| 摘要 |
<p>A touch sensing device has a plurality of touch sensing electrodes (X1 to X3, Y1 to Y3) and a touch sensing circuit (20, 115) to which the touch sensing electrodes (X1 to X3, Y1 to Y3) are sequentially and selectively connected in turn. The touch sensing circuit (20, 115) has an oscillator (22) which supplies an AC signal to the selected touch sensing electrode (e.g. X1). The device has a buffer circuit (32) which supplies an AC signal, corresponding to the AC signal from the oscillator (22) but isolated therefrom, to the non-selected electrodes (e.g. X2, X3, Y1 to Y3). Thereby the non-selected electrodes (X2, X3, Y1 to Y3) are clamped to substantially the same potential as the selected electrode (X1) and adverse effects arising from impedance between adjacent electrodes and/or surface contamination are mitigated or removed.</p> |
