Patent ID: 9672775
Date: 2017-06-06
CPC Classifications: G09G,H05B

Claim:
1. A method for driving a backlight driver of a liquid crystal display device, the method comprising: generating and outputting an output vertical synchronization signal which is synchronized based on change of an input period of an input vertical synchronization signal; generating internal clocks based on an output period of the output vertical synchronization signal; and generating a pulse width modulation signal having a predetermined duty ratio using the internal clocks to drive a backlight unit, wherein the generating and outputting the output vertical synchronization signal comprises: generating the output vertical synchronization signal whose output period is set based on a comparison result between an input period of the input vertical synchronization signal and a previous output period of the output vertical synchronization signal, wherein the output period of the output synchronization signal is set as a sum of the input period of the input synchronization signal and a difference between an input period of an input synchronization signal and a previous output period of the output synchronization signal; and limiting and outputting the output period of the output vertical synchronization signal within a predefined limit range from the previous output period.