Proj TV\'s
They use high intensity CRT\'s (Cathode Ray Tubes). One for each primary color (Red Green Blue). These crt\'s are coated with phosphor, thats what gives the electrode beam a "mirror" to bounce off of.
Since it is such an intense beam still or static images will diminish the phosphor at that point; the smaller the point the more intense.
In days of old when videogames had minimal graphics consisting of large blocky objects this could be an issue. Now games fill the entire area with vibrant color and detail, so burning is non existant. It\'s like watching TV or movies.
You never want a still picture lingering on the screen EVER, no matter if it\'s a game or a paused movie. It would literally have to be there for HOURS for it to become an issue.
If you must pause your game/movie for more than 10 minutes or so, just turn the TV off (and leave the console/DVD/VCR ON)
I used to repair projection units. Both LCD and CRT types:) Interesting factoid: The Blue burns quickest, then green, then, red.