For years I noticed on a 4:3 set that the DVD image for less-than-full screen movies, sloped slightly from left to right, at least along the top edge. The decline amounts to almost 1/2" on the 27" set I always wondered if might have been the TV tube of that particular Sony 27" set itself. But now I'm seeing the same thing on a smaller TV set, so wonder if there is any generic explanation for this phenom. Hope I'm not in the wrong room, or asking a question that's been asked many times before. TIA!