Patent ID: 8884848

Claim:
Driver for driving an OLED, the driver comprising: output terminals for connecting to the OLED; a current sensor arranged for sensing an output current provided to the OLED; a sensor input coupled to the current sensor for receiving a measuring signal from the current sensor; a reference signal source for providing a reference signal indicating a threshold current level; the driver being configured to operate in a normal operating state, in which the driver is configured to generate at the output terminals a normal operating voltage and a normal operating current for the OLED; the driver being configured to operate in a measuring state, in which the driver is configured to generate at the output terminals a measuring voltage having an absolute value that is lower than the normal operating voltage, to compare the sensor signal with the reference signal, and to determine whether the OLED current is higher than or lower than said threshold current level; the driver being configured to operate in a healing state, in which the driver is designed to generate at the output terminals a healing voltage signal; wherein the driver is configured, while operating in the normal operating state, to briefly operate in the measuring state, and, if it is determined that the OLED current is higher than said threshold current level, to briefly operate in the healing state.