Masterimage3D is the company that make passive circular polarized glasses that cost about 65 cents apiece. It works by having a filter sit in front of the lamp of the projector. This filter oscillates 144 times a second switching the image between clockwise circular polarization (for the right eye) and counter-clockwise circular polarization (for the left eye). The passive glasses have filters so that the right eye has clockwise circular polarization, and the left eye has counter-clockwise circular polarization.
they seems to be cheap, i have never tried them though.
how is your experience with them?
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