A display device includes a first electrode, a second electrode disposed on the first electrode and facing the first electrode, a light emitting layer disposed between the first electrode and the second electrode and including a quantum dot, a metal oxide layer disposed between the first electrode and the second electrode and including a metal oxide, an auxiliary film disposed at the same level as the first electrode and including an inorganic material, and a pixel defining layer which covers at least a portion of the auxiliary film and which defines a pixel opening exposing a portion of the first electrode.