Organic light emitting diode display system

An organic light emitting diode (OLED) display system, comprising:

• a display panel including a plurality of pixels;
• a driving circuit connected to the plurality of pixels through a plurality of scan line sets and
• a plurality of data lines, the driving circuit configured to provide a plurality of scan signals to the display panel and configured to provide data voltages to the plurality of data lines;
• a voltage generator configured to generate a negative voltage based on a first driving voltage having a positive level and a second driving voltage having a negative level, and configured to provide the negative voltage to the driving circuit;
• and
• a power management application circuit including a power management integrated circuit (PMIC) and an additional circuit, the PMIC configured to apply a high power supply voltage and a low power supply voltage to the display panel and configured to generate the first driving voltage based on a battery voltage, the additional circuit configured to generate the second driving voltage based on the battery voltage,
• wherein the additional circuit includes a first part distinct from the PMIC and disposed externally to the PMIC and a second part disposed in the PMIC,
• wherein the driving circuit is configured to generate at least one of the plurality of scan signals based on the negative voltage, and
• wherein the additional circuit includes:
• a first capacitor coupled between a first node and a second node in the PMIC, the first node being coupled to an inductor to store the battery voltage;
• a first switch coupled between the second node and a ground voltage;
• a second switch coupled between the second node and a third node to receive the second driving voltage;
• and
• a second capacitor coupled between the third node and a fourth node connected to the ground voltage,
• wherein the first part includes the first capacitor and the second capacitor, and
• wherein the second part includes the first switch and the second switch.