Patent ID: 7944418

Claim:
A data driving circuit for driving a pixel of a light emitting display based on k-bit externally supplied data for the pixel, wherein the pixel is electrically connectable to the driving circuit via a data line, where k is a natural number, the data driving circuit comprising: a gamma voltage generator generating a plurality of gradation voltages; a current sink, the current sink receiving a predetermined current from the pixel via the data line during a first partial period of one complete period for driving the pixel; a voltage generator generating an incrementally increasing compare voltage during the first partial period of the one complete period; a comparator comparing a compensation voltage generated based on the predetermined current with the incrementally increasing compare voltage and generating a logic signal based on a result of the compare; a compensation unit generating p-bit compensation data based on the logic signal, where p is a natural number; and a digital-analog converter generating a composite data using the p-bit compensation data and the k-bit externally supplied data and selecting, as a data signal for the pixel, one of the plurality of gradation voltages based on a bit value of the composite data.