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In the world of HD television, there are two basic choices: those that include a digital tuner (HDTVs), and those that use a separate digital tuner (HD monitors). HD monitors and HD televisions offer the highest level of digital TV performance—about five times more picture detail than analogue.
A digital TV will have a much greater resolution than its analogue counterpart. Almost all digital TVs can display progressive-scan DVDs (480p) and HDTV (usually 1080i) at full resolution, whereas analogue cannot. With a digital TV, you’ll enjoy superior picture and sound quality, giving you the best home entertainment experience.
On an analogue TV, the quality of your reception is directly related to the quality of the signal. With digital broadcasting signals, audio and image quality remain consistent, no matter how strong or weak the signal.
Both old and new TV displays are made up of a series of horizontal lines which are in turn, comprised of tiny dots called pixels. The number of these lines and dots makes up what is called "resolution." HDTVs have significantly higher resolution than standard analogue TVs.