Answer: Digital clock, text, special characters.
Answer analysis: The simple asynchronous control system of LED display can only display digital clock, text, and special characters.
The simple asynchronous control system of LED display can mainly display the following contents:
1. Digital clock: It can display the current time, including hours, minutes, etc., which is suitable for scenes that need to display time information.
2. Text: It can display various text information, including Chinese, English, numbers, etc., which is suitable for scenes that need to display text content, such as announcements, notices, etc.
3. Special characters: In addition to common text and numbers, some special characters can also be displayed, such as punctuation marks, graphic symbols, etc., which increases the diversity and flexibility of display.
It should be noted that the functions of the simple asynchronous control system of LED display are relatively basic, and are mainly suitable for scenes with low requirements for display content.
If you need to display more complex graphics, animations or videos, you may need to use a more advanced control system, such as a graphic asynchronous control system or a synchronous control system.
In addition, with the continuous development of technology, the functions of the LED display control system are also constantly expanding and improving.
For example, some advanced control systems also support functions such as timed power on and off, temperature control, humidity control, and the ability to control the display screen content in different areas, making the application of LED display screens more extensive and flexible.