The difference lies in how the display lines are scanned. While both resolution standards display 1080 vertical lines, with 1080i the lines are "interlaced" - meaning the odd-numbered lines are painted on the screen first followed by the even-numbered lines. With 1080p, the lines are displayed consecutively in a single pass
, as opposed to the odd-numbered lines alternating with the even-numbered lines.
1080p delivers a picture that's smoother and cleaner. In fact, no HDTV standard surpasses 1080p in terms of picture quality. Furthermore, DIRECTV broadcasts in a 1080p format called 1080p24, which is optimal for movies, to give you a cinematic experience in the comfort of your living room.