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| Overview |  Though growing numbers of consumers reach into their pockets to buy the Plasma and LCD flat panel televisions, these sets are still out of reach of most average household budgets. As a result, the cheap rear-projection TV is taking center stage in the consumer television market.
The actual term "rear-projection" comes from the fact that the image is projected and reflected onto the screen from behind the screen, unlike conventional video and film projection in which the projector itself is put in front of the screen, such as in a movie theater.
The structure of a rear-projection television consists of five basic elements. First, there is the type of projector technology employed to create a video image. Second, the type of lens assembly employed to magnify the projected image. Third, the necessity to use a mirror to reflect the projected image. Fourth, the screen upon which the reflected image is demonstrated. Fifth, the sealed box that includes all of the previous elements.
Currently, there are three major basic types of projection technology normally used in rear-projection televisions today: CRT, LCD, and DLP. There are also variations of these three types that are not widespread (including D-ILA and LCOS).
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