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Electrochromic display device

  • US 4,304,465 A
  • Filed: 10/29/1979
  • Issued: 12/08/1981
  • Est. Priority Date: 10/29/1979
  • Status: Expired due to Term
First Claim
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1. An electrochromic display device comprisinga hollow panel enclosing an electrolyte and having a first transparent face and a second face,a counter electrode located on the inner surface of said transparent face,a display electrode on the inner surface of said second face, anda polymer film of a polypyrrole on said display electrode wherein varying the potential of said display electrode causes said polymer film to change in color and transparency.

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