CN217639770U - Image combiner and AR near-to-eye display optical system - Google Patents
Image combiner and AR near-to-eye display optical system Download PDFInfo
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Abstract
The application provides an image combiner and an AR near-eye display optical system, phase modulation is carried out on part of three primary colors of light rays which are coupled into a light waveguide and enter the off-axis super lens through the off-axis super lens in an achromatic off-axis super lens array arranged in the image combiner, the part of the three primary colors of light rays after the phase modulation are coupled out of the light waveguide and form an image point source which forms an image point source array, so that the image combiner which can be used by the small-hole imaging type near-eye display device is formed, the off-axis super lens is utilized to replace a thicker traditional optical device, and due to the fact that the off-axis super lens has the advantage of being light and thin, the small-hole imaging type near-eye display device is beneficial to being developed in the direction of miniaturization, the three primary colors of light rays which are transmitted in a single light waveguide can be converged outside the light waveguide to form the image point source, and image display of a color image can be achieved without using three light waveguides.
Description
Technical Field
The application relates to the technical field of superlens application, in particular to an image combiner and an AR near-eye display optical system.
Background
Currently, virtual Reality (VR) and Augmented Reality (AR) technologies create a three-dimensional simulated environment with a sense of experience or superimpose Virtual information in a real environment. In addition to the common free-form surface type and waveguide type AR optical systems, the AR apparatus is widely studied for the small-aperture imaging type near-to-eye display device due to its high light energy utilization efficiency and deeper depth of field. However, the optical devices used in the aperture imaging type near-to-eye display device are relatively thick and heavy, which is not favorable for the miniaturization of the aperture imaging type near-to-eye display device.
SUMMERY OF THE UTILITY MODEL
To solve the above problems, it is an object of embodiments of the present application to provide an image combiner and an AR near-eye display optical system.
In a first aspect, an embodiment of the present application provides an image combiner, including: the optical waveguide, the achromatic off-axis superlens array and the coupling-in module;
the achromatic off-axis superlens array comprising: a plurality of off-axis superlenses;
each off-axis superlens in the off-axis superlenses is arranged on the same surface of the optical waveguide at intervals;
the coupling-in module is arranged on the light guide, three primary color light rays for imaging are coupled into the light guide at the same inclination angle, and the coupled three primary color light rays are subjected to total internal reflection in the light guide;
the off-axis super lens performs phase modulation on part of the three-primary-color light rays in the incident three-primary-color light rays, and the part of the three-primary-color light rays after the phase modulation are coupled out of the optical waveguide by the off-axis super lens and form an image point source forming an image point source array;
the image point source is located at the focal point position of the off-axis super lens.
In a second aspect, an embodiment of the present application further provides an AR near-eye display optical system, including: an image display, a relay mirror and the image combiner of the first aspect;
the relay lens projects or enlarges and projects the three primary colors of light rays for imaging emitted by the image display into the image combiner.
In the solutions provided in the first aspect to the second aspect of the embodiment of the present application, by using the off-axis superlens in the achromatic off-axis superlens array disposed in the image combiner, phase-modulating a portion of three primary color light rays incident to the off-axis superlens from among three primary color light rays coupled into the light waveguide, and coupling a portion of the three primary color light rays after phase-modulating out of the light waveguide to form an image point source constituting the image point source array, thereby forming an image combiner that can be used by the small-aperture imaging type near-eye display device, and compared with a manner in which a thicker conventional optical device is used in a small-aperture imaging type near-eye display device in the related art, using the off-axis superlens instead of a thicker conventional optical device can greatly reduce the weight and thickness of the image combiner of the small-aperture imaging type near-eye display device due to the light and thin advantages of the off-axis superlens, which is beneficial to the development of the small-aperture imaging type near-eye display device toward miniaturization, and improves the comfort level of wearing; moreover, the achromatic off-axis super lens array can converge the light rays of three primary colors transmitted in the single optical waveguide outside the optical waveguide to form an image point source, and the image display of a color image can be realized without using three optical waveguides, so that the structure of the image combiner is simpler, and the image combiner is easy to manufacture, popularize and use.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram illustrating an image combiner based on a transmissive off-axis superlens according to an embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a reflective off-axis superlens-based image combiner according to an embodiment of the present application;
FIG. 3 is a schematic diagram of an image combiner in which a second nanostructure, a third nanostructure, and a fourth nanostructure are disposed on a substrate by one of the off-axis superlenses according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of another example of an off-axis superlens in an image combiner configured to dispose a second nanostructure, a third nanostructure, and a fourth nanostructure on a substrate according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram illustrating an operation principle of a transmissive off-axis superlens in an image combiner according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating the operation of a reflective off-axis superlens in an image combiner according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating an off-axis superlens including a plurality of super surface structure units in an image combiner according to an embodiment of the present application;
fig. 8 shows a schematic structural diagram of an AR near-eye display optical system provided in an embodiment of the present application.
Icon: 10. a coupling-in module; 100. an optical waveguide; 200. a transmissive off-axis superlens; 202. a reflective off-axis superlens; 300. a second nanostructure; 302. a third nanostructure; 304. a fourth nanostructure; 306. a substrate; 800. an image display; 802. a relay lens; 804. an image combiner.
Detailed Description
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Currently, VR and AR technologies create a three-dimensional simulated environment with experience or superimpose virtual information in a real environment. In addition to the common free-form surface type and waveguide type AR optical systems, the AR apparatus is widely studied for the small-aperture imaging type near-to-eye display device due to its high light energy utilization efficiency and deeper depth of field. However, the optical device used in the pinhole imaging type near-to-eye display device is relatively thick and heavy, which is not favorable for the development of the pinhole imaging type near-to-eye display device towards miniaturization.
Based on this, the embodiment of the application provides an image combiner and an AR near-eye display optical system, phase modulation is performed on part of three primary color light rays, which are coupled into an optical waveguide, of three primary color light rays coupled into an off-axis superlens through an off-axis superlens in an achromatic off-axis superlens array arranged in the image combiner, and the part of the three primary color light rays after the phase modulation are coupled out of the optical waveguide and form an image point source forming an image point source array, so that an image combiner which can be used by a small-hole imaging near-eye display device is formed; moreover, the achromatic off-axis superlens array can converge the light rays of three primary colors transmitted in the single optical waveguide outside the optical waveguide to form an image point source, and the image display of a color image can be realized without using three optical waveguides.
Before describing the embodiments presented in this application, the following definitions are given:
the three primary colors of light include red, green and blue, and in the visible light band, the wavelength of red light is 632 nm, the wavelength of green light is 532 nm, the wavelength of blue light is 473 nm, and the wavelengths of the red, green and blue light are different from each other. Then in the following embodiments of the present application, the three primary color light rays include: a beam of light having a first wavelength, light having a second wavelength, and light having a third wavelength.
The first wavelength, the second wavelength, and the third wavelength may be any combination of the wavelengths of red light, green light, and blue light, respectively, and are not limited in this embodiment.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and examples.
Examples
The image combiner provided by the embodiment is used for a small-hole imaging type near-eye display device.
Referring to a schematic structural diagram of an image combiner based on a transmissive off-axis superlens shown in fig. 1 and a schematic structural diagram of an image combiner based on a reflective off-axis superlens shown in fig. 2, the present embodiment proposes an image combiner, including: an optical waveguide 100, an achromatic off-axis superlens array and a coupling-in module 10.
The achromatic off-axis superlens array comprises: a plurality of off-axis superlenses.
Each off-axis super lens in the off-axis super lenses is arranged on the same surface of the optical waveguide at intervals.
The coupling-in module is arranged on the light guide, three primary color light rays for imaging are coupled into the light guide at the same inclined angle, and the coupled-in three primary color light rays are subjected to total internal reflection in the light guide.
The off-axis super lens performs phase modulation on part of the incident three-primary-color light rays, and the part of the three-primary-color light rays after the phase modulation are coupled out of the optical waveguide by the off-axis super lens and form an image point source forming an image point source array.
The image point source is located at the focal point position of the off-axis super lens.
In the process of using the image combiner, the imaging light is displayed in the real environment by the image point source array formed by the image point sources formed by converging the three primary colors of light of each part of the three primary colors of light coupling light guide, and the virtual information presented by the imaging light is fused with the real environment, so that the effect of enhancing reality is realized.
The coupling module adopts, but is not limited to: a holographic optical element, a metamaterial grating, a diffraction grating, or a metasurface.
The process of coupling the light rays of three primary colors for imaging into the optical waveguide at the same angle by the super-surface is prior art and is not discussed in the present embodiment.
For phase modulating the light of the three primary colors, the off-axis superlens, comprising: a substrate 306 and a nanostructure disposed on the substrate.
However, the single off-axis superlens is limited in size and number of nanostructures contained therein, and only a portion of the incident light rays of the three primary colors can be phase-modulated. Therefore, the image combiner provided in this embodiment needs to use an achromatic off-axis superlens array including a plurality of off-axis superlenses to perform phase modulation on each of the three primary color light rays coupled into the light guide and couple the light guide, so as to form a plurality of image point sources to form an image point source array, and to fuse virtual information in a real environment.
In this embodiment, the image point source is a point light source for realizing pinhole imaging, and is obtained by coupling a part of three primary color light rays out of the three primary color light rays through the off-axis superlens in a manner of converging or reflecting the part of the three primary color light rays to a focal point position of the off-axis superlens located outside the optical waveguide for imaging.
The off-axis super lens converges part of the three primary color light rays to the same focus position of the off-axis super lens to obtain an image point source, so that the aim of eliminating chromatic aberration is fulfilled.
In order to converge the three primary color light rays outside the optical waveguide to form an image point source, the modulation phase of the nanostructure in the off-axis superlens on the three primary color light rays satisfies the following formulas 1 to 3:
wherein (x, y) represents the position coordinates of the nanostructure relative to the center of the off-axis superlens;
indicating that the nanostructure at the (x, y) position in the off-axis superlens has a wavelength λ in the trichromatic light rays 1 The modulation phase of the light;
representing nanostructures at (x, y) positions in the off-axis superlens for light of a second wavelength λ 2 The modulation phase of the light;
indicating that the nanostructure at the (x, y) position in the off-axis superlens has a third wavelength λ in the three primary color light rays 3 The modulation phase of the light; f represents the focal length of the off-axis superlens; θ represents the tilt angle of the light guide into which the three primary colors of light are coupled.
In one embodiment, the first nanostructure satisfying the above equations 1 to 3 can be directly searched from the nano database, and then, in the image combiner proposed in this embodiment, the nanostructure includes: a first nanostructure.
The first nanostructure can perform phase modulation on light with a first wavelength, light with a second wavelength and light with a third wavelength in three primary colors. The three primary colors of light after phase modulation are respectively coupled out of the optical waveguide, and an image point source forming an image point source array is formed.
In one embodiment, if the difficulty of finding the first nanostructure satisfying the above formulas 1 to 3 from the nano database is high, the difficulty of designing the nanostructure may be reduced, three different nanostructures satisfying the above formulas 1 to 3 are found from the nano database, and the light with the first wavelength, the light with the second wavelength, and the light with the third wavelength of the three primary colors of light are respectively phase-modulated by the three different nanostructures, in the image combiner provided in this embodiment, the nanostructures include: a second nanostructure, a third nanostructure, and a fourth nanostructure.
The second nanostructure is capable of phase modulating the light of the first wavelength of the light of the three primary colors.
The third nanostructure can perform phase modulation on the light with the second wavelength in the light with the three primary colors.
The fourth nanostructure can perform phase modulation on the light with the third wavelength in the light with the three primary colors.
The second, third and fourth nanostructures are nanostructures that differ in shape, period and/or size.
Alternatively, the materials used for the second, third and fourth nanostructures may also be different.
Referring to fig. 3, a schematic diagram of an off-axis superlens structure with a second nanostructure, a third nanostructure, and a fourth nanostructure disposed on a substrate, in the image combiner of the present embodiment, in order to dispose the second nanostructure 300, the third nanostructure 302, and the fourth nanostructure 304 on the substrate, the following method may be adopted: the substrate 306 is divided into a plurality of phase modulation regions.
The second nanostructure, the third nanostructure, or the fourth nanostructure is disposed in each of the plurality of phase modulation regions.
As shown in fig. 3, the substrate is divided into a plurality of sector-shaped phase modulation regions, the first nanostructure is a nanostructure with a square cross section, the second nanostructure is a nanostructure with a triangular cross section, and the third nanostructure is a nanostructure with a circular cross section, and as can be seen from fig. 3, the second nanostructure, the third nanostructure, or the fourth nanostructure is respectively disposed in each phase modulation region.
The division of the substrate into the plurality of fan-shaped phase modulation regions in the structure of the off-axis superlens shown in fig. 3 is only an example, and when the substrate is divided into the plurality of phase modulation regions, the division is not limited to the fan-shaped phase modulation regions, and the substrate may be divided into the plurality of phase modulation regions according to a ring shape or any other shape, which is not described in detail herein.
The cross-sectional shapes of the second nanostructure, the third nanostructure, and the fourth nanostructure in the structure of the off-axis superlens shown in fig. 3 are only examples, and the cross-sectional shapes of the second nanostructure, the third nanostructure, and the fourth nanostructure may also be cross-sectional shapes of any other alternative nanomaterials in a nanomaterial library, and are not repeated here.
Alternatively, referring to another structural schematic diagram of the off-axis superlens shown in fig. 4, in which the second nanostructure, the third nanostructure, and the fourth nanostructure are disposed on the substrate, in the image combiner provided in this embodiment, in order to dispose the second nanostructure 300, the third nanostructure 302, and the fourth nanostructure 304 on the substrate, the following manner may be adopted: the second nanostructure, the third nanostructure, and the fourth nanostructure are alternately disposed on the substrate.
After the nanostructure meeting the requirements of the above formulas 1 to 3 is obtained, a converging manner may be adopted to couple out part of the three primary color light rays to the same focal position of the off-axis superlens outside the optical waveguide, so as to form an image point source constituting an image point source array.
The transmissive off-axis superlens converges light rays with a first wavelength, light rays with a second wavelength and light rays with a third wavelength of the incident three primary color light rays to a focal position of the transmissive off-axis superlens.
As shown in fig. 1, the transmissive off-axis superlens is disposed on the same surface of the optical waveguide as the coupling-in module.
The transmission type off-axis super lens performs phase modulation on part of the incident three-primary-color light rays, and the part of the three-primary-color light rays after phase modulation are converged outside the optical waveguide by the transmission type off-axis super lens to obtain an image point source of the part of the three-primary-color light rays.
The transmission type off-axis super lens is used for carrying out phase modulation on part of the three primary color light rays of the incident three primary color light rays, so that the part of the three primary color light rays after the phase modulation no longer meets the propagation condition of total reflection in the optical waveguide, but is converged outside the optical waveguide by the transmission type off-axis super lens, and the part of the three primary color light rays in the three primary color light rays are coupled out of the optical waveguide to form an image point source.
Optionally, a reflection mode may also be adopted, so that part of the three primary color light rays in the three primary color light rays are coupled out to the same focal position of the off-axis superlens outside the optical waveguide, so as to form an image point source constituting an image point source array, see the schematic operating principle diagram of the reflection off-axis superlens shown in fig. 6, in the image combiner provided in this embodiment, the reflection off-axis superlens 202 is adopted as the off-axis superlens.
As shown in fig. 2, the reflective off-axis superlens is disposed on a surface of the optical waveguide on a side away from the coupling-in module.
The reflective off-axis super lens performs phase modulation on part of the incident three-primary-color light rays, and the part of the three-primary-color light rays after phase modulation are reflected to the outside of the optical waveguide by the reflective off-axis super lens to obtain an image point source of the part of the three-primary-color light rays.
The reflection type off-axis super lens is used for carrying out phase modulation on part of the incident three-primary-color light rays, so that the part of the three-primary-color light rays after phase modulation no longer meets the propagation condition of total reflection in the optical waveguide, but is reflected to the outside of the optical waveguide by the reflection type off-axis super lens, and the part of the three-primary-color light rays in the three-primary-color light rays are coupled out of the optical waveguide to form an image point source.
In order to ensure that the part of the three primary color light rays after phase modulation is reflected to the outside of the optical waveguide by the reflective off-axis superlens, the focal length of the reflective off-axis superlens should be larger than the thickness of the optical waveguide.
Specifically, in order to realize the function of the reflective off-axis superlens, in the image combiner provided in this embodiment, in addition to the substrate and the nanostructure, the reflective off-axis superlens further includes: a metal reflective film layer and a dielectric film layer.
The metal reflecting film layer covers the substrate, the dielectric film layer covers the metal reflecting film layer, and the nano structure is arranged on the dielectric film layer.
The medium film layer can transmit light rays in a visible light wave band.
Wherein the thickness of the metal reflecting film layer is between 30 nanometers and 3000 nanometers.
The thickness of the dielectric film layer arranged on the metal reflecting film is between 100 nanometers and 1000 nanometers, and the manufacturing materials of the dielectric film layer include but are not limited to: silicon nitride, titanium oxide, silicon oxide, and aluminum oxide.
When the achromatic off-axis super lens array comprises n off-axis super lenses, in order to ensure that the light output amounts of the n off-axis super lenses are the same, human eyes see the uniformity of image brightness, the arranged nano structures in each off-axis super lens in the n off-axis super lenses are the same in arrangement mode and the number of the nano structures is the same, and therefore the light output amount of each off-axis super lens in the n off-axis super lenses is 1/n of the whole light output amount.
Referring to fig. 7, a schematic diagram of an off-axis superlens including a plurality of super-surface structure units, each super-surface structure unit being capable of modulating incident light, and a nano-structure being capable of directly adjusting and controlling characteristics of light, such as phase; in this embodiment, the nanostructure is an all-dielectric structural unit having high transmittance at least in the visible light band, and the selectable materials include: titanium oxide, silicon nitride, fused silica, aluminum oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, and the like. The nano structures are arranged in an array, so that super surface structure units can be divided; the super-surface structure unit can be a regular hexagon, a square, a fan and the like, and a nano structure is respectively arranged at the central position of each super-surface structure unit or the central position and the vertex position of each super-surface structure unit. All the nanostructures may be located on the same side of the flexible curved-surface transparent substrate, or a part of the nanostructures is located on one side of the flexible curved-surface transparent substrate, and another part of the nanostructures is located on the other side of the flexible curved-surface transparent substrate, which is not limited in this embodiment.
It should be noted that, the substrate of the off-axis superlens is an integral layer structure, and the multiple super-surface structure units in the off-axis superlens may be artificially divided, that is, multiple nanostructures are disposed on the substrate, so that a super-surface structure unit including one or more nanostructures may be divided, or the multiple super-surface structure units may form an off-axis superlens of an integral structure.
After the description of the image combiner proposed in the present embodiment is completed by the above, the description of the AR near-eye display optical system proposed in the present embodiment is continued by the following.
Referring to a schematic structural diagram of an AR near-eye display optical system shown in fig. 8, the AR near-eye display optical system provided in this embodiment is an implementation manner of a small-aperture imaging near-eye display device, and the AR near-eye display optical system includes: an image display 800, a relay lens 802, and the image combiner 804 described above.
The relay lens projects or enlarges and projects the three primary colors of light rays for imaging emitted by the image display into the image combiner.
In one embodiment, the relay lens is a turning prism or a superlens.
The way of projecting or magnifying the incident light by the superlens is prior art and is not within the scope of the present embodiment.
In one embodiment, the image display uses a mems-based laser beam scanning display.
As shown in fig. 8, the AR near-eye display optical system is exemplified by AR glasses, the image display and the relay lens are disposed on the same temple of the AR glasses, and the image combiner is integrally disposed with lenses of the AR glasses. The image combiner presents the obtained three primary colors of light rays for imaging to a real environment in an image point source array mode, and fuses virtual information presented by the imaging light rays with the real environment to achieve the effect of augmented reality.
The AR glasses shown in fig. 8 are only an example of an AR near-eye display optical system, and many other implementations of the AR near-eye display optical system exist, and are not described in detail here.
An aperture imaging near-eye display device is constructed using a coupling-out device having an achromatic off-axis superlens array as a waveguide image combiner. The achromatic off-axis super lens array is thin, so that the AR near-eye display optical system comprising the achromatic off-axis super lens array is thin as a whole, and the wearing comfort level is improved; moreover, the achromatic off-axis superlens array is adopted, three layers of waveguides are not needed, the overall structure is simpler, and the mass production cost is lower.
In summary, the present embodiment provides an image combiner and an AR near-eye display optical system, where a portion of three-primary-color light rays, which are coupled into a light waveguide, of three-primary-color light rays incident into an off-axis superlens are phase-modulated by an off-axis superlens in an achromatic off-axis superlens array disposed in the image combiner, and the phase-modulated portion of the three-primary-color light rays are coupled out of the light waveguide and form an image point source constituting an image point source array, so as to form an image combiner that can be used by a small-aperture imaging near-eye display device, and compared with a manner in which a thicker conventional optical device is used in a small-aperture imaging near-eye display device in the related art, the off-axis superlens replaces a thicker conventional optical device, and due to the light and thin advantages of the off-axis superlens, the weight and thickness of the image combiner of the small-aperture imaging near-eye display device can be greatly reduced, which is beneficial to the development of the small-aperture imaging near-eye display device toward miniaturization, and improves the wearing comfort; moreover, the achromatic off-axis superlens array can converge the three-primary-color light rays transmitted in the single optical waveguide to the outside of the optical waveguide to form an image point source, and the image display of a color image can be realized without using three optical waveguides, so that the structure of the image combiner is simpler, and the image combiner is easy to manufacture, popularize and use.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (14)
1. An image combiner, comprising: the optical waveguide, the achromatic off-axis superlens array and the coupling-in module;
the achromatic off-axis superlens array comprising: a plurality of off-axis superlenses;
each off-axis superlens in the off-axis superlenses is arranged on the same surface of the optical waveguide at intervals;
the coupling-in module is arranged on the light guide, three primary color light rays for imaging are coupled into the light guide at the same inclination angle, and the coupled three primary color light rays are subjected to total internal reflection in the light guide;
the off-axis super lens performs phase modulation on part of the three-primary-color light rays in the incident three-primary-color light rays, and the part of the three-primary-color light rays after the phase modulation are coupled out of the optical waveguide by the off-axis super lens and form an image point source forming an image point source array;
the image point source is located at the focal point position of the off-axis super lens.
2. The image combiner of claim 1, wherein the off-axis superlens comprises: a substrate and a nanostructure disposed on the substrate.
3. The image combiner of claim 2, wherein the phase of modulation of the three primary color light rays by the nanostructures in the off-axis superlens satisfies the following equations 1 to 3:
wherein (x, y) represents the position coordinates of the nanostructure relative to the center of the off-axis superlens;
representing nanostructures at (x, y) positions in an off-axis superlens for light of a first wavelength λ 1 The modulation phase of the light;
representing nanostructures at (x, y) positions in the off-axis superlens for light of a second wavelength λ 2 The modulation phase of the light;
indicating that the nanostructure at the (x, y) position in the off-axis superlens has a third wavelength λ in the three primary color light rays 3 The modulation phase of the light; f represents the focal length of the off-axis superlens; θ represents the tilt angle of the light guide into which the three primary colors of light are coupled.
4. The image combiner of claim 3, wherein the nanostructures comprise: a first nanostructure;
the first nanostructure can perform phase modulation on light with a first wavelength, light with a second wavelength and light with a third wavelength in three primary colors.
5. The image combiner of claim 3, wherein the nanostructures comprise: a second nanostructure, a third nanostructure, and a fourth nanostructure;
the second nanostructure can perform phase modulation on the light with the first wavelength in the light with the three primary colors;
the third nanostructure can perform phase modulation on the light with the second wavelength in the light with the three primary colors;
the fourth nanostructure can perform phase modulation on the light with the third wavelength in the light with the three primary colors;
the second, third and fourth nanostructures are nanostructures that differ in shape, period and/or size.
6. The image combiner of claim 5, wherein the substrate is divided into a plurality of phase modulation regions;
the second nanostructure, the third nanostructure, or the fourth nanostructure is disposed in each of the plurality of phase modulation regions.
7. The image combiner of claim 5, wherein the second, third, and fourth nanostructures are disposed in an alternating pattern on the substrate.
8. The image combiner of any of claims 2-7, wherein the off-axis superlens is a transmissive off-axis superlens;
the transmission type off-axis super lens and the coupling-in module are arranged on the same surface of the optical waveguide;
the transmission type off-axis super lens performs phase modulation on part of the incident three-primary-color light rays, and the part of the three-primary-color light rays after phase modulation are converged outside the optical waveguide by the transmission type off-axis super lens to obtain an image point source of the part of the three-primary-color light rays.
9. The image combiner of any of claims 2-7, wherein the off-axis superlens is a reflective off-axis superlens;
the reflective off-axis super lens is arranged on the surface of one side of the optical waveguide far away from the coupling-in module;
the reflective off-axis super lens performs phase modulation on part of the incident three-primary-color light rays, and the part of the three-primary-color light rays after phase modulation are reflected to the outside of the optical waveguide by the reflective off-axis super lens to obtain an image point source of the part of the three-primary-color light rays.
10. The image combiner of claim 9, wherein the reflective off-axis superlens further comprises: a metal reflective film layer and a dielectric film layer;
the metal reflecting film layer covers the substrate, the dielectric film layer covers the metal reflecting film layer, and the nano structure is arranged on the dielectric film layer;
the medium film layer can transmit light rays in a visible light wave band.
11. The image combiner of claim 1, wherein the coupling module employs a holographic optical element, a metamorphic grating, a diffraction grating, or a metasurface.
12. An AR near-eye display optical system, comprising: an image display, a relay, and the image combiner of any of claims 1-11;
the relay lens projects or enlarges and projects the three primary colors of light rays for imaging emitted by the image display into the image combiner.
13. The AR near-eye display optical system of claim 12, wherein the relay lens is a turning prism or a superlens.
14. The AR near-eye display optical system of claim 12, wherein the image display employs a mems-based laser beam scanning display.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116088086A (en) * | 2023-03-02 | 2023-05-09 | 福州京东方光电科技有限公司 | Optical waveguide and near-to-eye display device |
| CN117031757A (en) * | 2023-08-16 | 2023-11-10 | 天津大学四川创新研究院 | Superlens optical machine device for augmented reality display and operation method thereof |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
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2022
- 2022-07-11 CN CN202221772737.1U patent/CN217639770U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11978752B2 (en) | 2019-07-26 | 2024-05-07 | Metalenz, Inc. | Aperture-metasurface and hybrid refractive-metasurface imaging systems |
| US11927769B2 (en) | 2022-03-31 | 2024-03-12 | Metalenz, Inc. | Polarization sorting metasurface microlens array device |
| CN116088086A (en) * | 2023-03-02 | 2023-05-09 | 福州京东方光电科技有限公司 | Optical waveguide and near-to-eye display device |
| CN117031757A (en) * | 2023-08-16 | 2023-11-10 | 天津大学四川创新研究院 | Superlens optical machine device for augmented reality display and operation method thereof |
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