Patent ID: 8129724
Filing Date: 2012-03-06
Classification: H01L

Abstract:
1. A display device comprising: a transparent substrate; and a plurality of thin film transistors which are formed on the transparent substrate, each of the thin film transistors including: a gate electrode which is stacked on the transparent substrate; a source electrode and a drain electrode which are stacked over the gate electrode; a first semiconductor film which is stacked between the gate electrode, and the source electrode and the drain electrode so as to control an electric current which flows between the source electrode and the drain electrode; an insulation film which is stacked on the first semiconductor film in a contacting manner in a state where a source-electrode-side edge portion and a drain-electrode-side edge portion of the first semiconductor film are exposed; and a second semiconductor film and a third semiconductor film which are stacked between the source-electrode-side edge portion and the source electrode as well as between the drain-electrode-side edge portion and the drain electrode, wherein the third semiconductor film is connected with the source electrode and the drain electrode by an ohmic contact, the second semiconductor film is formed below the third semiconductor film with resistance higher than resistance of the third semiconductor film, the second semiconductor film and the third semiconductor film are integrally formed with the source electrode and the drain electrode respectively, the source electrode, and the second semiconductor film and the third semiconductor film which are integrally formed with the source electrode cover a portion of the insulation film and the source-electrode-side edge portion, and the drain electrode, and the second semiconductor film and the third semiconductor film which are integrally formed with the drain electrode cover a portion of the insulation film and the drain-electrode-side edge portion.