LED backlight driving circuit and LCD device

Abstract

A light emitting diode (LED) backlight driving circuit includes a power supply module. A controllable switch and a voltage dividing resistor module are successively connected in series between an output end of the power supply module and a grounding end of the LED backlight driving circuit. A control end of the controllable switch is coupled with a power management chip. The LED backlight driving circuit further includes a first resistor and a current regulation module, an output current of the current regulation module is regulable. One end of the first resistor is connected between the controllable switch and the voltage dividing resistor module, and another end of the first resistor is connected with a first reference voltage, the first reference voltage is constant. An output end of the current regulation module is coupled between the first resistor and the first reference voltage. In summary, brightness regulation of the LED lightbar may be independently accomplished without use of the power management chip.

Dependencies are inferred from the claim text.