BACK LIGHT DRIVING CIRCUIT FOR LCD PANEL

摘要

A back light driving circuit of an LCD(Liquid Crystal Display) panel is provided to apply a soft start mode, thereby generating no noise by preventing inrush current from being generated in a coil of a converter circuit when initial power is applied. A signal generator(1) is turned on/off by an on/off signal of an input terminal, and generates a high frequency pulse type gate signal whose pulse width increases according to a level of inputted output current. A voltage boosting circuit(2) is for boosting voltage by the connection to an output terminal of the signal generator. A load unit(3) is connected to the voltage boosting unit and loads boosted voltage. A feedback block(4) senses an output current level by the connection to an output terminal of an LED(Light Emitting Diode) of the load unit and supplies power having the output current level to a PWM IC(Pulse Width Modulation Integrated Circuit). A converter(5) is serially connected to the feedback block and converts the output current level into a voltage level. An output current level recognizing terminal of the signal generator is connected to the converter. A noise reducing unit(10) is coupled between the input terminal of the signal generator and the converter.