CN116500803B - Time division multiplexing stereoscopic display device - Google Patents
Time division multiplexing stereoscopic display device Download PDFInfo
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- CN116500803B CN116500803B CN202310776974.8A CN202310776974A CN116500803B CN 116500803 B CN116500803 B CN 116500803B CN 202310776974 A CN202310776974 A CN 202310776974A CN 116500803 B CN116500803 B CN 116500803B
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- light sources
- retroreflective sheet
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- array
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 38
- 238000010586 diagram Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/26—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type
- G02B30/27—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays
- G02B30/28—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the autostereoscopic type involving lenticular arrays involving active lenticular arrays
Abstract
In order to solve the problem that the traditional stereoscopic display device has the optimal viewing distance, when viewers cannot see the identical parallax images at different viewing distances, the invention provides a time division multiplexing stereoscopic display device. The time division multiplexing stereoscopic display device is composed of a transparent liquid crystal display panel, a one-dimensional retroreflective sheet array and a light source array. The light source array is provided with a plurality of groups of light sources, and light rays emitted by any group of light sources can be reflected and converged to a viewing area corresponding to the light sources through the one-dimensional retroreflective sheet array. The transparent liquid crystal display panel provides parallax images of viewing areas corresponding to different light sources in a time division multiplexing manner, thereby forming a stereoscopic display. According to the invention, the viewing areas corresponding to the light sources of each group cover different front and rear space positions by arranging the directions of the one-dimensional retroreflective sheets. Therefore, the invention can enable viewers to see identical parallax images at different viewing distances.
Description
Technical Field
The invention belongs to the technical field of stereoscopic display, and particularly relates to a time division multiplexing stereoscopic display device.
Background
In general, a stereoscopic display device is composed of a 2D display panel and a spectroscopic element, which can project parallax images on the 2D display panel to different viewpoint positions in a space, and viewers located at the different viewpoint positions can see the parallax images corresponding thereto, thereby generating stereoscopic vision. However, the conventional stereoscopic display device has an optimal viewing distance, and when a viewer moves away from or approaches a screen, the viewer's eyes simultaneously see a plurality of parallax images, thereby forming crosstalk.
In order to solve the above problems, the present invention proposes a stereoscopic display device of time division multiplexing. The time division multiplexing stereoscopic display device is composed of a transparent liquid crystal display panel, a one-dimensional retroreflective sheet array and a light source array. The one-dimensional retroreflection sheet array and the light source array are used for projecting light rays; the transparent liquid crystal display panel is used for providing parallax images. The light source array is provided with a plurality of groups of light sources, and light rays emitted by any group of light sources can be reflected and converged to a viewing area corresponding to the light sources through the one-dimensional retroreflective sheet array. When a certain group of light sources are lighted in a time division multiplexing mode, the transparent liquid crystal display panel provides parallax images corresponding to the watching area, so that the invention can respectively provide parallax images in the areas corresponding to the groups of light sources in the light source array and form three-dimensional display. The directions of the one-dimensional retro-reflection sheets in the one-dimensional retro-reflection sheet array are the same, and the directions of the one-dimensional retro-reflection sheets determine the spatial directions of the light sources corresponding to the viewing areas. According to the invention, the viewing areas corresponding to the light sources of each group cover different front and rear space positions by arranging the directions of the one-dimensional retroreflective sheets. Therefore, the invention can enable viewers to see identical parallax images at different viewing distances.
Disclosure of Invention
In order to solve the problem that the traditional stereoscopic display device has the optimal viewing distance, when viewers cannot see the identical parallax images at different viewing distances, the invention provides a time division multiplexing stereoscopic display device.
The time division multiplexing stereoscopic display device is composed of a transparent liquid crystal display panel, a one-dimensional retroreflective sheet array and a light source array.
The transparent liquid crystal display panel is used for providing parallax images. The propagation direction is not changed when the light passes through the transparent liquid crystal display panel.
The one-dimensional retroreflective sheet array and the light source array are used for projecting light rays and forming a viewing area.
The transparent liquid crystal display panel and the one-dimensional retroreflective sheet array are placed back and forth. The transparent liquid crystal display panel is disposed in front of the one-dimensional array of retroreflective sheeting.
The light source array is provided with a plurality of groups of light sources, and light rays emitted by any group of light sources can be reflected and converged to a viewing area corresponding to the group of light sources through the one-dimensional retroreflective sheet array; after being reflected by the one-dimensional retroreflective sheet array, the light passes through the transparent liquid crystal display panel, so that a viewer in a viewing area can see parallax image information on the transparent liquid crystal display panel; and the space position outside the viewing area cannot be seen by the viewer due to no light projection.
When a certain group of light sources are lighted in a time division multiplexing mode, the transparent liquid crystal display panel provides parallax images corresponding to the watching area, so that the invention can respectively provide parallax images in the areas corresponding to the groups of light sources in the light source array and form three-dimensional display.
Preferably, the array of light sources is placed behind the one-dimensional array of retroreflective sheeting.
The one-dimensional retroreflective sheet array is formed by arranging a plurality of one-dimensional retroreflective sheets.
In the plane parallel to the one-dimensional retroreflective sheet, the one-dimensional retroreflective sheet can retroreflect light rays in the retroreflective direction thereof, that is, the reflected light rays in the retroreflective direction thereof are reflected according to the original incident direction; in the plane parallel to the one-dimensional retroreflective sheet, the one-dimensional retroreflective sheet diffusely reflects light in a direction orthogonal to its retroreflective direction, i.e., the reflected light is reflected in an arbitrary direction, which is defined as the one-dimensional retroreflective sheet diffusely reflecting direction.
The directions of the one-dimensional retroreflective sheets are identical; and the retroreflection directions are identical, and the diffuse reflection directions are identical.
The light emitted by any group of light sources can be reflected back to the space direction which is parallel to the diffuse reflection direction of the one-dimensional retroreflective sheet and passes through the group of light sources through the one-dimensional retroreflective sheet array, and the space direction is the viewing area corresponding to the group of light sources.
Preferably, in the light source array, any group of light sources are not single point light sources, and are formed by arranging a plurality of point light sources, and the arrangement direction of the plurality of point light sources is parallel to the diffuse reflection direction of the one-dimensional retroreflective sheet.
Preferably, in the light source array, any group of light sources is not a single point light source, and is a single strip light source, and the long axis direction of the strip light source is parallel to the diffuse reflection direction of the one-dimensional retroreflective sheet.
Each one-dimensional retroreflective sheet is not parallel to the transparent liquid crystal display panel, and the diffuse reflection direction of the one-dimensional retroreflective sheet is not parallel to the transparent liquid crystal display panel.
Because the diffuse reflection direction of each one-dimensional retroreflective sheet in the structure is not parallel to the transparent liquid crystal display panel, when a viewer moves back and forth along the diffuse reflection direction of the one-dimensional retroreflective sheet, the viewing area corresponding to any group of light sources can cover different space positions in front and back directions.
Finally, according to the invention, the viewing areas formed by any group of light sources cover different front and rear spatial positions, so that viewers can see identical parallax images at different viewing distances.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic diagram of the structure of a one-dimensional retroreflective sheet according to the present invention.
Fig. 3 is a schematic diagram of the display principle of the present invention.
Icon: 100-transparent liquid crystal display panel; 200-a one-dimensional array of retroreflective sheeting; 300-an array of light sources; 210-one-dimensional retroreflective sheeting; 211-cubic retroreflective layer; 212-a cylindrical lens grating; 310-a first set of light sources; 320-a second light source group; 330-a third light source group; 340-fourth light source group.
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 time division multiplexing stereoscopic display device according to the present embodiment. In fig. 1, x is defined as a front-back direction in space, wherein a positive x direction is back, a negative x direction is front, y is a horizontal direction in space, z is a vertical direction in space, and k is a diffuse reflection direction of the one-dimensional retroreflective sheet.
The time division multiplexing stereoscopic display device is composed of a transparent liquid crystal display panel 100, a one-dimensional retroreflective sheet array 200, and a light source array 300.
The transparent liquid crystal display panel 100 is used to provide parallax images. The propagation direction is not changed when the light passes through the transparent liquid crystal display panel 100.
The one-dimensional array of retroreflective sheeting 200 and the array of light sources 300 are used to project light and form a viewing area. The light source array 300 is disposed behind the one-dimensional retroreflective sheet array 200, and includes 4 light sources, namely a first light source set 310, a second light source set 320, a third light source set 330 and a fourth light source set 340.
The transparent liquid crystal display panel 100 and the one-dimensional retroreflective sheet array 200 are placed back and forth. The transparent liquid crystal display panel 100 is placed in front of the one-dimensional array of retroreflective sheets 200.
The light source array 300 is provided with a plurality of groups of light sources, and light rays emitted by any group of light sources can be reflected and converged to a viewing area corresponding to the group of light sources through the one-dimensional retroreflective sheet array 200; after being reflected by the one-dimensional retroreflective sheet array 200, the light passes through the transparent liquid crystal display panel 100, so that a viewer in the viewing area can see parallax image information on the transparent liquid crystal display panel 100; and the space position outside the viewing area cannot be seen by the viewer due to no light projection.
When a certain group of light sources is turned on in a time division multiplexing manner, the transparent liquid crystal display panel 100 provides parallax images corresponding to the viewing area, so that the present invention can provide parallax images in the areas corresponding to the groups of light sources in the light source array 300, respectively, and form stereoscopic display.
The one-dimensional retroreflective sheet array 200 is formed by arranging a plurality of one-dimensional retroreflective sheets 210.
Referring to fig. 2, in a plane k-y parallel to the one-dimensional retroreflective sheet 210, the one-dimensional retroreflective sheet 210 retroreflects light in its retroreflective direction y, that is, in its retroreflective direction y, the reflected light is reflected according to the original incident direction; and the one-dimensional retroreflective sheet 210 diffusely reflects light in a direction k orthogonal to its retroreflective direction.
Referring to fig. 2, a one-dimensional retroreflective sheet 210 is formed by combining a cubic retroreflective layer 211 and a lenticular lens grating 212. The cubic retroreflective layer 211 can reflect light in the original incident direction. The cylindrical lens grating 212 has the long axis of each cylindrical lens in the y direction, and each cylindrical lens is arranged in the k direction, where k is orthogonal to y. Since the directions of the incident light and the reflected light are parallel but there is a displacement in the cubic structure, it can be scattered in the k direction when passing through the lenticular 212. And the light is reflected according to the original incident direction because no scattering effect exists in the y direction. Finally, the one-dimensional retroreflective sheet 210 has a retroreflective direction of y and a diffuse reflective direction of k. Referring to fig. 2, the light emitted by the first light source group 310 at different positions in the y direction may be reflected and converged at the position of the first light source group 310 after passing through the one-dimensional retroreflective sheet 210; the light emitted by the second light source group 320 can be reflected and converged at the position of the second light source group 320 after passing through the one-dimensional retroreflective sheet 210.
To improve the scattering power of the lenticular 212 for light, the smaller the ratio of focal length to pitch is, the better.
The present embodiment exemplifies only one-dimensional retroreflective sheet 210 formed by combining a cubic retroreflective layer 211 and a lenticular lens 212, and may be formed in other ways, and the present embodiment will not be described again.
The directions of the one-dimensional retroreflective sheets 210 are identical; and the retroreflection directions are identical, and the diffuse reflection directions are identical.
Light emitted by any one of the light sources can be retroreflected by the one-dimensional retroreflective sheet array 200 to a spatial direction that is parallel to the diffuse reflection direction k of the one-dimensional retroreflective sheet 210 and that is the viewing area corresponding to the one-dimensional retroreflective sheet array.
The first light source group 310, the second light source group 320, the third light source group 330 and the fourth light source group 340 are elongated light sources, and the long axis direction of the elongated light sources is parallel to the diffuse reflection direction k of the one-dimensional retroreflective sheet.
Therefore, referring to fig. 3, the light emitted by the first light source set 310 is reflected by the one-dimensional retroreflective sheet array 200 and then converged at the position of the straight line k 1; the light rays emitted by the second light source group 320 are reflected by the one-dimensional retroreflective sheet array 200 and then converged at the position of a straight line k 2; the light rays emitted by the third light source group 330 are reflected by the one-dimensional retroreflective sheet array 200 and then converged at the position of a straight line k 3; the light rays emitted by the fourth light source group 340 are reflected by the one-dimensional retroreflective sheet array 200 and then converged at the position of the straight line k 4. k1, k2, k3, and k4 are all parallel to the diffuse reflection direction k of the one-dimensional retroreflective sheet 210.
Referring to fig. 1, each one-dimensional retroreflective sheet 210 is not parallel to the transparent liquid crystal display panel 100, and the diffuse reflective direction k of the one-dimensional retroreflective sheet 210 is not parallel to the transparent liquid crystal display panel 100.
Since the diffuse reflection direction k of each one-dimensional retroreflective sheet 210 in the above-described structure is not parallel to the transparent liquid crystal display panel 100, when the viewer moves back and forth along the diffuse reflection direction k of the one-dimensional retroreflective sheet 210, the viewing area corresponding to any one group of light sources can cover different front and back spatial positions.
Finally, according to the invention, the viewing areas formed by any group of light sources cover different front and rear spatial positions, so that viewers can see identical parallax images at different viewing distances.
Claims (4)
1. A time division multiplexed stereoscopic display device characterized by:
the time division multiplexing stereoscopic display device consists of a transparent liquid crystal display panel, a one-dimensional retroreflective sheet array and a light source array;
the transparent liquid crystal display panel is used for providing parallax images; the propagation direction is not changed when the light passes through the transparent liquid crystal display panel;
the one-dimensional retroreflective sheet array and the light source array are used for projecting light rays and forming a viewing area;
the transparent liquid crystal display panel and the one-dimensional retroreflective sheet array are placed back and forth; the transparent liquid crystal display panel is arranged in front of the one-dimensional retroreflective sheet array;
the light source array is provided with a plurality of groups of light sources, and light rays emitted by any group of light sources are reflected and converged to a viewing area corresponding to the group of light sources through the one-dimensional retroreflective sheet array; after being reflected by the one-dimensional retroreflective sheet array, the light passes through the transparent liquid crystal display panel, so that a viewer in a viewing area can see parallax image information on the transparent liquid crystal display panel; the space position outside the watching area cannot be seen by the viewer due to no light projection;
when a certain group of light sources are lighted up, the transparent liquid crystal display panel provides parallax images corresponding to the watching areas in a time division multiplexing mode;
the one-dimensional retroreflective sheet array is formed by arranging a plurality of one-dimensional retroreflective sheets;
in a plane parallel to the one-dimensional retroreflective sheet, the one-dimensional retroreflective sheet retroreflects light in its retroreflective direction, that is, reflects light in its retroreflective direction in accordance with the original incident direction; in the plane parallel to the one-dimensional retroreflective sheet, the one-dimensional retroreflective sheet diffusely reflects light in a direction orthogonal to its retroreflective direction, i.e., the reflected light is reflected in an arbitrary direction, which is defined as the one-dimensional retroreflective sheet diffusely reflecting direction;
the directions of the one-dimensional retroreflective sheets are identical; the retroreflection directions are identical, and the diffuse reflection directions are identical;
light rays emitted by any group of light sources are reversely reflected to a space direction which passes through the group of light sources and is parallel to the diffuse reflection direction of the one-dimensional retroreflective sheet through the one-dimensional retroreflective sheet array, and the space direction is a viewing area corresponding to the group of light sources;
each one-dimensional retroreflective sheet is not parallel to the transparent liquid crystal display panel, and the diffuse reflection direction of the one-dimensional retroreflective sheet is not parallel to the transparent liquid crystal display panel.
2. A time division multiplexed stereoscopic display apparatus according to claim 1, wherein: the array of light sources is positioned behind the array of one-dimensional retroreflective sheeting.
3. A time division multiplexed stereoscopic display apparatus according to claim 1, wherein: in the light source array, any group of light sources are not single point light sources, and the light sources are formed by arranging a plurality of point light sources, so that the arrangement direction of the point light sources is parallel to the diffuse reflection direction of the one-dimensional retroreflective sheet.
4. A time division multiplexed stereoscopic display apparatus according to claim 1, wherein: in the light source array, any group of light sources are not single point light sources, and are single strip light sources, so that the long axis direction of the strip light sources is parallel to the diffuse reflection direction of the one-dimensional retroreflective sheet.
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| CN202310776974.8A CN116500803B (en) | 2023-06-29 | 2023-06-29 | Time division multiplexing stereoscopic display device |
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| CN202310776974.8A CN116500803B (en) | 2023-06-29 | 2023-06-29 | Time division multiplexing stereoscopic display device |
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| CN108051927A (en) * | 2018-02-07 | 2018-05-18 | 成都工业学院 | A kind of 3D display device |
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