Answer: Display unit board, strip screen card, switching power supply, HUB board.
Answer analysis:
LED asynchronous screen generally consists of the following main parts:
1. Display unit board (module): This is the basic display unit of the LED display screen, which consists of multiple LED lamp beads and driving circuits, responsible for emitting light and forming images or text. The display unit board can work alone, or multiple pieces can be spliced together to form a larger display screen.
2. Strip screen card (or receiving card): The strip screen card is responsible for receiving data from a computer or other signal source, and converting it into a signal that the LED unit board can recognize to control the display of the LED lamp beads. It is one of the key components for realizing asynchronous control.
3. Switching power supply: Provides stable voltage and current for the LED display screen and its control system to ensure that the display screen can work properly. The selection of the switching power supply needs to be determined according to the power and safety requirements of the display screen.
4. HUB board (optional): In some cases, a HUB board may be used to extend the distance of signal transmission or increase the stability of signal transmission. The HUB board can act as a signal relay station to amplify or redistribute the signal from the strip screen card and then transmit it to more display unit boards. However, it should be noted that the HUB board is not a necessary component of all LED asynchronous screens, but is optional according to specific needs.
In summary, LED asynchronous screens are generally composed of display unit boards (modules), strip screen cards (or receiving cards), switching power supplies, and optional HUB boards. These parts work together to realize the asynchronous control and information display functions of LED display screens.