Display apparatus with optical interference layer having a larger refractive index than a white light emitting layer

A display apparatus comprising:

• a substrate;
• a plurality of light emitting elements formed on the substrate;
• a reflection layer provided between the substrate and the light emitting elements;
• and
• an optical interference layer provided between the light emitting elements and the reflection layer,
• wherein the plurality of light emitting elements includes a transparent lower electrode, an organic layer including a white light emitting layer, and an optically transparent upper electrode in this order from the substrate side,
• wherein an optical distance from the white light emitting layer to the reflection layer is equal in the plurality of light emitting elements,
• wherein the optical interference layer has a larger refractive index than a refractive index of the white light emitting layer and a ratio (nr/nb) of a refractive index (nr) with respect to a red wavelength region to a refractive index (nb) with respect to a blue wavelength region in the optical interference layer is less than 0.95, and
• wherein orders of interference m in the blue, green, and red wavelength regions are 5, 4, and 3, respectively, when the optical distance from the light emitting layer to the reflection layer is (2m+1)λ/4±(⅛)λ, wherein λ represents wavelength.