Organic light emitting display apparatus and method of manufacturing the organic light emitting display apparatus

An organic light-emitting display apparatus, comprising:

• a thin film transistor (TFT) on a substrate, the TFT including:
• an active layer,
• a gate electrode insulated from the active layer, the gate electrode including a lower gate electrode and an upper gate electrode,
• an interlayer insulation layer covering the gate electrode, and
• a source electrode and a drain electrode on the interlayer insulation layer, the source and drain electrodes contacting the active layer;
• an organic light-emitting device on the substrate, the organic light-emitting device including a stacked structure of a pixel electrode electrically connected to the TFT, an intermediate layer including an emissive layer, and an opposite electrode;
• a DBR layer between the active layer and the gate electrode of the TFT;
• and
• a high-refractive index layer between the substrate and the DBR layer, the high-refractive index layer having a smaller area an area of the pixel electrode.

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

• a first mask process of forming an active layer of a TFT and a high-refractive index layer on a substrate;
• a second mask process of forming a gate electrode of the TFT and a first electrode unit for forming a pixel electrode on the substrate;
• a third mask process of forming an interlayer insulation layer, the interlayer insulation layer including contact holes exposing edges of the active layer and a hole exposing a part of the first electrode unit;
• a fourth mask process of forming a source electrode and a drain electrode that contact the active layer via the contact holes and forming the pixel electrode from the first electrode unit;
• and
• a fifth mask process of forming a pixel definition layer exposing at least a part of the pixel electrode.