Monocular and stereoscopic color display systems, wherein passive cholesteric liquid crystal (LC) filter/mirrors and active variable retarder type LC arrays are used in combination to produce low cost, high resolution, multicolor and full color displays, suitable for use as advertising,...http://www.google.com/patents/US5835166?utm_source=gb-gplus-sharePatent US5835166 - Chiral nematic liquid crystal polarization modulated color display for stereoscopic viewing device 
