Items of material are patterned on a substrate by forming a layer of photoresist on the substrate and a layer of metal on the photoresist. The photoresist is patterned to define an opening exposing a portion of the substrate and the metal is patterned to define an aperture smaller than the opening so...http://www.google.fr/patents/US5641611?utm_source=gb-gplus-shareBrevet US5641611 - Method of fabricating organic LED matrices
