Method and electronic control system to compensate for the aging-related brightness loss of an electroluminescent element
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 29, 2011
Issued Date -
N/A
app pub date -
Dec 1, 2005
filing date -
Dec 14, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method for compensating the ageing-related loss of luminosity of an electroluminescence element, according to which the cumulative electrical energy supply, i.e. the integral of the supplied electrical power over the period of operation, is used as a criteria for the compensating regulation of the operating voltage. The processing unit continuously integrates the supplied electrical power over time. The relation between the operating voltage and the emission luminosity of the electroluminescence element is stored in the memory for different cumulative electrical energy supplies. The stored data can be defined by means of a model or estimated on the basis of empirical values. The relation can be stored in the form of values stored in a tabular manner or as an analytical function in the memory. The processing unit determines the associated effective operating voltage Ui for the luminosity nominal value B and the cumulative energy supply /Pi dt, and adjusts the voltage supply to the value by means of a control signal emitted from the signal output.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully