Patent ID: 7218049

Claim:
A display device comprising: a semi-transparent reflective layer; a reflective layer; and an organic layer including a light emitting layer interposed between the semi-transparent reflective layer and the reflective layer, the semi-transparent reflective layer and the reflective layer forming a resonant cavity, wherein said resonant cavity has an optical path length L determined so that a spectrum peak shift produced by a difference of viewing angles in the 0° to 60° range is less than 30 nm, and wherein said optical path length L has a positive minimum value in a range that satisfies the equation: (2 L )/λ+Φ/(2π)= m ( m is an integer) where Φ radians is the sum of phase change amounts to reflection of the light emitted from the light emitting layer at both boundaries of the resonant cavity and λ is the peak wavelength of the spectrum extracted from the display device.