Patent ID: 7616179
Filing Date: 2009-11-10
Classification: G09G

Abstract:
1. A driving method of an organic EL device in which, when the organic EL device emits light, a source and a drain of a driving transistor and an anode and a cathode of the organic EL device are connected in series between first and second constant voltage sources and a current flows between the anode and the cathode of the organic EL device in accordance with a gate-to-source voltage of the driving transistor, the gate-to-source voltage of the driving transistor being set in the following steps: (1) disconnecting the series connection of the driving transistor and the organic EL device at the source of the driving transistor; (2) connecting a third constant voltage source maintaining a potential difference from a potential of each of the first and second constant voltage sources to a gate of the driving transistor; (3) connecting the source of the driving transistor to a signal current source and passing a signal current between the source and the drain of the driving transistor to generate a voltage between the gate and the source of the driving transistor in a capacitor disposed between the gate and the source of the driving transistor; (4) disconnecting the gate of the driving transistor from the third constant voltage source; (5) disconnecting the source of the driving transistor from the signal current source; and (6) reconnecting the source of the driving transistor to recover the series connection of the driving transistor and the organic EL device.