Hey, don't tell me, something weird happened last week. It was raining heavily on the opening day of a shopping mall, and the large screen on the stage was playing a 4K promotional video. Water curtains flowed down the screen, but the picture was still so bright that you could clearly see the celebrities' mascara. This makes people want to ask - what kind of place can make such an outdoor full-color LED display that is invulnerable to water and fire?

Three hard indicators to look for manufacturers

Let me tell you the truth first. Nowadays, even in electronic cities, they say they can make outdoor screens. But if it rains for three consecutive days, eight out of ten families will discover their true colors. Here are three key points for you:

1. ​​There have to be real guys in the workshop​ ​: Don’t get hyped by looking at the brochure, just ask if you can see the production line. A serious manufacturer must have at least a 10,000-level dust-free workshop, and the glue injection machine must have a constant temperature system.
2. ​​Laboratory data must be taken in real time​ ​: I dare to show you the 200-hour high-temperature and high-humidity test video, which is much more than the test report.
3. ​​The case must withstand investigation​ ​: A curved screen in a shopping mall in Southeast Asia withstood 12 typhoons in three years. This practical experience is more useful than any certification.

Key points in the pit avoidance guide

Last year, the main stage of a music festival failed. The screen was finely tuned during the day, but at night the whole screen turned white when the lights came on. The director was so anxious that he almost broke down the whole screen. Later it was discovered that the manufacturer did not install an optical filter, a detail that novices would never have thought of. Here are a few key points to avoid pitfalls:

• Don’t just look at the pixel pitch;​ ​Brightness uniformity ≥95%​ ​is the key
• The heat dissipation structure should be equipped with​ ​Intelligent temperature control system​ ​(automatic alarm when temperature difference exceeds 5°C)
• Connectors must be military grade (gold plating thickness is at least 3μm)

Anyone who knows the industry knows that the biggest fear of outdoor screens is not rain but condensation. In the project we did for a seaside resort last year, the screen was stuffed into the body​ ​Humidity replacement device​ ​, can automatically dehumidify in sea fog, a configuration that few companies are willing to install nowadays.

The secret hidden in the parameters

Let’s talk about something that subverts our perception – P3 and P4 screens look similar on sunny days, but on rainy days,​ ​Low brightness and high gray technology​ ​The blessed screen can display 62% more dark details. This is like shooting night scenes, the difference between Huawei and thousand-yuan phones. Nowadays, high-end outdoor screens can do:

• Maintains 1500cd/m² effective brightness under noon sunlight
• 1920Hz refresh rate eliminates shooting streaks
• -Still working normally at 30℃ to +65℃

Here’s a little bit of trivia you may not know: the skeletons of those deformable LED screens used in concerts are​ ​Aviation aluminum magnesium alloy​ ​material. The box made of this material is 40% lighter than ordinary aluminum alloy and 3 times stronger.

University knowledge in material selection

Last year, the naked-eye 3D large screen made for a certain car brand caused a joke. The customer insisted on saving money and used ordinary flame-retardant glue. As a result, the colloid expanded during the rainy season and the module was tilted. Our outdoor screens now come standard​ ​Two-component modified silica gel​ ​, can withstand 2 tons of shear force after curing. Remember a few key points when selecting materials:

1. Lamp beads must be flip-chip ones (formal chips will lose light after two years)
   2 PCB substrate copper thickness is at least 2 ounces (moisture-proof and corrosion-proof)
   3. The mask must be nano-coated (the lotus leaf effect must reach 110° contact angle)

For example, the circular screen at the main venue of an international event can still display normally after being hit by hail.​ ​3mm tempered glass panel​ ​+Honeycomb structure buffer layer. Although this configuration is more expensive, it can be used for ten years without major repairs.

The editor finally says something that comes from my heart: Looking for an outdoor screen manufacturer is like looking for a partner, don’t just listen to sweet talk. Going directly to the workshop to watch production, moving a chair and sitting in the control room to watch them adjust parameters is more practical than anything else. The next time you see the big screen that is so bright on a rainy day, you will understand - this thing starts from the production line, and every screw is calculated.

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