Samsung PL64E8000GFXZP - Manual (Page 216)

Screen Fit mode.
●
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.
●
Scrolling
This function removes after-images on
the screen by illuminating all the pixels
on the PDP according to a pattern.