Birefringent optical film, elliptically polarizing plate...

Details Birefringent optical film, elliptically polarizing plate... Birefringent optical film, elliptically polarizing plate...

2006-12-26

2006-12-26

Hess, Bruce H. (Department: 1774)

Stock material or miscellaneous articles

Liquid crystal optical display having layer of specified...

C428S412000, C349S117000, C349S118000

Reexamination Certificate

active

07153547

ABSTRACT:
The present invention provides a birefringent optical film having a high orientation for easily obtaining a desired retardation value and also a small photoelastic coefficient. The birefringent optical film includes at least two kinds of polymer materials. A total of products of Cn and Wn satisfies a numerical formula (1):in-line-formulae description="In-line Formulae" end="lead"?Σ(Cn×Wn)≦30×10−8cm2/N  (1)in-line-formulae description="In-line Formulae" end="tail"?where Cn and Wn denote respectively a photoelastic coefficient and a volume fraction of each polymer material, and at least one of the polymer materials of the film has a photoelastic coefficient value of at least 60×10−8cm2/N.

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