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PHASE DIFFERENCE FILM

  • US 20200131309A1
  • Filed: 12/18/2019
  • Published: 04/30/2020
  • Est. Priority Date: 06/28/2017
  • Status: Active Grant
First Claim
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1. A phase difference film comprising:

  • a copolymer containing at least one selected from a unit represented by Formula (1) and a unit represented by Formula (2), and a unit represented by Formula (3),wherein 20 nm<

    Re (548)<

    300 nm,0.5<

    Re (446)/Re (548)<

    1.0, and1.0<

    Re (629)/Re (548)<

    2.0;

    here, Re (446), Re (548), and Re (629) represent in-plane retardation at respective wavelengths of 446 nm, 548 nm, and 629 nm;

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