Patent ID: 8772897

Claim:
A thin-film transistor comprising: a semiconductor pattern formed on a substrate; a first conductive layer including a first gate electrode electrically insulated from the semiconductor pattern by a first gate insulation layer; a second conductive layer including a source electrode electrically connected to the semiconductor pattern, a drain electrode spaced apart from the source electrode, and a second gate electrode electrically connected to the first gate electrode, wherein the second gate electrode is electrically insulated from the semiconductor pattern by a second gate insulation layer, and electrically insulated from the source electrode and the drain electrode by a first upper insulation layer, wherein the second conductive layer including the second gate electrode, the source electrode, and the drain electrode are formed of a same layer, and wherein each of the source electrode and the drain electrode is formed directly on respective opposite edge portions of the second gate insulation layer and the semiconductor pattern, and directly on portions of the first gate insulation layer.