A display device including multiple displays is provided. The display device includes a first display including first pixels; a second display including second pixels; a first driver configured to drive the first display; a second driver configured to drive the second display; a controller configured to control the first and second drivers; a first power supply configured to supply first power to the first and second displays; and a second power supply configured to supply second power to the first and second displays. The second power supply includes a first voltage source configured to generate a first voltage; a second voltage source configured to generate a second voltage; a first switch configured to couple the first display to any one of the first and second voltage sources; and a second switch configured to couple the second display to one of the first and second voltage sources.