Hey, when you watch a concert, have you ever noticed why the giant screen behind the singer always keeps up with the rhythm? Performances on rainy days don’t even suffer from screen blur? This is the power of LED synchronization screen! However, if a novice wants to buy this kind of professional equipment, nine times out of ten he will be deceived - some people spend a lot of money to buy an asynchronous screen, and some are tricked into buying it as a monitoring screen. Today we will break it down and talk about how to avoid these pitfalls.

1. Synchronous screens and ordinary screens are not relatives at all.

Last year, a bar owner complained to me that the "high-end screen" he bought always stopped playing music videos for half a beat, and the customers thought it was a network problem. ​ ​In fact, the key depends on three parameters:​​：

1. ​​Refresh rate must be ≥1920Hz​ ​: This number is like the number of heart beats on the screen. The higher the number, the smoother the fast screen playback. The test method is very simple. Use your mobile phone to take a slow-motion shot of the screen. If a black bar appears, it means the standard is not met.
2. ​​Grayscale starts at 16bit​ ​: A good screen can distinguish 65536 shades of gray in a dark field image, while a bad screen will be completely black. Take a look at the footage of the Night King's battle in "Game of Thrones" and you'll find out.
3. ​​The transmission distance should be wild enough​ ​: The serious synchronization screen uses optical fiber transmission, and there is no frame loss at a distance of 500 meters. Some knock-off products have a flickering screen when the distance exceeds 50 meters. It’s really scary.

2. Five must-test questions for on-site inspection

Last month, I accompanied a friend to inspect the product, and the supplier came to brag about the 4K resolution. ​ ​All those who really know the business have experienced this​​：

• ​​Put Excel table​ ​: Display horizontal and vertical lines in full screen. Stand 5 meters away to see if there are any broken lines or jagged lines.
• ​​Play high-speed motion video​ ​: Select a football match clip, and the ball with a smear of more than 1 cm will be eliminated immediately.
• ​​Turn off the lights to see the uniformity​ ​: Under a pure white screen, if the brightness difference between the four corners and the center exceeds 10%, it is considered a defective product.
• ​​water splash test​ ​: Splash water on the screen when the phone is on. If a color block appears, it means the protection is not adequate.
• ​​Touch temperature​ ​: After 2 hours of continuous operation, if the screen temperature exceeds 45℃, pass directly

3. Hidden knowledge points in installation and maintenance

Do you think that’s it after buying a screen? The pattern in Tucson is broken! ​ ​Only after stepping on these pits do you know how painful it is​​：

1. The synchronization screen must be equipped with a special graphics card, which cannot be used with an ordinary computer. In one shopping mall, after buying a screen, I found out that it would cost another 30,000 yuan to install a host.
2. Screens exceeding 100 square meters must have cooling ducts, otherwise the color will fade within half a year.
3. Splicing and debugging are charged by the hour, and the lump sum price must be negotiated in advance. The worst case I have ever seen, the debugging fee is more expensive than the screen
4. Be sure to confirm the software update service, otherwise the system will be incompatible and become a brick after three years.

4. The life and death line of after-sales service

I know someone who does exhibitions. After two years of use, color patches appeared on the screen. The manufacturer said that man-made damage would have to be paid for at his own expense. ​ ​The contract must state these​​：

• Three-year on-site warranty, response time no more than 4 hours
• Proof of spare screen inventory to ensure replacement within 48 hours
• Free lifetime software upgrades, including special format decoders
• Free dust removal and maintenance twice a year (many faults are actually caused by dust accumulation)

Once while chatting with an engineer, he told me a trick for choosing a synchronized screen: let the supplier play the space footage of "The Wandering Earth" live. If the stars are trailing or the edges of the ship are jagged, there's definitely something wrong with the screen. In fact, buying a sync screen is like looking for a partner. You can't just look at looks, the key is to look at "inner beauty."

Nowadays, some screens on the market are called "quasi-synchronous", but they are actually high-end asynchronous screens. This kind of static screen broadcast is okay, but the secret is revealed when it moves. Remember, the receiving card of a true sync screen must have an optical fiber interface, and the control system must be of a well-known brand. Don’t believe those who use mobile APPs as controllers. That thing can’t even control a wedding video!

After all, choosing a synchronized screen is choosing a service. A good supplier can manage everything from solution design to system upgrades five years later, while a bad supplier will disappear as soon as the screens are sold. Next time you go to inquire about a quote, just ask: "If the screen goes black during our performance at three in the morning, how quickly can you get someone here?" "——This question is the best way to test your true abilities.

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