EP 0196709 B1 19900110 - LUMINOUS COLOUR SIGN FOR INFORMATION DISPLAY
Title (en)
LUMINOUS COLOUR SIGN FOR INFORMATION DISPLAY
Publication
Application
Priority
FR 8504473 A 19850326
Abstract (en)
[origin: US4755807A] A device for the display of data, comprising on the one hand a matrix of luminous dots (11a, 11b, . . . 11n) each of which is constituted by at least one pair of light-emitting diodes arranged in anti-parallel with the color of the light emitted by one diode of the pair being different from that of the other diode, and comprising on the other hand, an electric a.c. voltage supply source (16) whose output terminals (17 and 18) can be coupled to the supply terminals of the luminous dots by electronic switches (25a, 25b . . . 25m) controlled by a control signal generator (30). A color variation requirement, referred to as "background" of the sign, is obtained by rendering the electronic switches (25a, 25b, . . 25m) conducting during one and/or the other cycles of the supply voltage, while the data to be displayed are formed by the assembly of luminous dots (11i, 11j) whose connections are connected to the supply source (16) in accordance with a polarity which is inverse to that of other luminous dots which constitute the complementary "background" hue.
IPC 1-7
IPC 8 full level
G06F 3/147 (2006.01); G09F 9/33 (2006.01); G09F 13/22 (2006.01); G09G 3/32 (2016.01)
CPC (source: EP KR US)
G09F 9/33 (2013.01 - EP KR US); G09F 13/22 (2013.01 - EP KR US); G09G 3/3611 (2013.01 - KR); G09F 2013/222 (2013.01 - EP KR US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0196709 A1 19861008; EP 0196709 B1 19900110; DE 3668248 D1 19900215; FR 2579807 A1 19861003; FR 2579807 B1 19871218; JP H0664434 B2 19940822; JP S61223898 A 19861004; KR 860007625 A 19861015; KR 940010784 B1 19941111; US 4755807 A 19880705
DOCDB simple family (application)
EP 86200452 A 19860320; DE 3668248 T 19860320; FR 8504473 A 19850326; JP 6556986 A 19860324; KR 860002139 A 19860322; US 84113086 A 19860318