Have you encountered this situation too? Looking at the cool LED screen in the mall, a thought suddenly popped up:​ ​With so many light bulbs on, where exactly is their power hidden? ​ ​ What's even more crazy is that some screens appear partially black blocks as they are used, and most likely, there is something wrong with the power supply. Today, let’s take a look at the tricks in this industry.

​​▍Can the power supply be hidden behind the screen? ​ ​
Many people think that the power supply should be installed closely to the screen, but in fact, this idea depends on the scene. For example:

• ​​Indoor fixed screen​ ​: It can indeed be made into a hidden power bank, but it must be reserved​ ​Heat dissipation space above 15cm​​
• ​​Stage rental screen​ ​: It is now popular to integrate the power module on the side of the box and connect it with the quick disassembly interface.
• ​​Outdoor advertising screen​ ​: The waterproof distribution cabinet must be set up separately, the recent cases show​ ​Power cabinet life exceeds 3 meters away from the screen is extended by 40%​​

Here is an abnormal design:​ ​The higher the LED screen, the further the power system is from the screen.​ ​. Because high-power devices will cause electromagnetic interference, just like when you get close to the audio when you make a phone call, poor power distance control will cause ripple on the screen.

​​▍How to protect the outdoor screen from rain and dust? ​ ​
At a music festival last year, heavy rain caused 20% of the LED screen to blacken, and the problem lies in power protection. Current industry standards requirements:

1. ​​Protection level must reach IP65​ ​(Can resist high-pressure water gun flushing)
2. ​​The wiring port must be installed facing downwards​ ​, prevent rainwater from pouring back
3. ​​The heat dissipation holes must be cleaned every three months​ ​, dust accumulation will cause internal temperature to soar

There is a very clever design​ ​Dual power supply redundant system​ ​——Simply put, it is to connect two sets of power supply lines to the screen. Even if the main power supply fails, the backup power supply can automatically switch within 0.3 seconds, and the audience will not notice any abnormality.

​​▍Will the power cord of the stage floor tiles trip up? ​ ​
This problem is the most troublesome at the concert. The solution now is in three steps:

• ​​Pre-embedded wiring​ ​: Build power supply pipelines when building the stage
• ​​Wireless power supply test​ ​: Certain high-end projects begin testing magnetic resonance wireless transmission technology
• ​​Safe voltage control​ ​: Reduce the working voltage below 36V, even if the leakage is not harmful

There is a data that may surprise you:​ ​The power cord life of professional stage screens is only 1/3 of that of ordinary products​ ​. Because of frequent bending and pulling, manufacturers will make this type of wire into a spiral structure, which can stretch and prevent breakage like old phone lines.

​​▍Does the power position affect the screen effect? ​ ​
Here we will talk about two key technical parameters:

1. ​​Voltage stability​ ​: Fluctuations exceeding ±5% will lead to uneven brightness
2. ​​Synchronous transmission delay​ ​: Every 10 meters increase in power distance, the signal delay increases by 0.02 milliseconds

Recently, there is an innovative design​ ​Linkage between power management system and display control system​ ​. For example, when the screen displays a dark screen, the power supply will automatically lower the output power, which can save power and reduce component losses.

Editor's opinion: After reading these, you may find that the power setting is not as simple as finding a corner to stuff it in. From the relationship between heat dissipation and signal transmission, every detail tests the design skills. Next time you see a large LED screen that works smoothly, you might as well think about the invisible power cords behind it - they are the invisible heroes who maintain light and shadow magic.

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