Patent ID: 8022916

Claim:
A device for reducing crosstalk in a liquid crystal display (LCD) panel assembly where the LCD panel assembly includes a common electrode that capacitively couples to a plurality of pixel-electrodes and the pixel-electrodes are coupled to receive time-varying pixel data signals, the crosstalk reducing device comprising: a common voltage generator that is coupled to the common electrode of the LCD assembly to receive a feedback signal from the common electrode and to output first and second common voltage signals to the common electrode, where each of the first and second common voltage signals as well as the feedback signal includes a respective AC (alternating current) component, where the first common voltage signal is functionally related to the feedback signal, and where the second common voltage signal is functionally related to an AC component of the first common voltage signal; wherein the common voltage generator includes a negative feedback loop that operates to reduce the combined AC components of the feedback signal and of the first and second common voltage signals; and wherein the common voltage generator includes a first capacitor having first and second plates respectively connected to respective first and second output nodes that respectively have thereon the first common voltage signal and the second common voltage signal, said first capacitor causing the second common voltage signal to be functionally related to the AC component of the first voltage common voltage signal; wherein the common voltage generator voltage regulating circuit further includes: an operational amplifier that has an inverting input terminal, a non-inverting input terminal, and an output terminal, wherein the output terminal of the operational amplifier is coupled to the first output node; a second capacitor that has one end connected to receive a first reference voltage and that is further connected to the non-inverting input of the operational amplifier and where the other end of the second capacitor is grounded; a first resistor that is connected to the inverting input terminal and is connected to receive at an opposed end thereof, a second voltage obtained from said feedback signal; a second resistor that is directly connected to the inverting input terminal and to the first output node; and a third resistor that is directly connected to a third reference voltage and to the second output node.