Touch panel with automatic frequency control

Details Touch panel with automatic frequency control Touch panel with automatic frequency control

G - Physics

08

C

340/135.1

G08C 21/00 (2006.01) G06F 3/033 (2006.01)

Patent

CA 1273078

TOUCH PANEL WITH AUTOMATIC FREQUENCY CONTROL Abstract of Disclosure 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 signals result and are utilized by a touch location circuit in determining the location of touch. The impedence touch current resulting from a user's touch may also be determined and used. The touch panel circuit automatically adjusts the frequency of the applied panel signals to shift this frequency away from fixed frequency interference spectra, such as due to cathode-ray tube flyback signals, in the environment in which the touch panel is used. The touch location thereby minimizes the effects of such spectra on touch location determinations.

542055

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