Patent ID: 8581820
Filing Date: 2013-11-12
Classification: G09G

Abstract:
1. A signal driving circuit of a liquid crystal display device, the signal driving circuit comprising: a column driver configured to: a gamma voltage circuit configured to apply the plurality of signal voltages to the column driver, the signal voltages being used as the analog gray-scale voltages; an external voltage supplying unit configured to: wherein the external voltage supplying unit comprises: wherein the digital to analog converting part comprises: wherein if the signal data represents the modification of the gray-scale voltage, the plurality of digital to analog converters generate a plurality of modified signal voltages, wherein if the signal data represents the modification of the common voltage, only one of the plurality of digital to analog converters generate a modified common voltage, the modified common voltage applied to the common electrode of the of the liquid crystal panel, and the absolute values of a normal (+) gray-scale voltage and an inverse (−) gray-scale voltage have the same voltage difference with respect to the modified common voltage, and wherein the digital to analog converting part is coupled directly to the common electrode of the liquid crystal panel.