CN115981026B - Crosstalk-free grating stereoscopic display - Google Patents
Crosstalk-free grating stereoscopic display Download PDFInfo
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Abstract
In order to solve the problem that crosstalk is easily generated at the boundary position of the adjacent view areas of the traditional grating stereoscopic display because the view point positions of the traditional grating stereoscopic display are fixed, the invention provides the crosstalk-free grating stereoscopic display. The crosstalk-free grating stereoscopic display utilizes a controllable directional light source array to project a parallax image on a transparent liquid crystal display panel onto a scattering layer, and then projects the parallax image on the scattering layer onto a viewpoint position through a light splitting element. Because the direction of the light projected by the controllable directional light source array is adjustable, when the human eyes are identified to be positioned at the boundary position of the adjacent view-point viewing area, the controllable directional light source array changes the light projection direction, so that parallax images are projected to different positions on the scattering layer, the view-point position is further adjusted timely, the human eyes are not positioned at the boundary position of the adjacent view-point viewing area, and finally, the cross-talk-free grating three-dimensional display is realized.
Description
Technical Field
The invention belongs to the technical field of grating stereoscopic display, and particularly relates to a crosstalk-free grating stereoscopic display.
Background
The existing grating stereoscopic display can respectively project different parallax images to corresponding viewpoint positions by utilizing a light splitting element, and when human eyes are positioned at the different viewpoint positions, the parallax images corresponding to the human eyes can be seen, so that stereoscopic vision is generated. However, because the positions of the pixels and the light-splitting elements are fixed, the positions of the view points of the conventional grating stereoscopic display are fixed, and crosstalk is very easy to generate at the boundary position of the viewing areas of adjacent view points. In order to solve the problem, the invention provides a cross-talk-free grating stereoscopic display. The crosstalk-free grating stereoscopic display disclosed by the invention utilizes the controllable directional light source array to project the parallax image on the transparent liquid crystal display panel onto the scattering layer, and then projects the parallax image on the scattering layer onto the viewpoint position through the light splitting element. Because the direction of the light projected by the controllable directional light source array is adjustable, when the human eyes are identified to be positioned at the boundary position of the adjacent view-point viewing area, the controllable directional light source array changes the light projection direction, so that parallax images are projected to different positions on the scattering layer, the view-point position is further adjusted timely, the human eyes are not positioned at the boundary position of the adjacent view-point viewing area, and finally, the cross-talk-free grating three-dimensional display is realized.
Disclosure of Invention
In order to solve the problem that crosstalk is easily generated at the boundary position of the adjacent view areas of the traditional grating stereoscopic display because the view point positions of the traditional grating stereoscopic display are fixed, the invention provides the crosstalk-free grating stereoscopic display.
The crosstalk-free grating stereoscopic display consists of a controllable directional light source array, a transparent liquid crystal display panel, a scattering layer, a light splitting element and a human eye detection device. The controllable directional light source array, the transparent liquid crystal display panel, the scattering layer and the light splitting element are sequentially arranged from back to front.
The light source array with controllable directivity is arranged at the end and consists of a plurality of light source modules with controllable directivity which are two-dimensionally and closely arranged, and can generate two parallel light beams with different directions in the horizontal direction. Specifically, the light source module with controllable directivity is composed of 2 light sources, a light blocking wall and a convex lens. The light blocking wall enables light rays emitted by the light source to only exit from the convex lens. The 2 light sources are arranged on the focal plane of the convex lens and are arranged at intervals in the horizontal direction; the light rays emitted by the 2 light sources can form parallel light beams by the convex lenses and respectively project to different horizontal directions; only 1 of the 2 light sources are lighted at the same time, and the light projection directions of all the light source modules with controllable directivity are consistent.
The transparent liquid crystal display panel is arranged in front of the controllable directional light source array and is used for displaying the parallax composite image, and the propagation direction of light rays is not changed when the light rays pass through the transparent liquid crystal display panel. The parallax composite image is formed by alternately arranging a plurality of parallax images in pixel columns.
The scattering layer is disposed in front of the transparent liquid crystal display panel. The parallel light beams emitted by the controllable directional light source array project the parallax synthetic image on the transparent liquid crystal display panel on the scattering layer, and the scattering layer scatters the parallax synthetic image light forwards. The parallel light beams with different directions generated by the controllable directional light source array can respectively project parallax synthetic images on the transparent liquid crystal display panel to different positions on the horizontal direction of the scattering layer, and p/2 displacement is generated on the horizontal direction of the scattering layer, wherein p is the pixel point distance of the transparent liquid crystal display panel.
The light splitting element is arranged in front of the scattering layer and projects each parallax image in the parallax composite image on the scattering layer to different viewpoint positions respectively.
Optionally, the beam-splitting element is formed by a lenticular lens grating, and the distance from the lenticular lens grating to the scattering layer is equal to the focal length of the lenticular lens grating.
Optionally, the light splitting element is formed by a slit grating.
The human eye detection device is used for detecting the eye position of a viewer. When the human eye detection device detects that the human eyes of the viewer are positioned at the boundary position of the viewing areas of the adjacent viewpoints, the controllable directional light source array is switched to emit parallel light beams in the other direction.
The invention realizes the principle of crosstalk-free three-dimensional display as follows:
the parallel light beams emitted by the controllable directional light source array project the parallax synthetic image on the transparent liquid crystal display panel on the scattering layer, and the scattering layer scatters the parallax synthetic image light forwards. The light-splitting element projects each parallax image in the parallax composite image on the scattering layer to a different viewpoint position, respectively. If the human eyes are just positioned at the junction position of the adjacent view areas, the controllable directional light source array is switched to emit parallel light beams in the other direction. The parallel light beams in the other direction after the switching can cause the parallax composite image to generate p/2 displacement in the horizontal direction of the scattering layer, wherein p is the pixel point distance of the transparent liquid crystal display panel, the viewpoint position formed by the parallax image projected by the light splitting element is changed immediately, and the boundary position of the adjacent viewpoint viewing area where the human eyes are originally positioned is changed into the center position of the viewpoint viewing area. While the viewpoint viewing area center position generally does not produce crosstalk.
In summary, the direction of the parallel light beam emitted by the controllable directional light source array can be changed, so that the parallax synthetic image on the transparent liquid crystal display panel can be projected to different positions on the scattering layer, and the different parallel light beams can enable the parallax synthetic image to generate p/2 displacement in the horizontal direction of the scattering layer, so that when a human eye is just positioned at the junction position of the adjacent view point viewing area, the controllable directional light source array can be switched to emit the parallel light beam in the other direction, and the junction position of the original adjacent view point viewing area can be changed to the center position of the view point viewing area immediately. Because the central position of the view point viewing area generally does not generate crosstalk, the invention can realize the crosstalk-free grating stereoscopic display.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic diagram of the optical path principle of the first parallel beam of the present invention.
Fig. 3 is a schematic diagram of the optical path principle of the second parallel beam of the present invention.
Icon: 100-a controllable directional light source module; 110-a light barrier; 120-convex lenses; 130-a first light source; 140-a second light source; 200-a transparent liquid crystal display panel; 210-a first parallax image pixel column; 220-a second parallax image pixel column; 300-scattering layer; 400-a light splitting element; 510—a first viewpoint viewing area; 520-second viewpoint viewing area.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Description of the embodiments
Fig. 1 is a schematic diagram of a cross-talk free grating stereoscopic display according to the present embodiment.
The crosstalk-free grating stereoscopic display is composed of a controllable directional light source array, a transparent liquid crystal display panel 200, a scattering layer 300, a light splitting element 400 and a human eye detection device. The controllable directional light source array, the transparent liquid crystal display panel 200, the scattering layer 300 and the light splitting element 400 are sequentially arranged from the back to the front.
The array of controllable-directivity light sources is disposed at the end, and is composed of a plurality of controllable-directivity light source modules 100 which are two-dimensionally and closely arranged in an x-y plane and can generate two parallel light beams with different directions in the horizontal x direction. Specifically, the controllable directional light source module 100 is composed of a first light source 130, a second light source 140, a light blocking wall 110 and a convex lens 120. The light blocking wall 110 allows the light emitted by the first light source 130 and the second light source 140 to exit only from the convex lens 120. The first light source 130 and the second light source 140 are arranged on the focal plane of the convex lens 120 and are arranged at intervals in the horizontal x direction; the light rays emitted by the first light source 130 and the second light source 140 can be formed into parallel light beams by the convex lens 120 and respectively projected to different horizontal directions; at the same time, only 1 of the first light source 130 and the second light source 140 are lighted, and the light projection directions of all the light source modules 100 with controllable directivity are consistent.
The transparent liquid crystal display panel 200 is disposed in front of the array of controllably directional light sources for displaying the parallax composite image without changing the propagation direction of light as it passes through the transparent liquid crystal display panel 200. The parallax composite image is formed by alternately arranging two parallax images in pixel columns. As shown in fig. 1, the first parallax image pixel columns 210 and the second parallax image pixel columns 220 are alternately arranged in the horizontal x direction.
The diffusion layer 300 is disposed in front of the transparent liquid crystal display panel 200. The parallel light beams emitted from the controllable directional light source array project the parallax composite image on the transparent liquid crystal display panel 200 onto the scattering layer 300, and the scattering layer 300 forward scatters the parallax composite image light. The two parallel light beams with different directions generated by the controllable directional light source array can respectively project the parallax composite image on the transparent liquid crystal display panel 200 at different positions along the horizontal x direction of the scattering layer 300, and generate displacement p/2=0.139 mm along the horizontal x direction of the scattering layer 300, wherein p is the pixel pitch of the transparent liquid crystal display panel 200, and is 0.278 mm.
The light splitting element 400 is disposed before the scattering layer 300, and is formed by a lenticular lens grating, the distance from the lenticular lens grating to the scattering layer 300 is equal to the focal length of the lenticular lens grating, and each parallax image in the parallax composite image on the scattering layer 300 can be respectively projected to different viewpoint positions. Referring to fig. 2, a first parallax image pixel column 210 is projected to a first viewing area 510, and a second parallax image pixel column 220 is projected to a second viewing area 520.
The human eye detection device is used for detecting the eye position of a viewer. When the human eye detection device detects that the human eyes of the viewer are positioned at the boundary position of the viewing areas of the adjacent viewpoints, the controllable directional light source array is switched to emit parallel light beams in the other direction.
The invention realizes the principle of crosstalk-free three-dimensional display as follows:
referring to fig. 2, parallel light beams emitted from the controllable directional light source array project a parallax composite image on the transparent liquid crystal display panel 200 onto the scattering layer 300, and the scattering layer 300 forward scatters the parallax composite image light. The spectroscopic element 400 projects each parallax image in the parallax composite image on the scattering layer 300 to a different viewpoint position, respectively. Referring to fig. 2, if the human eye is located at the boundary between the first viewing area 510 and the second viewing area 520, the controllable directional light source array turns off the first light source 130 and turns on the second light source 140 to switch and emit parallel light beams in another direction, and the switched light paths refer to fig. 3. As shown in fig. 3, the parallax composite image is shifted by p/2 in the horizontal x direction of the scattering layer 300 due to the parallel light beams in the other direction after the switching, where p is the pixel pitch of the transparent lcd panel 200, the view point position formed by the parallax image projected by the light splitting element 400 is changed, and the boundary position of the first view point viewing area 510 and the second view point viewing area 520 where the human eyes are located in fig. 2 is changed to the center position of the first view point viewing area 510 in fig. 3. While the first viewpoint viewing area 510 is generally centered without crosstalk.
In summary, the direction of the parallel light beams emitted by the controllable directional light source array can be changed, so that the parallax composite image on the transparent liquid crystal display panel 200 can be projected on different positions on the scattering layer 300, and the different parallel light beams can enable the parallax composite image to generate p/2 displacement in the horizontal x direction of the scattering layer 300, so that when the human eye is exactly located at the boundary position of the adjacent view-point viewing area, the boundary position of the original adjacent view-point viewing area can be changed to the center position of the view-point viewing area immediately by switching and emitting the parallel light beams in the other direction by the controllable directional light source array. Because the central position of the view point viewing area generally does not generate crosstalk, the invention can realize the crosstalk-free grating stereoscopic display.
Claims (3)
1. A cross-talk free grating stereoscopic display, characterized by:
the crosstalk-free grating stereoscopic display consists of a controllable directional light source array, a transparent liquid crystal display panel, a scattering layer, a light splitting element and a human eye detection device; the controllable directional light source array, the transparent liquid crystal display panel, the scattering layer and the light splitting element are sequentially arranged from back to front;
the light source array with controllable directivity is arranged at the last and is formed by two-dimensionally and tightly arranging a plurality of light source modules with controllable directivity, and the light source array can generate two parallel light beams with different directions in the horizontal direction; specifically, the light source module with controllable directivity is composed of 2 light sources, a light blocking wall and a convex lens; the light blocking wall enables light rays emitted by the light source to only exit from the convex lens; the 2 light sources are arranged on the focal plane of the convex lens and are arranged at intervals in the horizontal direction; the light rays emitted by the 2 light sources can form parallel light beams by the convex lenses and respectively project to different horizontal directions; at the same time, only 1 of the 2 light sources are lightened, and the light projection directions of all the light source modules with controllable directivity are consistent;
the transparent liquid crystal display panel is arranged in front of the controllable directional light source array and is used for displaying the parallax synthetic image, and the propagation direction is not changed when light passes through the transparent liquid crystal display panel; the parallax composite image is formed by alternately arranging a plurality of parallax images in pixel columns;
the scattering layer is arranged in front of the transparent liquid crystal display panel; the parallel light beams emitted by the controllable directional light source array project the parallax synthetic image on the transparent liquid crystal display panel on the scattering layer, and the scattering layer scatters the parallax synthetic image light forwards; the parallel light beams with different directions generated by the controllable directional light source array can respectively project parallax synthetic images on the transparent liquid crystal display panel to different positions on the horizontal direction of the scattering layer, and p/2 displacement is generated on the horizontal direction of the scattering layer, wherein p is the pixel point distance of the transparent liquid crystal display panel;
the light splitting element is arranged in front of the scattering layer and respectively projects each parallax image in the parallax synthetic image on the scattering layer to different viewpoint positions;
the human eye detection device is used for detecting the eye position of a viewer; when the human eye detection device detects that the human eyes of the viewer are positioned at the boundary position of the viewing areas of the adjacent viewpoints, the controllable directional light source array is switched to emit parallel light beams in the other direction.
2. A cross-talk free lenticular stereoscopic display as claimed in claim 1, wherein: the beam splitting element is composed of a cylindrical lens grating, and the distance from the cylindrical lens grating to the scattering layer is equal to the focal length of the cylindrical lens grating.
3. A cross-talk free lenticular stereoscopic display as claimed in claim 1, wherein: the spectroscopic element is constituted by a slit grating.
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| CN117939106B (en) * | 2024-03-19 | 2024-05-24 | 成都工业学院 | Viewpoint planning assembly for stereoscopic display |
| CN118348691B (en) * | 2024-06-17 | 2024-08-06 | 成都工业学院 | Folded surface three-dimensional display device |
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