The history of multi-touch technology dates back to 1982, when the University of Toronto developed the first finger pressure multi-touch display. Whereas today, Jefferson Y. Han, a research scientist for New York University, is one of the main developers of an "interface-free" touch-driven computer screen which is based on multi touch sensing.
The following website is a demonstration of how to build a multi touch screen and also shows what touch screens are generally made of:
http://feroz007.wordpress.com/2007/08/18/build-your-own-multitouch-display/
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