Samsung PN51E6500EFXZA - Manual (Page 234)

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Auto Protection Time
If the screen displays a still image for
a certain period of time you define, the
TV activates the screen saver to prevent
the formation of burnt in ghost images
on the screen.
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Scrolling
This function removes after-images on
the screen by illuminating all the pixels
on the screen according to a pattern.
Use this function when there are after