Method and circuit arrangement for the ageing compensation of an organic light-emitting diode and circuit arrangement
First Claim
1. Method 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 comprising 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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Accused Products
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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Citations
15 Claims
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1. Method 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 comprising the following steps of:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification