A display device capable of switching over between vertical and horizontal display on a screen without using a frame memory is provided. A display device has a source signal line driver circuit (102), a first gate signal line driver circuit (103), and a second gate signal line driver circuit (104). The scanning direction of the first gate signal line driver circuit (103) is perpendicular to the scanning direction of the source signal line driver circuit (102), and the scanning direction of the second gate signal line driver circuit (104) is perpendicular to the scanning direction of the first gate signal line driver circuit (103). During normal display, vertical scanning of the screen is performed by the first gate signal line driver circuit (103). Images are displayed in a direction that is in accordance with the scanning direction of the first gate signal line driver circuit (103). On the other hand, vertical scanning of the screen is performed by the second gate signal line driver circuit (104) when switching over between vertical and horizontal display. Images are displayed in a direction that is in accordance with the scanning direction of the second gate signal line driver circuit (104).