Study On Thermodynamic Equivalent Parameters Of Liquid Crystal Display Panel

With liquid crystal materials of several micrometer thickness filling inside two ITO glasses, liquid crystal cell takes use of the electrically-controlled- birefringence effect to display information. The changes of liquid crystal thickness will directly lead to abnormal display. LC cell installed on aircrafts and with the function of touch have to be bonded a special glass to become laminated structure. When used in high temperature ambient, the bonding LCD may present some display Mura, possibly caused by complicated structure, different expansion coefficients of individual components. It becomes necessary to study thermal displacements of bonding LCDs to try to avoid display Mura.With the complex structure of LCD, it’s difficult to measure its internal micro thermal deformation after bonding. As a result, researchers often simulate the thermal deformation of LCD under high temperature by FAE simulation analysis. Due to the complexity of the internal structure of the liquid crystal display panel and the different technologies which manufacturers use, it’s difficult to accurately establish the same simulation model with real modulus. More, since it’s difficult to accurately get the thermodynamic parameters of the components of the model, the error of the simulation results will be large, which can’t give meaningful guidance to the actual bonding process. Therefore, this paper proposes an equivalent processing method of LCD panel. We also put forward a method based on the combination of thermodynamic test and simulation fitting in this paper which will help get the thermodynamic parameters of bonding glass, CF substrate, TFT substrate, liquid crystal equivalent layer and optical adhesive. In ANSYS, the simulation model is established to calculate the deformation under high temperature and analyze the optical effect of the different typies of LCD and different values of thermodynamic parameters. By inputting the thermodynamic parameters obtained from the test into the finite element analysis model of bonding liquid crystal panel, we find that the simulation result is highly similar to the experimental result, which indicates that the LCD panel thermodynamic parameters determination method has better accuracy and can be applied in practical processing.