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Ambient light sensor with reduced sensitivity to noise from infrared sources

  • US 8,779,345 B2
  • Filed: 11/15/2011
  • Issued: 07/15/2014
  • Est. Priority Date: 09/25/2008
  • Status: Active Grant
First Claim
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1. A method for controlling an electronic device comprising:

  • detecting a first intensity of all light at substantially any wavelength at a first time;

    detecting a first intensity of infrared light over near-infrared wavelengths at the first time;

    determining a first intensity of visible light based on a difference between the detected first intensity of all light and the detected first intensity of infrared light;

    detecting a second intensity of all light at substantially any wavelength at a second time that is after the first time;

    detecting a second intensity of infrared light over near-infrared wavelengths at the second time;

    determining a second intensity of visible light based on a difference between the detected second intensity of all light and the detected second intensity of infrared light;

    when the detected second intensity of infrared light is above a threshold intensity, generating a first control signal for controlling the electronic device based on the determined first intensity of visible light; and

    when the detected second intensity of infrared light is below the threshold intensity, generating a second control signal for controlling the electronic device based on the determined second intensity of visible light.

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