Acer P1223 - Manual (Page 41)

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3 Set 3D to On.
4 Alternatively, press on your projector’s remote control to open Acer e3D
Management. From the 3D options, select On.
5 If you find that the 3D content is not displaying properly, try selecting 3D Sync
Invert from the projector OSD or Acer e3D Management.