红外触摸屏通过发射接收红外光进行工作,对环境光照因素的变化比较敏感.在有外界强光照的环境中使用红外触摸屏会受到极大干扰,导致红外接收管接收到的光强发生异常,从而引起误动作.本文研究了采用高频红外光的发射与接收,以锁相放大方式滤除太阳光的干扰频段分量,实现了红外触控屏的抗直接照射的阳光干扰的方法与验证结果.此外,通过改进了锁相放大器的解调算法,去掉传统的锁相放大后级所必须的滤波电路,电路更加简洁、可靠.经硬件平台的实际验证,选频Q值可以达到145.985,并能在50 000 lx的光强下正常工作.该算法能够实现很好的选频和抗强光效果,达到抗干扰目的.
参考文献
| [1] | 张伟,郭勇.基于ARM的红外多点触摸屏设计[J].液晶与显示,2013,28(5):698-702.Zhang W,Guo Y.The design of infrared multi-touch screen based on ARM[J].Chinese Journal of Liquid Crystals and Displays,2013,28(5):698-702.(in Chinese) |
| [2] | 李文生,邓春健,吕燚.基于触摸显示屏的人机交互手势分析[J].液晶与显示,2011,26(2):194-199.Li W S,Deng C J,Lv Y.Interaction gesture analysis based on touch screen[J].Chinese Journal of Liquid Crystals and Displays,2011,26(2):194-199.(in Chinese) |
| [3] | 佳格科技推出创新的混合矩阵红外技术[J].现代显示,2012,134:30.The mixing matrix infrared technology which Standard technology put out[J].Advanced Display,2012,134:30.(in Chinese) |
| [4] | 张宏伟.多触点抗强光红外触摸屏的设计与验证[D].成都:电子科技大学,2009:27.Zhang H W.The design and verification of multi-touch and anti-light infrared screen[D].Chengdu:University of Electronic Science and Technology of China,2009:27.(in Chinese) |
| [5] | 张明.抗强光干扰的高精度红外触摸屏设计与实现[D].成都:电子科技大学光电信息学院,2008:23-24.Zhang M.The design and implementation of anti-light high-precision infrared touch screen[D].Chengdu:University of Electronic Science and Technology of China,2008:23-24.(in Chinese) |
| [6] | 李毅.可扩展抗强光红外触控模块设计与实现[D].成都:电子科技大学,2013:23-33.Li Y.Design and implementation of scalable,anti-light interference infrared touch module[D].Chengdu:University of Electronic Science and Technology of China,2013:23-33.(in Chinese) |
| [7] | 冯致礼.晶体滤波器[M].北京:宇航出版社,1987:488-501.Feng Z L.Crystal Filter[M].Beijing:Yuhang Press,1987:488-501.(in Chinese) |
| [8] | 董冠涛.红外线感应电子白板的设计与实现[D].长春:吉林大学,2009:27-33.Dong G T.Design and realization of electronic whiteboard based on infrared ray[D].Changchun:Jilin University,2009:27-33.(in Chinese) |
| [9] | 周烨.基于锁相放大技术的抗强光干扰红外触控技术的研究[D].成都:电子科技大学,2011:20-21.Zhou Y.The research of anti-light infrared touch technology based on lock-in amplifier technology[D].Chengdu:University of Electronic Science and Technology of China,2011:20-21.(in Chinese) |
| [10] | 高晋占.微弱信号检测[M].北京:清华大学出版社,2002:161-162.Gao J Z.Detection of Weak Signals[M].Beijing:Qinghua University Press,2002:161-162.(in Chinese) |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%