Laminated optical film, polarizing plate and liquid crystal...

Details Laminated optical film, polarizing plate and liquid crystal... Laminated optical film, polarizing plate and liquid crystal...

2008-09-22

2011-11-08

Healy, Brian M. (Department: 2883)

Liquid crystal cells, elements and systems

Liquid crystal optical element

C349S096000, C349S117000, C349S118000, C349S119000, C349S120000, C349S121000

Reexamination Certificate

active

08054441

ABSTRACT:
A laminated optical film including a first optical anisotropic layer, and a second optical anisotropic layer, wherein Relationship (1), −10 nm≦ΔRe1−ΔRe2≦10 nm, is satisfied when a slow phase axis of the first optical anisotropic layer is substantially perpendicular to a slow phase axis of the second optical anisotropic layer, wherein Relationship (2), −10 nm≦ΔRe1+ΔRe2≦10 nm, is satisfied when the slow phase axis of the first optical anisotropic layer is substantially parallel to the slow phase axis of the second optical anisotropic layer, wherein an in-plane retardation value Re of the film as a whole satisfies 30 nm≦Re≦500 nm, where ΔRe1 denotes a value calculated from “Re1 (at a temperature of 50° C.)−Re1 (at a temperature of 25° C.)” concerning the first optical anisotropic layer, and ΔRe2 denotes a value calculated from “Re2 (at a temperature of 50° C.)−Re2 (at a temperature of 25° C.)” concerning the second optical anisotropic layer.

REFERENCES:
patent: 2007/0200977 (2007-08-01), Egi et al.
patent: 2009/0091694 (2009-04-01), Sasada
patent: 2006-039211 (2006-02-01), None

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