Manufacturing method of display device

A manufacturing method of a display device, the method comprising:

• preparing a substrate which includes a metal pattern and in which a display area and a non-display area are defined;
• forming a first active pattern disposed on the substrate and including a first area, a second area, and a first channel area disposed between the first area and the second area;
• forming a first gate electrode pattern overlapping the first channel area on the first active pattern;
• forming a second active pattern on the first gate electrode pattern;
• forming an etch stop pattern in a same layer as the second active pattern and overlapping the first area and the second area of the first active pattern;
• forming an inter-insulating layer covering the etch stop pattern;
• defining a first hole exposing the etch stop pattern and a second hole exposing the inter-insulating layer;
• defining a third hole extended to the second hole and exposing a top surface of the substrate;
• defining a fourth hole extended to the first hole and penetrating the etch stop pattern and a fifth hole extended to the third hole and exposing the metal pattern;
• forming a metal pattern connection electrode disposed on the metal pattern and connected to the metal pattern through the fifth hole;
• and
• forming a light-emitting device on the metal pattern connection electrode.