Patent ID: 8854293
Filing Date: 2014-10-07
Classification: G09G,H05B

Abstract:
1. An apparatus for driving a light source of a backlight unit, comprising: a plurality of LED columns; and an LED driver including a power output terminal and a plurality of feedback terminal connected to the LED columns, the LED driver driving the LEDs sequentially according to the sequentially delayed PWM signals, wherein the LED driver decides an operable number of LED channels based on the signals input through the feedback terminals, and sequentially delays the PWM signals with a phase difference controlled by the number of LED channels, wherein the LED driver comprises: wherein the PWM controller controls the duty ratio of PWM signals to overlap each other to increase the luminescence of the light, wherein the driving voltage generator increases the LED driving voltage as the operable number of LED channels detected by the feedback voltage detector is increased and decreases the LED driving voltage as the operable number of LED channels detected by the feedback voltage detector is decreased, and wherein a feedback terminal not connected to the LED columns is connected to a ground through a resistor.