Design of High-Precision Capacitive Touch Electrodes and Coordinate Detection Algorithm

The traditional capacitive touch electrodes have the problems of low noise resistance and low resolution, and the traditional touch detection corresponds to a larger circuit area and higher power consumption. In this paper, we proposed a novel design of capacitive touch electrode pattern with the detection method. Based on the optimized of general rectangular or square touch electrode pattern, the touch position could be obtained by the quotient of the sum of the sensing capacitance value multiplied with the corresponding touch coordinates and the sum of the sensing capacitance value. The general calculation of the touch point coordinates in a planar Cartesian coordinate system is adjusted to a three-axis symmetric coordinate system to calculate the touch coordinates. The simulation and evaluation results show that capacitive touch electrodes and coordinate detection algorithm proposed in this paper have better touch effect. The new touch capacitance detection graphics, combined with the optimization design of the detection method, can improve the anti-interference ability and resolution of the detection and reduce the power consumption of the system.