NEC NP3151W - Manual (Page 98)

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6. Using On-Screen Menu
Adjusting horizontal/Vertical position [hORIZONTAL pOSITION/VERTICAL pOSITION]
Adjusts the image location horizontally and vertically.
Selecting Overscan percentage [OVERSCAN]
Select overscan percentage (0%, 5% and 10%) for signal.
Projected image
Overscaned by 10%
NOTE: When [NATIVE] is selected in [RESOLUTION], [OVERSCAN] is not available.