The rugged LCD used in high-temperature environments is prone to present Mura,which severely worsens display quality.To solve the problem,the paper proposes a method based on experiments and finite-element simulation to deeply analyze the high-temperature display characteristics of the rugged LCD.Thermodynamic simulations of common LCDs and rugged LCDs are firstly performed using the finite-element simulation software,and then the thickness changes of the LC layer are analyzed.Thermodynamic experiments are finally performed.The practical and simulation results show that:1) The liquid crystal layer has obvious change at the Mura position,and the Mura becomes severe with the change of the layer thickness;and 2) The rugged LCDs have higher possibility of Mura at high temperature,and Mura possibilities of LCDs from different manufacturers are different.To minimize the problem of Mura,more work should be done to screen the LCDs.