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Phase difference plate comprising polymer film containing compound having rod- shaped molecular structure

  • US 20040096594A1
  • Filed: 09/12/2003
  • Published: 05/20/2004
  • Est. Priority Date: 03/14/2001
  • Status: Active Grant
First Claim
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1. A phase retarder comprising a single polymer film which contains a rod-like compound exhibiting a maximum absorption wavelength (λ

  • max) of shorter than 250 nm in an ultraviolet absorption spectrum measured in a form of a solution of the compound, wherein the film has a retardation value of Re450 in the range of 60 to 135 nm measured at a wavelength of 450 nm, and a retardation value of Re590 in the range of 100 to 170 nm measured at a wavelength of 590 nm, said Re450 and Re590 satisfying a condition of Re590-Re450≧

    2 nm.

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