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Process and materials for aligning liquid crystals and liquid crystal optical elements

  • US 5,807,498 A
  • Filed: 03/29/1996
  • Issued: 09/15/1998
  • Est. Priority Date: 03/29/1996
  • Status: Expired due to Fees
First Claim
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1. A process for aligning liquid crystals adjacent to a surface of an optical alignment layer comprising:

  • (a) exposing at least one optical alignment layer, comprising anisotropically absorbing molecules, to polarized light;

    the polarized light having a wavelength within the absorption band of said anisotropically absorbing molecules;

    wherein the resulting exposed anisotropically absorbing molecules induce alignment of a liquid crystal medium at an angle + and -θ

    with respect to the direction of the polarization of the incident light and along the surface of tie optical alignment layer;

    (b) applying a liquid crystal medium to the optical alignment layer;

    wherein the anisotropically absorbing molecules consist essentially of at least one diaryl ketone.

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