Patent ID: 8519921

Claim:
An organic light emitting diode (OLED) display, comprising: a display unit configured to display an image, the display unit including at least one OLED, the OLED having an anode and a cathode; an illuminance sensing unit configured to sense an ambient illuminance; a brightness determination unit configured to select a brightness for the OLED display according to the ambient illuminance sensed by the illuminance sensing unit; a driving voltage determination unit configured to determine a driving voltage corresponding with a current saturation point of the OLED display, the driving voltage being determined based at least in part on a driving current and the brightness selected by the brightness determination unit, and to constantly maintain a driving voltage margin, the driving voltage being applied across the anode and the cathode of the OLED; and a voltage conversion unit, the voltage conversion unit being configured to receive an input voltage, and generate a first voltage higher than the input voltage and generate a second voltage lower than the input voltage, the first voltage being supplied to the anode of the OLED and the second voltage being supplied to the cathode of the OLED so as to apply the driving voltage across the anode and the cathode of the OLED, and the voltage conversion unit being configured to adjust the second voltage in accordance with the driving voltage of the driving voltage determination unit, adjusting the second voltage including raising the second voltage as the brightness of the OLED display decreases so as to reduce a voltage difference applied across the anode and the cathode of the OLED at the current saturation point, wherein: the driving voltage determination unit is configured to access a second lookup table, the second lookup table providing the driving voltage at a current saturation point of the OLED display corresponding with the selected brightness for the OLED display.