Talking about the splicing processing technology of small-pitch LED display

With the birth of a small pitch LED display, LED display with a small pitch with a true seamless, high price, superior color reproduction, almost perfect display, etc., has been more and more applications in Command center hall, control room, conference center and other key occasions. As the pixel pitch of the small-pitch LED display is continuously reduced, the viewing distance of people is further narrowed. In order to achieve a more excellent display effect, not only the small-pitch LED display itself is required to be refined in image processing and processing technology, Image stitching processors for small-pitch LED display front-end signals also place higher demands.

A complete small-pitch LED display system consists of a small-pitch LED display processing system at the back end and an image stitching processing system at the front end. Through a large-screen control management software, various hardware devices in the system are effectively controlled and processed, and finally each signal is realized. Perfect display. The advantage of the small-pitch LED large-screen display system is 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 device management, and control of various signal display modes, Control related peripheral devices such as RGB matrix and video matrix to achieve high integration and centralized control of multiple systems. The key components of the large-screen system - small-pitch LED display unit, pure hardware multi-screen processor and large-screen control management software need to adopt the same brand, and all adopt the targeted compatible design to ensure reliable system security while ensuring system compatibility. . The display unit, image controller and control software are the core parts of the whole large-screen system. If the products are integrated by different manufacturers, it is likely to cause technical compatibility problems, affect the realization of many important functions, and reduce the reliability and efficiency of the system. On the other hand, due to the involvement of multiple vendors, it is very likely that after-sales maintenance will affect the fault diagnosis and the timely supply of spare parts, and the system upgrade may not be consistent, reducing the scalability of the system. It can be seen that the small-pitch LED display system can be perfectly displayed and continuously operated reliably. Only a good quality LED display unit is not enough. An image processor with good compatibility and excellent performance is also indispensable. One ring, below I will make an interpretation of the image splicer technology of the small pitch LED display:

First of all, we need to recognize the difference between small-pitch LED display and other large-screen display technologies (such as DLP, LCD). Based on these differences, we can determine which features of traditional application image splicers must be modified or added to be applicable to us. Small pitch LED display.

Compared with the traditional large-screen display technology, the small-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 have standard resolution input support, while small-pitch LED displays are mostly non-standard resolution; another difference is the size and resolution of traditional large-screen display units. Larger, and the small-pitch LED display unit takes into account the smoothness of the arc-shaped splicing and the limitation of the dot spacing. The unit cabinet has a small size and a small resolution, and the splicing composition is matched with the transmitting card and the receiving card to achieve the final display. The connection between the sending card and the front-end image processor is not the standard resolution; a key application of the splicer is to output multiple DVI signals, and splicing and displaying multiple display screens in a matrix arrangement, making it a A logically complete display area. For the small-pitch LED display, we can regard the display area driven by one LED controller (send card) as a separate LED display. The current LED controller uses DVI as the input interface of the signal. The maximum input resolution is 1920×1200, then the maximum physical resolution of the LED display is 1920×1200. With the display area of ​​small-pitch LED display products increasing, dozens of square meters of projects are getting more and more. The physical resolution of LED displays often exceeds 1920 x 1200 resolution, so they are basically composed of multiple independent display areas driven by multiple LED controllers. For the splicer, it is necessary to correspond to the number of LED controllers, provide a corresponding number of DVI output interfaces, and splicing and displaying the entire LED screen. In addition to the traditional technical problems existing on the screen of the splicer, the front splicer of the small-pitch LED display must solve three problems:

First, the output resolution can be customized to cope with the irregular physical resolution of the LED display.

We all know that the small-pitch LED display is made up of a block of display unit boxes in a matrix form, and each display unit size and physical resolution are fixed, but the entire large screen that is combined and combined is often not a The standard physical resolution, for example, the physical resolution of the display unit is 128 × 144, can only be spliced ​​into 1920 × 1152, can not spell out the standard resolution of 1920 × 1080. Usually in large-scale splicing systems, the LED display area driven by each LED controller is mostly not the standard resolution. At this time, the front splicer has a non-standard resolution output, which is especially important, which can help us find the right one quickly. The splicing method, rational 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.

Second, the synchronization of the output must be ensured, and the unsynchronized phenomenon of the spliced ​​picture is avoided, and the display is free from tearing.

The multi-channel DVI output signal of the splicer must have the synchronization problem of the signal. The unsynchronized DVI output signal is output to the LED display screen, and the picture tearing will occur in the picture splicing place, especially when playing fast moving images. obvious. How to ensure the output synchronization of the signal becomes the key to measuring the success or failure of the splicer system.

Third, a higher quality image processing algorithm must be used to make the scaled image facilitate transmission and maintain high definition.

It is well known that the point-to-point image display effect is the best. If the reduced image is only normal image processing technology or general image processing algorithm, the brightness of the image will decrease, and the edges of the image will appear jagged or even missing pixels. . In the face of the demanding requirements of the small-pitch LED display, it is obvious that high-end image processing chips and sophisticated optimized image processing algorithms must be used to ensure the optimal display of the processed images to the utmost extent. Therefore, The image processing algorithm is one of the keys to the image splicer applied to small-pitch LED displays.

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