CN115981026A - Crosstalk-free grating stereoscopic display - Google Patents
Crosstalk-free grating stereoscopic display Download PDFInfo
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Abstract
The invention provides a crosstalk-free grating three-dimensional display, which aims to solve the problems that the viewpoint position of the traditional grating three-dimensional display is fixed and crosstalk is easily generated at the boundary position of adjacent viewpoint viewing areas. The crosstalk-free grating stereoscopic display projects the parallax image on the transparent liquid crystal display panel onto the scattering layer by using the controllable directional light source array, and projects the parallax image on the scattering layer onto the viewpoint position through the light splitting element. Because the light direction projected by the controllable directional light source array is adjustable, when the human eyes are identified to be at the junction position of the adjacent viewpoint watching areas, the controllable directional light source array changes the light projection direction, so that the parallax images are projected to different positions on the scattering layer, the viewpoint positions are adjusted in time, the human eyes are not at the junction position of the adjacent viewpoint watching areas any more, and finally, the grating three-dimensional display without crosstalk is realized.
Description
Technical Field
The invention belongs to the technical field of grating stereo display, and particularly relates to a crosstalk-free grating stereo display.
Background
The existing grating stereoscopic display can respectively project different parallax images to corresponding viewpoint positions by using a light splitting element, and human eyes can see the corresponding parallax images when being positioned at the different viewpoint positions, so that stereoscopic vision is generated. However, since the positions of the pixels and the light splitting elements are fixed, the viewing point position of the conventional grating stereoscopic display is fixed, and crosstalk is very easily generated at the boundary position of the viewing areas of adjacent viewing points. In order to solve the problem, the invention provides a crosstalk-free grating stereoscopic display. The crosstalk-free grating stereoscopic display provided 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 light direction projected by the controllable directional light source array is adjustable, when the human eyes are identified to be at the junction position of the adjacent viewpoint watching areas, the controllable directional light source array changes the light projection direction, so that the parallax images are projected to different positions on the scattering layer, the viewpoint positions are adjusted in time, the human eyes are not at the junction position of the adjacent viewpoint watching areas any more, and finally, the grating three-dimensional display without crosstalk is realized.
Disclosure of Invention
The invention provides a crosstalk-free grating stereoscopic display, which aims to solve the problems that the viewpoint position of the traditional grating stereoscopic display is fixed and crosstalk is easily generated at the boundary position of the adjacent viewpoint watching areas.
The crosstalk-free grating stereoscopic display comprises 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 controllable directional light source array is arranged at the end and is formed by two-dimensionally and tightly arranging a plurality of controllable directional light source modules, and the controllable directional light source array can generate two parallel light beams with different directions in the horizontal direction. Specifically, the controllable directional light source module is composed of 2 light sources, a light blocking wall and a convex lens. The light blocking wall enables light emitted by the light source to exit only 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 lens and are respectively projected to different horizontal directions; at the same time, only 1 of the 2 light sources is lighted, and the light projection directions of all the light source modules with controllable directivity are consistent.
The transparent liquid crystal display panel is disposed in front of the controllable directional light source array and is used for displaying the parallax synthesized image, and the transmission 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 disposed in front of the transparent liquid crystal display panel. The parallax synthetic image on the transparent liquid crystal display panel is projected onto the scattering layer by the parallel light beams emitted by the controllable directional light source array, and the light of the parallax synthetic image is scattered forwards by the scattering layer. The two parallel light beams with different directions generated by the controllable directional light source array can respectively project the parallax synthetic image on the transparent liquid crystal display panel to different positions in the horizontal direction of the scattering layer, and 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 light splitting element is arranged in front of the scattering layer and projects each parallax image in the parallax synthetic image on the scattering layer to different viewpoint positions respectively.
Optionally, the light splitting element is formed by a cylindrical lens grating, and a distance from the cylindrical lens grating to the scattering layer is equal to a focal length of the cylindrical 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 human eyes of a viewer are located at the junction position of the adjacent viewpoint viewing areas, the controllable directional light source array switches to emit parallel light beams in the other direction.
The principle of the invention for realizing the crosstalk-free three-dimensional display is as follows:
the parallax synthetic image on the transparent liquid crystal display panel is projected onto the scattering layer by the parallel light beams emitted by the controllable directional light source array, and the light of the parallax synthetic image is scattered forwards by the scattering layer. And the light splitting element projects each parallax image in the parallax synthetic image on the scattering layer to different viewpoint positions respectively. If the human eye is just at the boundary position of the adjacent viewpoint watching areas, the controllable directional light source array switches to emit parallel light beams in the other direction. Because the switched parallel light beams in the other direction can make the parallax synthetic image generate p/2 displacement in the horizontal direction of the scattering layer, wherein p is the pixel dot pitch of the transparent liquid crystal display panel, the viewpoint position formed by the parallax synthetic image projected by the light splitting element is changed immediately, and the boundary position of the adjacent viewpoint watching area where the human eyes are originally positioned is changed into the center position of the viewpoint watching area. While the center position of the viewpoint viewing zone generally does not produce 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 can be projected to different positions on the scattering layer, and the different parallel light beams can cause the parallax composite image to generate p/2 displacement in the horizontal direction of the scattering layer, so that when the human eye is just positioned at the boundary position of the adjacent viewpoint viewing area, the controllable directional light source array can switch to emit the parallel light beams in the other direction, so that the boundary position of the original adjacent viewpoint viewing area can be immediately changed to the center position of the viewpoint viewing area. Because the central position of the viewpoint watching area usually does not generate crosstalk, the invention can realize grating three-dimensional display without crosstalk.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic diagram of the first parallel beam optical path principle of the present invention.
Fig. 3 is a schematic diagram of the optical path of a second parallel beam according to the present invention.
An icon: 100-a controllable directional light source module; 110-a light-blocking wall; 120-convex lens; 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-second parallax image pixel columns; 300-a scattering layer; 400-a light splitting element; 510-a first viewpoint viewing zone; 520-second viewpoint viewing zone.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Detailed description of the preferred embodiments
Fig. 1 is a cross-talk-free grating stereoscopic display provided in this embodiment.
The crosstalk-free grating stereoscopic display comprises 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 array of directionally controllable light sources, the transparent liquid crystal display panel 200, the scattering layer 300, and the light splitting element 400 are sequentially disposed from back to front.
The steerable light source array is placed at the end and is formed by two-dimensionally closely arranging a plurality of steerable light source modules 100 in the x-y plane, which can generate two parallel beams of light in different directions in the horizontal x-direction. Specifically, the light source module 100 includes 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 from the first and second light sources 130 and 140 to exit only the convex lens 120. The first light source 130 and the second light source 140 are disposed on the focal plane of the convex lens 120 and are arranged at intervals in the horizontal x direction; the light 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 projected to different horizontal directions respectively; at the same time, only 1 of the first light source 130 and the second light source 140 is turned on, and the light projection directions of all the light source modules 100 are the same.
The transparent liquid crystal display panel 200 is disposed in front of the controllable directional light source array for displaying the parallax-synthesized image without changing the propagation direction when light passes through the transparent liquid crystal display panel 200. The parallax composite image is formed by two parallax images which are alternately arranged according to 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 scattering 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 synthetic image on the transparent liquid crystal display panel 200 onto the scattering layer 300, and the scattering layer 300 scatters the parallax synthetic image light forward. 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 to different positions in the horizontal x direction of the scattering layer 300, and generate a displacement of p/2=0.139 mm in the horizontal x direction of the scattering layer 300, where 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 in front of the scattering layer 300 and is formed by a lenticular lens grating, and a distance from the lenticular lens grating to the scattering layer 300 is equal to a focal length of the lenticular lens grating, so that each parallax image in the parallax composite image on the scattering layer 300 can be projected to different viewpoint positions respectively. Referring to fig. 2, the first parallax image pixel array 210 is projected to the first viewpoint viewing zone 510, and the second parallax image pixel array 220 is projected to the second viewpoint viewing zone 520.
The human eye detection device is used for detecting the eye position of a viewer. When the human eye detection device detects that human eyes of a viewer are located at the junction position of the adjacent viewpoint viewing areas, the controllable directional light source array switches to emit parallel light beams in the other direction.
The principle of the invention for realizing the crosstalk-free three-dimensional display is as follows:
referring to fig. 2, the parallel light beams emitted by the controllable directional light source array project the parallax synthetic image on the transparent liquid crystal display panel 200 onto the scattering layer 300, and the scattering layer 300 scatters the parallax synthetic image light forward. The light splitting 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 just at the boundary position between the first viewpoint viewing area 510 and the second viewpoint 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 emit parallel light beams in the other direction, and the switched light path refers to fig. 3. As shown in fig. 3, since the switched parallel light beams in the other direction can cause a displacement of p/2 in the horizontal x direction of the scattering layer 300, where p is the pixel pitch of the transparent liquid crystal display panel 200, the viewpoint position formed by the parallax image projected by the light splitting element 400 is changed, and the boundary position of the first viewpoint viewing area 510 and the second viewpoint viewing area 520 where the human eye is located in fig. 2 is changed to the center position of the first viewpoint viewing area 510 in fig. 3. While the central position of the first viewpoint viewing zone 510 generally does not generate crosstalk.
In summary, the direction of the parallel light beams emitted by the controllable directional light source array can be changed in the present invention, so that the parallax composite image on the transparent liquid crystal display panel 200 can be projected at different positions on the scattering layer 300, and the different parallel light beams can cause the parallax composite image to generate a p/2 displacement in the horizontal x direction of the scattering layer 300, so that when the human eye is just located at the boundary position of the adjacent viewing point viewing area, the controllable directional light source array can switch to emit the parallel light beams in the other direction, so that the boundary position of the original adjacent viewing point viewing area can be immediately changed to the center position of the viewing point viewing area. Because the central position of the viewing area of the viewpoint usually does not generate crosstalk, the invention can realize grating three-dimensional display without crosstalk.
Claims (3)
1. A crosstalk-free grating stereoscopic display is characterized in that:
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 controllable directional light source array is arranged at the end and is formed by two-dimensional close arrangement of a plurality of controllable directional light source modules, and the controllable directional light source array can generate two parallel light beams with different directions in the horizontal direction; specifically, the controllable directional light source module is composed of 2 light sources, a light blocking wall and a convex lens; the light blocking wall enables the 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 lens and are respectively projected to different horizontal directions; at the same time, only 1 of the 2 light sources is lighted, 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 used for displaying the parallax synthetic image, and the transmission direction is not changed when light passes through the transparent liquid crystal display panel; the parallax synthetic image is formed by alternately arranging a plurality of parallax images according to pixel columns;
the scattering layer is arranged in front of the transparent liquid crystal display panel; the parallax synthetic image on the transparent liquid crystal display panel is projected onto the scattering layer by the parallel light beams emitted by the controllable directional light source array, and the light rays of the parallax synthetic image are scattered forwards by the scattering layer; two parallel light beams in 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 in the horizontal direction of the scattering layer, and p/2 displacement is generated in the horizontal direction of the scattering layer, wherein p is the pixel dot pitch 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 synthetic image on the scattering layer to different viewpoint positions respectively;
the human eye detection device is used for detecting the eye position of a viewer; when the human eye detection device detects that human eyes of a viewer are located at the junction position of the adjacent viewpoint viewing areas, the controllable directional light source array switches to emit parallel light beams in the other direction.
2. A crosstalk-free grating stereoscopic display according to claim 1, wherein: the light 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. The crosstalk-free grating stereoscopic display of claim 1, wherein: the light splitting element is constituted by a slit grating.
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