TV's create an image by interlacing 2 fields. First field is the odd lines 1-525 and the 2nd field is the even lines 2-524. So what you end up with is half the video being displayed every 60th of a second. Progressive scan elimates the interlacing and reads the full 60 fields per second. You end up with no flicker, less artifacts, and the scan lines are way less visible.
Bottom line you end up with a picture twice as nice.
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