Depends on what type of TV you have.
If you have a...
- CRT TV (Traditional tube TV)
- CRT rear projection TV (Old bulky HDTV's from a few years back)
- Plasma TV
Your TV can suffer from burn-in, if there is a non-moving image left on screen for too long.
On the other hand, DLP rear projection TV's and LCD TV's do not suffer from screen burn-in.