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| DLP Video Projection Technology |  The DLP (Digital Light Processing) rear-projection television is the most promising successor to the CRT-based rear-projection television. The actual image is demonstrated on a chip, like LCD, however, the chip employed in a DLP projection television is dissimilar. The chip in a DLP projection television is referred to as a DMD (Digital Micromirror Device). Basically, every pixel on a DMD chip is a reflective mirror.
The video image is demonstrated on the DMD chip. The micromirrors on the chip (each micromirror represents one pixel) then tilt very quickly as the image changes. This process creates the grayscale foundation for the image. Then, color is added as light passes through a high-speed color wheel and is reflected off of the micromirrors on the DLP chip as they quickly tilt towards or away from the light source.
The degree of tilt of each micromirror coupled with the quickly spinning color wheel regulates the color structure of the projected image. The amplified light bounces off the micromirrors and moves through the lens, than it is reflected off a large single mirror, and onto the screen.
Benefits of DLP Video Projection
1. DLP projection technology is good not only for projection televisions, made for home use. DLP technology is also employed in some movie theaters for feature film projection. Basically, the films are digitally transformed and saved to either to a hard drive or optical disc, then placed into the DLP projector and demonstrated onto the movie screen. The high resolution DLP chips may render an image that is almost as good as 35 or 70mm film, without all those film scratches.
2. Other benefits of the DLP projection technology contain perfect color accuracy, no "screen door" effect (as with LCD), thanks to its micro-mirror structure, compactness, low power consumption, and high contrast and brightness (although typically not as bright as LCD types but much "smoother" looking). Also, DLP technology is known for its very thin depth cabinet profile, just like LCD rear-projection sets.
Limitations of DLP Video Projection
1. Just as with LCD, each DLP chip has a limited number of pixels.
2. Although a DLP rear-projection television doesn't show the "screen door" effect of many LCD-based units, a DLP rear-projection television can have "the rainbow effect". Essentially, the "rainbow effect" is shown by a brief flash of colors (like a small rainbow) when the viewer quickly looks from side to side on the screen or looks quickly from the screen to side of the room. Fortunately, this does not occur very often and many people do not have sensitivity to this effect at all.
DLP projection has become a real favorite amongst home theater enthusiasts, although it isn't perfect.
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