Acer P1223 - Manual (Page 9)

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3 Set 3D Glasses to DLP 3D.
4 Alternatively, press the Empowering Key on your projector’s remote control
to open Acer eView Management. From the 3D options, select DLP 3D.
5 If you find that the 3D content is not displaying properly, try selecting 3D
Sync Invert from the projector OSD or Acer eView Management.