LED Substrate Fabrication
Original Publication Date: 1983-Sep-01
Included in the Prior Art Database: 2005-Feb-07
Described is a technique for fabricating LED (light-emitting diode) arrays using single-level metallization to provide both anode and cathode connections. High density linear arrays are possible. To fabricate a high density LED array, a plurality of multidiode array chips are mounted on a substrate, the substrates then being assembled to produce long, linear arrays. This is illustrated in Fig. 1. The substrates must provide anode connections (top), cathode connections (bottom), thermal conduction, and thermal expansion matched with the LED array chips. The substrate is fabricated by metallizing an alumina ceramic part and defining conductive paths by photoetching. The density of lines and contacts required for a high density array usually precludes using single-layer metallization for both anode and cathode connections.