Organic light-emitting display device and method of manufacturing the same

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

• sequentially forming a first insulating film, which comprises a stack of a first sub-insulating film and a second sub-insulating film, and a film for forming a semiconductor layer on a substrate in which a light-emitting region and a TFT region are defined;
• forming a first photoresist pattern on the film for forming the semiconductor layer;
• etching the film for forming the semiconductor layer, the second sub-insulating film, and the first sub-insulating film using the first photoresist pattern as an etch mask;
• removing the first photoresist pattern and then sequentially forming a second insulating film, which comprises a stack of a third sub-insulating film and a fourth sub-insulating film, and a conductive film for forming a gate electrode on an entire surface of the substrate having a semiconductor layer;
• forming a second photoresist pattern on the conductive film for forming the gate electrode;
• and
• etching the conductive film for forming the gate electrode and the fourth sub-insulating film using the second photoresist pattern as an etch mask.