Patent ID: 8124980

Claim:
A display device, comprising: a display panel having a plurality of sub pixels on a substrate thereof; and a drive circuit which is configured to drive the plurality of sub pixels, the drive circuit having a thin film transistor formed on the substrate, and the thin film transistor having a semiconductor layer made of poly-silicon, wherein the thin film transistor includes: a source electrode, a semiconductor layer and a drain electrode which are formed on the substrate; a gate insulation film which is formed on the source electrode, the semiconductor layer and the drain electrode; a gate electrode which is formed on the gate insulation film and above the semiconductor layer; an insulation film which is formed on the gate electrode; and a gate line layer which is formed on the gate insulation film wherein the insulation film is formed on an entire region where the gate electrode and the semiconductor layer overlap each other, the gate line layer covers at least a portion of the entire region via the insulation film, the gate line layer is connected with the gate electrode via a contact hole, and the contact hole is formed in a region which is different from the entire region, wherein the gate line layer is an aluminum layer.