Patent ID: 7557377

Claim:
A display device, comprising: a driver circuit containing a buffer circuit, the buffer circuit comprising: a plurality of thin film transistors formed over a substrate; a common gate electrode adjacent to a channel-forming region of each of the plurality of thin film transistors; a common source electrode connected to a source region of each of the plurality of thin film transistors; a common drain electrode connected to a drain region of each of the plurality of thin film transistors, wherein the plurality of thin film transistors are connected in parallel with each other by the common gate electrode, the common source electrode, and the common drain electrode, wherein a ratio of full-width at half magnitude of a Raman spectrum for the channel-forming region of each of the plurality of thin film transistors to full-width at half magnitude of a Raman spectrum for a monocrystalline silicon is 2 or less, wherein the channel-forming region of each of the plurality of thin film transistors contains nickel, wherein the channel-forming region of each of the plurality of thin film transistors is formed separately from each other, and wherein the source region is wider than the channel-forming region in each of the plurality of thin film transistors.