CN209879155U - Stereoscopic projection device based on double gratings - Google Patents
Stereoscopic projection device based on double gratings Download PDFInfo
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- CN209879155U CN209879155U CN201920891759.1U CN201920891759U CN209879155U CN 209879155 U CN209879155 U CN 209879155U CN 201920891759 U CN201920891759 U CN 201920891759U CN 209879155 U CN209879155 U CN 209879155U
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- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims abstract description 93
- 230000009977 dual effect Effects 0.000 claims description 12
- 238000003384 imaging method Methods 0.000 claims description 7
- 230000000007 visual effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
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- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 206010020675 Hypermetropia Diseases 0.000 description 1
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Abstract
The utility model provides a stereoscopic projection device based on double grating. The cylindrical lens-based stereoscopic projection device is composed of a first cylindrical lens grating, a first polymer dispersed liquid crystal scattering layer, a second cylindrical lens grating and a plurality of projectors. The projector can project the corresponding parallax image and form an image near the second cylindrical lens grating. The second cylindrical lens grating, the first polymer dispersed liquid crystal scattering layer, the second polymer dispersed liquid crystal scattering layer and the first cylindrical lens grating can project the parallax image to a designated direction in space so as to converge into a viewpoint. When the human eyes are positioned at different visual point positions, the corresponding parallax images can be seen respectively, so that the stereoscopic vision is realized. The stereoscopic projection device is convenient to be used in outdoor and show window display environments due to the fact that the projector and the viewer are distributed on different sides of the first cylindrical lens grating and the second cylindrical lens grating.
Description
Technical Field
The utility model relates to a display technology, more specifically say, the utility model relates to a 3D stereoscopic display technique.
Background
The 3D display technology is a display technology that can realize real reproduction of a stereoscopic scene, and can provide different parallax images to human eyes, respectively, thereby enabling a person to generate stereoscopic vision. Typically, stereoscopic displays are composed of a raster and a stereoscopic parallax composite image. By the precise coupling, the stereoscopic parallax synthetic image pixels can be rasterized to a specified direction, thereby forming a viewpoint. That is, when the human eyes are at different viewpoints, the left and right eyes can respectively see different parallax images, thereby generating stereoscopic vision. In realizing a large-sized stereoscopic display, a stereoscopic projection apparatus using a projector as a medium for providing a stereoscopic parallax composite image may be used. The conventional stereoscopic projection apparatus usually adopts a front projector manner, that is, the viewer and the projector are located on the same side of the screen for projection. The utility model discloses a stereoscopic projection device viewer and projector based on double grating distribute and show in the different sides of screen, are convenient for be used for outdoor, show display environment such as window.
Disclosure of Invention
The utility model provides a stereoscopic projection device based on double grating. Fig. 1 is a schematic structural diagram of the stereoscopic projection device based on the double grating. The stereoscopic projection device based on the double gratings consists of a first cylindrical lens grating, a first polymer dispersed liquid crystal scattering layer, a second cylindrical lens grating and a plurality of projectors. The first cylindrical lens grating, the first polymer dispersed liquid crystal scattering layer, the second polymer dispersed liquid crystal scattering layer and the second cylindrical lens grating are sequentially arranged from front to back, and the projector is arranged on one side close to the second cylindrical lens grating. The projector can project the parallax image corresponding to the projector to the vicinity of the second lenticular lens. The second cylindrical lens grating can focus the imaging light beam projected by the projector and then project the imaging light beam at the positions of the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer. The first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer can be switched between a scattering state and a transparent state. At the same time, only one polymer dispersed liquid crystal scattering layer is in a scattering state. When the first polymer dispersed liquid crystal scattering layer is in a scattering state and the second polymer dispersed liquid crystal scattering layer is in a transparent state, the parallax synthetic image projected by the second cylindrical lens grating is imaged at the position of the first polymer dispersed liquid crystal scattering layer. On the contrary, when the first polymer dispersed liquid crystal scattering layer is in a transparent state and the second polymer dispersed liquid crystal scattering layer is in a scattering state, the parallax synthesized image projected by the second lenticular lens grating is imaged at the position of the second polymer dispersed liquid crystal scattering layer. The first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer can scatter light beams projected by the second cylindrical lens grating when in a scattering state. The first cylindrical lenticulation can project the light beam to the appointed direction in the space again, so as to converge the light beam into the viewpoint.
Because the projectors are respectively arranged at different horizontal spatial positions in the double-grating-based stereoscopic projection device, when the light rays of the projectors penetrate through the second cylindrical lens grating, the horizontal spatial positions of imaging light beams on the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer are different. Therefore, the first lenticular lens can project and converge parallax images from different projectors to different viewpoint positions. When the human eyes are positioned at different visual point positions, the corresponding parallax images can be seen respectively, so that the stereoscopic vision is realized.
In the stereo projection device based on the double grating, the optimal viewing distance which is the distance from the viewpoint to the first cylindrical lens grating is set asl 1The distance from the first cylindrical lens grating to the polymer dispersed liquid crystal scattering layer in a scattering state isl 2The distance between the polymer dispersed liquid crystal scattering layer in the scattering state and the second cylindrical lens grating isl 3The distance from the second cylindrical lens grating to the projector isl 4The first cylindrical lenticulation has a grating pitch ofp 1The first cylindrical lenticulation has a grating pitch ofp 2. Preferably, the above parameters should satisfy:。
because the positions of the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer are different, when the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer are respectively in a scattering state,l 2andl 3the value will change. According to the formulaThe utility model discloses a stereoscopic projection device based on two gratings can be in differenceThe viewpoint is formed at the optimal viewing distance.
Alternatively, the first lenticular lens grating and the second lenticular lens grating may be replaced by a slit grating.
Optionally, more polymer dispersed liquid crystal scattering layers may be disposed between the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer.
In the utility model, because the stereo projection device based on the double gratings does not relate to the coupling of the parallax image pixels and the grating structure, and the projection position of the viewpoint is determined only by the position of the projector, the position of the projector can be directly fixed during the preparation, and the parallax image only needs to be conveyed to the projector during the use; the stereoscopic projection device based on the double gratings uses the projector to perform projection display, so that large-size display is convenient to realize; in the double-grating-based stereoscopic projection device, the projector and the viewer are distributed on different sides of the first cylindrical lens grating, the first polymer dispersed liquid crystal scattering layer, the second polymer dispersed liquid crystal scattering layer and the second cylindrical lens grating, so that the device is convenient to be used in display environments such as outdoor and show windows; because first polymer dispersed liquid crystal scattering layer, second polymer dispersed liquid crystal scattering layer are in when the scattering state respectively, the utility model discloses a stereoscopic projection device based on two gratings can form the sight point on the best viewing distance of difference, the utility model discloses can carry out the regulation of best viewing distance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 shows the optical principle of the polymer dispersed liquid crystal scattering layer.
Fig. 3 is a schematic diagram of the optical path principle of one of the viewpoints of the present invention.
Fig. 4 is the schematic diagram of the utility model discloses realize that stereoscopic display realizes far-sighted distance.
Fig. 5 is a schematic diagram of the present invention for realizing three-dimensional display to realize near visual range.
Icon: 010-stereoscopic projection devices based on double gratings; 100-a first cylindrical lenticulation; 210-a first polymer dispersed liquid crystal scattering layer; 220-a second polymer dispersed liquid crystal scattering layer; 300-second cylindrical lens grating; 400-a projector; 020-scattering principle of polymer dispersed liquid crystal scattering layer; 030-light path for light from a projector; 040-distance vision shows the principle model; 050-short distance display principle model.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that the terms "first", "second", and the like are used for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Examples
Fig. 1 is a schematic structural diagram of a dual-grating-based stereoscopic projection apparatus 010 according to this embodiment, in which an x coordinate represents a horizontal direction in space, a y coordinate represents a vertical direction in space, and a z direction represents an axial direction perpendicular to an x-y plane. Referring to fig. 1, the present embodiment provides a stereoscopic projection apparatus 010 based on dual gratings, which includes a first lenticular lens 100, a first polymer dispersed liquid crystal scattering layer 210, a second polymer dispersed liquid crystal scattering layer 220, a second lenticular lens 300, and 4 projectors 400.
The stereoscopic projection device 010 based on the double grating provided in the embodiment will be further explained.
The first lenticular lens grating 100, the first polymer dispersed liquid crystal scattering layer 210, the second polymer dispersed liquid crystal scattering layer 220, and the second lenticular lens grating 300 are sequentially disposed in front of and behind one another, and the projector 400 is disposed on a side close to the second lenticular lens grating 300. The projector 400 may project a parallax image corresponding thereto to the vicinity of the second lenticular lens 300. The second cylinder lens grating 300 can focus the imaging light beam projected by the projector 400 and project the focused imaging light beam at the positions of the first polymer dispersed liquid crystal scattering layer 210 and the second polymer dispersed liquid crystal scattering layer 220.
The first polymer dispersed liquid crystal scattering layer 210 and the second polymer dispersed liquid crystal scattering layer 220 are switchable between scattering and transparent states. Referring to fig. 2, the first polymer dispersed liquid crystal scattering layer 210 is the same as the second polymer dispersed liquid crystal scattering layer 220, and electrodes are disposed on the upper and lower polymer layers, and liquid crystal particles are uniformly distributed between the electrodes, so that the two states can be switched between a scattering state and a transparent state. When no voltage is applied to the electrodes of the polymer dispersed liquid crystal scattering layer 210, a regular electric field cannot be formed between the electrodes, the optical axes of the liquid crystal particles are randomly oriented, a disordered state is present, the effective refractive index thereof does not match the refractive index of the polymer, and the incident light is strongly scattered. When a voltage is applied between the electrodes, the refractive index of the liquid crystal microparticles and the refractive index of the polymer are substantially matched, and the polymer dispersed liquid crystal scattering layer 210 is transparent, and incident light is not scattered.
At the same time, only one polymer dispersed liquid crystal scattering layer is in a scattering state. When the first polymer dispersed liquid crystal scattering layer 210 is in a scattering state and the second polymer dispersed liquid crystal scattering layer 220 is in a transparent state, the parallax composite image projected by the second lenticular lens 300 is imaged at the position of the first polymer dispersed liquid crystal scattering layer 210. On the contrary, when the first polymer dispersed liquid crystal scattering layer 210 is in a transparent state and the second polymer dispersed liquid crystal scattering layer 220 is in a scattering state, the parallax composite image projected by the second lenticular lens 300 is imaged at the position of the second polymer dispersed liquid crystal scattering layer 220.
The first or second polymer dispersed liquid crystal scattering layer may scatter the light beam projected from the second lenticular lens 300. The first lenticular lens 100 may project the light beam to a designated direction in space again, thereby converging the light beam into a viewpoint. Referring to FIG. 3, the x-coordinate represents the horizontal direction in space, the y-coordinate represents the vertical direction in space, and the z-direction represents the axial direction perpendicular to the x-y plane. Taking the viewpoint 2 as an example, the projector 400 may project the parallax image to the vicinity of the second lenticular lens 300. After the light from the projector 400 is focused by the different cylindrical lenses on the second cylindrical lens grating 300, since the second polymer dispersed liquid crystal scattering layer 220 is in the scattering state, the first polymer dispersed liquid crystal scattering layer 210 is in the transparent state, which can form scattering on the second polymer dispersed liquid crystal scattering layer 220, the second polymer dispersed liquid crystal scattering layer 220 scatters the light beam forward, the light beam can be projected through the corresponding cylindrical lens on the first cylindrical lens grating 100, and finally the light beams projected by the respective cylindrical lenses are converged to form the viewpoint 2.
Fig. 4 is a schematic diagram of the stereoscopic display implemented by the embodiment, in which an x coordinate represents a horizontal direction in space, a y coordinate represents a vertical direction in space, and a z direction represents an axial direction perpendicular to an x-y plane. Referring to fig. 3 and 4, since the 4 projectors 400 are located at different horizontal spatial positions in the dual-grating-based stereoscopic projection apparatus, when the light passes through the second lenticular lens 300, the horizontal spatial positions of the imaging light beams on the second polymer dispersed liquid crystal scattering layer 220 are different. Therefore, the first lenticular lens 100 can project and converge the parallax images from 4 different projectors 400 to 4 different viewpoint positions, thereby forming a 4-viewpoint stereoscopic image display. When the human eyes are positioned at different visual point positions, the corresponding parallax images can be seen respectively, so that the stereoscopic vision is realized.
In the dual-grating-based stereoscopic projection apparatus, the optimal viewing distance, which is the distance from the viewpoint to the first lenticular lens grating 100, isl 1The distance from the first cylinder lenticulation 100 to the first polymer dispersed liquid crystal scattering layer 210 is 15 mm, the distance from the first cylinder lenticulation 100 to the second polymer dispersed liquid crystal scattering layer 210 is 20 mm, the distance from the first polymer dispersed liquid crystal scattering layer 210 to the second cylinder lenticulation 300 is 20 mm, the distance from the second polymer dispersed liquid crystal scattering layer 220 to the second cylinder lenticulation 300 is 15 mm, the distance from the second cylinder lenticulation 300 to the projector 400 is 1000 mm, and the first cylinder lenticulation pitch is 15 mmp 1Is 5 mm, the first cylindrical lens grating pitchp 2Is 5 mm.
When the second PDLC scattering layer 220 is in scattering state, the device is in far-viewing-distance mode, please refer to FIG. 4, according to the formulaThe optimal viewing distance of the dual grating based stereoscopic projection apparatus is 1333 mm.
When the first PDLC scattering layer 210 is in scattering state, the device is in near range mode, please refer to FIG. 5, according to the formulaThe optimal viewing distance of the dual grating-based stereoscopic projection apparatus is 750 mm.
In this embodiment, since the stereo projection apparatus 010 based on the dual grating does not involve the coupling between the parallax image pixels and the grating structure, and the projection position of the viewpoint is determined only by the position of the projector 400, the position of the projector 400 can be directly fixed during the preparation, and the parallax image only needs to be transmitted to the projector 400 during the use; the projector 400 is used for projection display in the double-grating-based stereoscopic projection device 010, so that large-size display is facilitated; in the dual-grating-based stereoscopic projection device 010, the projectors 400 and the viewers are distributed on different sides of the first lenticular lens 100, the first and second polymer dispersed liquid crystal scattering layers, and the second lenticular lens 300, so that the dual-grating-based stereoscopic projection device is convenient to be used in display environments such as outdoors and showcases; because first polymer dispersed liquid crystal scattering layer 210, second polymer dispersed liquid crystal scattering layer 220 are in when the scattering state respectively, the utility model discloses a stereoscopic projection device 010 can form the viewpoint on the best viewing distance of difference based on double grating, the utility model discloses can carry out the regulation of best viewing distance.
Claims (9)
1. A stereoscopic projection device based on double gratings is characterized in that: the stereoscopic projection device based on the double gratings is composed of a first cylindrical lens grating, a first polymer dispersed liquid crystal scattering layer, a second cylindrical lens grating and a plurality of projectors, wherein the first cylindrical lens grating, the first polymer dispersed liquid crystal scattering layer, the second polymer dispersed liquid crystal scattering layer and the second cylindrical lens grating are sequentially arranged from front to back, and the projectors are arranged on one side close to the second cylindrical lens grating.
2. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: the projector can project a parallax image to the vicinity of the second lenticular lens grating, and the second lenticular lens grating can project the focused imaging light beam projected by the projector to the positions of the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer.
3. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer can be switched between a scattering state and a transparent state, and only one polymer dispersed liquid crystal scattering layer is in the scattering state at the same time.
4. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: when the first polymer dispersed liquid crystal scattering layer is in a scattering state and the second polymer dispersed liquid crystal scattering layer is in a transparent state, the parallax synthetic image projected by the second lenticular lens grating is imaged at the position of the first polymer dispersed liquid crystal scattering layer, and conversely, when the first polymer dispersed liquid crystal scattering layer is in a transparent state and the second polymer dispersed liquid crystal scattering layer is in a scattering state, the parallax synthetic image projected by the second lenticular lens grating is imaged at the position of the second polymer dispersed liquid crystal scattering layer.
5. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer can scatter the light beams projected by the second cylindrical lens grating when in a scattering state, and the first cylindrical lens grating can project the light beams to a designated direction in space again so as to converge into a viewpoint.
6. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: in the stereo projection device based on the double grating, the optimal viewing distance which is the distance from the viewpoint to the first cylindrical lens grating is set asl 1The distance from the first cylindrical lens grating to the polymer dispersed liquid crystal scattering layer in a scattering state isl 2The distance between the polymer dispersed liquid crystal scattering layer in the scattering state and the second cylindrical lens grating isl 3The distance from the second cylindrical lens grating to the projector isl 4The first cylindrical lenticulation has a grating pitch ofp 1The first cylindrical lenticulation has a grating pitch ofp 2The above parameters should satisfy:。
7. the dual grating-based stereoscopic projection apparatus of claim 1, wherein: the first cylindrical lenticulation may be replaced by a slit grating.
8. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: the second cylindrical lens grating may be replaced by a slit grating.
9. The dual grating-based stereoscopic projection apparatus of claim 1, wherein: more polymer dispersed liquid crystal scattering layers may be disposed between the first polymer dispersed liquid crystal scattering layer and the second polymer dispersed liquid crystal scattering layer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286493A (en) * | 2019-06-14 | 2019-09-27 | 成都工业学院 | A kind of stereo projection apparatus based on double grating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286493A (en) * | 2019-06-14 | 2019-09-27 | 成都工业学院 | A kind of stereo projection apparatus based on double grating |
| CN110286493B (en) * | 2019-06-14 | 2024-02-13 | 成都工业学院 | Stereoscopic projection device based on double gratings |
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