Patent ID: 9183790
Filing Date: 2015-11-10
Classification: G09G

Abstract:
1. A liquid crystal display device, comprising: a liquid crystal display panel screen divided into a plurality of areas, each of which contains a plurality of pixels; a plurality of lamp tube backlight sources to selectively irradiate light respectively to the divided areas of the screen; and a controller to obtain at least one intermediate value of the brightness of the plurality of pixels of at least one of the divided areas and to control a brightness of at least one of the backlight sources which selectively illuminates the at least one divided area according to the at least one intermediate brightness value to prevent a rapid brightness deviation between said at least one of the divided areas and another divided area, wherein the controller includes: a brightness/color difference separator to separate brightness and color difference components of the data; an area determiner to divide the brightness component obtained from the brightness/color difference separator to correspond with the divided areas, an intermediate value extractor to extract an intermediate value of the brightness component for each of the divided areas; a brightness modulator to modulate the brightness component of the data by using the extracted intermediate values; a color difference delayer to delay the color difference components of the data by as much as a process time of the area determiner, the intermediate value extractor and the brightness modulator during a process time for modulating the brightness by areas of the brightness modulator wherein the modulated brightness component is synchronized with the delayed color difference components; a brightness/color difference mixer to mix the modulated brightness component and the delayed color difference component; and a control signal delayer to delay timing signals supplied from a system during a time required for the data modulation process by the controller, and wherein each of the divided areas is 3*3 pixels, and the intermediate value is the fifth brightness value among the brightness values of the 3*3 pixels in order.