LIQUIDE CRYSTAL DISPLAY

摘要

An LCD device is provided to replace the black gradation area of an existing gamma voltage generator with a common voltage generator to have no need to generate a separate common voltage generator, thereby reducing the entire size of a PCB(Printed Circuit Board) and cost. An LCD(Liquid Crystal Display) panel(30) displays an image. A gamma/common voltage generator(22) generates a gamma voltage and a common voltage to supply the gamma voltage and the common voltage to the LCD panel respectively. A tuning unit(27) produces common voltage values changed according to different sizes of LCD panels as optimal common voltage values. A storage unit(25) stores the optimal common voltage values provided from the tuning unit in an LUT(Look Up Table) form. A data driving unit(26) selects a gamma voltage corresponding to data out of plural gamma voltages to supply the selected gamma voltage to the LCD panel.