Touch pad and position detecting circuit and method thereof

Details Touch pad and position detecting circuit and method thereof Touch pad and position detecting circuit and method thereof

2007-12-25

2007-12-25

Awad, Amr A. (Department: 2629)

Telegraphy

Systems

Position coordinate determination for writing

C178S018050, C345S174000

Reexamination Certificate

active

10709262

ABSTRACT:
A touch pad and a position detecting circuit and method thereof are provided. The touch pad uses a waveform generator to generate an input signal; the input signal is capable of gradually moving a position of a zero voltage on the sensing pad in a predetermined direction. The touch pad also uses the zero voltage detector to detect when a zero voltage of the sensing signal of the sensing pen occurs so as to determine the position of the sensing pen on the sensing pad. Hence, the analog-to-digital converter is not required. Therefore, the resolution can be easily expanded, and the cost, the preciseness, and the specification can be easily controlled.

REFERENCES:
patent: 3875331 (1975-04-01), Hasenbalg
patent: 4055726 (1977-10-01), Turner et al.
patent: 5113041 (1992-05-01), Blonder et al.

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