Patent ID: 7079092

Claim:
Drive circuitry for a common anode, passive matrix, organic light-emitting diode (OLED) display comprising at least one OLED having an anode and a cathode, the cathode of the OLED being coupled in series to a first current source and a first switching means, and the anode of the OLED being coupled in series to a second switching means, wherein the drive circuitry is adapted so that one cycle for the at least one OLED consists of a charge time of the OLED which starts with the voltage between the cathode and anode of the OLED being zero, followed by pre-charging the at least one OLEO to a strictly positive voltage level before closing the first switching means, followed by maintaining a working voltage for the ON-time, followed by an OFF-time in which the cathode voltage returns to the voltage at the anode after which the cycle is repeated.