LED backlight driving circuit, backlight module, and LCD device

A backlight module, comprising:

• a light emitting diode (LED) backlight driving circuit comprising a light emitting diode (LED) lightbar;
• wherein an output end of the light emitting diode (LED) lightbar is connected with a control integrated circuit (IC) in series, and is also connected with a shunt controllable switch;
• wherein the shunt controllable switch is switched on when a voltage of the output end of the light emitting diode (LED) lightbar exceeds a preset value and is switched off when the voltage is less than the preset value;
• and
• wherein a control end of the shunt controllable switch is connected with an OP module;
• a feedback resistor is connected in series between an output end of the shunt controllable switch and a power grounding terminal;
• a first input end of the OP module is coupled to the output end of the LED lightbar;
• and a second input end of the OP module is coupled between the shunt controllable switch and the feedback resistor.

A liquid crystal display (LCD) device, comprising:

• a backlight module comprising a light emitting diode (LED) backlight driving circuit comprising a light emitting diode (LED) lightbar;
• wherein an output end of the light emitting diode (LED) lightbar is connected with a control integrated circuit (IC) in series, and is also connected with a shunt controllable switch;
• wherein the shunt controllable switch is switched on when a voltage of the output end of the light emitting diode (LED) lightbar exceeds a preset value and is switched off when the voltage is less than the preset value;
• wherein a control end of the shunt controllable switch is connected with an OP module;
• an output end of the shunt controllable switch is connected with a feedback resistor in series;
• a first input end of the OP module is coupled with the output end of the LED lightbar through a diode;
• an anode of the diode is coupled to the first input end of the OP module, and a cathode of the diode is coupled to the output end of the LED lightbar;
• a voltage collecting resistor is also connected in series between the first input end of the OP module and a power grounding terminal;
• a voltage dividing resistor is connected in series between the output end of the LED lightbar and the shunt controllable switch;
• there are a plurality of the voltage dividing resistors;
• and the voltage dividing resistors are connected in parallel.