FIELD: electronic equipment.
SUBSTANCE: invention relates to a technology for manufacturing liquid crystal displays providing a led backlight driving circuit and an over-current protection circuit. Over-current protection circuit includes a boost circuit, a voltage control module and an over-current protection module. Boost circuit boosts an input direct current voltage to a boosted DC voltage and for providing the boosted DC voltage to a load. Voltage control module controls the boost circuit to provide the boosted DC voltage to the load such that the load is driven by a constant current. Over-current protection module generates first control signals or second control signals according to an over-current protection voltage detected by the boost circuit. First control signals are for controlling the voltage control module to operate normally, and the second control signals are for stopping operations of the voltage control module. LED backlight driving circuit and the liquid crystal device incorporating the above over-current protection circuit are also disclosed.
EFFECT: technical result is increased reliability of the protection circuit.
11 cl, 4 dwg
