Patent ID: 8537090

Claim:
An organic electroluminescence display comprising: a pixel unit comprising pixels to display an image; a data driving unit to generate display signals in the pixels of the pixel unit; and a scan driving unit to generate a current corresponding to the display signals in the pixels of the pixel unit, wherein the data driving unit comprises: a first decoder to generate a first selection signal to correspond to a data signal; a first switch unit to receive a plurality of first voltages from a plurality of first bus lines separated from each other, and a plurality of second voltages from a plurality of second bus lines separated from each other, and to select the first voltages or the second voltages to correspond to the data signal; a second switch unit to select a first reference voltage and a second reference voltage from the selected first voltages or the selected second voltages in response to the first selection signal; a second decoder, separate from the first decoder, to generate a second selection signal to correspond to the data signal; and a grey level voltage generating unit to receive and distribute the first reference voltage and the second reference voltage, selected by the second switch unit, to generate a plurality of grey level voltages and to select and output one grey level voltage out of the plurality of the grey level voltages to correspond to the second selection signal, and wherein the data signal is classified into upper bits and lower bits, the first bus lines or the second bus lines are selected by an uppermost bit out of the upper bits, remaining upper bits except the uppermost bit are transmitted to the first decoder to generate the first selection signal, and the lower bits are transmitted to the second decoder to generate the second selection signal.