Patent ID: 7176869

Claim:
A drive circuit for use in a liquid crystal display, said drive circuit supplying source signal from a source driver to pixel electrodes through switching by means of thin film transistors according to scan signals from a gate driver, said drive circuit comprising adjusting means for adjusting potential differences between the pixel electrodes and a common electrode, wherein the adjusting means is composed of voltage level altering means for shifting voltage levels of the source signals supplied by the source driver equally for all the pixel electrodes, wherein the voltage level altering means provided in a reference voltage generator means for producing source driver reference voltages from which the source driver produces the voltage levels of the source signals and is composed of: voltage divider means for producing and supplying the source driver reference voltages by voltage division of a difference between high and low reference; voltages high-and-low-reference-voltage-interconnecting means for altering the high and low reference voltages in an interconnected manner; and low-reference-voltages-specifying means for specifying a ratio of the low reference voltage to the high reference voltage.