Patent ID: 7643000

Claim:
A liquid crystal display device, comprising: a data driver for supplying a data signal to a data line of a liquid crystal display panel; and a common voltage generator for supplying a high common voltage or a low common voltage to a common electrode of the liquid crystal display panel, wherein the data driver includes a logic circuit part, a digital-analog converter and an output buffer part, wherein the output buffer part of the data driver includes a plurality of output buffers connected to the data line, each output buffer of the data driver including a first switch connected to a first high potential voltage line, a second switch connected to a first low potential voltage line and a third switch connected between a ground voltage line and an output line of the output buffer, wherein the output buffer part of the data driver divides one horizontal period into an on-period and an off-period of the plurality of output buffers using the first and second switches, wherein the common voltage generator includes a first common voltage generator for generating the high common voltage, a second common voltage generator for generating the low common voltage and an output buffer part, wherein the output buffer part of the common voltage generator includes a first and second output buffers respectively connected to output lines of the first and second common voltage generators, each output buffer of the common voltage generator including a first switch connected to a second high potential voltage line, and a second switch connected to a second low potential voltage line, the output buffer part of the common voltage generator further including a third switch for switching the output of the first and second output buffers and a fourth switch for grounding the common electrode, wherein the output buffer part of the common voltage generator divides one horizontal period into the on-period and off-period of the first and second output buffers through the first and second switches.