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Similar to any other TV, a LCOS projection TV  picks up a signal and translates it into sounds and images.  Typically, this signal comes from a cable company, a satellite dish, or your DVD player.  Not so long ago, the only TV screens that you could buy utilized a cathode ray tube (CRT) to build up a series of  lines that created an image.  Typically, LCOS displays light up pixels instead.  This is very similar to the way that your LCD computer  monitor works.  In some cases, you might even be able to purchase an extension card that will enable you to use your PC monitor to accept TV signals.  As may be expected, you can purchase TV's that come in a wide range of sizes and image resolution capacities.