The first TFE layer 451 may be disposed on the upper electrode 340. The first TFE layer 451 may cover the upper electrode 340, and may be disposed to have a substantially uniform thickness along a profile of the upper electrode 340. The first TFE layer 451 may prevent or substantially prevent the light emitting structure from being deteriorated by the permeation of moisture, water, oxygen, etc. In addition, the first TFE layer 451 may protect the light emitting structure from external impacts. The first TFE layer 451 may include inorganic materials.

The second TFE layer 452 may be disposed on the first TFE layer 451. The second TFE layer 452 may improve the flatness of the display panel 200, and may protect the light emitting structure. The second TFE layer 452 may include organic materials.

The third TFE layer 453 may be disposed on the second TFE layer 452. The third TFE layer 453 may cover the second TFE layer 452, and may be disposed to have a substantially uniform thickness along a profile of the second TFE layer 452. The third TFE layer 453, together with the first TFE layer 451 and the second TFE layer 452, may prevent or substantially prevent the light emitting structure from being deteriorated by the permeation of moisture, water, oxygen, etc. In addition, the third TFE layer 453, together with the first TFE layer 451 and the second TFE layer 452, may protect the light emitting structure from external impacts. The third TFE layer 453 may include inorganic materials. Alternatively, the TFE structure 450 may have a five-layer structure in which first to fifth TFE layers are stacked, or a seven-layer structure in which first to seventh TFE layers are stacked.