Patent ID: 7122835
Filing Date: 2006-10-17
Classification: G02F,H01L

Abstract:
1. A display device comprising a pixel portion and a driver circuit portion on a substrate, said pixel portion comprising: a semiconductor film comprising a plurality of channel forming regions, a plurality of impurity regions, a source region, and a drain region; a gate electrode overlapping with the plurality of channel forming regions and some of the plurality of impurity regions, with a gate insulating film interposed therebetween; a gate wiring electrically connected to said gate electrode; a source wiring electrically connected to one of said source region and said drain region; and; a pixel electrode over said source wiring, wherein said some of the plurality of impurity regions are located between the plurality of channel forming regions in the semiconductor film and contain a low concentration impurity region and a high concentration impurity region wherein a thickness of a gate insulating film of a TFT in said driver circuit portion is thinner than that of the gate insulating film of a TFT in the pixel portion, and wherein a first portion of said source wiring overlapped with said gate wiring has smaller line width than a second portion of said source wiring not overlapped with said gate electrode wiring, and a portion of said second portion overlaps with said pixel electrode.