Patent ID: 7915812

Claim:
An organic light-emitting device disposed on a substrate, which comprises: a first electrode; an emission layer; and a second electrode provided in the mentioned order from the substrate side, an optical path between a first reflective surface located on the first electrode side with respect to the emission layer and a second reflective surface located on the second electrode side with respect to the emission layer being set so as to resonate light emitted in the emission layer, and which has a first region in which the optical path is relatively short and is L 1 and a second region in which the optical path is relatively long and is L 2 , wherein L 1 and L 2 are set so as to satisfy Expression 1 with resonant wavelengths λ 1 , λ 2 , and λ 3 , a sum φt of phase shifts when light is reflected by the first reflective surface and the second reflective surface, and a viewing angle α: λ 1 =2 L 1 /( p−φt/ 2π) λ 2 =2 L 2 /( q+ 1−φ t/ 2π) λ 3 =2 L 2 cos α/( q−φt/ 2π) λ 1 =λ 2 =λ 3 (Expression 1) wherein p and q each independently represent a positive integer and α is not 0°.