Patent ID: 7161176

Claim:
A display device comprising: a semiconductor substrate; an insulating layer formed on the semiconductor substrate; a switching transistor and a current controlling transistor formed on the insulating layer, each comprising a source region, a drain region, a gate electrode and a gate insulating film; a first interlayer insulating film over the switching transistor and the current controlling transistor; a source wiring and a drain wiring which are connected with the switching transistor and a source wiring and a drain wiring which are connected with the current controlling transistor, and formed over the first interlayer insulating film; a second interlayer insulating film formed over the source wiring and the drain wiring of the switching transistor and the source wiring and the drain wiring of the current controlling transistor; an electrode electrically connected with one of the source wiring and the drain wiring of the switching transistor, and formed over the second interlayer insulating film; a dielectric layer formed on the electrode; a power supply line electrically connected with one of the source wiring and the drain wiring of the current controlling transistor, and formed on the dielectric layer; a first electrode electrically connected with the other one of the source wiring and the drain wiring of the current controlling transistor; an EL layer formed over the first electrode; and a second electrode formed over the EL layer.