CAPACITIVE TOUCH SYSTEM AND FREQUENCY SELECTION METHOD THEREOF
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United States of America Patent
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Issued Date -
May 12, 2016
app pub date -
Nov 12, 2014
filing date -
Nov 12, 2014
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Abstract
There is provided a capacitive touch system including a touch panel, a plurality of amplification units, a plurality of anti-aliasing filters and a control unit. The touch panel includes a plurality of driving electrodes and a plurality of sensing electrodes configured to form inductive capacitance. The amplification units have a high-pass cutoff frequency. The anti-aliasing filters have a low-pass cutoff frequency. The control unit is configured to control the high-pass cutoff frequency and the low-pass cutoff frequency to form an equivalent bandpass filter in a frequency scanning interval and adjust a center frequency of the equivalent bandpass filter to correspond to a plurality of predetermined driving frequencies.
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