Patent ID: 8803541

Claim:
A method for determining the electrical properties of an OLED, the equivalent circuit diagram of which includes a parallel connection of an equivalent diode D E and an equivalent capacitor C E , and an equivalent resistor R E connected in series with this parallel connection, comprising: measuring a value for the equivalent resistance R E based on the equivalent circuit diagram; measuring a value for the equivalent capacitance C E based on the equivalent circuit diagram at least partially concurrently with measuring the value for the equivalent resistance R E ; and measuring, separately from the time of measuring the values of the equivalent resistance R E and the equivalent capacitance C E , values for the equivalent diode D E based on the equivalent circuit diagram; wherein the values of the equivalent resistance R E and the equivalent capacitance C E are measured while limiting the voltage drop across the OLED to levels below the voltage at which the equivalent diode D E becomes conducting.