EP 0109671 B1 19880420 - LIGHT-EMITTING ELEMENT
Title (en)
LIGHT-EMITTING ELEMENT
Publication
Application
Priority
FR 8220334 A 19821123
Abstract (en)
[origin: US4559480A] This light emitting element (24) constitutes a pixel a plurality of which when arranged in rows and columns may form a matrix display board. The element comprises one or more discharge tubes (10, 11, 12). For a board displaying images (textual or video) in color the internal wall of each tube is coated with a fluorescent substance which responds respectively to the red, green and blue portions of the spectrum. By independently varying the intensity of the light emitted by each tube light is obtained at the element output the resultant wavelength of which may extend over the entire visible spectrum. The invention finds use in a display board employed to convey information to crowds of people as for example in a sports stadium.
IPC 1-7
IPC 8 full level
G09F 9/313 (2006.01); G09F 13/26 (2006.01)
CPC (source: EP US)
G09F 9/313 (2013.01 - EP US); G09F 13/26 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE GB LI NL
DOCDB simple family (publication)
EP 0109671 A2 19840530; EP 0109671 B1 19880420; AU 2159183 A 19840531; AU 561918 B2 19870521; CA 1212711 A 19861014; DE 3376366 D1 19880526; FR 2536563 A1 19840525; FR 2536563 B1 19850726; JP S59140481 A 19840811; US 4559480 A 19851217
DOCDB simple family (application)
EP 83111537 A 19831118; AU 2159183 A 19831122; CA 441715 A 19831122; DE 3376366 T 19831118; FR 8220334 A 19821123; JP 21879983 A 19831122; US 55180083 A 19831115