A display device includes a display panel driver and a DC-DC converter. The display panel driver divides one frame into a plurality of periods and outputs a control signal to generate an analog supply voltage, a first power voltage, and a second power voltage for driving pixels. The DC-DC converter receives the control signal from the display panel driver through a single wire. The DC-DC converter includes an analog supply voltage generator, a first power voltage generator, and a second power voltage generator. The analog supply voltage generator generates the analog supply voltage during a first pulse period. The first power voltage generator generates the first power voltage during a second pulse period. The second power voltage generator generates the second power voltage during the third pulse period.