Driver for analyzing the state of the organic light emitting diode element and for supplying a recovery voltage to the organic light emitting diode element

摘要

A driver (30) for driving an OLED (20) comprises: output terminals (31, 32); a current sensor (35) sensing the output current; a sensor input (33) coupled to the current sensor; a reference signal source (36) providing a reference signal (Sref) indicating a threshold current level (Ith). In a normal operating state (N), a normal operating voltage (VN) and a normal operating current (IN) are generated. In a measuring state (M), a measuring voltage (VM) lower than the normal operating voltage is generated, the sensor signal is compared with the reference signal, and it is determined whether the OLED current is higher than said threshold current level. In a healing state (H), a healing voltage signal (VH) is generated. If it is determined that the OLED current is higher than said threshold current level, the driver is designed to briefly operate in the healing state.