an organic electroluminescent display device has a structure which suppresses a leakage current generated in an organic electroluminescent layer and achieves a low power consumption and excellent light - emitting characteristics . the organic electroluminescent display device includes a first electrode , an organic electroluminescent layer , and a second electrode , stacked in this order on a substrate , wherein the organic electroluminescent layer includes a conductive layer and a light - emitting layer , the conductive layer has a trapezoidal cross section which widens downwardly , and the light - emitting layer covers upper and side surfaces of the conductive layer .