Organic electroluminescent display device

An organic electroluminescent display device comprising:

• a circular polarization plate;
• and
• an organic electroluminescent display element,
• wherein the circular polarization plate includes an optically anisotropic layer and a polarizer from an organic electroluminescent display element side, and
• in a case where a ratio of brightness of P-polarized light to brightness of S-polarized light during white display of the organic electroluminescent display element in a direction in which a polar angle with respect to a normal direction of the organic electroluminescent display element is 60° is determined at each azimuthal angle rotated by 45° with reference to a direction parallel to a transmission axis of the polarizer, an arithmetic mean value of the ratios of the brightness of the P-polarized light to the brightness of the S-polarized light at the azimuthal angles is defined as x, and the arithmetic mean value x is 1.00 or more, and
• a ratio of an in-plane retardation at a wavelength of 600 nm to an in-plane retardation at a wavelength of 440 nm in the optically anisotropic layer is defined as y,
• the organic electroluminescent display device satisfies Requirement 1 and Requirement 2,
• y
• ≤
• -
• 0
• .
• 1
• ⁢
• 5
• ⁢
• 5
• ⁢
• x
• +
• 1.655
• Requirement
• ⁢
• 1
• y
• ≥
• 0.
• 1
• ⁢
• 7
• ⁢
• 0
• ⁢
• x
• +
• 0
• .
• 9
• ⁢
• 8
• ⁢
• 0
• Requirement
• ⁢
• 2
• the ratio of the brightness of the P-polarized light to the brightness of the S-polarized light is an arithmetic mean value of ratios of the brightness of the P-polarized light to the brightness of the S-polarized light at each wavelength at intervals of 10 nm in a wavelength range of 420 to 680 nm.