Are you also worried - why do some large stage screens turn gray as soon as it's dark, and the light and shadow details on the actors' faces are all blurred? Or if the equipment suddenly crashes and the entire performance is interrupted? Let’s talk this time​ ​How to choose a stage-specific LED screen?​ ​, novices can avoid at least 80% of pitfalls after reading it.

▍​​Brightness is not better when it is higher​​
Many people's first reaction is to "choose the brightest one", which is a surprise. Stage lighting changes complexly, and the brightness of the large screen must be intelligently adjusted according to the scene. For example, when the spotlight illuminates the protagonist, the screen must automatically drop to about 800cd/m² so as not to steal the scene. ； When it comes to the full dark scene, it must be able to instantly reach 1200cd/m² to highlight the visual impact. I have seen some bar stage screens with the fixed brightness adjusted to the highest level. The singer is directly in front of the station and is blinded by the bright light - this is typical.​ ​Brightness adjustment technology is not up to standard​​。

▍​​Refresh rate is the hidden trick​​
Water ripples appear when the camera pans across the screen? This is the problem with insufficient refresh rate. Professional stage screens must achieve ≥1920Hz to be able to withstand the high-speed capture of 4K cameras. There was an accident at a music festival last year - the large screen in the live broadcast was full of scanning lines, and the director was forced to wait for half an hour. After disassembling the phone for inspection, I found that it used a second-hand refurbished driver IC, and the actual refresh rate was not even 800Hz.

▍​​These parameters must be verified in person​​
• ​​Touch the cooling vent 20 minutes after turning on the computer​ ​: Direct pass if the temperature exceeds 45℃ (a screen with poor heat dissipation cannot last the entire performance)
• ​​Take screen shots with your phone in slow motion mode​ ​: The picture is considered qualified if there is no black smear.
• ​​Request a trial of dark field video​ ​: The grayscale transition must have at least 16bit layering (the pore texture of the face must be clear)

▍​​Special situations require special treatment​​

▍​​After-sales guarantee is more important than price​​
One theater suffered a heavy loss when it purchased a so-called "cost-effective" screen, only to have a large area of ​​dead lights appear on the day of the premiere. I contacted the manufacturer but was told that it was "out of warranty for three days." In the end, I had to temporarily rent the screen to save the situation. The rent was three times more expensive than the original price. Regular manufacturers will be equipped with​ ​24-hour emergency response team​ ​, some can also diagnose faults remotely and bring spare modules to the door. Remember to pay attention to these two items when signing a contract:

1. ​​The whole screen warranty starts at least 2 years​ ​(Lamp beads, power supply, control system all included)
2. ​​Provide on-site stress testing​ ​(Simulating power outages, signal interference and other emergencies)

▍​​You can only see the truth where you can't see it​​
Nowadays, the industry is deeply involved. Some merchants write beautiful parameters on the surface, but actually renovate second-hand lamp beads. I’ll teach you a tough trick – ask to see it​ ​Production batch traceability code​ ​, regular manufacturers can check the source of raw materials for each module. Then it depends on whether the manufacturer dares to accept it.​ ​Special-shaped screen customization​ ​, which can make curved and wavy structures, at least with excellent craftsmanship.

Editor's opinion: Every penny you save on stage screens may turn into explosives for performance accidents. Next time you purchase, be sure to bring someone knowledgeable with you to verify the parameters with the manufacturer's test report, and then take a look at the production workshop - whether there is an aging test area on the assembly line, and whether the quality inspector is really testing the screen. These details cannot deceive people.

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