Patent ID: 7903127

Claim:
A display device comprising: a display unit including a plurality of data lines for transmitting data currents, a plurality of scan lines for transmitting scan signals, and a plurality of pixel areas defined by the data lines and the scan lines; a data driver for converting a plurality of grayscale data including high-order data and low-order data into at least one of the data currents, and applying the at least one of the data currents to at least one of the data lines; and a scan driver for sequentially applying the scan signals to the plurality of scan lines, wherein the data driver is configured to: divide the plurality of grayscale data into at least two nonoverlapping grayscale ranges including a first grayscale range, output a first current of the first grayscale range including at least one of the plurality of grayscale data by using the high-order data, and output a second current corresponding to the low-order data in the first grayscale range, wherein the data driver comprises: a shift register for receiving a first signal and a clock signal, and shifting the first signal in synchronization with the clock signal; a latch for latching the at least one of the plurality of grayscale data and outputting the latched grayscale data in synchronization with an output signal of the shift register; and a grayscale current generator for converting the latched grayscale data output from the latch into the at least one of the data currents, and outputting the at least one of the data currents, wherein the grayscale current generator comprises: a first current output unit for outputting the first current of the first grayscale range by using the high-order data; a multiplexer for selecting a first reference voltage of the first grayscale range from among a plurality of unit current reference voltages respectively corresponding to unit currents of the grayscale ranges, each of the unit currents and the unit current reference voltages, of a respective grayscale range of the grayscale ranges, representing a difference between two grayscale currents respectively corresponding to two grayscale data neighboring each other in the respective grayscale range; and a second current output unit for outputting the second current by using the first reference voltage output from the multiplexer and the low-order data, wherein the second current output unit comprises: a plurality of second transistors for outputting fourth currents corresponding to the first reference voltage output from the multiplexer, and a plurality of second switches for outputting the fourth currents of the second transistors as the second current in response to the low-order data, and wherein the at least one of the data currents comprises a sum of the first and second currents.