Device and method for detecting multiple touch points

Details Device and method for detecting multiple touch points Device and method for detecting multiple touch points

2009-05-31

2011-12-06

Sherman, Stephen (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C178S018050

Reexamination Certificate

active

08072441

ABSTRACT:
Techniques for detecting multiple touch points for touch screens are disclosed. A touch screen includes a first conductive layer and a second conductive layer, each conductive layer having a positive terminal and a negative terminal. Efficient operations of detecting multiple points on the touch screen are described using various voltage/currents differences from the positive and negative terminals of the first and second conductive layers.

REFERENCES:
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patent: 2005/0104867 (2005-05-01), Westerman et al.
patent: 2008/0062139 (2008-03-01), Hotelling et al.
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patent: 2009/0009487 (2009-01-01), Nishitani et al.
patent: 2009/0174676 (2009-07-01), Westerman
patent: 2009/0184939 (2009-07-01), Wohlstadter et al.
patent: 2009/0189877 (2009-07-01), Washino et al.
patent: 2009/0244031 (2009-10-01), Westerman et al.

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