An image signal line driver circuit includes first to third source drivers and fourth to sixth source drivers, which are respectively cascade-connected. The output duration of data signals that are provide to these source drivers is increasingly short on the source drivers that are connected further downstream (that is, the amount of pixel data to be output to the next stage is increasingly small). This reduces the power consumption and heat generation of the overall device. Moreover, the phases of the data signals are shifted, thereby reducing EMI. In this way, when a plurality of image signal line driver circuits are cascade-connected, heat generation and power consumption in each driver circuit and/or EMI therebetween is reduced.