William- I hope I am none of the above, but I can tell you some of what I know: a letterbox DVD typically was not shot in exactly 16:9, so will not fill entire frame unless it is listed as anamorphic (I think). The 16:9 format is a compromise between typical cinematic and standard TV format. As far as the screen size, I will tell you that my 30" Loewe widescreen, when used in the 4:3 mode has a slightly smaller image size than my 26" Panasonic. My guess it would have to be considerably larger than a 36" 4:3.
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