Whoa! Progressive scan DVD players still have scan lines -- but they are output progressively rather than interlaced. Remember interlaced monitors from way back? That's pretty much how (most) TV's operate. The refresh rate is at 60Hz, but it only does every other line. It runs at 30Hz if you count both passes thru for the full picture. This poses the greatest problems in 2 areas (IMHO): 1) In fast action scenes, there is a lot of movement from frame to frame. The interlaced models can blur a bit since the TV is really only painting 1/2 of the picture at a time. 2) Line doublers: if you get a high res TV, it may have a built in doubler, or you can by an external one. This makes the resolution of standard TV or DVD higher by "guessing" what the lines "in between" the other lines are. If you do interlacing, the line doubler has to wait around for about a 30th of a second before it can start "guessing" what the additional lines should be. With progressive scan, the line doubler gets all the info right away, and can start churning out the new lines without delay.
