Have you ever encountered such embarrassment? On the day of the opening of the mall, the large LED screen that was installed at a high price suddenly became a PPT, and the advertising video became a "ghost animal" scene as it was broadcast. Today we will break it apart and break it up.​ ​Where is the seven-inch screen stuttering in the LED screen?​​？

1. The hard-hit buried in hardware configuration

​**​1. The pixel spacing is wrong, the picture comes with mosaic​**​ Last month, a supermarket chain held a promotion. When the installed P10 outdoor screen played special price information, customers couldn't see the price clearly between twenty meters - this is a typical insufficient pixel density. Outdoor scenes must use at least P6 spacing. For highway billboards, which require identification of 100 meters away, P4 is the standard [2,8](@ref).

​​2. The cooling system cuts corners and reduces frequency directly from high temperatures​​
At a music festival last year, the stage floor tiles LED screen started to perform the third song. Later, it was found that the thickness of the heat sink was 0.5mm less. Nowadays, reliable outdoor screens are all refrigerated with liquid cooling. Like the dual circulation water cooling system built by some manufacturers in Southeast Asia projects, the high temperature of 40℃ is still as stable as an old dog.

​​3. The power supply modules are used to make up the number, and voltage fluctuations are life-threatening​​
Don’t believe the nonsense of “one power supply with eight modules”! The most outrageous case we have ever seen is that a shopping mall screen uses a inferior power supply. When the voltage fluctuates at night, the entire screen flashes like a marquee. Nowadays, advanced solutions are all smart distribution cabinets + redundant backups, and voltage fluctuations are not jittered within ±15%.

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2. The pit hidden in the software system

​**​1. The control system is incompatible, the format conversion is stuck to the explosion​**​ A customer complained two days ago that the 4K promotional video was broadcast smoothly on the computer, and it stuck into a comic strip when it was on the screen. Later, it was discovered that the video decoder was incompatible with the H.265 format, so it was replaced with a professional player that supports 8K@60Hz to solve the problem immediately. Nowadays, high-end control systems have their own format automatic adaptation function, and even the original Blu-ray disk can be directly matched [2,5](@ref).

​​2. If the signal transmission fails, the packet will be lost a hundred meters away.​​
Anyone who has held concerts knows that wireless transmission is a time bomb. The main screen and the secondary screen of a music festival were transmitted using 5G, and the mobile phone signal of the audience on the scene burst the channel. Now all professional venues have been switched to optical fiber + backup microwaves, and the transmission delay of 200 meters does not exceed 3ms.

​​3. Content management is too mentally retarded, multi-screen linkage changes jammed code​​
There is a shopping mall that conducts cross-layer screen promotions, but the third floor broadcasts special offers, and the fifth floor displays job advertisements. This kind of accident is probably because the content management system does not have equipment grouping. Now the intelligent central control system can manage 200+ screens at the same time, and can also automatically switch content based on customer flow.

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3. Devil details of installation and maintenance

​**​1. The steel structure is calculated incorrectly and the screen body is deformed.​**​ The most outrageous installation accident that I have ever seen was that the fenced screen of a stadium was welded three supporting points because the steel frame was less than welded, and the screen was bent into a crescent shape after half a year. Nowadays, professional installation teams use BIM modeling to rehearse the stress, and even the wind pressure at the typhoon level is clearly calculated [6,7](@ref).

​​2. The waterproofing of the connector is not done well, and a collective strike will occur on rainy days​​
Coastal projects are most afraid of this! The price screen at the entrance of a seafood market will bloom whenever it rains. When it is opened, it will find that the DVI interface is full of moss. Now the high-end waterproof solution is connected to the plug-in with glue and sealed, and IP68 protection can be used in water.

​​3. Daily maintenance is done in a formal way, dust accumulates and burns lamp beads​​
Don't think that just rubbing the surface is done! The background screen of Youjia Cinema has not cleared the internal dust for three years and the heat dissipation hole is blocked, resulting in batches of modules burning. Professional maintenance requires disassembly of the module and cleaning it with an electrostatic brush, and a thermal imager must be used to detect temperature abnormalities.

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To be honest, choosing an LED screen is like finding a partner——​ ​Hardware is the body, software is the brain, and service is the life​ ​. Those screens that look at the parameters that are so scattered that they actually become dogs are mostly not matched by the three. Next time I meet a mysterious supplier, I asked him directly: "Can your system withstand 30,000 people live broadcasts on the spot at the same time? "Make sure you can try out real skills.

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