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Electrochromic display device

  • US 4,252,418 A
  • Filed: 10/23/1978
  • Issued: 02/24/1981
  • Est. Priority Date: 03/31/1978
  • Status: Expired due to Term
First Claim
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1. An electrochromic display device comprisingan active electrochromic material which includes heptyl viologen cations and which can undergo a reversible reduction/oxidation reaction, said material having a bulk concentration of 0.1 molar of heptyl viologen,at least one display electrode having a rough surface thereon in contact with said material wherein a rough surface is defined as an average height to base roughness (h/l, FIG. 2) of 4 and where an average peak-to-peak distance of the protruberances of the rough surface is greater than 4μ

  • , andmeans to supply current to said electrode to a density such that the bulk concentration interface (Y, FIG.

         2) of said material conforms to the contour of the rough surface of said electrode during the deposition of colored species onto said electrode, said current density being 0.6 A/cm2.

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