Patent ID: 8368637

Claim:
A liquid crystal display, comprising: a liquid crystal display panel which displays a picture; a backlight unit including a light guide plate part in which first light guide channels of a first direction and second light guide channels of a second direction intersected with the first direction are formed, first light array for illuminating light to the first light guide channels, and second light array for illuminating light to the second light guide channels, respectively, where blocks are defined by intersection of a plurality of first line blocks in parallel with one another in the first direction corresponding to the first light guide channels and a plurality of second line blocks in parallel with one another in the second direction corresponding to the second light guide channels; and a dimming controller for analyzing an input picture to correspond to the blocks to obtain first dimming values for independently controlling luminances of light sources of the first light array, determining second dimming values for independently controlling luminances of light sources of the second light array based on the first dimming values, adjusting the first and second dimming values so that a luminance difference between neighboring blocks caused by the first and second dimming values is decreased, and lowering an entire luminance of a display picture by an amount of luminance increased by the adjustment of the first and second dimming values, wherein each of the first dimming values is determined based on a first maximum luminance value determined for each of the first light guide channels of the first direction, the first maximum luminance value is determined among final target luminance values of the blocks corresponding to each of the first light guide channels, wherein each of the second dimming values is determined based on a second maximum luminance value determined for each of the second light guide channels of the second direction, and wherein the second maximum luminance value is determined among intermediate target luminance values which are difference values between the first maximum luminance value from the final target luminance values.