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LCD Projectors
Types of Technologies
While most projectors are grouped under the umbrella name 'LCD Projector,' there are actually three different light technologies which enable a machine to project a computer image onto a screen. Though not substantial, the differences among these technologies are important to recognize when comparing similarly priced models.

Single Panel TFT (Thin Film Transistor) LCD
These LCD projectors operate by shining light through a transparent panel of LCD cells. Tiny transistors control each LCD cell, changing their polarity to produce the appropriate color. Together, these LCD cells combine to display the desired image.

Since single panel LCDs are relatively easy to produce, models that use this technology tend to be on the cheaper side. As is usually the case, though, a less expensive single panel LCD projector will have a lower color quality than its more expensive counterparts.

Polysilicon LCD
Polysilicon LCD displays share the same basic underlying technology as single panel LCDs, but differ in one respect: instead of one panel, there are three layers. With this type of LCD, there are three separate primary color panels (red, green, and blue) that are used to produce the desired color. One of the key advantages of this design is that it tends to produce more highly-saturated colors that the other technologies. At the same time, if you're interested in projecting the brightest image possible, or will be using video extensively in your presentations, a projector with DLP technology will be more suited to your needs.

DLP (Digital Light Processing)
Developed by Texas Instruments in mid-1996, DLP models project images by reflecting light against hundreds of tiny mirrors known as digital micromirror devices (DMD). Each mirror, representing one pixel, is individually powered by electronics that adjust the angle of the mirror according to the color being displayed. In general, DLP projectors tend to offer brighter and more continuous images than their LCD projector counterparts. That, along with the fact they're leading the weight loss trend in the projector market, makes them very appealing for presentations. DLP projectors also handle video images extremely well. On the down side, on the average they're more expensive and may produce a softer image than a sharp three panel LCD.

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