An active polarisation filter is placed in front of the D-Cinema projector's lens. This filter polarizes the light waves of the stereoscopic subframes in a different way per eye. The lenses of the passive 3D glasses are polarised accordingly so they let only pass the right eye picture or the left eye picture. As a conventional matte white screen would neutralise this polarisation, a silver screen is required.
The light waves of the stereoscopic subframes are polarised differently by a rotating polarisation filter wheel placed in front of the lens. Appropriately polarised 3D glasses complement this system. A conventional matte white screen would neutralise this polarisation, so a silver screen is required.
A rotating filter wheel assembly integrated in the D-Cinema projector slightly shifts the spectral position of the light waves for the RGB primary colours of the right eye and left eye pictures. The filter lenses of the corresponding passive 3D glasses are tuned to the resultant colour shift, so each eye can only perceive one of the two projected 3D subframes.
The D-cinema projector signals a special sync box whether a right eye or a left eye picture is projected at the moment. The sync box controls the active shutter-glasses by infrared communication, dimming their lenses alternately so only one eye at a time can look at the screen. If the picture for the left eye is projected, the right glass becomes opaque, and vice versa.
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