Patent ID: 7719512

Claim:
A liquid crystal display comprising: a liquid crystal display panel including a plurality of gate and data lines arranged to cross each other, and a thin film transistor and a pixel electrode disposed at each crossing of the gate and data lines, and in which an image is displayed on the liquid crystal display panel according to scan signals supplied through the gate lines and analog pixel signals supplied through the data lines; a gate driver for sequentially supplying the scan signals to the gate lines of the liquid crystal display panel; a source driver for converting inputted pixel data into analog pixel signals and supplying the converted analog pixel signals to the data lines of the liquid crystal display panel; a timing controller for supplying a timing control signal to the gate driver and the source driver and supplying the pixel data to the source driver; a back light unit (BLU) including a side radiation type Light Emitting Diode (LED) array and being sectionally driven by a plurality of unit areas to irradiate light to the liquid crystal display panel; and a luminance controller for receiving the pixel data from the source driver, and controlling a luminance of the LED array by unit areas according to the pixel data, wherein the luminance controller controls the luminance of the LED array using a luminance contribution percentage including a ratio in which a luminance of adjacent unit areas that surround a reference unit area affects that of the reference unit area, wherein the luminance controller detects a brightest unit area among the reference unit area and the adjacent unit areas using the pixel data, and if the reference unit area is the brightest area, the luminance controller controls the reference unit area to have an average luminance of pixel data corresponding to the reference unit area, whereas if one or more of the adjacent unit areas is/are brighter than the reference unit area, the luminance controller calculates a correction luminance using a substantial luminance percentage including a ratio in which the luminance of the reference unit area is changed by the luminance of the adjacent unit areas and each luminance contribution percentage of the adjacent unit areas, and controls the reference unit area to have the calculated correction luminance, and wherein the correction luminance of the reference unit area is obtained by dividing a sum of a value obtained by multiplying the average luminance and the substantial luminance percentage of the reference unit area, and a value obtained by multiplying an average luminance and each luminance contribution percentage of the adjacent unit areas by the number of the adjacent unit areas.