Abstract: An optical device has a plurality of LED sources distributed at the nodes of a rectangular lattice and solid state bistable electronic circuits associated with each source for delivering a predetermined current to the source responsive to a temporary control signal applied to a now line corresponding to the source and for maintaining it until it is cut off by another signal.In a modified embodiment, a plurality of LED sources are associated to the same solid state circuit which has a column interface having several outputs connected to respective column lines for delivering signals representative of conditions to be given to the LED sources one row at a time and a row interface having several outputs connected to respective row lines for selecting the row to be controlled. The circuit is again arranged for maintaining each of the LED sources in energized condition after it has been energized by the column interface and until it is cut-off by a specific signal.