With its advantages of seamless seamless splicing, high cost performance and superior display effects, the small-pitch LED display has been increasingly used in key applications such as control rooms, command halls, and conference centers.
1, the requirements of image stitching processor
As the pixel spacing of the LED display is getting smaller and smaller, the viewing distance is getting closer. In order to achieve excellent display effect, not only the LED display itself is required to be refined in image processing and assembly process, but also the image splicing processor on the front end of the LED display screen ( The following splicer) also puts forward higher requirements:
(1) Synchronization of the output of the certificate to avoid the phenomenon that the spliced ​​picture is not synchronized;
(2) Optimize the image processing algorithm to keep the scaled image high definition;
(3) Custom output resolution, which should deal with the irregular physical resolution of LED display.
2. Splicing processing technology applied to small-pitch LED display
2.1 splicer and small-pitch LED display
A key application of the splicer is to output multiple DVI signals and splicing multiple display screens in a matrix to make it a logical display area.
For the LED display, we can define the display area driven by one LED controller as a separate LED display. The current LED controller uses DVI/HDMI as the signal input interface to support the maximum input resolution. 1920 × 1200 @ 60Hz, the maximum bandwidth is 165MHz, the maximum physical resolution of the LED display driven is 1920 × 1200.
As the display area of ​​LED small-pitch products is getting larger and larger, dozens of square meters of projects are not uncommon. The physical resolution of LED displays often exceeds 1920×1200, that is, each piece of ultra-large-scale LED display is made up of several The LED controller is composed of several independent display areas. For the application of the splicer, only a number of DVI output interfaces are needed corresponding to the number of LED controllers, and the entire LED screen can be spliced ​​and displayed.
Splicers In the application of small-pitch LED displays, there are several key technologies worthy of attention:
(1) Signal output synchronization
The multi-channel DVI signal output of the splicer must have the synchronization problem of the signal. The unsynchronized signal is output to the LED display screen, and the tearing phenomenon occurs at the splicing place, which is especially noticeable when playing a high-speed moving image. How to ensure the synchronization of the output of the signal becomes the key to measuring the success or failure of a splicing system.
(2) graphics processing algorithm
We know that the point-to-point image display is the best. After the reduced image, if only ordinary graphics processing technology or general-purpose FPGA graphics processing algorithm is used, the edges of the image will be jagged, and even pixels will be missing. The brightness will also drop. High-end image processing chips or FPGA systems that utilize complex graphics processing algorithms will maximize the display of reduced images. Therefore, a good graphics processing algorithm is a key technology for splicers used in small-pitch LED displays.
(3) Non-standard resolution output
The small-pitch LED display is made up of a matrix of display units of the same specification. Each display unit size and physical resolution are fixed, but the entire large screen is not a standard physical resolution. For example, the resolution of the display unit is 128×96, which can only be spelled as 1920×1152, but it cannot spell 1920×1080. In a very large-scale splicing system, the LED display area driven by each LED controller may not be the standard resolution. At this time, the output of the splicer with non-standard resolution is critical, which can help us find the right one quickly. The splicing method, so as to allocate resources reasonably, effectively saves the number of LED controllers and transmission equipment used.
Mouse Pad,Soft Sublimation Printed Mouse Pad,Die Cut Mouse Pad,Direct Custom Logo
Cixi Mingsheng Rubber & Plastic Co.,Ltd. , https://www.popmat.com