all display screens have burn-in problems from old tubes to lcd displays so just turn-off the screen when not in use, preventive maintenance in aircraft cockpit displays. That is considered a user problem then the manufacturer and more screens become u/s after sometime consumer buys new ones.
It is well known that the Samsung Galaxy S suffered screen burn-in on its AMOLED (Super Active-Matrix Organic Light-Emitting Diode) display. The most prominent area to suffer burn-in (or image retention) is the status bar. Early models with older firmware (e.g. Android 2.1) used a grey or white status bar, causing icons such as the clock and battery symbols to be clearly burnt in (and becomes very evident when the phone is showing a full-screen solid colour such as a grey background).
I wonder what TV's (that play a lot of CNN) will look like after a few months with that OLED burn in problem... NO WAY TV makers are going to allow this problem in their brand new, very expensive, showcase OLED TV's!
This is a major problem guys! Forget about PC or laptop monitors. And as long as the big blue problem isn't solved, you can forget about Apple ever using OLED in their devices!!!