HDTV > How does it work?
Resolution
Resolution is displayed on-screen by horizontal and vertical pixels that make up the on-screen image. The number of pixels determines the resolution, and the best resolution on a digital television is available with an HDTV set. For example, lines of resolution you see on older, analog television sets are 705 (width) x 485 (height), at best. In comparison, HDTV offers screen resolutions of 1280 (width) x 720 (height) or 1920 (width) x 1080 (height).
HDTV resolution is available in two formats: 720p and 1080i. The "p" and "i" refer to the scan methods, or how the lines of resolution are delivered on-screen. Progressive "p" scanning means that pixels on the screen are refreshed simultaneously. Interlaced "i" scanning refreshes pixels in alternations, first the odd lines, then the even lines. In order to display the HD, you need to have a 720p or 1080i signal coming into your TV, and an HDTV set capable of displaying a resolution of 1280 x 720 or higher.
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