Digital-analog converter, data driver, and flat panel display device using the same

A data driver comprising:

• a shift register unit for providing sampling signals by generating at least one shift register clock;
• a sampling latch unit for sampling and latching digital data having a plurality of bits by receiving the sampling signals for every column line;
• a holding latch unit for simultaneously receiving and latching digital data latched in the sampling latch unit, and for converting and outputting the digital data in a serial state for every channel;
• and
• a digital-analog converter for generating analog gray scale voltages to correspond to bit values of the digital data supplied from the holding latch unit in a serial state and for outputting the gray scale voltages to data lines, and comprising a switch coupled between a first one of at least two data lines and a second one of the at least two data lines for electrically coupling a sampling capacitor formed by a parasitic capacitance component of the first one of the at least two of the data lines and a holding capacitor formed by a parasitic capacitance component of the second one of the at least two of the data lines together,
• wherein the sampling capacitor and the holding capacitor are configured to concurrently sample a reference voltage that is applied between terminals of the sampling capacitor in accordance with the digital data, and
• wherein the switch is configured to be off when the holding capacitor is initialized with the reference voltage.

A flat panel display device comprising:

• a display region comprising a plurality of pixels connected with a plurality of scan lines arranged in a first direction and a plurality of data lines arranged in a second direction;
• a data driver for supplying analog gray scale voltages to the plurality of pixels;
• and
• a scan driver for supplying scan signals to the scan lines,
• wherein the data driver generates the analog gray scale voltages corresponding to digital data input through charge sharing between a sampling capacitor formed by a parasitic capacitance component of a first one of at least two of the data lines and a holding capacitor formed by a parasitic capacitance component of a second one of the at least two of the data lines and provides the analog gray scale voltages to corresponding ones of the plurality of pixels,
• wherein the sampling capacitor and the holding capacitor are configured to concurrently sample a reference voltage that is applied between terminals of the sampling capacitor in accordance with the digital data, and
• wherein the data driver comprises a switch coupled between the first one of the at least two data lines and the second one of the at least two data lines for electrically coupling the sampling capacitor and the holding capacitor together, and the switch is configured to be off when the holding capacitor is initialized with the reference voltage.

A data driving method of a flat panel display device comprising:

• serially inputting each of a plurality of bits of digital data;
• executing charge sharing between a sampling capacitor formed by a parasitic capacitance component of a first one of at least two data lines of a plurality of data lines and a holding capacitor formed by a parasitic capacitance component of a second one of the at least two data lines for a plurality of periods during which each of the plurality of bits of the digital data is input, the sampling capacitor and the holding capacitor being configured to concurrently sample a reference voltage that is applied between terminals of the sampling capacitor in accordance with the digital data;
• applying a result of the charge sharing executed at a last one of the plurality of periods to corresponding ones of a plurality of pixels through the plurality of data lines as final gray scale voltages;
• and
• prior to said executing charge sharing, initializing the holding capacitor with the reference voltage while the sampling capacitor and the holding capacitor are electrically separated by a switch coupled between the first one of the at least two data lines and the second one of the at least two data lines.