Global Patent Index - EP 0952757 A3

EP 0952757 A3 2001-03-07 - Circuit for controlling the light intensity of current controlled LEDS for display illumination

Title (en)

Circuit for controlling the light intensity of current controlled LEDS for display illumination

Title (de)

Schaltungsanordnung zur Einstellung der Helligkeit stromgesteurter Leuchtdioden zur Beleuchtung einer Anzeige

Title (fr)

Circuit de commande de l'intensité lumineuse de diodes électroluminescentes controlées en courant pour l'éclairage d'afficheurs

Publication

EP 0952757 A3 (DE)

Application

EP 99107236 A

Priority

DE 19818621 A

Abstract (en)

[origin: EP0952757A2] The circuit has a control unit (2) that receives (6) a signal corresponding to the desired intensity and sets the LED (1) control current taking into account a degradation value. The control unit determines the degradation value by recording the operating duration of the diode and places a corresponding value in a memory (7) containing degradation information. The control unit determines the degradation value from the stored information and the measured operating duration and updates it at appropriate time intervals.

IPC 1-7 (main, further and additional classification)

H05B 33/08; H01S 3/103; H05B 37/03

IPC 8 full level (invention and additional information)

H05B 33/08 (2006.01); H05B 37/03 (2006.01)

CPC (invention and additional information)

H05B 33/0851 (2013.01); H05B 33/0893 (2013.01); H05B 37/03 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0952757 A2 19991027; EP 0952757 A3 20010307; EP 0952757 B1 20040804; DE 19818621 A1 19991028

INPADOC legal status


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2011-06-17 [REG FR TP] TRANSMISSION OF PROPERTY

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2005-07-27 [26N] NO OPPOSITION FILED

- Effective date: 20050506

2005-06-03 [ET] FR: TRANSLATION FILED

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2004-09-09 [REF] CORRESPONDS TO:

- Document: DE 59910096 P 20040909

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2003-08-13 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: 7H 05B 33/08 A

2003-08-13 [RIC1] CLASSIFICATION (CORRECTION)

- IPC: 7H 05B 37/03 B

2002-08-07 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: SIEMENS AKTIENGESELLSCHAFT

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2001-03-07 [RIC1] CLASSIFICATION (CORRECTION)

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