Liquid crystal display device

A liquid crystal display device comprising a liquid crystal panel displaying video data, a backlight unit having a plurality of light emitting elements arranged thereon for illuminating the liquid crystal panel, a video display control portion displaying a video as a sub-screen in a restricted video display area of the liquid crystal panel, and a backlight control portion controlling a light emission luminance of the light emitting elements of the backlight unit in response to control of the video display control portion, wherein

• the video display control portion controls an aperture ratio of a liquid crystal pixel lying in a region outside a sub-screen video display area to be a predetermined value,
• the backlight control portion controls a luminance value of light emitting element illuminating the region outside the sub-screen video display area to be a predetermined value in response to the control of the video display control portion, and
• a luminance of the region outside the sub-screen video display area is controlled to be a predetermined value, based on a correlation between the aperture ratio of the liquid crystal pixel lying in the region outside the sub-screen video display area, controlled by the video display control portion, and the luminance value of the light emitting element illuminating the region outside the sub-screen video display area, controlled by the backlight control portion.