If you want buld a multi-touch system but have only a conventional touch screen, consult following references:
Capacitive touch screens with projective matrix array configuration
- G. G. Hollemans et al. (Koninklijke Philips Electronics, N.V.), "Use of a two finger input on touch screens," US2007/0252821 A1, Jun. 17, 2005.
- E. L. Grivna (Cypress), "Multi-axial touch-sensor device with multi-touch resolution," US2008/0150906 A1, Jun. 26, 2008.
Resistive touch screens
- N. Matsushita et al., "Dual touch: a two-handed interface for pen-based PDAs," UIST2000, pp. 211-212, 2000.
- B. O. Geaghan (3M), "Touch panel system and method for distinguishing multiple touch inputs," US2006/0139340 A1, Jun. 29, 2006.
Surface capacitive and surface acoustic wave touch screens
- B. O. Geaghan (3M), "Touch panel system and method for distinguishing multiple touch inputs," US2006/0139340 A1, Jun. 29, 2006.
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