| 摘要 |
A touch detection system of a terminal device and a terminal device are provided. In the touch detection system, once the charging of the mutual-capacitor and the self-capacitor, the detection circuit can be multiplexed. That is, the capacitor charging/discharging circuit is connected to the amplifier, the charge in the self-capacitor or the mutual-capacitor is transferred to the output of the amplifier by the capacitor between the output and one input of the amplifier, and the other input of the amplifier is connected to a reference signal source, so that a signal processing unit can determine a touch on the capacitive touch screen based on the output voltage of the amplifier. It is unnecessary to use multiple circuits to detect the capacitances of the mutual-capacitor and the self-capacitor, so as to simplify the structure for detecting the touch of the customer on the capacitive touch screen in the terminal device. |
