Patent ID: 8243010
Filing Date: 2012-08-14
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal panel including a plurality of pixels arranged in a matrix; a backlight unit divided into a plurality of blocks; a global brightness controller that generates a data modulation control signal using a single frame image data to be displayed on the liquid crystal panel; a local brightness controller that generates a plurality of modulated local dimming control signals for a plurality of divisional regions divided from the single frame image data; a data modulator that generates a modulated data from the single frame image data by using the data modulation control signal, and supplies the modulated data to the liquid crystal panel; and a backlight driver that supplies the blocks of the backlight unit with a plurality of driver signals which correspond to the plurality of modulated local dimming control signals, respectively, wherein the plurality of divisional regions correspond to the plurality of blocks, respectively, wherein the global brightness controller includes a global mean calculator that produces a global mean value for a plurality of pixels included in the single frame image data; a data modulation control signal generator that generates the data modulation control signal using the global mean value; and a global dimming control signal generator that generates a global dimming control signal corresponding to the data modulation control signal, wherein the local brightness controller includes a region divider that divides the single frame image data into the plurality of divisional regions; a local mean calculator that averages the plural pixel data included in each of the divisional regions to generate a plurality of local mean values for the divisional regions; a maximum region selector that selects a divisional region having the maximum mean value among the local mean values for the plural divisional regions; a first local dimming control signal generator that generates a plurality of first local dimming control signals each corresponding to the local mean values of the divisional regions; a second local dimming control signal generator that generates a plurality of second local dimming control signals for the divisional region from the global dimming control signal and the first local dimming control signals for the divisional region; and a third local dimming control signal that generates a plurality of third local dimming control signals, for the divisional regions, corresponding to the respective second local dimming control signals for the divisional regions.