Patent ID: 7473968

Claim:
A semiconductor device including a thin film transistor and a storage capacitor, the semiconductor device comprising: a semiconductor layer formed on an insulating surface; an insulating layer formed over the semiconductor layer; a gate electrode of the thin film transistor formed over a channel forming region of the semiconductor layer with a first portion of the insulating layer interposed therebetween; an interlayer insulating film formed over the gate electrode; a pixel electrode formed over the interlayer insulating film and electrically connected to a drain region of the semiconductor layer; and an upper electrode of the storage capacitor formed over a lower electrode of the storage capacitor with a second portion of the insulating layer interposed therebetween, the lower electrode of the storage capacitor being made of a portion of the semiconductor layer wherein the interlayer insulating film is formed over the upper electrode of the storage capacitor, wherein the storage capacitor is electrically connected to the drain region, and wherein the first portion of the insulating layer is thicker than the second portion of the insulating layer.