Invention Grant
- Patent Title: Method and circuit arrangement for the ageing compensation of an organic light-emitting diode and circuit arrangement
- Patent Title (中): 有机发光二极管老化补偿方法及电路装置及电路装置
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Application No.: US11231329Application Date: 2005-09-20
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Publication No.: US07656370B2Publication Date: 2010-02-02
- Inventor: Oliver Schneider , Jan Birnstock
- Applicant: Oliver Schneider , Jan Birnstock
- Applicant Address: DE Dresden
- Assignee: Novaled AG
- Current Assignee: Novaled AG
- Current Assignee Address: DE Dresden
- Agency: Sutherland, Asbill and Brennan, LLC
- Priority: DE102004045871 20040920
- Main IPC: G09G3/32
- IPC: G09G3/32

Abstract:
The invention relates to a method and a circuit arrangement for the ageing compensation of an organic light-emitting diode (OLED) which is fed from a supply voltage and is switched by means of a driver transistor operated in saturation operation, by means of a driving of the light-emitting diode. The method comprises the following steps of: storing at least one desired current-voltage value pair of a desired current-voltage characteristic curve of the light-emitting diode; transferring the driver transistor from saturation operation to linear operation during a measurement cycle; measuring a current value for the current through the light-emitting diode by means of a current measuring circuit in the measurement cycle; determining at least one present current-voltage value pair of a present current-voltage characteristic curve of the light-emitting diode by means of the measured current value; comparing the at least one present current-voltage value pair of the light-emitting diode with the desired current-voltage value pair of the light-emitting diode; and generating driving parameters for driving the light-emitting diode in a manner dependent on the result of the comparison.
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