Organic light emitting diode display and manufacturing method thereof

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

• forming a polysilicon layer on a substrate main body;
• forming a semiconductor layer intermediate and a first capacitor electrode intermediate by patterning the polysilicon layer;
• forming a gate insulating layer on the semiconductor layer intermediate and the first capacitor electrode intermediate;
• forming a gate electrode on the semiconductor layer intermediate with the gate insulating layer therebetween;
• and
• forming a second capacitor electrode on the first capacitor electrode intermediate with the gate insulating layer therebetween, such that the second capacitor electrode includes a convex electrode portion and a concave electrode portion, the concave electrode portion being thinner than each of the convex electrode portion and the second capacitor electrode;
• and
• doping an impurity into the semiconductor layer intermediate and the first capacitor electrode intermediate to form a semiconductor layer and a first capacitor electrode, respectively, such that the impurity is transmitted through the second capacitor electrode and is doped into the first capacitor electrode.