An organic light emitting display provided according to the invention
maintains light emission efficiency and elongates its lifetime by
radiating heat generated from organic light emitting elements to the
outside of an encapsulated area. In the organic light emitting display, a
part of a cathode is extended to the outside of the encapsulated area of
a main substrate to form a radiation section integrally with the cathode.
Heat generated from organic light emitting elements is diffused and
radiated from the radiation section so that the heat can be discharged
therefrom.