Liquid crystal display device

A liquid crystal display device comprising:

• a liquid crystal display panel;
• a backlight which includes at least one light emitting diode;
• a main voltage step-up circuit which steps up a power supply voltage, and applies the stepped up voltage to the at least one light emitting diode;
• a main control circuit which controls and drives the main voltage step-up circuit;
• and
• an auxiliary voltage step-up circuit,
• wherein the main voltage step-up circuit includes
• a coil of which one end is connected to a power supply;
• a main switching element which is connected between the other end of the coil and a ground potential, and which ON/OFF thereof is controlled by the main control circuit;
• a diode which is connected to the other end of the coil;
• and
• a smoothing capacitor which is connected to the diode, the smoothing capacitor being a ceramic capacitor,
• wherein the auxiliary voltage step-up circuit is connected to the other end of the coil,
• the auxiliary voltage step-up circuit is ON when the main step-up voltage circuit is OFF, and compensates a potential change in the smoothing capacitor is included, and
• wherein the auxiliary voltage step-up circuit includes
• an auxiliary switching element which is connected between the other end of the coil and a ground potential;
• and
• an auxiliary control circuit which controls ON/OFF of the auxiliary switching element.