Metalens array-based binocular near-eye integral imaging 3D display system

Abstract

The present application relates to a metalens array-based binocular near-eye integral imaging three-dimensional (3D) display system, comprising: a first micro-display screen arranged within a right-eye field of view and a second micro-display screen arranged within a left-eye field of view. A first metalens array is arranged on the side of the first micro-display screen where an image is displayed, and a second metalens array is arranged on the side of the second micro-display screen where an image is displayed; the first micro-display screen and the second micro-display screen are used for providing image source light having binocular disparity, and the first metalens array and the second metalens array are used for modulating the image source light having binocular disparity to generate two 3D images having binocular disparity and depth information. Compared with conventional technologies, the present application can simultaneously achieve adjustment of the focal positions and the vergence angles of the left and right eyes of a viewer, bringing more realistic and accurate spatial 3D perception to users, and better conforming to natural viewing habits of the human body.

Description

A binocular near-eye integrated imaging 3D display system based on a superlens array Technical Field

[0001] This application relates to the fields of micro-nano optics and optical imaging technology, and in particular to a binocular near-eye integrated imaging 3D display system based on a superlens array. Background Technology

[0002] Benefiting from the increased pixel density of microscreens in recent years, head-mounted display devices have garnered increasing attention in academia and business. In real life, due to the convergence of human eyes, the angle between the eyes changes depending on the actual depth of the viewing position; simultaneously, the focusing position of the eyes also adjusts with the depth of the object being viewed. Currently, most head-mounted display devices on the market achieve 3D effects solely through the principle of binocular parallax when displaying near-eye images. The angle between the user's eyes changes continuously with the depth of the 3D image due to convergence. However, because the eyes need to focus on the device's screen surface to see the displayed image clearly, the user's eyes are constantly focused on the screen surface. This creates a convergence conflict between the constantly changing angle of eye rotation due to convergence and the fixed focusing position of the eyes, leading to dizziness and other discomfort for the user.

[0003] Integrated imaging light field display is a true 3D display technology that allows the observer's eye to focus on a location that is no longer fixed on the surface of a miniature screen, but rather changes constantly with the actual position of the generated 3D image. This is more in line with the natural viewing habits of the human eye and is more comfortable. It typically uses microlens arrays. However, existing microlens array devices are themselves large, heavy, and have uneven surfaces, which makes it difficult to combine them with other devices and achieve high-quality integrated imaging 3D display effects.

[0004] Existing technology discloses a near-eye integrated imaging 3D display system and a head-mounted display device based on a superlens array. The near-eye integrated imaging 3D display system includes a microdisplay screen for displaying an image source and providing image source light, and a superlens array. The superlens array is disposed on one side of the microdisplay screen displaying the image. The superlens array is used to modulate the image source light from the microdisplay screen, enabling the image source light to reconstruct a 3D image on different depth surfaces. The drawback of this solution is that it can only adjust the focus position of a single eye of the viewer, and cannot adjust the viewer's binocular convergence angle.

[0005] Therefore, in light of the above requirements and the shortcomings of existing technologies, this application proposes a binocular near-eye integrated imaging 3D display system based on a superlens array. Summary of the Invention

[0006] This invention provides a binocular near-eye integrated imaging 3D display system based on a superlens array. It matches the viewer's binocular focusing position, binocular convergence adjustment angle, and the depth position of the generated 3D content, bringing users a more realistic and accurate sense of spatial stereoscopic effect, which is more in line with the human body's natural observation habits.

[0007] The primary objective of this invention is to solve the aforementioned technical problems. The technical solution of this invention is as follows:

[0008] The first aspect of the present invention provides a binocular near-eye integrated imaging 3D display system based on a superlens array, comprising: a first microdisplay screen disposed within the right eye's visual field and a second microdisplay screen disposed within the left eye's visual field; a first superlens array disposed on one side of the first microdisplay screen displaying an image, and a second superlens array disposed on one side of the second microdisplay screen displaying an image; the first and second microdisplay screens are used to provide image source light with binocular parallax, and the first and second superlens arrays are used to modulate the image source light with binocular parallax to generate two 3D images with binocular parallax and depth information.

[0009] Furthermore, the first and second superlens arrays have the same focal length and are each composed of several superlenses with the same size and focal length, wherein the size of the superlens is an integer multiple of the pixel size of the first and second microdisplays.

[0010] Furthermore, a first beam splitter is disposed between the first superlens array and the right eye, and a second beam splitter is disposed between the second superlens array and the left eye. The first and second beam splitters are used to fuse the reconstructed 3D image with the external ambient light, and to switch between augmented reality and virtual reality display effects by adjusting the ratio of the 3D image light to the external light during the fusion process.

[0011] Furthermore, the first and second superlens arrays include a substrate layer and a micro / nano structure layer. The material of the micro / nano structure layer is UV-curable adhesive doped with nanoparticles. The micro / nano structures are arranged in a cylindrical shape on the substrate layer, and the arrangement of the micro / nano structures satisfies the phase distribution of the superlens array.

[0012] Furthermore, the superlenses are arranged periodically within the first and second superlens arrays, and all superlenses satisfy the following phase distribution formula:

[0013] In this context, the origin coordinates are taken as the center of the superlens, (x,y) represents the coordinate position of the distance from the center of the superlens, λ represents the wavelength of the incident light, f represents the focal length of the superlens, and C is the phase constant.

[0014] Furthermore, the image source light with binocular parallax provided by the first microdisplay and the second microdisplay is a 2D image generated by an integrated imaging algorithm. The integrated imaging algorithm controls the generated image source light based on the position of the viewer's left and right eyes, the interpupillary distance of the binoculars, the depth of the displayed 3D object, the distance between the superlens array and the screen, the focal length period duty cycle of the superlens array, the size of the screen pixels, and the number of individual superlens modulation pixels.

[0015] Furthermore, the generated 2D image, as the source light, satisfies the following formula:

[0016] Where pa is the parallax of the central regions of the two 2D images displayed on the two microscreens, corresponding to the difference in the field of view of the left and right eyes, L is the binocular interpupillary distance of the viewer, depth is the distance from the imaging surface to the lens, gap is the distance from the screen to the superlens array, and pp is the pixel size of the micro-display screen; after the light rays emitted by the image source enter the right or left eye, they will reconstruct a virtual 3D object at the same depth and position at a distance. When the eyes observe separately, 3D images are obtained from different perspectives. When the eyes observe together, a complete 3D object is reconstructed at a distance.

[0017] A second aspect of the present invention provides a head-mounted display device, comprising: a bracket and a connector, wherein the bracket is mounted on glasses via the connector, and the bracket is provided with the aforementioned binocular near-eye integrated imaging 3D display system based on a superlens array.

[0018] Furthermore, the bracket is provided with a first micro-display screen and a second micro-display screen that are parallel to the viewer's line of sight. A first superlens array is provided at a preset distance from the bottom of the first micro-display screen, and a second superlens array is provided at a preset distance from the bottom of the second micro-display screen. A first beam splitter and a second beam splitter are provided at the ends of the first and second superlens arrays that are away from the micro-display screens, respectively.

[0019] Furthermore, the angle between the first and second beam splitters and the superlens array is 45°. The image source light emitted by the first microdisplay is modulated by the first superlens array and transmitted to the right eye through the first beam splitter. The image source light emitted by the second microdisplay is modulated by the second superlens array and transmitted to the left eye through the second beam splitter. The light from both sides is fused by the visual center of the human eye to construct a complete 3D object in the distance.

[0020] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0021] This invention provides a binocular near-eye integrated imaging 3D display system based on a superlens array. The superlens array can perform subwavelength level light field modulation. By using two superlens arrays to modulate the image source light with binocular parallax provided by two microdisplays, two 3D images with binocular parallax and depth information are generated. This allows the observer's binocular focus position and binocular convergence angle to match the set 3D image generation depth, while also eliminating the problem of mismatch between focus position and convergence angle, reducing the user's dizziness and visual fatigue after prolonged use. Attached Figure Description

[0022] Figure 1 is a schematic diagram of a binocular near-eye integrated imaging 3D display system based on a superlens array according to the present invention;

[0023] Figure 2 is a schematic diagram of a superlens array in one embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of light focusing after light shines on the superlens array from bottom to top in one embodiment of the present invention;

[0025] Figure 4 is a cross-sectional view of the light field in the xz direction of a single superlens in a superlens array of the present invention under different wavelengths of light incident;

[0026] Figure 5 is a schematic diagram of calculating the parallax of the central regions of two 2D images displayed on two micro-display screens in one embodiment of the present invention.

[0027] Figure 6 is a schematic diagram of a head-mounted display device according to the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] Example 1

[0030] As shown in Figure 1, the present invention provides a binocular near-eye integrated imaging 3D display system based on a superlens array, comprising: a first microdisplay 5 disposed within the visual field of the right eye 1, and a second microdisplay 6 disposed within the visual field of the left eye 2; a first superlens array 3 disposed on one side of the first microdisplay 5 displaying an image, and a second superlens array 4 disposed on one side of the second microdisplay 6 displaying an image; the first microdisplay 5 and the second microdisplay 6 are used to provide image source light with binocular parallax, and the first superlens array 3 and the second superlens array 4 are used to modulate the image source light with binocular parallax to generate two 3D images with binocular parallax and depth information.

[0031] It should be noted that the pixel emission spectral lines of the selected microdisplay should be as narrow as possible to reduce the imaging blur caused by the lateral chromatic aberration of the superlens.

[0032] In one specific embodiment, the emission spectral lines are narrowed by adding a narrowband filter between the microdisplay and the superlens array. The selected microdisplay is one of several types, including liquid crystal on silicon (LCoS), liquid crystal display (LCD), digital micromirror device (DMD), digital light processing (DLP), silicon OLED, Micro LED, quantum dot display (QLED), electronic paper display (EPD), microelectromechanical system display (MEMS), laser display, and holographic display.

[0033] As shown in Figure 2, the first superlens array 3 and the second superlens array 4 have the same focal length and are both composed of several superlenses 301 with the same size and focal length. The size of the superlens 301 is an integer multiple of the pixel size of the first microdisplay 5 and the second microdisplay 6.

[0034] A first beam splitter 8 is disposed between the first superlens array 3 and the right eye 1, and a second beam splitter 9 is disposed between the second superlens array 4 and the left eye 2. The first beam splitter 8 and the second beam splitter 9 are used to fuse the reconstructed 3D image with the external ambient light, and to switch between augmented reality and virtual reality display effects by adjusting the ratio of the 3D image light and the external light during the fusion process.

[0035] It should be noted that the two beam-splitting elements are used to fuse the reconstructed 3D image with the external ambient light to achieve an augmented reality effect. In this embodiment, the first beam-splitting element 8 and the second beam-splitting element 9 can be a beam-splitting prism, a cubic beam splitter, a plate beam splitter, a polarizing beam splitter, a beam splitter sheet, a liquid crystal sheet, electrochromic glass, etc.

[0036] The first superlens array 3 and the second superlens array 4 include a silicon dioxide substrate 303 and a micro / nano structure layer 302 as shown in FIG3. The material of the micro / nano structure layer 302 is UV-curable adhesive doped with nanoparticles. The micro / nano structures are arranged on the substrate in a cylindrical shape, and the arrangement of the micro / nano structures satisfies the phase distribution of the superlens array.

[0037] It should be noted that different arrangements of micro / nano structures will alter their duty cycle, thus affecting the difficulty of subsequent micro / nano fabrication and the optical performance of the designed superlens array. Therefore, the choice must be made based on the specific circumstances. Using UV-curable adhesives doped with nanoparticles as the micro / nano structure layer material allows for device fabrication using UV-based nanoimprint lithography, which reduces production costs, but negatively impacts the optical performance of the superlens array. Furthermore, different doped nanoparticles will affect the optical performance of the superlens array under different colors of light, requiring selection based on the specific situation.

[0038] In one specific embodiment, the arrangement of the micro / nanostructure can be a periodic arrangement of one of the following: tetragonal lattice, hexagonal lattice, diagonal mesh, triangular mesh, rhombus, etc. The material of the micro / nanostructure layer includes a UV-curable adhesive doped with nanoparticles, such as silicon particles, amorphous silicon particles, titanium dioxide particles, zirconium dioxide particles, silicon carbide particles, gold particles, silver particles, quantum dots, etc. Other materials for the micro / nanostructure layer include silicon dioxide, silicon nitride, amorphous silicon, monocrystalline silicon, titanium dioxide, zirconium dioxide, etc.; the substrate layer material includes silicon dioxide, silicon nitride, amorphous silicon, titanium dioxide, etc. Materials that can be covered on the micro / nanostructure layer include silicon dioxide, silicon nitride, amorphous silicon, monocrystalline silicon, titanium dioxide, zirconium dioxide, etc. When selecting materials such as silicon dioxide, silicon nitride, amorphous silicon, single crystal silicon, titanium dioxide, and zirconium dioxide for the micro / nano structure layer, high-cost traditional photolithography processes can be used to fabricate the superlens array, which has a positive impact on the optical performance of the superlens array. Different materials will affect the optical performance of the superlens array under different colors of light, and the selection needs to be based on the actual situation.

[0039] The superlenses 301 are arranged periodically within the first superlens array 3 and the second superlens array 4, and all the superlenses 301 satisfy the following phase distribution formula:

[0040] In this coordinate system, the center of the superlens 301 is taken as the origin, (x,y) represents the coordinate position of the distance from the center of the superlens 301, λ represents the incident light wavelength, f represents the focal length of the superlens 301, and C is the phase constant. In a specific embodiment, the wavelength λ is 532nm, the focal length f is 2.57mm, and the side length of the superlens is 460μm.

[0041] As shown in Figure 3, the superlens array 3 is formed by arranging nanoscale cylindrical micro-nano structures 302 of varying sizes on a silicon dioxide substrate 303 in a manner that satisfies the phase distribution of the lens array. In this embodiment, the period of the cylindrical structure is 400nm and the height is 500nm. When light with a wavelength of 532nm is incident perpendicularly from the substrate surface, multiple focal points will be generated at a position 2.57mm away from the micro-nano structures.

[0042] As shown in Figure 4, the left column shows the light intensity distribution of the superlens at the xz cross section measured in the experiment under the condition that light of wavelengths of 457nm, 532nm, and 660nm is incident perpendicularly on the superlens; the focal lengths are approximately 3.00mm, 2.59mm, and 2.07mm, respectively; the right column shows the light intensity distribution of the xy cross section at the focal point under different wavelengths, with half-widths of approximately 2.66μm, 2.62μm, and 2.61μm, respectively.

[0043] It should be noted that the first microdisplay 5 and the second microdisplay 6 are used to display two integrated imaging source images or dynamic images with binocular parallax. The image source light with binocular parallax provided by the first microdisplay 5 and the second microdisplay 6 is a 2D image generated by an integrated imaging algorithm. The integrated imaging algorithm controls the generated image source light according to the position of the viewer's left and right eyes, the interpupillary distance of the two eyes, the depth of the displayed 3D object, the distance between the superlens array and the screen, the focal length period duty cycle of the superlens array, the size of the screen pixels, and the number of individual superlens modulation pixels.

[0044] The image source image needs to be generated using an integrated imaging algorithm to produce two 2D image source images with parallax information and depth information. The image source image is composed of many element images with different viewpoints, and the viewpoint of the element image corresponds one-to-one with the viewpoint of each superlens in the lens array.

[0045] As shown in Figure 5, the generated 2D image, as the source light, satisfies the following formula:

[0046] Where pa represents the parallax of the central regions of the two 2D images displayed on the two microscreens, corresponding to the difference in the field of view between the left and right eyes; L is the binocular interpupillary distance of the viewer; depth is the distance from the imaging surface to the lens; gap is the distance from the screen to the superlens array; and pp is the pixel size of the microdisplay screen. In a specific embodiment, the size of gap is chosen to be 2.47 mm, and the size of pp is 4.6 μm.

[0047] The light rays emitted from the image source enter the right eye 1 or the left eye 2, and then reconstruct a virtual 3D object at the same depth and position in the distance. When each eye observes the image separately, a 3D image is obtained from a different perspective. When both eyes observe the image together, a complete 3D object is reconstructed in the distance.

[0048] Based on the above technical features, the present invention provides a binocular near-eye integrated imaging 3D display system based on a superlens array. It utilizes two superlens arrays to modulate the image source light with binocular parallax provided by two micro-screens to generate two 3D images with binocular parallax and depth information, so that the focus position of the observer's eyes and the convergence angle of the eyes are simultaneously matched with the set 3D image generation depth.

[0049] Compared with common binocular 2D head-mounted display devices on the market, the binocular near-eye integrated imaging 3D display system based on a superlens array provided by this invention allows the viewer's binocular focus position to change with the depth of the generated 3D content, eliminating the problem of mismatch between focus position and convergence angle, reducing the user's dizziness and visual fatigue after prolonged use.

[0050] Compared to monocular 3D display devices, the binocular near-eye integrated imaging 3D display system based on a superlens array provided by this invention allows the viewer's binocular convergence adjustment angle to change with the depth of the generated 3D content, bringing users a more realistic and accurate sense of spatial stereoscopic effect, which is more in line with the human body's natural observation habits.

[0051] Compared to previous near-eye integrated imaging 3D display systems based on microlens arrays, this invention uses two superlens arrays to modulate the image source light from two microscreens. While microlens arrays achieve optical control based on the thickness of different material locations, the superlens array sample is optically controlled by artificially designed nanopillars on its surface. This makes the device's weight and thickness approximately equal to the weight and thickness of the substrate glass sheet, resulting in low weight and thinness. Furthermore, due to the artificial design of the nanopillars, they can fill the working area of ​​the sample, enabling subwavelength-level optical field control. Therefore, this solution features a high duty cycle, resolution approaching the optical diffraction limit, and high degree of freedom in optical field control. Finally, since the fabrication of the superlens array is suitable for nanoimprint lithography, this solution offers low cost and high production capacity.

[0052] Example 2

[0053] As shown in Figure 6, the present invention also provides a head-mounted display device, including: a bracket 10 and a connector 11. The bracket 10 is mounted on glasses via the connector 11, and the bracket 10 is provided with the aforementioned binocular near-eye integrated imaging 3D display system based on a superlens array.

[0054] The bracket 10 is respectively provided with a first micro-display screen 5 and a second micro-display screen 6 perpendicular to the eyeglass lens. A first superlens array 3 is provided at a preset distance from the bottom of the first micro-display screen 5, and a second superlens array 4 is provided at a preset distance from the bottom of the second micro-display screen 6. A first beam splitter 8 and a second beam splitter 9 are respectively provided at the ends of the first superlens array 3 and the second superlens array 4 away from the micro-display screen.

[0055] The angle between the first beam splitter 8 and the second beam splitter 9 and the superlens array is 45°. The image source light emitted by the first microdisplay 5 is modulated by the first superlens array 3 and transmitted to the right eye 1 through the first beam splitter 8. The image source light emitted by the second microdisplay 6 is modulated by the second superlens array 4 and transmitted to the left eye 2 through the second beam splitter 9. The light from both sides is fused by the visual center of the human eye to construct a complete 3D object in the distance.

[0056] In this embodiment, the bracket 10, connector 11, and a binocular near-eye integrated imaging 3D display system based on a superlens array mounted on the bracket 10 can all be fixed to the eyeglass frame by a 3D printed frame, facilitating the observer's wearing experience. Identical 3D printed frames exist above both eyes of the eyeglass frame to fix the micro-screens, lens arrays, and beam splitters. During viewing, the micro-screens above the left and right eyes display two source images with binocular parallax. After modulation by the corresponding superlens arrays and reflection by the beam splitters, the left and right eyes observe different virtual images of 3D objects with binocular parallax. Through synthesis by the human visual center, a complete 3D object can be presented in the distance.

[0057] In a specific embodiment, the imaging process is described in detail with reference to Figures 1 and 6. As shown in Figure 6, the imaging process is as follows: As shown in Figure 1, taking the imaging process corresponding to the left eye 2 as an example, the second micro-display 6 displays a source 2D image corresponding to the left eye's viewpoint; the source 2D image is composed of element images with the same number of superlenses 301 in the second superlens array 4. Each element image corresponds to the information to be recorded at different positions in the left eye's viewpoint for generating a 3D object; each individual superlens 301 in the second superlens array 4 corresponds one-to-one with each element image displayed on the second micro-display 6; the superlens 301 modulates the light of the corresponding element image into divergent light, which enters the left eye 2 after being reflected by the second beam splitter 9; the left eye 2 can see the 3D object reconstructed by the divergent light in the distance in the forward direction.

[0058] Similarly, as shown in Figure 1, the right eye 1 can also see the 3D object reconstructed in the distance from the right eye's perspective. The light entering the right eye 1 is the image source light emitted by the first micro-display screen 5, which displays the source 2D image corresponding to the right eye 1's perspective. After being modulated by the first superlens array 3, it is reflected by the first beam splitter 8.

[0059] In this embodiment, 3D objects are reconstructed in front of both the left and right eyes, and the focusing depth of both the left and right eyes is the actual depth position of the generated virtual 3D objects. There will be binocular parallax in the 3D objects seen by the left and right eyes. The convergence rotation angle of the eyes will match the depth of the reconstructed 3D objects, and the visual axes of the eyes will point to the reconstructed 3D objects. Since the focusing position of the eyes matches the convergence rotation angle of the eyes, there is no convergence adjustment conflict problem, which will give the viewer a more comfortable viewing experience and a more accurate 3D sense.

[0060] Furthermore, compared to near-eye integrated imaging 3D display systems that use existing lens arrays, such as microlens arrays, this binocular near-eye integrated imaging 3D display system based on a microlens array and its head-mounted display device also have advantages such as light weight, thinness, array duty cycle up to 100%, high degree of freedom in light field modulation, lower price, and high production capacity.

[0061] Example 3

[0062] Based on the above embodiment 1, and in conjunction with Figures 2-4, this embodiment elaborates in detail the construction of the superlens array of the present invention and the light intensity distribution of the lens output light field cross section at different wavelengths.

[0063] As shown in Figure 2, the first superlens array 3 and the second superlens array 4 are composed of many individual superlenses 301 with the same focal length, arranged in a square lattice. In a specific embodiment, as shown in Figure 3, the first superlens array 3 and the second superlens array 4 are composed of nanoscale cylindrical micro / nanostructures 302 of different sizes arranged on a silicon dioxide substrate 303 in a manner that satisfies the phase distribution of the lens array. In this embodiment, the period of the cylindrical structure is 400 nm and the height is 500 nm. When light with a wavelength of 532 nm is incident perpendicularly from the substrate surface, multiple focal points will be generated at a position 2.57 mm away from the micro / nanostructure.

[0064] Light with wavelengths of 457nm, 532nm, and 660nm was incident perpendicularly on the superlens, resulting in the schematic diagram shown in Figure 4. The light intensity distribution of the superlens's light field at the xz cross section can be measured. The focal lengths are approximately 3.00mm, 2.59mm, and 2.07mm, respectively. The column on the right shows the light intensity distribution at the focal point at the xy cross section under different wavelengths, with half-widths of approximately 2.66μm, 2.62μm, and 2.61μm, respectively.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. The icons depicting structural positional relationships in the accompanying drawings are for illustrative purposes only and should not be construed as limiting the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A binocular near-eye integrated imaging 3D display system based on a superlens array, characterized in that, It includes: a first microdisplay (5) disposed within the field of vision of the right eye (1) and a second microdisplay (6) disposed within the field of vision of the left eye (2). A first superlens array (3) is disposed on one side of the first microdisplay (5) displaying an image, and a second superlens array (4) is disposed on one side of the second microdisplay (6) displaying an image. The first microdisplay (5) and the second microdisplay (6) are used to provide image source light with binocular parallax, and the first superlens array (3) and the second superlens array (4) are used to modulate the image source light with binocular parallax to generate two 3D images with binocular parallax and depth information.

2. The binocular near-eye integrated imaging 3D display system based on a superlens array according to claim 1, characterized in that, The first superlens array (3) and the second superlens array (4) have the same focal length and are each composed of several superlenses (301) with the same size and focal length. The size of the superlens (301) is an integer multiple of the pixel size of the first microdisplay (5) and the second microdisplay (6).

3. The binocular near-eye integrated imaging 3D display system based on a superlens array according to claim 2, characterized in that, A first beam splitter (8) is provided between the first superlens array (3) and the right eye (1), and a second beam splitter (9) is provided between the second superlens array (4) and the left eye (2). The first beam splitter (8) and the second beam splitter (9) are used to fuse the reconstructed 3D image with the external ambient light, and to switch between augmented reality and virtual reality display effects by adjusting the ratio of the 3D image light and the external light during the fusion process.

4. The binocular near-eye integrated imaging 3D display system based on a superlens array according to claim 2, characterized in that, The first superlens array (3) and the second superlens array (4) include a substrate layer and a micro / nano structure layer. The material of the micro / nano structure layer is UV-curable adhesive doped with nanoparticles. The micro / nano structure is arranged in a cylindrical shape on the substrate layer. The arrangement of the micro / nano structure satisfies the phase distribution of the superlens array.

5. A binocular near-eye integrated imaging 3D display system based on a superlens array according to claim 4, characterized in that, The superlenses (301) are arranged periodically within the first superlens array (3) and the second superlens array (4), and all the superlenses (301) satisfy the following phase distribution formula: In this context, the origin coordinates are taken as the center of the superlens, (x,y) represents the coordinate position of the distance from the center of the superlens, λ represents the wavelength of the incident light, f represents the focal length of the superlens, and C is the phase constant.

6. A binocular near-eye integrated imaging 3D display system based on a superlens array according to claim 5, characterized in that, The image source light with binocular parallax provided by the first microdisplay (5) and the second microdisplay (6) is a 2D image generated by an integrated imaging algorithm. The integrated imaging algorithm controls the generated image source light according to the position of the viewer's left and right eyes, the interpupillary distance of the binoculars, the depth of the displayed 3D object, the distance between the superlens array and the screen, the focal length period duty cycle of the superlens array, the size of the screen pixels, and the number of individual superlens modulation pixels.

7. A binocular near-eye integrated imaging 3D display system based on a superlens array according to claim 6, characterized in that, The generated 2D image, as the source light, satisfies the following formula: Where pa is the parallax of the central regions of the two 2D images displayed on the two micro screens, corresponding to the difference in the field of view of the left and right eyes, L is the binocular interpupillary distance of the viewer, depth is the distance from the imaging surface to the superlens array, gap is the distance from the screen to the superlens array, and pp is the pixel size of the micro display screen; after the light rays emitted by the image source enter the right eye (1) or the left eye (2), a virtual 3D object will be reconstructed at the same depth and position at a distance. When the eyes observe separately, 3D images are obtained from different perspectives. When the eyes observe together, a complete 3D object is reconstructed at a distance.

8. A head-mounted display device, characterized in that, include: A bracket (10) and a connector (11) are provided on the glasses via the connector (11). The bracket (10) is equipped with a binocular near-eye integrated imaging 3D display system based on a superlens array as described in any one of claims 1-7.

9. A head-mounted display device according to claim 8, characterized in that, The bracket (10) is provided with a first micro-display screen (5) and a second micro-display screen (6) that are parallel to the viewer's line of sight. A first superlens array (3) is provided at a preset distance from the bottom of the first micro-display screen (5), and a second superlens array (4) is provided at a preset distance from the bottom of the second micro-display screen (6). A first beam splitter (8) and a second beam splitter (9) are provided at the ends of the first superlens array (3) and the second superlens array (4) that are away from the micro-display screens, respectively.

10. A head-mounted display device according to claim 9, characterized in that, The angle between the first beam splitter (8) and the second beam splitter (9) and the superlens array is 45°. The image source light emitted by the first microdisplay (5) is modulated by the first superlens array (3) and transmitted to the right eye (1) through the first beam splitter (8). The image source light emitted by the second microdisplay (6) is modulated by the second superlens array (4) and transmitted to the left eye (2) through the second beam splitter (9). The light from both sides is fused by the visual center of the human eye to construct a complete 3D object in the distance.

Images