Several key technologies of small-pitch LED screen video processor

With the increasing display area of ​​LED small-pitch products, projects of dozens of square meters are common. The physical resolution of LED displays often exceeds 1920 × 1200, that is, each ultra-large-scale LED display consists of several It is composed of several independent display areas driven by each LED controller. For the application of the splicer, it only needs to provide several DVI output interfaces corresponding to the number of LED controllers, and the entire LED screen can be spliced ​​and displayed. In the application of small pitch LED display, there are several key technologies worth paying attention to.

1.Signal output synchronization

The multi-channel DVI signal output of the video processor inevitably has the problem of signal synchronization. Unsynchronized signals are output to the LED display, and the screen tearing phenomenon will appear at the splicing place, especially when playing high-speed moving images. How to ensure the signal output synchronization becomes the key to measure the success or failure of a splicing system.

2.Graph processing algorithms

We know that the point-to-point image display effect is better. If the image after reduction processing is only using ordinary graphics processing technology or general FPGA graphics processing algorithm, the edges of the image will appear jagged, and even the pixels will be missing. The brightness will also decrease. High-end image processing chips or FPGA systems that use complex graphics processing algorithms will try to ensure the reduced image display effect. Therefore, a good graphics processing algorithm is a key technology for a splicer applied to small-pitch LED displays.

3.Non-standard resolution output

The small-pitch LED display is formed by splicing a matrix of display units of the same specifications. The size and physical resolution of each display unit are fixed, but the entire large screen stitched together is often not a standard physical resolution. For example, the resolution of the display unit is 128 × 96, which can only be 1920 × 1152, but cannot be 1920 × 1080. In a very large-scale splicing system, the LED display area driven by each LED controller may not be of a standard resolution. At this time, it is critical that the splicer has an output with a non-standard resolution. It can help us quickly find the right one. The splicing method can reasonably allocate resources and effectively save the use of LED controllers and transmission equipment.