Patent ID: 6777763
Filing Date: 2004-08-17
Classification: H01L

Abstract:
A semiconductor device comprising:an active matrix circuit having at least one first thin film transistor formed over a substrate; and a driving circuit having at least one second thin film transistor formed over the substrate for driving said active matrix circuit, each of said first and second thin film transistors comprising: a gate electrode; a gate insulating film adjacent to the gate electrode; and a semiconductor film adjacent to said gate insulating film wherein said semiconductor film includes a channel forming region, a pair of first regions containing an impurity for giving one conductivity type thereto with said channel forming region therebetween, and a pair of second regions in which a concentration of said impurity is smaller than that in said first regions wherein said second regions are interposed between said channel forming region and said pair of first regions, wherein the pair of second regions of said second thin film transistor are overlapped with the gate electrode of said second thin film transistor; wherein a distance between edges of the channel forming region and edges of the pair of first regions of said first thin film transistor is greater than that of said second thin film transistor.