Display device and manufacturing method thereof

A display device comprising:

• a substrate including a display area including a plurality of pixel electrodes arranged therein, the substrate including a picture-frame area outside the display area;
• a wiring pattern including terminals arranged in the picture-frame area;
• an organic layer formed on the pixel electrodes and including a light emitting layer;
• a counter electrode formed on the organic layer;
• a sealing layer formed on the counter electrode;
• a drive circuit formed in the picture-frame area for controlling light emission of the light emitting layer;
• a first test electrode formed in the picture-frame area and electrically separated from the drive circuit;
• a second test electrode formed in the picture-frame area electrically separated from the drive circuit and the first test electrode;
• and
• a picture-frame insulating layer formed on the wiring pattern and including openings to expose the respective terminals, the picture-frame insulating layer formed entirely on and in direct contact with an upper surface of the first test electrode, the picture-frame insulating layer formed entirely below and in direct contact with a lower surface of the second test electrode,
• wherein the first test electrode and the second test electrode are displaced from each other so as not to be overlapped in a plan view, and
• the first test electrode and the second test electrode are adjacent to at least one of the terminals in the plan view.