Sony VPL-CH375 Quick Reference Manual page 51

Displaying a pattern
You can display a pattern for adjusting the projected image or a grid pattern with the PATTERN
key on the remote commander. Press the PATTERN key again to restore the previous image.
You can use a grid pattern as a guide to write text or to draw lines and shapes on the whiteboard
or blackboard without using a computer.
Note
You cannot use this key when "Type B USB" or "Network" is selected as the input.
Automatically adjusts Phase, Pitch and Shift of projected image while a
signal is input from a computer (APA (Auto Pixel Alignment))
Press the APA key on the remote commander. Press again to cancel adjusting during the setting.
You can also set APA in the Screen Menu. If Smart APA in the Function menu is set to "On",
executes APA automatically when a signal is input.
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Projecting an Image