Patent ID: 7259427

Claim:
An electroluminescence display device comprising: a first thin film transistor for controlling current formed over a substrate; and a second thin film transistor for switching formed over the substrate; wherein the first thin film transistor comprises: a semiconductor layer comprising a channel region, a first impurity region in contact with the first channel region, and a second impurity region in contact with the first impurity region; a gate insulating film formed over the semiconductor layer; a gate electrode having a first conductive layer in contact with the gate insulating film, and a second conductive layer in contact with top and side surfaces of the first conductive layer and the gate insulating film; a pixel electrode electrically connected to the second impurity region; and a light emitting layer formed over the pixel electrode, wherein the first impurity region is disposed so as to completely overlaps with the second conductive layer with the gate insulating film interposed therebetween, wherein the second impurity region is disposed so as not to overlap with the second conductive layer with the gate insulating film interposed therebetween.