Flat panel display having pre-charging circuit
Provided is a flat panel display and a method for driving the same. The flat panel display comprises a substrate, a pixel part having a plurality of sub-pixels formed on the substrate; and a data driver supplying to the pixel part data signals and charge signals containing charge values that correspond to the data signals. Each charge signal comprises a first charge signal and a second charge signal, and the first charge signal is a voltage signal selected from a plurality of preset voltage levels. The second charge signal is a current signal corresponding to the difference between the voltage value corresponding to the first charge signal and the charge value that corresponds to the data signal.
1. A pre-charging circuit for flat panel display comprising:
a substrate;
a pixel part having a plurality of sub-pixels formed on the substrate; and
a data driver supplying to the pixel part data signals and charge signals containing charge values that correspond to the data signals,
each charge signal including a first charge signal and a second charge signal, and the first charge signal being a voltage signal selected from a plurality of preset voltage levels,
wherein the second charge signal is a current signal corresponding to the difference between the voltage value corresponding to the first charge signal and the charge value that corresponds to the data signal,
wherein the data driver comprises a data output part, a data processing part, a converter which converts the data signal and the second charge signal into current values, and a switch part,
wherein the switch part comprises a first switch connected between the converter and the pixel part to supply the data signals to the pixel part, a second switch connected between the converter and the pixel part to supply the second charge signals to the pixel part, a third switch connected between the converter and a discharge path to discharge the pixel part, a fourth switch connected between the first charge signal output part and the pixel part to supply the first charge signals to the pixel part, and a current mirror part connected between the converter, the third switch and the discharge path,
wherein the data processing part determines the charge value corresponding to the data signal from the data output part and selects the first charge signal from the preset values and generates the second signal corresponding to the difference between the charge value and the first charge signal.
2. The pre-charging circuit of claim 1 , wherein the second switch is turned on when the difference between the charge value and the first charge signal is a positive value, the third switch is turned on when the difference between the charge value and the first charge signal is a negative value.
3. The pre-charging circuit of claim 1 , wherein the fourth switch comprises a plurality of switches respectively connected to a plurality of the power lines supplying the preset voltages of the first charge signal output part.
4. The flat panel display of claim 1 , wherein the sub-pixel comprises an organic light emitting diode comprising a first electrode, a second electrode and an organic light emission layer interposed between two electrodes,
wherein the sub-pixel further comprises a transistor and a capacitor electrically connected to the organic light emitting diode.