A multiplexer for a biometric apparatus having at least fifty thousand piezo ceramic sensor elements arranged in a two-dimensional array on a pitch spacing equal to or less than approximately two hundred microns. The multiplexer includes a plurality of first and second orthogonal conductors. Each of...http://www.google.de/patents/US6812621?utm_source=gb-gplus-sharePatent US6812621 - Multiplexer for a piezo ceramic identification device
