The LED display control system is a system that controls the correct display of the LED large screen according to user needs.
The online version is also known as the LED information release control system, which can control each LED terminal through the cloud system. The stand-alone version is also known as LED display controller and LED display control card. It is the core component of the LED display. It is mainly responsible for converting external video input signals or onboard multimedia files into digital signals that are easy to identify on the LED large screen. , so as to light up a device with a large LED screen, which is similar to the graphics card in a home PC.
The difference between the two is that the display in the PC is CRT/LCD, etc., while the display in this system is a large LED screen. According to the access signal mode, it can be divided into synchronous system and asynchronous system. Let’s take a closer look at “What are the different types of LED display control systems”
1. What are the different types of LED display control systems?
1. According to the way of display, the LED display system is divided into three categories
(1) Graphic display system
Generally, the LED display screen that displays graphics and text is called a graphic screen. The main feature of the graphic screen is that each light-emitting device in the LED dot matrix can only be turned on or off, and the intensity cannot be controlled, that is to say, this type of screen has no gray level control, so it cannot achieve full-color images and can only display monochrome Or two-color content, which is the cheapest of the three display systems.
(2) Image display system
The image display screen is relative to the graphic display screen, which refers to those display screens with gray scales, which display more vivid pictures. The main feature of the image screen is to use limited gray scale and color modulation to display Images with less demanding color and grayscale requirements.
The gray level is from 0 to 255. Different LED display products have different levels. The higher the gray level, the more colors can be controlled, so the picture quality is also better.
(3) Video display system
Compared with the second type of system that only displays static images, the third type of video display system is a control system based on the QWhuisi theory, which can receive video signals and display moving, clear, full-color LEDs for images. The display is called a video display.
Such a display usually needs to be used with a video playback box or a video processor, so the price will be much more expensive than the other two.
2. According to the control method, we divide the display system into two categories
(1) Communication display system
The communication display screen is an asynchronous display screen. The asynchronous mode means that the LED screen itself has the ability to store and play automatically. The edited text and non-grayscale pictures on the PC display information or the location code and picture of Chinese characters. Number, etc. and various control commands are transmitted to the LED screen controller through the serial port or other network interface, call various data information stored in the controller in advance, process the received instructions into the dot matrix data required by the display screen as required, and publish to the on the display. Such screens generally do not have multi-level grayscale display capabilities, and are mainly used to display text and simple graphic information, and can be multi-screen networked. This method must require a controller with a CPU to process the information.
(2) Real-time mapping screen system
The real-time mapping screen is a synchronous display screen. The basic function is to realize the real-time mapping of the computer screen content on the LED display screen, including the display of video images with the support of the multimedia card. Take the data from the featured port of the host graphics card or the video master card to take out the data to be displayed after the graphics card has been processed, and then do certain processing to the data and send it to the LED display. In this way, a controller with a CPU can be used, or even a hardware card can be realized.
The 256-level gray LED display system can make the LED display screen display synchronously with the computer, and make it achieve a high-performance display effect. The 256-level gray LED display control is composed of a multimedia card, a video controller, a long-line driver, a receiving card and a display unit.
The video controller obtains the digital display signal from the standard display interface of the multimedia card and converts it into the signal format required by the display screen. It can also obtain the control signal from the standard interface of the computer. The user completes the control of the LED display screen through the computer software. Adjustment, and making the display screen can adapt to different specifications of multimedia cards, with a high degree of compatibility.
3. Classification from the way of communication
(1) Wired communication method
A communication method using tangible physical media such as cables and optical fibers as a medium. As far as application is concerned, data transmission is generally performed through a dedicated channel, which is relatively expensive. It is believed that wired communication based on the public network will be more widely used in the future. Using Internet to transmit data is also one of the main methods used by this system.
However, the disadvantage of this method is also very obvious. If you want to change the content, you must use a data cable to connect to the computer. Therefore, whether it is debugging or changing information, professional personnel are required to operate.
(2) Wireless communication method
The method of sending information from the monitoring center through radio waves between the LED screen controller and the monitoring center within the communication distance. This method saves system investment, shortens the construction period, and reduces the possibility of system theft. This communication method is similar to the form of a mobile phone short message using GSM, GPRS, or CDMA network for transmission, and also using broadcast tower, using FM or AM mode for signal transmission and reception.
This method is relatively simple and convenient and is much more flexible. It can be replaced by mobile phones and other devices where the signal can be connected. Compared with the first type, it is suitable for general non-technical personnel to operate. The disadvantage is that the transmission information is susceptible to interference, and data may be lost. Therefore, the stability is not as good as the first category.
The above content is an introduction to “What are the different types of LED display control systems”, and I hope it will be helpful to people who want to understand this.