CN115079323A - Two-dimensional coupling-out grating, two-dimensional diffraction optical waveguide, and near-to-eye display device - Google Patents
Two-dimensional coupling-out grating, two-dimensional diffraction optical waveguide, and near-to-eye display device Download PDFInfo
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- CN115079323A CN115079323A CN202211016163.XA CN202211016163A CN115079323A CN 115079323 A CN115079323 A CN 115079323A CN 202211016163 A CN202211016163 A CN 202211016163A CN 115079323 A CN115079323 A CN 115079323A
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Abstract
The invention provides a two-dimensional coupling-out grating, a two-dimensional diffraction optical waveguide and near-to-eye display equipment, and relates to the technical field of optical waveguide display, wherein the two-dimensional coupling-out grating comprises a plurality of same optical structures; the optical structure is formed by curve connection; the optical structures are in a cross shape or a combined cross shape, the optical structures are arranged in an equally-spaced array, and the distances between the pattern central point of each optical structure and the pattern central points of other adjacent optical structures are equal. By adopting the mode, the two-dimensional pupil expansion is carried out by adopting the crossed or combined crossed optical structure, so that the uniformity of the waveguide exit pupil is high, and the image banding phenomenon is weakened, thereby obtaining an image with good uniformity; moreover, the optical structure is formed by connecting curves, the curve edge has better experimental tolerance compared with the straight line edge, and the uniformity of the exit pupil can be further improved by adjusting the curvature of the curve.
Description
Technical Field
The invention relates to the technical field of optical waveguide display, in particular to a two-dimensional coupling-out grating, a two-dimensional diffraction optical waveguide and near-to-eye display equipment.
Background
The near-eye display device is used as a main display device of virtual reality and augmented reality technologies, can superimpose virtual images onto real scenery, has perspective characteristics at the same time, and does not affect normal observation of the real scenery. The near-eye display device may employ a variety of display technologies such as prisms, transflective lenses, free-form surface waveguides, mirror array waveguides, diffractive waveguides, and the like.
The diffraction waveguide display technology utilizes diffraction gratings to realize light incidence, turning and emergence, utilizes a total reflection principle to realize light transmission, and transmits an image of a micro display to human eyes so as to see a virtual image. And, because of adopting the total reflection principle the same as optical fiber technology, the diffraction waveguide component can be made as light and thin as the common spectacle lens, meanwhile because the turning to the light is realized through the diffraction grating on the surface of the waveguide, have no relation with the shape of the waveguide basically, therefore easy to make in batches, the production cost is low.
However, diffractive waveguides are an emerging technology, and although the technology has reached a higher level, many challenges still exist, such as improving exit pupil uniformity, which is an urgent problem to be solved. The low uniformity of the exit pupil of the waveguide results in an image that is prone to banding, i.e., the image is brighter in the middle and darker on either side.
Disclosure of Invention
The invention provides a two-dimensional coupling-out grating, a two-dimensional diffraction optical waveguide and a near-to-eye display device, which are used for solving the defects that the uniformity of a waveguide exit pupil is low and the image is easy to generate a banding effect in the prior art.
The invention provides a two-dimensional coupling-out grating, which comprises a plurality of same optical structures; the optical structures are formed by curve connection, the optical structures are in a cross shape or a combined cross shape, the optical structures are arranged in an equally-spaced array, and the distances between the pattern central point of each optical structure and the pattern central points of other adjacent optical structures are equal.
According to the two-dimensional coupling-out grating provided by the invention, the optical structure comprises two subunits with the same shape, the subunits are formed by curve connection, the two subunits are arranged in a crossed manner, and the two subunits have one and only one cross point.
According to the two-dimensional coupling-out grating provided by the invention, the sub-unit comprises two convex curves, and the two convex curves are symmetrically arranged.
According to the two-dimensional coupling-out grating provided by the invention, under the condition that the subunit comprises two convex curves, expansion parts are arranged at two ends of the subunit and are formed by connecting the curves.
According to the two-dimensional coupling-out grating provided by the invention, under the condition that the subunit comprises two convex curves, the expansion part comprises two convex curves, and the two convex curves of the expansion part are symmetrically arranged.
According to the two-dimensional coupling-out grating provided by the invention, the sub-unit comprises two concave curves, and the two concave curves are symmetrically arranged.
According to the two-dimensional coupling-out grating provided by the invention, under the condition that the subunit comprises two concave curves, expansion parts are arranged at two ends of the subunit and are formed by connecting curves.
According to the two-dimensional coupling-out grating provided by the invention, under the condition that the subunit comprises two concave curves, the expansion part comprises two concave curves, and the two concave curves of the expansion part are symmetrically arranged.
According to the two-dimensional coupling-out grating provided by the invention, the intersection included angle of the two subunits is 0-120 degrees.
The present invention also provides a two-dimensional diffractive optical waveguide comprising: the grating structure comprises a waveguide substrate, a one-dimensional coupling-in grating and a two-dimensional coupling-out grating, wherein the one-dimensional coupling-in grating and the two-dimensional coupling-out grating are arranged on the surface of the waveguide substrate; the one-dimensional coupling grating is used for coupling incident light carrying image information into the waveguide; the two-dimensional coupling-out grating is used for coupling out the diffracted light which comes from the one-dimensional coupling-in grating and is conducted in the waveguide in a total reflection mode to the human eye for imaging while diffracting and expanding the diffracted light in two directions.
The invention also provides near-eye display equipment which comprises the two-dimensional diffraction optical waveguide.
According to the two-dimensional coupling-out grating, the two-dimensional diffraction optical waveguide and the near-to-eye display device, the two-dimensional coupling-out grating comprises a plurality of same optical structures; the optical structure is formed by curve connection; the optical structures are in a cross shape or a combined cross shape and are arranged in an equally spaced array. The two-dimensional coupling-out grating is used for coupling out the diffracted light which comes from the one-dimensional coupling-in grating and is conducted in the waveguide in a total reflection mode to the human eye for imaging while diffracting and expanding the diffracted light in two directions. The invention adopts a crossed or combined crossed optical structure to carry out two-dimensional pupil expansion, so that the waveguide exit pupil has high uniformity, and the image banding phenomenon is weakened to obtain an image with good uniformity; and the curved edges have better experimental tolerances than the straight edges and the uniformity of the exit pupil can be further improved by adjusting the curvature of the curve.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a cross-shaped two-dimensional outcoupling grating of the present invention;
FIG. 2 is a schematic diagram of the diffraction efficiency of a cylindrical grating and a cross grating directly entering a human eye as a function of the angle of incidence;
FIG. 3 is a graph showing the diffraction efficiency of the rotating orders of a cylindrical grating and a cross-shaped grating as a function of the angle of incidence;
FIG. 4 is a graph showing the diffraction optical efficiency ratio of a cylindrical grating and a cross-shaped grating as a function of the incident angle;
FIG. 5 is a schematic structural diagram of another embodiment of the crossed two-dimensional outcoupling grating of the present invention;
FIG. 6 is a diagram showing the variation of the diffraction efficiency ratio with the incident angle when the ratio of the major axis and the minor axis of the cross-shaped two-dimensional coupling grating subunit of the present invention takes different values;
FIG. 7 is a schematic structural diagram of an embodiment of a combined cross-shaped two-dimensional outcoupling grating of the present invention;
FIG. 8 is a schematic structural diagram of another embodiment of a combined cross-shaped two-dimensional outcoupling grating of the present invention;
FIG. 9 is a diagram showing the variation of the diffraction optical efficiency ratio with the incident angle when the ratio of the long axis of the expansion part and the short axis of the crossed sub-unit of the combined crossed two-dimensional outcoupling grating of the present invention takes different values;
fig. 10 is a schematic diagram of an embodiment of a two-dimensional diffractive optical waveguide of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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 invention.
The invention provides a two-dimensional coupling-out grating which can be applied to a two-dimensional diffraction optical waveguide. Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a cross-shaped two-dimensional outcoupling grating according to the present invention.
The diffractive optical waveguide is mainly classified into a one-dimensional diffractive optical waveguide that uses a one-dimensional grating for exit pupil expansion and a two-dimensional diffractive optical waveguide that uses a two-dimensional grating for exit pupil expansion. The two-dimensional diffraction optical waveguide adopts the two-dimensional grating to carry out two-way pupil expansion and simultaneously couple out light to human eyes for imaging, and realizes a larger eye movement range while ensuring the volume and the weight of the optical waveguide.
The two-dimensional light coupling grating comprises a plurality of same optical structures; each optical structure is formed by curve connection, and the optical structures are in a cross shape or a combined cross shape.
The optical structures are arranged in an equally spaced array, and the pattern center point of each optical structure is equidistant from the pattern center points of other adjacent optical structures.
Optionally, the two-dimensional coupling grating can be surface relief grating, volume holographic grating, super surface grating, or the like.
The Surface Relief Grating (Surface Relief Grating) is a Grating structure formed by 'Relief', and the manufacturing process of the Surface Relief Grating is similar to the process of manufacturing a chip and is called Nano-imprinting (Nano-imprinting). The surface relief grating can generate a grating microstructure with a nanometer scale on a plane.
A Volume Holographic Grating (Volume Holographic Grating) is a Grating generated by a Holographic exposure technique. The volume holographic grating uses holographic exposure technology in the production process. Volume holography is understood to mean a coating which can be "developed" by exposure to laser light to form fringes of different refractive index, i.e. another form of grating. The volume holographic grating is made of organic material and is a material with photoinduced refractive index change. Depending on the degree of exposure, the refractive index properties of the material may change. That is, the volume holographic grating does not directly form a topography on a plane, but its internal material properties change.
The super surface Grating (metassurface Grating) is made of a metamaterial, and can be directly used for constructing the regulation and control of an optical phase on a plane, and the preparation of the super surface Grating needs to depend on a semiconductor photoetching process.
The two-dimensional coupling-out grating is used for coupling out the diffracted light which comes from the one-dimensional coupling-in grating and is guided in the waveguide in a total reflection mode to the human eye for imaging while diffracting and expanding the diffracted light in two directions.
The total reflection is a special phenomenon that light is emitted from a high refractive index medium to a low refractive index medium, and the incident angle is equal to or greater than a critical angle. That is, when the total reflection condition is satisfied, light is continuously propagated forward in the slab waveguide by reflection and is not transmitted out, so that the propagation direction of light can be changed.
Based on the total reflection principle, the diffraction optical waveguide can transfer the image projected by the optical machine in an equal proportion, and then the optical machine can be placed at the top or the side of the glasses.
Referring to fig. 2 to 4, fig. 2 is a schematic diagram showing the variation of the diffraction efficiency of the cylindrical grating and the cross grating directly entering the human eye with the incident angle; FIG. 3 is a graph showing the diffraction efficiency of the rotating orders of the cylindrical grating and the cross-shaped grating as a function of the incident angle; FIG. 4 is a graph showing the diffraction optical efficiency ratio of a cylindrical grating and a cross-shaped grating as a function of the incident angle.
Wherein, the diffraction light efficiency ratio is the ratio of the efficiency of the diffraction light directly entering human eyes and the efficiency of the diffraction light entering human eyes after rotating.
When the two-dimensional coupling grating structure is cylindrical, the efficiency of diffraction light directly entering human eyes is high, the efficiency of rotation-level diffraction light is low, the efficiency of diffraction light entering human eyes after rotation is low, the ratio of the efficiency of diffraction light directly entering human eyes to the efficiency of diffraction light entering human eyes after rotation is high, the uniformity of waveguide exit pupils is low, and the phenomenon of banding of images occurs.
Therefore, the invention provides a crossed or combined crossed two-dimensional coupling grating, the efficiency of the diffraction light directly entering human eyes of the crossed or combined crossed two-dimensional coupling grating is obviously reduced, the efficiency of the diffraction light of a rotating order is obviously increased, the efficiency of the diffraction light entering human eyes after rotating is obviously increased, the ratio of the efficiency of the diffraction light directly entering human eyes to the efficiency of the diffraction light entering human eyes after rotating is reduced, when the ratio is close to 1, the uniformity of the waveguide exit pupil is high, the banding phenomenon of an image is weakened, and the image has good uniformity.
In some embodiments, the optical structure comprises two identically shaped sub-units, the sub-units being formed by curved connections, the two sub-units being arranged crosswise, the two sub-units having one and only one intersection point.
The intersection angle of the two subunits is 0-120 degrees, and preferably the intersection angle of the two subunits is 60 degrees. The exit pupil uniformity of the two-dimensional outcoupling grating is now optimal.
Referring to fig. 5, fig. 7 and fig. 8, fig. 5 is a schematic structural diagram of another embodiment of the crossed two-dimensional outcoupling grating of the present invention; FIG. 7 is a schematic structural diagram of an embodiment of a combined cross-shaped two-dimensional outcoupling grating of the present invention; fig. 8 is a schematic structural diagram of another embodiment of the combined cross-shaped two-dimensional outcoupling grating of the present invention.
Optionally, the subunit comprises two convex curves or two concave curves. When the subunit includes two convex curves, the two-dimensional outcoupling grating structure is as shown in fig. 1, and the two convex curves are symmetrically arranged; when the subunit includes two concave curves, the two-dimensional outcoupling grating structure is as shown in fig. 5, and the two concave curves are symmetrically arranged.
The curved edge structure of the two-dimensional outcoupling grating will have better experimental tolerance than the straight edge and the uniformity can be improved by adjusting the curvature of the curved edges, as shown in fig. 6, fig. 6 is a diagram illustrating the variation of the diffraction optical efficiency ratio with the incident angle when the ratio of the major axis and the minor axis of the cross-shaped two-dimensional outcoupling grating subunits of the present invention takes different values. It can be seen that the diffraction light efficiency ratio varies greatly when the ratio of the major axis to the minor axis of the crossed sub-unit takes different values.
In other embodiments, the two ends of the sub-unit may be further provided with expansion parts, and the expansion parts are formed by connecting curves.
Optionally, the expansion comprises two convex curves or two concave curves. When the expansion part comprises two convex curves, the two-dimensional coupling light grating structure is as shown in fig. 7, and the two convex curves of the expansion part are symmetrically arranged; when the expansion portion includes two concave curves, the two-dimensional coupling-out grating structure is as shown in fig. 8, and the two concave curves of the expansion portion are symmetrically arranged.
It should be noted that the curve of the expansion part and the curve of the subunit do not need to be set correspondingly, and when the subunit includes two convex curves, the expansion part may include two concave curves; when the sub-unit includes two concave curves, the expansion portion may include two convex curves.
The two ends of the sub-unit are provided with the expansion parts, the expansion parts introduce more structural parameters for the two-dimensional outcoupling grating, and the uniformity can be improved by adjusting the structural parameters, as shown in fig. 9, fig. 9 is a schematic diagram showing the change of the diffraction light efficiency ratio with the incident angle when the ratio of the long axis of the expansion part of the combined cross-shaped two-dimensional outcoupling grating and the short axis of the cross sub-unit takes different values. As can be seen from the graph, when the ratio of the expansion part major axis and the crossing sub-unit minor axis takes different values, the diffraction light efficiency ratio is greatly changed.
It should be noted that the optical structure in which the expansion portions are provided at both ends of the sub-unit is understood as an improvement based on the cross-shaped optical structure, that is, the combined cross-shaped optical structure has a higher manufacturing process than the cross-shaped optical structure, but introduces more structural parameters.
Based on the same inventive concept, the invention also provides a two-dimensional diffraction light waveguide, which comprises a waveguide substrate, a one-dimensional coupling-in grating and the two-dimensional coupling-out grating, wherein the one-dimensional coupling-in grating and the two-dimensional coupling-out grating are arranged on the surface of the waveguide substrate.
Referring to fig. 10, fig. 10 is a schematic diagram illustrating a two-dimensional diffractive optical waveguide according to an embodiment of the present invention.
The one-dimensional coupling grating is used for coupling incident light carrying image information into the waveguide; the two-dimensional coupling-out grating is used for coupling out the diffracted light which comes from the one-dimensional coupling-in grating and is conducted in the waveguide in a total reflection mode to the human eye for imaging while diffracting and expanding the diffracted light in two directions.
Alternatively, both the one-dimensional incoupling grating and the two-dimensional outcoupling grating may employ an embossed grating, a volume holographic grating, or a super-surface grating.
In some embodiments, the one-dimensional incoupling grating may be a rectangular grating, a tilted grating, or a blazed grating.
The rectangular grating is simple in structure, but the 0 th order diffraction occupies more than 80% of the energy, while the useful ± 1 st order diffraction is less than 20% of the energy utilization.
When the grating is scribed into sawtooth-shaped groove sections, the light energy of the grating is concentrated in a predetermined direction, i.e. a certain spectral order. When detecting from this direction, the intensity of the spectrum is at its maximum, a phenomenon known as blaze (blaze), and such gratings are known as blazed gratings. When the blazed grating is used for a visible light wave band, the requirement on the precision of a production process is very high, so that the yield of large-scale production is low;
the +1 order or-1 order diffracted light energy of the tilted grating can be as high as 97%, which is more suitable for waveguide diffraction transmission and imaging. The design and preparation process of the inclined grating has higher difficulty compared with the rectangular grating, but the design process of the inclined grating has higher degree of freedom, and the modulation of the wavelength bandwidth and the angle bandwidth of incident light can be realized by designing the inclined angle.
The one-dimensional incoupling grating couples incident light carrying image information into the diffractive waveguide, which guides the incoupling light in a total reflection manner. The two-dimensional coupling-out grating couples out the diffracted light which comes from the one-dimensional coupling-in grating and is transmitted in a total reflection mode in the waveguide to the human eye for imaging while diffracting and expanding the diffracted light in two directions.
The two-dimensional coupling grating can be regarded as a unit structure formed by arraying along two directions, the included angle between the two array directions is generally 60 degrees, and the two arrays respectively form two one-dimensional gratings (grating G2 and grating G2').
When the diffracted light from the one-dimensional incoupling grating G1 is conducted to the two-dimensional outcoupling grating region and is incident on the two-dimensional outcoupling grating, the diffracted light will again undergo multiple simultaneous diffractions. The diffracted light can be diffracted to the zeroth order, which does not change the propagation direction of the diffracted light; the diffracted light can also be coupled out of the waveguide (i.e., the diffracted light that enters the human eye directly), into the human eye for imaging; the diffracted light may also be diffracted by grating G2 into the first diffraction order (rotation order 1), which is totally reflected within the waveguide in the vector direction of grating G2 for propagation, and will continue to interact further with the two-dimensional outcoupling grating, and each subsequent interaction will couple light out of the waveguide into the human eye for imaging.
The diffracted light can also be diffracted by grating G2 'into the first diffraction order (rotation order 2), which is totally reflected within the waveguide along the vector direction of grating G2', will continue to interact further with the two-dimensional outcoupling grating, and each subsequent interaction will also couple light out of the waveguide into the eye for imaging.
When the included angle between the grating G2 and the grating G2 'is 60 degrees, and the two-dimensional coupling light grating unit structure is symmetrical along the bisector of the included angle between the grating G2 and the grating G2', the rotation level 1 and the rotation level 2 are symmetrical and equal, which means that light expands and conducts to the left and right sides while expanding and conducting downwards in the two-dimensional coupling light grating area, so that the light expands simultaneously and rapidly in two dimensions, the size of the waveguide can be kept to be minimum, and the diffraction waveguide can be adapted to a more compact display.
According to the technical scheme, the two-dimensional diffraction optical waveguide provided by the invention adopts the crossed or combined crossed two-dimensional coupling grating to perform two-dimensional pupil expansion, so that the uniformity of the waveguide exit pupil is high, and the image banding phenomenon is weakened, so that an image with good uniformity is obtained; and the curved edges have better experimental tolerances than the straight edges and the uniformity of the exit pupil can be further improved by adjusting the curvature of the curve.
In some embodiments, the two-dimensional outcoupling grating includes several identical optical structures; the optical structure is formed by curve connection; the optical structures are in a cross shape or a combined cross shape, the optical structures are arranged in an equally-spaced array, and the distances between the pattern central point of each optical structure and the pattern central points of other adjacent optical structures are equal.
In some embodiments, the optical structure comprises two identically shaped sub-units, the sub-units being formed by curved connections, the two sub-units being arranged crosswise, the two sub-units having one and only one intersection point.
In some embodiments, the subunit includes two convex curves or two concave curves. Wherein, the two convex curves of the subunit are symmetrically arranged; or the two concave curves of the subunits are symmetrically arranged.
In some embodiments, the two ends of the subunit are provided with expansion parts, and the expansion parts are formed by connecting curves.
In some embodiments, the expansion comprises two convex curves or two concave curves. Wherein, the two convex curves of the expansion part are symmetrically arranged; alternatively, the two concave curves of the expansion part are symmetrically arranged.
Based on the same inventive concept, the invention also provides a near-eye display device comprising the two-dimensional diffraction optical waveguide. Since the near-eye display device of the present invention includes the two-dimensional diffractive optical waveguide, the near-eye display device of the present invention has similar technical effects to those of the above embodiments, and details are not repeated herein. In addition, for a detailed description of the principles, reference may also be made to the description of the above embodiments, which are not repeated herein.
According to the technical scheme, the near-eye display device provided by the invention adopts the crossed or combined crossed optical structure to perform two-dimensional pupil expansion, so that the waveguide exit pupil has high uniformity, and the image banding phenomenon is weakened, so as to obtain an image with good uniformity; moreover, the optical structure is formed by connecting curves, the curve edge has better experimental tolerance compared with the straight line edge, and the uniformity of the exit pupil can be further improved by adjusting the curvature of the curve.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A two-dimensional outcoupling grating, comprising a plurality of identical optical structures; the optical structure is formed by curve connection;
the optical structures are in a cross shape or a combined cross shape, the optical structures are arranged in an equally-spaced array, and the distances between the graphic center point of each optical structure and the graphic center points of other adjacent optical structures are equal.
2. A two-dimensional outcoupling grating according to claim 1, wherein said optical structure comprises two sub-units of identical shape, said sub-units being formed by curved connections, the two sub-units being arranged crosswise, said two sub-units having only one intersection point.
3. A two-dimensional outcoupling grating according to claim 2, wherein said sub-unit comprises two convex curves, said two convex curves being symmetrically arranged.
4. A two-dimensional outcoupling grating according to claim 3, wherein both ends of said sub-unit are provided with expansions, said expansions being constituted by curved connections.
5. A two-dimensional outcoupling grating according to claim 4, wherein said expansion comprises two convex curves, and wherein said two convex curves of said expansion are symmetrically arranged.
6. A two-dimensional outcoupling grating according to claim 2, wherein said sub-unit comprises two concave curves, said two concave curves being symmetrically arranged.
7. A two-dimensional outcoupling grating according to claim 6, wherein both ends of said sub-unit are provided with expansions, said expansions being constituted by curvilinear connections.
8. A two-dimensional outcoupling grating according to claim 7, wherein said expansion comprises two concave curves, and wherein said two concave curves of said expansion are symmetrically arranged.
9. A two-dimensional outcoupling grating according to any of claims 2 to 8, wherein the angle of intersection of the two subunits is 0 ° -120 °.
10. A two-dimensional diffractive optical waveguide, comprising: a waveguide substrate and a one-dimensional incoupling grating and a two-dimensional outcoupling grating as claimed in any of claims 1 to 9 arranged on a surface of said waveguide substrate;
the one-dimensional coupling grating is used for coupling incident light carrying image information into the waveguide; the two-dimensional coupling grating is used for coupling out the diffracted light which comes from the one-dimensional coupling grating and is conducted in the waveguide in a total reflection mode to human eyes for imaging while diffracting and expanding the diffracted light along two directions.
11. A near-eye display device comprising the two-dimensional diffractive optical waveguide according to claim 10.
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| CN116165803A (en) * | 2023-04-20 | 2023-05-26 | 杭州光粒科技有限公司 | Waveguide display system |
| CN116299816A (en) * | 2023-05-22 | 2023-06-23 | 北京亮亮视野科技有限公司 | Fork-shaped super-surface grating, optical waveguide and near-eye display device for inhibiting high-grade light |
| CN116719169A (en) * | 2023-08-10 | 2023-09-08 | 北京亮亮视野科技有限公司 | Diffraction grating waveguide and augmented reality display device |
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