WO2020248539A1 - Nanowaveguide lens, three-dimensional display device, and eyeglasses - Google Patents

Abstract

A nanowaveguide lens (10) comprises a plate waveguide body (11), a coupling-in region (11a) and a coupling-out region (11b) provided on the plate waveguide body (11), and multiple structural unit pixels (12) provided within both the coupling-in region (11a) and the coupling-out region (11b). The structural unit pixels (12) comprise a first structural sub-unit (12a), a second structural sub-unit (12b), and a third structural sub-unit (12c). When image light is incident on the coupling-in region (11a), red light enters the plate waveguide body (11) via the first structural sub-unit (12a), undergoes total internal reflection in the plate waveguide body (11), reaches the coupling-out region (11b), and is emitted from the first structural sub-unit (12a) of the coupling-out region (11b). Blue light enters the plate waveguide body (11) via the second structural sub-unit (12b), undergoes total internal reflection in the plate waveguide body (11), reaches the coupling-out region (11b), and is emitted from the second structural sub-unit (12b) of the coupling-out region (11b). Green light enters the plate waveguide body (11) via the third structural sub-unit (12c), undergoes total internal reflection in the plate waveguide body (11), reaches the coupling-out region (11b), and is emitted from the third structural sub-unit (12c) of the coupling-out region (11b). The structural sub-units (12a, 12b, 12c) of the nanowaveguide lens are configured in a spatial multiplexing manner, thereby achieving color display without separating colors by multiple layers of waveguides. Further provided are a three-dimensional display device (20) and eyeglasses (30).

Description

Nano waveguide lens, three-dimensional display device and glasses

This application claims the priority of the Chinese patent application whose application date is June 13, 2019 and the application number is 201910512593.2, the entire content of which is incorporated into this application by reference.

Technical field

The invention relates to the field of color display technology, in particular to a nano-waveguide lens, a three-dimensional display device and glasses.

Background technique

Augmented reality technology is a new technology that "seamlessly" integrates real world information and virtual world information. It not only displays real world information, but also displays virtual information at the same time. The two types of information complement and overlap each other. In visual augmented reality, users can use the helmet-mounted display to re-synthesize the real world with computer graphics, and then they can see the real world surrounding it. With the development of virtual reality and augmented reality technologies, near-eye display devices have been rapidly developed, and methods that use traditional optical elements to couple image light into the human eye have been adopted, including the use of prisms, mirrors, and free-form surfaces. For example, the prisms used in Google Glass are generally about 10 mm thick, and the field of view is only 15°. After wearing glasses, people often only see a very compact image; Epson’s free-form surface prisms, and Meta’s half-reverse half Although the transparent curved surface solution has a large field of view, the volume and thickness are still difficult to reduce, and the picture effect and permeability are also average, and it is difficult to produce a good AR perspective visual effect.

At present, most mainstream near-eye augmented reality display devices adopt the principle of optical waveguide. For example, Hololens couples the image light emitted by the projection module to the waveguide through a coupling grating. The light is bent and conducted in the optical waveguide. The self-coupling grating is coupled to the human eye. The geometric superposition of three optical waveguide lenses is used to achieve Color display. Lumus realizes AR display through the design of array grating. Its display has a pupil dilation effect, but there is a shutter effect, which affects the viewing experience. Therefore, the current mainstream display solutions cannot achieve a light and thin display unit while achieving a good display effect.

Summary of the invention

In view of this, the present invention provides a nano-waveguide lens, which adopts spatial multiplexing mode to allocate structural subunits, and does not need to use double-layer or even multi-layer waveguides to separate and guide light to achieve color.

A nano waveguide lens includes a waveguide sheet body. The surface of the waveguide sheet body is provided with a coupling-in area and a coupling-out area. Both the coupling-in area and the coupling-out area are provided with a plurality of structural unit pixels, and each structural unit pixel includes a first Structural subunit, second structural subunit and third structural subunit; when image light is incident on the coupling area, red light can enter the body of the waveguide from the first structural subunit of the coupling area, but blue and green light cannot From the first structure subunit into the body of the waveguide sheet, the red light is totally reflected in the body of the waveguide sheet to the coupling out area, and is emitted from the first structure subunit of the coupling out area; blue light can be emitted from the second structure subunit of the coupling area When the unit enters the body of the waveguide sheet, the red and green light cannot enter the body of the waveguide sheet from the second structure subunit. The blue light is totally reflected in the waveguide sheet body to the coupling-out area, and can pass from the second structure sub-unit of the coupling-out area Emitted; green light can enter the body of the waveguide sheet from the third structure subunit of the coupling area, blue and red light cannot enter the body of the waveguide sheet from the third structure subunit of the coupling area, and green light is inside the waveguide sheet body The total reflection is to the coupling-out area and can be emitted from the third structure subunit of the coupling-out area.

In an embodiment of the present invention, the above-mentioned first structure subunit includes a plurality of first diffraction gratings, the second structure subunit includes a plurality of second diffraction gratings, and the third structure subunit includes a plurality of third diffraction gratings.

In the embodiment of the present invention, the period of the first diffraction grating matches the wavelength of red light; the period of the second diffraction grating matches the wavelength of blue light; the period of the third diffraction grating matches the wavelength of green light.

In the embodiment of the present invention, each of the above-mentioned first diffraction gratings is arranged obliquely; each of the second diffraction gratings is arranged obliquely; each of the third diffraction gratings is arranged obliquely.

In an embodiment of the present invention, the size of each of the structural unit pixels described above is 5 to 200 μm.

In an embodiment of the present invention, the above-mentioned waveguide sheet body has a single-layer structure.

The present invention also provides a three-dimensional display device, including the above-mentioned nano-waveguide lens.

In an embodiment of the present invention, the above-mentioned three-dimensional display device further includes a display device and a lens, the display device is located above the nanowaveguide lens, and the lens is arranged between the display device and the nanowaveguide lens. The image light enters the coupling area of the nano-waveguide lens after passing through the lens.

The present invention also provides a pair of glasses, including the above-mentioned nano-waveguide lens.

In an embodiment of the present invention, the above-mentioned glasses further include a frame and a temple, one end of the temple is connected to the frame, the frame is provided with two nano-waveguide lenses, and two nano-waveguide lenses have coupling-out regions Set corresponding to the human eye.

The surface of the waveguide sheet body of the nano-waveguide lens of the present invention is provided with a coupling-in area and a coupling-out area. Both the coupling-in area and the coupling-out area are provided with a plurality of structural unit pixels, and each structural unit pixel includes a first structural sub-unit , The second structure subunit and the third structure subunit; when the image light enters the coupling area, the red light can enter the waveguide body from the first structure subunit of the coupling area, and the blue and green light cannot pass from the first structure subunit. The structure subunit enters the body of the waveguide sheet, and the red light is totally reflected in the body of the waveguide sheet to the coupling out area, and is emitted from the first structure subunit of the coupling out area; blue light can enter the waveguide from the second structure subunit of the coupling area In the film body, red light and green light cannot enter the waveguide film body from the second structural subunit. Blue light is totally reflected in the waveguide film body to the coupling-out area, and can be emitted from the second structural subunit of the coupling-out area; green Light can enter the body of the waveguide sheet from the third structural subunit of the coupling area, and blue and red light cannot enter the body of the waveguide sheet from the third structural subunit of the coupling area. The green light is totally reflected in the waveguide sheet body. The coupling-out area can be emitted from the third structure subunit of the coupling-out area. The nano-waveguide lens of the present invention does not need to use a complicated waveguide structure, and uses spatial multiplexing to allocate structural sub-units, and does not need to use double-layer or even multi-layer waveguides to separate color and guide light to achieve color. It is more in terms of preparation process and technical cost. Advantage.

Description of the drawings

Fig. 1 is a schematic top view of the nano-waveguide lens of the present invention.

FIG. 2 is a schematic cross-sectional view of the nano-waveguide lens shown in FIG. 1.

3a to 3c are schematic diagrams of the arrangement state of the structural unit pixels of the present invention on the body of the waveguide sheet.

4 is a schematic diagram of the structure of the three-dimensional display device of the present invention.

Fig. 5 is a schematic diagram of the structure of the glasses of the present invention.

FIG. 6 is a schematic diagram of the structure of the augmented reality display device of the present invention.

FIG. 7 is a schematic diagram of the structure of the micro-projection system during operation of the fourth embodiment of the present invention.

FIG. 8 is a schematic diagram of the structure of the micro-projection system in operation of the fifth embodiment of the present invention.

FIG. 9 is a schematic diagram of the structure of a nano-waveguide lens according to a sixth embodiment of the present invention.

FIG. 10 is a schematic diagram of the structure of the augmented reality glasses of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

First embodiment

Fig. 1 is a schematic top view of the nano-waveguide lens of the present invention. FIG. 2 is a schematic cross-sectional view of the nano-waveguide lens shown in FIG. 1. As shown in FIGS. 1 and 2, the nano-waveguide lens 10 includes a waveguide sheet body 11. The surface of the waveguide sheet body 11 is provided with a coupling-in area 11a and a coupling-out area 11b. The waveguide sheet body 11 has a first surface 101 and a second surface 102 opposite to each other. On the first surface 101 or the second surface 102, preferably, the first surface 101 of the waveguide sheet body 11 is provided with a coupling-in area 11a and a coupling-out area. 11b, and the coupling-in area 11a and the coupling-out area 11b are spaced apart from each other. Each of the coupling-in area 11a and the coupling-out area 11b is provided with a plurality of structural unit pixels 12, and each structural unit pixel 12 includes a first structural subunit 12a, a second structural subunit 12b, and a third structural subunit 12c. In this embodiment, the shape of the coupling-in area 11a and the coupling-out area 11b is a circle, a rectangle, or a cone, but it is not limited thereto.

Further, the first structural subunit 12a includes a plurality of first diffraction gratings 121, and the period of the first diffraction gratings 121 matches the wavelength of the red light. The second structure subunit 12b includes a plurality of second diffraction gratings 122, and the period of the second diffraction gratings 122 matches the wavelength of blue light. The third structural subunit 12c includes a plurality of third diffraction gratings 123, and the period of the third diffraction gratings 123 matches the wavelength of the green light. In this embodiment, the periods and orientation angles of the first diffraction grating 121, the second diffraction grating 122, and the third diffraction grating 123 satisfy the grating equation, and specifically satisfy the equations (1) and (2):

tanψ=sinφ/(cosφ-n sinθ ₁ (Λ/λ)) (1)

Among them, ψ represents the azimuth angle of diffracted light; φ represents the orientation angle of the diffraction grating; θ ₁ represents the incident angle of incident light; Λ represents the period of the diffraction grating; λ represents the wavelength of incident light; n represents the refractive index of the diffraction grating;

sin ² (θ ₂ )=(λ/Λ) ² +(n sinθ ₁ ) ² +2n sinθ ₁ cosφ(λ/Λ) (2)

Here, θ ₂ represents the diffraction angle of diffracted light.

After specifying the incident light wavelength, incident angle, and diffracted light diffraction angle and diffraction azimuth, the required first diffraction grating 121, second diffraction grating 122 and third diffraction grating 123 can be calculated by the above two formulas. For the specific calculation process of period and orientation angle, please refer to the prior art, which will not be repeated here.

When image light enters the coupling area 11a, red light can enter the waveguide sheet body 11 from the first structure subunit 12a of the coupling area 11a, and blue and green light cannot enter the waveguide sheet body 11 from the first structure subunit 12a Inside, the red light is totally reflected in the waveguide sheet body 11 to the coupling-out area 11b, and is emitted from the first structural subunit 12a of the coupling-out area 11b;

Blue light can enter the waveguide sheet body 11 from the second structure subunit 12b of the coupling region 11a, red light and green light cannot enter the waveguide sheet body 11 from the second structure subunit 12b, and blue light is totally reflected in the waveguide sheet body 11. To the out-coupling area 11b, and can be emitted from the second structure subunit 12b in the out-coupling area 11b;

Green light can enter the waveguide body 11 from the third structure subunit 12c of the coupling area 11a, blue light and red light cannot enter the waveguide body 11 from the third structure subunit 12c of the coupling area 11a, and green light is in the waveguide The inside of the sheet body 11 is totally reflected to the outcoupling area 11b, and can be emitted from the third structural subunit 12c of the outcoupling area 11b. When red light, blue light and green light are emitted and coupled from the outcoupling area 11b to form a color image.

3a to 3c are schematic diagrams of the arrangement state of the structural unit pixels of the present invention on the body of the waveguide sheet. As shown in FIGS. 3a to 3c, each first diffraction grating 121 is arranged obliquely; each second diffraction grating 122 is arranged obliquely; each third diffraction grating 123 is arranged obliquely, and the first diffraction grating 121, the second diffraction grating 122 and the The tilt directions of the three diffraction gratings 123 are the same. The tilted diffraction gratings are selective to wavelength, avoid dispersion, and have higher diffraction efficiency for a certain wavelength band. For example, red light can be coupled into the first structural subunit 12a of the region 11a. When entering the waveguide sheet body 11, blue light can enter the waveguide sheet body 11 from the second structure subunit 12b of the coupling region 11a, and green light can enter the waveguide sheet body 11 from the third structure subunit 12c of the coupling region 11a. In this embodiment, the first diffraction grating 121, the second diffraction grating 122, and the third diffraction grating 123 can be prepared by holographic interference technology, photolithography technology or nanoimprint technology, and can be freely selected according to actual needs.

The arrangement positions of the first structural subunit 12a, the second structural subunit 12b, and the third structural subunit 12c of each structural unit pixel 12 can be freely selected according to actual needs to ensure that the first diffraction grating 121, the second diffraction grating 122 and the The third diffraction grating 123 may be in an inclined state. For example, the first structure subunit 12a, the second structure subunit 12b, and the third structure subunit 12c are sequentially arranged along the length direction or the width direction of the waveguide sheet body 11, as shown in FIG. 3a. For example, the first structural subunit 12a is arranged in sequence along the length direction or the width direction of the waveguide sheet body 11, the second structural subunit 12b and the third structural subunit 12c are located on one side of the first structural subunit 12a, and the second The structural subunit 12b and the third structural subunit 12c are sequentially arranged along the length direction or the width direction of the waveguide sheet body 11, as shown in FIG. 3b. For example: the first structural subunit 12a is arranged between the second structural subunit 12b and the third structural subunit 12c, the second structural subunit 12b, the first structural subunit 12a, and the third structural subunit 12c are arranged obliquely in sequence , As shown in Figure 3c.

Further, the size of each structural unit pixel 12 is 5 to 200 μm.

Further, the waveguide sheet body 11 has a single-layer structure, and when the color image light passes through the coupling area 11a, monochromatic light of red, blue, and green light enters the waveguide 11, and the red, blue, and green lights are in the single-layer waveguide sheet. Total reflection occurs in the main body 11, and the light does not interfere with each other, and the red light, blue light and green light are output-coupled from the out-coupling area 11b to form a color image. The coupling-in area 11a and the coupling-out area 11b of the waveguide sheet body 11 are respectively provided with a plurality of structural unit pixels 12 that diffract red light, blue light and green light respectively, and make full use of space resources to pass through multiple structural sub-units on a single layer lens Realize the orderly transmission of light in multiple bands. Without adding lenses, the volume and quality of the display system or device can be greatly reduced, which has obvious advantages in lightness and thinness.

Second embodiment

The present invention also relates to a three-dimensional display device. The three-dimensional display device includes the aforementioned nano-waveguide lens 10.

4 is a schematic diagram of the structure of the three-dimensional display device of the present invention. As shown in FIG. 4, the three-dimensional display device 20 further includes a display device 21 and a lens 22. The display device 21 is located above the nanowaveguide lens 10, the lens 22 is arranged between the display device 21 and the nanowaveguide lens 10, and the image light emitted by the display device 21 enters the coupling area 11a of the nanowaveguide lens 10 after passing through the lens 22.

The third embodiment

The present invention also relates to a kind of glasses, which includes the above-mentioned nano-waveguide lens 10.

Fig. 5 is a schematic diagram of the structure of the glasses of the present invention. As shown in FIG. 5, the glasses 30 further include a frame 31 and temples 32. One end of the temple 32 is connected to the mirror frame 31. Two nano-waveguide lenses 10 are provided on the mirror frame 31. The coupling-out areas 11b of the two nano-waveguide lenses 10 are corresponding to human eyes, and the coupling area 11a is corresponding to the temples 32. . In this embodiment, the end of the temple 32 connected to the frame 31 is provided with a accommodating cavity, the accommodating cavity is directly opposite to the coupling area 11a of the nanowaveguide lens 10, and a display screen (not shown) is installed in the accommodating cavity ) And DMD digital micromirror array (not shown). The display screen emits image light, which is focused by the lens group, and the image light is coupled to the coupling area 11a of the waveguide sheet body 11, and passes through the first structural subunit 12a, the second structural subunit 12b, and the third structural subunit of each structural unit pixel 12 The unit 12c is transmitted to the coupling-out area 11b and output from the coupling-out area 11b to the human eye. The human eye receives the coupled image light from the nano-waveguide lens 10 and uses binocular parallax to realize three-dimensional color display.

Fourth embodiment

The present invention also relates to an augmented reality display device. The augmented reality display device includes the aforementioned nano-waveguide lens 10.

FIG. 6 is a schematic diagram of the structure of the augmented reality display device of the present invention. As shown in FIG. 6, the augmented reality display device 40 includes a micro-projection system 42 and a nano-waveguide lens 10. The micro-projection system 42 is arranged above the nano-waveguide lens 10. The micro-projection system 42 includes a light source 421 and a functional film 422 made of photoresist. The functional film 422 is provided with a nanostructure for focusing and imaging, and the light emitted by the light source passes through the function The film 422 is focused and imaged, and the image light is output by the nano-waveguide lens 10.

Further, the light source of the micro-projection system 42 can be selected from a liquid crystal projector (Liquid Crystal on Silicon; LCOS), a projector (Digital Light Procession; DLP), a liquid crystal display (Liquid Crystal Display; LCD), and a light emitting diode (LED). one.

Further, the nano-waveguide lens 10 may have a single-layer structure as described in the first embodiment, but is not limited to this. The nano-waveguide lens 10 may also have a multilayer structure. Preferably, the nanowaveguide lens 10 includes three waveguides. Sheet body 12, three waveguide sheet bodies 12 are stacked, the surface of the upper waveguide sheet body 12 is provided with a plurality of first structure subunits 12a, and the surface of the middle layer waveguide sheet body 12 is provided with a plurality of second structure subunits 12b , The surface of the lower waveguide sheet body 12 is provided with a plurality of third structural subunits 12c. For the structure and function of the first structural subunit 12a, the second structural subunit 12b, and the third structural subunit 12c, please refer to the first implementation For example, I won’t repeat them here. The refractive index of the nano-waveguide lens 10 is 1.3-2.2.

In this embodiment, the functional film 422 is a Finier lens, and the imaging function of multiple lenses can be realized only by the functional film 422, which reduces the volume and weight of the micro-projection system 42 and improves user comfort.

FIG. 7 is a schematic diagram of the structure of the micro-projection system during operation of the fourth embodiment of the present invention. As shown in Figure 7, the nanostructure on the surface of the functional film 422 is composed of a series of zigzag grooves. The surface of the central area of the functional film 422 is an elliptical arc. From the central area of the functional film 422 to the edge direction, the grooves The angles are different, but each groove concentrates the light in one place to form a central focal point. Each groove can be regarded as an independent small lens to adjust the light into a flat light or a concentrated light. These grooves are all made by photolithography. The nanostructures produced by technology, therefore, the scale of the nanostructures can be nanometers, which can greatly compress the volume and weight of the micro-projection system 42.

Fifth embodiment

FIG. 8 is a schematic diagram of the structure of the micro-projection system in operation of the fifth embodiment of the present invention. As shown in FIG. 8, the structure of the augmented reality display device 40 of this embodiment is substantially the same as the structure of the augmented reality display device 40 of the fourth embodiment. The difference lies in the structure of the micro-projection system 42. In this embodiment, the functional film 422 is a nano-brick, and the imaging function of multiple lenses can be realized only by the functional film 422, which reduces the volume and weight of the micro-projection system 42 and improves user comfort.

As shown in Figure 8, the surface of the functional film 422 is randomly arranged with a plurality of nano-tiles, so that the functional film 422 can realize the optical focusing function of the geometric lens on the plane. These nano-tiles are all nanostructures made by photolithography technology. Therefore, the scale of the nanostructure can be at the nanometer level, which can greatly compress the volume and weight of the micro-projection system 42.

Sixth embodiment

FIG. 9 is a schematic diagram of the structure of the nano-waveguide lens of the sixth embodiment of the present invention. As shown in FIG. 9, the structure of the augmented reality display device 40 of this embodiment is substantially the same as the structure of the augmented reality display device 40 of the fourth embodiment. The difference lies in the structure of the nano-waveguide lens 10.

Specifically, as shown in FIG. 9, the surface of the waveguide sheet body 11 is further provided with a turning area 11c, and a plurality of structural unit pixels 12 are arranged in the turning area 11c. Each structural unit pixel 12 includes a first structural sub-unit 12a and a second structural sub-unit 12a. For the structural subunit 12b and the third structural subunit 12c, please refer to the first embodiment for the function and role of the structural unit pixel 12, and will not be repeated here. When the image light enters the coupling-in area 11a, the image light is totally reflected in the waveguide sheet body 11 to the turning area 11c, and the turning area 11c changes the propagation direction of the image light, so that the image light after the changed direction is totally reflected to the coupling-out area 11b . In this embodiment, the light emitted by the micro-projection system 42 enters the nano-waveguide lens 10, and the light exits the human eye after being bent. The user can see the displayed image at a certain position through the nano-waveguide lens 10. Fusion of virtual and real. The turning area 11c of the nanowaveguide lens 10 changes the propagation direction of light, expands the viewing angle range, and can better meet the needs of users.

Seventh embodiment

The present invention also relates to an augmented reality glasses, which includes the above-mentioned augmented reality display device 40.

FIG. 10 is a schematic diagram of the structure of the augmented reality glasses of the present invention. As shown in FIG. 10, the augmented reality glasses 50 further includes a frame 51 and a support leg 52. One end of the support leg 52 is connected to the frame 51. The frame 51 is provided with two nano-waveguide lenses 10, and the support leg 52 is provided with a micro-projector. System 42. In this embodiment, the two independent left and right micro-projection systems 42 output different parallax images, thereby realizing stereoscopic three-dimensional display.

The surface of the waveguide sheet body 11 of the nano-waveguide lens 10 of the present invention is provided with a coupling-in area 11a and a coupling-out area 11b. Both the coupling-in area 11a and the coupling-out area 11b are provided with a plurality of structural unit pixels 12, and each structural unit pixel 12 includes a first structure subunit 12a, a second structure subunit 12b, and a third structure subunit 12c; when image light is incident on the coupling area 11a, red light can enter from the first structure subunit 12a of the coupling area 11a In the waveguide sheet body 11, blue and green light cannot enter the waveguide sheet body 11 from the first structural subunit 12a. The red light is totally reflected in the waveguide sheet body 11 to the out-coupling area 11b, and from the first out-coupling area 11b. The structural subunit 12a emits; the blue light can enter the waveguide body 11 from the second structural subunit 12b in the coupling area 11a, the red and green light cannot enter the waveguide body 11 from the second structural subunit 12b, and the blue light is in the waveguide The inside of the sheet body 11 is totally reflected to the coupling-out area 11b, and can be emitted from the second structure subunit 12b of the coupling-out area 11b; green light can enter the waveguide sheet body 11 from the third structure subunit 12c of the coupling area 11a, The blue and red light cannot enter the waveguide sheet body 11 from the third structural subunit 12c of the coupling area 11a, and the green light is totally reflected in the waveguide sheet body 11 to the coupling-out area 11b, and can pass from the third structure of the coupling-out area 11b. The structural subunit 12c is ejected. The nano-waveguide lens 10 of the present invention does not need to adopt a complicated waveguide structure, and adopts spatial multiplexing mode to distribute the structural subunits 12a, 12b, 12c, and does not need to use double-layer or even multilayer waveguides to separate color and guide light to achieve color. And the technical cost is more advantageous.

The present invention is not limited to the specific details in the foregoing embodiments. Within the scope of the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention. The various specific technical features described in the foregoing specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described separately in the present invention.

Claims (10)

1. A nano waveguide lens, which is characterized by comprising a waveguide sheet body, the surface of the waveguide sheet body is provided with a coupling-in area and a coupling-out area, and a plurality of structural unit pixels are provided in the coupling-in area and the coupling-out area, Each of the structural unit pixels includes a first structural subunit, a second structural subunit, and a third structural subunit;

   When image light enters the coupling area, red light can enter the waveguide sheet body from the first structure subunit of the coupling area, and blue and green light cannot enter the waveguide sheet body from the first structure subunit , The red light is totally reflected in the body of the waveguide sheet to the coupling-out area, and is emitted from the first structural subunit of the coupling-out area;

   Blue light can enter the waveguide sheet body from the second structural subunit of the coupling area, red light and green light cannot enter the waveguide sheet body from the second structural subunit, and blue light is totally reflected in the waveguide sheet body. The coupling-out area can be ejected from the second structural subunit of the coupling-out area;

   Green light can enter the waveguide sheet body from the third structure subunit of the coupling area, blue light and red light cannot enter the waveguide sheet body from the third structure subunit of the coupling area, and green light is in the waveguide sheet The body is totally reflected to the coupling-out area, and can be emitted from the third structural subunit of the coupling-out area.
2. The nano-waveguide lens of claim 1, wherein the first structure subunit includes a plurality of first diffraction gratings, the second structure subunit includes a plurality of second diffraction gratings, and the third structure subunit includes Multiple third diffraction gratings.
3. 3. The nano-waveguide lens of claim 2, wherein the period of the first diffraction grating matches the wavelength of red light; the period of the second diffraction grating matches the wavelength of blue light; the period of the third diffraction grating matches The wavelength of the green light matches.
4. 3. The nano-waveguide lens of claim 2, wherein each of the first diffraction gratings is obliquely arranged; each of the second diffraction gratings is obliquely arranged; and each of the third diffraction gratings is obliquely arranged.
5. The nano-waveguide lens of claim 1, wherein the size of each structural unit pixel is 5-200 μm.
6. The nano-waveguide lens of claim 1, wherein the body of the waveguide sheet has a single-layer structure.
7. A three-dimensional display device, characterized by comprising the nano-waveguide lens according to any one of claims 1 to 6.
8. 7. The three-dimensional display device of claim 7, wherein the three-dimensional display device further comprises a display device and a lens, the display device is located above the nanowaveguide lens, and the lens is disposed between the display device and the nanowaveguide lens. Meanwhile, the image light emitted by the display device passes through the lens and is incident on the coupling area of the nanowaveguide lens.
9. A spectacle, characterized by comprising the nano-waveguide lens according to any one of claims 1 to 6.
10. 9. The glasses of claim 9, wherein the glasses further comprise a frame and a temple, one end of the temple is connected to the frame, the frame is provided with two nano-waveguide lenses, two nano-waveguides The coupling-out area of the lens is set corresponding to the human eye.

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