An organic electroluminescent display device includes forming an organic electroluminescent panel that includes a viewing surface for displaying images and an opposing surface and includes a plurality of source pads in a peripheral region of the organic electroluminescent panel; configuring at least one source IC to be on the opposing surface of the organic electroluminescent panel, wherein the at least one source IC outputs a source signal corresponding to the source pad; configuring a thermally conductive unit to contact the at least one source IC at an inner surface of the thermally conductive unit; and configuring a bottom case to contact an outer surface of the thermally conductive unit.