Thin-film coatings, electro-optic elements and assemblies incorporating these elements

  • US 8,274,729 B2
  • Filed: 06/21/2010
  • Issued: 09/25/2012
  • Est. Priority Date: 03/03/2006
  • Status: Active Grant
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First Claim
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1. A mirror system for use in a vehicular rearview assembly equipped with a light source configured to generate light that is transmitted from within the rearview assembly through said mirror system to a field of view (FOV) outside the assembly, the generated light having a generated spectrum, the mirror system comprising an electrochromic (EC) element, the EC-element including:

  • a first substantially transparent substrate having first and second surfaces, the second surface including a transparent electrode carried thereon, the first substrate corresponding to an outside portion of said assembly;

    a second substrate having third and fourth surfaces, the second and first substrates being mutually secured in a parallel and space-apart relationship thereby defining a gap between the second and third surfaces, the third surface having a spectrally-selective transflective thin-film stack carried thereon, said spectrally-selective transflective stack having a multi-band transmission spectrum;

    a seal sealably bonding the second and third surfaces, wherein said spectrally-selective transflective stack is extended beyond the seal towards a perimeter of the second substrate and is configured to make the seal visible from the fourth surface; and

    an electrochromic medium inside said gap,wherein said mirror system is characterized by a C* value not exceeding 20, as measured in light produced by a standard D65 illuminant and reflected by said mirror system.

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