CN110727192A - Large-size holographic display device - Google Patents

Abstract

An embodiment of the present application discloses a large-size holographic display device, including a light source unit, a filter unit, a beam expansion unit, a collimation unit, and a display panel, wherein the filter unit is used to form a uniformly divergent first light beam emitted from the light source unit. a spherical wave; a beam expansion unit, used for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than the irradiation area of the first spherical wave; the collimation unit is used for expanding the first spherical wave The two spherical waves are collimated into parallel light beams; the display panel is used for receiving the parallel light beams and displaying holographic images according to the parallel light beams. The holographic display device disclosed in the present application utilizes the collimating unit to generate a large-diameter parallel light beam, which not only realizes the reproduction light irradiation to the large-sized display panel, but also reduces the volume and weight of the reproduction system.

Description

A large-scale holographic display device

technical field

The present application relates to the field of display, and in particular, to a large-size holographic display device.

Background technique

Traditional holographic displays use Spatial Light Modulator (SLM) for optical modulation. However, the panel size of SLM is affected by the pixel pitch and the number of pixels, so that the size of the 3D display scene is limited to a few millimeters or a few centimeters.

In order to reconstruct large-scale 3D scenes, there is a holographic display research using a liquid crystal display (LCD) panel instead of SLM in the related art. However, the existing LCD display system is bulky and cumbersome, and even with a relatively compact display system, the reproduced image cannot be The size still does not meet the viewing needs; in the research of holographic display, in order to illuminate the entire large LCD display panel with parallel light, the usual method is to use a lens to expand the beam, or to use a high-speed scanning mechanism. When using lens beam expander to generate large-diameter parallel light, lenses need to be superimposed, which undoubtedly increases the volume and complexity of the system.

SUMMARY OF THE INVENTION

The present application provides a large-size holographic display device, which at least solves at least one problem existing in the prior art.

In order to solve the above problems, on the one hand, a large-size holographic display device provided by the embodiment of the present application is characterized in that, the device includes a light source unit, a filter unit, a beam expansion unit, a collimation unit and a display panel, wherein,

a filtering unit for forming a uniformly divergent first spherical wave from the light beam emitted from the light source unit;

a beam expanding unit for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than the irradiation area of the first spherical wave;

a collimating unit for collimating the second spherical wave into a parallel beam;

The display panel is used for receiving the parallel light beam and displaying the holographic image according to the parallel light beam.

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, wherein the spatial filter array, the beam expander array and the collimating lens array are mutually One-to-one correspondence between devices.

Optionally, the light source unit includes a light source and a light source beam splitter, and the light source beam splitter is used for dispersing light beams emitted from the light source into light beams with the same number of devices as 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 each beam splitter in the beam splitter array, for The light beams irradiated thereon are divided into reflected light beams and transmitted light beams, wherein the reflected light beams illuminate the display panel.

Optionally, the orthographic projection of the beam splitter array along the reflected beam direction is seamless, and the multiple beam splitters in the beam splitter array do not overlap along the reflected beam direction.

Optionally, the ratios of reflectivity and transmittance of multiple beam splitters in the beam splitter array are sequentially increased along the direction of the beam exiting from a single collimating lens, so that the light intensity difference of the reflected beams of the multiple beam splitters is increased. within the preset range.

其中N为分束镜阵列中分束镜的数量，i为沿光束照射方向的分束镜的序号，i为正整数。Optionally, the reflectivity of the beam splitter is transmittance

where 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 along the beam irradiation direction in the beam splitter array is a reflecting 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 a semi-reflective and semi-transparent film lens, a plate beam splitter, a square beam splitter, a planar diffraction grating, a planar metamaterial microstructure, a planar two-dimensional Any one of material structure, planar micro-nano optical element, and planar diffractive optical element.

The large-scale holographic display device disclosed in the present application includes a light source unit, a filter unit, a beam expansion unit, a collimation unit and a display panel, wherein the filter unit is used to form a uniformly divergent first spherical wave from the light beam emitted from the light source unit a beam expansion unit for expanding the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than the irradiation area of the first spherical wave; the collimation unit is used for expanding the second spherical wave The collimation is a parallel beam; the display panel is used for receiving the parallel beam and displaying a holographic image according to the parallel beam. The holographic display device disclosed in the present application utilizes the collimating unit to generate a large-diameter parallel light beam, which not only realizes the reproduction light irradiation to the large-sized display panel, but also reduces the volume and weight of the reproduction system.

Description of drawings

The features and advantages of the present application will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be construed as limiting the present application in any way, in which:

FIG. 1 is a schematic diagram of a large-size holographic display device in an embodiment of the present application;

FIG. 2 is a structural diagram of another large-size holographic display device in an embodiment of the present application;

3 is a schematic structural diagram of a collimating lens array in a large-size holographic display device according to an embodiment of the present application;

4 is another structural diagram of the collimating lens array in the large-size holographic display device according to the embodiment of the present application;

FIG. 5 is a structural diagram of another large-size holographic display device in 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 ways

In order to more clearly understand the above objects, features and advantages of the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other in the case of no conflict.

Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific details disclosed below. Example limitations.

A large-size holographic display device provided by an embodiment of the present application, as shown in FIG. 1 , includes a light source unit, a filter unit, a beam expansion unit, a collimation unit, and a display panel, wherein the filter unit is used to emit light from the light source unit. The beam formed by the beam forms a uniformly divergent first spherical wave; the beam expansion unit is used to expand the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than the irradiation area of the first spherical wave; the collimation unit , used for collimating the second spherical wave into a parallel light beam; the display panel shown is used for receiving the parallel light beam and displaying a holographic image according to the parallel light beam.

Optionally, the light source unit includes a laser light source.

The laser light emitted by the laser light source is uniformly dispersed into a first spherical wave after passing through the filter unit, and the first spherical wave is expanded into a second spherical wave after passing through the beam expansion unit, wherein the irradiation area of the second spherical wave is larger than that of the first spherical wave . It can be understood that the irradiated area is similar to the area of the final display panel, so that the irradiated area of the light beam can be enlarged and the large-sized display panel can be better fully irradiated.

The second spherical wave is collimated into a parallel light beam after passing through the collimating unit, so as to better illuminate the display panel to form a holographic image. The display panel needs to load a pre-made hologram, and perform wavefront reproduction according to the above-mentioned parallel light beam, and finally form a reproduced hologram image.

The large-size holographic display device in the embodiment of the present application uses a collimating unit to generate a large-diameter parallel light beam, which not only realizes the reproduction light irradiation to the large-size display panel, but also reduces the volume and weight of the reproduction system, which is convenient for subsequent large-scale holographic display. Integration and commercialization of dimensional holographic display systems.

The above-mentioned filtering unit, beam expanding unit and collimating unit can be respectively a spatial filter array, a beam expander and a collimating lens array, as shown in FIG. The devices among the spatial filter array, the beam expander array and the collimating lens array are in one-to-one correspondence with each other.

The collimating lens in this embodiment uses a relatively thin and light Fresnel lens (as shown in Figure 3 and Figure 4 ), of course, it can also be other lenses or optical elements with collimation function and smaller volume, as long as the The requirements of the present application are all within the protection scope of this embodiment, and those skilled in the art can freely choose according to the actual situation, which is not specifically limited in the present application.

In the embodiment of the present application, the light source unit includes a light source and a light source beam splitter, and the light source beam splitter is arranged in the outgoing light direction of the light source. Beams with the same number of devices in the array.

The scattered beams irradiate each spatial filter in the spatial filter array respectively, the beams after passing through each spatial filter irradiate each beam expander in the beam expander array, and then the outgoing beams are respectively collimated Each collimating lens in the lens array is finally illuminated into the display panel.

It can be understood that the "array" in this embodiment of the present application indicates that the number of devices is at least two.

In the embodiment of the present 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 a plurality of collimating lenses arranged in a matrix, as shown in FIG. 4 . A schematic diagram of a collimating lens array is shown. Preferably, the plurality of collimating lenses are closely arranged, so that the emitted light beams are closely spliced, and at the same time, the size of the holographic display device can be effectively reduced. In the same way, the arrangement of the spatial filter array and the beam expander array needs to be in a one-to-one correspondence with the devices of the collimating lens, that is, the spatial filter array, the beam expander array and the collimating lens array are all arranged in sequence, or they are all in a matrix. style settings.

The present application also discloses a structural diagram of a holographic display device according to 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, and for each beam splitter in the beam splitter array, For dividing the light beam irradiated thereon into a reflected light beam and a transmitted light beam, wherein the reflected light beam illuminates the display panel. Those skilled in the art can set the display panel at a reasonable position according to the above description.

The light source unit includes a laser light source, the light beam emitted from the laser light source is uniformly dispersed into a first spherical wave after passing through a single spatial filter, the first spherical wave is expanded into a second spherical wave after passing through the beam expansion unit, and then the second spherical wave A single collimating lens in the collimation is collimated into a parallel beam, and after the parallel beam passes through the beam splitter array, the reflected beam is a large-area parallel beam irradiated on the display panel.

In this embodiment, only an array of beam splitters is used, which greatly reduces the system and complexity of the display device.

In addition, in this embodiment, the orthographic projection of the beam splitter array along the reflected beam direction is seamless, and the beam splitters in the beam splitter array do not overlap along the reflected beam direction. That is to say, the reflected beam after passing through the beam splitter array is a parallel beam with uniform light intensity. As shown in Figure 6, the angles of multiple beam splitters in the beam splitter array can be set and adjusted to ensure that the beam splitter passes through the beam splitter. The reflected beam of the mirror array is a parallel beam, and preferably, a plurality of beam splitters in the beam splitter array are arranged in parallel.

Further, along the direction of the beam exiting from a single collimating lens, the ratio of reflectivity and transmittance of the multiple beam splitters in the beam splitter array is sequentially increased, so that the light intensity difference of the reflected beams of the multiple beam splitters is increased. within the preset range. The preset range can be set by those skilled in the art based on experience, and it is only necessary to ensure that the light intensity of the reflected beams of each beam splitter is approximately equal.

透射率为

其中N为分束镜阵列中分束镜的数量，所述i为沿光束照射方向的分束镜的序号，i为正整数。Preferably, the light intensity of the reflected beam of each beam splitter is equal, and this embodiment provides a method, that is, the reflectivity of each beam splitter is equal to

transmittance

Wherein N is the number of beam splitters in the beam splitter array, the i is the serial number of the beam splitters along the beam irradiation direction, and i is a positive integer.

As shown in Figure 6, the beam splitters are arranged in sequence along the direction of the beam exiting from a single collimating lens (that is, the initial incident light in the drawing). For example, the number of beam splitters is 10 and the initial incident light intensity is 100. The mirrors are numbered 1, 2, 3...10 in order. The reflectivity of the first beam splitter is one-tenth and the transmittance is nine-tenths. Correspondingly, the reflected light intensity is 10 and the transmitted light intensity is 90; the reflectivity of the second beam splitter is nine 1/9, the transmittance is 8/9, correspondingly, the reflected light intensity is 10, and the transmitted light intensity is 80; the reflectivity of the third beam splitter is 1/8, and the transmittance is 7/8, Correspondingly, the reflected light intensity is 10, the transmitted light intensity is 70... and so on, and finally the reflected light intensity of each beam splitter is 10.

In this way, the light intensity of the parallel light beams irradiated to the display panel is made 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 transmittance is 0, that is, the beam splitter is a reflection 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 semi-reflective and semi-transparent film lens, a plate beam splitter, and a square beam splitter, and may also have a flat appearance Any optical element that can flexibly adjust the energy ratio of the beam, such as diffraction gratings, metamaterial microstructures, two-dimensional material structures, micro-nano optical elements, diffractive optical elements, etc.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. a large-size holographic display device, characterized in that, the device comprises a light source unit, a filter unit, a beam expansion unit, a collimation unit and a display panel, wherein, The filtering unit is used for forming a uniformly divergent first spherical wave from the light beam emitted from the light source unit; The beam expanding unit is configured to expand the first spherical wave into a second spherical wave, wherein the irradiation area of the second spherical wave is larger than the irradiation area of the first spherical wave; the collimating unit for collimating the second spherical wave into a parallel beam; The shown display panel is used for receiving the parallel light beam and displaying a holographic image according to the parallel light beam. 2. The holographic display device according to claim 1, wherein 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, wherein , the devices among the spatial filter array, the beam expander array and the collimating lens array are in one-to-one correspondence with each other. 3 . The holographic display device according to claim 2 , wherein the light source unit comprises a light source and a light source beam splitter, wherein the light source beam splitter is used for dispersing the light beams emitted from the light source into the spatial filter array. 4 . beams with the same number of devices. 4. The holographic display device according to claim 1, wherein the filtering unit is a single spatial filter, the beam expanding unit is a single beam expander, and the collimating unit comprises a single collimating lens and a splitter. beam mirror array, For each beam splitter in the beam splitter array, the beam splitter is used for dividing the light beam irradiated thereon into a reflected light beam and a transmitted light beam, wherein the reflected light beam illuminates the display panel. 5 . The holographic display device according to claim 4 , wherein the orthographic projection of the beam splitter array along the reflected beam direction is seamless, and a plurality of beam splitters in the beam splitter array The reflected beam directions do not overlap. 6 . The holographic display device according to claim 4 , wherein the ratio of reflectivity and transmittance of the plurality of beam splitters in the beam splitter array along the direction of the beam exiting from the single collimating lens The steps are sequentially increased, so that the light intensity difference of the reflected beams of the multiple beam splitters is within a preset range. 7. The holographic display device according to claim 6, wherein the reflectivity of the beam splitter is

transmittance

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. 8 . The holographic display device according to claim 4 , wherein the last beam splitter along the beam irradiation direction in the beam splitter array is a reflecting mirror. 9 . 9 . The holographic display device according to claim 4 , wherein a plurality of beam splitters in the beam splitter array are arranged in parallel. 10 . 10. The holographic display device according to any one of claims 4-7, wherein the beam splitter in the beam splitter array comprises a transflective lens, a plate beam splitter, a square beam splitter Any one of a beamer, 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.

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