| 摘要 |
The present invention relates to a capacitance sensing circuit for a multi touch panel. The capacitance sensing circuit for a multi touch panel includes: a touch panel having an x-axis electrode and a y-axis electrode; a transmitting circuit unit for applying a transmit signal, which has a predetermined time-division period, to the x-axis electrode; and a receiving circuit unit for detecting differences in a capacitance component, which occur between the x-axis electrode and the y-axis electrode, when contact by a user occurs. The receiving circuit unit constitutes a current mirror based charge integrator circuit, and detects differences in a capacitance component, which occur between the x-axis electrode and the y-axis electrode of the touch panel, by integrating both a rising period and a falling period of a square transmit signal applied from the transmitting circuit unit, in order to detect a user's touch. The above configuration of the present invention may maintain a voltage value precisely after integration, be resistant to noise, be easy to manufacture, and have low power consumption. |
