Digital electrochromic mirror system

  • US 6,406,152 B1
  • Filed: 10/09/2001
  • Issued: 06/18/2002
  • Est. Priority Date: 04/02/1997
  • Status: Expired due to Term
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First Claim
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1. A vehicular electrochromic rearview mirror system, comprising:

  • an electrochromic rearview mirror assembly, said electrochromic rearview mirror assembly including 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, said control circuit comprising a digital controller, said digital controller including a microcomputer;

    said control circuit establishing said partial reflectance level of said electrochromic mirror assembly as a function of a duty cycle of a pulse-width modulation signal of said digital controller;

    said digital controller receiving an input from at least one light sensor responsive to ambient light conditions around the vehicle;

    said mirror assembly including an information display, said microcomputer of said digital controller controlling the intensity of said display as a function of the ambient light conditions around the vehicle;

    said mirror assembly further including at least one accessory selected from the group comprising a headlamp controller, a video camera, a rain sensor, a microphone and a telephone; and

    wherein said at least one accessory shares at least one of;

    A) a component with said control circuit and B) circuitry with said control circuit.

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