Patent ID: 6872604

Claim:
A method of fabricating a light emitting device, comprising the steps of: forming a semiconductor film on an insulator; forming a gate insulating film covering the semiconductor film; forming a first conductive film and a second conductive film on the gate insulating film; forming an electrode made of the second conductive film by etching the second conductive film; adding an n-type impurity element to the semiconductor film by self-alignment using the electrode made of the second conductive film as a mask; forming an electrode made of the first conductive film by etching the first conductive film by self-alignment using the electrode made of the second conductive film as a mask after forming the electrode made of the second conductive film; forming a second gate electrode by narrowing a line width of the electrode made of the second conductive film by etching; adding an n-type impurity element to the semiconductor film by self-alignment using the second gate electrode as a mask; and forming a first gate electrode by narrowing a line width of the electrode made of the first conductive film by etching.