DISPLAY DEVICE

The invention provides a display device which can effectively use functions of a slave mode image-signal-line drive circuit and receive and display a plurality of input signals. Each of image-signal-line drive circuits (11, 12) includes a timing controller (25) that generates a control signal controlling itself and other image-signal-line drive circuit, and a master/slave selection circuit (42) that sets itself as a master mode image-signal-line drive circuit or a slave mode image-signal-line drive circuit based on a selection signal (SL) to be given from outside. From among the plurality of image-signal-line drive circuits, the master mode image-signal-line drive circuit gives the control signal to the slave mode image-signal-line drive circuit.