Samsung PN51E490B4F E-Manual page 114

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Scrolling: This function removes after-images on the screen by illuminating all
the pixels on the PDP according to a pattern. Use this function when there are
after images or symbols on the screen, especially when you displayed a still
image on the screen for a long time.
The after-image removal function has to be executed for a long time
N
(approximately 1 hour) to effectively remove after-images on the screen.
If the after-image is not removed after you apply the function, repeat the
function again.
N Press any key on the remote control to cancel this feature.
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Side Gray (Light /
using the Side Gray function can prevent damage to the edges of the screen
by adjusting the white balance on the extreme left and right sides.
Dark): When you watch TV with the screen ratio set to 4:3,
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