Generally speaking because of their technology and the way they work, LCD's do not suffer from "burn in" in the way you mean it. They call it "image persistance" in LCD's and it is extremely rare and difficult to have happen. If it does you are told to either leave your monitor/tv off for a couple of days and this will reset the image crystals, or to display a bright white image on for a day or so and this is supposed to reset the crystals. Either way I wouldn't worry to much about it happening.
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