Display device having outer signal line adjacent to a side surface

A display device includes: a base layer comprising a top surface, a bottom surface opposite the top surface, and a plurality of side surfaces connecting the top surface and the bottom surface, wherein a display area and a non-display area adjacent to the display area are defined; an outer line overlapping the non-display area, on the top surface, and adjacent to any one of the plurality of side surfaces; a light emitting element layer overlapping the display area, on the top surface, and comprising a light emitting element; and a connection line connecting the outer line and the light emitting element, wherein the outer line comprises a center line extending from the connection line in a first direction and a branch line extending from the center line in a second direction crossing the first direction.