Touch position coordinate detecting system

Details Touch position coordinate detecting system Touch position coordinate detecting system

2007-06-12

2007-06-12

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C345S177000, C178S018040

Reexamination Certificate

active

10866944

ABSTRACT:
A touch position coordinate detecting system is provided that is based on surface acoustic waves and includes arrays of reflective patterns between a touch region of a touch panel. An initial burst that includes two frequency components is sent on the panel. The reflective arrays include two sub-arrays centered respectively at the two frequencies. A touch on the panel involves an absorption of the acoustic waves traveling in the region of the panel, and provides a localized damping in a time output signal. A time localized damping is detected for each reflected frequency components, thereby enhancing the signal-to-noise ratio of the system.

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patent: 6633280 (2003-10-01), Matsumoto et al.
patent: 7061475 (2006-06-01), Kent

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