结构参数对电容触摸屏线性度的影响

用ANSYS软件对二维电容触摸屏的结构参数进行计算和分析,讨论了结构参数对位置线性度的影响,并通过测试实验进行了验证.结果表明:触摸面电阻率与电极电阻率的比值γ会影响矩形电极结构电容触摸屏的线性度,γ越大,电容触摸屏的线性度越好,其合适的取值范围是γ>100;调整电容触摸屏位置坐标换算式中的参数κ能改善电容触摸屏的线性度;由负载电阻、电极结构和不均匀触摸面所引起的位置误差不可忽略.

Effects of Structure Parameter on the Linearity of Capacitive Touch Panel

The two-dimensional capacitive touch panel is calculated and analyzed by ANSYS, and the influences of the capacitive touch panel construction, electrical parameters and the load on the device linearity are discussed. The conclusions are as following： It is the ratio（γ） of the touching-surface resistance to the electrode resistance that influenced the linearity of the square bordered capacitive touch panel, and the higher the ratio, the better the linearity. The appropriate value is γ 〉 100. The optimal factor r in the position formula effect on the linearity of capacitive touch panel, and the load, structure and the flatness of capacitive touch panel will cause additional position error.