Answer: B. Module, C. Power supply, D. System card (or receiving card, control card).
Answer analysis: The LED display cabinet is the basic unit that constitutes a large LED display. It integrates multiple key components to ensure the normal operation and display effect of the display. For the given options, we can analyze it like this:
A. Wire: Although wire plays an important role in the assembly and connection of LED display, it is generally not regarded as the main component of the LED display cabinet. Wire is mainly used to connect the various components inside the cabinet and the signal and power transmission between cabinets. Therefore, this option is not the main component of the cabinet.
B. Module: The module is one of the core components of the LED display cabinet. It consists of multiple LED lamp beads (or pixels) and is responsible for displaying images and video content. The module is usually designed according to certain specifications and sizes, which can be easily installed inside the cabinet and driven and displayed by the control system. Therefore, this option is correct.
C. Power supply: The power supply is an indispensable component in the LED display cabinet. It is responsible for providing a stable power supply to various components inside the cabinet (including modules, control systems, etc.). The performance and stability of the power supply directly affect the display effect and service life of the display. Therefore, this option is also correct.
D. System card (or receiving card, control card): The system card is the bridge between the LED display control system and the display cabinet. It is responsible for receiving signals from the control system and converting them into a signal format that the module can recognize, thereby controlling the display content and effect of the module. The system card plays a vital role in the display process of the display. Therefore, this option is also correct.
In summary, the main components of the LED display cabinet include modules, power supplies, and system cards. These components work together to ensure that the LED display can operate normally and stably and present high-quality display effects. Therefore, the correct answers are B, C, and D.