Organic light emitting diode display and method of manufacturing the same

A method of manufacturing an organic light emitting diode display, the method comprising:

• forming a semiconductor layer on a substrate main body, the semiconductor layer including an impurity-doped polycrystalline silicon layer;
• forming a first capacitor electrode on the substrate main body, such that bottom surfaces of the first capacitor electrode and semiconductor layer facing the substrate main body are substantially coplanar, and the first capacitor electrode includes an impurity-doped polycrystalline silicon layer;
• forming a gate insulating layer on the semiconductor layer and the first capacitor electrode;
• forming a gate electrode on the semiconductor layer with the gate insulating layer therebetween;
• and
• forming a second capacitor electrode on the first capacitor electrode with the gate insulating layer therebetween, such that bottom surfaces of the second capacitor electrode and gate electrode facing the substrate main body are substantially coplanar, and the second capacitor electrode has a smaller thickness than the gate electrode.