Circular polarizing plate, wideband lambda/4 plate, and organic electroluminescence display device
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United States of America Patent
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Apr 9, 2019
Grant Date -
Sep 14, 2017
app pub date -
Sep 10, 2015
filing date -
Sep 17, 2014
priority date (Note) -
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Abstract
A circularly polarizing plate includes: a polarizing film; a λ/2 plate having a slow axis in a direction forming an angle of 15°±5° with respect to an absorption axis of the polarizing film; and a λ/4 plate having a slow axis in a direction forming an angle of 75°±5° with respect to the absorption axis of the polarizing film, which are provided in this order. A wavelength dispersion of the λ/2 plate and a wavelength dispersion of the λ/4 plate approximately coincide with each other. A refractive index of one of the λ/2 plate and the λ/4 plate is nz≥nx>ny, and a refractive index of the other of the λ/2 plate and the λ/4 plate is nx>ny≥nz, where nx, ny and nz represent refractive indices in in-plane slow axis, in-plane fast axis, and thickness directions, respectively.
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