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Title:
RETARDATION PLATE, AND CIRCULAR POLARIZATION PLATE, LIQUID CRYSTAL DISPLAY DEVICE, AND ORGANIC EL DISPLAY DEVICE INCLUDING RETARDATION PLATE
Document Type and Number:
WIPO Patent Application WO/2021/060247
Kind Code:
A1
Abstract:
This retardation plate comprises a first optically anisotropic layer in which the spiral axis of a stick-shaped liquid crystal compound is aligned with the direction of thickness and which has an in-plane phase difference (Re) of substantially 1/2 wavelength, and a second optically anisotropic layer in which the spiral axis of a stick-shaped liquid crystal compound is aligned with the direction of thickness and which has an in-plane phase difference (Re) of 1/4 wavelength, the retardation plate being characterized by further comprising a third optically anisotropic layer that is disposed between the first optically anisotropic layer and the second optically anisotropic layer and that satisfies equation (1). Equation (1): nx ≃ ny < nz (In the equation, nx and ny are refractive indices in the plate planar directions crossing each other at a right angle, and nz is the refractive index in the direction perpendicular to the plate planar direction.)

Inventors:
KUSUMI TAKAHIRO (JP)
NAKAMURA DAISUKE (JP)
VENEMA JAN WILLEM (NL)
Application Number:
PCT/JP2020/035704
Publication Date:
April 01, 2021
Filing Date:
September 23, 2020
Export Citation:
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Assignee:
NIPPON KAYAKU KK (JP)
DEJIMA TECH BV (NL)
International Classes:
G02B5/30; G02F1/1335; G02F1/13363; G09F9/00; G09F9/30; H01L27/32; H01L51/50; H05B33/02
Domestic Patent References:
WO2016043219A12016-03-24
Foreign References:
JP2014209220A2014-11-06
JP2015079230A2015-04-23
JP2015040904A2015-03-02
JP2007286141A2007-11-01
JP2007188033A2007-07-26
Attorney, Agent or Firm:
ASAMURA PATENT OFFICE, P.C. (JP)
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