An antiferroelectric liquid crystal device of the present invention includes at least a first antiferroelectric liquid crystal cell and a second antiferroelectric liquid crystal cell, wherein the first and second antiferroelectric liquid crystal cells respectively have an antiferroelectric...http://www.google.de/patents/US5729307?utm_source=gb-gplus-sharePatent US5729307 - Antiferroelectric LCD in which a normal to an antiferroelectric liquid crystal layer is orthogonal to a normal to a second antiferroelectric liquid crystal layer 
