LED BACKLIGHT SOURCE FOR LIQUID CRYSTAL DISPLAY DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

An LED backlight source for a liquid crystal display device, comprising: a booster circuit (110) configured to boost a input voltage to a working voltage of an LED series (150); a current control module (120) configured to be connected to the negative terminal of the LED series (150) to regulate the working current of the LED series (150); a microcontroller (130) configured to provide a second square wave signal for the current control module (120) to enable the current control module (120) to realize a current regulation function, and further configured to search for a feedback regulating voltage in a lookup table according to the working current of the LED series (150); a booster drive chip (140) configured to provide a first square wave signal for the booster circuit (110) to enable the booster circuit (110) to realize a boost function. The feedback regulating voltage obtained by the microcontroller (130) is received, and the duty ratio of the first square wave signal provided for the booster circuit (110) is changed according to the received feedback regulating voltage, so as to change the working voltage of the LED series (150).