ACTIVE 3D & PASSIVE 3D - Giz 3D Explains 3D Technology (3D Movies Tech)

ACTIVE 3D:
In Active 3D display systems only a single projector is required (with a high refresh rate). The viewer wears special eyewear consisting of two IR-controlled LCD light shutters working in synchronization with the projector. When the projector displays the left eye image, the right eye shutter of the active stereo eyewear is closed, and vice versa. The single projector used must be capable of displaying at a refresh rate to alternate high enough that the viewer does not perceive a flicker between alternate frames.

PASSIVE 3D:
In Passive 3D display systems the viewer wears a pair of glasses containing two oppositely polarized filters -one for the left and one for the right eye. The light from each of two projected images is polarized and can only pass through its corresponding filter.
Projecting 3D (Passive):
With a single projector..
The projector alternates the left eye information with the right eye information at double refresh rate.
A ‘Z-screen’ in front of the projector’s lenses alternates the polarization of the projected image in such a way that the image of each eye will pass through the corresponding polarizing filter of the pair of passive stereo glasses.
With two projectors..
One projector displays the left eye information, the other displays the right eye information, both at standard refresh rate.
A polarizing filter mounted in the optical light path of each projector ensures that the correct information passes though its corresponding filter in the pair of passive stereo glasses.
This two-projector approach has the added value of providing higher brightness.

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