Patent ID: 7202499

Claim:
A semiconductor device comprising: at least a first thin film transistor, a second thin film transistor and a capacitive part formed over a substrate, each of the first thin film transistor and the second thin film transistor comprising: a semiconductor island having a pair of first impurity regions, a channel region between the pair of first impurity regions and a pair of second impurity regions each between the channel region and one of the pair of first impurity regions wherein a concentration of impurity in the pair of second impurity regions is smaller than that in the pair of first impurity regions; a gate insulating film formed over the semiconductor island; a gate electrode formed over the semiconductor island with the gate insulating film interposed therebetween, the gate electrode comprising at least a first conductive layer; and an insulating film formed on and in direct contact with an upper surface of the first conductive layer of the gate electrode, wherein the gate electrode of the second thin film transistor further comprises a second conductive layer over said first conductive layer of the second thin film transistor, wherein said second conductive layer of the second thin film transistor extends beyond side edges of the first conductive layer of the second thin film transistor to overlap said pair of second impurity regions of the second thin film transistor, and wherein the second conductive layer of the second thin film transistor is in contact with the gate insulating film.