Exemplary embodiments of the present invention relate to a power supply of a display device that includes a driving circuit and a display panel that displays an image according to an output data voltage transmitted from the driving circuit. The power supply includes a first booster and a second booster provided in the driving circuit, the first booster generates a first output voltage supplied to an Op-amp of a source output circuit of the driving circuit, and the second booster generates a second output voltage supplied to buffers of the source output circuit of the driving circuit.