Acer P1223 - Manual (Page 12)

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4 If you find that the 3D content is not displaying properly, try selecting 3D
Sync Invert from the projector OSD or Acer eView Management.
5 If this does not improve the image, and you are using an HDMI 1.4
connection, change the 3D Format to match the signal sent by your player.
Note: The 3D Format option is only available for HDMI 1.4 or
above connections. Some older Blu-ray players and most DVD
players use HDMI 1.3 or earlier, please check your player’s
specifications.