Optical film, image display device, and liquid-crystal...

Details Optical film, image display device, and liquid-crystal... Optical film, image display device, and liquid-crystal...

2006-08-22

2008-11-25

Healy, Brian M (Department: 2883)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S117000, C349S096000

Reexamination Certificate

active

07456919

ABSTRACT:
An optical film includes: a polarizer having an absorption axis; and at least three retardation films, each having a slow axis, wherein the absorption axis of the polarizer intersects the slow axis of each of the at least three retardation films at right angles and is parallel to the slow axis of each of the at least three retardation films, the slow axis of each of the at least three retardation films are parallel to each other, a total amount of Nz value of each of the at least three retardation films, the Nz value being defined by formula (I), is half as many as the number of the at least three retardation films, and an in-plane retardation Re1of each of the at least three retardation films, the in-plane retardation Re1being defined by formula (II), ranges from 200 to 350 nm:in-line-formulae description="In-line Formulae" end="lead"?Nz=(nx1−nz1)/(nx1−ny1)   (I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Re1=(nx1−ny1)×d1.   (II)in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
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patent: 2006/0285051 (2006-12-01), Jeon et al.
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patent: 2007/0046871 (2007-03-01), Tasaka
patent: 2005-99476 (2005-04-01), None

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