Led backlight driving circuit and lcd device

A light crystal display (LCD) device, comprising:

• a light emitting diode (LED) backlight driving circuit;
• wherein the LED backlight driving circuit comprises 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;
• wherein the LED backlight driving circuit further comprises 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.