Patent ID: 8907877

Claim:
An apparatus for driving a liquid crystal display device, comprising: a liquid crystal display panel; a plurality of data ICs supplying data voltages to data lines of the liquid crystal display panel; a plurality of gate ICs supplying a gate signal to the liquid crystal display panel; and a common voltage generating unit, comprising: a plurality of smoothing circuits, each configured to: receive an average of the data voltages from a respective one of the plurality of data ICs; and output a smoothed average data voltage for the respective one of the plurality of data ICs, wherein the common voltage generating unit is configured to: generate a common voltage to drive the liquid crystal display panel with a difference between the common voltage and the at least one of the data voltages from each of the plurality of data ICs, the common voltage depending on an average of all of the smoothed averages from all of the plurality of smoothing circuits.