Patent ID: 7330168

Claim:
An electroluminescent display device having a plurality of pixel portions, each of the pixel portions comprising: an electroluminescent element; a driving transistor driving the electroluminescent element; a drain signal line; a pixel selecting transistor supplying a signal from the drain signal line to a gate of the driving transistor; and a storage capacitance element holding the signal supplied to the gate of the driving transistor, the storage capacitance element including an extension of a source of the pixel selecting transistor as a first capacitance electrode layer, a second capacitance electrode layer disposed above the extension of the source, an insulating film disposed on the second capacitance electrode layer and a third capacitance electrode layer connected to the source and disposed on the insulating layer, wherein the drain signal line and the third capacitance electrode layer lie in the same plane as a top plane of the insulating film.