Global Patent Index - EP 1844631 A1

EP 1844631 A1 2007-10-17 - METHOD AND ELECTRONIC CONTROL SYSTEM FOR COMPENSATING THE AGEING-RELATED LOSS OF LUMINOSITY OF AN ELECTROLUMINESCENCE ELEMENT

Title (en)

METHOD AND ELECTRONIC CONTROL SYSTEM FOR COMPENSATING THE AGEING-RELATED LOSS OF LUMINOSITY OF AN ELECTROLUMINESCENCE ELEMENT

Title (de)

VERFAHREN UND ANSTEUERELEKTRONIK ZUM AUSGLEICH DES ALTERUNGSBEDINGTEN HELLIGKEITSVERLUSTS EINES ELEKTROLUMINESZENZELEMENTS

Title (fr)

PROCEDE ET SYSTEME ELECTRONIQUE DE COMMANDE POUR COMPENSER LA PERTE DE LUMINOSITE DUE AU VIEILLISSEMENT D'UN ELEMENT ELECTROLUMINESCENT

Publication

EP 1844631 A1 (DE)

Application

EP 05815879 A

Priority

  • EP 2005056379 W
  • DE 102004060201 A

Abstract (en)

[origin: WO2006063938A1] The invention relates to a method for compensating the ageing-related loss of luminosity of an electroluminescence element (2), 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 (5) continuously integrates the supplied electrical power over time. The relation between the operating voltage and the emission luminosity of the electroluminescence element (2) is stored in the memory (6) 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 (6). The processing unit (5) 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 (3) to said value by means of a control signal emitted from the signal output (10).

IPC 8 full level (invention and additional information)

H05B 33/08 (2006.01)

CPC (invention and additional information)

H05B 33/08 (2013.01); Y02B 20/325 (2013.01)

Citation (search report)

See references of WO 2006063938A1

Designated contracting state (EPC)

AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

EPO simple patent family

WO 2006063938 A1 20060622; DE 102004060201 A1 20060629; EP 1844631 A1 20071017; US 2008224070 A1 20080918; US 7915839 B2 20110329

INPADOC legal status


2013-05-08 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20121115

2010-11-17 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20101018

2008-03-19 [DAX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT (TO ANY COUNTRY) DELETED

2007-10-17 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20070511

2007-10-17 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR