DEVICE OF DRIVING BACKLIGHT ASSEMBLY, DISPLAY APPARATUS HAVING THE SAME AND METHOD OF DRIVING BACKLIGHT ASSEMBLY

摘要

A backlight driver, a display device having the backlight driver and a method of driving a backlight unit are provided to increase the amplitude of a pulse width modulation signal when a dimming signal which represents the duty ratio of the pulse width modulation signal is smaller than a predetermined reference duty ratio so as to improve a response speed in the control of the brightness of backlight. A backlight assembly includes an inverter controller(110), a dimming signal compensator(120) and an inverter(130). The inverter controller generates a pulse width modulation signal in response to an external control signal and outputs a first dimming signal representing the duty ratio of the pulse width modulation signal and a second dimming signal representing the amplitude of the pulse width modulation signal. The dimming signal compensator receives the first and second dimming signals, compares the first dimming signal with a predetermined reference duty ratio and compensates the second dimming signal according to the comparison result to generate a third dimming signal. The inverter receives a power supply voltage, transforms the power supply voltage into a driving voltage, supplies the driving voltage to a backlight(140) and varies the level of the driving voltage in response to the first, second and third dimming signals to control the brightness of the backlight.