The display apparatus 2 of FIG. 5, as compared to the embodiment of FIG. 3, further includes a second thermally conductive layer 90 located under the common power supply line 70. The display area DA other than the peripheral area PA may be the same as that of FIG. 3 Thus an explanation thereof will not be repeated and the following will focus on differences.

In FIG. 5, the second thermally conductive layer 90 may be located between the common power supply line 70 and the lower substrate 100. The second thermally conductive layer 90 may overlap the second end portion 70E2 of the common power supply line 70. A side of the second thermally conductive layer 90 may be substantially aligned with the second end portion 70E2 of the common power supply line 70, and the other side of the second thermally conductive layer 90 may extend toward the first light-emitting driving circuit 30. In this case, the second thermally conductive layer 90 may be spaced apart from the first light-emitting driving circuit 30 by a predetermined interval.

In FIG. 5, the second thermally conductive layer 90 and the upper electrode 146 of the pixel circuit PC of the display area DA may be located on the same layer and may include the same material. In an embodiment, the second thermally conductive layer 90 and at least one of the data line DL of the pixel circuit PC, the upper electrode 146, and the gate electrode 136 may be located on the same layer and may include the same material.