PIXEL CIRCUIT, DATA DRIVING CIRCUIT AND ORGANIC LIGHT EMITTING DISPLAY COMPRISING THEREOF

摘要

A pixel circuit, a data driving circuit and an organic light emitting display device having the data driver are provided to increase an operational margin of the OLED by compensating for a degradation of a stability of a feedback loop due to a parasitic capacitance and a parasitic resistance. A data driver for an OLED(Organic Light Emitting Device) includes a current DAC(610) and first and second amplifiers(620,630). The current DAC(Digital to Analog Converter) outputs a data current according to input data. The first amplifier is electrically connected to a pixel circuit through a data line and controls the data current, so that the data current is equalized with a current pixel current which is fed back from the pixel circuit through a feedback line. The second amplifier is electrically connected to the pixel circuit through the feedback line and maintains a constant voltage on the feedback line. The second amplifier delivers the pixel current to the first amplifier.