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Gravity mura is a typical defect in large-sized LCD which causes non-uniform shades at underside. In this investigation, a mechanical model was proposed and analyzed under gravity and thermal expansion. The stiffness and arrangement of photospacers were considered in this model. Furthermore, the simulation results were obtained to modify the analytical model properly. The analytical results facilitated the establishment of the design criteria of LCD cells for which the gravity mura could be restrained or eliminated.

An analytical model of an LCD cell under gravity and local loading to prevent permanent deformation of the photospacers and the occurrence of gap mura will be presented. The analytical model is established from the Winkler model, which is composed of a beam and a series of springs. The analytical solutions have been simplified under specific assumptions and modified through threedimensional simulations in order to improve their accuracy. Therefore, the analytical model can be applied to the design of an in-cell touch panel while considering the local loading due to touch or probe testing and contact conditions of photospacers. This analytical model can be used to provide instant design criteria for photospacers without considerable simulation and experimental data and to enhance the reliability of the LCD cell structure. FIGURE 1 -(a) LCD cell under gravity and local loading; (b) analytical model of the LCD cell.

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This article presents an analytical model of LCD cell under gravity and loading to predict the mechanical behavior of LCD cell and permanent collapse of photospacer. This analytical model can be used to provide instant design criteria for photospacer and to enhance the reliability of LCD cell structure.