Disclosed is an organic electroluminescent device (OELD) includes a first substrate including a pixel region that includes an element region and a light emission region; a storage capacitor disposed at the element region, and including a first storage electrode, a first buffer layer on the first storage electrode, and a second storage electrode on the first buffer layer; a second buffer layer on the storage capacitor; a plurality of TFTs on the second buffer layer at the element region; and a passivation layer on the plurality of TFTs, wherein the storage capacitor overlaps at least one of the plurality of TFTs.