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Electrochromic contrast-plate

  • US 6,344,918 B1
  • Filed: 04/14/1999
  • Issued: 02/05/2002
  • Est. Priority Date: 03/29/1999
  • Status: Expired due to Fees
First Claim
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1. An electrochromic contrast plate comprising:

  • (a) a pair of transparent glass or plastic sheets that are each provided on one side with an electroconductive, transparent coating and that are joined together at the sides of their conductive coating via a sealing ring, (b) a volume formed by the pair of sheets and the sealing ring, and (c) an electrochromic medium that is a liquid, a gel or a polymer and that fills in the volume, which upon application of a voltage produces a uniform grey coloration in a C.I.E. triangle so that color coordinates (x,y) of dyes in the electrochromic medium are between 0.3 and 0.37 in the C.I.E. triangle.

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