Patent ID: 7990351

Claim:
A driving circuit for Liquid Crystal Display (LCD) device, comprising: a unity-gain operational amplifier (OP amp) for buffering and carrying a signal voltage on a transmission line; a first switch for switching a connection between a noninverting terminal of the unity-gain OP amp and an input line of the signal voltage; a second switch whose one end is connected to the input line of the signal voltage; a third switch whose one end is connected to the noninverting terminal of the unity-gain OP amp; a first capacitor whose one end is connected to the other end of the third switch and other end is connected to the other end of the second switch, wherein the one end of the first capacitor is coupled through the noninverting terminal of the unit-gain OP amp through the third switch and does not have any connection with an inverting terminal of the unit-gain OP amp, and wherein the driving circuit use the first, second and third switches for controlling its operation and the first capacitor is charged and discharged only by the input line; a second capacitor whose one end is connected to the other end of the first capacitor and other end is connected to the ground voltage terminal, and a switch controller for generating a plurality of control signals to control the first to third switches, wherein the switch controller generates: the control signals to turn on the first and the third switches and turn off the second switch to first duration for storing a portion of an output image signal voltage in the first capacitor as a pre-emphasis voltage; the control signals turn on the first and the second switches and turn off the third switch for a third duration for amplifying and outputting only the input image signal voltage excluding the pre-emphasis voltage; and the control signals to turn on the first on third switches for a fourth duration for removing an electronic charged in the first capacitor.