viewing distance in inches divided by 2.5 = diagonal measurement of screen in inches
Now in your case that means a 72" screen which is, uh... kind of overkill for the bedroom TV I would say :-P Maybe you should consider getting a smaller screen closer to the bed somehow?
But I can tell you its better to err on the larger size rather than the smaller. Even though I was planning on getting a 40" for my living room I am glad I didn't go with anything smaller than a 46" and I only sit 9 feet away from my screen. Now granted this is for a home theater setup.
But i have been in lots of really big rooms where someone has bought a flat screen TV that looked huge when they were 4 feet away from it at the store and then they mount it on a wall way across the room from where they will be sitting and it just looks lost and the effect is totally underwhelming.
It might be a good idea to buy form a local place with a no questions asked 30 day return policy so you can try it out.
I am in the market for an LCD TV for the bedroom. The maximum viewing distance is 15 feet less the headboard and the depth of the wall mounted TV. Does anyone have a rule of thumb for best screen size? The 40" looks really big when I put a template on the wall and wondering if 37 or smaller would be better. I don't want to have the TV overwhelm the room if the viewing distance can accomodate a smaller screen. I have read all the posting and done research on 720p and 1080p and which one I get will depend on the size. I am replacing an old 26" regular TV and have a 65" 1080i in the living room... Any insight would be greatly appreciated. In the store it is hard to gauge the size since it is in such a large space with high ceilings...