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Traditional cathode ray tube (CRT) displays utilize a vacuum tube in which images are produced by scanning an electron beam horizontally and vertically across a layer of phosphors inside the picture tube. When “excited” by the passing electron beam, the phosphor pattern will “glow” temporarily through an aperture grille or mask, producing individual pixels. CRT HDTVs have a wide viewing angle and fast video-response performance, however, they are generally not as bright as other types of displays, and CRT based equipment tends to be very bulky (at least 2 feet deep for a 40” screen) and heavy (averaging 300 pounds for a 40” screen). According to a May 2004 technology white paper released by Dell Computer, CRT technology is gradually being replaced by flat-panel monitors for PCs, and CRT-based HDTVs are being replaced by thinner and more compact HDTVs.
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Overview of High-Definition TV Technologies
