CN108490756B - Holographic display based on waveguide transmission - Google Patents
Holographic display based on waveguide transmission Download PDFInfo
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- CN108490756B CN108490756B CN201810170156.2A CN201810170156A CN108490756B CN 108490756 B CN108490756 B CN 108490756B CN 201810170156 A CN201810170156 A CN 201810170156A CN 108490756 B CN108490756 B CN 108490756B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 45
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims description 7
- 238000000576 coating method Methods 0.000 claims description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 229940056932 lead sulfide Drugs 0.000 claims description 3
- 229910052981 lead sulfide Inorganic materials 0.000 claims description 3
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 3
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 3
- 239000005304 optical glass Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 3
- 239000004417 polycarbonate Substances 0.000 claims description 3
- 229920000515 polycarbonate Polymers 0.000 claims description 3
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
- G03H1/2202—Reconstruction geometries or arrangements
- G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
- G03H2001/2207—Spatial filter, e.g. for suppressing higher diffraction orders
Abstract
The application relates to a holographic display based on waveguide transmission, which is characterized by comprising an optical waveguide, wherein the optical waveguide comprises a light incidence surface and a light emergence surface; a modulating element located at the optical waveguide light exit surface for modulating the exit light; and the spatial light modulator is positioned above the modulation element along the emergent light direction and is used for carrying out image reproduction on the preloaded hologram through the modulated emergent light. By adopting the optical waveguide material, the incident light is transmitted in the optical waveguide material instead of being transmitted in a free space, so that the large-size three-dimensional display is realized, the volume of the whole display is reduced, and the portability of the display is greatly improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a holographic display based on waveguide transmission.
Background
The three-dimensional real-time holographic display can truly reproduce the light wave complex amplitude of the original scene, can realize the three-dimensional display which accords with the watching habit of human eyes and has reality, and is called as the ultimate display technology, namely the three-dimensional television.
For a large-size and high-portability three-dimensional real-time holographic display system, when a display device is large enough, such as a television panel, in the three-dimensional real-time holographic display process, the illumination light on the television panel is collimated laser, which requires that a system for obtaining a large-area collimated laser light source is as compact as possible, i.e., the light collimated part in the system needs to be lightened and miniaturized, and the output of a large-area collimated coherent laser light source is realized.
However, the conventional collimating device for obtaining the output of the collimated laser beam needs various optical components such as a pinhole filter, a lens and a reflector, and has a large space size, so that the portability of the whole three-dimensional real-time holographic display system is greatly limited. And because of the size limitation of optical components, it is difficult to output large-area collimation coherent laser light source required by large-size three-dimensional real-time holographic display.
Disclosure of Invention
The present application provides a waveguide transmission based holographic display that solves at least one of the problems of the prior art.
To solve the above problem, an embodiment of the present application provides a waveguide transmission-based holographic display, including:
an optical waveguide including a light incident surface and a light exit surface;
a modulating element located at the optical waveguide light exit surface for modulating the exit light;
and the spatial light modulator is positioned above the modulation element along the emergent light direction and is used for carrying out image reproduction on the preloaded hologram through the modulated emergent light.
Further, a diverging device is included, the diverging device being located at the light incident surface of the optical waveguide, for diverging the incident light.
Further, the diverging device comprises a concave lens.
Further, the diverging means is integrally formed with the optical waveguide.
Further, the surface of the diverging device comprises a coating.
Further, the optical waveguide device also comprises a laser light source, wherein the laser light source is used for generating spherical waves incident into the optical waveguide; the modulation element is used for modulating the emergent light from spherical waves into plane waves.
Further, the material of the optical waveguide comprises any one of optical glass K9, polymethyl methacrylate and polycarbonate plastic.
Further, the material of the coating film comprises any one of magnesium fluoride, titanium oxide and lead sulfide.
Further, the modulation element comprises any one of a micro-nano lens optical element, a holographic lens element and a Fresnel lens.
The embodiment of the application discloses a holographic display based on waveguide transmission, adopts optical waveguide materials to improve the output part of collimated coherent laser in the prior art, utilizes the total emission principle of light to enable the light to propagate inside the waveguide materials so as to replace the process of propagating in free space, modulates coherent laser beams at the incident and emergent positions of the waveguide materials, can reduce the volume of the whole display and greatly improve the portability of the display while realizing large-size three-dimensional real-time display.
Drawings
The features and advantages of the present application will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the present application in any way, and in which:
FIG. 1 is a schematic side perspective view of a holographic display according to a first embodiment of the present disclosure;
fig. 2 is a schematic perspective view of a holographic display according to a first embodiment of the present application;
FIG. 3 is a schematic side perspective view of a holographic display according to the second embodiment of the present application;
FIG. 4 is a schematic side perspective view of a holographic display according to a third embodiment of the present application;
fig. 5 is a schematic side perspective structural view of a holographic display according to a fourth embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
Example one
An embodiment of the application discloses a holographic display based on waveguide transmission, as shown in fig. 1 and fig. 2, where fig. 1 is a schematic side perspective structure diagram of the holographic display, and fig. 2 is a schematic perspective structure diagram of a micro-holographic display. The light guide comprises an optical waveguide 1, wherein the optical waveguide 1 comprises a light incidence surface 1-1, a light emergence surface 1-2 and a modulation element 2, and the modulation element 2 is positioned at the light emergence surface 1-2 of the optical waveguide and is used for modulating emergent light; and the spatial light modulator 3 is positioned above the modulation element 2 along the emergent light direction, and is used for carrying out image reconstruction on the preloaded hologram through the modulated emergent light.
The spherical incident light enters the optical waveguide 1 after being coupled on the light incident surface 1-1 of the optical waveguide, is emitted out on the light emitting surface 1-2 after being totally emitted in the optical waveguide, and enters the modulation element 2, the modulation element modulates the spherical wave into a plane wave, and then the plane wave enters the spatial light modulator 3, and the spatial light modulator utilizes the plane wave to reproduce the image of the hologram preloaded in the spatial light modulator, so as to generate a holographic three-dimensional image.
The hologram of the target image needs to be loaded into the spatial light modulator 3 in advance, and is refreshed in real time, and the three-dimensional image is displayed at the output end of the spatial light modulator.
It will be appreciated that the modulating element and the spatial light modulator need not be in close proximity, but rather are held at a distance that prevents rubbing and damage to the element.
The incident light is required to be laser light, and the incident light is generated by the laser light source 4. The material of the optical waveguide comprises any one of optical glass K9, polymethyl methacrylate and polycarbonate plastic. The modulation element comprises any one of a micro-nano lens optical element, a holographic lens element and a Fresnel lens. Of course, other optical waveguide materials and modulation elements that meet the requirements of the present embodiment are not further limited herein.
The holographic display based on waveguide transmission disclosed by the embodiment adopts the optical waveguide material to improve the output part of collimated coherent laser in the prior art, utilizes the full-emission principle of light to enable the light to be transmitted inside the waveguide material so as to replace the transmission process in a free space, modulates coherent laser beams at the incident and emergent positions of the waveguide material, can realize large-size three-dimensional real-time display, simultaneously reduces the volume of the whole display, and greatly improves the portability of the display.
Example two
The embodiment discloses a holographic display based on waveguide transmission, as shown in fig. 3, comprising an optical waveguide 1, wherein the optical waveguide 1 comprises a light incident surface 1-1 and a light emergent surface 1-2, and a modulation element 2, the modulation element 2 is located at the light emergent surface 1-2 of the optical waveguide and is used for modulating emergent light; and the spatial light modulator 3 is positioned above the modulation element 2 along the emergent light direction, and is used for carrying out image reconstruction on the preloaded hologram through the modulated emergent light.
Further, the present embodiment further includes a diverging device 5, which is located at the light incident surface 1-1 of the light guide 1, and can further diverge the incident light generated by the light source 4, thereby improving the display effect.
Optionally, the diverging element includes a concave lens, and of course, other diverging elements capable of satisfying the embodiment are also possible, and are not limited herein.
The holographic display based on waveguide transmission disclosed by the embodiment adopts the optical waveguide material to improve the output part of collimated coherent laser in the prior art, utilizes the full-emission principle of light to enable the light to be transmitted inside the waveguide material so as to replace the transmission process in a free space, modulates coherent laser beams at the incident and emergent positions of the waveguide material, can realize large-size three-dimensional real-time display, simultaneously reduces the volume of the whole display, and greatly improves the portability of the display.
The light incident surface of the light guide is provided with the divergence element, so that the incident light is further diverged, and the display effect is improved.
EXAMPLE III
The embodiment discloses a holographic display based on waveguide transmission, as shown in fig. 4, comprising an optical waveguide 1, wherein the optical waveguide 1 comprises a light incident surface 1-1 and a light emergent surface 1-2, and a modulation element 2, the modulation element 2 is located at the light emergent surface 1-2 of the optical waveguide and is used for modulating emergent light; and the spatial light modulator 3 is positioned above the modulation element 2 along the emergent light direction, and is used for carrying out image reconstruction on the preloaded hologram through the modulated emergent light.
Further, the present embodiment further includes a diverging device 5, which is located at the light incident surface 1-1 of the light guide 1, and can further diverge the incident light generated by the light source 4, thereby improving the display effect.
Compared with the embodiment, in the embodiment, the diverging element 5 is closely attached to the optical waveguide 1, and preferably, the two are integrally formed, that is, the light incident surface of the optical waveguide is polished to be a concave surface, so that the diverging element is used, not only the purpose of further diverging the incident light is achieved, but also the trouble of additionally adding elements is omitted, and the structure of the holographic display is simpler.
The holographic display based on waveguide transmission disclosed by the embodiment adopts the optical waveguide material to improve the output part of collimated coherent laser in the prior art, utilizes the full-emission principle of light to enable the light to be transmitted inside the waveguide material so as to replace the transmission process in a free space, modulates coherent laser beams at the incident and emergent positions of the waveguide material, can realize large-size three-dimensional real-time display, simultaneously reduces the volume of the whole display, and greatly improves the portability of the display.
The light incident surface of the optical waveguide is polished into a concave surface as a divergent element, so that the purpose of further diverging the incident light is realized, the trouble of additionally adding elements is also saved, and the structure of the holographic display is simpler.
Example four
As shown in fig. 5, on the basis of the holographic display disclosed in the third embodiment, a layer of coating is added on the surface of the divergent element 5, so that reflection can be reduced, projection can be increased, the utilization rate of light can be improved, and the display effect can be improved.
Optionally, the material of the coating film comprises any one of magnesium fluoride, titanium oxide and lead sulfide. Other materials capable of realizing the functions of the present embodiment are also possible, and are not limited herein.
The holographic display disclosed by the embodiment not only adopts the optical waveguide material to improve the output part of the collimated coherent laser in the prior art, reduces the volume of the whole display and improves the convenience, but also improves the utilization rate of light and the display effect by adding a layer of coating film on the light incidence surface of the optical waveguide.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. A waveguide transmission based holographic display, comprising:
an optical waveguide including a light incident surface and a light exit surface;
a modulating element located at the optical waveguide light exit surface for modulating the exit light;
the spatial light modulator is positioned above the modulation element along the emergent light direction and used for carrying out image reconstruction on the preloaded hologram through the modulated emergent light;
the holographic display further comprises a laser light source and a divergence device, the laser light source is used for generating spherical waves incident into the optical waveguide;
the modulation element is used for modulating the emergent light from spherical waves into plane waves;
the diverging device is located at a light incident surface of the optical waveguide, and is configured to diverge incident light.
2. The holographic display of claim 1, in which the diverging device comprises a concave lens.
3. The holographic display of claim 1, in which the diverging device is integrally formed with the optical waveguide.
4. The holographic display of claim 3, in which the diffuser surface comprises a coating.
5. The holographic display of claim 1, in which the material of the light guide comprises any one of optical glass K9, polymethylmethacrylate, and polycarbonate plastic.
6. The holographic display of claim 4, in which the material of the coating comprises any one of magnesium fluoride, titanium oxide, and lead sulfide.
7. The holographic display of claim 1, in which the modulation element comprises any one of a micro-nano lens optical element, a holographic lens element, a fresnel lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810170156.2A CN108490756B (en) | 2018-03-01 | 2018-03-01 | Holographic display based on waveguide transmission |
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| CN201810170156.2A CN108490756B (en) | 2018-03-01 | 2018-03-01 | Holographic display based on waveguide transmission |
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| CN108490756A CN108490756A (en) | 2018-09-04 |
| CN108490756B true CN108490756B (en) | 2022-03-25 |
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| CN109656118B (en) * | 2019-02-26 | 2021-08-24 | 京东方科技集团股份有限公司 | Holographic display device and electronic apparatus |
| GB2594356A (en) * | 2020-03-24 | 2021-10-27 | Bae Systems Plc | Optical system |
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| CN102809918A (en) * | 2012-08-08 | 2012-12-05 | 浙江大学 | High-resolution holographic three-dimensional display device and high-resolution holographic three-dimensional display method on basis of multilayer spatial light modulator |
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| CN105938318A (en) * | 2016-05-30 | 2016-09-14 | 苏州大学 | Time-division multiplexing-based color holographic three-dimensional display method and system |
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