Birefringent optical film, elliptically polarizing plate using the same, and liquid crystal display using the same
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United States of America Patent
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May 30, 2006
Grant Date -
Oct 14, 2004
app pub date -
Dec 17, 2003
filing date -
Dec 19, 2002
priority date (Note) -
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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): .SIGMA.(Cn.times.Wn).ltoreq.20.times.10.sup.-8 cm.sup.2/N (1) 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.times.10.sup.-8 cm.sup.2/N, while at least one of the remaining polymer materials has a negative value of photoelastic coefficient.
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