Patent ID: 7872621
Filing Date: 2011-01-18
Classification: G09G,H05B

Abstract:
1. A color LED driver, comprising: a driving constant voltage source for supplying a predetermined driving constant voltage; a driving circuit for converting the driving constant voltage of the driving constant voltage source into a plurality of driving currents, for driving color LEDs, the plurality of driving currents including red LED driving current, green LED driving current and blue LED driving current; a temperature compensation unit for compensating variations in the red LED driving current and the green LED driving current due to a variation in a temperature, among the plurality of driving currents from the driving circuit; and an LED unit including a plurality of color LEDs which are turned on by the driving currents from the temperature compensation circuit and the driving current from the driving circuit, wherein the temperature compensation unit comprises: a first temperature compensation circuit including a first NTC thermistor for compensating the red LED driving current according to the variation in the temperature and a first linear compensation resistor which is connected to the first NTC thermistor in parallel, for compensating linearity of the red LED driving current; and a second temperature compensation circuit including a second NTC thermistor for compensating the green LED driving current according to the variation in the temperature and a second linear compensation resistor which is connected to the second NTC thermistor in parallel, for compensating linearity of the green LED driving current.