Amorphous silicon thin-film transistors on glass foil are made using exclusively electrophotographic printing for pattern formation, contact hole opening, and device isolation. Toner etch masks are applied by feeding the glass substrate through a laser printer or photocopier, or from laser-printed patterns...http://www.google.de/patents/US6080606?utm_source=gb-gplus-sharePatent US6080606 - Electrophotographic patterning of thin film circuits
