Patent ID: 7495645

Claim:
A liquid crystal display device capable of preventing flicker, comprising: a plurality of liquid crystal cells provided at crossings of a plurality of data lines and a plurality of gate lines; a first switching device for supplying a video signal, wherein said video signal is sequentially inverted to have a positive video signal and a negative video signal from the data line to the liquid crystal cell in response to a voltage at a control terminal; a second switching device for applying a gate signal at the ith gate line to the control terminal in response to a voltage at the i−1 th gate line, thereby charging said voltage of the control terminal, wherein i is an integer; and a capacitor connected to a gate terminal of the first switching device such that the first switching device maintains a turn-on state when the gate terminal of the first switching device is converted into a floating state; wherein the gate signal includes first and second gate signals; wherein the first gate signal and second gate signal are one horizontal period apart; wherein the first gate signal remains at a high state during two horizontal periods while the second gate signal remains at a high state during one horizontal period, and the first gate signal applied to the i−1 th gate line overlaps with the first gate signal applied to the ith gate line during one horizontal period; wherein the first gate signal is applied to the i−1 th gate line, and the first gate signal is applied to the ith gate line in such a manner to rise after one horizontal period; wherein the first gate signal applied to the floated gate terminal of the first switching device rises by the positive video signal by a bootstrap when the positive video signal is applied to the liquid crystal cell provided at the ith horizontal line; wherein the first gate signal applied to the floated gate terminal of the first switching device falls by the negative video signal by a bootstrap when the negative video signal is applied to the liquid crystal cell provided at the ith horizontal line.