Have you seen those super shocking giant screens in the mall? The dynamic background of the newlyweds when they appear at the wedding, the naked 3D advertisements in the shopping mall atrium, and the visual effects that ignite the audience at the concert... These pictures that make people unable to move their eyes are all supported by the large LED screen. But when I really want to buy it, I searched online and all suppliers, with prices ranging from thousands to millions, which made people's scalp tingling—​Where should I buy this thing? How to avoid being cheated?​​

First pour cold water: Buying a large LED screen is not a TV, you can do it by just finding a home appliance city. Last month, a boss who opened a bar bought a so-called "engineering" screen on Taobao with cheap pictures. After installing it, I found that the brightness could not be suppressed even the spotlight of the wine cabinet. I put the MV on the screen full of mosaics. Only then did I understand,​Choose the wrong purchasing channel and mess up your business in minutes​​。

​​There are only three reliable channels​

1. ​Direct sales from source manufacturers​: Especially for automation factories with monthly production capacity of more than 10,000 square meters, this type of enterprise often holds full set of ISO9001, CE and other certifications, and controls them from chips to cabinets.
2. ​Industry exhibition site​: Professional exhibitions like Shenzhen Optical Expo can compare the display effects of different models with your own eyes. Remember to bring a USB flash drive test video
3. ​​Government procurement platform​: List of suppliers designated by municipal projects. Although the process is troublesome, the quality is guaranteed

But you may ask: Can those stores on the Internet claiming to be "direct sales by manufacturers" trust? Here is a trick for you——Require video factory inspection​. A truly powerful company dares to let you view the automated production line through the camera, a fully enclosed dust-free workshop, and an export packaging box full of shelves. Last year, the owner of a gym saw through an OEM workshop, and the other party was afraid to show the real scene of the warehouse.

​​Technical parameters must be fought to the death​
Don’t be fooled by the professional terms of salesmen’s “P2.5 and P3”, and focus on these hard indicators:

• ​​Refresh rate ≥1920Hz​​: Watch the high-speed screen without striking (simple test method: use slow motion of the mobile phone to shoot the screen, and if the black bar appears, it means that the standard is not met)
• ​​Intelligent brightness adjustment​: The indoor screen 800-1200cd/m² can take into account both comfort and clarity, and the outdoor screen is not visible during the day when it is below 4000cd/m²
• ​​Protection level​: You must choose IP65 for rain and dustproof when installing on the stadium, just use ordinary IP43 in the restaurant.

Here is a real case: a shopping mall atrium installed with a transparent screen with a 86% transmissiveness. As a result, because it was not protected from ultraviolet rays, the screen turned yellow like an old photo after half a year. So​Special scenarios must be explained in advance​, for example, beach projects should prevent salt spray corrosion, and plateau areas should strengthen heat dissipation design.

​​Installation and maintenance are the highlight​
Many people only find that the installation fee is more expensive than the equipment after buying the screen! At this time, it depends on whether the manufacturer has it​​Full process service​​：

1. Go to the door to measure the site in advance and produce 3D renderings
2. Construction team with steel structure qualification certificate
3. 24-hour online technical response
   Last year, the organizer of a music festival suffered a great loss. He found that there were fewer adapters in the screen in the middle of the night. The supplier's customer service actually said, "I will go to work at 9 o'clock tomorrow", which directly led to delays in the performance.

Speaking of price, there must be a misunderstanding here:​Buy an LED screen, the more expensive it is.​. For example, if you use a rental screen in the indoor conference hall, you can choose a magnesium-aluminum alloy box that can be quickly disassembled and installed to save 60% of the installation time; while for a long-term fixed outdoor advertising screen, you need to use heavy-duty die-cast aluminum box to carry the typhoon. There was a customer who had to use lightweight boxes along the southern coast, but the typhoon season was blown into a "flying screen" directly.

Finally, I would like to give a reminder to the soul: Don’t trust those merchants who promise to "three years of exchange"! The lifespan of LED screens is only 50,000-80,000 hours, and the light decay will definitely exceed 30% after three years of normal use. A truly reliable manufacturer will tell you directlyWhat maintenance is needed every year​, for example, air guns should be used to clean the ash every quarter, and the waterproofness of the line should be checked before the rainy season.

So back to the initial question - where is the reliable place to buy LED large screens? My suggestion is:​Select directly to find the source manufacturer with export qualifications​​, especially companies whose products can be sold to the Japanese and Korean markets. The quality control standards that these factories have been abused by overseas customers are definitely ten times more reliable than some domestic "relationship household" suppliers. Next time I see the salesperson yelling that his screen is so great, let him first pat the customs declaration form on your face!

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