Display device and manufacturing method thereof

A manufacturing method of a display device comprising:

• forming a connection pattern and a dummy pattern spaced apart from each other on a substrate;
• forming a via layer including a contact portion exposing the connection pattern and a via hole exposing the dummy pattern, the via layer being disposed on the connection pattern;
• forming a pixel electrode electrically connected to the connection pattern through the contact portion on the via layer;
• forming a light emitting layer on the pixel electrode;
• forming a control layer on the light emitting layer;
• and
• forming a common electrode on the control layer,
• wherein the dummy pattern includes a first dummy pattern and a second dummy pattern disposed on the first dummy pattern, the first dummy pattern includes a first layer, a second layer, and a third layer each of which is made of a conductive material and is sequentially stacked, and the second dummy pattern includes an organic pattern including a first portion and a second portion having different areas in a plan view.