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为了探究加固液晶屏高温下热应力影响,建立了基于ANSYS的液晶屏复合结构的有限元分析模型,模拟分析了二维模型等效应力和液晶层上边界Y方向应力的分布情况。仿真结果表明,当环境温度上升到70℃,胶层中气泡和裂纹附近会发生应力集中,液晶盒上边界也会发生相应位置Y方向应力集中。将三种光学胶实际测试的力学数据代入模型分析发现,光学胶的弹性模量和热膨胀系数越大,引起的应力集中也越明显。基于模拟分析,胶层中含有裂纹时液晶屏所受应力最大,因此加工中应避免胶层出现裂纹。在对液晶屏粘贴ITO玻璃时,应该选用弹性模量和线膨胀系数较小的光学胶。
In order to explore the effect of thermal stress on the LCD panel, a finite element model of the liquid crystal panel composite structure based on ANSYS was established. The distribution of the equivalent stress in the two-dimensional model and the stress in the Y direction at the upper boundary of the liquid crystal layer was simulated. The simulation results show that when the ambient temperature rises to 70 ℃, stress concentration will occur near the bubbles and cracks in the glue layer, and stress concentration will occur in the Y direction at the upper boundary of the liquid crystal cell. Substituting the mechanical data of the three kinds of optical adhesives into the model analysis, it is found that the greater the elastic modulus and thermal expansion coefficient of optical glue, the more obvious the stress concentration is. Based on the simulation analysis, the cracks in the adhesive layer LCD panel suffered the most stress, so the processing should avoid cracks in the adhesive layer. When attaching ITO glass to the LCD screen, an optical glue with a lower elastic modulus and a smaller linear expansion coefficient should be selected.