为了减少投射电容式触摸屏互电容的检测数量,提出了一种自适应检测算法,并对该算法进行分析和验证.将整个投射电容式触摸屏抽象成一个网格,互电容为网格横纵的交错点.分析网格横纵2个方向变阈值的自适应扫描,并将其与逐行扫描法进行对比.设计出以FPGA为控制核心、外加检测电路的自适应检测系统对该算法进行验证.实验结果表明,对电极间距为1 mm,驱动区为71×54的投射电容式触摸屏,在识别点数分别为3、2、1时,与采用传统的逐行扫描法相比,采用自适应检测法需要的检测次数分别相应地减少为1/5.0、1/6.5、1/10.4,有效地缩短了触摸信息的检测时间,对投射电容式触摸屏在大尺寸方向的发展与应用有积极意义.
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