Patent ID: 8361820

Claim:
A manufacturing method of a liquid crystal display device, comprising the steps of: forming a first conductive film; forming an insulating film over the first conductive film; forming a semiconductor film over the insulating film; forming an impurity semiconductor film over the semiconductor film; forming a second conductive film over the impurity semiconductor film; forming a first resist mask over the second conductive film; first etching the insulating film, the semiconductor film, the impurity semiconductor film, and the second conductive film using the first resist mask to expose at least a surface of the first conductive film; second etching a portion of the first conductive film to form a gate electrode layer in such manner that a width of the gate electrode is narrower than a width of the insulating film; etching a portion of the first resist mask to form a second resist mask over the second conductive film; third etching the second conductive film, the impurity semiconductor film, and a part of the semiconductor film using the second resist mask to form source and drain electrode layers, source and drain region layers, and a semiconductor layer; after removing the second resist mask, forming a second insulating film over the source electrode layer, the drain electrode layer, the source region layer, the drain region layer, and the semiconductor layer; forming a color filter over the second insulating film; and forming a pixel electrode layer over the color filter.