Patent ID: 8299987
Filing Date: 2012-10-30
Classification: H05B,Y02B

Abstract:
1. Apparatus for controlling a set of light emitting diodes (LEDs) comprising: at least one current source for powering said set of LEDs; and at least one controller for controlling said at least one current source via LED control information; wherein over a portion of a range of dimming intensity levels from 0% to 25%, said LED control information includes individual on times and off times and period for each dimming intensity level, the individual period composed of the sum of on time and off time for the associated dimming intensity level, whereby each individual on time is used to construct a single pulse; wherein over a portion of the range of dimming intensity levels from 0% to 25%, the individual on and off times, the sum of on time and off time, and period are all variable and not held constant; wherein over a portion of the range of dimming intensity levels from 0 to 25%, for consecutive dimming intensity levels, the change in desired intensity is less than 3%.