what is the difference between 1080 i and 1080 p??

Progressive scan is always preferred over interlaced because interlacing introduces "artifacts" into the picture. If the picture does not change from field to field (a stationary picture of a stationary object), then there is no difference between "i" and "p". But when objects move, the two fields of the interlaced picture will not be the same causing the edges of moving objects to break up into jagged lines (the moving edges only show 540 lines).

All fixed-pixel tvs (except for one plasma model) display progressive scan images. They are all "p": either 1080p or 720p, 768p, whatever number of lines the display screen has. However, much HDTV is broadcast as 1080i. The tv will convert the interlaced picture to a "p" picture by filling in the extra lines for each field. How well that is done determines how good the TV will display moving objects, and some sets are better than others in this regard. The first guy is right on some accounts but mistaken on others. 1080i is actually refreshed more often that 1080p. In fact, twice as fast at 60 times per second which 1080p is refreshed at 30 frames per second.

1080p isn't all that useful as of right now as all broadcasted channels are in either 720p or 1080p. The only technologies capable of taking advantage of 1080p is some high definition titles and some games on the PS3.

The difference between 1080p and 720p or 1080i seems large on paper but the average person will not be able to tell much of a difference between the two, especially at normal viewing distances.

CRT is short for Cathode ray tube and it is still a great technology. Producing the darkest blacks currently available on any TV technology and great colors. The only downside is size(both screen and the size of the box) and weight(can easily exceed 100 pounds)

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