Patent ID: 8487859
Filing Date: 2013-07-16
Classification: G09G

Abstract:
1. A data driving apparatus for a liquid crystal display device, comprising: a shift register part sequentially shifting an input source start pulse in accordance with an input source shift clock to generate a sampling signal; a latch part sequentially latching a plurality of digital pixel data in response to the sampling signal from the shift register part; a multiplexer part performing a time-division on the digital pixel data for a plurality of data lines for a first horizontal period using a polarity control signal and an even/odd signal, the digital pixel data sequentially being outputted to positive and negative paths by unit of adjacent digital pixel data; a level shifter part raising a voltage of the time-divided pixel data directly supplied from the positive and negative paths of the multiplexer part; a digital-analog converter part including: a positive digital-analog converter converting one digital pixel data of the adjacent digital pixel data inputted to the positive path from the level shifter part into a positive pixel signal with respect to a common voltage Vcom; and a negative digital-analog converter converting the other digital pixel data of the adjacent digital pixel data inputted to the negative path from the level shifter part into a negative pixel signal with respect to the common voltage Vcom; a demultiplexer part providing the positive pixel signal from the positive digital-analog converter and the negative pixel signal received from the digital-analog converter to output channels of the demultiplexer part corresponding to the data lines, during the first half of the first horizontal period and during the second half of the first horizontal period; and an output part including: a sampling part sampling the positive pixel signals and the negative pixel signals from the demultiplexer part; a holding part holding the sampled pixel signals provided through the sampling part during the previous horizontal period of the first horizontal period; and a discharging part including: a second multiplexer part having: a plurality of positive path switches connected to the positive path switches of a second demultiplexer part through the holding part and connected to the data lines; a plurality of the negative path switches connected to the negative switches of the second demultiplexer part through the holding part and connected to the data lines; and a third multiplexer part supplying the pixel signals from the output part to the corresponding data lines for the enable period of the source output enable signal and commonly supplying the common voltage Vcom of the liquid crystal cells to the corresponding data lines for the disable period of the source output enable signal, wherein the discharging part is connected between an output buffer part and the data lines and simultaneously outputs the pixel signals held in the holding part for the first horizontal period to corresponding data lines for an enable period of a source output enable signal and outputs the common voltage Vcom to the corresponding data lines for a disable period of the source output enable signal, wherein the common voltage Vcom is supplied to the corresponding data lines by the third multiplexer part, and wherein the sampling part and the holding part sample and hold the pixel signals supplied for the next horizontal period through the channel different from that of the pixel signal supplied for the first horizontal period.