Cheap projector tips
There are two main type of video projector: LCD and DLP projector.
LCD (Liquid Crystal Display) projector using LCD light gates. This is the simplest system, making it one of the most common and affordable for home theaters and business use. Its most common problem is a visible "screen door" or pixelation effect, although recent advances have minimized this.
DLP (Digital Light Processing) Projector using one, two, or three microfabricated light valves called a digital micromirror device (DMDs). The single- and double-DMD versions use rotating color wheels in time with the mirror refreshes to modulate color. The most common problem with the single- or two-DMD varieties is a visible "rainbow" which some people perceive when moving their eyes. Systems with 3 DMDs never have this problem. More recent projectors with higher speed (2x or 4x) and otherwise optimised color wheels have minimized this artifact.
Source: wikipedia
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