im sure it will only burn your screen if you have the brightness up all the way. cuz im on the browser for hours and i never seen it happen and my brightness is always all the way down. but a burn would suck.
Well that would be why, most people don't have their brightness so low. Honestly it could never happen, it all depends on the screen itself really.
I am just not willing to take those chances. So I just keep the usage to a minimal unless it's game releted.