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Electronic device with display and low-noise ambient light sensor with a control circuitry that periodically disables the display

  • US 8,987,652 B2
  • Filed: 01/10/2013
  • Issued: 03/24/2015
  • Est. Priority Date: 12/13/2012
  • Status: Active Grant
First Claim
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1. A method of gathering ambient light sensor data in an electronic device having a display, an ambient light sensor, and control circuitry with an integrating analog-to-digital converter, wherein the integrating analog-to-digital converter has an integrating input and wherein the control circuitry has transistor circuitry coupled between the integrating input and the ambient light sensor, the method comprising:

  • with the control circuitry, disabling the display for sample periods and enabling the display for hold periods that are interspersed among the sample periods; and

    during a first set of the sample periods, providing signals from the ambient light sensor to the integrating input through the transistor circuitry;

    during a second set of the sample periods, using the transistor circuitry to prevent signals from the ambient light sensor from reaching the integrating input; and

    with the control circuitry, producing an ambient light sensor signal using data gathered by the integrating analog-to-digital converter during the second set of sample periods and the data gathered by the integrating analog-to-digital converter during the first set of sample periods.

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