EP 0067678 A1 19821222 - Visual display apparatus.
Title (en)
Visual display apparatus.
Title (de)
Visuelles Anzeigegerät.
Title (fr)
Appareil d'affichage visuel.
Publication
Application
Priority
GB 8118505 A 19810616
Abstract (en)
Visual display apparatus comprises movable display elements E mounted in space between a transparent glass screen G and a magnetizable sheet M. The individually movable elements E are resiliently urged to advance positions in which they abut the screen G but can be held in withdrawn positions by magnetised spots printed on to the magnetizable sheet M, the elements being of a soft magnetic material. The elements are immersed in an opaque fluid by which they are masked from view when in their withdrawn positions. A pattern-writing carriage is arranged to traverse the sheet M, writing any required pattern of magnetized spots on to the sheet, in order to establish a corresponding arrangement of the elements E.
IPC 1-7
IPC 8 full level
G09F 9/37 (2006.01)
CPC (source: EP)
G09F 9/375 (2013.01)
Citation (search report)
- [X] US 3812490 A 19740521 - GOODRICH G
- [A] US 3106794 A 19631015 - LE GOFF LUCIEN
- [A] FR 2307414 A1 19761105 - MAGNAVOX CO [US]
- [A] FR 1460598 A 19660304 - CONTRAVES AG
Designated contracting state (EPC)
AT BE DE FR NL SE
DOCDB simple family (publication)
EP 0067678 A1 19821222; GB 2101386 A 19830112; GB 2101386 B 19841024
DOCDB simple family (application)
EP 82303020 A 19820611; GB 8118505 A 19810616