CN114895481B - Double-vision 3D display device based on slit grating and polarization grating - Google Patents
Double-vision 3D display device based on slit grating and polarization grating Download PDFInfo
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- CN114895481B CN114895481B CN202210535781.9A CN202210535781A CN114895481B CN 114895481 B CN114895481 B CN 114895481B CN 202210535781 A CN202210535781 A CN 202210535781A CN 114895481 B CN114895481 B CN 114895481B
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- 230000010287 polarization Effects 0.000 title claims abstract description 112
- 208000003164 Diplopia Diseases 0.000 title description 6
- 208000029444 double vision Diseases 0.000 title description 6
- 239000011521 glass Substances 0.000 claims abstract description 36
- 238000003384 imaging method Methods 0.000 claims abstract description 12
- 239000011295 pitch Substances 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- G02B30/22—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 stereoscopic type
- G02B30/25—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 stereoscopic type using polarisation techniques
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/30—Image reproducers
- H04N13/332—Displays for viewing with the aid of special glasses or head-mounted displays [HMD]
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Abstract
The invention discloses a double-view 3D display device based on a slit grating and a polarization grating, which comprises a display screen, a polarization grating, a slit grating I, a slit grating II, polarization glasses I and polarization glasses II; a part of light rays emitted by the image element I are respectively projected to an imaging area I through a polarization unit I, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images I are reconstructed, and the 3D images I are combined into a high-resolution 3D image I in a viewing area I; a part of light rays emitted by the image element II are respectively projected to an imaging area II through a polarization unit II, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images II are reconstructed, and the 3D images II are combined into a high-resolution 3D image II in a viewing area II; only the 3D image I can be seen through the polarized glasses I, and only the 3D image II can be seen through the polarized glasses II; the viewing angles of both the 3D image I and the 3D image II are proportional to the aperture width of the slit II.
Description
Technical Field
The invention relates to a 3D display technology, in particular to a double-vision 3D display device based on a slit grating and a polarization grating.
Background
Chinese patent 201910442404.9 proposes a high-resolution integrated imaging double-vision 3D display device, which comprises a display screen, a polarization array, a pinhole array, a pair of polarized glasses 1 and a pair of polarized glasses 2; the display screen is used for displaying a micro-image array, and the micro-image array is formed by alternately arranging image elements 1 and image elements 2 in the horizontal and vertical directions; the polarization array is attached to the display screen and is positioned between the display screen and the pinhole array; the pinhole array is arranged in front of the polarization array in parallel and aligned correspondingly; the pinhole array comprises a plurality of groups of light holes; the polarization array is formed by alternately arranging polarization units 1 and polarization units 2 in the horizontal direction and the vertical direction, and the polarization directions of the polarization units 1 and the polarization units 2 are orthogonal; the polarization direction of the polarized glasses 1 is the same as that of the polarized unit 1, and the polarization direction of the polarized glasses 2 is the same as that of the polarized unit 2; the pitch of the light holes, the pitch of the polarization units 1, the pitch of the polarization units 2, the pitch of the image elements 1 and the pitch of the image elements 2 are the same; the number of each group of light holes is equal to the number of image elements in the micro-image array; the spacing between two adjacent groups of light holes is the same; the plurality of light holes corresponding to the same image element 1 are symmetrical with the center of the image element 1 as the center; the plurality of light holes corresponding to the same image element 2 are symmetrical with the center of the image element 2 as the center; the thickness t of the pinhole array is
Wherein p is the pitch of the polarization unit 1, v is the vertical width of the light holes, g is the distance between the display screen and the pinhole array, z is the number of groups of light holes, and a is the vertical distance between two adjacent groups of light holes; picture element 1 is aligned correspondingly to polarization unit 1 and picture element 2 is aligned correspondingly to polarization unit 2; the image element 1 reconstructs a plurality of 3D images 1 through a plurality of groups of light holes, and the 3D images 1 are combined into a high-resolution 3D image 1 in a viewing area, and can only be seen through the polarized glasses 1; the image element 2 reconstructs a plurality of 3D images 2 through a plurality of groups of light holes, and is combined into a high-resolution 3D image 2 in the viewing area, and can only be seen through the polarized glasses 2. According to the technical scheme, the resolution of the 3D image I and the resolution of the 3D image II can be effectively improved. According to FIG. 5 of China patent 201910442404.9, the viewing angle θ 1 of the D image I and the viewing angle θ 2 of the 3D image II are calculated as
Where m is the number of image elements in the horizontal direction in the microimage array and l is the viewing distance. As can be seen from the two formulas above, on the one hand: the thickness of the pinhole in the prior art needs to meet a specific relation, and the thickness of the pinhole is in direct proportion to the vertical width of the light-transmitting pinhole; on the other hand: the horizontal viewing angles of both the 3D image I and the 3D image II of the prior art solution are inversely proportional to the thickness of the pinholes. Therefore, the application range of the prior art scheme is limited.
Disclosure of Invention
The invention provides a double-vision 3D display device based on a slit grating and a polarization grating, which is shown in a figure 1, and is characterized by comprising a display screen, the polarization grating, a slit grating I, a slit grating II, a polarization glasses I and a polarization glasses II; the display screen, the polarization grating, the slit grating I and the slit grating II are sequentially arranged in parallel; the polarization grating is attached to the display screen; the display screen is used for displaying the composite image element array; the composite image element array comprises image elements I and image elements II, as shown in figure 2; the image elements I and the image elements II are alternately arranged; the polarization grating comprises a polarization unit I and a polarization unit II, as shown in figure 3; the polarization units I and the polarization units II are alternately arranged; the polarization direction of the polarization unit I is orthogonal to the polarization direction of the polarization unit II; the number of the polarization units I is equal to the number of the image elements I, and the number of the polarization units II is equal to the number of the image elements II; the pitches of the image element I, the image element II, the polarization unit I and the polarization unit II are the same; the image elements I and the polarization units I are aligned in a one-to-one correspondence, and the image elements II and the polarization units II are aligned in a one-to-one correspondence; the polarization unit I is used for polarizing the light rays emitted by the image element I, and the polarization unit II is used for polarizing the light rays emitted by the image element II;
The slit grating I is used for modulating an optical path; the slit grating II is used for imaging; the number of slits II is equal to the number of slits I; each image element I corresponds to a plurality of slits I, and each image element I corresponds to a plurality of slits II; each image element II corresponds to a plurality of slits I, and each image element II corresponds to a plurality of slits II; the number of the slits I corresponding to each image element I, the number of the slits II corresponding to each image element I, the number of the slits I corresponding to each image element II and the number of the slits II corresponding to each image element II are the same; the plurality of slits I corresponding to each image element I are symmetrical with the center of the image element I as the center, and the plurality of slits II corresponding to each image element I are symmetrical with the center of the image element I as the center; the plurality of slits I corresponding to each image element II are symmetrical with the center of the image element II as the center, and the plurality of slits II corresponding to each image element II are symmetrical with the center of the image element II as the center; the adjacent interval width of the plurality of slits I corresponding to each image element I and the adjacent interval width of the plurality of slits I corresponding to each image element II are the same; the adjacent interval width of the plurality of slits II corresponding to each image element I and the adjacent interval width of the plurality of slits II corresponding to each image element II are the same;
The aperture width w of the slit I and the adjacent interval width a of the plurality of slits I corresponding to each image element I are calculated by the following formula
（1）
（2）
Wherein p is the pitch of the polarizing unit II, n is the number of slits I corresponding to each image element I, v is the aperture width of the slits II, b is the adjacent interval width of a plurality of slits II corresponding to each image element I, d is the interval between the slit gratings I and II, and g is the interval between the display screen and the slit grating II;
the distance d between the slit grating I and the slit grating II meets the following condition
（3）
A part of light rays emitted by the image element I are respectively projected to an imaging area I through a polarization unit I, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images I are reconstructed, and the 3D images I are combined into a high-resolution 3D image I in a viewing area I; a part of light rays emitted by the image element II are respectively projected to an imaging area II through a polarization unit II, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images II are reconstructed, and the 3D images II are combined into a high-resolution 3D image II in a viewing area II; the polarization direction of the polarized glasses I is the same as that of the polarized unit I, and the polarization direction of the polarized glasses II is the same as that of the polarized unit II; the polarized glasses I and the polarized glasses II are used for separating the 3D image I and the 3D image II; only the 3D image I can be seen through the polarized glasses I, and only the 3D image II can be seen through the polarized glasses II; the viewing angle θ 1 of the 3D image I and the viewing angle θ 2 of the 3D image II are
（4）
Where l is the viewing distance and m is the sum of the number of picture elements I and II; the viewing angles of both the 3D image I and the 3D image II are proportional to the aperture width of the slit II.
Drawings
FIG. 1 is a schematic diagram of the present invention
FIG. 2 is a schematic diagram of a composite pixel array according to the present invention
FIG. 3 is a schematic diagram of a polarization grating according to the present invention
The graphic reference numerals in the above figures are:
1. the display screen, 2 polarization gratings, 3 slit gratings, 4 slit gratings, 5 polarization glasses, 6 polarization glasses, 7 image elements, 8 image elements, 9 polarization units, and 10 polarization units.
It should be understood that the above-described figures are merely schematic and are not drawn to scale.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description of an exemplary embodiment of the present invention. It is noted that the following examples are given for the purpose of illustration only and are not to be construed as limiting the scope of the invention, since numerous insubstantial modifications and adaptations of the invention will be within the scope of the invention as viewed by one skilled in the art from the foregoing disclosure.
The invention provides a double-vision 3D display device based on a slit grating and a polarization grating, which is shown in a figure 1, and is characterized by comprising a display screen, the polarization grating, a slit grating I, a slit grating II, a polarization glasses I and a polarization glasses II; the display screen, the polarization grating, the slit grating I and the slit grating II are sequentially arranged in parallel; the polarization grating is attached to the display screen; the display screen is used for displaying the composite image element array; the composite image element array comprises image elements I and image elements II, as shown in figure 2; the image elements I and the image elements II are alternately arranged; the polarization grating comprises a polarization unit I and a polarization unit II, as shown in figure 3; the polarization units I and the polarization units II are alternately arranged; the polarization direction of the polarization unit I is orthogonal to the polarization direction of the polarization unit II; the number of the polarization units I is equal to the number of the image elements I, and the number of the polarization units II is equal to the number of the image elements II; the pitches of the image element I, the image element II, the polarization unit I and the polarization unit II are the same; the image elements I and the polarization units I are aligned in a one-to-one correspondence, and the image elements II and the polarization units II are aligned in a one-to-one correspondence; the polarization unit I is used for polarizing the light rays emitted by the image element I, and the polarization unit II is used for polarizing the light rays emitted by the image element II;
The slit grating I is used for modulating an optical path; the slit grating II is used for imaging; the number of slits II is equal to the number of slits I; each image element I corresponds to a plurality of slits I, and each image element I corresponds to a plurality of slits II; each image element II corresponds to a plurality of slits I, and each image element II corresponds to a plurality of slits II; the number of the slits I corresponding to each image element I, the number of the slits II corresponding to each image element I, the number of the slits I corresponding to each image element II and the number of the slits II corresponding to each image element II are the same; the plurality of slits I corresponding to each image element I are symmetrical with the center of the image element I as the center, and the plurality of slits II corresponding to each image element I are symmetrical with the center of the image element I as the center; the plurality of slits I corresponding to each image element II are symmetrical with the center of the image element II as the center, and the plurality of slits II corresponding to each image element II are symmetrical with the center of the image element II as the center; the adjacent interval width of the plurality of slits I corresponding to each image element I and the adjacent interval width of the plurality of slits I corresponding to each image element II are the same; the adjacent interval width of the plurality of slits II corresponding to each image element I and the adjacent interval width of the plurality of slits II corresponding to each image element II are the same;
The aperture width w of the slit I and the adjacent interval width a of the plurality of slits I corresponding to each image element I are calculated by the following formula
（1）
（2）
Wherein p is the pitch of the polarizing unit II, n is the number of slits I corresponding to each image element I, v is the aperture width of the slits II, b is the adjacent interval width of a plurality of slits II corresponding to each image element I, d is the interval between the slit gratings I and II, and g is the interval between the display screen and the slit grating II;
the distance d between the slit grating I and the slit grating II meets the following condition
（3）
A part of light rays emitted by the image element I are respectively projected to an imaging area I through a polarization unit I, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images I are reconstructed, and the 3D images I are combined into a high-resolution 3D image I in a viewing area I; a part of light rays emitted by the image element II are respectively projected to an imaging area II through a polarization unit II, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images II are reconstructed, and the 3D images II are combined into a high-resolution 3D image II in a viewing area II; the polarization direction of the polarized glasses I is the same as that of the polarized unit I, and the polarization direction of the polarized glasses II is the same as that of the polarized unit II; the polarized glasses I and the polarized glasses II are used for separating the 3D image I and the 3D image II; only the 3D image I can be seen through the polarized glasses I, and only the 3D image II can be seen through the polarized glasses II; the viewing angle θ 1 of the 3D image I and the viewing angle θ 2 of the 3D image II are
（4）
Where l is the viewing distance and m is the sum of the number of picture elements I and II; the viewing angles of both the 3D image I and the 3D image II are proportional to the aperture width of the slit II.
The pitch of the polarizing unit II is 10mm, the aperture width of the slit II is 1mm, the number of slits I corresponding to each image element I is 2, the adjacent interval width of a plurality of slits II corresponding to each image element I is 4mm, the distance between a display screen and the slit grating II is 8mm, the distance between the slit grating I and the slit grating II is 4mm, the viewing distance is 500mm, the sum of the numbers of the image elements I and the image elements II is 32, and the aperture width of the slit I is 2mm calculated by the formula (1); calculating from the formula (2), wherein the adjacent interval width of the plurality of slits I corresponding to each image element I is 3mm; the viewing angles of the 3D image I and the 3D image II calculated from the formula (4) are 42 °. In the prior art scheme based on the above parameters, the viewing angles of both the 3D image I and the 3D image II are 28 °.
Claims (1)
1. The double-view 3D display device based on the slit grating and the polarization grating is characterized by comprising a display screen, the polarization grating, the slit grating I, the slit grating II, the polarization glasses I and the polarization glasses II; the display screen, the polarization grating, the slit grating I and the slit grating II are sequentially arranged in parallel; the polarization grating is attached to the display screen; the display screen is used for displaying the composite image element array; the composite image element array comprises an image element I and an image element II; the image elements I and the image elements II are alternately arranged; the polarization grating comprises a polarization unit I and a polarization unit II; the polarization units I and the polarization units II are alternately arranged; the polarization direction of the polarization unit I is orthogonal to the polarization direction of the polarization unit II; the number of the polarization units I is equal to the number of the image elements I, and the number of the polarization units II is equal to the number of the image elements II; the pitches of the image element I, the image element II, the polarization unit I and the polarization unit II are the same; the image elements I and the polarization units I are aligned in a one-to-one correspondence, and the image elements II and the polarization units II are aligned in a one-to-one correspondence; the polarization unit I is used for polarizing the light rays emitted by the image element I, and the polarization unit II is used for polarizing the light rays emitted by the image element II; the slit grating I is used for modulating an optical path; the slit grating II is used for imaging; the number of slits II is equal to the number of slits I; each image element I corresponds to a plurality of slits I, and each image element I corresponds to a plurality of slits II; each image element II corresponds to a plurality of slits I, and each image element II corresponds to a plurality of slits II; the number of the slits I corresponding to each image element I, the number of the slits II corresponding to each image element I, the number of the slits I corresponding to each image element II and the number of the slits II corresponding to each image element II are the same; the plurality of slits I corresponding to each image element I are symmetrical with the center of the image element I as the center, and the plurality of slits II corresponding to each image element I are symmetrical with the center of the image element I as the center; the plurality of slits I corresponding to each image element II are symmetrical with the center of the image element II as the center, and the plurality of slits II corresponding to each image element II are symmetrical with the center of the image element II as the center; the adjacent interval width of the plurality of slits I corresponding to each image element I and the adjacent interval width of the plurality of slits I corresponding to each image element II are the same; the adjacent interval width of the plurality of slits II corresponding to each image element I and the adjacent interval width of the plurality of slits II corresponding to each image element II are the same; the aperture width w of the slit I and the adjacent interval width a of the plurality of slits I corresponding to each image element I are calculated by the following formula
Wherein p is the pitch of the polarizing unit II, n is the number of slits I corresponding to each image element I, v is the aperture width of the slits II, b is the adjacent interval width of a plurality of slits II corresponding to each image element I, d is the interval between the slit gratings I and II, and g is the interval between the display screen and the slit grating II;
the distance d between the slit grating I and the slit grating II meets the following condition
A part of light rays emitted by the image element I are respectively projected to an imaging area I through a polarization unit I, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images I are reconstructed, and the 3D images I are combined into a high-resolution 3D image I in a viewing area I; a part of light rays emitted by the image element II are respectively projected to an imaging area II through a polarization unit II, a plurality of corresponding slits I and a plurality of corresponding slits II, a plurality of 3D images II are reconstructed, and the 3D images II are combined into a high-resolution 3D image II in a viewing area II; the polarization direction of the polarized glasses I is the same as that of the polarized unit I, and the polarization direction of the polarized glasses II is the same as that of the polarized unit II; the polarized glasses I and the polarized glasses II are used for separating the 3D image I and the 3D image II; only the 3D image I can be seen through the polarized glasses I, and only the 3D image II can be seen through the polarized glasses II; the viewing angle θ 1 of the 3D image I and the viewing angle θ 2 of the 3D image II are
Where l is the viewing distance and m is the sum of the number of picture elements I and II; the viewing angles of both the 3D image I and the 3D image II are proportional to the aperture width of the slit II.
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