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Counter electrode arrangement of an electrochromic display device

  • US 4,256,380 A
  • Filed: 09/20/1979
  • Issued: 03/17/1981
  • Est. Priority Date: 12/20/1978
  • Status: Expired due to Term
First Claim
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1. An electrochromic display device having at least one display electrode comprisingan electrolyte associated with the display electrode,a counter electrode in contact with said electrolyte that is maintained charged to a given potential during operation,a donor electrode for transferring a charge to said counter electrode during operation,a reference electrode for sensing the potential of said counter electrode during operation, andelectric circuit means responsive to the potential sensed by said reference electrode to cause said donor electrode to transfer charge to said counter electrode so as to maintain said counter electrode at the given potential.

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