Thin film transistor array substrate, organic light-emitting display device including the same, and method of manufacturing the organic light-emitting display device

An organic light-emitting display device, comprising:

• a TFT disposed on a substrate, the TFT including an active layer, a gate electrode, a source electrode, a drain electrode, a first insulating layer disposed between the active layer and the gate electrode, and a second insulating layer disposed between the gate electrode and the source and drain electrodes;
• a pixel electrode disposed on the first insulating layer and the second insulating layer, the pixel electrode being connected to one of the source electrode and the drain electrode;
• a capacitor including a lower electrode disposed on a same layer as the gate electrode, and including an upper electrode including a same material as a material of the pixel electrode, the lower electrode and the TFT being separated from each other without overlapping with each other;
• a third insulating layer directly disposed between the second insulating layer and the pixel electrode and between the lower electrode and the upper electrode;
• a fourth insulating layer that covers the source electrode, the drain electrode, and the capacitor, and exposes the pixel electrode;
• an organic light-emitting layer disposed on the pixel electrode;
• and
• a counter electrode disposed on the organic light-emitting layer,
• wherein the lower electrode has a lower electrode bottom surface directly contacting the first insulating layer, and the gate electrode has a gate electrode bottom surface directly contacting the first insulating layer.