Patent ID: 8890417

Claim:
A light emitting diode (LED) backlight driving circuit, comprising: an LED lightbar; a constant current chip that controls current flowing through the LED lightbar; and a comparison module that receives an output voltage of the LED lightbar; when the output voltage of the LED lightbar is greater than a reference voltage, the comparison module controls the constant current chip to switch off the current of the LED lightbar; wherein a non-inverting input end of the comparator is connected to the reference voltage, and an inverting input end of the comparator is coupled to the output end of the LED lightbar; when the output voltage of the LED lightbar is greater than the reference voltage, the comparator outputs a low level signal to an enable control end of the constant current chip to control the constant current chip to switch off the current of the LED lightbar; a first resistor and a second resistor are connected in series between an operation power source end of the constant current chip and a grounding end of the LED backlight driving circuit in sequence, and voltage of the second resistor is coupled to the non-inverting input end of the comparator; the second resistor is an adjustable resistor.