With the birth of the micro-pitch Indoor Flexible LED Mesh display, the micro-pitch LED display has been more and more used in Command center hall, control room, conference center and other key places. With the continuous shrinking of the pixel pitch of the micro-pitch LED display, people’s viewing distance is further shortened. In order to achieve a better display effect, not only the fine-pitch LED display itself is required to keep improving in image processing and processing technology, but also to The image splicing processor of the front-end signal of the micro-pitch LED display also puts forward higher requirements.
As shown in the figure above, a complete micro-pitch LED display system includes a back-end micro-pitch LED display processing system and a front-end image splicing processing system. Through a set of large-screen control management software, each hardware device in the system can be effectively controlled and processed. , and finally realize the perfect display of each signal on the screen according to people’s requirements. The advantage of the micro-pitch LED large-screen display system lies in the high degree of system integration. The whole system is centrally controlled and managed by a set of control management software. In addition to image processing system, display unit equipment management, and control of various signal display methods, it also It can control RGB matrix, video matrix and other related peripheral equipment, so that multiple systems can achieve high integration and centralized control. The key components of the large-screen system – micro-pitch LED display unit, pure hardware multi-screen processor and large-screen control and management software need to use the same brand, and all adopt targeted compatible connection design to ensure system compatibility and provide reliable security. . Display unit, image controller and control software are the core parts of the whole large-screen system. If products from different manufacturers are used for integration, technical compatibility problems may occur, which will affect the realization of many important functions and reduce the reliability and efficiency of the system. ; On the other hand, because multiple manufacturers are involved, it is likely that after-sales maintenance will affect fault diagnosis and timely supply of spare parts. At the same time, the system upgrade may not be consistent, reducing the scalability of the system. It can be seen that to ensure that the micro-pitch LED display system can display perfectly and operate continuously and reliably, only high-quality LED display units are far from enough, and an image processor with good compatibility and excellent performance is also indispensable. One ring, let me make an interpretation of the image splicer technology of the micro-pitch LED display:
First of all, we need to recognize the difference between the micro-pitch LED display and other large-screen display technologies (such as DLP, LCD). Based on these differences, we can determine which functions must be modified or added to the traditionally applied image splicer to be suitable for our application. Micro pitch led display.
Compared with the traditional large-screen display technology, the micro-pitch LED display has the advantages of longer service life, better display effect, true seamless splicing, energy saving, environmental protection and low noise, but the biggest difference is actually reflected in its cabinet In terms of composition, traditional DLP or LCD splicing display units all have standard resolution input support, while micro-pitch LED displays mostly have non-standard resolutions; another difference is that most of the traditional large-screen display units have size and resolution Relatively large, while the micro-pitch LED display unit considers the smoothness of arc splicing and the limitation of dot spacing, the size of the unit box is small, and the resolution is small. The splicing composition must cooperate with the sending card and receiving card to achieve the final display. Most of the connection between the sending card and the front-end image processor is not corresponding to the standard resolution; a key application of the splicer is that it can output multiple DVI signals, and splicing and displaying multiple display screens arranged in a matrix, making it a Logically complete display area.
For the micro-pitch LED display, we can regard the display area driven by an LED controller (sending card) as an independent LED display. Most current LED controllers use DVI as the signal input interface, which supports The maximum input resolution is 1920&TImes;1200, so the maximum physical resolution of the driven LED display is 1920&TImes;1200. As the display area of micro-pitch LED display products becomes larger and larger, there are more and more projects of tens of square meters , The physical resolution of the LED display often exceeds the resolution of 1920&TImes; 1200, so it is basically composed of multiple independent display areas driven by multiple LED controllers. For the splicer, it needs to correspond to the number of LED controllers, provide a corresponding number of DVI output interfaces, and splice and display the entire LED screen. In addition to the traditional technical problems of the upper screen of the splicer, the front-end splicer of the micro-pitch LED display must solve three problems:
1. The output resolution can be customized to deal with the irregular physical resolution of the LED display
We all know that the micro-pitch LED display screen is spliced by display unit boxes one by one in matrix form, and the size and physical resolution of each display unit are fixed, but the entire large screen that is combined and spliced together is often not one. Standard physical resolution, for example: the physical resolution of the display unit is 128&TImes;144, which can only be spliced into 1920×1152, and the standard resolution of 1920×1080 cannot be spliced without it. Usually in a large-scale splicing system, most of the LED display area driven by each LED controller is not a standard resolution. At this time, it is particularly important for the front-end splicer to have a non-standard resolution output. Unique splicing method, reasonable allocation of resources, effectively saving the number of LED controllers and transmission equipment used, increasing the stability and reliability of the system, while ensuring the best display effect.
2. It is necessary to ensure the synchronization of the output, avoid the out-of-sync phenomenon of the splicing screen, and ensure that there is no tearing phenomenon in the display
The multi-channel DVI output signal of the splicer must have the synchronization problem of the signal. If the asynchronous DVI output signal is output to the LED display, there will inevitably be a picture tearing phenomenon at the picture splicing place, especially when playing fast-moving images. obvious. How to ensure the output synchronization of the signal becomes the key to measure the success or failure of the splicer system.
3. More high-quality image processing algorithms must be used to make the zoomed images easy to transmit and maintain high definition
As we all know, the point-to-point image display effect is the best. If the reduced image only uses ordinary image processing technology or general image processing algorithm, the brightness of the image will decrease, and the edge of the image will appear jagged or even missing pixels. . In the face of the demanding display effect of the micro-pitch LED display, it is obvious that high-end image processing chips and complex optimized image processing algorithms must be used to ensure that the processed image maintains the best display effect to the greatest extent. Therefore, it is better The advanced image processing algorithm is one of the keys for the image splicer to be applied to the micro-pitch LED display.