Liquid crystal display having a plurality of common voltages applied during different driving time and driving method thereof
AssigneeLG Display Co., Ltd.
InventorsHwadong Song, Younghoon Kim
Life of this patent
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Abstract
There is provided a liquid crystal display, which prevents a blur on a display image by periodically varying a common voltage of the liquid crystal display panel. The liquid crystal display comprises: a liquid crystal display panel having pixel electrodes for supplying data voltages and a common electrode for supplying a common voltage; a common voltage generator for generating common voltages of different potentials; and a common voltage supply unit for periodically changing the potential of a common voltage supplied to the common electrode by switching the common voltages from the common voltage generator.
Claims8
A liquid crystal display, comprising:
- a liquid crystal display panel having pixel electrodes for supplying data voltages and a common electrode for supplying a common voltage;
- a common voltage generator for generating common voltages of different potentials;
- and
- a common voltage supply unit for periodically changing the potential of a common voltage supplied to the common electrode by switching the common voltages from the common voltage generator,
- wherein a period of the switching the common voltages includes a variation time and a normal driving time that is greater than the variation time,
- wherein the normal driving time is set to a period of several tens of hours,
- wherein the variation time is set to a period of several minutes to several hours,
- wherein the common voltage supply unit selects any one of the common voltages from the common voltage generator to maintain the potential of the common voltage at a reference potential during the normal driving time, and selects another voltage among the common voltages from the common voltage generator to vary the common voltage to more than two different potentials during the variation time allocated between normal driving times, and
- wherein the common voltage supply unit comprises:
- a counter for counting an input timing signal and detecting a potential variation time point of the common voltage, and
- a switching controller for switching the common voltages based on an output signal of the counter.
A driving method of a liquid crystal display having a liquid crystal display panel having pixel electrodes for supplying data voltages and a common electrode for supplying a common voltage, the method comprising:
- generating common voltages of different potentials;
- periodically changing the potential of a common voltage supplied to a common electrode by switching the common voltages from a common voltage generator;
- counting an input timing signal and detecting a potential variation time point of the common voltage;
- and
- switching the common voltages based on an output signal of the counting,
- wherein a period of the switching the common voltages includes a variation time and a normal driving time that is greater than the variation time,
- wherein the normal driving time is set to a period of several tens of hours,
- wherein the variation time is set to a period of several minutes to several hours and
- wherein the periodical changing of the potential of a common voltage comprises:
- selecting any one of the common voltages to maintain the potential of the common voltage at a reference potential during the normal driving time, and
- selecting another voltage among the common voltages to vary the common voltage to more than two different potentials during the variation time allocated between normal driving times.
Dependencies are inferred from the claim text.