupling grating region 111.

[0071] Specifically, the metasurface units 2222 refer to nanopillars 2223 disposed on the surface of the substrate 221. It should be understood that in the embodiment of the present application, the nanopillars 2223 refer to columnar protrusions with a size of nanometers. These nanopillars 2223 extend and protrude from the substrate 221 toward the side facing the light source assembly 21 or toward the side facing the optical waveguide module 10. Moreover, the nanopillars 2223 of all the metasurface units 2222 on the substrate 221 are uniformly protruded toward the side facing the light source assembly 21 or toward the side facing the optical waveguide module 10.

[0072] It should also be noted that the nanorods 2223 are used to diffract the light signals incident on the nanorods 2223 to the first coupling grating area 111, and each nanorod 2223 on the substrate 221 is configured to perform corresponding phase compensation on the light signals with different properties, and emit light signals with the same output position (the output angle and wavelength are not necessarily the same) at the same diffraction angle, so as to replace the role of the lens group in the traditional near-eye display product, and reduce the volume and weight of the lens in the near-eye display system 1, thereby reducing the size and weight of the optical machine module 20, and at the same time meeting the design requirements of high image quality and large field of view.

[0073] As shown in FIG6 , in some embodiments, the height H of the nanorods 2223 in the first direction satisfies: H>λ0 / (n1-n2)

[0074] Wherein, λ0 is the wavelength of the light signal incident on the nanorod 2223 , n1 is the refractive index of the material of the nanorod 2223 , and n2 is the refractive index of air. For example, when the nanorod 2223 is made of silicon, n1 is the refractive index of the corresponding material.

[0075] It should be noted that the first direction is perpendicular to the two-dimensional plane extension direction of the substrate 221 , that is, the normal direction of the substrate 221 .

[0076] It should also be noted that the material of the substrate 221 includes but is not limited to materials such as fused quartz, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon. The material of the nanostructure may be the same as or different from the material of the planar substrate 221. As an example, the material of the nanostructure includes silicon oxide, silicon nitride, aluminum oxide, gallium nitride, titanium oxide, and amorphous silicon, etc.

[0077] In some embodiments, the diameter D and height H of the nanocolumns 2223 satisfy: D > 60 nm, 300 nm < H < 3 μm, and H / D < 20. It should be noted that in this embodiment, the nanocolumns 2223 are cylindrical protrusions.

[0078] As shown in FIG. 6, in some other embodiments, the nanocolumns 2223 are cubic-columnar protrusions. The size L of the nanocolumns 2223 includes the length and width of the cross-section of the nanocolumns 2223, and both the length and width satisfy the limitation of being greater than 60 nm. The height of the nanocolumns 2223 satisfies the limitation of being greater than 300 nm and less than 3 μm, and the ratio of the height of the nanocolumns 2223 to the size L (length and width) of the nanocolumns 2223 is less than 20.

[0079] By numerically limiting the size L and height H of the nanocolumns 2223, while ensuring the optical performance of the meta-lens assembly 22, the mechanical forming performance of the meta-lens assembly 22 is maintained, and the risk of damage or deformation of the meta-lens assembly 22 is reduced.

[0080] In some embodiments, the meta-surface unit 2222 is rectangular, and the size P of the meta-surface unit 2222: includes both the length and width greater than 100 nm and less than 3000 nm.

[0081] Specifically, restricting the shape and the range of the size P of a single meta-surface unit 2222 is beneficial to controlling the density of the meta-surface units 2222 on the substrate 221 and ensuring that the adjacent meta-surface units 2222 are arranged evenly.

[0082] In some embodiments, when setting the parameters of the size L and height H of the nanocolumns 2223 and the size P of the meta-surface unit 2222, the parameters are made to meet the following requirements: <​​​​Wherein, λ0 is the wavelength of the light signal incident on the nanorod 2223 , n1 is the refractive index of the material of the nanorod 2223 , and n2 is the refractive index of air. For example, when the nanorod 2223 is made of silicon, n1 is the refractive index of the corresponding material.

[0085] After selecting the height H of the nanopillar 2223 and the size P of the metasurface unit 2222, the size L of the nanopillar 2223 is changed so that the transmission amplitude T of the nanopillar 2223 approaches 1 and the transmission phase φ of the nanopillar 2223 covers (0, 2π). On this basis, the transmission amplitude T and phase are simulated and calculated, and the calculation form of the quality factor FOM is defined as:

[0086] Afterwards, the size L of the nanorods 2223 is adjusted to achieve the minimum value of the quality factor FOM, at which point the target size parameters can be obtained.

[0087] The parameters of the size L and height H of the nanorods 2223 and the size P of the metasurface unit 2222 are set by the above method to ensure a small size and good optical performance of the metalens assembly 22.

[0088] As shown in Figure 2, in some embodiments, the optical waveguide module 10 is configured as a single-layer waveguide lens, and the first coupling-in grating region 111 and the first coupling-out grating region 112 are both arranged on the single-layer waveguide lens. The single-layer waveguide lens is used to receive the optical signal through the first coupling-in grating region 111, transmit the received optical signal to the first coupling-out grating region 112, and emit the optical signal from the first coupling-out grating region 112.

[0089] Please refer to Figure 7, which is an enlarged schematic diagram of the surface structure of a metalens module in a near-eye display system provided in one embodiment of the present application. Specifically, Figures 7(a), 7(b), and 7(c) are schematic diagrams of the surface structure of the metalens module at different magnification scales, with Figure 7(c) showing the largest magnification scale and Figure 7(a) showing the smallest magnification scale.

[0090] As shown in Figures 5 and 7(a)(b)(c), the supersurface structure 222 includes a plurality of supersurface units 2222 arranged in a ring shape along the center of the substrate 221, and each supersurface unit 2222 includes a preset number of nanopillars 2223 (such as 1 or 2).

[0091] It should be noted that, comparing Figure 5 with Figure 7(a)(b)(c), Figure 5 only shows a portion of the supersurface units 2222 and nanopillars 2223, which are used to illustrate the positional relationship and inclusion relationship among the substrate 221, the supersurface unit group 2221, the supersurface units 2222 and the nanopillars 2223, and does not constitute a specific limitation on the number of the above-mentioned units.

[0092] It should be noted that the features such as “same diffraction angle”, “parallel optical paths”, and “parallel to each other” described in the embodiments of the present application are intended to indicate that the two light signals with the same exit position on the light source assembly 21 have the same exit direction after passing through the metalens assembly 22. However, in the actual near-eye display system 1, due to the errors of the optical product itself, the diffraction angles of the two light signals with the same exit position on the light source assembly 21 may have certain deviations. It should be understood that, taking into account this deviation in diffraction angle, the two light signals with the same exit position on the light source assembly 21 may not be absolutely parallel after passing through the metalens assembly 22, but may be approximately parallel. This situation also falls within the scope to be protected by the present application.

[0093] Based on this, in some embodiments, if the two light signals have the same emission position on the light source assembly 21 , the diffraction angles obtained by the two light signals after passing through the super lens assembly 22 have an error range of ±3 degrees.

[0094] Please refer to FIG8 , which is a schematic structural diagram of another embodiment of a near-eye display system provided in an embodiment of the present application.

[0095] As shown in FIG8 , in some other embodiments, the optical waveguide module 10 is configured as at least a double-layer waveguide lens. Specifically, the optical waveguide module 10 includes at least a first waveguide plate 11 and a second waveguide plate disposed on a side of the first waveguide plate 11 away from the super lens assembly 22 .

[0096] It should be noted that the image light signal includes at least a first type of light signal and a second type of light signal, and the wavelengths of the first type of light signal and the second type of light signal are different. The optical waveguide module 10 includes at least a first waveguide plate 11 and a second waveguide plate disposed on a side of the first waveguide plate 11 away from the metalens assembly 22. The first coupling-in grating region 111 and the first coupling-out grating region 112 are disposed on the first waveguide plate 11, and the second waveguide plate is provided with a second coupling-in grating region 121 and a second coupling-out grating region 122.

[0097] In which, the first waveguide plate 11 is configured to transmit the first type of optical signal incident to the first coupling-in grating region 111 to the first coupling-out grating region 112, and diffract the second type of optical signal incident to the first coupling-in grating region 111 to the second coupling-in grating region 121; the second waveguide plate is configured to transmit the second type of optical signal incident to the second coupling-in grating region 121 to the second coupling-out grating region 122, and diffract from the second coupling-out grating region 122 to the first coupling-out grating region 112, so that the first type of optical signal and the second type of optical signal converge in the first coupling-out grating region 112.

[0098] Specifically, the propagation path of the first type of optical signal in the optical waveguide module 10 is as follows: the first type of optical signal enters the first waveguide plate 11 from the first coupling-in grating region 111 , and propagates to the first coupling-out grating region 112 via the first waveguide plate 11 .

[0099] The propagation path of the second type of optical signal in the optical waveguide module 10 is as follows: the second type of optical signal enters the first waveguide plate 11 from the first coupling-in grating region 111, is diffracted by the first coupling-in grating region 111 to the second coupling-in grating region 121 and enters the second waveguide plate, then propagates through the second waveguide plate to the second coupling-out grating region 122, and then is diffracted by the second coupling-out grating region 122 to the first coupling-out grating region 112. The first type of optical signal and the second type of optical signal converge at the first coupling-out grating region 112 and are emitted from the first coupling-out grating region 112 to propagate to the field of view of the target object.

[0100] It should be understood that optical signals of different wavelengths correspond to different colors (for example, RGB). By setting different waveguides to propagate optical signals of different wavelengths, the dispersion problem that may occur when optical signals of different wavelengths propagate in the same waveguide due to different diffraction angles is avoided, thereby solving the problem of uneven color of the optical signal emitted from the first optical coupling area.

[0101] In some embodiments, the wavelength of the first type of optical signal is smaller than the wavelength of the second type of optical signal, that is, the first waveguide plate 11 is used to propagate optical signals with relatively smaller wavelengths.

[0102] In some embodiments, the wavelength of the first type of optical signal is within a preset first wavelength range, the wavelength of the second type of optical signal is within a preset second wavelength range, and the maximum value of the first wavelength range is less than or equal to the minimum value of the second wavelength range.

[0103] Exemplarily, the first type of optical signal can be set to blue light with a relatively shorter wavelength, that is, the first waveguide plate 11 is used to propagate blue light with a relatively smaller wavelength; the second type of optical signal can be green light and red light with a relatively longer wavelength, that is, the first waveguide plate 11 is used to propagate green light and red light with a relatively longer wavelength.

[0104] It should be noted that when the optical waveguide module 10 is configured as at least a double-layer waveguide lens, the first waveguide plate 11 and the second waveguide plate can be arranged in a bonded manner or spaced apart from each other.

[0105] As shown in Figure 8, in some embodiments, the first coupling-in grating region 111 and the second coupling-in grating region 121 are arranged relative to each other in the thickness direction of the optical waveguide module 10, and the first coupling-out grating region 112 and the second coupling-out grating region 122 are arranged relative to each other in the thickness direction of the optical waveguide module 10.

[0106] Specifically, the propagation path of the second type of optical signal in the optical waveguide module 10 can also be: the second type of optical signal passes through the first coupling grating area 111 through the first waveguide plate 11, propagates to the second coupling grating area 121 and enters the second waveguide plate, and then propagates to the second coupling grating area 122 through the second waveguide plate, and then diffracts through the second coupling grating area 122 and passes through the first waveguide plate 11 again, and converges with the first type of optical signal in the first coupling grating area 112 and emits.

[0107] Please refer to FIG9 , which is a schematic diagram of an optical path structure of an implementation manner of a near-eye display system 1 provided in an embodiment of the present application.

[0108] As shown in Figure 9, in some embodiments, the super lens assembly 22 includes at least one super lens lens 23, wherein each super lens lens 23 includes a substrate 221 and a corresponding super surface structure 222, and at least one super lens lens 23 is discretely arranged between the light source assembly 21 and the optical waveguide module 10.

[0109] Specifically, the propagation path of the image light signal is emitted from the light source assembly 21, and then sequentially propagates through each metal lens 23 to the first coupling-in grating region 111 of the optical waveguide module 10. It should be noted that the metal lens assembly 22 can include a single metal lens 23 (as shown in FIG. 2 ), can include two metal lenses 23 (as shown in FIG. 9 ), or can be provided with a greater number of metal lenses 23.

[0110] It should be understood that compared to the numerous lenses in the lens assembly of traditional near-eye display products, providing at least two metalens 23 to replace the lens assembly reduces the number of lenses used, thereby reducing the size and weight of the lens while ensuring high image quality and a wide field of view. Furthermore, designs in which the metalens assembly 22 includes two or three metalens 23 can better eliminate chromatic aberration than designs in which only a single metalens 23 is provided.

[0111] Please refer to FIG10 , which is a schematic diagram of an optical path structure of an implementation manner of a near-eye display system provided in an embodiment of the present application.

[0112] As shown in FIG10 , in some embodiments, the near-eye display system 1 further includes at least one unit lens 24 , and the unit lens 24 includes but is not limited to a convex lens or a concave lens:

[0113] At least one unit lens 24 and at least one super lens 23 are separately arranged between the light source assembly 21 and the optical waveguide module 10 .

[0114] Specifically, as shown in Figure 10, a unit lens lens 24 and a super lens lens 23 can be set and arranged separately between the light source component 21 and the optical waveguide module 10. It should be understood that the number of unit lens lenses 24 and super lens lenses 23 can be adjusted according to the size requirements of the optical machine module 20 and the design requirements for eliminating dispersion, so as to achieve a better balance between small size and good optical performance.

[0115] It should be noted that in addition to directly replacing the entire lens group with a super lens assembly 22 composed of a metasurface lens, at least one unit lens 24 and at least one super lens 23 can be set on the optical path between the light source assembly 21 and the optical waveguide module 10 to be compatible with the traditional single-piece lens and the super lens 23. This can also reduce the number of lenses used, and can reduce the volume and weight of the lens while ensuring the design requirements of high image quality and a large field of view. Moreover, compared with only setting a single super lens 23, the combination of at least one unit lens 24 and at least one super lens 23 can better eliminate dispersion.

[0116] Please refer to Figures 11 and 12. Figure 11 is a module diagram of an implementation of AR glasses provided in an embodiment of the present application, and Figure 12 is a structural diagram of an implementation of AR glasses provided in an embodiment of the present application.

[0117] As shown in Figures 11 and 12, an embodiment of the present application also provides an AR glasses 3, including: the AR glasses 3 include a frame module 2 and any one of the near-eye display systems 1 provided in the embodiment of the present application, and the near-eye display system 1 is installed on the frame module 2.

[0118] It should be understood that the frame module 2 is used to provide wearing support for the target user. When the target user uses the AR glasses 3, wearing can be achieved through the frame module 2. On the other hand, any near-eye display system 1 provided in the embodiments of the present application is mounted on the frame module 2 to emit light signals to the field of view of the target user.

[0119] As shown in Figures 2 and 12, specifically, the light source component 21 in the near-eye display system 1 outputs an image light signal to the super lens component 22, and the image light signal includes at least two types of light signals with different properties, and the properties of the light signal include at least one of wavelength, exit angle and exit position; the super lens component 22 in the near-eye display system 1 is used to receive the image light signal and diffract each light signal of the image light signal to the first coupling-in grating area 111, wherein light signals with the same exit position have the same diffraction angle; the optical waveguide module 10 is formed with a first coupling-in grating area 111 and a first coupling-out grating area 112, and the optical waveguide module 10 is used to receive the light signal through the first coupling-in grating area 111, transmit the received light signal to the first coupling-out grating area 112, and emit the light signal from the first coupling-out grating area 112. When the target object wears the near-eye display system 1 , the target object's field of view is opposite to the first outcoupling grating area 112 of the optical waveguide module 10 , and the light signal emitted from the outcoupling area enters the target object's field of view to display the corresponding image.

[0120] Furthermore, the AR glasses 3 also include a control component electrically connected to the light source component 21, and the control component is used to control the light signal output of the optical machine to adjust the image displayed by the AR glasses 3 to the target object.

[0121] In some embodiments, the frame module 2 includes a frame assembly 21 and a temple assembly 22 connected to the frame assembly 21;

[0122] Among them, the optical waveguide module 10 in the near-eye display system 1 is installed on the frame assembly 21, and the optical machine module 20 in the near-eye display system 1 is arranged on the side of the frame assembly 21 close to the temple assembly 22 and corresponding to the first coupling grating area 111 of the optical waveguide module 10.

[0123] Specifically, in the direction from the temple assembly 22 toward the frame assembly 21, the light source assembly 21, the super lens assembly 22 and the optical waveguide module 10 are arranged in sequence, and the light source assembly 21 is used to emit image light signals in the direction from the temple assembly 22 toward the frame assembly 21.

[0124] In some embodiments, the near-eye display system 1 further includes a near-eye lens module 4 , which is mounted on the frame assembly 21 and disposed corresponding to the first outcoupling grating region 112 of the optical waveguide module 10 .

[0125] Specifically, when the target object wears the AR glasses 3 , the optical signal emitted from the first outcoupling grating region 112 of the optical waveguide module 10 of the near-eye display system 1 is transmitted through the near-eye lens module 4 to the field of view of the target object.

[0126] In some embodiments, the near-eye lens module 4 includes one of a dioptric lens and a plano lens.

[0127] It should be noted that the refractive lens is used to adjust the light input into the refractive lens to meet the user's vision correction needs. For example, when the user has vision correction needs, the light signal output by the near-eye display system 1 is incident on the refractive lens, and the light from the outside world directed toward the AR glasses 3 is incident on the refractive lens through the optical waveguide module 10. All light signals incident on the refractive lens are corrected and transmitted to the field of view of the target object.

[0128] It should be understood that if there is no need for vision correction, the refractive lens can be replaced with a plano lens, and the light incident from the outside and the light signal output by the near-eye display system 1 are superimposed and pass through the plano lens into the field of view of the target object.

[0129] In some embodiments, the refractive lens is configured to have one flat side and one concave side, wherein, if the refractive lens is used to solve the user's myopia vision correction needs, the flat side of the refractive lens faces the optical waveguide module 10, and the concave side of the refractive lens faces away from the optical waveguide module 10, so that the size of the AR glasses 3 in the thickness direction of the refractive lens can be further compressed, and it is convenient to control the distance between the refractive lens and the optical waveguide module 10 during the production process.

[0130] Exemplarily, as shown in FIG12 , the near-eye lens module 4 includes a refractive lens, and the refractive lens is configured with one flat side and one concave side, the flat side of the refractive lens faces the optical waveguide module 10 , and the concave side of the refractive lens faces away from the optical waveguide module 10 .

[0131] In other embodiments, the refractive lens is configured as a refractive lens with one concave side and one convex side. If the refractive lens is used to solve the user's myopia correction needs, the convex side of the refractive lens faces the optical waveguide module 10, while the concave side of the refractive lens faces away from the optical waveguide module.

[0132] Furthermore, the convex surface of the refractive lens is relatively flatter than the concave surface of the refractive lens, that is, the plane of the refractive lens facing the optical waveguide module 10 is a plane with a slight curvature.

[0133] In summary, the embodiment of the present application provides a near-eye display system 1 and AR glasses 3, wherein the near-eye display system 1 includes: an optical waveguide module 10, which is formed with a first coupling-in grating area 111 and a first coupling-out grating area 112, and the optical waveguide module 10 is used to receive an optical signal through the first coupling-in grating area 111, transmit the received optical signal to the first coupling-out grating area 112, and emit an optical signal from the first coupling-out grating area 112; an optical machine module 20, the optical machine module 20 includes a light source component 21 arranged relative to the first coupling-in grating area 111 and a light source component 21 arranged between the light source component 21 and the optical waveguide module. 10, the light source component 21 is used to output an image light signal to the super lens component 22, the image light signal includes at least two types of light signals with different properties, the properties of the light signal include at least one of wavelength, exit angle and exit position; the super lens component 22 includes at least a substrate 221 and a super surface structure 222 arranged on the substrate 221, and the super surface structure 222 is configured to receive the image light signal and diffract each light signal of the image light signal to the first coupling grating area 111, wherein the light signals with the same exit position have the same diffraction angle. Therefore, the near-eye display system 1 and AR glasses 3 provided in the embodiment of the present application reduce the volume and weight of the lens through the setting of the super lens component 22, thereby reducing the size and weight of the optical machine module 20, and at the same time meet the design requirements of high image quality and large field of view.

[0134] It will be understood by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In a hardware embodiment, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or may be implemented as hardware, or may be implemented as a setting circuit, such as a dedicated setting circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium).

[0135] It should be understood that the terms used in this specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. As used in this specification of the present application and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0136] It should also be understood that the term "and / or" used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, including these combinations. It should be noted that, in this document, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or system.

Claims

1. A near-eye display system, characterized in that, The near-eye display system includes: An optical waveguide module, which is formed with a first coupling grating region and a first output coupling grating region. The optical waveguide module is configured to receive an optical signal through the first coupling grating region, transmit the received optical signal to the first output coupling grating region, and output the optical signal from the first output coupling grating region; An optical engine module, which includes a light source component disposed opposite to the first coupling grating region and a metalens component disposed between the light source component and the optical waveguide module. The light source component is configured to output an image optical signal to the metalens component. The image optical signal includes at least two types of optical signals with different attributes, and the attributes of the optical signals include at least one of wavelength, emission angle, and emission position; The metalens component at least includes a substrate and a metasurface structure disposed on the substrate, and the metasurface structure is configured to receive the image optical signal and diffract each of the optical signals in the image optical signal to the first coupling grating region, wherein the optical signals with the same emission position have the same diffraction angle.

2. The near-eye display system according to claim 1, wherein, The near-eye display system has an exit pupil position, and the exit pupil position is opposite to the first coupling grating region. The metasurface structure is configured to diffract the optical signal to the first coupling grating region through the exit pupil position.

3. The near-eye display system according to claim 1, wherein The metasurface structure includes a plurality of metasurface unit groups, and the plurality of metasurface unit groups are arranged periodically along the center of the substrate to the outside.

4. The near-eye display system according to claim 3, wherein The metasurface unit group includes a plurality of the metasurface units arranged in a ring along the center of the substrate.

5. The near-eye display system according to claim 4, wherein The metasurface unit includes at least one nanorod protruding from one side of the substrate facing the light source component or one side of the substrate facing the optical waveguide module, and the protruding directions of the nanorods on the substrate are the same; Wherein, the nanorod is configured to diffract the optical signal incident on the nanorod to the first coupling grating region.

6. The near-eye display system according to claim 5, wherein, The protruding height H of the nanorod in the first direction satisfies: H > λ0 / (n1 - n2) Wherein, λ0 is the wavelength of the optical signal incident on the nanorod, n1 is the refractive index of the nanorod material, n2 is the refractive index of air, and the first direction is perpendicular to the extension direction of the substrate.

7. The near-eye display system according to claim 5, wherein, The diameter D and height H of the nanorod satisfy: D > 60nm, 300nm < H < 3μm, H / D < 20.

8. The near-eye display system according to claim 4, wherein, The metasurface unit is rectangular, and the length and width of the metasurface unit are both greater than 100nm and less than 3000nm.

9. The near-eye display system according to any one of claims 1-8, characterized in that, The image optical signal includes a first type of optical signal and a second type of optical signal, and the wavelengths of the first type of optical signal and the second type of optical signal are different; The optical waveguide module at least includes a first waveguide sheet and a second waveguide sheet disposed on a side of the first waveguide sheet away from the metalens component. The first coupling grating region and the first output coupling grating region are disposed on the first waveguide sheet, and the second waveguide sheet is provided with a second coupling grating region and a second output coupling grating region; Wherein, the first waveguide sheet is configured to transmit the first type of optical signal incident on the first coupling grating region to the first output coupling grating region, and diffract the second type of optical signal incident on the first coupling grating region to the second coupling grating region; The second waveguide sheet is configured to transmit the second type of optical signal incident on the second coupling grating region to the second output coupling grating region, and diffract it from the second output coupling grating region to the first output coupling grating region, so that the first type of optical signal and the second type of optical signal converge at the first output coupling grating region.

10. The near-eye display system according to claim 9, wherein, The first coupling grating region and the second coupling grating region are disposed opposite to each other in the thickness direction of the optical waveguide module, and the first output coupling grating region and the second output coupling grating region are disposed opposite to each other in the thickness direction of the optical waveguide module.

11. The near-eye display system according to any one of claims 1-8, characterized in that, The super lens assembly includes at least one super lens lens. Wherein, each of the super lens lenses includes the substrate and the corresponding metasurface structure, and at least one of the super lens lenses is separately arranged between the light source assembly and the optical waveguide module.

12. The near-eye display system according to claim 11, wherein The near-eye display system further includes at least one unit lens lens, and the unit lens lens includes, but is not limited to, a convex lens lens or a concave lens lens: Wherein, at least one of the unit lens lenses and at least one of the super lens lenses are separately arranged between the light source assembly and the optical waveguide module.

13. An AR glasses, characterized in that, The AR glasses include a frame module and the near-eye display system according to any one of claims 1-12, and the near-eye display system is installed on the frame module.

14. The AR glasses according to claim 13, wherein The frame module includes a frame assembly and temple assemblies connected to the frame assembly; Wherein, the optical waveguide module in the near-eye display system is installed on the frame assembly, and the optical engine module in the near-eye display system is disposed on one side of the frame assembly close to the temple assembly and corresponding to the first coupling grating region of the optical waveguide module.

15. The AR glasses according to any one of claims 1-8, characterized in that, The AR glasses further include a near-eye lens module, and the near-eye lens module is installed on the frame assembly and corresponding to the first output coupling grating region of the optical waveguide module.

16. The AR glasses according to claim 13, wherein, The near-eye lens module includes one of a refractive lens and a plano lens. 。

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