Answer: B, synchronous system and C, asynchronous system.
Answer analysis:
When discussing the classification of LED display control systems, we must first clarify the main functions and working modes of LED display control systems.
This type of system is mainly responsible for converting video signals, image signals or other types of signals into signals that can be recognized by LED displays, and controlling the LED lights on the display to light up or go out in a specific way, thereby displaying the information or image we want to convey.
Now, let's analyze the options in the question one by one:
A, full-color control system: This description focuses more on the color performance of the LED display, that is, the display can display full-color images or videos. However, it does not classify LED display control systems by working mode, but describes a technical feature. Therefore, option A does not meet the working mode classification required by the question.
B, synchronous system: The synchronous system refers to the display content of the LED display being synchronized with the computer or other signal source in real time. This system needs to receive and process data from the signal source in real time, and then convert the data into signals that the display can recognize for display. It clearly describes a classification by working mode.
C, asynchronous system: In contrast to the synchronous system, the asynchronous system does not rely on a real-time signal source. It usually stores the content to be displayed (such as text, pictures, etc.) in the control system of the display screen in advance, and then displays it according to the set program or time. This system does not need to be connected to the signal source in real time when working, so it also constitutes a classification based on the working method.
D. Single and double color control system: Similar to option A, this description focuses on the color performance of the display screen, rather than its working method. Single and double color control system refers to the display screen's ability to display monochrome or dual-color images or text, rather than a classification based on the working method.
In summary, the LED display control system is mainly divided into synchronous system and asynchronous system according to the working method. These two systems have significant differences in working principles, application scenarios, and required equipment.
Therefore, the correct answer is B, synchronous system and C, asynchronous system. In academic or technical discussions, synchronous and asynchronous are both important classification methods.