Model of an Automatic Control System for Thermal Conditions of an LCD Panel in On-board Indication Equipment
Purpose: In modern avionics, the indication equipment is usually based on liquid crystal panels operating under harsh conditions. Ambient temperature value has a significant influence on the colorimetric reproduction characteristics of a panel. Therefore, the required thermal mode of an LCD panel mounted in the indication equipment unit should be stabilized during its operation. The purpose of this research refers to the problem of parametric identification of the automatic control system model which stabilizes the thermal mode of a liquid crystal panel. Methods: To solve the problem of model identification for a given automatic control system, methods of analyzing automatic control systems (ACS) are applied. The simulation was performed in Simulink environment within MathLab system. The theoretical analysis subject is the automatic system structure specified at the level of the automation functional elements. Results: A software tool is proposed for modeling an automatic control system for stabilizing the thermal mode of an LCD panel in avionics indication equipment. Theoretical and experimental graphics are obtained, depicting how the temperature depends on the time of the operation under the given conditions. Practical relevance: The results were obtained in the course of development work and can be used by developers of on-board indication equipment to perform circuit calculations and to estimate thermal conditions of LCD panels in operating mode.