触摸屏绑定用光学胶特性研究

摘要

针对液晶面板和触摸屏绑定后容易出现显示Mura的问题,提出了不同液晶原屏需选用不同光学胶或者不同绑定工艺的方法.首先,对液晶屏的结构进行等效简化,将其等效为:上偏光片、CF基板、液晶层、TFT基板以及下偏光片,并对不同液晶原屏的各部分参数进行测试.接着,根据实际尺寸建立仿真模型并将光学胶的参数代入进行仿真分析.热分析结果表明,不同的液晶原屏需要采用不同热力学参数的光学胶进行绑定.通过仿真得出结论,文中所用的液晶原屏1需采用弹性模量为1.65×108Pa以下、线膨胀系数为1.2×10-3m/℃以下的光学胶,而液晶原屏2需采用弹性模量为1.65×107Pa以下、线膨胀系数为1.2×10-3m/℃以下的光学胶.本文提出的光学胶的选用方法可操作性强,对实际生产中的良品率提高具有重要的意义.%Aiming at the problem of display Mura in touch LCDs,we put forward the method that different LCDs choose different optical adhesives or different bonding procedures.First of all,we put forward an equivalent simplification of the structure for the LCDs,the structure consists of up polarizer,CF substrate,liquid crystal equivalent layer,TFT substrate and down polarizer.and 2 LCDs are tested for mechanical characteristic parameters.Then,the simulation model is established according to the actual size.Furthermore,the simulation analysis based on the parameters of optical adhesive is performed.Results show that it is better to apply different optical adhesives with different thermodynamic parameters for individual LCDs.The simulation concludes that the optical adhesive with the elastic modulus under 1.65×108 Pa and the linear expansion coefficient under 1.2×10-3 m/℃ is suitable for LCD 1.The optical adhesive with the elastic modulus under 1.65×107 Pa and the linear expansion coefficient under 1.2×10-3 m/℃ is suitable for LCD 2.Such method to choose suitable optical adhesives for LCDs is feasible and provides a valuable reference for the improvement in actual production.