Patent ID: 9672764
Date: 2017-06-06
CPC Classifications: G02F,G09G

Claim:
1. A liquid crystal display device comprising: a liquid crystal display unit that includes a liquid crystal display panel, and a backlight unit capable of individually controlling luminance of each of a plurality of segment areas into which a display area of the liquid crystal display panel is divided; an image data acquisition unit that acquires image data; a luminance set value calculation unit that calculates a luminance set value of each of the segment areas on the basis of luminance information in the image data corresponding to each of the segment areas; a luminance control unit that controls luminance of each of the segment areas by multiplying the luminance set value of each of the segment areas by a coefficient determined on the basis of a statistic of a video signal level of the image data; an integrated value calculation unit that calculates a first integrated value as the statistic by adding up the luminance set value of each of the segment areas for one screen in the image data on the basis of a calculation result of the luminance set value calculation unit; and a threshold value storage unit that stores a preset range of the first integrated value suitable for viewing as a first threshold value, wherein the luminance control unit determines a coefficient KU, where KU<1, as the coefficient and repeatedly multiplies each of the luminance set values by the coefficient KU until the first integrated value is within the range of the first threshold value in a case where the first integrated value is larger than the range of the first threshold value, and the luminance control unit determines a coefficient KL, where KL>1, as the coefficient and repeatedly multiplies each of the luminance set values by the coefficient KL until the first integrated value is within the range of the first threshold value in a case where the first integrated value is smaller than the range of the first threshold value.