Patent ID: 7317206

Claim:
A flat panel display, comprising a plurality of sub-pixels driven by thin film transistors, each of the thin film transistors including a source electrode, a drain electrode, a gate electrode, and a polysilicon semiconductor layer and each of the sub-pixels including a first electrode, a second electrode, and an emitting layer disposed between the first electrode and the second electrode, wherein one of the source electrode and the drain electrode includes: a first titanium layer contacting the semiconductor layer; an aluminum-based metal layer arranged on the first titanium layer; a second titanium layer arranged on the aluminum-based metal layer and contacting the first electrode; a first titanium nitride layer disposed between the first titanium layer and the aluminum-based metal layer, the first titanium nitride layer preventing titanium from the first titanium layer and aluminum from the aluminum-based metal layer reacting with each other; and a second titanium nitride layer disposed between the second titanium layer and the aluminum-based metal layer, the second titanium nitride layer preventing titanium from the second titanium layer and aluminum from the aluminum-based metal layer reacting with each other; wherein the titanium nitride layers contain 5 to 85 wt % of nitrogen.