Patent ID: 8203286
Filing Date: 2012-06-19
Classification: G09G,H05B

Abstract:
1. A lighting panel system, comprising: a lighting panel including a first string of solid state lighting devices configured to emit red light, a second string of solid state lighting devices configured to emit green light, and a third string of solid state lighting devices configured to emit blue light; at least three current supply circuits coupled to the first, second and third strings, respectively, wherein each of the current supply circuits comprises a variable voltage boost, constant current power supply circuit configured to operate in continuous current mode; and a pulse width modulation (PWM) controller that is coupled to the current supply circuits and that is configured to generate, for ones of the current supply circuits, a first PWM control signal that corresponds to a voltage boost and a second PWM control signal that corresponds to an on-state drive current that is supplied to the first, second and third strings, respectively, wherein the PWM controller comprises a closed loop digital control system that is configured to generate the first PWM control signal and/or the second PWM control signal in response to sensor output signals generated by at least one light sensor in response to light output by the lighting panel.