I thought I had a good understanding of this, until someone posted this comment about the Samsung LN22A450, which claims a 16:9 Aspect Ratio: The 22" has a res of 1680x1050, which is a 16:10 ratio, so 16:9 material will have small letterboxing.
I thought perhaps Samsung was lying about the aspect ratio, but all HDTVs of that size (I checked 5 competitors), also claim 16:9 and 1680x1050. It seems unlikely that the entire industry is lying about the aspect ratio. So what am I not getting here? How can a 1680x1050 pixel resolution be a 16:9 aspect ratio?
1680/1050 = 16:10. The aspect ratio of the monitor or tv is 16:10. When video that has 16:9 aspect ratio is feed to the tv, letterboxing (black bars) will appear at the top and bottom of the screen. Does this help answer your question?