Data driving apparatus in a current driving type display device

A data driving apparatus for applying data signals to a plurality of data lines of a display panel, the data driving apparatus comprising:

• a multiplexer for sequentially selecting and outputting a plurality of data signals;
• a digital/analog converter DAC for sequentially converting a plurality of data signals sequentially transmitted from the multiplexer into analog data signals;
• and
• a current output unit for applying the data signals converted by the DAC into analog data currents to the data lines,
• wherein the current output unit comprises:
• an analog output current converter for inputting the analog output currents as analog output currents comprising a main signal and a sub-signal having a predetermined ratio therebetween;
• a switch for supplying the analog output currents according to a first control signal;
• and
• a current sample/hold circuit for sampling or holding the analog output currents according to a current sample/hold control signal.

A light emitting display device comprising:

• a display unit having a plurality of scan lines for transmitting selection signals, a plurality of data lines for transmitting data signals, and a plurality of pixels coupled to the plurality of data lines and the plurality of scan lines, a data driver for generating the data signals and for applying the data signals to the data lines, and a scan driver for generating the selection signals and for applying the selection signals to the respective scan lines,
• wherein the data driver comprises,
• a multiplexer for sequentially selecting a plurality of data signals and outputting the sequentially selected data signals;
• a digital/analog converter (DAC) for sequentially converting a plurality of data signals sequentially transmitted from the multiplexer into analog data signals;
• and
• a current output unit for controlling the data signals converted by the DAC to be applied to the data lines,
• and wherein the current output unit comprises:
• an analog output current converter for converting the analog output currents to analog output currents including a main signal and a sub-signal having a predetermined ratio therebetween;
• a switch for supplying the analog output currents including the main signal and the sub-signal according to a first control signal;
• and
• a current sample/hold circuit for sampling or holding the analog output currents including the main signal and the sub-signal according to a current sample/hold control signal.

A light emitting display panel comprising:

• a plurality of scan lines for transmitting selection signals;
• a plurality of data lines for transmitting data currents;
• a plurality of pixels coupled to the scan lines and the data lines;
• a scan driver for generating the selection signals and for applying the selection signals to the corresponding scan lines;
• and
• a data driver for sequentially converting a sequentially transmitted plurality of data signals into analog data signals, and for controlling a current output unit to sequentially apply the converted data signals to the data lines,
• wherein the current output unit of the data driver comprises:
• an analog output current converter for converting the analog converted output currents to analog output currents including a main signal and a sub-signal having a predetermined ratio therebetween;
• a switch for supplying the analog output currents including the main signal and the sub-signal according to a first control signal;
• and
• a current sample/hold circuit for sampling or holding the analog output currents including the main signal and the sub-signal according to a current sample/hold control signal.