Patent ID: 7923311

Claim:
A method of manufacturing a display device including a thin film transistor, the method comprising the steps of: forming a gate electrode over a glass substrate; forming a gate insulating film comprising silicon nitride over said gate electrode; forming a first semiconductor film comprising amorphous silicon over said gate electrode with said gate insulating film interposed therebetween; forming an N-type semiconductor film on said first semiconductor film; patterning said first and N-type semiconductor films using a first photomask; forming a conductive layer on at least the patterned N-type semiconductor film; etching a portion of said conductive layer to form source and drain electrodes using a resist formed by a second photomask; etching a portion of the patterned N-type semiconductor film to form source and drain regions by dry etching using said resist wherein a channel forming region is formed in said first semiconductor film between said source and drain regions; and forming a passivation film over said glass substrate to cover at least said source and drain electrodes, said channel forming region, a part of a surface of said source region not covered by said source electrode and a part of a surface of said drain region not covered by said drain electrode after removing said resist, wherein each of the source and drain regions has a bottom surface in contact with the first semiconductor film, each of the source and drain electrodes has a bottom surface in contact with corresponding one of the source and drain regions, and a distance between opposed ends of the bottom surfaces of the source and drain electrodes is larger than a distance between opposed ends of the bottom surfaces of the source and drain regions.