阅读说明：本技术 基于阶梯渐变孔径偏振狭缝光栅的3d显示装置 (3D display device based on step gradual change aperture polarization slit grating ) 是由 吴非 樊为 高燕 范钧 陈章达 谢了尖 徐雯 任洪娇 曾星 于 2021-09-11 设计创作，主要内容包括：本发明公开了基于阶梯渐变孔径偏振狭缝光栅的3D显示装置,包括显示屏、阶梯渐变孔径偏振狭缝光栅I和阶梯渐变孔径偏振狭缝光栅II；位于阶梯渐变节距图像元阵列中间的连续多个图像元的节距均相同；阶梯渐变节距图像元阵列中图像元的节距从中间到两边阶梯式增大；每个图像元发出的一部分光线经过阶梯渐变孔径偏振狭缝光栅I,且被阶梯渐变孔径偏振狭缝光栅I调制成具有相同偏振方向的偏振光I,偏振光I通过与该图像元对应的透光狭缝II投射到成像空间；每个图像元发出的一部分光线通过与该图像元对应的透光狭缝I,经过阶梯渐变孔径偏振狭缝光栅II投射到成像空间；在观看区域形成一个高成像效率和宽视角的3D图像。(The invention discloses a 3D display device based on a stepped gradient aperture polarization slit grating, which comprises a display screen, a stepped gradient aperture polarization slit grating I and a stepped gradient aperture polarization slit grating II, wherein the display screen is provided with a plurality of display screens; the pitches of a plurality of image elements located in the middle of the image element array with the step gradual change pitch are the same; the pitch of the image elements in the array of step-wise gradient pitch image elements increases stepwise from the middle to both sides; part of light rays emitted by each image element pass through the stepped gradient aperture polarization slit grating I and are modulated into polarized light I with the same polarization direction by the stepped gradient aperture polarization slit grating I, and the polarized light I is projected to an imaging space through a light-transmitting slit II corresponding to the image element; a part of light emitted by each image element passes through a light-transmitting slit I corresponding to the image element and is projected to an imaging space through a stepped gradient aperture polarization slit grating II; A3D image with high imaging efficiency and wide viewing angle is formed in a viewing area.)

1. The 3D display device based on the stepped gradient aperture polarization slit grating is characterized by comprising a display screen, a stepped gradient aperture polarization slit grating I and a stepped gradient aperture polarization slit grating II; the display screen, the stepped gradient aperture polarization slit grating I and the stepped gradient aperture polarization slit grating II are sequentially arranged in parallel; the step gradient aperture polarization slit grating I is tightly attached to the step gradient aperture polarization slit grating II; the polarization direction of the stepped gradient aperture polarization slit grating I is orthogonal to that of the stepped gradient aperture polarization slit grating II; the step gradient aperture polarization slit grating I is provided with a light-transmitting slit I; the step gradient aperture polarization slit grating II is provided with a light-transmitting slit II; the display screen is used for displaying the step gradual change pitch image element array; the pitches of a plurality of image elements located in the middle of the image element array with the step gradual change pitch are the same; the pitch of the image elements in the array of step-wise gradient pitch image elements increases stepwise from the middle to both sides; part of light rays emitted by each image element pass through the stepped gradient aperture polarization slit grating I and are modulated into polarized light I with the same polarization direction by the stepped gradient aperture polarization slit grating I, and the polarized light I is projected to an imaging space through a light-transmitting slit II corresponding to the image element; a part of light emitted by each image element passes through a light-transmitting slit I corresponding to the image element and is projected to an imaging space through a stepped gradient aperture polarization slit grating II; A3D image with high imaging efficiency and wide viewing angle is formed in a viewing area.

2. The stepped aperture polarization slit grating-based 3D display device according to claim 1, wherein the number of light-transmitting slits I corresponding to a single image element is the same, and the number of light-transmitting slits II corresponding to a single image element is the same.

3. The stepped aperture polarization slit grating based 3D display device of claim 2, wherein the number of light transmitting slits I corresponding to a single image element is one more than the number of light transmitting slits II; the light-transmitting slits I and the light-transmitting slits II corresponding to the same image element are alternately alternated, and the interval width of the adjacent light-transmitting slits I corresponding to the same image element is equal to the aperture width of the light-transmitting slits II corresponding to the image element; the light-transmitting slits I and the light-transmitting slits II corresponding to the same image element are symmetrically arranged by taking the center of the image element as a center; and a firstiAperture width of light transmission slit I corresponding to each image elementw _i And a firstiAperture width of light transmission slit II corresponding to each image elementv _i Satisfies the following formula

Wherein the content of the first and second substances,p _i is the firstiThe pitch of the individual picture elements is such that,nis the number of light-transmitting slits I corresponding to a single picture element,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

4. The stepped gradient aperture polarization slit grating-based 3D display device of claim 3, wherein the imaging efficiency of the stepped gradient aperture polarization slit grating-based 3D display devicekIs composed of

Wherein the content of the first and second substances,nis the number of light-transmitting slits I corresponding to a single picture element,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

5. The stepped aperture polarization slit grating-based 3D display device of claim 3, wherein the first step is a gradual aperture polarization slit gratingiPitch of picture elementsp _i And a firstiAperture width of light transmission slit I corresponding to each image elementw _i And a firstiAperture width of light transmission slit II corresponding to each image elementv _i Satisfies the following formula

Wherein the content of the first and second substances,nis the number of light-transmitting slits I corresponding to a single picture element.

6. The stepped aperture polarization slit grating-based 3D display device of claim 3, wherein the first step is a gradual aperture polarization slit gratingiPitch of picture elementsp _i And a firsti+aPitch of picture elementsp _{i a+}Satisfies the following formula:

wherein the content of the first and second substances,ais the number of consecutive picture elements of the same pitch located in the middle of the array of picture elements of step-wise gradient pitch,nis the number of light-transmitting slits I corresponding to a single picture element,mis the number of picture elements that are to be processed,lis the viewing distance, the distance between the viewer,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

7. The stepped gradient aperture polarization slit grating-based 3D display device of claim 6, wherein a viewing perspective of the stepped gradient aperture polarization slit grating-based 3D display deviceθIs composed of

Wherein the content of the first and second substances,ais the number of consecutive picture elements of the same pitch located in the middle of the array of picture elements of step-wise gradient pitch,mis the number of picture elements that are to be processed,is the firstThe pitch of the individual picture elements is such that,nis the number of light-transmitting slits I corresponding to a single picture element,lis the viewing distance, the distance between the viewer,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Technical Field

The invention relates to 3D display, in particular to an integrated imaging 3D display device based on a step gradual aperture polarization slit grating.

Background

The integrated imaging records the information of the 3D scene to a photosensitive film, and projects the information on the photosensitive film to an imaging space by utilizing the principle of reversible light path, thereby reconstructing the 3D scene. Compared with other 3D displays, the integrated imaging 3D display has the advantages of continuous viewing viewpoints, no need of vision-aiding equipment and coherent light and the like. In the prior art, the step gradual change pitch pinhole array is adopted to reduce the pitch change times, so that the manufacturing difficulty and cost of the traditional gradual change pitch pinhole array are reduced. The horizontal pitches of the pinholes in the same row in the step gradual change pitch pinhole array are the same; the vertical pitches of the pinholes in the step gradual change pitch pinhole array are the same; the horizontal pitches of continuous rows of pinholes in the middle of the step gradual change pitch pinhole array are the same; the horizontal pitch of the step gradual pitch pinhole array is gradually increased from the center to the left side and the right side. Occlusion exists in integrated imaging 3D displays based on a stepped gradient pitch pinhole array. Imaging efficiency is a parameter that measures the effect of occlusion on viewing. The horizontal and vertical aperture widths of the pinholes typically do not exceed 20% of the corresponding image element horizontal and vertical pitches. Thus, the imaging efficiency of the prior art solution does not exceed 4%.

Disclosure of Invention

The invention provides a 3D display device based on a stepped gradient aperture polarization slit grating, which is characterized by comprising a display screen, a stepped gradient aperture polarization slit grating I and a stepped gradient aperture polarization slit grating II, wherein the display screen is as shown in figure 1; the display screen, the stepped gradient aperture polarization slit grating I and the stepped gradient aperture polarization slit grating II are sequentially arranged in parallel; the step gradient aperture polarization slit grating I is tightly attached to the step gradient aperture polarization slit grating II; the polarization direction of the stepped gradient aperture polarization slit grating I is orthogonal to that of the stepped gradient aperture polarization slit grating II; the step gradient aperture polarization slit grating I is provided with a light-transmitting slit I as shown in figure 2; the step gradient aperture polarization slit grating II is provided with a light-transmitting slit II as shown in figure 3; the display screen is used for displaying the step gradual change pitch image element array; the pitches of a plurality of image elements located in the middle of the image element array with the step gradual change pitch are the same; the pitch of the image elements in the array of step-wise gradient pitch image elements increases stepwise from the middle to both sides; part of light rays emitted by each image element pass through the stepped gradient aperture polarization slit grating I and are modulated into polarized light I with the same polarization direction by the stepped gradient aperture polarization slit grating I, and the polarized light I is projected to an imaging space through a light-transmitting slit II corresponding to the image element; a part of light emitted by each image element passes through a light-transmitting slit I corresponding to the image element and is projected to an imaging space through a stepped gradient aperture polarization slit grating II; A3D image with high imaging efficiency and wide viewing angle is formed in a viewing area.

Preferably, the number of the light-transmitting slits I corresponding to a single image element is the same, and the number of the light-transmitting slits II corresponding to a single image element is the same.

Preferably, the number of light-transmitting slits I corresponding to a single image element is one more than the number of light-transmitting slits II; the light-transmitting slits I and the light-transmitting slits II corresponding to the same image element are alternately alternated, and the interval width of the adjacent light-transmitting slits I corresponding to the same image element is equal to the aperture width of the light-transmitting slits II corresponding to the image element; the light-transmitting slits I and the light-transmitting slits II corresponding to the same image element are symmetrically arranged by taking the center of the image element as a center; and a firstiAperture width of light transmission slit I corresponding to each image elementw _i And a firstiAperture width of light transmission slit II corresponding to each image elementv _i Satisfies the following formula

（1）

（2）

Wherein the content of the first and second substances,p _i is the firstiThe pitch of the individual picture elements is such that,nis the number of light-transmitting slits I corresponding to a single picture element,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Preferably, the imaging efficiency of the 3D display device based on the step gradient aperture polarization slit gratingkIs composed of

（3）

Wherein the content of the first and second substances,nis the number of light-transmitting slits I corresponding to a single picture element,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Preferably, the firstiPitch of picture elementsp _i And a firstiAperture width of light transmission slit I corresponding to each image elementw _i And a firstiAperture width of light transmission slit II corresponding to each image elementv _i Satisfies the following formula

（4）

Wherein the content of the first and second substances,nis the number of light-transmitting slits I corresponding to a single picture element.

Preferably, the firstiPitch of picture elementsp _i And a firsti+aPitch of picture elementsp _{i a+}Satisfies the following formula:

（5）

wherein the content of the first and second substances,ais the number of consecutive picture elements of the same pitch located in the middle of the array of picture elements of step-wise gradient pitch,nis the number of light-transmitting slits I corresponding to a single picture element,mis the number of picture elements that are to be processed,lis the viewing distance, the distance between the viewer,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Preferably, the 3D display device based on the step gradient aperture polarization slit grating has a viewing angleθIs composed of

（6）

Wherein the content of the first and second substances,ais the number of consecutive picture elements of the same pitch located in the middle of the array of picture elements of step-wise gradient pitch,mis the number of picture elements that are to be processed,is the firstThe pitch of the individual picture elements is such that,nis the number of light-transmitting slits I corresponding to a single picture element,lis the viewing distance, the distance between the viewer,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Drawings

FIG. 1 is a schematic view of the present invention

FIG. 2 is a schematic diagram of a stepped gradient aperture polarization slit grating I of the present invention

FIG. 3 is a schematic diagram of a stepped gradient aperture polarization slit grating II of the present invention

The reference numbers in the figures are:

1. the display screen, 2, the gradient aperture polarizing slit grating I, 3, the gradient aperture polarizing slit grating II, 4, the light-transmitting slit I, 5, the light-transmitting slit II.

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 invention. It should be noted that the following examples are only for illustrative purposes and should not be construed as limiting the scope of the present invention, and that the skilled person in the art may make modifications and adaptations of the present invention without departing from the scope of the present invention.

The invention provides a 3D display device based on a stepped gradient aperture polarization slit grating, which is characterized by comprising a display screen, a stepped gradient aperture polarization slit grating I and a stepped gradient aperture polarization slit grating II, wherein the display screen is as shown in figure 1; the display screen, the stepped gradient aperture polarization slit grating I and the stepped gradient aperture polarization slit grating II are sequentially arranged in parallel; the step gradient aperture polarization slit grating I is tightly attached to the step gradient aperture polarization slit grating II; the polarization direction of the stepped gradient aperture polarization slit grating I is orthogonal to that of the stepped gradient aperture polarization slit grating II; the step gradient aperture polarization slit grating I is provided with a light-transmitting slit I as shown in figure 2; the step gradient aperture polarization slit grating II is provided with a light-transmitting slit II as shown in figure 3; the display screen is used for displaying the step gradual change pitch image element array; the pitches of a plurality of image elements located in the middle of the image element array with the step gradual change pitch are the same; the pitch of the image elements in the array of step-wise gradient pitch image elements increases stepwise from the middle to both sides; part of light rays emitted by each image element pass through the stepped gradient aperture polarization slit grating I and are modulated into polarized light I with the same polarization direction by the stepped gradient aperture polarization slit grating I, and the polarized light I is projected to an imaging space through a light-transmitting slit II corresponding to the image element; a part of light emitted by each image element passes through a light-transmitting slit I corresponding to the image element and is projected to an imaging space through a stepped gradient aperture polarization slit grating II; A3D image with high imaging efficiency and wide viewing angle is formed in a viewing area.

Preferably, the number of the light-transmitting slits I corresponding to a single image element is the same, and the number of the light-transmitting slits II corresponding to a single image element is the same.

Preferably, the number of light-transmitting slits I corresponding to a single image element is one more than the number of light-transmitting slits II; the light-transmitting slits I and the light-transmitting slits II corresponding to the same image element are alternately alternated, and the interval width of the adjacent light-transmitting slits I corresponding to the same image element is equal to the aperture width of the light-transmitting slits II corresponding to the image element; the light-transmitting slits I and the light-transmitting slits II corresponding to the same image element are symmetrically arranged by taking the center of the image element as a center; and a firstiAperture width of light transmission slit I corresponding to each image elementw _i And a firstiAperture width of light transmission slit II corresponding to each image elementv _i Satisfies the following formula

（1）

（2）

Wherein the content of the first and second substances,p _i is the firstiThe pitch of the individual picture elements is such that,nis the number of light-transmitting slits I corresponding to a single picture element,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Preferably, the imaging efficiency of the 3D display device based on the step gradient aperture polarization slit gratingkIs composed of

（4）

Wherein the content of the first and second substances,nis the number of light-transmitting slits I corresponding to a single picture element,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Preferably, the firstiPitch of picture elementsp _i And a firstiAperture width of light transmission slit I corresponding to each image elementw _i And a firstiAperture width of light transmission slit II corresponding to each image elementv _i Satisfies the following formula

（4）

Wherein the content of the first and second substances,nis the number of light-transmitting slits I corresponding to a single picture element.

Preferably, the firstiPitch of picture elementsp _i And a firsti+aPitch of picture elementsp _{i a+}Satisfies the following formula:

（5）

wherein the content of the first and second substances,ais the number of consecutive picture elements of the same pitch located in the middle of the array of picture elements of step-wise gradient pitch,nis the number of light-transmitting slits I corresponding to a single picture element,mis the number of picture elements that are to be processed,lis the viewing distance, the distance between the viewer,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

Preferably, the 3D display device based on the step gradient aperture polarization slit grating has a viewing angleθIs composed of

（6）

Wherein the content of the first and second substances,ais the number of consecutive picture elements of the same pitch located in the middle of the array of picture elements of step-wise gradient pitch,mis the number of picture elements that are to be processed,is the firstThe pitch of the individual picture elements is such that,nis the number of light-transmitting slits I corresponding to a single picture element,lis the viewing distance, the distance between the viewer,gis the distance between the display screen and the stepped aperture-gradual-change polarizing slit grating I,sis the thickness of the step gradient aperture polarization slit grating I,tis the thickness of the step gradient aperture polarization slit grating II.

The number of the image elements is 6, the number of the continuous image elements with the same pitch positioned in the middle of the image element array with the step gradual change pitch is 2, the pitch of the 3 rd image element is 9mm, the number of the light-transmitting slits I corresponding to a single image element is 2, the number of the light-transmitting slits II corresponding to a single image element is 1, the thickness of the step gradual change aperture polarization slit grating I is 2mm, the thickness of the step gradual change aperture polarization slit grating II is 3mm, and the viewing distance is 271mm, then the distance between the display screen and the step gradual change aperture polarization slit grating I is 4mm calculated by the formulas (1), (2), (4) and (5); the pitches of the 1 st to 6 th image elements in the step gradual change pitch image element array are respectively 10mm, 9mm, 10mm and 10 mm; the aperture widths of the light-transmitting slits I corresponding to the 1 st to 6 th image elements are respectively 1.3mm, 1.2mm, 1.3mm and 1.3 mm; the aperture widths of the light-transmitting slits II corresponding to the 1 st to 6 th image elements are respectively 2mm, 1.8mm, 2mm and 2 mm; the imaging efficiency calculated from formula (3) was 46%; the viewing angle was calculated from equation (6) to be 62%.