Splicing processing technology applied to small-pitch LED display

As the display area of LED small-pitch products becomes larger and larger, projects of tens of square meters are not uncommon, and the physical resolution of LED displays often exceeds 1920×1200, that is, each ultra-large-scale LED display is composed of several independent display areas driven by several LED controllers. For the application of the splicer, it only needs to provide several DVI output interfaces corresponding to the number of LED controllers, and splicing and displaying the entire LED screen.

01 Synchronization of Signal Output

The multi-channel DVI signal output of the splicer must have the synchronization problem of the signal. When the asynchronous signal is output to the LED display, there will be picture tearing at the splicing point, especially when playing high-speed moving images. How to ensure the output synchronization of signals becomes the key to measure the success or failure of a splicing system.

02 Graphics Processing Algorithm

We know that the point-to-point image display effect is the best. If only ordinary graphics processing technology or general-purpose FPGA graphics processing algorithm is used for the reduced image, the edges of the image will appear jagged, and even pixels will be missing. The brightness will also decrease. The high-end image processing chip or the FPGA system using complex graphics processing algorithms will ensure the display effect of the reduced image to the greatest extent. Therefore, a good graphics processing algorithm is a key technology for a splicer applied to small-pitch LED displays.

03 Output at Non-standard Resolutions

The small-pitch LED display is composed of a matrix of display units of the same specification. The size and physical resolution of each display unit are fixed, but the entire large screen that is spliced is often not a standard physical resolution. For example, the resolution of the display unit is 128×96, which can only be spelled into 1920×1152, but not 1920×1080. In an ultra-large-scale splicing system, the LED display area driven by each LED controller may not have a standard resolution. At this time, the output of the splicer with a non-standard resolution is critical, which can help us quickly find a suitable Splicing mode, so as to allocate resources reasonably and effectively save the number of LED controllers and transmission equipment used.