An object of an embodiment of the present invention is to suppress the occurrence of an afterimage on a display screen. In a period (A1) within a single frame period, a gate driver outputs a gate voltage (Vgh) to a gate line (GL1), and in a period (B1) coming after the period (A1) within the single frame period and also longer than the period (A1), the gate driver outputs the gate voltage (Vgh) to the gate line (GL1). In both the period (A1) and the period (B1), a source driver outputs a plurality of unchanged source voltages expressing information to be displayed by one row of pixels corresponding to the gate line (GL1) to a plurality of source lines.