EP 0786714 B1 20021120 - Method and apparatus for adjusting the intensity of a current or voltage controlled lighting means for rear lighting of a display device especially for motor vehicles
Title (en)
Method and apparatus for adjusting the intensity of a current or voltage controlled lighting means for rear lighting of a display device especially for motor vehicles
Title (de)
Verfahren und Anordnung zur Einstellung der Helligkeit eines strom- oder spannungsgesteuerten Leuchtmittels zur Hinterleuchtung einer Anzeige, insbesondere für Kraftfahrzeuge
Title (fr)
Procédé et dispositif de réglage d'intensité d'un moyen d'éclairage commandé en courant ou tension pour éclairage arrière d'un moyen d'affichage spécialement pour véhicules automobiles
Publication
Application
Priority
DE 19602891 A 19960127
Abstract (en)
[origin: EP0786714A2] The control is applied to a string of light-emitting diodes (LEDs) (1-3) with a series resistance (4), switched by a transistor (5) whose base drive is pulse-width modulated by a microprocessor (7) with nonvolatile electrically erasable programmable read-only memory (8) and a diagnostic interface (9). The brightness is monitored by a photometer (13) whose output is digitised (12) for the microprocessor. It is compared with a table in the memory which assigns a defined pulse width to each possible value of brightness.
IPC 1-7
IPC 8 full level
G05F 1/565 (2006.01); H05B 33/08 (2006.01); H05B 39/04 (2006.01); H05B 44/00 (2022.01); G09G 3/34 (2006.01)
CPC (source: EP)
G05F 1/565 (2013.01); G09G 3/3406 (2013.01)
Designated contracting state (EPC)
DE FR GB IT SE
DOCDB simple family (publication)
EP 0786714 A2 19970730; EP 0786714 A3 19980624; EP 0786714 B1 20021120; DE 19602891 A1 19970807; DE 59609885 D1 20030102
DOCDB simple family (application)
EP 96112912 A 19960810; DE 19602891 A 19960127; DE 59609885 T 19960810