Quarter wave plate comprising two optically anisotropic layers

Details Quarter wave plate comprising two optically anisotropic layers Quarter wave plate comprising two optically anisotropic layers

2005-02-08

2005-02-08

Ngo, Julie-Huyen L. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S098000, C349S194000, C349S119000

Reexamination Certificate

active

06853423

ABSTRACT:
A circularly polarizing plate comprises a linearly polarizing membrane and a quarter wave plate. The quarter wave plate comprises an optically anisotropic layer A and an optically anisotropic layer B. The quarter wave plate has such an optical characteristic that a retardation value essentially is a quarter of a wavelength when the retardation value is measured at the wavelength of 450 nm, 550 nm and 650 nm. One of the optically anisotropic layers A and B is a layer made from liquid crystal molecules, and the other is a polymer film or a layer made from liquid crystal molecules.

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