EP 1383103 B1 20120321 - Automatic adaptation of the supply voltage of an electroluminescent panel depending on the desired luminance
Title (en)
Automatic adaptation of the supply voltage of an electroluminescent panel depending on the desired luminance
Title (de)
Automatische Anpassung der Versorgungsspannung eines Elektrolumineszenz-Anzeigeschirmes in Abhängigkeit der gewünschten Luminanz
Title (fr)
Adaption automatique de la tension d'alimentation d'un ecran electroluminescent en fonction de la luminance souhaitee
Publication
Application
Priority
FR 0209227 A 20020719
Abstract (en)
[origin: EP1383103A1] A first measuring system generates a first signal representing the voltage of at least one display column (C1, C2, Cn). A second measuring system generates a second signal representing the voltage at a reference point. The first and second signals are supplied to an adjustment circuit, which can increase the polarisation voltage (Vpol) until the first signal is greater than the second signal, or vice versa. The device is used to control the polarisation voltage for command circuits for the columns of a matrix display composed of electroluminescent diodes, each diode being connected to a line and a column in the display. The command circuits include a current mirror (9) comprising a reference branch (bref) and a number of duplication branches (b1, b2, bn) connected to the polarisation voltage. Each duplication branch is connected to a column in the display. The reference branch is connected at a reference point to a reference current source (10) providing a desired brightness current. An Independent claim is also included for a method for controlling polarisation voltage for command circuits for electroluminescent panels.
IPC 8 full level
G09G 3/32 (2006.01)
CPC (source: EP US)
G09G 3/3216 (2013.01 - EP US); G09G 3/3283 (2013.01 - EP US); G09G 3/32 (2013.01 - EP US); G09G 2320/029 (2013.01 - EP US); G09G 2320/043 (2013.01 - EP US); G09G 2330/02 (2013.01 - EP US); G09G 2330/021 (2013.01 - EP US); G09G 2330/08 (2013.01 - EP US); G09G 2330/12 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 1383103 A1 20040121; EP 1383103 B1 20120321; US 2004017725 A1 20040129; US 2005035933 A1 20050217; US 7755580 B2 20100713
DOCDB simple family (application)
EP 03300065 A 20030717; US 62241603 A 20030718; US 91784604 A 20040813