Patent ID: 8044917

Claim:
A liquid crystal display device, comprising: a liquid crystal panel including a plurality of liquid crystal pixels formed in regions divided by a plurality of gate lines and a plurality of data lines, each of the pixels selected by a signal on a corresponding gate line and driven by a differential voltage between a voltage on a corresponding data line and a voltage on a common electrode; a gate driver configured to drive the plurality of gate lines; a data driver configured to drive the plurality of data lines in response to a pixel data stream; a timing controller configured to control the gate driver and the data driver; and a single-chip drive voltage generating section configured to supply voltages used by the common electrode on the liquid crystal panel, the gate driver, the data driver, and the timing controller using an external input voltage, wherein the drive voltage generating section comprises a DC-DC converter configured to generate a first supply voltage constantly maintaining a high potential by DC-DC converting the input voltage and a second supply voltage of a base potential, a gate high voltage generating section configured to generate a gate high voltage, allowing the gate driver to selectively drive the gate lines, using the first and second supply voltages, a gate low voltage generating section configured to generate a gate low voltage, allowing the gate driver to selectively disable the gate lines, using the first and second supply voltages, a level shifter configured to generate a third supply voltage, used for driving the gate driver, the data driver, and the timing controller, by level-shifting the first supply voltage and a common voltage generating section configured to generate the common voltage to be supplied to the common electrode of the liquid panel, using the first and second supply voltages, wherein the gate high voltage generating section includes a gate high voltage control section responding to a control signal and first and second transistors commonly connected to an output terminal of the gate high voltage control section, and wherein the gate high voltage control section comprises a positive charge pump, and a positive-pumped voltage from the positive charge pump is supplied to the gate driver as the gate high voltage.