Electro-optic system configured to reduce a perceived color change

  • US 9,096,181 B2
  • Filed: 02/23/2015
  • Issued: 08/04/2015
  • Est. Priority Date: 08/09/2010
  • Status: Active Grant
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First Claim
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1. An electrochromic system comprising:

  • an electrochromic element comprising;

    a front element comprising first and second surfaces;

    a rear element comprising third and fourth surfaces, wherein said front and rear elements are sealably bonded together in a spaced-apart relationship to define a chamber, such that said second surface and said third surface face one another; and

    an electrochromic medium contained in said chamber, wherein said electrochromic medium is adapted to be in at least a high transmittance state and a low transmittance state;

    a reflector electrode on said third surface; and

    a transparent electrode on said second surface;

    wherein said transparent electrode is selected to have a beneficial effect on the reflected color of said electrochromic element, such that during a color excursion the reflected C* remains below approximately 20; and

    wherein light passing through at least a portion of said electrochromic element has at least a first primary and a second primary, and said first and said second primaries each have a first hue (hab) when viewed through said electrochromic medium in said high transmittance state and a second hue (hab

    ) when viewed through said electrochromic element in approximately said low transmittance state, wherein a change in said first and second hues (Δ

    hab) for both said first and second primaries is less than approximately 31 degrees.

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