OP, this thread:
http://forum.blu-ray.com/showthread.php?t=9502 includes a long list of movies shot 16:9. Check some of these and see if they fill your screen edge-to-edge, top-to-bottom. If not, I suspect you have a TV zoom mode setting in something other than "full" (or similar), though I can't think of a TV zoom mode (zoom out?) that would squeeze 16:9 content down to add the black bars at the top & bottom without adding them on the left & right.
I can assure you that the new

TV3 "fills" the screen edge-to-edge, top-to-bottom on a 16:9 HDTV.
Are you perhaps using a 4:3 HDTV (which certainly would make a 16:9 video have black bars above & below the movie) while making 4:3 TV shows completely fill that screen? 4:3 HDTVs were still selling pretty well up to about 4-5 years ago.
Are you perhaps ripping your own movie content with a custom preset in which you've accidentally forced the vertical compression to create the black bars above & below on 16:9 video? Do movies you think are definitely 16:9 looked squashed (people look fat, faces look fat, etc)?
As others have implied, I suspect you are thinking certain movies are 16:9 when, in fact, they are wider aspect ratio movies. These should add the black bars so you can see the entire picture as intended. To help figure out the problem, you need to identify a few movies that are definitely 16:9 and try them. If they still add the black bars, you've got a setup problem outside of the

TV3.
Do you run the connection directly from the

TV3 to your HDTV or do you flow it through something else like a receiver? if the latter, does it have any zoom settings (and you might want to eliminate this possibility by temporarily connecting the

TV3 directly to your HDTV... and then trying some movies for which you are certain about 16:9 aspect ratio)?