Display device and method thereof

A display device comprising:

• a plurality of pixels to which a common voltage is applied, the common voltage being a periodic signal comprising a first common voltage and a second common voltage that is lower than the first common voltage;
• and
• a driving voltage generator which generates first and second voltages from a received basic voltage, generates the first common voltage based on the basic voltage and the second voltage, and generates the second common voltage based on the basic voltage and the first voltage,
• wherein the driving voltage generator comprises a voltage distribution unit which divides the basic voltage and outputs first and second reference voltages, a first output unit which amplifies the first reference voltage and generates the first common voltage, and a second output unit which outputs the second common voltage based on the second reference voltage, and
• the first output unit comprises an operation amplifier connected to a first power source, and the second voltage is applied to the first power source.