[quote user="Maccca"]Pioneer has an 'Orbiter' function to helps prevent screen burn by shifting pixels[/quote]
It kind of works by shifting the whole picture to the side, waiting a while, shifting it up, waiting a while, shifting it the other way, waiting a while, then shifting it down to where it was in the first place.
Sounds alarming, but since it only moves one pixel at a time, you don't even see it happening, and it reduces the chance of significant blocks of pixels being continuously illuminated, which is what can cause screen burn on some sets.
Other manufacturers use similar strategies - my old Fujitsu does it, too, and also has a whitescreen facility to light up the whole screen for a period of time, which is another way of erasing any image retention.