I think it has more to do with the movie companies being too lazy to reformat the movie to fit a regular TV. So they put huge black bars there instead. If you have an HDTV you can probably turn the picture mode to "zoom" in the options menu and it will help make the picture larger. It annoys me too, but the zoom mode usually fixes that.
:lmao: - you could not be further from the truth.
the complete image of the film is whatever aspect ratio it was filmed in....for cinemas.
if you watch the pan and scan 4:3 version (which every film distribution company already makes in order to sell the film to countries where that is the only format for television), then you are missing not only the sides of the image (very different visual experience from what the director intended, for example, sometimes if there are two people in the frame, the pan&scan must focus on only one person, etc.), but with a 1920x1080 video master you get over 2 million pixels for each frame, vs. 314,000 pixels for a 648x486 NTSC video master, for example.
99% of feature films are shot either in 2.35:1 or 1.85:1 aspect ratiio. 1.85:1 is pretty close to 16x9 format televisions (which are 1.78:1), so you still lose a little bit of the visual image, but not much, when the video master is formatted for 16x9.
If studios butchered blu-ray versions of 2.35:1 films by cutting out the visual image to force them to fit 16x9, there would be an uproar and such a blu-ray would get horrible reviews. The only sensible option is to release those films letterboxed, so that people with 16x9 displays can still see all of the visual image from the film. 2.35:1 can only be viewed in its full glory if you have an anamorphic lens for your HD projector, in which case it looks gorgeous.