Large-size liquid crystal display (LCD) modules for airborne applications have the characteristics of high brightness and high power consumption. In order to reduce their dynamic power consumption, a dynamic backlight control system for large-size airborne display modules is introduced. The system adopts light emitting diode (LED) dynamic backlight control technology to improve dynamic display effect and achieve energy saving by dynamically adjusting the backlight. A detailed introduction to the hardware circuit and software design algorithm of the system is provided, and experimental verification is conducted. Results show that the system can effectively improve the dynamic display effect of the airborne display module and significantly reduce dynamic power consumption.