Digital electrochromic mirror system

  • US 20020030891A1
  • Filed: 09/12/2001
  • Published: 03/14/2002
  • Est. Priority Date: 04/02/1997
  • Status: Active Grant
First Claim
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1. An electrochromic rearview mirror assembly for a vehicle, comprising:

  • an electrochromic reflective element having an electrochromic cell, wherein said reflective element colors to a partial reflectance level in response to a drive signal applied to said electrochromic cell; and

    a drive circuit which applies a pulsed drive signal to said electrochromic cell in order to establish said partial reflectance level of said reflective element, said drive circuit controlling said partial reflectance level at least as a function of the duty cycle of said pulsed drive signal.

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