CN104020573B - A multi-viewpoint 3D display device based on orthogonal polarization directional backlight - Google Patents

Abstract

The present invention proposes a kind of multiple views 3D display device based on orthogonal polarization orientation backlight.This device is made up of cross polarization light source, slit grating and 2D display panels, and places successively.Cross polarization backlight and slit grating constitute orthogonal polarization orientation backlight, utilize the light-dividing principle of slit grating, and the light in the different polarization direction on cross polarization backlight can project in different horizontal directions.When the different cross polarization light of these projecting directions acts on 2D display panels, the pixel of odd-numbered line or sub-pixel can be projected onto some directions, and the pixel of even number line or sub-pixel can be projected onto other directions, thus provide anaglyph for different viewpoints.Compare with the same number of traditional slit grating 3D display of viewpoint, this device can be improved the standard resolution, promotes the display quality of image.

Description

A multi-viewpoint 3D display device based on orthogonal polarization directional backlight

technical field

The present invention relates to 3D display technology, more specifically, the present invention relates to multi-viewpoint 3D display technology.

Background technique

The slit grating 3D display is a low-cost grating 3D display that does not require any visual aids. It projects pixels in different areas on the 2D display panel to different horizontal directions through vertical light-transmitting strips, thereby realizing 3D display. The multi-view slit grating 3D display can provide multiple parallax images in multiple directions, thereby providing a better stereoscopic viewing experience. A multi-view slit grating 3D display device usually consists of a 2D display panel and a slit grating. The 2D display panel is used to provide N ( N is greater than 2) parallax images from the same stereoscopic scene. The slit grating uses the principle of light blocking to combine these Parallax images are split horizontally to form different viewpoints. When the viewer's eyes are at different viewpoints, they can watch the corresponding parallax images, thereby realizing the stereoscopic effect. However, the horizontal resolution (the number of pixels in each row of the image) of the image seen by the viewer is 1/ N of that of the 2D display, while its vertical resolution (the number of pixels in each column of the image) remains the same. The difference in rate will deteriorate the display quality of the image.

Contents of the invention

The invention proposes a multi-viewpoint 3D display device based on an orthogonally polarized directional backlight source. As shown in Figure 1, the device consists of an orthogonally polarized light source, a slit grating and a 2D display panel, and the slit grating is placed between the orthogonally polarized light source and the 2D display panel. Orthogonal polarized light source is composed of strip light sources with the same width alternately arranged in one-dimensional direction, the polarization directions of adjacent strip light sources are orthogonal, and the distance between a certain strip light source and two adjacent strip light sources is not equal . The polarization directions of adjacent pixel rows on the 2D display panel are orthogonal. The long axis direction of the strip light source in the orthogonally polarized light source is parallel to the slit direction of the slit grating and perpendicular to the pixel row direction on the 2D display panel.

Accompanying drawing 2 is the schematic diagram of the structure of the device of the present invention. The strip light source with different polarization directions on the orthogonally polarized light source has a specific projection direction after being modulated by the slit, and the pixels corresponding to the polarization direction on the 2D display panel can be aligned in the specified direction. displayed on the Assuming that the width of the strip light source of the device of the present invention is W _s , the distance between a certain strip light source and two adjacent strip light sources is D _s and P _s respectively, the slit width of the slit grating is W _b , and the grating pitch P _b , the pixel width of the 2D display panel is W _p , the distance between adjacent viewpoints is V , the distance from the orthogonally polarized light source to the slit grating is d ₁ , the distance from the slit grating to the 2D display panel is d ₂ , 2D The optimal viewing distance from the display panel to the viewpoint is d ₃ , and the number of parallax images displayed by the device of the present invention is N. Preferably, these parameters should satisfy:

(1)

(2)

(3)

(4)

(5)

(6)

(7)

In the formula, k is any positive integer, and E is the interpupillary distance of the human eye.

N viewpoints arranged horizontally are formed at the optimal viewing distance of the device of the present invention. When the viewer's left eye and right eye are respectively at different viewpoints, different parallax images corresponding to the viewpoints can be seen, thereby generating a stereoscopic effect . If the resolution of the 2D display panel is X × Y , the resolution of the corresponding parallax image at each viewpoint is (2 X / N ) × ( Y /2).

Compared with the traditional slit grating 3D display with the same number of viewpoints, the device of the invention can improve the horizontal resolution, thereby improving the display quality of images.

4. Description of drawings

Accompanying drawing 1 is the structural diagram of the present invention, wherein the single arrow indicates the polarization direction of the light source and the pixel of the 2D display panel.

Accompanying drawing 2 is the schematic diagram of the structure of the present invention, wherein the black part of the orthogonally polarized light source indicates that there is no strip light source here.

Accompanying drawing 3 is the illuminance distribution diagram of the orthogonal polarization directional backlight of the present invention at the optimum viewing distance.

Accompanying drawing 4 is the luminance distribution diagram of the device of the present invention at the optimal viewing distance.

The pictorial labels in the above-mentioned accompanying drawings are:

1. Orthogonal polarized light source, 2. Slit grating, 3.2D display panel.

It should be understood that the above drawings are only schematic and not drawn to scale.

5. Specific implementation

A typical embodiment of the multi-viewpoint 3D display device based on the orthogonal polarization directional backlight of the present invention is used in detail below to further specifically describe the present invention. It is necessary to point out that the following examples are only used for further description of the present invention, and cannot be interpreted as limiting the protection scope of the present invention, and those skilled in the art make some non-essential improvements to the present invention according to the above-mentioned content of the present invention And adjustments still belong to the protection scope of the present invention.

A multi-viewpoint 3D display device based on an orthogonally polarized directional backlight is composed of an orthogonally polarized light source, a slit grating and a 2D display panel, and the slit grating is placed between the orthogonally polarized light source and the 2D display panel. Orthogonal polarized light source is composed of strip light sources with the same width alternately arranged in one-dimensional direction, the polarization directions of adjacent strip light sources are orthogonal, and the distance between a certain strip light source and two adjacent strip light sources is not equal . The polarization directions of adjacent pixel rows on the 2D display panel are orthogonal. The long axis direction of the strip light source in the orthogonally polarized light source is parallel to the slit direction of the slit grating and perpendicular to the pixel row direction on the 2D display panel. In the orthogonally polarized backlight, the width of the strip light source W _s =0.285mm, the distance between a strip light source and two adjacent strip light sources is D _s =0.263mm and P _s =0.833mm, the slit The grating slit width W _b =0.562mm, the grating pitch P _b =1.64mm, the pixel width on the 2D display panel is W _p =0.42mm, the distance between adjacent viewpoints V =65mm, the distance from the orthogonally polarized light source to the slit grating d ₁ =5mm, the distance from the slit grating to the 2D display panel d ₂ =2mm, and the optimal viewing distance from the 2D display panel to the viewpoint d ₃ =388mm.

In the example, the corresponding relationship of the above parameters satisfies:

(1)

(2)

(3)

(4)

(5)

(6)

(7)

In this example, k = 1, E = 65mm.

At the optimal viewing distance of the device of the present invention, 8 viewpoints arranged horizontally are formed. When the viewer's left eye and right eye are at different viewpoints, different parallax images corresponding to the viewpoints can be seen, thereby generating a stereoscopic effect . In the example, the resolution of the 2D display panel is 960×600, and the resolution of the corresponding parallax image at each viewpoint is 240×300.

Accompanying drawing 3 is the illuminance distribution diagram of the orthogonally polarized directional backlight of the present invention on the best viewing distance, the abscissa x is the displacement in the horizontal direction on the best viewing distance, and the ordinate is the orthogonal polarization directional backlight relative illuminance. It can be seen from FIG. 3 that at the point of view indicated by the dot, there is only illumination distribution in the same polarization direction, so there will be no crosstalk between light sources with different polarization directions.

Accompanying drawing 4 is the relative brightness distribution of each parallax image on the best viewing distance of the multi-viewpoint 3D display device based on the orthogonal polarization directional backlight of the present invention, the abscissa x is the displacement in the horizontal direction on the best viewing distance, and the vertical The coordinates are the relative brightness of each disparity image. It can be seen from FIG. 4 that the viewing zones corresponding to each parallax image are arranged sequentially in the horizontal direction, and there is no crosstalk between adjacent viewing zones.

Claims (2)

1. the multiple views 3D display device based on orthogonal polarization orientation backlight, by cross polarization light source, slit grating and 2D display panel composition, slit grating is positioned between cross polarization light source and 2D display panel, 2D display panel is positioned between slit grating and beholder, cross polarization light source to be upwards alternately arranged at one-dimensional square by all identical strip-shaped light source of width and to form, the polarization direction of adjacent strip-shaped light source is orthogonal, the spacing of two strip-shaped light sources that a certain strip-shaped light source is adjacent is not etc., the polarization direction of the adjacent lines of pixels on 2D display panel is orthogonal, the long axis direction of the strip-shaped light source in cross polarization light source is parallel with the slit direction of slit grating, and perpendicular to the pixel row direction on 2D display panel.

2. a kind of multiple views 3D display device based on orthogonal polarization orientation backlight according to claim 1, it is characterized in that, the width of strip-shaped light source is W _s, the spacing of two strip-shaped light sources that a certain strip-shaped light source is adjacent is respectively D _sand P _s, slit grating slit width is W _b, raster pitch is P _b, the pixel wide of 2D display panel is W _p, adjacent viewpoint spacing is V, and cross polarization light source is d to the distance of slit grating ₁, slit grating is d to the distance of 2D display panel ₂, 2D display panel is d to the viewing ratio of viewpoint ₃, anaglyph is N width, and these parameters should meet formula:

$P_s=\frac{d_{1}V}{d_3+d_2},$

D _s＝P _s-2W _s，

$W_s\≤\frac{(d_1+d_2+d_3)W_p}{d_3},$

$W_b=2\frac{(d_2+d_3)W_s}{d_1+d_2+d_3},$

$P_b=2\frac{(d_2+d_3)P_s}{d_1+d_2+d_3},$

$N=4\frac{P_s{d}_3}{(d_1+d_2+d_3)W_p},$

E＝kV，

In formula, k is any positive integer, and E is people's eye pupil pitch of holes.