Liquid Crystal Display. A screen for displaying text and graphics based on liquid crystal technology, where minute currents change the transparency of the screen. The advantages of LCD screens are very low power consumption (can easily be battery driven) and the low price of mass-produced units. The LCD system first became wide spread in digital wristwatches which can operate for a very long time on small batteries. The disadvantages of LCD were narrow-viewing angles, slow response (the first ones were too slow to be used for video), invisibility in the dark unless the display is backlit, and difficulties in displaying true colors on color LCD displays. With the introduction of new technology and especially TFT driven LCD displays, picture quality began resembling the quality of a CRT (the Cathode Ray Tube used in televisions and monitors). Brightness has improved dramatically and the price is dropping constantly. New large active LCD (TFT driven) displays are replacing TV tubes, but are still quite pricy. When the prices of large LCD screens start approaching the prices of CRTs, they will inevitably replace most home TV sets, and will provide, at a reasonable cost, a TV which can be hung on the wall like a picture.
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