Analysis Of Equivalent Models Of The Liquid Crystal Layer In LCD

LCD (liquid crystal display) is applied numerously in various fields, so higher requirements are put forward for its performances in variable conditions, such as vibration, high or low temperature. To meet these requirements, designers are willing to enhance the robustness of LCD through various ways and research the LCD under temperature. The structure of LCD is complex, and there are huge differences between the thicknesses of the liquid crystal layer and substrate glass which make the researches of LCD become difficult.This paper aims at making the non-uniform liquid crystal layer which is composed of glass spacers and liquid crystal equivalent to a uniform orthotropic material layer. The method of mechanics of composite materials is used for simplifying the distribution of spacers in the liquid crystal layer, and the equivalent model of the liquid crystal layer is established. The finite element software ANSYS is used for analyzing the2D and3D models of the liquid crystal layer. The material parameters of the equivalent layer are determined and the theoretical and finite element results are compared. Based on the finite element method (FEM), the simplified models of the LCD are established for verifying the validity of the equivalent model of the liquid crystal layer. Finally, the LCD models which consist of orthotropic and isotropic liquid crystal layers are established. The thermal stresses and displacements in these two models are compared.The results show that the orthotropic equivalent model of the liquid crystal layer has some errors near edges under force but it is valider under temperature. In the thermal stress analysis of LCD, there are some differences between orthotropic and isotropic equivalent models of the liquid crystal layer for the stress σx and displacement w.