电容触摸屏的坐标定位分析  

Analysis on coordinate positioning of capacitive touch panel

作　　者：朱维安[1] 郑寿云[1] 陈莉[1] 

机构地区：[1]汕头大学物理系,汕头515063

出　　处：《电子测量技术》2009年第5期13-16,共4页Electronic Measurement Technology

摘　　要：描述了电容触摸屏直边形电极、直角形电极和矩形框电极的坐标定位算法。在忽略电极的电阻时,构建二维电容触摸屏的等效电路,推导了三种电极输出的触摸电流,用MATLAB计算电容触摸屏的坐标值,绘制了计算的坐标点图和位置误差图。结果表明:直边形电极、直角形电极和矩形框电极电容触摸屏的最大线性度分别是11.27%、23.91%和0.03%;线性度小于或等于1%的触摸面积分别是1mm2、9mm2和2500mm2;与实际的实验结果对比表明,电极是影响电容触摸屏坐标定位的重要因素。Methods for coordinate positioning are given and described in the tetragon, the right-angle and the square electrode of the capacitive touch panel. When electrode-resistance was ignored, touching current output formula was analyzed by analyzing two dimensional equivalent circuits on capacitive touch panel. Coordinate calculation, coordinate- map and error-map of the capacitive touch panel was solved by MATLAB. The maximum linearity of them are 11.27%, 23. 91% and 0. 03%, the area of the linearity within 1% are 1 mm2, 9 mm2 and 2 500 mm2. Finally, the experiment result is the electrode structure effected the coordinate positioning on capacitive touch panel.

关 键 词：电容触摸屏 电极形状 坐标定位 位置误差 线性度 

分 类 号：TP334.2[自动化与计算机技术—计算机系统结构] TP391.7[自动化与计算机技术—计算机科学与技术]