Optical sheet, polarizer and liquid-crystal display device

Details Optical sheet, polarizer and liquid-crystal display device Optical sheet, polarizer and liquid-crystal display device

2005-04-19

2005-04-19

Watkins, III, William P. (Department: 1772)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

With viewing layer of specified composition

C428S001100, C428S001310, C349S118000, C349S120000

Reexamination Certificate

active

06881456

ABSTRACT:
An optical sheet constituted by a retardation film; and a transparent layer provided on one of opposite surfaces of the retardation film. The retardation film exhibits Nz=(nx−nz)/(nx−ny) in a range of from 0.6 to 0.9 and (nx−ny)d in a range of from 200 to 350 nm in which d is a thickness of the retardation film, nz is a refractive index in a direction of a Z axis expressing a direction of the thickness d of the retardation film, nx is a refractive index in a direction of an X axis expressing a direction of the retardation film in a plane perpendicular to the Z axis while the X axis also expresses a direction of the highest in-plane refractive index, and ny is a refractive index in a direction of a Y axis expressing a direction of the retardation film perpendicular both to the Z axis and to the X axis. The transparent layer has a thickness not larger than 10 μm and exhibits refractive index anisotropy of nx≈ny>nz.

REFERENCES:
patent: 5528400 (1996-06-01), Arakawa
patent: 5805253 (1998-09-01), Mori et al.
patent: 5999243 (1999-12-01), Kameyama et al.
patent: 6166799 (2000-12-01), Kameyama et al.
patent: 62-210423 (1987-09-01), None
patent: 04371903 (1992-12-01), None

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