Organic light emitting diode display and manufacturing method thereof

An organic light emitting diode display comprising:

• a substrate;
• a semiconductor layer on the substrate;
• a gate insulating layer covering the semiconductor layer;
• a gate electrode formed in the gate insulating layer, the gate electrode overlapping the semiconductor layer;
• a pixel electrode formed in a pixel area, the pixel electrode over the gate insulating layer;
• an interlayer insulating layer covering the gate electrode and the gate insulating layer, the interlayer insulating layer exposing the pixel electrode through a pixel opening;
• a source electrode and a drain electrode formed in the interlayer insulating layer, the source electrode and the drain electrode connected to the semiconductor layer;
• and
• a barrier rib covering the interlayer insulating layer, the source electrode, and the drain electrode, wherein
• the drain electrode contacts a side wall of the pixel opening and the drain electrode is connected to the pixel electrode.