Display for automatic rearview mirror

  • US 5,530,240 A
  • Filed: 04/21/1995
  • Issued: 06/25/1996
  • Est. Priority Date: 12/15/1992
  • Status: Expired due to Term
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First Claim
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1. A rearview mirror system for a vehicle comprising:

  • a mirror reflective element including a reflectance surface and an electrochromic variable light transmission element;

    said mirror reflectance element being one of a compass mirror and an information mirror;

    said mirror reflectance surface having a portion that is at least partially light transmitting;

    a drive circuit for supplying a drive signal to said reflective element in order to establish the light transmission level of said light transmission element;

    a display device behind said reflective element that produces an alphanumerical display having an intensity level wherein the intensity level of said alphanumerical display is variable by varying the duty cycle of a blanking signal applied to said display device, wherein said blanking signal has a repetition rate greater than 200 Hz; and

    said display device being juxtaposed with said at least partially transmitting portion of said reflectance surface and adapted to be viewed through said light transmission element and said at least partially transmitting portion of said reflectance surface.

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