液晶显示屏与电容式触摸屏间的信号串扰抑制
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摘要
随着显示技术的不断发展,集成触摸屏的液晶显示(LCD)在日常生产与生活中得到了广泛的应用。良好的触屏显示在人机交互方式上扮演着重要角色。然而,外挂式触摸屏在薄化后,触控感测部件和LCD驱动部件之间的距离减小,造成两者之间更紧密的耦合,导致LCD对触摸屏的噪声干扰更加严重,造成误触摸情况发生。为此,我们通过本文研究发现,调节源极数据驱动IC的内置功能及数据信号的驱动方式,可有效改善噪声干扰问题。首先,根据TFT面板阵列的排布,针对性调节源极数据驱动信号,观察噪声干扰的程度。实验结果表明:降低源极数据驱动能力,或更改数据信号的驱动方式为H2Dot时,噪声最大的sub V-stripe画面下的噪声干扰峰值可下降75%。基于上述解决方案,达到了降低噪声干扰的目的,提供给用户更精准、灵敏的触控体验。
With the development of display technology,liquid crystal displays integrated with touch panels have been widely used in the daily production and life.Quality touch-integrated display panels play an important role in the human-computer interaction.However,the external touch panel is thinner and thinner,the distance between the touch sensor and LCD driver is reduced,resulting in a closer coupling among these two,which leads to more serious noise interference from LCD to touch panel.In this paper,we find out that the noise interference can be effectively improved by adjusting the function of source driver IC and changing the driving method of data.Firstly,according to the arrangement of TFT array,we adjust the source data driving signal,then observe the level of noise interference.The experimental results show that by reducing the power of the source data drive or changing the driving method of the data signal,the level of noise interference in the sub V-stripe pattern can be reduced by 75%.Based on the above solution,the noise interference is suppressed,which provides users more accurate and sensitive touch experience.
With the development of display technology,liquid crystal displays integrated with touch panels have been widely used in the daily production and life.Quality touch-integrated display panels play an important role in the human-computer interaction.However,the external touch panel is thinner and thinner,the distance between the touch sensor and LCD driver is reduced,resulting in a closer coupling among these two,which leads to more serious noise interference from LCD to touch panel.In this paper,we find out that the noise interference can be effectively improved by adjusting the function of source driver IC and changing the driving method of data.Firstly,according to the arrangement of TFT array,we adjust the source data driving signal,then observe the level of noise interference.The experimental results show that by reducing the power of the source data drive or changing the driving method of the data signal,the level of noise interference in the sub V-stripe pattern can be reduced by 75%.Based on the above solution,the noise interference is suppressed,which provides users more accurate and sensitive touch experience.
引文
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[10]李兵兵,黄子强.电容式多点触摸屏的器件设计及算法实现[J].液晶与显示,2011,26(2):216-219.LI B B,HUANG Z Q.Device design and algorithm implementation of capacitive multi-touch screen[J].Chinese Journal of Liquid Crystals and Displays,2011,26(2):216-219.(in Chinese)
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[13]CHENC P,CHUNG T C,GUO X J,et al.2-Face Viewable Liquid Crystal Display by In-Plane Switching[J].Molecular Crystals and Liquid Crystals,2011,544(1):232-236.
[14]CHEN C P,PREMAN SP,YOON T H,et al.Dual-mode operation of dual-frequency liquid crystal cell by horizontal switching[J].Applied Physics Letters,2008,92(12):123505.
[15]马群刚.TFT-LCD原理与设计[M].北京:电子工业出版,2011MA Q G.The Principle and Design of TFT-LCD[M].Beijing:Electronic Industry Publishing,2011.(in Chinese)
[16]吴琦.TFT-LCD驱动技术的研究[D].北京:北京交通大学,2008.WU Q.Study on the driving technology for TFT-LCD[D].Beijing:Beijing Jiaotong University,2008.(in Chinese)
[2]陈立权.触摸控制系统中自适应噪声防护算法研究[D].武汉:武汉大学,2014.CHENL Q.Research on adaptive noise migitation algorithm in touch control system[D].Wuhan:Wuhan University,2014.(in Chinese)
[3]周长发.基于RISC架构的HMI系统中触摸屏的研究[D].南京:南京理工大学,2008ZHOUC F.Research on touch screen in HMI system based on RISC architecture[D].Nanjing:Nanjing University of Science and Technology,2008.(in Chinese)
[4]张明.电容式触摸屏自适应扫描控制电路的研究与实现[D].成都:电子科技大学,2013.ZHANGM.Study and implementation of adaptive scan control circuits used in capacitive touch panel[D].Chengdu:University of Electronic Science and Technology of China,2013.(in Chinese)
[5]张利利,侯毅,傅博,等.触摸屏用双组分加成型有机硅液体光学胶水的研究[C]//中国平板显示学术会议.2016:1137-1142.ZHANG L L,HOU Y,FU B,et al.Preparation and performance study on additional organic sillicone liquid optical clear adhesive in touch panel[C]//China FPD Conference.2016:1137-1142.(in Chinese)
[6]陈烜,叶家聪.Oncell触控技术在车载中的应用[J].液晶与显示,2015,30(3):410-415.CHEN X,YE J C.Oncell touch panel technology in automotive[J].Chinese Journal of Liquid Crystals and Displays,2015,30(3):410-415.(in Chinese)
[7]张雪峰.触摸屏技术浅谈[J].现代物理知识,2008,16(3):43-45.ZHANG X F.Touch screen technology[J].Modern Physics,2008,16(3):43-45.(in Chinese)
[8]周自立.电容式触摸屏的多点解决方案[D].广州:华南理工大学,2012.ZHOU Z L.Multi-touch solutions of capacitive touch panel[D].Guangzhou:South China University of Technology,2012.(in Chinese)
[9]穆园园,郭小军,唐先柱.基于驱动电路的改善以降低液晶显示器对电容触摸屏的杂讯干扰[C]//2014中国平板显示学术会议论文集.南京:中国光学学会电子行业协会液晶分会,中国物理学会液晶分会,中国电子学会,2014:39-41.MU Y Y,Guo X J,TANG X Z.Reducing the LCD’s noise effect to capacitive Touch-screen based on optimizing the LCD’s driving circuits[C]//China FPD Conference.Nanjing:China Electronics Association,China Association of Liquid Crystals,China Society of Physics,China Society of Electronics,2014:39-41.(in Chinese)
[10]李兵兵,黄子强.电容式多点触摸屏的器件设计及算法实现[J].液晶与显示,2011,26(2):216-219.LI B B,HUANG Z Q.Device design and algorithm implementation of capacitive multi-touch screen[J].Chinese Journal of Liquid Crystals and Displays,2011,26(2):216-219.(in Chinese)
[11]ZHAN S W,WEI T C,LI B,et al.A touch sensor controller IC adopting differential measurement for projected capacitive touch panel systems[C]Proceedings of the IEEE12th International Conference on Computer and Information Technology.Chengdu:IEEE,2012:477-481.
[12]RUAN J Y,CHAO P C P,CHEN W D.A multi-touch interface circuit for a large-sized capacitive touch panel[C]//Proceedings of IEEE SENSORS2010 Conference.Kona,HI:IEEE,2010:309-314.
[13]CHENC P,CHUNG T C,GUO X J,et al.2-Face Viewable Liquid Crystal Display by In-Plane Switching[J].Molecular Crystals and Liquid Crystals,2011,544(1):232-236.
[14]CHEN C P,PREMAN SP,YOON T H,et al.Dual-mode operation of dual-frequency liquid crystal cell by horizontal switching[J].Applied Physics Letters,2008,92(12):123505.
[15]马群刚.TFT-LCD原理与设计[M].北京:电子工业出版,2011MA Q G.The Principle and Design of TFT-LCD[M].Beijing:Electronic Industry Publishing,2011.(in Chinese)
[16]吴琦.TFT-LCD驱动技术的研究[D].北京:北京交通大学,2008.WU Q.Study on the driving technology for TFT-LCD[D].Beijing:Beijing Jiaotong University,2008.(in Chinese)