Patent ID: 8026893
Filing Date: 2011-09-27
Classification: G09G

Abstract:
1. An apparatus for driving a liquid crystal display device having four colors of sub-pixels comprising: a data converter that converts input data of three colors inputted externally into four-color data; a data driver that converts the four-color data into video signals and then supplies the video signals to the sub-pixels; a gate driver that supplies a scan pulse to each sub-pixel; a timing controller that arranges the four-color data supplied from the data converter, and then supplies the arranged four-color data to the data driver while controlling the data driver and the gate driver; a backlight unit that provides light to the liquid crystal display panel using at least five colors of light emitting diodes; and a light emitting diode controller that controls the backlight unit in accordance with the three-color input data; wherein the data converter includes: 1) a data amplifying unit that generates three-color amplified data by multiplying the three-color input data and a gain value inputted externally; 2) a common-component extracting unit that extracts common components as white data from the three-color amplified data; and 3) a subtracting unit that subtracts the white data from the three-color amplified data, to thereby generate first to third color data, wherein the four-color data corresponds to the first to third color data and the white data; wherein the light emitting diode controller includes: 1) a color-ratio discriminating unit that generates at least two of cyan, yellow and magenta color ratio signals in accordance with the ratio of at least two colors of cyan, yellow and magenta colors from the three-color input data; and 2) a dimming signal generating unit that generates at least two light emission signals corresponding to the at least two ratio signals; wherein the cyan-color ratio signal is generated by the ratio of green/red to blue/red, the yellow-color ratio signal is generated by the ratio of green/blue to red/blue, and the magenta-color ratio signal is generated by the ratio of red/green to blue/green.