It is an object of the invention to provide an
image display device for improving the
image quality of moving images and still images displayed on a
liquid crystal display device while controlling increase in
power consumption. A
liquid crystal panel for performing input
image display and black
image display at an arbitrary black display
time ratio in one frame period, a
movement detection unit for detecting a movement of the input image and outputting movement information, a display ratio
control unit for fixing the black display
time ratio based on the movement information, and a display brightness
control unit for controlling brightness of the
liquid crystal panel for one frame period to be substantially constant irrespective of the black display period are provided. The
movement detection unit detects whether the input image is a moving image or a still image, and the display ratio
control unit sets at least one transient black display
time ratio between the black display time ratios for the moving image and the still image which is determined according to the result of the
movement detection unit, so that the black display time ratio changes midway to the transient black display time ratio in the period when the black display time ratio is switched between the moving image and the still image.