Patent ID: 7193595

Claim:
A liquid crystal display (LCD) for displaying images with a gray voltage generated by a source driver using a gamma voltage supplied from a printed circuit board, the LCD comprising: gamma voltage generation unit generating a common voltage control signal for adjusting a common voltage by as much as a kickback voltage at an intermediate gray level when a predetermined kickback voltage associated with a presently displayed image is inputted by a user utilizing a predetermined process, randomly selecting a gamma voltage at a gray level other than the intermediate gray level, and adjusting the selected gamma voltage; and a common voltage generator for adjusting the common voltage by as much as the kickback voltage at the intermediate gray level on the basis of the common voltage control signal, and outputting the adjusted common voltage to an LCD panel; wherein the gamma voltage generation unit satisfies the following equation: | Vkc−Vkt |=|( VGMAUP ( C )+ VGMADN ( C ))/2−( VGMAUP ( t )+ VGMADN ( t ))/2| where Vkc is a kickback voltage at the intermediate gray level, Vkt is the kickback voltage at the selected gray level, VGMAUP(C) and VGMADN(C) are gamma voltages inverted at the intermediate gray level, and VGMAUP(t) and VGMADN(t) are the gamma voltages inverted at the selected gray level.