Display device and manufacturing method thereof

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

• forming a first flexible substrate comprising a first pad electrode;
• forming a driver;
• and
• mounting the driver on the first flexible substrate,
• wherein the forming of the driver comprises:
• forming a second pad electrode on a side of a circuit board comprising a driving circuit;
• forming a photosensitive film pattern having an opening overlapping the second pad electrode on a side of the second pad electrode;
• forming a convex structure material layer in the opening, allowing the convex structure material layer to reflow to form a convex structure having an oval cross-section;
• forming a bump electrode in the opening, the bump electrode comprising a column covering the convex structure and a convex portion protruding from one side of the column;
• and
• removing the photosensitive film pattern.