Automatic electrochromic control of light level of vacuum fluorescent display

  • US 5,883,605 A
  • Filed: 03/08/1996
  • Issued: 03/16/1999
  • Est. Priority Date: 02/25/1992
  • Status: Expired due to Term
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First Claim
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1. An electronic control system for controlling the reflective state of an automatic rearview mirror for an automotive vehicle, said system including a rearview mirror comprising an electro-optic variable reflectance mirror element the reflectivity of which varies over a reflectance range as a function of electrical signals applied thereto, said rearview mirror also including a variable luminance light emitting display visible through said electro-optic variable reflectance mirror element, ambient light sensing means effective to sense ambient light levels and to generate an electrical signal indicative of the ambient light level, glare light sensing means effective to sense glare-causing light levels and generate an electrical signal indicative of the glare-causing light level, means responsive to said electrical signals to control both the reflective state of said mirror element and the luminance of said light emitting display whereby the luminance of said display increases as the reflectivity of said electro-optic variable reflectance mirror element decreases and the luminance of said display decreases as the reflectivity of said mirror element increases, and means operable to vary the luminance of said light emitting display directly as a function of the electrical signal indicative of the ambient light level.

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