Patent ID: 8289305

Claim:
A liquid crystal display device comprising: a liquid crystal panel; a point light source which emits light to the liquid crystal panel; and a light source driver comprising: a power input terminal which receives an initial power, a power supply which includes a first output terminal and a second output terminal and supplies power through the first and second output terminals to the point light source according to the initial power and a reference current, the first output terminal being directly connected to the power input terminal, and the point light source being connected between the first output terminal and the second output terminal, and a reference current controller which detects change of a voltage level of the initial power without receiving a feedback of the power supplied by the power supply to the point light source and outputs the reference current according to the change of the voltage level of the initial power, to the power supply, wherein the power supply comprises: a switching element which switches a current output to the point light source, an inductor connected between the switching element and the second output terminal, and a switching controller which is directly connected to the power input terminal, receives the reference current output from the reference current controller and turns the switching element on and off according to the reference current received from the reference current controller, a pulse width modulation (PWM) dimming signal input from the outside, and a current flowing in the inductor connected between the switching element and the second output terminal.