A method of manufacturing a display device includes: providing a first substrate, a second substrate, and a plurality of connection lines, wherein the first substrate has a base substrate, wherein the second substrate faces the first substrate, and wherein the plurality of connection lines are disposed between the base substrate and the second substrate; grinding a side surface of the base substrate, a side surface of the second substrate, and side surfaces of the plurality of connection lines; and simultaneously transferring a conductive film and laser-curing the conductive film, wherein the conductive film is transferred to the ground side surface of the base substrate, the ground side surface of the second substrate, and the ground side surfaces of the plurality of connection lines.