I just had a guest on my site ask me about why he loses some of the image on a TV as opposed to a PC. I explained that it's due to overscan and that the severity of overscan depends on the manufacturer. What I was not able to explain is why overscanning is used because, frankly, I don't know why. I did a search for it on HTF, but the threads that mentioned anything about it simply touched on the fact that overscanning exists and what percentage can be lost due to it. I didn't see anything that definiteively explained why overscanning exists, how it started, and why it continues to be factor. (That doesn't mean it's not there. It just means that I didn't see it. ) Can anyone fill me in on this?