Patent ID: 8669559

Claim:
An image display apparatus, comprising multiple light emitting elements, wherein each of the light emitting elements includes: (a) a light-emitting layer; and (b) a layer having a plurality of first mediums and a second medium having a refractive index different from a refractive index of the first medium, for extracting light generated from the light-emitting layer, wherein the first mediums are non-periodically arranged in the second medium, and wherein the first mediums are arranged so as to satisfy the following relational expression: 0.10 < σ / L 1 + ( 1 - ( σ / L ) 2 ) ⁢ ( L / L m ⁢ ⁢ ax - 1 ) where L is an average distance between centers of gravity of the first medium, Lmax is a most frequent distance between the centers, and σ is a variation of distance between centers.