Circular polarizing plate, wideband lambda/4 plate, and organic electroluminescence display device

圆偏振片、宽频带λ/4波片、以及有机电致发光显示装置

Abstract

圆偏振片,依次具有:偏振膜、在相对于上述偏振膜的吸收轴成15°±5°的角度的方向上具有滞相轴的λ/2波片、以及在相对于上述偏振膜的吸收轴成75°±5°的角度的方向上具有滞相轴的λ/4波片,上述λ/2波片的波长色散与上述λ/4波片的波长色散大体上一致,用nx表示面内的滞相轴方向的折射率、用ny表示面内的进相轴方向的折射率、用nz表示厚度方向的折射率的情况下,上述λ/2波片和上述λ/4波片的一者的折射率为nz≥nx>ny,上述λ/2波片和上述λ/4波片的另一者的折射率为nx>ny≥nz。
A circular polarizing plate provided with a polarizing film, a lambda/2 plate having a slow axis in a direction angled 15 deg+/-5 deg from the absorption axis of the polarizing film, and a lambda/4 plate having a slow axis in a direction angled 75 deg+/-5 deg from the absorption axis of the polarizing film, in this order, the wavelength dispersion of the lambda/2 plate and the wavelength dispersion of the lambda/4 plate being substantially consistent, and the refractive index of one of the lambda/2 plate and the lambda/4 plate satisfying the expression nz>=nx>ny and the refractive index of the other of the lambda/2 plate and the lambda/4 plate satisfying the expression nx>ny>=nz, where nx is the in-plane refractive index in the slow axis direction, ny is the in-plane refractive index in the fast axis direction, and nz is the refractive index in the thickness direction.

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