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The inside of the front of a CRT is coated with a phosphor which reacts to light. The gun at the back of the tube projects a picture onto the phosphor and the image is displayed. If this image is left on for an extended period, the areas where the phosphor is lit by the beam will become burned by the beam.
LCD's use a liquid sandwiched between two layers of glass. When electricity is applied to part of the liquid, it changes to a darker color. This is physically different from a CRT, so no burn can occur.
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Sony Trinitron Fan
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