An object of the invention is to provide a technique for improving the characteristics of a TFT and realizing an optimum structure of the TFT for the driving conditions of a pixel section and a driving circuit by a small number of photo masks. Therefore, a light emitting device has a semiconductor film,...http://www.google.es/patents/US7265390?utm_source=gb-gplus-sharePatente US7265390 - Light emitting device
