Abstract: A display device includes a transistor above a substrate, a planarization layer above the transistor and having a first open area, an anode electrode in the first open area as well as a side portion and a part of a top surface of the planarization layer opposite to the first open area, a bank covering a part of the anode electrode and having a second open area corresponding to the first open area, an organic layer on the anode electrode exposed by the second open area, a cathode electrode on the organic layer, and a capping layer above the cathode electrode and including a first capping layer having a first refractive index, a second capping layer having a second refractive index, and a third capping layer having a third refractive index. The first refractive index and the third refractive index are relatively lower than the second refractive index.

Abstract: An organic light-emitting device and a heterocyclic compound, the device including a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode and including an emission layer, wherein the organic layer includes a heterocyclic compound represented by Formula 1:

Abstract: An organic light-emitting device and a heterocyclic compound, the device including a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode and including an emission layer, wherein the organic layer includes a heterocyclic compound represented by Formula 1: