HD Vs. Plasma Television
Plasma TV and HDTV (high definition television) are two distinct, yet overlapping terms. Some, but not all plasma TVs are also HDTVs, which some, but not all high definition televisions use plasma technology.
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Plasma TV
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Plasma TV refers to the particular way the screen is built. It utilizes tiny cells of neon or xenon gas, suspended in plasma to create the signal.
HDTV
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HDTV refers the television's screen resolution. For true HD, the screen needs a resolution of 1080p (1080 horizontal lines of pixels delivered progressively, or all at once); other screens with a lower resolution (720p or 1080i) may claim to be HD, but only 1080p screens are true HD.
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Plasma and HD
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A plasma TV is capable of delivering 1080p resolution, unlike older cathode ray tube TVs. However, some plasma TV screens carry a lower resolution, like 720p or even 480p; since screen resolution can't change, such TVs cannot broadcast in HD.
Digital Tuner
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In addition to needing sufficient screen resolution, a plasma TV also needs a digital tuner, which is capable of reading the digital signals required for high definition. Most plasma TVs come with a built-in digital tuner, but some older models may not.
Other HDTVs
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Along with plasma screen TVs, LCD (liquid crystal display) TVs and projection TVs may also be capable of showing HD images. These TVs use different technology than plasma TVs to render their image, though the resulting screen resolution is still the same.
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References
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