Method for maintaining the electrochromic activity of an electrochromic material

  • US 4,960,323 A
  • Filed: 10/05/1988
  • Issued: 10/02/1990
  • Est. Priority Date: 10/05/1988
  • Status: Expired due to Fees
First Claim
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1. A method of maintaining the electrochromic activity of a cathodic electrochromic material having a non-stoichiometric composition provided between electrodes of an electrochromic device, which method comprises:

  • applying a voltage, at least during operation of said device, across said electrodes of such level that the absolute value of an applied negative voltage is greater than the absolute value of an applied positive voltage, so as to continuously maintain a negative charge abundance in said electrochromic material sufficient to keep said electrochromic material in a non-stoichiometric state and whereby oxidation of said electrochromic material is substantially prevented.

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