Quote from the review at FutureLooks.com:
“The HD931 is a DVD player also has the added ability through a DVI cable to scan the lines of resolution either 720 progressively or 1080 interlaced depending on what the television can handle. So in theory the 720 lines scanned progressively should give you the superior image, as you are looking at 720 lines of an image all at the same time VS the 1080 interlaced you are looking at 540 lines of resolution for the first 1/30 of a second and the second 1/30 of a second you are looking at the other 540 lines of resolution.
So what is the big deal about the HD931 DVD you ask? Depending on your home theater setup the HD931 DVD player becomes a valuable commodity. Let’s have a closer look.”