Patent ID: 8022917

Claim:
A liquid crystal display panel driving device with charge sharing, comprising: a plurality of scan lines arranged in rows; a plurality of data lines arranged in columns and intersected the scan lines respectively; a plurality of pixels on intersections of the scan lines and the data lines; a signal driving circuit to produce a plurality of image signals; a plurality of switches coupled to the signal driving circuit and the data lines where the image signals are sent when the switches are on; a switch control circuit, connected to the switches, for producing a plurality of sampling signals to control the switches to be on and off; a charge sharing common voltage driving circuit connected between the signal driving circuit and a common voltage node; and a common capacitor having a first terminal connected to the pixels, the data lines, and the charge sharing common voltage driving circuit through the common voltage node, and a second terminal connected to ground, wherein the switch control circuit controls the switches to be on and the charge sharing common voltage driving circuit and the signal driving circuit form a short circuit for charge sharing so as to neutralize charges stored in the common capacitor with charges on the data lines and remain at a fixed voltage for the data lines during driving the data lines of the pixels in a charge sharing trigger time, and the charges stored in the common capacitor reach the plurality of data lines through both the charge sharing common voltage driving circuit and the signal driving circuit at said charge sharing without using additional pre-charging switch transistor.