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Reflectance control of an electrochromic element using a variable duty cycle drive

  • US 6,084,700 A
  • Filed: 04/29/1998
  • Issued: 07/04/2000
  • Est. Priority Date: 04/29/1998
  • Status: Expired due to Term
First Claim
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1. A drive circuit for driving an electrochromic element, the drive circuit comprising:

  • means for generating a modulated signal having a variable duty cycle defining a low logic state during each cycle and a high logic state during each cycle; and

    means for driving said electrochromic element with said modulated signal when said modulated signal is in one or the other of said logic states and shorting said electrochromic element when said modulated signal is in the other of said logic states irrespective of the voltage of said electrochromic element.

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