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Variable transmittance birefringent device

  • US 20020140884A1
  • Filed: 03/29/2001
  • Published: 10/03/2002
  • Est. Priority Date: 03/29/2001
  • Status: Active Grant
First Claim
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1. A variable reflectance vehicle mirror which can be controlled to adjust reflectivity, comprising:

  • a super twisted nematic (STN) liquid crystal cell having a front side and a rear side;

    a first polarization filter positioned on the front side of said STN liquid crystal cell;

    a second polarization filter positioned on the rear side of said STN liquid crystal cell;

    a reflective layer positioned adjacent to said second polarization filter; and

    a control circuit connected to said STN liquid crystal cell for controlling the birefringence of the STN liquid crystal cell to adjust the degree of reflection of the mirror.

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