Pixels for a large video display which employs solid-state emitters, such as colored light emitting diodes, as light source are formed by outfitting each colored solid state emitter within the pixel with an individually tailored miniature intensity-enhancing optical system. Each of these miniature optical...http://www.google.de/patents/US6603243?utm_source=gb-gplus-sharePatent US6603243 - LED light source with field-of-view-controlling optics
