TOUCH SENSING CIRCUIT CAPABLE OF ADJUSTING RECEPTION FREQUENCY BAND, AND TOUCH SENSING SYSTEM HAVING SAME
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United States of America Patent
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Issued Date -
Dec 11, 2014
app pub date -
Dec 28, 2012
filing date -
Dec 28, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention introduces a touch sensing circuit that adjusts a reception frequency band, which adjusts a width of a reception frequency band of a driving signal applied from a driving electrode of a touch screen panel and transferred to a reception electrode of the touch screen panel. The touch sensing circuit adjusts the width of the reception frequency band of the driving signal, which is applied from the driving electrode of the touch screen panel and transferred to the reception electrode of the touch screen panel, by using a high pass filter prepared in the form of a differentiator and a low pass filter prepared in the form of an integrator. In the present invention, resistance values of a plurality of embedded resistors and capacitance of a capacitor are adjusted, so that a driving signal is selectively received according to frequencies, and a received driving signal is amplified with a predetermined amplitude. Accordingly, since a separated filter for removing a noise component included in the driving signal is not required, a system is simplified.
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