Organic light emitting display and power supply for the same

摘要

An organic light emitting diode (OLED) display including: a display unit including pixels (PX); and a power supply unit (500) including: an output terminal (+); a reference terminal (-) having an insulated output; and a bias circuit (520) generating a first power source voltage (+ELVDD) from a received input voltage and supplying a second power source voltage (-ELVSS) to the reference terminal (-) wherein the first power source voltage (+ELVDD) and the second power source voltage (-ELVSS) are voltages driving the plurality of pixels (PX), wherein the bias circuit (520) supplies the second power source voltage (-ELVSS) to the reference terminal (-) and the plurality of pixels (PX) and is referenced to a ground voltage, and wherein a current flowing to the pixels (PX) flows to the reference terminal (-). In the OLED display, one power supply may be used as a power supply powering electroluminescence (EL), and thereby a cost of the OLED display may be reduced and a power efficiency may be improved.