Patent ID: 7214986
Filing Date: 2007-05-08
Classification: G02F,H01L

Abstract:
1. A semiconductor device comprising a thin film transistor, the thin film transistor comprising: a semiconductor layer formed on an insulating surface; an insulating film formed on the semiconductor layer; and a first gate electrode and a second gate electrode which are formed on the insulating film, wherein the semiconductor layer comprises: a first channel forming region overlapped with the first gate electrode through the insulating film interposed therebetween; a second channel forming region overlapped with the second gate electrode through the insulating film interposed therebetween; a high concentration impurity region located in contact with both the first channel forming region and the second channel forming region; a first low concentration impurity region located in contact with the first channel forming region; a drain region located in contact with the first low concentration impurity region; a second low concentration impurity region located in contact with the second channel forming region; and a source region located in contact with the second low concentration impurity region, and wherein an interval between the first gate electrode and the second gate electrode is shorter than a width of the first low concentration impurity region.