Touch sensing device

Details Touch sensing device Touch sensing device

G - Physics

08

B

340/124

G08B 1/08 (2006.01) H03K 17/96 (2006.01)

Patent

CA 1220834

ABSTRACT In touch sensing keyboards which use the capacitance of the human operator to vary the characteristics of a resonant circuit thereby inputting data corresponding to a specific keyboard electrode touched by the operator, problems arise because the "steady state" capacitance varies from electrode to electrode. The sensing circuits may, as a consequence, fail to identify a touch condition in respect of one or more of the keyboard positions. The invention overcomes this by compensating for the capacitance variations basically by providing a ROM which switches in a different compensating capacitance as necessary for each specific keyboard location.

427020

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