The characteristics of capacitive touch panels were examined via electromagnetic field numerical analysis, with focus on the comparison between self-and mutual-capacitive panels. The results indicate the need for an AC-voltage-applied shield electrode and a high-sensitivity self-capacitive panel. The results also highlight a spatial resolution issue and the electrical role of dummy electrodes in the mutual-capacitive panel.
We have proposed a configuration of single-layered touch electrodes for capacitive touch panel and a low-side selfcapacitive sensing circuit that can be adopted to large area touch screen . A 4.0-in capacitive touch panel which consists of large resistive electrodes and the driver circuit with the proposed method shows high touch sensitivity at high resistive electrodes.
We have devised a method that employs surface-and self-capacitive sensing principles for touch detection with a single-layered capacitive touch panel. In this method, a single electrode layer consisting of a stripe-shaped one-dimensional electrode array was used to enable multi-touch detection, and a capacitive sensing circuit that uses a trans-impedance amplifier was selected to simplify the circuit structure of the touch panel. The results indicate that the number of the panel fabrication processes and the amount of the touch electrode material required can be reduced by half by using the proposed method. ' 6
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