Patent ID: 8673426
Filing Date: 2014-03-18
Classification: G09G,G11C,H01L,H02H,Y10T

Abstract:
1. A method of manufacturing a driver circuit, the method comprising the steps of: forming an oxide semiconductor film over a substrate, a gate insulating film over the oxide semiconductor film, and a gate electrode layer over the oxide semiconductor film and the gate insulating film; forming a film containing a metal element over a first region of the oxide semiconductor film, a second region of the oxide semiconductor film, the gate insulating film, and the gate electrode layer by a sputtering method while heating the substrate; forming a channel formation region in a third region of the oxide semiconductor film, a source region in the first region of the oxide semiconductor film, and a drain region in the second region of the oxide semiconductor film; removing the film containing the metal element by wet etching; forming an insulating film over the oxide semiconductor film, the gate insulating film, and the gate electrode layer; forming a first opening and a second opening in the insulating film; and forming a source electrode layer electrically connected to the source region through the first opening and a drain electrode layer electrically connected to the drain region through the second opening over the insulating film, wherein the channel formation region is interposed between the source region and the drain region and overlaps with the gate electrode layer, wherein the source region and the drain region contain the metal element, and wherein the gate electrode layer is electrically connected to one of the source electrode layer and the drain electrode layer.