Shanghai DIDON Industrial Co., Ltd.

The Introduction of 3D Projection Technology

The Introduction of 3D Projection Technology
3D projection technology relies on 3D technique, the following passage is the principle of 3D technique, let's look at how do 3D projectors work.

Barrier 3D technique is also called parallax barrier or parallax barrier technology, its working principle is  similar to polarimetric 3D's, it is researched for decades by engineers of Xiapu European laboratory. Barrier 3D technique is compatible with LCD technology, so it has advantages on productivity and cost, however, its image resolution and lightness will be reduced. The implement method of barrier 3D technique is using a switching LCD, polarization film and polymer liquid crystal layer to produce a series of vertical stripes with 90°. These stripes are dozens of micron, vertical stripes are formed through their light, it is called parallax barrier. This technology is using the parallax barrier that is put on the back light unit and LCD panel, in stereoscopic mode, an image that should be seen by the left eye appears on the LCD screen, with opaque stripes blocking the right eye, in a similar way, when the image that should be seen by the right eye is displayed on the LCD screen, the opaque stripes will block the left eye. By separating the visual images of the left eye and the right eye, the viewer can see the 3D image, which is full of dreams.

Advantages: It has advantages on productivity and cost, which is suitable for civilian consumption.

Disadvantages: At low brightness, the resolution decreases inversely with the increase of the image broadcast at the same time.

Lenticular lens technology is also called biconvex lens or microcylindrical lens 3D technology. Its biggest advantage is its lightness won't be influenced. The principle of lenticular lens technology: the image plane of the LCD screen is located on the focal plane of the lens. In this way, the pixels of the image below each column lens are divided into several sub-pixels, so that the lens can project each sub-pixel in different directions. Therefore, eyes can see different sub-pixel from different angles.However, the gap between pixels will also be magnified, you can't simply superimpose sub-pixels so that the column lens is not parallel to the pixel column, but at a certain angle so that each set of sub-pixels can project the viewport repeatedly, instead of just projecting a set of parallax images.

The reason why its brightness will not be affected is that the columnar lens will not block the backlight, so the picture brightness can be well guaranteed,However, the basic principle of 3D display is similar to parallax barrier technology, so the resolution is still a difficult problem.

Advantages: its lightness won't be influenced with better effects of display.

Disadvantages: related manufacturing is not compatible with existing LCD processes and requires investment in new equipment and production lines.

DHN is a professional laser projector manufacturer and supplier, we commit ourselves to provide advanced video processing technologies, solutions for projection display technology.
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