Patent ID: 6867541

Claim:
An electroluminescence display device comprising, on an insulating substrate, a display region including a plurality of pixels and a group of terminals disposed on an end portion of said substrate for externally connecting the device, wherein each of said plurality of pixels comprises an electroluminescence element, a storage capacitor, a thin film transistor for switching, and a thin film transistor for driving an element; said thin film transistor for switching is connected to a gate line and to a data line; said thin film transistor for switching is connected to a first electrode of said storage capacitor and to a gate of said thin film transistor for driving the element so that a signal corresponding to a data signal supplied from said data line is applied through said thin film transistor for switching to said first electrode of said storage capacitor and to said gate of said thin film transistor for driving the element; said thin film transistor for switching and said thin film transistor for driving the element each has a single gate structure; said electroluminescence element comprises a first electrode and a second electrode and is formed in an upper layer of said thin film transistor for switching and said thin film transistor for driving the element, one of said first electrode and said second electrode being selectively connected to a power source through an active layer of said thin film transistor for driving the element so as to receive an electric current from said power source, said electric current corresponding to a signal applied to a gate of said thin film transistor for driving the element; said second electrode which is formed in an upper layer of said first electrode is connected to a line at a contact portion, said line extending from said group of terminals and composed of the same material as said data line which is connected to a source electrode or to a drain electrode of said thin film transistor for switching; and a contact intermediate layer is provided in said contact portion between said second electrode and of said line, said contact intermediate layer composed of a conductive oxide constituting said first electrode.