Display system

Abstract

The utility model provides a display system. The display system comprises: an image device configured to generate light carrying image information; and at least one transparent nano light field screen, wherein the transparent nano light field screen is provided with 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 light rays projected by the image device and enable the light rays to be totally reflected and conducted in the transparent waveguide substrate; the coupling-out structure is configured to couple the light transmitted in the transparent waveguide substrate out of the transparent waveguide substrate and converge the coupled-out light to a first depth plane or converge a reverse extension line of the coupled-out light to a second depth plane; wherein the second depth plane is different from the first depth plane. According to the display system, the depth plane imaging in front of or behind the screen can be realized through the transparent nano light field screen, so that the fusion display of real space and virtual-real imaging is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a 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. The advent of the metaverse era has driven disruptive changes in display methods in multiple fields and industries.

[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. Utility Model Content

[0004] Based on this, the present invention aims to provide an improved display system to solve at least one of the above problems.

[0005] In a first aspect, the present application provides a display system, comprising:

[0006] an image device configured to generate light carrying image information; and

[0007] at least one transparent nano-light field screen;

[0008] The transparent nano light field screen has 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. The coupling-in structure is configured to receive the light projected by the image device and make the light be totally reflected and transmitted in the transparent waveguide substrate. The coupling-out structure is configured to couple the light transmitted in the transparent waveguide substrate out of the transparent waveguide substrate and make the coupled-out light converge to a first depth plane or the reverse extension line of the coupled-out light converge to a second depth plane; wherein the second depth plane is different from the first depth plane.

[0009] The above display system has at least the following beneficial effects:

[0010] 1. Through the transparent nano-light field screen, deep plane imaging can be achieved in front of or behind the screen, realizing the fusion display of "real space" and "virtual and real imaging";

[0011] 2. The display frame of the transparent nano light field screen is less restricted by the actual display device size, which is conducive to the realization of large-format display of over 100 inches;

[0012] 3. The transparent nano light field screen uses the coupling structure and the coupling structure to conduct light while coupling out and modulate the coupled out light synchronously, which is conducive to the precise expansion and modulation of the image light field in the transparent waveguide substrate and the realization of customized spatial imaging effect;

[0013] 4. The transparent nano light field screen has a flat panel display form. Observers do not need to wear any equipment and can observe the virtual and real fusion in the way of conventional flat panel display, which is conducive to adapting to a variety of display scenarios;

[0014] 5. Combining the above-mentioned effects is conducive to combining intelligent interaction and scene fusion video processing technology to achieve a new display mode that is diversified, intelligent, and interactively integrates full-space virtual reality and real scenes.

[0015] In one embodiment, the outcoupling structure has a first structural parameter, and the first structural parameter is configured to make the outcoupling angles of the outcoupling light coupled through at least two different positions of the outcoupling structure different, wherein the outcoupling angle represents the angle formed by the propagation direction of the outcoupling light when coupled through the outcoupling structure and the surface of the outcoupling structure.

[0016] In one embodiment, the out-coupling structure includes a first nano-diffraction grating, and the out-coupling structure has a first structural parameter, and the first structural parameter includes a period of the first nano-diffraction grating; wherein, when the period of the first nano-diffraction grating gradually decreases in a direction away from the coupling-in structure, the out-coupled light converges to the first depth plane; and when the period of the first nano-diffraction grating gradually increases, the reverse extension line of the out-coupled light converges to the second depth plane.

[0017] In one embodiment, the coupling-in structure includes a second nano-diffraction grating with a fixed period, and the period of the nano-structure at the middle position of the first nano-diffraction grating is the same as the period of the second nano-diffraction grating.

[0018] In one embodiment, the coupling-in structure comprises a second nano-diffraction grating having a fixed period, and the period of the nano-structure at least in the middle of the first nano-diffraction grating is different from the period of the second nano-diffraction grating.

[0019] In one embodiment, the display system includes a plurality of transparent nano-light field screens, and different transparent nano-light field screens have correspondingly different depth planes.

[0020] In one embodiment, the display system has a first side and a second side opposite to each other, wherein at least part of the outcoupled light of the transparent nano-light field screen converges to the first side, and the reverse extension line of the outcoupled light of at least part of the transparent nano-light field screen converges to the second side.

[0021] In one embodiment, the coupling structure has a second structural parameter, and the second structural parameter is configured to convert light coupled in at different coupling angles into parallel light and conduct it through total reflection in the transparent waveguide substrate.

[0022] In one embodiment, the coupling-in structure includes a third nano-diffraction grating, and the second structural parameter includes a period of the third nano-diffraction grating, wherein the period of the third nano-diffraction grating gradually increases or decreases along a direction approaching the coupling-out structure.

[0023] In one embodiment, the depth plane is located in a target imaging area of ​​the transparent nano-light field screen, the target imaging area has a first boundary closest to the display system and a second boundary farthest from the display system, and the distance between the first boundary and the second boundary is less than or equal to a limiting resolution width. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of this specification or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A schematic diagram of the structure of a display system according to an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the structure of a display system according to an embodiment of the present application;

[0027] Figure 3 A display schematic diagram of a display system according to an embodiment of the present application;

[0028] Figure 4 A display schematic diagram of a display system according to an embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a display system according to an embodiment of the present invention is provided;

[0030] Figure 6 The target imaging area of ​​one embodiment of the present application is shown;

[0031] Figure 7 A schematic diagram of light transmission of a transparent nano-light field screen according to an embodiment of the present application;

[0032] Figure 8 A schematic diagram of imaging simulation of a display system according to an embodiment of the present application;

[0033] Fig. 9 A schematic diagram of light transmission of a transparent nano-light field screen according to an embodiment of the present application;

[0034] Fig.10 A schematic diagram of light transmission of a transparent nano-light field screen according to an embodiment of the present application;

[0035] Fig.11 A schematic diagram of imaging simulation of a display system according to an embodiment of the present application;

[0036] Fig.12 A display schematic diagram of a display system according to an embodiment of the present application;

[0037] Fig.13 Schematic diagram of light transmission of a transparent nano-light field screen according to an embodiment of the present application.

[0038] Component number description:

[0039] 100. Display system, 110. Image device, 120. Transparent nano-light field screen, 121. Transparent waveguide substrate, 122. Incoupling structure, 123. Outcoupling structure, 120', transparent nano-light field screen, 123', outcoupling structure. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0042] In addition, 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, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0044] 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. The advent of the metaverse era has led to disruptive changes in display methods in multiple fields and industries. Many technology giants are competing to invest in the development of new display technologies. For example, the AR / MR head-mounted display device developed by Microsoft is hailed as the next generation of smart display terminals, which has the function of superimposing virtual information in real space; Apple, Huawei, Oppo and other companies have also developed AR display devices. However, near-eye AR requires consumers to wear the device on their heads, which is inconvenient to use to a certain extent.

[0045] In addition, many manufacturers have developed transparent displays, that is, displaying images on a transparent screen under visible light. You can see the information on the screen and the real space through the screen. This has great applications in exhibitions, smart displays and other fields. But it is still essentially a flat panel display 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 exhibitions. However, in order to achieve a 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.

[0046] Based on the above problems, the embodiments of the present application provide a new display system, which can perform deep plane imaging in front of or behind the screen through a transparent nano-light field screen, thereby realizing the fusion display of "real space" and "virtual and real imaging".

[0047] like Figure 1 and Figure 2As shown, the embodiment of the present application provides a display system 100, including an image device 110, which is configured to generate light carrying image information; and at least one transparent nano-light field screen 120; wherein the transparent nano-light field screen 120 has a transparent waveguide substrate 121 and a coupling-in structure 122 and a coupling-out structure 123 arranged on the surface or inside of the transparent waveguide substrate 121, the coupling-in structure 122 is configured to receive the light projected by the image device 110 and make the light be totally reflected and transmitted in the transparent waveguide substrate 121, and the coupling-out structure 123 is configured to couple the light transmitted in the transparent waveguide substrate 121 out of the transparent waveguide substrate 121, and make the coupled-out light converge to a first depth plane or the reverse extension line of the coupled-out light converge to a second depth plane; wherein the second depth plane is different from the first depth plane.

[0048] like Figure 3 and Figure 4 As shown, the transparent nano light field screen 120 can be used to perform deep plane imaging in front of or behind the screen, thereby realizing the fusion display of "real space" and "virtual and real imaging"; and the display frame of the transparent nano light field screen 120 is less constrained by the actual display device size, which is conducive to realizing large-format display of over 100 inches; at the same time, the transparent nano light field screen 120 is in the form of a transparent flat panel, and the observer does not need to wear any equipment, and can observe the virtual and real fusion in the way of observing a conventional flat panel, which is conducive to adapting to a variety of display scenes; finally, the above-mentioned display system 100 can also be combined with intelligent interaction and scene fusion video processing technology to achieve more realistic and larger scene space fusion, for example, with the virtual and real space display fusion of urban CBD occasions, so as to realize diversified, intelligent, virtual reality and real scene interactive fusion new display mode in many fields such as science and technology display, museum exhibition, smart city, education and entertainment, and vehicle display under the general trend of the development of the metaverse.

[0049] Exemplarily, the image device 110 is used to provide image information, thereby generating input light that enters the transparent nano light field screen 120. Optionally, the image device 110 may include a lighting module, a projection module, and a driving module. Among them, the lighting module is used to realize the input of the light source, and its lighting method can be a light emitting diode (LED), an organic light emitting diode (OLED, laser light source, etc.); the projection module is used to realize the image light design output, and its image source method can be digital light processing (DLP) technology, liquid crystal display (LCD) technology, optical micro-electro-mechanical system (MEMS) technology, etc.; the driving module can be used to control the input and output of the image signal. The overall form of the image device 110 can be designed to be small in size according to the requirements of the specific scene.

[0050] Exemplarily, the transparent nano-light field screen 120 is used to receive the input light carrying the image information projected by the image device 110, so that the input light is coupled and conducted in the transparent waveguide substrate 121 and coupled out. Optionally, the input light can be conducted in the transparent waveguide substrate 121 by total reflection. Optionally, the transparent nano-light field screen 120 has a high transmittance under visible light, for example, its transmittance can be not less than 70%. Optionally, the number of transparent nano-light field screens 120 can be one or more. When the number of transparent nano-light field screens 120 is one, the image can be observed in front of or behind the transparent nano-light field screen 120.

[0051] Exemplarily, the coupling-in structure 122 and the coupling-out structure 123 may be composed of a structure or material having diffraction characteristics, and may be distributed on the surface or inside of the transparent waveguide substrate 121. When distributed on the surface of the transparent waveguide substrate 121, the coupling-in structure 122 and the coupling-out structure 123 may be distributed on the same side surface of the transparent waveguide substrate 121, or may be located on the opposite side surfaces of the transparent waveguide substrate 121. Optionally, the coupling-in structure 122 and the coupling-out structure 123 may be nano-diffraction gratings, so that the incident light may be emitted at a certain diffraction angle to propagate on a designed path.

[0052] For example, Figure 1 As shown, if the outcoupled light from the transparent waveguide substrate 121 converges to the first depth plane 1, the observer can see the corresponding suspended image on the same side of the transparent nano-light field screen 120, as shown in FIG. Figure 2As shown, if the outcoupled light coupled out from the transparent waveguide substrate 121 is diffuse, and its reverse extension line converges to the second depth plane 2 , the observer can see the corresponding suspended image on the other side of the transparent nano-light field screen 120 .

[0053] Exemplarily, by setting different outcoupling structures 123, the outcoupling light can be converged to depth planes at different depths from the transparent nano-light field screen 120. Figure 1 , the outcoupled light can be converged to a depth plane 1 at a depth distance 1 from the outcoupled structure 123 of the transparent nano-light field screen 120 after being coupled out, see Figure 5 After being coupled out from the outcoupling structure 123 ′ of the transparent nano-light field screen 120 ′, the outcoupling light can converge to a third depth plane 3 at a depth distance 3 therefrom, wherein the depth distance 3 is less than the depth distance 1 .

[0054] Exemplarily, the depth plane is located in the target imaging area of ​​the transparent nano-light field screen, the target imaging area has a first boundary closest to the display system and a second boundary farthest from the display system, and the distance between the first boundary and the second boundary is less than or equal to a limiting resolution width. Figure 6 As shown, when the observer observes where the image is located, it depends on where the reverse extension line of the divergent light of a single pixel converges, but the limiting resolution of human eye observation is an angular resolution of 1', so the convergence position less than 1' can be considered as a clear display position, which corresponds to a certain limiting resolution width, that is, the depth plane in the embodiment of the present application can be located in the target imaging area M that meets the resolution conditions of the human eye, and the width of the target imaging area M can be the above-mentioned limiting resolution width.

[0055] In some embodiments of the present application, the outcoupling structure has a first structural parameter, and the first structural parameter is configured to make the outcoupling angles of the outcoupling light coupled through at least two different positions of the outcoupling structure different, wherein the outcoupling angle represents the angle between the propagation direction of the outcoupling light when coupled through the outcoupling structure and the surface of the outcoupling structure. At this time, the observer can see the image when moving left and right or forward and backward in front of the screen. Optionally, when the outcoupling structure is a nano-diffraction grating, the first structural parameter can be one or more of the grating constant (the distance between two adjacent lines), the groove width (the width of the lines in the grating), the groove depth (the depth of the lines in the grating), the duty cycle (the ratio of the groove width to the grating constant), the material, the size, and the diffraction efficiency.

[0056] Optional, such as Figure 7As shown, the image device 110 is not shown, and the parallel light (i.e., the coupled light) is coupled into the transparent waveguide substrate 121 through the coupling structure 122 and is totally reflected and conducted in the waveguide substrate, and finally coupled out through the coupling-out structure 123. Taking the nano-diffraction grating as an example, the first structural parameter may include the period P1, P2, P3, etc. of the nanostructures at different positions of the coupling-out structure. It can be understood that the period of a nanostructure is fixed, so the period of each nanostructure can be determined according to the spacing between two adjacent scribed lines in the nanostructure, and the period difference of adjacent nanostructures can be represented by ΔP (ΔP≠0). Optionally, the periods of the nanostructures at different positions are different, so that the period of the nanostructures at each position can be set according to the depth plane to which the coupled-out light from different positions converges.

[0057] Optional, such as Fig. 9 As shown, the image device 110 is not shown, the coupled light is coupled into the transparent waveguide substrate 121 through the coupling structure 122 and is totally reflected and conducted in the waveguide substrate, and finally coupled out through the coupling-out structure 123. Taking the nano-diffraction grating as an example, the first structural parameter may include the period P1, P2, P3, etc. of the nanostructures at different positions of the coupling-out structure, and the period difference of the nanostructures at adjacent positions may be represented by ΔP (ΔP≠0). Optionally, the periods at different positions are different, and the period of the nanostructures at each position may be set according to the depth plane to which the reverse extension lines of the coupling-out light coupled from different positions converge.

[0058] In some embodiments of the present application, Figure 1 As shown, the out-coupling structure 123 includes a first nano-diffraction grating, and the out-coupling structure 123 has a first structural parameter, and the first structural parameter includes a period of the first nano-diffraction grating; wherein, when the period of the first nano-diffraction grating gradually decreases in the direction away from the coupling-in structure 122, the out-coupled light converges to a first depth plane 1; when the period of the first nano-diffraction grating gradually increases, the reverse extension line of the out-coupled light converges to a second depth plane 2.

[0059] Optional, continue to see Figure 7 , the period of the nanostructure closest to the coupling structure 122 in the out-coupling structure 123 is P1, and the period of the nanostructure farthest from the coupling structure 122 is Pn, and the period of the nanostructure in the out-coupling structure 123 gradually decreases from the direction away from the coupling structure 122, that is, P1>P2>…>P>…>Pn, thereby, the out-coupled light can be converged to the corresponding depth plane, Figure 8 The spatial convergence simulation of light at three different coupling angles of -5°, 0°, and 5° is shown, where the transparent nano-light field screen 120 is at the bottom and the depth plane is located at the light convergence position. It can be seen that after being modulated by the outcoupling structure 123, the light at different coupling angles will converge at the depth plane in front of the screen and then diverge. Fig. 9 Among them, the period of the nanostructure closest to the coupling-in structure 122 in the coupling-out structure 123 is P1, and the period of the nanostructure farthest from the coupling-in structure 122 is Pn. Moreover, the period of the nanostructures in the coupling-out structure 123 gradually increases in the direction away from the coupling-in structure 122, that is, P1 < P2 <... < P <... < Pn. Thus, the reverse extension lines of the coupled-out light rays can converge to the corresponding depth plane. It should be noted that the period of the first nano-diffraction grating referred to in the embodiments of the present application may not change linearly, but can be calculated one by one for the nanostructures at different positions by determining the depth distance and the incident wavelength, etc.

[0060] In some embodiments of the present application, the coupling-in structure includes a second nano-diffraction grating with a fixed period, and the period of the nanostructure at the middle position of the first nano-diffraction grating is the same as that of the second nano-diffraction grating. Refer to Figure 7 and Fig. 9 , the period of the second nano-diffraction grating of the coupling-in structure 122 is fixed as P, and the period of the nanostructure at the middle position of the coupling-out structure 123 can also be P, that is, it is consistent with the period of the second nano-diffraction grating of the coupling-in structure 122. In this way, it is beneficial to ensure that the imaging screen faces the transparent nano-light field screen 120 directly.

[0061] In some embodiments of the present application, the coupling-in structure includes a second nano-diffraction grating with a fixed period, and at least the period of the nanostructure at the middle position of the first nano-diffraction grating is different from that of the second nano-diffraction grating. In this way, it is beneficial to make the depth plane oblique, so as to realize the flexible design of image suspension display without increasing the device volume.

[0062] Optionally, refer to Fig.10 , the period of the second nano-diffraction grating in the coupling-in structure 122 is fixed as P, and at least the period of the nanostructure at the middle position of the first nano-diffraction grating is not P, so that the depth plane where the coupled-out light rays converge is oblique. Fig.11 The simulation schematic diagram of the oblique depth plane is shown. It can be seen that by setting the periods of the nanostructures at different positions in the coupling-out structure 123, the coupled-out light rays can converge and form an image obliquely in space. Among them, "at least the period of the nanostructure at the middle position of the first nano-diffraction grating is not P" can be that the nanostructures with a period of P are in the front or rear of the first nano-diffraction grating, or the periods of the nanostructures at different positions in the first nano-diffraction grating are all greater than P or less than P, which can be specifically set according to the actual situation, and the present application does not limit this.

[0063] In some embodiments of the present application, the display system includes multiple transparent nano-light field screens, and different transparent nano-light field screens 120 correspond to different depth planes. Refer to Fig.12, the image device 110 is not shown, and the display system 100 may have m transparent nano-light field screens 120. In this case, the periods of the first nano-diffraction gratings of the outcoupling structures 123 in different transparent nano-light field screens 120 are set differently, so that each transparent nano-light field screen 120 has a corresponding depth plane, that is, there are m depth planes in total, so that the convergence points of the reverse extension lines of the light collected by the pupil can be different, thereby realizing stereoscopic display of multiple depth planes, and also realizing simultaneous display of the front and back of the screen of the suspended image.

[0064] Optionally, when stereoscopic display is realized, each transparent nano-light field screen 120 may be provided with an image device 110 corresponding thereto, and the image device 110 may project light carrying partial image information to the transparent nano-light field screen 120, so that the depth planes corresponding to the multiple transparent nano-light field screens 120 may be combined to display a stereoscopic image.

[0065] Optionally, when the suspended image is displayed simultaneously in front of and behind the screen, the display system 100 has a first side and a second side opposite to each other, wherein at least part (such as the first, second, and third layers) of the outcoupled light of the transparent nano-light field screen 120 converges to the first side, and at least part (such as the fourth, fifth, and sixth layers) of the outcoupled light of the transparent nano-light field screen 120 converges to the second side. Optionally, multiple transparent nano-light field screens 120 can be stacked, or arrayed, or a mixture of stacked and arrayed.

[0066] In some embodiments of the present application, the coupling structure has a second structural parameter, and the second structural parameter is configured to convert light coupled in at different coupling angles into parallel light to be totally reflected and guided in the transparent waveguide substrate. Fig.13 By setting the second structural parameters of the coupling structure 122, the light beams in different directions projected by the image device 110 can be modulated and converted into parallel light beams when coupled into the transparent waveguide substrate 121 and then fully reflected and conducted in the transparent waveguide substrate. This is conducive to adapting the light beams of various image pixels projected by the image device 110 and expanding the application scope of the transparent nano light field screen 120.

[0067] Further, the coupling structure 122 includes a third nano-diffraction grating, and the second structural parameter includes a period of the third nano-diffraction grating, wherein the period of the third nano-diffraction grating gradually increases or decreases along the direction close to the coupling structure 123. In other words, the period of the third nano-diffraction grating in the coupling structure 122 can be changed. Optionally, refer to Fig.13, the image device 110 is not shown. In the coupling-out structure 123, the period of the nanostructure closest to the coupling-in structure 122 is P1, the period of the nanostructure farthest from the coupling-in structure 122 is Pn, and the period of the nanostructure at the intermediate position is P, that is, P1 < P2 <... < P <... < Pn; in the coupling-in structure 122, the period of the nanostructure farthest from the coupling-out structure 123 is Pa1, the period of the nanostructure closest to the coupling-out structure 123 is Pan, and the period of the nanostructure at the intermediate position is also P, that is, Pa1 < Pa2 <... < P <... < Pan. In this way, light rays coupled in at different incident angles can be converted into parallel light rays and totally reflected and conducted in the transparent waveguide substrate 121. It should be noted that the period of the third nano-diffraction grating referred to in the embodiments of the present application may not change linearly, but can be calculated one by one for the nanostructures at different positions by determining the depth distance and the incident wavelength, etc.

[0068] In some embodiments of the present application, for the specific structural parameters of the nano-diffraction gratings in the above-mentioned coupling-in structure and coupling-out structure, after determining the position of the depth plane, the diffraction angle and azimuth angle corresponding to the light rays can be reversely calculated according to the vector grating equation, and then calculated in combination with the incident angle of the light rays.

[0069] The display system 100 of the present utility model displays image information at different depth positions in the real spaces in front of and behind the transparent nano-optical field screen 120 in a module form similar to a flat panel display, realizing deep integration with the real space. The transparent nano-optical field screen 120 is highly transparent under visible light, and the observer does not need to wear any device and observes the virtual-real fusion in the conventional flat panel display observation manner. The display image position can be in front of the screen or behind the screen. Through the combination of images at different depth positions, full-space stereoscopic display can be achieved.

[0070] It should be noted that the numbers representing quantities or properties used to describe and claim certain embodiments of the present application should be understood to be modified by the terms "substantially", "about", "approximate" or "essentially" in certain cases. For example, unless otherwise stated, "substantially", "about", "approximate" or "essentially" can indicate a ±20% variation of the value they describe. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are all approximate values, and such approximate values can change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used to confirm the breadth of their scope in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0071] 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.

[0072] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A display system, characterized in that: include: An imaging device configured to generate light carrying image information; as well as, at least one transparent nano-light field screen; The transparent nano light field screen has 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. The coupling-in structure is configured to receive the light projected by the image device and make the light be totally reflected and transmitted in the transparent waveguide substrate. The coupling-out structure is configured to couple the light transmitted in the transparent waveguide substrate out of the transparent waveguide substrate and make the coupled-out light converge to a first depth plane or the reverse extension line of the coupled-out light converge to a second depth plane; wherein the second depth plane is different from the first depth plane.

2. The display system according to claim 1, characterized in that: The outcoupling structure has a first structural parameter, which is configured to make the outcoupling angles of the outcoupling light coupled through at least two different positions of the outcoupling structure different, wherein the outcoupling angle represents the angle formed by the propagation direction of the outcoupling light when coupled through the outcoupling structure and the surface of the outcoupling structure.

3. The display system according to claim 1, characterized in that: The outcoupling structure comprises a first nano-diffraction grating, and the outcoupling structure has a first structural parameter, and the first structural parameter comprises a period of the first nano-diffraction grating; Wherein, when the period of the first nano-diffraction grating gradually decreases along the direction away from the coupling-in structure, the outcoupled light converges to the first depth plane; when the period of the first nano-diffraction grating gradually increases, the reverse extension line of the outcoupled light converges to the second depth plane.

4. The display system according to claim 3, characterized in that: The coupling-in structure includes a second nano-diffraction grating with a fixed period, and the period of the nano-structure at the middle position of the first nano-diffraction grating is the same as the period of the second nano-diffraction grating.

5. The display system according to claim 3, characterized in that: The coupling-in structure includes a second nano-diffraction grating having a fixed period, and the period of the nano-structure at least in the middle of the first nano-diffraction grating is different from the period of the second nano-diffraction grating.

6. The display system according to any one of claims 1 to 5, characterized in that: The display system includes a plurality of transparent nano-light field screens, and different transparent nano-light field screens have correspondingly different depth planes.

7. The display system according to claim 6, characterized in that: The display system has a first side and a second side opposite to each other, wherein outcoupled light from at least a portion of the transparent nano-light field screen converges to the first side, and reverse extension lines of the outcoupled light from at least a portion of the transparent nano-light field screen converge to the second side.

8. The display system according to any one of claims 1 to 3, characterized in that: The coupling structure has a second structural parameter configured to convert light coupled in at different coupling angles into parallel light and conduct it through total reflection in the transparent waveguide substrate.

9. The display system according to claim 8, characterized in that: The coupling-in structure includes a third nano-diffraction grating, and the second structural parameter includes a period of the third nano-diffraction grating, wherein the period of the third nano-diffraction grating gradually increases or decreases along a direction approaching the coupling-out structure.

10. The display system according to any one of claims 1 to 5, characterized in that: The depth plane is located in a target imaging region of the transparent nano-light field screen, the target imaging region has a first boundary closest to the display system and a second boundary farthest from the display system, and a distance between the first boundary and the second boundary is less than or equal to a limiting resolution width.

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