The present invention constitutes a display system (10) for alpha-numeric and graphic images. The system provides a signboard on which varying images of comparably large dimensions can be made to appear. The system comprises an input matrix (12), a display matrix (14), and a large number of optical conductors...http://www.google.co.uk/patents/US4839635?utm_source=gb-gplus-sharePatent US4839635 - Signboard for displaying optical images
