Patent ID: 6952023

Claim:
A light emitting device comprising: a first wiring; a second wiring; a third wiring; a fourth wiring; a first thin film transistor comprising at least two impurity regions; a second thin film transistor comprising at least two impurity regions; and a light emitting element, wherein each of said first and second thin film transistors comprises a first electrode, a first insulating film over said first electrode, a semiconductor film over said first insulating film, a second insulating film over said semiconductor film, and a second electrode over said second insulating film, wherein said first insulating film is formed so as to cover said first wiring, said third and fourth wirings are formed over said second insulating film, a third insulating film is formed so as to cover said third and fourth wirings, and said second wiring is formed over said third insulating film, wherein said first wiring is connected to said first electrode of said first thin film transistor, and said second wiring is connected to said second electrode of said first thin film transistor, wherein one of two impurity regions of said first thin film transistor is connected to said third wiring, and the other is connected to said first and second electrodes of said second thin film transistor, and wherein one of two impurity regions of said second thin film transistor is connected to said fourth wiring, and the other is connected to a pixel electrode.