Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Reexamination Certificate
2004-03-19
2010-12-21
Suhol, Dmitry (Department: 3714)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
C463S016000
Reexamination Certificate
active
07855717
ABSTRACT:
In a method for determining a position of a touch on a touch screen, a first sinusoidal signal is provided to an electrode on a touch screen, the first sinusoidal signal having a frequency. A signal flowing from the first electrode is sensed to generate a sensed signal, and the sensed signal is multiplied by a second sinusoidal signal to generate a first multiplied signal, the second sinusoidal signal having the frequency, the second sinusoidal signal having a phase. The first sensed signal is also multiplied by a third sinusoidal signal to generate a second multiplied signal, the third sinusoidal signal having the frequency, the third sinusoidal signal having a phase different from the phase of the second sinusoidal signal by 90 degrees. The first multiplied signal is filtered to generate a first filtered signal, and the second multiplied signal is filtered to generate a second filtered signal. An estimated touch position is generated based on the first filtered signal and the second filtered signal.
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Mattice Harold E.
Wilder Richard L.
IGT
Rustemeyer Malina K
Suhol Dmitry
Weaver Austin Villeneuve & Sampson LLP
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