Acer P1223 - Manual (Page 6)

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If you are viewing Blu-ray 3D content over an HDMI 1.4a or later
connection, this will be set automatically.
6 Press the menu button on the projector remote control to open the OSD.
Select the Image section (second menu option) on the left-hand side of the
window.
7 Set 3D Glasses to Nvidia 3D Vision.