LED BACKLIGHT FOR LCD DISPLAY DEVICE AND LCD DISPLAY APPARATUS Russian patent published in 2018 - IPC G09G3/34 

FIELD: lighting engineering; imaging devices.

SUBSTANCE: invention relates to LED backlight sources used in an LCD display device. In the method, the device includes a voltage boosting circuit that increases the input voltage to the operational voltage of the LED string, the current control module connected to the negative output of the LED string, the microcontroller that supplies the second square wave signal to the current control module, in order to control the current control module to perform current modulation, the voltage boost driver chip supplying the first square wave signal to the voltage boost circuit so that the voltage boost circuit performs the voltage boost function, at the same time, the boost driver chip receives the feedback control voltage found by the microcontroller and changes the turn-on time of the first square wave supplied by the booster circuit based on the feedback control voltage.

EFFECT: technical result is to increase the speed of modulating the operating voltage of the LED string.

10 cl, 3 dwg