Sony VPL-VW1000ES Operating Instructions Manual page 56

Blanking
This feature allows you to adjust the displayable region within
the four directions of the screen.
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.
Tip
Depending on the aspect ratio setting, right/left blanking may not be
available.
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