With all the new hype about HD DVD and higher resolution 1080p displays of every variety, it’s a good time to get a clear understanding about what HDTV resolutions are available and what they mean to you as a consumer.
Going back in recent history, the first high definition signal we received was DVD 480i - that is, 480 lines of resolution interlaced. The next widely adopted advancement in DVD that made a big impact on viewing quality was the introduction of 480p or 480 lines of progressive resolution. This resolution matched up with digital video displays (i.e. plasma, LCD flat panels and new rear projection formats such as DLP, and LCD), which all process video signals progressively showing every line of information. The difference is that with 480i, the display is showing every other line of information, with 480p every line of information is shown thus effectively doubling resolution and enhancing viewing quality times 2.
A plasma TV, LCD or other display is now named an EDTV (enhanced definition TV) if it displays a native 480 progressive lines of resolution or usually a total resolution of 853 X480. While not a high enough resolution to display HDTV programming in its intended 1080i or 720p resolution, EDTVs will down convert an HD signal and show it in the displays native pixel resolution. The term “EDTV” was invented to distinguish 480p resolution TVs from their higher resolution and higher priced “HDTV” counterparts. Thus, TVs are not really HDTV or EDTV. Those terms are used for convenience sake to distinguish between TVs that have a static, non-changeable native resolution of lower or higher resolution.
The next big advancement in recent history was high definition programming and displays. HDTV has been a media darling, consumer demand, and FCC mandate (by way of digital broadcast requirements replacing analog). Some HDTV broadcasts are 1080 interlaced lines of resolution or 1080i, and some are 720 progressive lines of resolution or 720p. Which is better is a long debated, matter of opinion and depends somewhat on what type of TV you have and your HD reception.
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