A phase spatial light modulator composed of a liquid crystal cell having molecular orientation recorded during the fabrication process as a direct result of a photochemical reaction exerted upon the liquid crystal material, a mechanically-induced change of a liquid crystal alignment layer,...http://www.google.com.au/patents/US5784141?utm_source=gb-gplus-sharePatent US5784141 - Bi-stable non-pixellated phase spatial light modulator for enhanced display resolution and method of fabrication 
