A cholesteric liquid crystal layer which is inhibited from appearing to be colored when viewed from slant directions and thus has excellent viewing angle characteristics, while enabling an improvement in the brightness of liquid crystal displays, etc.; and an optical element and an lighting device with...http://www.google.de/patents/US6088079?utm_source=gb-gplus-sharePatent US6088079 - Cholesteric liquid crystal layer, optical element, lighting device, and liquid crystal display
