Circuit and method of driving light emitting diodes

摘要

An LED drive method is disclosed. In this way, the LED drive method allows not only the reference voltage to be periodically updated on the basis of the feedback drive voltages but also the drive voltage control signal to be generated using the updated reference voltage, in order to adjust the LED drive voltage applied to the LED array. Therefore, the LED drive circuit is hardly affected by the external environmental noise.

主权项

1. A light-emitting diode drive circuit comprising:
a light-emitting diode array configured to include light-emitting diode strings which each include a plurality of serially connected light-emitting diodes; a power supplier configured to apply a drive voltage to the light-emitting diode array; current drivers connected to the respective light-emitting diode strings and configured to control current signals flowing along the respective light-emitting diode strings in response to a first control signal including light-emitting diode current information; and a main controller configured to irregularly input each feedback drive voltage from the light-emitting diode strings and generate a second control signal which is used to adjust to the drive voltage applied from the power supplier to the light-emitting diode array.