Patent ID: 8878881

Claim:
A liquid crystal display, comprising: a data line for transmitting a data signal; a gate line for transmitting a gate signal; a data switch, electrically connected to the data line and the gate line, for providing a control of writing the data signal according to the gate signal; a liquid-crystal capacitor having a first end electrically connected to the data switch and a second end for receiving a liquid-crystal capacitor common voltage; a storage capacitor having a first end electrically connected to the data switch and a second end for receiving a storage capacitor common voltage; a common voltage generator, electrically connected to the liquid-crystal capacitor, for providing the liquid-crystal capacitor common voltage according to a preliminary common voltage; a common-voltage compensation circuit, electrically connected to the common voltage generator and the storage capacitor, for generating the storage capacitor common voltage through performing a ripple inverting operation according to the liquid-crystal capacitor common voltage, the preliminary common voltage and a compensation control signal; and a timing controller, electrically connected to the common-voltage compensation circuit, for analyzing an image input signal so as to generate the compensation control signal, wherein the timing controller comprises: an image signal analysis unit for analyzing the image input signal corresponding to only a frame to be currently displayed so as to generate a digital compensation signal, wherein the image signal analysis unit is utilized for generating a gray-level variation statistical value through analyzing adjacent pixel data of the frame to be displayed, and for providing the digital compensation signal according to the gray-level variation statistical value, the image signal analysis unit outputting the digital compensation signal having a default value when the gray-level variation statistical value is less than a threshold, and the image signal analysis unit adjusting the digital compensation signal in response to the gray-level variation statistical value when the gray-level variation statistical value is not less than the threshold; and a digital-to-analog converting unit, electrically connected to the image signal analysis unit, for performing a digital-to-analog converting operation on the digital compensation signal for generating the compensation control signal.