LED Display control system: let the big screen be smart and simple, let all screens be interconnected

LED display control system, also known as an LED display controller and LED display control card. It is the core component of the LED display screen, mainly responsible for receiving the picture and video display information from the computer serial port or DVI interface, placing it into the frame memory, and generating the serial display data and Scan control timing.

LED display asynchronous control system

LED display asynchronous control system is also called LED display offline control system or offline card. It is mainly used to display various characters, symbols, and graphics or animation. The screen display information is edited by the computer, and the frame memory of the LED display screen is pre placed through the RS232 / 485 serial port, and then displayed and played one by one. The display mode is colorful and varied. Its main features are simple operation, low price and wide range of use. LED display simple asynchronous control system can only display digital clock, characters, and special characters. In addition to the functions of a simple control system, the asynchronous control system for graphics and text of LED display screen has the biggest feature that it can control the contents of the display screen in different regions. Support analog clock display, countdown, picture, table, and animation display. It has the functions of timing switch, temperature control, and humidity control.

LED display synchronous control system

LED display screen synchronous control system is mainly used to display video, text, and notifications in real time. It is mainly used for indoor or outdoor full-color large screen displays. The LED display screen synchronization control system controls the working mode of the LED display screen to be basically equivalent to the monitor of the computer. It maps the images on the computer monitor in real-time at the update rate of at least 60 frames/second. It usually has the color display ability of multi-gray levels and can achieve the effect of multimedia advertising. Its main features are real-time, rich expression, complex operation, and high price. A set of LED display synchronization control systems is generally composed of a sending card, a receiving card, and a DVI display card.

Some people believe that the control system determines the content and function of the LED display. For example, in the capture system of the transportation system, the display screen is only a window, and the most important links – data processing and communication are completed by the control system, which plays the most important role. This view is quite similar to ours. The display screen is equivalent to our eyes, and the control system is our brain. It can be seen that the importance of the control system to the LED display is really unnecessary.

The early control system has obvious defects in performance and reliability, but now it has been greatly improved. But now it is the Internet + era. While the market pursues reliability and stability, it also puts forward high requirements for convenience and intelligence. For example, how to make good use of big data, cloud computing, and the Internet of things in the LED display industry will be another focus of the industry development.

Since the array control system is adopted, it can effectively reduce the brightness loss of the display screen caused by the control system used to generate grayscale. According to comparative calculation, the system loss of the traditional “centralized control system” is between 30% and 40%, and the system loss of the “array control system” is between 8% and 10%. The reduction of the control system loss is conducive to improving the brightness of the display screen, or under the same brightness conditions, Reducing the current of the display screen to achieve the effect of energy saving and consumption reduction.

In order to improve the reliability of the screen and increase the convenience of maintenance, Yuanheng optoelectronics has developed a single-point detection technology for the display screen. Usually, LED pixels are detected by visual inspection (i.e. human eyes see whether they emit light according to the debugging program) before the LED display panel leaves the factory. When viewing LED pixels for a long time, it is inevitable that there will be some visual fatigue, missed judgment, or misjudgment, and its working efficiency is not high. Using the single point detection function of the screen, the working state of the pixels can be judged by running the corresponding program, so as to repair, greatly improving the reliability of the screen. At the same time, with the continuous development of LED display technology, super large LED screens emerge in the market. This type of screen is generally installed at a high position and has a long viewing distance, which brings inconvenience to the detection of the display screen. The judgment of each pixel can only be based on human judgment. After using the single point detection function, the maintenance personnel can easily find out the coordinates of the fault point and quickly replace it.

The brightness and chromaticity uniformity of LED display screen has always been a major problem that puzzles the industry. It is generally believed that the brightness unevenness of LED can be corrected at a single point to improve the brightness uniformity, while the chromaticity unevenness cannot be corrected, and can only be improved by subdividing and screening the LED color coordinates.