Patent ID: 7759735

Claim:
A display device comprising: a gate electrode formed over a substrate; an insulating film over the gate electrode; a source electrode formed over the insulating film; a drain electrode formed over the insulating film; a semiconductor film formed to be in contact with the source electrode and the drain electrode along with the insulating film in a curve sandwiched between the source electrode and the drain electrode, wherein the curve is located over the gate electrode by interposing the insulating film therebetween, wherein the source electrode and the drain electrode are extending on a straight line, wherein a portion of the source electrode which overlaps with the gate electrode is substantially symmetric with respect to the straight line, wherein a portion of the drain electrode which overlaps with the gate electrode is substantially symmetric with respect to the straight line, wherein one of each side edges of the source electrode and the drain electrode adjacent to each other with the curve interposed therebetween is curved in a concave, and the other end is curved in a convex, and wherein the source electrode and the drain electrode comprise one selected from the group consisting of silver, gold, copper, an alloy of gold and silver, an alloy of gold and copper, an alloy of silver and copper, or an alloy of gold, silver, and copper.