Touch panel

Details Touch panel Touch panel

1986-01-15

1987-07-14

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340706, G08C 2100

Patent

active

046804293

ABSTRACT:
A touch panel has panel scanning signals selectively applied to the four sides of a touch sensing surface of the panel so as to establish alternating current voltage gradients in desired directions across the touch sensing surface. When the panel is touched, touch currents result and are utilized by a touch location circuit in determining the location of touch. The impedance touch current resulting from a user's touch may also be determined and used. The touch panel circuit automatically compensates for changes in impedance touch current, such as results when users touch the panel with ungloved and gloved fingers.

REFERENCES:
patent: 3497617 (1970-02-01), Ellis
patent: 4198539 (1980-04-01), Pepper

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