摘要
分析了投射电容式触摸屏的工作原理,概述了国内外现有触控方案,重点分析了支持多点触控的互电容信号检测方案。在此基础上,提出了单线驱动-差分感应的新型信号检测方案。该方案采用差分感应的方式,可以放大自电容和互电容的变化值,具有消除失调电压和抑制电源噪声的优点,可提高信噪比,并消除了"鬼点"的影响。
The work principle of projected capacitive touch panel screens is analyzed and the existing touch sensing schemes are summarized in this paper.The detailed analysis of mutual capacitance sensing scheme supporting multi-touch is given.A novel sensing scheme of single-end driving and differential sensing is proposed in this paper.The proposed scheme adopts the differential sensing to amplify the variation of self capacitance and mutual capacitance.
出处
《工业控制计算机》
2015年第6期155-156,160,共3页
Industrial Control Computer
基金
航空科学基金项目(2013ZA31001)
中航工业计算所创新基金项(CXXM12072-16)
关键词
投射电容式触摸屏
互电容
自电容
差分感应
projected capacitive touch panel
mutual capacitance
self capacitance
differential sensing
