| 摘要 |
A liquid crystal display device having a liquid crystal display panel to which a display datum is inputted and which has a backlight arranged at a back surface of the liquid crystal display panel. The liquid crystal display panel includes a first arrangement for identifying gray scales in respective pixel datum included in the display datum, a second arrangement for detecting each existence of predetermined gray scale levels in the gray scales identified by the first arrangement, a third arrangement for totaling up a number of the gray scale levels detected by the second arrangement, and a fourth arrangement for outputting to the backlight a control signal lying in one of a plurality of brightness control ranges of the backlight with respect to the number of the gray scale levels totaled up by the third arrangement. The fourth arrangement divides a brightness range of the backlight to be regulated thereby into the plurality of brightness control ranges.
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