Method and circuit arrangement for the ageing compensation...

Details Method and circuit arrangement for the ageing compensation... Method and circuit arrangement for the ageing compensation...

2005-09-20

2010-02-02

Mengistu, Amare (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S204000, C345S211000

Reexamination Certificate

active

07656370

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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Du-Zen Peng et al, P-134: Novel Pixel Compensation Circuit for AMOLED Display, 2005 SID International Symposium, SID 05 Digest, San Jose, CA. May 24, 2005, pp. 814-817.

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