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what's the difference between passive polarized glasses and active shutter glasses?
IMAX 3D, RealD 3D, Dolby 3D and XpanD 3D are the most widespread cinema theater technologies for 3D movie projection. All of these, as well as home theaters, utilize 3D glasses to make the eye see only its "own" share of the picture. 3D glasses are variations of two kinds: passive (color or polarized) glasses and active (shutter) glasses. Technically, the older anaglyph red/cyan-plastic-glued-on-white cardboard glasses that everyone has seen are also passive but they are not really used anymore because they can't produce full color images.
Polarized glasses have a different polarizing filter on each eye. Images projected at the screen are also polarized through opposite direction filters for the left and the right eye. When coupled with the 3D glasses, this results in each glass only filtering in the corresponding image even though both are on the screen at the same time.
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