a lower substrate including a display area and a peripheral area;

a light emitting structure disposed in the display area on the lower substrate;

a lower wire disposed in the peripheral area on the lower substrate;

an upper wire disposed in the peripheral area on the lower wire and partially overlapping the lower wire;

an insulating layer structure including a first contact hole that exposes a first portion of the upper wire which overlaps the lower wire along a first direction parallel to a top surface of the lower substrate and a first portion of the lower wire which is disposed adjacent to a portion of the lower wire that overlaps the upper wire in a plan view; and

a connection pattern disposed on the insulating layer structure, the lower wire, and the upper wire, and electrically connecting the upper wire to the lower wire, the connection pattern including a first portion disposed in the first contact hole and a second portion disposed to surround the first contact hole,

wherein the upper wire includes a protrusion portion which protrudes out of the insulating layer structure to form an undercut portion disposed under the protrusion portion in the insulating layer structure,

wherein the lower wire and the upper wire are not connected to each other via the first portion of the connection pattern, and

wherein the lower wire and the upper wire are connected to each other via the second portion of the connection pattern.