Hey, where should I start if I want to learn LED display technology? A while ago, a friend who runs an advertising company complained to me, saying that the display screen I bought for 30,000 yuan broke down within half a year, and the maintenance man asked for 8,000 yuan. This incident suddenly made me realize that understanding LED technology can really save a lot of wasted money! Today I will take you through how to learn this craft.

​​1. Have a thorough understanding of basic knowledge​​
Don't be in a hurry to disassemble and assemble it. You must first understand the "internal organs" of the display screen. Just like you need to know the CPU and graphics card to assemble a computer, you need to know these things to learn LED screens:

• ​​Luminous principle​ ​: In fact, each pixel is made up of three red, green and blue lamp beads doing tricks, and millions of colors can be produced through different brightness combinations.
• ​​Classification doorway​ ​: The indoor screen is as delicate as a greenhouse flower, with a maximum brightness of 1200cd/m²； The outdoor screen is made of solid materials and has a brightness of 7500cd/m² that can be seen clearly even at noon.
• ​​Key parameters​ ​: There will be no water ripples if the refresh rate is above 1920Hz. The smaller the dot spacing, the more delicate the picture will be. P3 and P10 look completely different.

I remember a student made a joke and installed the indoor screen outdoors, but it was immediately scrapped during the rainy season. This is like changing the water to cold water for tropical fish. Can it avoid overturning?

​​2. Control technology is the highlight​​
Nowadays, the display screen is no longer a light box that lights up when plugged in. You need to be able to play with the control system:

• ​​signal transmission​ ​: Serial port, network port, and wireless each have applicable scenarios. Only large screens in shopping malls can handle 4K video using optical fiber transmission.
• ​​Programming basics​ ​: C language is a basic skill, and Python is enough for simple control. There is a young man born in 2000 who wrote an automatic brightness adjustment program in Python and saved 20% of electricity bills in a year.
• ​​Communication protocol​ ​: DMX512 and SPI are like the "dialects" of the display screen. You must be able to understand and speak them.

A few days ago, I heard that a large screen crashed at an exhibition, and the technician changed the code on the spot and fixed it in half an hour. This skill cannot be mastered in two years of practice.

​​3. Installation and maintenance must be practical​​
In this industry, the most taboo thing is to talk about war on paper. You have to do it with real swords and guns:

1. ​​Construction process​ ​: From measuring and setting out to steel structure welding, the module may not be installed even if it is just 1 mm off.
2. ​​Troubleshooting Tips​ ​: If the screen is black, touch the temperature first. Check the color block to check the power supply voltage. If the dead light is blown with a heat gun for three seconds, it will be revived.
3. ​​Daily maintenance​ ​: Monthly dust removal, quarterly color correction, and annual comprehensive inspection are the same as car maintenance.

A master once told me that he and his apprentices must take the "blind box disassembly" test - it takes five minutes to disassemble and assemble the module while blindfolded to pass the test. This unique skill saved the concert from a crisis, and the scene was still repairing the screen even though the lights were dark.

​​4. There are ways to choose and match models​​
Being able to pretend is not a skill, but being able to help customers choose the right screen is a real expert:

• ​​commercial​ ​: The large screen at the intersection needs to have a brightness of 5500cd/m² or above, and it must have an intelligent light sensor.
• ​​stage floor tiles​ ​: The load-bearing capacity must reach 500kg/m², and the surface must be treated with anti-slip treatment.
• ​​Transparent display window​ ​: 86% permeability is the bottom line, otherwise it will affect the lighting of the store.

The most amazing case I have ever seen is a wavy LED wall installed in the atrium of a shopping mall, and the angle of each module must be manually adjusted. I really can't do this kind of work without some space for imagination.

​​personal opinion​​
Learning LED technology is like practicing martial arts. You have to practice basic skills first, and then learn the moves and routines. Don't believe those 7-day crash courses. The most reliable masters I've seen were all picked from workshops. It is recommended that novices first practice with second-hand screens, starting from changing lamp beads and flashing programs, and wait until they have figured out thirty or fifty modules before embarking on a major project. Remember, this technology updates faster than mobile phone generations. The COB packaging that was popular last year has started to use Micro LED this year. Keep learning to avoid being eliminated.

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