If you keep the contrast set low, you will minimize the risk. If the contrast is low, and the game has a reasonable amount of background changes, you should be fine. Otherwise, just don't play for many hours in a row. As long as you are careful, I would not be too worried.
It depends a lot on the game, I think. For example a game like "Mortal Kombat" will have "strength" bars for each combatant, and they are always in the same place no matter what the background is doing. Although the strength varies, the border of the bars doesn't.
So, the border could burn in.
That said, my Sony 46" XBR has seen a lot of game use with no perceptible burn. But, it was carefully adjusted with Video Essentials, and isn't running at the "super-bright" setting profile preferred by most retailers.
(Formerly "ReplayMike", but no longer affiliated with the company; these opinions are mine alone.)
It would be nice if the game manufacturer's themselves, rather the the TV manufacturer's, could incorporate some sort of screen saver feature directly into the games themselves. I'm not sure if this is technically possible, but until someone comes up with a way to provide some sort of screen protection burn-in will remain an issue. Having a direct view set as opposed to a rear projection is a help, and lowering setting is also a big help, but nevertheless burn-in will always be a fear until some type of screen saver is incorporated.
Like you said, it would be nice, but not feasable. Specially for fighting games and any other game that requires a health bar. A screensaver will only help if I PAUSED the game. A lot of tgames will have issues while playing much less pausing. One thing that a lot of games do when u pause them is they DIM. Maybe they do it for the sake of PRTV owners? Its a more common feature then it was a while back.
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