What Makes an HDTV High Definition?

You keep hearing about it new high definition DVDs, high definition camcorders, and high definition TVs. And you probably know that high definition means higher quality video, but beyond that it may all be just a bit fuzzy.

If youre a TV and you want to be labeled as an HDTV, then you need to have one of three formats 720p, 1080i, or 1080p, with 1080p being the best of the three. The main difference in these formats is resolution. A 720p TV will have a resolution or 1280 pixels by 720 lines. A 1080i or 1080p will have a resolution of 1920 pixels by 1080 lines.

The other factor is the letter behind the number, p and i. They refer to the way the image is built up. The p stands for progressive and the i stands for interlaced. When using an interlaced scan, only half the lines (for a 1080i, thats 540 lines) are displayed at a time. The lines are alternated so fast (1/30th of a second) that your eyes interpret the two images to be just one. In progressive, all of the lines are displayed at the same time, which provides a smoother looking picture. (Lines are displayed every 1/60th of a second).

Now in a perfect world, wed all have 103 1080p plasma displays in our living rooms, however, unfortunately we dont live in a perfect world, so we have to figure out which HDTV, if any, best suits our needs.

The first question to be asking yourself is what am I going to use it for? Do you watch a lot of movies? Do you plan on getting HD channels from your cable or satellite provider? Are you willing to upgrade the rest of you A/V equipment? These are important questions because if you dont plan on upgrading to a new DVD player (HD-DVD or Blu-ray), and you dont want to spend the extra money on an HD box from your cable or satellite provider, then an HDTV probably isnt for you. You can go buy a nice big screen TV and save yourself several thousand dollars in the process and still just as nice a picture from your standard television programming and standard DVDs as you would with a high definition display.

For those of you who do plan on upgrading the rest of your equipment, then an HDTV may be an investment youll want to consider.

Gary Ruplinger is a writer for PlasmaGeeks.com. Be sure to visit his site to learn more about Plasma TVs and HDTVs.

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