Global Patent Index - EP 1058923 A1

EP 1058923 A1 2000-12-13 - LIGHT DISPLAY PANEL CONTROL

Title (en)

LIGHT DISPLAY PANEL CONTROL

Title (de)

STEUERUNG FÜR EINE LEUCHTANZEIGETAFEL

Title (fr)

COMMANDE D'UN PANNEAU D'AFFICHAGE LUMINEUX

Publication

EP 1058923 A1 (FR)

Application

EP 99938008 A

Priority

  • FR 9900475 W
  • FR 9802694 A

Abstract (en)

[origin: FR2775821A1] The invention concerns a light display panel with a matrix of pixels (5) comprising each three monochrome electroluminescent diodes (6, 7, 8) of three colours. The diodes are controlled by a control circuit (9) delivering electrical power P to each diode, said electrical power being expressed in the form P=k.Pr, wherein Pr is a reference electrical power particular to the diodes of each colour and k is a coefficient selected according to the display to be presented. In course of time the reference electrical power is subjected to different variations depending on the colours, to compensate for the ageing of the diodes.

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

G09G 3/32

IPC 8 full level (invention and additional information)

G09F 9/33 (2006.01); G09F 15/00 (2006.01); G09G 3/12 (2006.01); G09G 3/30 (2006.01); G09G 3/32 (2006.01)

CPC (invention and additional information)

G09G 3/12 (2013.01); G09G 3/32 (2013.01); G09G 2320/043 (2013.01)

Citation (search report)

See references of WO 9945525A1

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

FR 2775821 A1 19990910; FR 2775821 B1 20000526; AT 241844 T 20030615; AU 3257499 A 19990920; DE 69908309 D1 20030703; DE 69908309 T2 20040429; DK 1058923 T3 20030922; EP 1058923 A1 20001213; EP 1058923 B1 20030528; ES 2199586 T3 20040216; PT 1058923 E 20030930; US 6756952 B1 20040629; WO 9945525 A1 19990910

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