Samsung PN51D490A1DXZA - Manual (Page 132)

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English
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The Pixel Shift value may differ depending on the monitor size (inches) and
mode.
N
This function is not available in the Screen Fit mode.
● Auto Protection Time ( Off / 10 min / 20 min / 40 min / 1 hour ): If the screen
remains idle with a still image for a certain period of time defined by the user,
the screen saver is activated to prevent the formation of ghost images on the
screen.
● Scrolling : This function removes after-images on the screen by moving all
the pixels on the PDP according to a pattern. Use this function when there
are remaining after images or symbols on the screen, especially when you
displayed a still image on the screen for a long time.