NEC LT380 - Manual (Page 83)

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6. Using On-Screen Menu
Adjusting Horizontal/Vertical Position [Horizontal/Vertical Position]
Adjusts the image location horizontally and vertically.
Masking Unwanted Area [Blanking]
This feature allows you to mask any unwanted area of the screen image.
Selecting Overscan Percentage [Overscan]
Select overscan percentage (0%, 5% and 10%) for signal.
Projected image
Overscaned by 10%