Virtual-real fusion space transparent display system

Abstract

The utility model relates to the technical field of display, and particularly discloses a virtual-real fusion space transparent display system, which comprises an image generation device and at least two transparent nano display screens, the transparent nano display screen comprises a transparent waveguide substrate, and a coupling-in structure and a coupling-out structure which are arranged on the surface of the transparent waveguide substrate or in the transparent waveguide substrate, and the coupling-in structure is configured to receive input light generated by the image generation device and couple the input light to the transparent waveguide substrate so that the input light can be totally reflected and conducted in the transparent waveguide substrate; the coupling-out structure is configured to couple at least part of light of the waveguide in the transparent waveguide substrate out of the transparent waveguide substrate through diffraction; for the same transparent nano display screen, the reverse extension lines of the diffracted light coupled out of the transparent waveguide substrate are converged to the same depth plane, and different transparent nano display screens correspond to different depth planes. Therefore, the image information can be displayed at different depth positions in the real space, depth fusion with the real space is realized, and stereoscopic display is realized.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a virtual-real fusion space transparent display system. Background Art

[0002] With the development of display technology, traditional flat-panel displays have transitioned to multi-dimensional, multi-space stereoscopic displays, augmented reality displays, etc., and the diversity and innovation of displays are increasing.

[0003] Among them, many manufacturers have developed transparent displays, that is, displaying images on a transparent screen under visible light, so that you can see the information on the screen and the real space through the screen. This has been widely used in exhibitions, smart displays and other fields. However, it is still a flat panel display in essence and has not brought about revolutionary display changes. Some manufacturers have proposed floating displays, which use multiple reflections to make the image surface float in space. However, in order to achieve floating displays, the display device or equipment is large in size and requires a certain amount of space to conduct light, which limits some application markets. Utility Model Content

[0004] Based on this, it is necessary to provide a virtual-reality fusion space transparent display system for the above-mentioned problems, including an image generating device and at least two transparent nano display screens;

[0005] The transparent nano display screen includes a transparent waveguide substrate, and a coupling-in structure and a coupling-out structure arranged on the surface or inside of the transparent waveguide substrate, wherein the coupling-in structure is configured to receive input light generated by the image generating device and couple the input light to the transparent waveguide substrate so that the input light is totally reflected and conducted in the transparent waveguide substrate, and the coupling-out structure is configured to couple at least part of the light waveguided in the transparent waveguide substrate out of the transparent waveguide substrate by diffraction;

[0006] For the same transparent nano display screen, the reverse extension lines of the diffracted light coupled out of the transparent waveguide substrate converge to the same depth plane, and different transparent nano display screens correspond to different depth planes.

[0007] In one embodiment, both the coupling-in structure and the coupling-out structure include periodically arranged nanostructures.

[0008] In one embodiment, the periodic arrangement of the nanostructures in the outcoupling regions of each transparent nanodisplay screen corresponding to different depth planes is different.

[0009] In one embodiment, for some of the transparent nano-display screens, the periods of the nano-structures in the out-coupling structures are consistent.

[0010] In one embodiment, for some of the transparent nano-display screens, the periods of the nano-structures in the out-coupling structure are inconsistent.

[0011] In one embodiment, the period of the nanostructures in the coupling-in structure is consistent, the period of the nanostructures in the coupling-out structure gradually increases from the direction away from the coupling-in structure, and the period of the nanostructures in the middle position of the coupling-out structure is the same as the period of the nanostructures in the coupling-in structure.

[0012] In one embodiment, the period of the nanostructures in the coupling-in structure is inconsistent, the period of the nanostructures in the coupling-in structure gradually increases from the direction approaching the coupling-out structure, the period of the nanostructures in the coupling-out structure gradually increases from the direction away from the coupling-in structure, and the period of the nanostructures in the middle position of the coupling-out structure is the same as the period of the nanostructures in the middle position of the coupling-in structure.

[0013] In one of the embodiments, different transparent nano display screens receive different input lights generated by the image generating device to display images of different parts of the full field of view at different depth planes.

[0014] In one embodiment, different transparent nano display screens correspond to different image generating devices;

[0015] Two adjacent transparent nano-display screens and their corresponding image generating devices are symmetrically arranged, wherein the image generating device corresponding to one transparent nano-display screen is distributed on the side of the transparent nano-display screen facing away from the other transparent nano-display screen;

[0016] Wherein, a light isolation layer is arranged between two adjacent transparent nano display screens.

[0017] In one embodiment, different transparent nano display screens correspond to the same image generating device, and a light splitting modulation unit is disposed in the image generating device, and the light splitting modulation unit is used to generate different input lights for different transparent nano display screens.

[0018] The virtual-reality fusion space transparent display system provided in the embodiment of the present application includes an image generating device and at least two transparent nano-display screens. Each transparent nano-display screen is capable of receiving input light generated by the image generating device and coupling and transmitting the input light within the screen body, and finally diffracting the output. For the same transparent nano-display screen, the reverse extension lines of the output diffracted light converge to the same depth plane. Different transparent nano-display screens correspond to different depth planes. Therefore, image information can be displayed at different depth positions in the real space to achieve deep fusion with the real space. Stereoscopic display can be achieved by combining images at different depth positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of an application scenario of a virtual-reality fusion space transparent display system provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of imaging in depth plane 1 of a virtual-reality fusion space transparent display system provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of imaging in depth plane 2 of a virtual-reality fusion space transparent display system provided in an embodiment of the present application;

[0022] Figure 4 is a schematic diagram of the depth range;

[0023] Figure 5 A schematic diagram of periodic distribution of nanostructures in one embodiment of the present application;

[0024] Figure 6 A schematic diagram of periodic distribution of nanostructures in one embodiment of the present application;

[0025] Figure 7 A schematic diagram of periodic distribution of nanostructures in one embodiment of the present application;

[0026] Figure 8 A schematic diagram of multiple depth planes in an embodiment of the present application;

[0027] Fig. 9 A schematic diagram of periodic distribution of nanostructures in one embodiment of the present application;

[0028] Fig.10 This is a schematic diagram of the distribution of an image generating device in one embodiment of the present application;

[0029] Fig.11 This is a schematic diagram of the distribution of an image generating device in one embodiment of the present application;

[0030] Fig.12 This is a schematic diagram of the distribution of an image generating device in one embodiment of the present application;

[0031] Fig.13 Schematic diagram of the imaging structure in the comparative example.

[0032] Description of reference numerals:

[0033] 100, image generating device; 200a, first transparent nano display screen; 200b, second transparent nano display screen; 210, transparent waveguide substrate; 221, coupling-in structure; 222, coupling-out structure; 230, optical isolation layer. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to understand the disclosure of the present application more thoroughly and comprehensively.

[0035] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] With the development of display technology, traditional flat panel displays have transitioned to multi-dimensional, multi-space stereoscopic displays, augmented reality displays, etc., and the diversity and innovation of displays are increasing. Many manufacturers have developed transparent displays, that is, displaying images on a transparent screen under visible light. Not only can you see the information on the screen, but you can also see the real space through the screen. This has great applications in exhibitions, smart displays and other fields. But it is still a flat panel display in essence, and has not brought about revolutionary display changes. Some manufacturers have also proposed a suspended display, that is, the image surface is suspended in space through multiple reflections. This display method is novel and unique, and has great application prospects in scenarios such as vehicle-mounted displays and exhibition displays. However, in order to achieve suspended display, the display device or equipment is large in size and requires a certain amount of space to conduct light, which limits some application markets.

[0039] In response to the above problems, the embodiments of the present application provide a virtual-reality fusion space transparent display system, which can display image information at different depth positions in the real space and achieve deep fusion with the real space. Observers can perform virtual-reality fusion observation without wearing any equipment, and through the combination of images at different depth positions, stereoscopic display can be achieved. Compared with the floating display achieved through geometric optical reflection, the entire system is smaller in size, saves more space, and is easy to apply to more scenarios.

[0040] Reference Figure 1 The virtual-real fusion space transparent display system provided in this embodiment includes an image generating device 100 and at least two transparent nano display screens, wherein: Figure 1 FIG. 4 shows a situation where a first transparent nano display screen 200 a and a second transparent nano display screen 200 b are provided.

[0041] The image generating device 100 is used to provide image information and generate input light that enters the transparent nano display screen. Specifically, it may include an illumination module, a projection module, and a driving module. The illumination module is used to realize the input of the light source, and its illumination method may be LED, OLED, laser light source, etc. The projection module is used to realize the image light design output, and its image source method may be DLP, LCD, MEMS, etc. The driving module is used to control the input and output of the image signal. The overall form of the image generating device 100 can be designed to be small in size according to the requirements of the specific scene.

[0042] The transparent nano display screen is used to receive the input light generated by the image generating device 100, so that the input light is coupled, conducted and diffracted in the transparent nano display screen. In this embodiment, the transparent nano display screen has a high transmittance under visible light, and its transmittance is not less than 70%.

[0043] Specifically, refer to Figure 2-Figure 4The transparent nano display screen includes a transparent waveguide substrate 210 and a coupling-in structure 221 and a coupling-out structure 222 disposed on the surface or inside of the transparent waveguide substrate 210. In this embodiment, the coupling-in structure 221 and the coupling-out structure 222 may be grating structures. The coupling-in structure 221 is configured to receive the input light generated by the image generating device 100 and couple the input light to the transparent waveguide substrate 210 so that the input light is totally reflected and conducted in the transparent waveguide substrate 210, and the coupling-out structure 222 is configured to expand the light conducted in the transparent waveguide substrate 210 and couple out the transparent waveguide substrate 210 by diffraction. In this embodiment, the coupling-in structure 221 and the coupling-out structure 222 are both composed of structures or materials with diffraction characteristics, and can be distributed on the surface or inside of the transparent waveguide substrate 210. When distributed on the surface of the transparent waveguide substrate 210, the coupling-in structure 221 and the coupling-out structure 222 can be distributed on the same side surface of the transparent waveguide substrate 210, or can be located on the opposite side surfaces of the transparent waveguide substrate 210.

[0044] For the same transparent nano display screen, the diffracted light coupled out of the transparent waveguide substrate 210 is transmitted to the human eye, and its reverse extension line converges to the same depth plane. Different transparent nano display screens correspond to different depth planes. By setting the diffraction characteristics of the transparent nano display screen, the depth plane of the transparent nano display screen can be adjusted. In this embodiment, at least two transparent nano display screens are provided. For different transparent nano display screens, different diffraction characteristics can be set so that the observer sees images of different depth planes.

[0045] In this embodiment, the depth plane refers to the plane where the reverse extension line of the diffracted light coupled out of the transparent waveguide substrate 210 converges to the depth position. Figure 4 The depth plane where the image observed by the human eye is located depends on where the reverse extension line of the divergent light of a single pixel converges. Since the limiting resolution of human eye observation is an angular resolution of 1′, the convergence position less than 1′ can be considered as a clear display position, which brings a certain depth range. In other words, the depth plane in this embodiment is not a plane without physical thickness in a narrow sense, but a depth plane with a certain depth range.

[0046] Figure 1 The situation of two depth planes is shown in FIG. The observer is located in front of the virtual-real fusion space transparent display system and sees the image at a certain depth position in the real space through the virtual-real fusion space transparent display system. Figure 1 There are two depth planes, namely, depth plane 1 with far-focus depth information and depth plane 2 with near-focus depth information. Figure 1In a scene, when the observer focuses on the far distance, he can see the far focus depth information. At this time, if the image is displayed at the near focus depth, it will be blurred due to the eye focus. Similarly, when the observer focuses on the near distance, he can see the near focus depth information. At this time, if the image is displayed at the far focus depth, it will be blurred. The image display function of multiple focal planes can combine more different depths of real space for deep fusion display.

[0047] Figure 2 The situation corresponding to the depth plane 1 is shown in FIG. The input light generated by the image generating device 100 enters the transparent waveguide substrate 210 through the coupling structure 221, is totally reflected and transmitted in the transparent waveguide substrate 210 through the optical waveguide, and then optically expands and emits the light through the coupling structure 222. The human eye receives the emitted light and observes the converged pixels and images at the depth plane 1 of the real space along the reverse extension line. In this case, the light of a single pixel is plane parallel light after optical expansion.

[0048] Figure 3 The situation of depth plane 2 is shown. Figure 2 The difference is that the human eye receives the outgoing light and observes the converged pixels and images at the depth plane 2 of the real space along the reverse extension line. In this case, the light of a single pixel is divergent light on the observation side after optical expansion, rather than parallel light.

[0049] In this embodiment, the coupling-in structure 221 and the coupling-out structure 222 are both structures or materials with diffraction properties. Specifically, the coupling-in structure 221 and the coupling-out structure 222 can both be nanostructures with diffraction properties, wherein the nanostructures are arranged periodically.

[0050] In one embodiment, the periodic arrangement of the nanostructures in the outcoupling regions of each transparent nanodisplay screen corresponding to different depth planes is different. In this embodiment, the periodic arrangement of the nanostructures in the outcoupling structure 222 of the transparent nanodisplay screen is different, which will result in different convergence points of the reverse extension lines of the light collected by the human eye, that is, the transparent nanodisplay screen corresponds to different depth planes. Therefore, in order to make each transparent nanodisplay screen correspond to a different depth plane, in this embodiment, the periodic arrangement of the nanostructures in the outcoupling regions of each transparent nanodisplay screen is set to be different.

[0051] In one embodiment, for some of the transparent nano-display screens, the periods of the nano-structures in the out-coupling structure 222 are consistent. Figure 5 When the period of the nanostructures in the outcoupling structure 222 is consistent, that is, ΔP=0, the diffracted light that is finally emitted by the incident parallel light is still parallel light, so the reverse extension line of the diffracted light irradiating the human eye is also parallel light, which converges to infinity, that is, the observer observes the image at the depth plane at infinity.

[0052] In one embodiment, for some of the transparent nano-display screens, the periods of the nano-structures in the out-coupling structure 222 are inconsistent. Figure 6 When the periods of the nanostructures in the outcoupling structure 222 are inconsistent, that is, ΔP≠0, the diffracted light emitted by the incident parallel light is no longer parallel light, but divergent light. Therefore, the reverse extension line of the diffracted light irradiated to the human eye will converge to a finite distance, that is, the observer observes the image at a depth plane located at a finite distance. In practical applications, the periods of the nanostructures in the outcoupling structure 222 of each transparent nano display screen can also be adjusted separately, so that each transparent nano display screen corresponds to a different depth plane at a finite distance.

[0053] In one of the embodiments, in response to the situation where the period of the nanostructures in the out-coupling structure 222 is inconsistent, the period of the nanostructures in the coupling-in structure 221 is consistent, the period of the nanostructures in the out-coupling structure 222 gradually increases from the direction away from the coupling-in structure 221, and the period of the nanostructures in the middle position of the out-coupling structure 222 is the same as the period of the nanostructures in the coupling-in structure 221.

[0054] The virtual-real fusion space transparent display system provided in this embodiment has a certain observation range, that is, the observer can move left or right or forward and backward at a certain position in front of the screen and can see the image, so the nanostructure in the coupling structure 222 needs to be set accordingly. Figure 7 , assuming that the period of the nanostructure in the outcoupling region closest to the incoupling region is P1, and the period of the nanostructure farthest from the incoupling region is P n , the period of the nanostructures in the coupling-in region is consistent, both are P, then the period of the nanostructure in the middle of the coupling-out region is also P, that is, consistent with the period of the nanostructure in the coupling-in region, and the period of the nanostructure in the coupling-out structure 222 gradually increases from the direction away from the coupling-in structure 221, that is, P1 <P2<…<P<…<P n Thus, the reverse extension line of the emitted diffracted light can be converged to the set depth plane.

[0055] Figure 8 A situation with m transparent nano display screens is shown, in which case the periodicity values ​​of the nanostructures in the outcoupling regions of the transparent nano display screens can be set to be different, so that each transparent display screen has a corresponding depth plane, and there are m depth planes in total.

[0056] In one embodiment, the periods of the nanostructures in the coupling structure 221 are inconsistent, the period of the nanostructures in the coupling structure 221 gradually increases from the direction close to the coupling structure 222, the period of the nanostructures in the coupling structure 222 gradually increases from the direction away from the coupling structure 221, and the period of the nanostructures in the middle position of the coupling structure 222 is the same as the period of the nanostructures in the middle position of the coupling structure 221. That is, the period of the nanostructures in the coupling structure 221 can also be changed. For example, referring to Fig. 9 The period of the nanostructure in the out-coupling region closest to the in-coupling region is P1, and the period of the nanostructure farthest from the in-coupling region is P n , the period of the nanostructure at the middle position is P, P1 <P2<…<P<…<P n The period of the nanostructure farthest from the outcoupling structure 222 in the coupling structure 221 is P a1 , the period of the nanostructure closest to the outcoupling structure 222 is P an , the period of the nanostructure at the middle position is also P, P a1 <P a2 <… <P<…<P an .

[0057] Due to the change of the nanostructure period in the coupling structure 221, the light of a single pixel irradiated from the image generating device 100 also needs to be adaptively modulated to meet the total reflection conduction of parallel light in the waveguide. It should be noted that in this embodiment, the periodic transition in a strict sense is not a linear change, and needs to be calculated and generated one by one based on the fixed pupil width, depth distance, incident wavelength, etc.

[0058] In one embodiment, different transparent nano display screens receive different input lights generated by the image generating device 100 to display images of different parts of the full field of view at different depth planes.

[0059] When the application scenario requires displaying image information at different depths, the controller can control the image generating device 100 to output different input lights to different transparent nano-display screens, respectively, so as to display images of different parts of the complete field of view on different depth planes. For example, the controller controls the image generating device 100 to output the lower half of the image light of the complete field of view to the first transparent nano-display screen, so as to display it at the first depth plane. At the same time, the controller controls the image generating device 100 to output the upper half of the image light of the complete field of view to the second transparent nano-display screen, so as to display it at the second depth plane. Thus, different information displayed at different depth planes will not overlap when projected on the plane, so as to avoid the overlap of the perceived display content caused by the overlap of the image space.

[0060] Reference Fig.10 and Fig.11 When different transparent nano display screens need to receive different input lights, different transparent nano display screens may correspond to different image generating devices 100. That is, each image generating device 100 provides the required input light for each transparent nano display screen.

[0061] Reference Fig.11 When there are multiple image generating devices 100, two adjacent transparent nano-display screens and their corresponding image generating devices 100 can be symmetrically arranged, wherein the image generating device 100 corresponding to one transparent nano-display screen is distributed on the side of the transparent nano-display screen facing away from the other transparent nano-display screen, and a light isolation layer 230 is arranged between the two adjacent transparent nano-display screens. The arrangement of the light isolation layer 230 can avoid interference between the input lights of the image generating devices 100 corresponding to the two adjacent transparent nano-display screens. For example, Fig.11 In the embodiment, a light isolation layer 230 is disposed between the first transparent nano-display screen 200a and the second transparent nano-display screen 200b, and the image generating device 100 corresponding to the first transparent nano-display screen 200a and the image generating device 100 corresponding to the second transparent nano-display screen 200b are symmetrically disposed on the outside.

[0062] In one embodiment, referring to Fig.12 Different transparent nano-display screens correspond to the same image generating device 100, and the image generating device 100 is provided with a spectroscopic modulation unit, and the spectroscopic modulation unit is used to generate different input lights for different transparent nano-display screens. That is, different transparent nano-display screens can share the same image generating device 100. In this case, a spectroscopic modulation unit can be provided in the image generating device 100 through optical design. When it is necessary to provide the input light required by each transparent nano-display screen, the controller controls the spectroscopic modulation unit to perform optical modulation to output the corresponding light to the corresponding transparent nano-display screen. For example, Fig.12 In the embodiment, the first transparent nano-display screen 200a and the second transparent nano-display screen 200b share the same image generating device 100, and the image generating device 100 is provided with a light splitting modulation unit to provide corresponding light to the first transparent nano-display screen 200a and the second transparent nano-display screen 200b respectively.

[0063] In this embodiment, the transparent nano display screen can be manufactured by a nanostructure processing technology, such as electron beam lithography, ion beam lithography, projection lithography and other processes, and can also be manufactured by holographic exposure, interference exposure and other processing methods. Assuming that the electron beam lithography process is used, the lithography width needs to be set for different positions. In addition, if the format of the processing technology is not enough to support product production, the format combination can also be achieved through the nano-imprinting platemaking process.

[0064] Fig.13 A comparative example is shown in the figure, which uses a correction lens group to achieve the change of imaging depth. A negative lens is used on the side close to the human eye. At this time, the light passing through the transparent nano display screen is diverged by the negative lens to achieve a similar imaging effect at different depths. A positive lens is used on the side away from the human eye to achieve imaging correction of ambient light and avoid phase difference caused by the environment passing through the device. This method can also achieve imaging display of multiple depth planes, but the volume problem of the correction lens group is often difficult to take into account and cannot be miniaturized.

[0065] This utility model is based on a transparent nano display screen, which realizes the precise expansion and modulation of the image light field in a transparent waveguide and imaging in space. The virtual-reality fusion spatial transparent display has both the morphological characteristics of a plane display and the interactive function of virtual-reality fusion. Compared with traditional flat-panel displays, its long-distance imaging is enough to display a display frame of more than 100 inches in space; compared with wearable devices, because its image is focused at a farther position, long-term naked eye observation is equivalent to looking into the distance, which helps to protect the eyes. Combined with intelligent interaction and scene fusion video processing technology, the virtual-reality fusion spatial transparent display can achieve more realistic and larger scene spatial fusion.

[0066] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0067] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A virtual-real fusion space transparent display system, characterized in that: It includes an image generating device and at least two transparent nano display screens; The transparent nano display screen includes a transparent waveguide substrate, and a coupling-in structure and a coupling-out structure arranged on the surface or inside of the transparent waveguide substrate, wherein the coupling-in structure is configured to receive input light generated by the image generating device and couple the input light to the transparent waveguide substrate so that the input light is totally reflected and conducted in the transparent waveguide substrate, and the coupling-out structure is configured to couple at least part of the light waveguided in the transparent waveguide substrate out of the transparent waveguide substrate by diffraction; For the same transparent nano display screen, the reverse extension lines of the diffracted light coupled out of the transparent waveguide substrate converge to the same depth plane, and different transparent nano display screens correspond to different depth planes.

2. The virtual-reality fusion space transparent display system according to claim 1, characterized in that: The coupling-in structure and the coupling-out structure both include periodically arranged nanostructures.

3. The virtual-reality fusion space transparent display system according to claim 2 is characterized in that: The periodic arrangement of the nanostructures in the outcoupling regions of each transparent nano display screen corresponding to different depth planes is different.

4. The virtual-reality fusion space transparent display system according to claim 2, characterized in that: For some of the transparent nano display screens, the periods of the nano structures in the out-coupling structures are consistent.

5. The virtual-reality fusion space transparent display system according to claim 2, characterized in that: For some of the transparent nano display screens, the periods of the nano structures in the outcoupling structure are inconsistent.

6. The virtual-reality fusion space transparent display system according to claim 5, characterized in that: The period of the nanostructures in the coupling-in structure is consistent, the period of the nanostructures in the coupling-out structure gradually increases from the direction away from the coupling-in structure, and the period of the nanostructures in the middle position of the coupling-out structure is the same as the period of the nanostructures in the coupling-in structure.

7. The virtual-reality fusion space transparent display system according to claim 5, characterized in that: The periods of the nanostructures in the coupling-in structure are inconsistent. The period of the nanostructures in the coupling-in structure gradually increases from the direction approaching the coupling-out structure, and the period of the nanostructures in the coupling-out structure gradually increases from the direction away from the coupling-in structure. The period of the nanostructures in the middle position of the coupling-out structure is the same as the period of the nanostructures in the middle position of the coupling-in structure.

8. The virtual-reality fusion space transparent display system according to claim 1, characterized in that: Different transparent nano display screens receive different input lights generated by the image generating device to display images of different parts of the complete field of view at different depth planes.

9. The virtual-reality fusion space transparent display system according to claim 1, characterized in that: Different transparent nano display screens correspond to different image generating devices; Two adjacent transparent nano-display screens and their corresponding image generating devices are symmetrically arranged, wherein the image generating device corresponding to one transparent nano-display screen is distributed on the side of the transparent nano-display screen facing away from the other transparent nano-display screen; Wherein, a light isolation layer is arranged between two adjacent transparent nano display screens.

10. The virtual-reality fusion space transparent display system according to claim 8, characterized in that: Different transparent nano display screens correspond to the same image generating device, and a light splitting modulation unit is arranged in the image generating device, and the light splitting modulation unit is used to generate different input lights for different transparent nano display screens.

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