The asynchronous system and synchronous system in the LED display are two different control systems, each with unique characteristics and application scenarios.
The following is a detailed introduction to the two systems:
1. Synchronous system
Definition and working principle
Definition: The synchronous system, as the name implies, is a control method for synchronously displaying the LED display with the computer monitor. This system can map the image on the computer monitor in real time to ensure that the content on the display is exactly the same as the content on the computer monitor.
Working principle: The synchronous system completely synchronizes the captured image with the computer desktop by collecting the high-definition signal of the computer graphics card in real time. It maps the image on the computer monitor in real time with a point-to-point update rate of at least 60 frames per second, thereby realizing the real-time display of dynamic content.
Features
Real-time: The synchronous system can display videos, graphics, notifications and other content in real time, meeting application scenarios with high real-time requirements.
Rich expression: Due to synchronous control, the display can display multi-grayscale colors to achieve multimedia advertising effects.
Complex operation: The operation of the synchronous system is relatively complex and requires professional technicians to set up and maintain.
High price: Due to high technical requirements, the cost of the synchronous system is relatively high.
Dependence on computer: The content of the display screen is completely synchronized with the computer monitor. Once the computer is turned off or the communication is interrupted, the display screen will also stop displaying.
Application scenarios
* The synchronous system is mainly suitable for places where dynamic video or graphic information needs to be displayed in real time, such as TV stations, large-scale event sites, shopping malls, etc.
2. Asynchronous system
Definition and working principle
Definition: Asynchronous system, also known as offline control system or offline card, is mainly used to display text, symbols, graphics or animation. Unlike the synchronous system, the asynchronous system edits the content on the computer, pre-places it into the frame memory of the LED screen through the RS232/485 serial port, and then plays it independently.
Working principle: The working principle of the asynchronous system is to first edit the content to be played on the computer, and then send the content to the control card of the LED display screen through the transmission medium (such as network cable, data cable, U disk, etc.). The control card stores the received content in the frame memory and independently controls the playback of the display screen.
Features
Simple operation: The operation of the asynchronous system is relatively simple, and users can easily edit and update the display content.
Low price: Due to the low technical requirements, the cost of the asynchronous system is relatively low.
Wide range of applications: Asynchronous systems are suitable for a variety of application scenarios, including outdoor billboards, information display screens, etc.
Regional control: It can realize regional control of display screen content, with high flexibility.
Independent playback: Even if the computer is turned off or the communication is interrupted, the LED display can display independently, but the amount of playback information is limited by the storage capacity of the control card.
Application scenarios
* Asynchronous systems are suitable for places that do not require high real-time performance but need to flexibly display static or simple dynamic content, such as bus stops, shopping mall signs, etc.
In summary, the synchronous system and asynchronous system in the LED display have their own advantages and limitations.
Users should weigh and choose according to their specific needs and budget when choosing.