Patent ID: 9674911
Date: 2017-06-06
CPC Classifications: G09G,H05B

Claim:
1. A system, comprising: a light-emitting diode (LED); a switch in series with the LED and configured to control a current through the LED responsive to the switch cycling on and off such that the current flows through the LED while the switch is on and such that the current is stopped while the switch is off; and a pulse width modulation (PWM) controller configured to generate a plurality of pulses responsive to a corresponding plurality of cycles of a synchronization clock to control the cycling of the switch, each pulse having a pulse width, wherein the PWM controller is further configured to generate each pulse responsive to a target time defined with regard to a reference time in the corresponding cycle of the synchronization clock such that the pulse has a leading portion of the pulse width that precedes its target time and such that the pulse has a trailing portion of the pulse width subsequent to its target time, and wherein the PWM controller is further configured to change the leading portion by a percentage of the pulse width across successive pulses in a first subset of the plurality of pulses.