A light-emitting device may include a light-emitting element, a microresonator, and a color filter. The light-emitting element may include first and second electrode and an emissive layer provided between the first and second electrodes, and may emit light of a predetermined color when a voltage is applied...http://www.google.com.au/patents/US7839084?utm_source=gb-gplus-sharePatent US7839084 - Organic EL element and organic EL panel
