Patent ID: 7635895

Claim:
A display device comprising: an active layer and a gate electrode formed over the active layer with a gate insulating film interposed therebetween, wherein the active layer contains a pair of impurity regions and a lightly doped region which contains an impurity concentration less than that of the pair of impurity regions; a first interlayer insulating film formed over the gate electrode, wherein the first interlayer insulating film contains silicon oxide film and silicon nitride film; a wiring formed over the first interlayer insulating film and electrically connected to one of the pair of impurity regions through a first contact hole formed in the first interlayer insulating film; a second interlayer insulating film formed over the wiring and the first interlayer insulating film; and a pixel electrode formed over the second interlayer insulating film and electrically connected to the wiring through a second contact hole formed in the second interlayer insulating film, wherein a perpendicular line extending from a center of the first contact hole and a perpendicular line extending from a center of the second contact hole are not aligned with each other, wherein the one of the pair of impurity regions is wider than the other one of the pair of impurity regions, and wherein the gate electrode overlaps the lightly doped region.