Sony VPL-HW65 Operating Instructions Manual page 28

Setting items
Blanking
Description
This feature allows you to adjust the displayable region within the four
directions of the screen.
On: Select the edge to adjust by highlighting Left, Right, Top, or Bottom
using the M/m buttons.
Adjust the amount of blanking using the </, buttons.
Off: Turns off the Blanking function.
Tip
Depending on the aspect ratio setting, right/left blanking may not be
available.
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