Tpk Touch Solutions Inc.

Yi-Kun Li

Jui-Jung Chiu

A touch sensing circuit includes an alternative current (AC) source, a voltage division circuit, and a processing circuit. The voltage division circuit receives an AC signal outputted from the AC source and includes a first branch and a second branch on a touch sensing glass, wherein the first and second branches are adjacent to each other. The processing circuit is connected to the voltage division circuit for determining position of a touch point according to the voltages of the first branch and the second branch. In a preferred embodiment, the first branch comprises a first capacitor and a first voltage division resistor connected to the first capacitor, and the second branch comprises a second capacitor and a second voltage division resistor connected to the second capacitor.

Touch sensing circuit and touch point detecting method thereof

An open circuit detecting system configured to connect to an object circuit for getting an electrical signal through a virtual ground induced by characteristic impedance of a parasitic capacitor and determining whether the object circuit is open according to the electrical signal.

Growing community of inventors

Hsinchu, Taiwan

Yi-Kun Li