An organic electroluminescent (EL) display device includes an organic EL
element formed on a substrate. The organic EL element includes a lower
electrode, an organic EL layer and an upper electrode that are
sequentially stacked on the substrate. A flat panel is attached to the
substrate to encapsulate the organic EL element. At least one through hole
is formed in the organic EL display device so as to allow gas inside the
organic EL display device to flow out during an encapsulation process. A
cap is provided to shut the one or more through holes.
