As such you may or may not accept the thousands of prior answers on this one.
-> Here's my thought on this. Since we live in a litigious world, the makers must protect themselves to the point of absurdity.
It's up to you to figure out what's what and what you accept as truth.
I was reading an owner's manual online for an LG 32" LED HDTV set I'm thinking about buying and it stated do not leave the TV on a channel for too long; more than 2 hours to avoid an image being burned into the TV's screen.
Does that mean if I'm watching The Weather Channel for more than 2 hours or any other channel the screen on the HDTV set can have an image burned into the screen? During bad weather threatening my area I have watched The Weather Channel for more than 2 hours a day straight.