Organic light emitting diode display and manufacturing method thereof

A display device, comprising:

• a substrate;
• a semiconductor layer disposed on the substrate;
• a gate electrode overlapping the semiconductor layer;
• a voltage line disposed on the substrate and on a same layer as the gate electrode;
• a gate electrode anti-oxidation layer disposed on the gate electrode;
• a voltage line anti-oxidation layer disposed on the voltage line;
• a first insulating layer disposed on the semiconductor layer, the gate electrode, the voltage line, the gate electrode anti-oxidation layer, and the voltage line anti-oxidation layer;
• a source electrode and a drain electrode disposed on the first insulating layer;
• a voltage applying electrode disposed on the first insulating layer;
• a second insulating layer disposed on the source electrode and the drain electrode;
• a pixel electrode disposed on the second insulating layer and connected to the drain electrode;
• a third insulating layer disposed on an edge of the pixel electrode and exposing the pixel electrode;
• an organic emission layer disposed on the exposed pixel electrode;
• and
• a common electrode disposed on the organic emission layer and the third insulating layer,
• wherein:
• the voltage applying electrode is connected to the voltage line through a first contact hole formed in the first insulating layer,
• the first insulating layer is disposed between the voltage line anti-oxidation layer and the voltage applying electrode.