sorry no answers before this. To set your mind at rest see this:-
I have used LCD for some time and regularly view DVD film in 16:9 with black bars top and bottom with no ill effects.
When films etc are transmitted in true 16:9 you will always have bars top and bottom. Some TV's will fill the screen by stretching the picture. Some people notice this, some don't. Some dislike it intensely.
There is much written on the subject. However, I would not worry either way. Watch in whichever format you like best. No harm will come to your set. Although there are other factors that will be spoken about by others - in the main do not worry.