Patent ID: 8227806

Claim:
A semiconductor device comprising: a pixel TFT and a capacitor disposed in a pixel section over a substrate; and a driver circuit comprising a p-channel TFT and an n-channel TFT, over the substrate; a first interlayer insulating film comprising an inorganic insulating material over a gate electrode of the pixel TFT; a second interlayer insulating film comprising an organic insulating material over the first interlayer insulating film; and a pixel electrode having a light reflective surface over the second interlayer insulating film, and electrically connected with the pixel TFT through an opening in the first and second interlayer insulating films, wherein the p-channel TFT of the driver circuit comprises a channel forming region, a source region and a drain region in contact with the channel forming region, and a gate electrode over the channel forming region, wherein an edge of the source region of the p-channel TFT in contact with the channel forming region is aligned with an edge of the gate electrode, and an edge of the drain region of the p-channel TFT in contact with the channel forming region is aligned with another edge of the gate electrode, wherein the n-channel TFT of the driver circuit comprises a channel forming region, a first n-type impurity region of a first concentration which forms at least one LDD region in contact with the channel forming region and partly overlapping a gate electrode, and a source region and a drain region in contact with the at least one LDD region, wherein the pixel TFT comprises a channel forming region, a second n-type impurity region which forms at least one LDD region in contact with the channel forming region, and a source region and a drain region in contact with the at least one LDD region, wherein the capacitor comprises a third n-type impurity region of the first concentration, and wherein the first n-type impurity region and the third n-type impurity region exist in a same semiconductor layer.