On this set, and I am sure other manufacturers offer something similar, there is your standard pixel orbiter and a pixel "wash" function to combat burn in.i thought manufactures have taken care of that!!!
It also has a function to where if you pause the screen, after a few minutes it dims it by over half. Then after another set amount of time, maybe another 3 minutes, if you havent resumed watching, it puts the screen into a sleep mode. A simple button push (any button) puts you right back at the pause screen.
It would be pretty hard to generate burn in with your typical use IMO. At least with this particular set.