Broadband reflective polarizer for liquid crystal display using overcoating method

  • US 20070166482A1
  • Filed: 11/19/2004
  • Published: 07/19/2007
  • Est. Priority Date: 08/02/2004
  • Status: Active Grant
First Claim
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1. A method of manufacturing a broadband reflective polarizing plate using a laminated coating technique, comprising the steps of:

  • (a) coating a substrate film on which a first orientation layer is coated with a cholesteric liquid crystal solution;

    (b) irradiating a cholesteric liquid crystal coating layer formed in (a) with UV to form a liquid crystal film;

    (c) coating said liquid crystal layer formed in (b) with a second orientation layer;

    (d) coating said second orientation layer with said cholesteric liquid crystal solution having different selective light-reflecting central wavelengths on to form a cholesteric liquid crystal coating layer; and

    (e) irradiating said cholesteric liquid crystal coating layer with UV to form a cholesteric liquid crystal film, wherein two or more cholesteric liquid crystal layers having different selective light-reflecting central wavelengths, which are manufactured by repeatedly performing the above steps (c) to (e) once or more times, are sequentially laminated in order from shorter wavelength to longer wavelength in the laminated coating method, thus forming a broadband reflective polarizing plate covering the range of visible light as a selective reflection wavelength region.

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