Patent ID: 7843447
Filing Date: 2010-11-30
Classification: G09G

Abstract:
1. A liquid crystal display device, comprising: a liquid crystal display panel including an array substrate on which a plurality of data lines and a plurality of scan lines are aligned, a common substrate having a common electrode, and liquid crystals interposed between the array substrate and the common substrate; a power supply part for generating a power supply voltage, and for producing a common power supply voltage; and a feedback circuit part connected between the power supply part and the common electrode of the common substrate; wherein the feedback circuit part comprises a negative feedback part having a first input connected to the power supply part and having an output, a buffer part having an input connected to the output of the negative feedback part and having an output connected to the common electrode of the common substrate, a low-pass filter part connected to a junction between the output of the buffer part and the common electrode of the common substrate for receiving a third ripple voltage from the common electrode, a first impedance, and a second impedance; said first impedance being connected between the output of the negative feedback part and a second input of the negative feedback part; and said second impedance being connected directly between the output of the buffer part and the second input of the negative feedback part.