Patent ID: 8569976

Claim:
A method of providing power to a series of light-emitting diodes in a plurality of series of light-emitting diodes, the method comprising: generating an input DC current having an average current; determining the average current of the input DC current based on a plurality of corresponding input DC currents through the plurality of series of light-emitting diodes; determining a total period for switching the input DC current to all of the series of light-emitting diodes in the plurality of series of light-emitting diodes; determining a corresponding period of time for switching the input DC current to a selected corresponding series of light-emitting diodes based on a ratio of the corresponding input DC current for the selected corresponding series of light-emitting diodes to the average current; and sequentially and separately switching the input DC current to each of the series of light-emitting diodes in the plurality of series of light-emitting diodes for the determined corresponding period of time.