A display device including voltage lines to transfer a power voltage is disclosed. One inventive aspect includes a display panel, a data driver formed on the display panel, a printed circuit board supplying a voltage to the data driver, and voltage lines connecting the data driver to the printed circuit board. The voltage lines further includes a first voltage line transferring a first power voltage, a second voltage line transferring the first power voltage or a second power voltage, a third voltage line transferring the second power voltage or a third power voltage, and a fourth voltage line transferring the third power voltage.