XpanD 3D System
The XpanD system uses active shutter glasses that alternately open and close the view for each eye. This very rapid flashing is synchronized with the screen, which alternately flashes the correct view for each eye.
The glasses are quite expensive—more than dolby's filter glasses and much more than simple polarized glasses. XpanD glasses required batteries and include electronic circuitry which can fail (unlike passive glasses that have no electronics).
|Matte White (no special screen is required).
|Active-shutter. Expensive, multi-use.