CN102375245B - Light splitting system for naked eye three-dimensional display - Google Patents

Abstract

The invention discloses a spectroscopic system for naked-eye stereoscopic display, which adopts a high-frequency image source, and sequentially arranges a first-level grating and a second-level grating in front of the optical path of the high-frequency image source, wherein the first-level grating is a diffraction grating, and the second-level grating is a Black-and-white raster, and finally get multiple sub-image sources that form a comb-like distribution in space. The light-splitting system proposed by the present invention has a good light-splitting effect, and the outgoing light of the high-frequency image source is sequentially modulated by the first-level diffraction grating and the second-level black-and-white grating, which can greatly reduce the crosstalk phenomenon existing in the parallax-based stereoscopic display.

Description

A spectroscopic system for naked-eye stereoscopic display

technical field

The invention relates to the field of naked-eye stereoscopic display optical systems, in particular to a spectroscopic system for naked-eye stereoscopic display.

Background technique

In the prior art, there are two parallax-type glasses-free three-dimensional display methods: parallax barrier (front and rear) and lenticular methods. The parallax barrier stereoscopic display technology uses a series of light-shielding stripes arranged in the vertical direction between the backlight module and the LCD panel to form a parallax barrier, which separates the images of the left eye and the right eye, so that 3D images can be obtained, and some programs install the parallax barrier in the LCD front. At present, the parallax barrier is generally realized by liquid crystal, so that by controlling the switch of the parallax barrier, 2D images are displayed when there is no parallax barrier, and 3D images are displayed when there is a parallax barrier. The downside of this technique is that the parallax barrier blocks light, which reduces the brightness of the display. In addition, the resolution of the display screen will be reduced by half (dual-viewpoint) when watching a stereoscopic image, and the resolution of a multi-viewpoint display screen will be proportionally reduced.

The lenticular lens stereoscopic display technology was first proposed by Sanyo, and later Philips put a lot of effort into research. This technology adds a layer of micro-cylindrical lens film on the LCD panel, and the lenticular lens is precisely aligned with a group of pixels of the LCD screen. Each pixel is located on the focal plane of the lenticular lens, so that different pixels are projected to different directions by the lens. The display of the pixels of the display screen can separate the visual images for the left and right eyes and send them to the left and right eyes respectively to realize 3D display. In the Philips solution, the lenticular lens is also filled with liquid crystals, which can control the refractive index of the lens, and realize 3D display when light is refracted, and 2D display when light is not refracted. Lenticular lens technology will not block the backlight, and the brightness of the display will not be affected, but because it also projects different pixels to the left and right eyes separately, which is the same as the parallax barrier technology, so the resolution will still be reduced during 3D display. rate will be doubled.

There is also a new parallax-type naked-eye stereoscopic display method. This stereoscopic display method uses a high-frequency image source to output high-frequency parallax images for the left and right eyes. Evenly distributed, and the distance between adjacent sub-image sources is equal to the width of the sub-image sources), the comb-shaped distribution forms a virtual image through the lens group, and the virtual image passes through the transflective light valve curtain, the polarized light valve curtain, the mirror, etc., The left and right eye images can be separated to form a stereoscopic display.

Contents of the invention

The object of the present invention is to provide a spectroscopic system for naked-eye stereoscopic display, which is applied in a novel parallax-type naked-eye stereoscopic display method to realize spatial modulation of light.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A spectroscopic system for naked-eye stereoscopic display, which is applied to high-frequency image source light splitting, and is characterized in that: a first-level grating and a second-level grating are sequentially arranged in front of the high-frequency image source optical path, wherein the first-level grating is a diffraction grating, and the second-level grating It is a black-and-white grating. The output light of the high-frequency image source is firstly diffracted by the first-level grating to form multiple sub-image sources that are periodically and uniformly distributed in space. Multiple sub-image sources in a shape distribution.

The spectroscopic system for naked-eye three-dimensional display is characterized in that: the first-stage grating modulates the intensity spatial distribution of the output light of the high-frequency image source, so that the light field of the output light of the high-frequency image source forms a periodic spatial distribution, Multiple sub-image sources satisfying periodic uniform distribution in space are obtained.

The spectroscopic system for naked-eye three-dimensional display is characterized in that: the secondary grating modulates the outgoing light of a plurality of sub-image sources in a spatial comb-like distribution to obtain a plurality of sub-image sources in a comb-like distribution, and the comb-like distributed In multiple sub-image source images, the distance between adjacent sub-image sources is equal to the width of a single sub-image source.

The light-splitting system proposed by the present invention has a good light-splitting effect, and the outgoing light of the high-frequency image source is sequentially modulated by the first-level diffraction grating and the second-level black-and-white grating, which can greatly reduce the crosstalk phenomenon existing in the parallax-based stereoscopic display.

Description of drawings

FIG. 1 is a schematic diagram of a naked-eye stereoscopic display spectroscopic system in the prior art.

Fig. 2 is a schematic diagram of the principle of the light splitting system of the present invention.

Fig. 3 is a schematic diagram of a comb-shaped sub-image source formed after a group and a grating.

Detailed ways

As shown in Figure 1. The outgoing light of the high-frequency image source 1 passes through the light splitting element 2 and the lens group 3 in sequence, and enters the light valve curtain 4 and is received by the left eye of the human body. After passing through the light valve curtain 4, it enters the liquid crystal light valve and reflector with polarizer After combination 5, it is received by the right eye of the human body.

This naked-eye stereoscopic display spectroscopic system must realize comb-like distribution of image sources in space to avoid crosstalk between left and right eyes. This is because the system uses a time-sharing method to display images for the left and right eyes, instead of arranging the pixels of the left and right eyes at odd and even intervals (because the arrangement of odd and even intervals will reduce the resolution). If there is no space splitting, the image seen by the left eye It will be a continuous area, and the image seen by the similar right eye is also a continuous area. In the overlapping area, the images of the left and right eyes will have serious crosstalk and cannot form a three-dimensional effect.

as shown in picture 2. The parallel light emitted by the high-frequency image source 6 is incident on the primary grating 7 (diffraction grating), and the primary grating 7 distributes the intensity of the parallel light output by the high-frequency image source 6 in space, so that the light field becomes a periodic spatial distribution, forming a A plurality of sub-image sources 8 distributed periodically. The secondary grating 9 (black-and-white grating) makes the light field of the sub-image source 8 distributed in a comb shape, forming multiple sub-image sources 10 in a comb-like distribution with the same spacing between adjacent sub-image sources and the width of the sub-image source.

As shown in Figure 3. A single high-frequency image source is divided into multiple sub-image sources after passing through the first-level grating. The spacing between adjacent sub-image sources is equal to the sub-image source width, as shown in FIG. 3 . 11 is the comb-shaped distribution diagram of the spatial sub-image source at time t0, 12 is the comb-shaped distribution diagram of the spatial sub-image source at time t1 (right eye), and 13 is the staggered distribution diagram of the spatial sub-image source at time t0 and t1.

Claims (2)

1. A spectroscopic system for naked-eye stereoscopic display, which is applied to high-frequency image source light splitting, is characterized in that: a primary grating and a secondary grating are sequentially arranged in front of the high-frequency image source optical path, wherein the primary grating is a diffraction grating, and the secondary grating is a diffraction grating. The first-level grating is a black-and-white grating. The output light of the high-frequency image source is firstly diffracted by the first-level grating to form multiple sub-image sources that are periodically and uniformly distributed in space. Form a plurality of sub-image sources in a comb-like distribution; the secondary grating modulates the outgoing light of the plurality of sub-image sources in a spatial comb-like distribution to obtain a plurality of sub-image sources in a comb-like distribution, and in the images of a plurality of sub-image sources in a comb-like distribution , the spacing between adjacent sub-image sources is equal to the width of a single sub-image source. 2. A spectroscopic system for naked-eye stereoscopic display according to claim 1, characterized in that: the first-stage grating modulates the intensity spatial distribution of the output light of the high-frequency image source, so that the output light field of the high-frequency image source into a periodic spatial distribution, and obtain multiple sub-image sources that satisfy the periodic uniform distribution in space.

Images