Display panel, display device including the same, and method of manufacturing the same

A display device, comprising:

• a first display panel;
• and
• a second display panel adjacent to the first display panel,
• wherein each of the first display panel and the second display panel includes:
• a first substrate;
• a first line disposed on the first substrate;
• a second substrate disposed on the first line, including a first portion which overlaps the first substrate and a second portion which does not overlap the first substrate, and having a through-hole which exposes the first line;
• a second line disposed on the second substrate and electrically connected to the first line through the through-hole;
• a display unit disposed on the second substrate and electrically connected to the second line;
• and
• a printed circuit board disposed on a surface of the first substrate which faces the second substrate and electrically connected to the first line, and
• wherein the printed circuit board of the first display panel overlaps the second display panel.