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Brightness control of a status indicator light

  • US 8,653,745 B2
  • Filed: 06/21/2010
  • Issued: 02/18/2014
  • Est. Priority Date: 11/09/2006
  • Status: Active Grant
First Claim
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1. A method for varying a luminance of a light, comprising:

  • determining a target change in a signal, the signal setting the luminance of the light, the luminance of the light having a minimum luminance level and a maximum luminance level;

    determining if the target change is less than a maximum allowed change for the signal;

    if the determination that the target change is less than a maximum allowed change is positive, limiting a change in the signal to the target;

    orif the determination that the target change is less than a maximum allowed change is negative, limiting the change in the signal to the maximum allowed change for the signal thereby limiting a rate of change in the luminance of the light;

    determining a target luminance to be reached by the luminance of the light, wherein the target luminance level is determined at least in part based on a change in ambient light levels;

    determining a minimum time to reach the target luminance;

    setting a minimum number of timer ticks necessary to vary the luminance from an initial luminance to the target luminance; and

    changing the luminance of the light from the initial luminance to the target luminance in a number of timer ticks at least equal to the minimum number of timer ticks.

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