This is a user-contributed article.

TV has evolved in the last 5 years and can be difficult to understand. There are many technologies out there in the marketplace that are worth being conscious of as you go and buy an HDTV. Today's HDTV's also come with a variety of resolutions. You may see 720p, 1080p, 1080i etc. We are going through a changing of the guard, and it's all gotten rather complicated when you want to purchase a replacement set!

The first generation of HDTV's had maximum resolution or lines of 1080i/720p but today's TVs have a maximum resolution of 1080p. When buying a TV you'll find these 1080p sets to be more expensive than those that have a maximum resolution of 1080i/720p. This is because these 'true' HD TV sets are not only newer but they can accommodate optimal resolution on blu-ray and HD-DVD players without having to scale the image. The i/p behind the number indicates whether the resolution is interlaced (an older method of scaling images that results in the image having to be put back together and the signal to degrade) or progressive scan (a newer, superior method that results in no signal degradation).