Liquid crystal display device and driving method thereof

A method for driving a liquid crystal display device operable to display a picture represented at least by gradation voltage data using a liquid crystal panel, comprising:nsupplying a gate control signal to control a gate driver;supplying a data control signal to control a data driver, wherein the data driver includes a buffer and a switch for a data line of each liquid crystal cell, and the switch is disposed between and connected directly to an output of the buffer and the data line;storing the gradation voltage data in the buffer before outputting the gradation voltage data to the data line;controlling the switch to control output of the gradation voltage data from the buffer to the data line;generating a source output enable (“SOE†) signal, wherein the SOE signal enables transfer of the gradation voltage data corresponding to a first horizontal line from the data driver to the liquid crystal panel;generating and counting a number of clocks;comparing the number of clocks to a reference value, and outputting one of the SOE signal and an SOE masking signal to the data driver to turn on or off the switch based on a comparison between the number of clocks and the reference value,wherein when the clock count exceeds the reference value, the SOE signal is outputted and sent to the data driver to turn on the switch such that the gradation voltage data is output from the buffer to the liquid crystal panel, and when the clock count is less than the reference value, the SOE masking signal is outputted and sent to the data driver to turn off the switch to inhibit output of the gradation voltage data from the buffer of the data driver to the liquid crystal panel during a masking interval;wherein the SOE masking signal has the masking interval corresponding a section of a tail of a gate voltage output from the gate driver at the time of initial driving;wherein the tail is generated in the gate voltage when the gate high voltage is dropped to the gate low voltage at initial operation by turn-off of the gate voltage; andwherein the rising edge of the SOE masking signal is synchronized with a turn-off of the gate voltage.

A liquid crystal display device, comprising:na liquid crystal panel comprising a plurality of liquid crystal cells, each liquid crystal cell defined by a gate line and a data line;a timing controller which generates a gate control signal, a data control signal, a source output enable (SOE) signal, and a SOE masking signal for a predetermined masking interval based on the SOE signal, wherein the SOE signal enables transfer of a pixel signal to the data line and the SOE masking signal inhibits transfer of the pixel signal to the data line;a gate driver which controls the thin film transistor connected to the gate line of each liquid crystal cell according to the gate control signal;a data driver which includes a buffer that stores the pixel signal and an output controlling unit disposed between and directly connected to an output of the buffer and the data line, the output controlling unit controlling output of the pixel signal from the buffer to the data line of the each liquid crystal cell according to the data control signal,wherein the data driver does not output the pixel signal during the masking interval; andwherein a masking signal generating unit comprises;nan oscillator which generates clocks having a certain period;a count unit operable to count a number of clocks generated by the oscillator; anda comparison unit operable to determine the high-state and the low-state of the SOE masking signal, wherein the high-state lasts until the clock count exceeds a reference value,wherein the output controlling unit of the data driver is in communication with the masking signal generating unit and controls the output of the pixel signal to the liquid crystal panel based on a comparison between the number of clocks and the reference value;wherein the SOE masking signal has the masking interval corresponding a section of a tail of a gate voltage output from the gate driver at the time of initial driving;wherein the tail is generated in the gate voltage when the gate high voltage is dropped to the gate low voltage at initial operation by turn-off of the gate voltage; andwherein the rising edge of the SOE masking signal is synchronized with turn-off of the gate voltage.

A liquid crystal display device, comprising:na liquid crystal panel comprising a plurality of liquid crystal cells, each liquid crystal cell defined by a gate line, a data line and a thin film transistor;a gate driver which controls the thin film transistor connected to the gate line of each liquid crystal cell according to a gate control signal;a data driver which outputs a pixel signal to the data line of the each liquid crystal cell according to a data control signal, wherein the data driver comprises a buffer that stores the pixel signal and a switch directly connected to an output of the buffer and the data line of the each liquid crystal cell, the switch controlling output of the pixel signal from the buffer to the data line;an initial driving control unit in communication with the switch of the data driver, controlling the switch of the data driver, and structured to compare a clock count with a predetermined reference value and operable to alternately generate a SOE masking signal and a SOE signal based on the comparison, the initial driving control unit outputting SOE masking signal to the switch to turn off the switch during a masking interval whereby the pixel signal stored in the buffer is not output to the data line during the masking interval;wherein the SOE masking signal has the masking interval corresponding a section of a tail of a gate voltage output from the gate driver at the time of initial driving;wherein the tail is generated in the gate voltage when the gate high voltage is dropped to the gate low voltage at initial operation by turn-off of the gate voltage; andwherein the rising edge of the SOE masking signal is synchronized with turn-off of the gate voltage.