I own an OPPO BDP-93 and have owned earlier OPPO players. I love OPPO. I think what they have written in their promotional material is the kind of thing that many manufacturers do, and I think it's confusing.
DVD Up-Conversion - Per-pixel motion-adaptive de-interlacing and advanced scaling transform the standard definition image on DVDs to high definition output on your TV. Additional Qdeo video processing options help to deliver a clearer, smoother, and more true-to-life picture free of noise and artifacts.
The terms (bold face) are correct, but I think they intentionally leave room for folks to assume more than is possible with words like "transform". To display a 480i (DVD) image on a 1080p fixed resolution screen, you have to map a small amount of data into an array about four times larger. While the result is in a HD 1080p format it still doesn't have HD 1080p detail because that detail was lost during the transfer from film to DVD.
While all 1080p displays can handle the required "up-conversion", almost none of them can do it as well as the better (name brands starting around $100) Blu-ray players, HD-DVD (one model mainly) players, or dedicated video processors. The value of improved "up-conversion" increases as the screen size increase. Cable and satellite boxes are probably worse than TVs. If you can deliver 1080i and 1080p to your display, that's probably the best that you can do at this time.
Imagine what a poorly transfered 480i DVD movie looks like going through the $25,000 Sony 4K projector onto a 128" screen? It's been deinterlaced from 480i to 480p, and then scaled to 2160P. That's a lot of empty spaces to fill in.