Patent ID: 7408196

Claim:
A semiconductor device comprising a functional circuit including: a thin film transistor, wherein said thin film transistor comprises a semiconductor layer, gate insulating film on the semiconductor layer, and a gate wiring on the gate insulating film; an interlayer insulating film so as to cover the thin film transistor; wherein each of a power supply wiring which supplies a power supply voltage to the functional circuit and a ground wiring which supplies a ground voltage to the functional circuit is formed in a grid-like arrangement, wherein at least one of the power supply wiring and ground wiring comprises: a first conductive thin film; two second conductive thin films; a third conductive thin film; a first contact which electrically connects the first conductive thin film and one of the second conductive thin films; second contacts which electrically connect the first conductive thin film and the third conductive thin film via the other one of the second conductive thin films; and a third contact which electrically connects the one of the second conductive thin films and the third conductive thin film, and wherein the functional circuit is a central processing unit.