Patent ID: 7932524

Claim:
A transparent device for the display of information superimposed on a background, said device comprising: a plurality of LED sources, addressable individually or in groups through a series of conductive paths deposited on a transparent underlayer and connected to a control electronics, wherein said LED sources are integrated in the form of dice, said dice comprising elements obtained by dividing up a semiconductor wafer and without package, on said transparent underlayer via technologies of a chip-on-board type; wherein each LED is positioned at a point of crossing-over between a row and a column, in such a way as to be addressable individually via application of an appropriate potential difference between said row and said column; wherein said columns of said array comprise continuous column conductive paths of a same material deposited on said underlayer, and said rows of said array include row stretches of row conductive path deposited on said underlayer between the columns, the row stretches connected to each other across the columns through bridging stretches of metal wire having ends of said bridging stretches connected by wire-bonding technology to said row stretches of row conductive path, said stretches of metal wire avoiding electrical connection with said column conductive paths; wherein the electrical contacts made on each die through wire bonding and said stretches of metal wire are englobed within a protective layer; wherein said underlayer is transparent and said protective layer is a layer of transparent resin; and each die of said dies electrically connected to a respective column of said columns by a stretch of metal wire bonded to a metal pad connected to, and at least in part superimposed on, the respective column.