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The folks at Sound and Vision magazine have a primer on How to Buy an HDTV. Here's a segment from their article that discusses the resolution, "A digital TV's vertical resolution is given as the number of horizontal scan lines, or rows of pixels, from top to bottom of the screen. Its horizontal resolution is the maximum number of discernible vertical lines, or columns of pixels, from left to right across a screen width equal to the height of the picture. (This keeps widescreen sets from having higher resolution than sets with the squarer 4:3 aspect ratio simply because of their shape.)

One of the two commonly used high-def signal formats is 720p (progressive-scan), which has 720 lines of vertical resolution. There are 1,280 dots, or pixels, in each widescreen line, giving it a horizontal resolution of 720 pixels when the width is limited to the height. The other is 1080i (interlaced), which has 1,080 lines with 1,920 pixels per widescreen line, or 1,080 pixels horizontally when similarly limited. By contrast, traditional 480i TV signals have 480 lines of vertical resolution and up to 720 pixels per line, for a maximum horizontal resolution of 540 lines.

It would be nice if all HDTVs had resolutions of 1080i or 720p, but unfortunately the specs can vary a lot — especially among two kinds of fixed-pixel displays, plasma and LCD. Some screens might match up perfectly with one of the high-def formats, but many have native resolutions like 1,024 x 1,024 pixels, so the TVs convert incoming video to match. These models are still considered HDTVs, which have come to be defined as any sets that can display at least 720 lines of vertical resolution."

However, 1080i and 720p have been surpassed by 1080p. Sounds confusing, I know, but here's some more current info on 1080p, from CNET.com, "Another format is also becoming more well-known: 1080p, which combines the superior resolution of 1080i with the progressive-scan smoothness of 720p. True 1080p content is extremely scarce however, and none of the major networks have announced 1080p broadcasts."

If you're looking for the best of the best, you might look to pay a little more for the 1080p set - that way, when the networks and cable or satellite providers catch up... you'll be ready!

If you'd like to talk to a professional home theater installer about putting together the right package for your home - you can post your request with Construction Deal. It's a fast, free and easy way to find a quality installation pro to make sure you get your moneys worth!

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Labels: HDTV, HDTV Specs, plasma tv