Liquid crystal display device having a data driving circuit with overdrive control using polarity control

摘要

The liquid crystal display of the present invention lowers the power consumption and heat generation of the data driving circuit by controlling the polarity of a data voltage by divided block-type column inversion to maintain the polarity of the data voltage within one block, and prevents picture quality degradation by inverting the polarity of a data voltage between neighboring blocks.

主权项

1. A liquid crystal display comprising:
a liquid crystal display panel having a pixel array comprising liquid crystal cells disposed in a matrix form at crossings of data lines and gate lines; a data driving circuit that converts digital video data into a positive/negative gamma compensation voltage to generate a data voltage, supplies the data voltage to the data lines, and inverts the polarity of the data voltage in response to a polarity control signal; a gate driving circuit that sequentially supplies gate pulses to the gate lines; an ODC processor that modulates the digital video data into an over driving modulation value; and a timing controller that controls operation timings of the data driving circuit and the gate driving circuit, supplies the digital video data modulated by the ODC processor to the data driving circuit, and controls the polarity of the data voltage supplied to the liquid crystal display panel by using the polarity control signal, wherein the pixel array of the liquid crystal display panel is divided into a plurality of blocks, a first polarity data voltage is charged in liquid crystal cells within an Nth (N is a natural number) block, and a second polarity data voltage is charged in liquid crystal cells within an (N+1)th block, and only the digital video data to be written into liquid crystal cells disposed in the first line of each block is modulated by the ODC processor.