Analytical Calculation for Capacitances of Electrode Patterns in Touch Panels

[摘要] Abstract In this paper, an accurate 3-dimensional (3-D) analytical solution is proposed to calculate the projective capacitances of touch panels. In this study, both simple and complex patterns were investigated for the calculation. We propose a partition strategy to divide a pattern into many rectangular or triangular sub-patterns. Each sub-pattern can be further cut into 2-D slices. The capacitance of a 2-D slice was then solved by our closed-form formulae. The total capacitance of a pattern was obtained by integrating up all the partial capacitances of the slices. In this study, the precision of our analytical method was examined by comparing the simulation results obtained from Q3DTM. The results of our method had a limited deviation from the simulation results while made the computation time from one hour or some by the commercial software down to just a few tens of sec by MatlabTM. In this study, the error is about 5% for simple patterns while the error was within 20% for a very complex pattern.

[学科分类] 电子、光学、磁材料

[关键词] touch panel;capacitor pattern;analytical solution;field-based calculation