摘要
电阻式触摸屏在触摸力度较轻时会引起误操作,导致触点坐标判断不准确,系统灵敏度不高。在AT91SAM9261和ADS7846驱动控制电路基础上,给出了WinCE 5.0下的四线电阻式触摸屏驱动程序设计;另外为提高系统对触摸力度的鲁棒性,通过ADS7846检测触摸压力大小,并加入压力阈值判定去除无效点击。测试结果表明,新算法可有效提高坐标精度,尤其可大大减少因触摸力度较轻而产生的误操作。
Lesser intensity of touching to resistive touch-screen will cause misoperation, inaccurate contact judgment and low sensitivity. On the basis of AT91 SAM9261 and touch-screen controller ADS7846, the driver of touch-screen is designed in WinCE 5.0 environment. Furthermore, in order to remove invalid click and im- prove the accuracy of contact coordinates, touch pressure measurement and threshold decision procedure are a- dopted. Test results show that the adoption of pressure judgment increases the accuracy of gently touching coordinates and improves system adaptability to touch intensity.
出处
《测控技术》
CSCD
北大核心
2013年第6期17-19,共3页
Measurement & Control Technology
基金
辽宁省沈阳市科技局资助项目(1091100-2-00)
