Patent ID: 8253655
Filing Date: 2012-08-28
Classification: G09G

Abstract:
1. A common-voltage compensation circuit for use in a liquid crystal display having a liquid-crystal capacitor and a storage capacitor, the common-voltage compensation circuit comprising: a buffer for receiving a preliminary common voltage, the buffer driving an output current according to the preliminary common voltage; a current/voltage converter, electrically connected to the buffer, for generating a liquid-crystal capacitor common voltage furnished to the liquid-crystal capacitor according to the output current; a high-pass filter, electrically connected to the current/voltage converter, for performing a high-pass filtering operation on the liquid-crystal capacitor common voltage for extracting a first ripple voltage; and a ripple-voltage inverter, electrically connected to the high-pass filter, for performing an inverting operation on the first ripple voltage based on the preliminary common voltage for generating a storage capacitor common voltage having a second ripple voltage with a phase opposite to the first ripple voltage, the storage capacitor common voltage being furnished to the storage capacitor.