Display device and manufacturing method thereof

A manufacturing method of a display device, comprising:

• forming a lower electrode above a substrate in a display area including a pixel;
• forming a rib comprising an aperture overlapping the lower electrode;
• forming a partition on the rib in the display area, the partition comprising a conductive lower portion and an upper portion protruding from a side surface of the conductive lower portion;
• forming a line comprising the conductive lower portion and the upper portion in a surrounding area between an end portion of the substrate and the display area;
• forming a thin film including an upper electrode which faces the lower electrode and an organic layer which emits light based on a potential difference between the lower electrode and the upper electrode;
• and
• forming a first sealing layer which covers the thin film and the partition by an inorganic material.