An image display device comprises a liquid crystal display panel, panel driving circuits, a backlight configured to include a plurality of light source blocks, and a controller configured to modulate input data to generate image data synchronized with N multiple frame frequency, control the panel driving circuits such that same image data are displayed every two consecutive frame periods, control the light source blocks to be sequentially turned on during a light source scanning period, and control the light source blocks to be simultaneously turned off during a light source blinking period between neighboring light source scanning periods.