1. A liquid crystal display (LCD) comprising: a liquid crystal panel comprising a plurality of pixel areas, each of the pixel areas having a plurality of pixels; and a signal controller configured to receive an original image signal and to generate a target image signal corresponding to the original image signal by, for each gray level in the original image signal, subtracting a positive kickback voltage from a voltage of the original image signal having a positive polarity corresponding to the gray level, and adding a negative kickback voltage to a voltage of the original image signal having a negative polarity corresponding to the same gray level, wherein the signal controller comprises: a dithering unit configured to generate a corrected image signal based on dithering patterns corresponding to the target image signal; a driving unit configured to transmit the corrected image signal to the liquid crystal panel, the corrected image signal comprising a positive corrected image signal and a negative corrected image signal, wherein the driving unit is configured to alternately transmit the positive corrected image signal and the negative corrected image signal to the liquid crystal panel; a storage unit configured to store the positive kickback voltage and the negative kickback voltage at each gray level, configured to store the dithering patterns, and comprising: a first storage unit configured to store the positive kickback voltage and the negative kickback voltage at each gray level; and a second storage unit configured to store a target image signal, an expanded target image signal, a plurality of eigenvalues, and dithering patterns corresponding to the eigenvalues; a gray determination unit configured to determine a gray level of the target image signal by analyzing a gray level of the original image signal; and the dithering unit configured to generate a corrected image signal by correcting a target image signal corresponding to each pixel area.