CN110727192A - Large-size holographic display device - Google Patents
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- CN110727192A CN110727192A CN201910971909.4A CN201910971909A CN110727192A CN 110727192 A CN110727192 A CN 110727192A CN 201910971909 A CN201910971909 A CN 201910971909A CN 110727192 A CN110727192 A CN 110727192A
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- 238000002310 reflectometry Methods 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 3
- 238000005286 illumination Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
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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
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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
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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
- G03H1/2286—Particular reconstruction light ; Beam properties
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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
- G03H2001/2207—Spatial filter, e.g. for suppressing higher diffraction orders
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Abstract
The embodiment of the application discloses a large-size holographic display device, which comprises a light source unit, a filtering unit, a light beam expansion unit, a collimation unit and a display panel, wherein the filtering unit is used for forming a first spherical wave which is uniformly dispersed from a light beam emitted from the light source unit; the light beam expanding unit is used for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than that of the first spherical wave; the collimation unit is used for collimating the second spherical waves into parallel light beams; and the display panel is used for receiving the parallel light beams and displaying the holographic image according to the parallel light beams. The holographic display device disclosed by the application utilizes the collimation unit to generate the large-caliber parallel light beam, so that the reconstruction light irradiation of a large-size display panel is realized, and the volume and the weight of a reconstruction system are reduced.
Description
Technical Field
The application relates to the field of display, in particular to a large-size holographic display device.
Background
Conventional holographic displays use a Spatial Light Modulator (SLM) for optical modulation, however, the panel size of the SLM is affected by the pixel pitch and the number of pixels, so that the size of a three-dimensional display scene is limited to a few millimeters or a few centimeters.
In order to reconstruct a large-sized three-dimensional scene, holographic display research is carried out by using a Liquid Crystal Display (LCD) panel instead of an SLM in the related art, however, the existing LCD display system is large and heavy, and even if the display system is more compact, the size of a reproduced image still does not meet the viewing requirement; in the study of holographic displays, in order to illuminate the entire large LCD display panel with parallel light, a common approach is to use a lens to expand the beam, or to use a high-speed scanning mechanism. When the lens is adopted to expand light to generate large-aperture parallel light, the lenses need to be overlapped, and the size and complexity of the system are increased undoubtedly.
Disclosure of Invention
The present application provides a large-sized holographic display device that solves at least one of the problems of the prior art.
To solve the above problems, in one aspect, the present application provides a large-sized holographic display device, which is characterized by comprising a light source unit, a filtering unit, a beam expanding unit, a collimating unit, and a display panel, wherein,
the filtering unit is used for forming the light beams emitted from the light source unit into uniformly divergent first spherical waves;
the light beam expanding unit is used for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than that of the first spherical wave;
the collimation unit is used for collimating the second spherical waves into parallel light beams;
and the display panel is used for receiving the parallel light beams and displaying the holographic image according to the parallel light beams.
Optionally, the filtering unit is a spatial filter array, the beam expanding unit is a beam expander array, and the collimating unit is a collimating lens array, where the spatial filter array, the beam expander array, and the collimating lens array correspond to each other one-to-one.
Optionally, the light source unit includes a light source and a light source beam splitter for splitting the light beam emitted from the light source into the same number of light beams as the number of devices in the spatial filter array.
Optionally, the filtering unit is a single spatial filter, the beam expanding unit is a single beam expander, and the collimating unit includes a single collimating lens and a beam splitter array for splitting the light beam irradiated thereon into a reflected light beam and a transmitted light beam for each beam splitter in the beam splitter array, wherein the reflected light beam irradiates the display panel.
Optionally, the orthographic projection of the beam splitter array in the direction of the reflected beam is seamless, and the plurality of beam splitters in the beam splitter array are non-overlapping in the direction of the reflected beam.
Optionally, in the direction of the light beam exiting from the single collimating lens, the ratio of the reflectivity and the transmissivity of the plurality of beam splitters in the beam splitter array sequentially increases, so that the light intensity difference of the reflected light beams of the plurality of beam splitters is within a preset range.
Optionally, the beam splitter has a reflectivity ofTransmittance of
Wherein N is the number of beam splitters in the beam splitter array, i is the serial number of the beam splitters along the beam irradiation direction, and i is a positive integer.
Optionally, the last beam splitter in the beam splitter array in the beam irradiation direction is a mirror.
Optionally, a plurality of beam splitters in the beam splitter array are arranged in parallel.
Optionally, the beam splitter in the beam splitter array includes any one of a semi-reflective and semi-transparent film lens, a plate-type beam splitter, a square-block-type beam splitter, a planar diffraction grating, a planar metamaterial microstructure, a planar two-dimensional material structure, a planar micro-nano optical element, and a planar diffractive optical element.
The application discloses a large-size holographic display device which comprises a light source unit, a filtering unit, a light beam expansion unit, a collimation unit and a display panel, wherein the filtering unit is used for forming a uniformly divergent first spherical wave for a light beam emitted from the light source unit; the light beam expanding unit is used for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than that of the first spherical wave; the collimation unit is used for collimating the second spherical waves into parallel light beams; and the display panel is used for receiving the parallel light beams and displaying the holographic image according to the parallel light beams. The holographic display device disclosed by the application utilizes the collimation unit to generate the large-caliber parallel light beam, so that the reconstruction light irradiation of a large-size display panel is realized, and the volume and the weight of a reconstruction system are reduced.
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 view of a large-scale holographic display device according to an embodiment of the present application;
FIG. 2 is a structural diagram of another large-sized holographic display device according to an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a collimating lens array in a large-sized holographic display device according to an embodiment of the present application;
FIG. 4 is a diagram showing another structure of a collimating lens array in a large-sized holographic display device according to an embodiment of the present application;
FIG. 5 is a structural diagram of another large-sized holographic display device according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a beam splitter array in an 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.
The large-size holographic display device provided by the embodiment of the application, as shown in fig. 1, includes a light source unit, a filtering unit, a light beam expanding unit, a collimating unit and a display panel, wherein the filtering unit is configured to form a first spherical wave uniformly diverging from a light beam emitted from the light source unit; the light beam expansion unit is used for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than that of the first spherical wave; the collimation unit is used for collimating the second spherical waves into parallel light beams; the display panel is used for receiving the parallel light beams and displaying a holographic image according to the parallel light beams.
Optionally, the light source unit comprises a laser light source.
Laser emitted by the laser source is uniformly dispersed into first spherical waves after passing through the filtering unit, the first spherical waves are expanded into second spherical waves after passing through the beam expanding unit, and the irradiation area of the second spherical waves is larger than that of the first spherical waves. It can be understood that the irradiation area is similar to the area of the final display panel, so that the irradiation area of the light beam can be enlarged to better irradiate the entire large-sized display panel.
The second spherical wave is collimated into a parallel beam after passing through the collimating unit, so that the display panel is irradiated better to form a holographic image. The display panel needs to load a pre-made hologram, and performs wavefront reconstruction according to the parallel beams to finally form a reconstructed holographic image.
According to the large-size holographic display device, the collimating unit is used for generating the large-caliber parallel light beams, so that the reconstruction light irradiation of the large-size display panel is realized, the volume and the weight of a reconstruction system are reduced, and the integration and the commercialization of the subsequent large-size holographic display system are facilitated.
The filtering unit, the beam expansion unit, and the collimating unit may be a spatial filter array, a beam expander array, and a collimating lens array, respectively, as shown in fig. 2, a structural diagram of a large-size display device according to an embodiment of the present application, where the spatial filter array, the beam expander array, and the collimating lens array correspond to each other in one-to-one correspondence.
The collimating lens in this embodiment is a thinner fresnel lens (as shown in fig. 3 and fig. 4), and may be other lenses or optical elements with smaller volume and collimating function, as long as the requirements of this application are met within the protection scope of this embodiment, and those skilled in the art can freely select them according to the actual situation, and this application is not limited specifically.
In the embodiment of the present application, the light source unit includes a light source and a light source beam splitter, the light source beam splitter is disposed in the light emitting direction of the light source, and the light source beam splitter is preferably configured to split the light beam emitted from the light source into the same number of light beams as the number of devices in the spatial filter array.
The dispersed light beams respectively irradiate each spatial filter in the spatial filter array, the light beams passing through each spatial filter irradiate each beam expander in the beam expander array, then the emergent light beams respectively pass through each collimating lens in the collimating lens array, and finally the emergent light beams irradiate into the display panel.
It is to be understood that "array" in the embodiments of the present application indicates that the number of devices is at least two.
In this embodiment of the application, the collimating lens array may be a plurality of collimating lenses arranged in sequence, such as the schematic diagram of the collimating lens array shown in fig. 3, or may be a plurality of collimating lenses arranged in a matrix manner, such as the schematic diagram of the collimating lens array shown in fig. 4. Preferably, the plurality of collimating lenses are arranged closely, so that emergent light beams are spliced closely, and the size of the holographic display device can be effectively reduced. Similarly, the arrangement of the spatial filter array and the beam expander array corresponds to the devices of the collimating lens one by one, that is, the spatial filter array, the beam expander array and the collimating lens array are all arranged in sequence or are all arranged in a matrix.
The present application also discloses a structural view of a holographic display of another embodiment, as shown in fig. 5. In this embodiment, the filter unit is a single spatial filter, the beam expanding unit is a single beam expander, and the collimating unit includes a single collimating lens and a beam splitter array for splitting the light beam irradiated thereto into a reflected light beam and a transmitted light beam for each beam splitter in the beam splitter array, wherein the reflected light beam irradiates the display panel. The display panel can be arranged at a reasonable position by those skilled in the art according to the above description.
The light source unit comprises a laser light source, light beams emitted from the laser light source are uniformly dispersed into first spherical waves after passing through a single spatial filter, the first spherical waves are expanded into second spherical waves after passing through the light beam expansion unit, then the second spherical waves are collimated into parallel light beams through a single collimating lens in collimation, and the parallel light beams are reflected into large-area parallel light beams to irradiate the display panel after passing through the beam splitter array.
In this embodiment, only an array of beam splitters is used, greatly reducing the architecture and complexity of the display device.
In addition, the orthographic projection of the beam splitter array in the embodiment along the reflected light beam direction is seamless, and the plurality of beam splitters in the beam splitter array do not overlap along the reflected light beam direction. That is, the reflected light beam after passing through the beam splitter array is a parallel light beam with uniform light intensity, and as shown in fig. 6, the angle of the plurality of beam splitters in the beam splitter array can be set and adjusted to ensure that the reflected light beam passing through the beam splitter array is a parallel light beam, and preferably, the plurality of beam splitters in the beam splitter array are arranged in parallel.
Further, along the direction of the light beam emitted from the single collimating lens, the ratio of the reflectivity and the transmissivity of the plurality of beam splitters in the beam splitter array is sequentially increased, so that the light intensity difference of the reflected light beams of the plurality of beam splitters is within a preset range. The predetermined range may be set empirically by one skilled in the art, and it is only necessary to ensure that the intensities of the reflected beams of each beam splitter are approximately equal.
Preferably, the reflected beams from each of the beam splitters are of equal intensity, this embodiment providing a method whereby each beam splitter has a reflectivity of
Transmittance of
And N is the number of beam splitters in the beam splitter array, i is the serial number of the beam splitters along the beam irradiation direction, and i is a positive integer.
As shown in fig. 6, the beam splitters are sequentially arranged along the direction of the light beam exiting from the single collimator lens (i.e. the initial incident light in the drawing), and the numbers of the beam splitters are 1, 2 and 3 … … 10 in sequence, taking the number of the beam splitters as 10 and the initial incident light intensity as 100 for example. The reflectivity of the first beam splitter is one tenth, the transmissivity of the first beam splitter is nine tenths, and accordingly, the reflected light intensity is 10, and the transmitted light intensity is 90; the reflectivity of the second beam splitter is one ninth, the transmissivity is eight ninth, correspondingly, the reflected light intensity is 10, and the transmitted light intensity is 80; the reflectivity of the third beam splitter is one eighth, the transmissivity of the third beam splitter is seven eighths, correspondingly, the reflected light intensity is 10, the transmitted light intensity is 70 … …, and the like, and finally the reflected light intensity of each beam splitter is 10.
Therefore, the light intensity of the parallel light beams irradiated to the display panel is uniform, and a better display effect is ensured.
In addition, the reflectivity of the last beam splitter in the beam splitter array is 100%, and the transmissivity is 0, that is, the beam splitter is a mirror.
It should be emphasized that the beam splitter in the beam splitter array in the embodiment of the present application includes any one of a half-reflecting and half-transmitting film lens, a plate-type beam splitter, and a square-block-type beam splitter, and may also be any one of a diffraction grating with a planar appearance, a metamaterial microstructure, a two-dimensional material structure, a micro-nano optical element, a diffractive optical element, and the like, which can flexibly adjust an energy ratio of a light beam.
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 (10)
1. A large-sized holographic display device, comprising a light source unit, a filtering unit, a beam expanding unit, a collimating unit, and a display panel, wherein,
the filtering unit is used for forming the light beams emitted from the light source unit into uniformly divergent first spherical waves;
the light beam expansion unit is used for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than that of the first spherical wave;
the collimation unit is used for collimating the second spherical wave into a parallel light beam;
the display panel is used for receiving the parallel light beams and displaying a holographic image according to the parallel light beams.
2. The holographic display of claim 1, in which the filtering unit is a spatial filter array, the beam expansion unit is a beam expander array, and the collimating unit is a collimating lens array, wherein the spatial filter array, the beam expander array, and the collimating lens array are in a one-to-one correspondence with one another.
3. The holographic display of claim 2, in which the light source unit comprises a light source and a light source beam splitter, wherein the light source beam splitter is configured to split a light beam emitted by the light source into the same number of light beams as the number of devices in the spatial filter array.
4. The holographic display of claim 1, in which the filtering unit is a single spatial filter, the beam expansion unit is a single beam expander, the collimating unit comprises a single collimating lens and an array of beam splitters,
for each beam splitter in the array of beam splitters, to split the light beam impinging thereon into a reflected light beam and a transmitted light beam, wherein the reflected light beam impinges the display panel.
5. The holographic display of claim 4, in which an orthographic projection of the array of beam splitters in the direction of the reflected beam is seamless, and a plurality of beam splitters in the array of beam splitters do not overlap in the direction of the reflected beam.
6. The holographic display of claim 4, in which, in the direction of the light beam exiting from the single collimating lens, the ratio of reflectivity and transmissivity of the plurality of beam splitters in the beam splitter array is sequentially increased such that the difference in intensity of the reflected light beams of the plurality of beam splitters is within a preset range.
7. Holographic display of claim 6, in which the reflectivity of the beam splitter is
Transmittance of
And N is the number of the beam splitters in the beam splitter array, i is the serial number of the beam splitters along the beam irradiation direction, and i is a positive integer.
8. Holographic display of any of claims 4-7, in which a last beam splitter in the array of beam splitters in a direction of beam illumination is a mirror.
9. The holographic display of any of claims 4-7, in which a plurality of beam splitters in the array of beam splitters are arranged in parallel.
10. The holographic display of any of claims 4 to 7, in which the beam splitters of the beam splitter array comprise any of a semi-reflective semi-transparent film lens, a plate beam splitter, a square block beam splitter, a planar diffraction grating, a planar metamaterial microstructure, a planar two-dimensional material structure, a planar micro-nano optical element, a planar diffractive optical element.
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|---|---|---|---|---|
| CN109656118A (en) * | 2019-02-26 | 2019-04-19 | 京东方科技集团股份有限公司 | Holographic display and electronic equipment |
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