Optical resin film and polarizing film and liquid crystal display device using the same

  • US 7,583,342 B2
  • Filed: 08/16/2006
  • Issued: 09/01/2009
  • Est. Priority Date: 08/17/2005
  • Status: Active Grant
First Claim
Patent Images

1. An optical resin film, which has Re (λ

  • ) and Rth (λ

    ) satisfying retardation requirements (A) to (D), and has an in-plane width direction retardation (Re) variation coefficient of 5% or less and a thickness direction retardation (Rth) variation coefficient of 10% or less;

    (A) 0.1<

    Re (450)/Re (550)<

    0.95(B) 1.03<

    Re (650)/Re (550)<

    1.93(C) 0.4<

    (Re/Rth (450))/(Re/Rth (550)))<

    0.95(D) 1.05<

    (Re/Rth (650)/(Re/Rth (550))<

    1.9wherein Re (λ

    ) represents an in-plane retardation value of the optical resin film with respect to light having a wavelength of λ

    nm;

    Rth (λ

    ) represents a thickness direction retardation value of the optical resin film with respect to light having a wavelength of λ

    nm; and

    Re/Rth (λ

    ) represents a ratio of an in-plane retardation value to a thickness direction retardation value of the optical resin film with respect to light having a wavelength of λ

    nm (unit;

    nm).

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