Digital electrochromic mirror system

  • US 6,595,649 B2
  • Filed: 10/31/2002
  • Issued: 07/22/2003
  • Est. Priority Date: 04/02/1997
  • Status: Expired due to Fees
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First Claim
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1. A vehicular electrochromic rearview mirror system, comprising:

  • at least one electrochromic rearview mirror assembly having an electrochromic reflective element, said electrochromic reflective element assuming a partial reflectance level in response to a signal applied thereto;

    a control circuit applying a drive signal to said electrochromic reflective element establishing a partial reflectance level thereof;

    a temperature sensor for sensing a temperature at the vehicle; and

    wherein said control circuit establishes the partial reflectance level as a function of a duty cycle of a pulse-width modulation signal, the duty cycle of the pulse-width modulation signal being a function at least of the temperature sensed with said temperature sensor.

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