Patent ID: 8599183

Claim:
A liquid crystal display comprising: a liquid crystal display panel configured to display a picture corresponding to a data; a DC-DC converter configured to generate driving voltages necessary for driving the liquid crystal display panel; a system configured to supply the data, a module operation power and a backlight operation power in a play state, and cutting off at least one of the module operation power and the backlight operation power while supplying the data in a pause state; a switching circuit configured to output a first voltage depending on whether or not the module operation power and the backlight operation power from the system are supplied; and a backlight driving circuit that directly receives the backlight operation power from the system and generates a backlight driving signal for driving a backlight unit irradiating light on the liquid crystal display panel, wherein the switching circuit includes: a resistor; a first switching element having one terminal connected to one end of the resistor, another terminal connected to a ground, and a control terminal directly connected to a first power supplying line to which the module operation power from the system is supplied, and a second switching element having one terminal connected to a second power supplying line to which the backlight operation power from the system is supplied, another terminal connected to an input terminal of the DC-DC converter, and a control terminal connected to another end of the resistor, wherein the first and second switching elements are turned-on to supply an input voltage necessary for operating the DC-DC converter to the input terminal of the DC-DC converter during which the module operation power and the backlight operation power are supplied, and the first and second switching elements are turned-off to not supply the input voltage to the input terminal of the DC-DC converter during which any one of the module operation power and the backlight operation power is supplied, wherein the module operation power is directly supplied to the switching circuit, a gate driving circuit and a data driving circuit for driving the liquid crystal display panel, and a timing controller for controlling an operating timing of the display panel driving circuit, and the backlight operation power is supplied to the switching circuit and a backlight driving circuit.