An LED driver 5 includes current sources (52R, 52G, 52B) for generating drive current of LED (4R, 4G, 4B); and a black insert control section (54) for generating a black insert signal (BK) for determining a black insert period in one frame from a frame synchronizing signal (such as vertical synchronizing signal VS). The current sources (52R, 52G, 52B) stop current supply to the LEDs (4R, 4G, 4B) during the black insert period according to the black insert signal (BK). With this configuration, it is possible to enhance the moving image visibility of a liquid crystal display device without increasing the load on display control means or significantly lowering the light source brightness.