Patent ID: 7554128

Claim:
A cellular phone including a display device, the display device comprising: a semiconductor layer formed over a substrate; a gate electrode adjacent to the semiconductor layer with a gate insulating film interposed therebetween; a first electrode electrically connected to the semiconductor layer, wherein the first electrode comprises a first portion and a second portion, wherein the first portion comprises from bottom to top a part of a first layer, a part of a second layer, a third layer, and a fourth layer, wherein the second portion comprises another part of the first layer and another part of the second layer; an insulator covering the first portion; an organic compound layer formed on and in contact with the another part of the second layer of the second portion and on a side surface of the first portion; and a second electrode formed on the organic compound layer, wherein the first layer comprises titanium, the second layer comprises titanium nitride, the third layer comprises aluminum, and the fourth layer comprises titanium.