Acer P7505 - Manual (Page 9)

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English
3 Set 3D to On.
4 Alternatively, press the Empowering Key on your projector’s remote control
to open Acer e3D Management. From the 3D options, select On.
5 "3D Format" shows while no enough info, please choose suitable one for
correct 3D displaying.
Note:
1. The "3D Format" is only available for HDMI 1.4 or 2nd
generation 3D projectors.
2. The "Frame Packing" is only existed at HDMI 1.4 or later input.