A timing controller includes: a top voltage generator configured to output first to third top voltages; a bottom voltage generator configured to output first to third bottom voltages; a first transmitting part configured to output a first data signal for a first data driving chip, based on the first top and bottom voltages; a second transmitting part configured to output a second data signal for a second data driving chip based on the second top and bottom voltages; and a third transmitting part configured to output a third data signal for a third data driving chip based on the third top and bottom voltages, where one of the first to third top voltages is different from another of the first to third top voltages, and one of the first to third bottom voltages is different from another of the first to third bottom voltages.