Patent ID: 8319231

Claim:
A display device comprising: a first organic electroluminescent element; and a second organic electroluminescent element emitting a color different from a color emitted by the first organic electroluminescent element, wherein the first and second organic electroluminescent elements each include, in order, a first electrode, a first charge transport layer containing a charge-transporting material and a dopant material, a second charge transport layer containing a charge-transporting material and a dopant material, a light-emitting layer, and a second electrode; the first charge transport layer is common to the first and second organic electroluminescent elements and has a uniform thickness; the second charge transport layer of the first organic electroluminescent element is different in thickness from the second charge transport layer of the second organic electroluminescent element; and the concentration of the dopant material in the first charge transport layer is less than the concentration of the dopant material in the second charge transport layer.