An optoelectronic active circuit element is created by the combination of a light source, an optical control filter and a photocell intimately coupled together. The light source has at least one light emitting surface emitting light energy of a specified frequency bandwidth and the photocell has at least...http://www.google.de/patents/US5510665?utm_source=gb-gplus-sharePatent US5510665 - Optoelectronic active circuit element
