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Well assuming it's an LCD screen that has a section of black for long periods of time... remember that the actual liquid crystal in the black region will be absorbing all that white backlight light, and will thus get very hot - degrading the liquid crystal over time. Even if this doesn't happen, you have to remember that the opposite is also true. The rest of the screen that isn't black is being used constantly and the black sections are not. So the rest of the screen's liquid crystal will likely wear out and the color will fade. You might not notice until you have a fullscreen picture again, at which point the normally black areas will likely have a better color quality than the rest of the picture. (This would probably also be a much bigger issue with an OLED screen.) So yeah, in theory, it can suffer in those ways. A plasma tv would also suffer similarly, but for different reasons. And I think most people say that plasmas are more prone to burn-in anyway.
All that having been said, I really wouldn't worry about it much if your tv is just under normal home tv usage. By the time any sort of burn-in occurs, the tv will be old and broken anyway.
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