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Anti-glare rearview mirror assembly and reflectance control method of same

  • US 6,974,940 B2
  • Filed: 01/23/2003
  • Issued: 12/13/2005
  • Est. Priority Date: 11/21/2002
  • Status: Expired due to Fees
First Claim
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1. A monitoring assembly for use in a vehicle, comprising:

  • a monitor device changing the reflectance thereof in response to a control signal;

    a first light sensor for receiving a first light from a first specified range, and outputting a first signal in response to the intensity of said first light;

    a second light sensor for receiving a second light from a second specified range partially overlapping with said first specified range, and outputting a second signal in response to the intensity of said second light; and

    a comparative controller in communication with said first light sensor and said second light sensor, receiving and operating said first signal and said second signals to obtain a first result, and asserting said control signal to adjust the reflectance of said monitor device according to said first result, wherein said comparative controller includes a comparator receiving said first signal and said second signal, comparing said first signal at a first time point and said first signal at a second time point to obtain a first light variation, comparing said second signal at said first time point and said second signal at said second time point to obtain a second light variation, and further comparing said first signal and said second signal at said second time point to obtain a light difference on a condition that said first light variation or said second light variation exceeds a first threshold value.

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