Samsung SyncMaster 400UXN-3 User Manual page 116

You can change the Safety Screen Type.
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Period
Use this function to set the execution period for each mode set in the timer.
Time
Within the set period of time specify a time for execution.
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Bar
This function prevents after-images on the screen by moving long black and white vertical
lines.
Eraser
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Adjusting the LCD Display
Bar
Eraser
Pixel
Mode - Bar, Eraser, Pixel : 10~50 sec