The first connection layer 82 and the data line DL of the pixel circuit PC may be located on the same player and include the same material. The first connection layer 82 may be located between the first light-emitting driving circuit 30 and the edge 100E of the lower substrate 100.

In FIG. 5, the first width W1 of the common power supply line 70 may be greater than a width of the first light-emitting driving circuit 30. The common power supply line 70 may cover the first light-emitting driving circuit 30. The first end portion 70E1 of the common power supply line 70 may extend toward the edge 100E of the lower substrate 100 and the second end portion 70E2 of the common power supply line 70 may extend toward the first scan driving circuit 20.

End portions of the second connection layer 92 and the second thermally conductive layer 90 may be substantially aligned with each other with respect to the second end portion 70E2 of the common power supply line 70. When the second connection layer 92 and the second thermally conductive layer 90 providing a path through which heat is diffused are located so that the end portions of the second connection layer 92 and the second thermally conductive layer 90 are substantially aligned with each other with respect to the second end portion 70E2 of the common power supply line 70, heat applied in forming the seal 400 may be prevented from being transferred to the first scan driving circuit 20 located adjacent to the display area DA.