Every day when you pass by the mall, you see those cool advertising large screens. Have you ever been curious about this huge screen, you will never use a remote control like a TV at home? Hey, it's not true! Two days ago, I saw an engineer holding a toolbox and pressing against the large screen. In a blink of an eye, the entire screen changed into a set of skin. This control method is much more complicated than when we use a mobile phone!

1. Where is the "brain" of the control system hidden?

You may not believe it if you say it.​​The control system of the outdoor LED screen is like an invisible director​​. It mainly divides into two ways of playing:

1. ​​Synchronous control​​: It is equivalent to connecting an extra-long data cable to the screen, and the screen will be displayed in real time when it is broadcast on the computer. This is suitable for live concert broadcasts and real-time updates of traffic information.​ ​High refresh rate of 1920Hz​​It allows the audience a hundred meters away to see the racing track clearly.
2. ​​Asynchronous control​​: Save the video picture into the control card in advance and play it automatically at the point. It’s like installing a timed alarm clock on the screen, which is especially suitable for shopping mall exterior wall screens that only change advertisements every six months, saving power and worry-free.

But now the most fashionable ones are​​Cloud control​​The engineer moved the mouse at the Shenzhen headquarters, and the large screen in Times Square in New York changed the content as soon as possible. This is much more convenient than taking a plane to change the program on site!

2. How much more complex is the operating interface than a mobile phone?

Let’s first take a look at the three core parameters of professional control software:

• ​​Brightness adjustment​​: Outdoor screens should fight against sunlight during the day and avoid light pollution at night. Intelligent systems can be automatically adjusted according to ambient light, for example​ ​Brightness range of 4000-7500cd/m²​​, ensure that the picture will not turn white under the scorching sun and will not be dazzling in the middle of the night.
• ​​Color calibration​​: There is always a color difference when you post the food you took on your mobile phone to your Moments, right? Professional-grade LED control software​ ​Color deviation calibration to 0.1%​​, make sure that the advertiser's red logo is exactly the same on different screens.
• ​​Fault warning​​:pass​​24-hour online monitoring system​​, which lamp bead is about to break down or which power supply is abnormal, the background discovered it earlier than the maintenance worker, and truly realized "preventing the disease".

There is a black technology recently——​​AI automatic optimization algorithm​​. The system can identify key areas in the advertising screen and automatically enhance local contrast. For example, the logo in the sports shoe advertisement will automatically brighten by 20%. This detail adjustment may not be noticed by the naked eye, but it just makes people feel that the picture is more attractive!

3. What should I do if I encounter an emergency?

I saw a thrilling scene with my own eyes on a heavy rain last week: the large screen in a shopping mall was suddenly half black! As a result, the engineer took out his cell phone.​ ​Remotely restarted the faulty module in 5 minutes​​. Here are three life-saving tricks:

1. ​​Dual backup system​​: The screens for important occasions are equipped with two sets of control systems. The main system goes on strike, and the backup system is on top in 1 second.
2. ​​Modular design​​: Like a Lego, if you break it, you will change it. The latest one now​ ​Quick disassembly and assemble the box technology​​, changing the screen is faster than changing car tires.
3. ​​Intelligent dehumidification​​: In humid weather in the south, the control system will automatically heat and drive away moisture, which is more sensitive than the dehumidifiers used in our homes.

If you have a cold knowledge, you may not know: the higher the screen, the simpler the control room. Because the real core technology is integrated into the palm-sized control card, the consoles filled with cool devices are mostly pretending!

4. How will you play with the big screen in the future?

Now even the aunts in the vegetable market know to use their mobile phones to project screens, and of course the outdoor LED control technology is also evolving:

• ​​Gesture control​​: Try your heart to the screen, and immediately switch to Valentine's Day topic. This technology has been piloted in some business districts.
• ​​Environmental interaction​​: The large screen can sense the surrounding temperature, automatically broadcast cold drink advertisements during hot weather, and push umbrella promotions on rainy days, which can be more observant than salesmen.
• ​​Energy-saving mode​​:use​​Common Yin drive technology​​, the standby power consumption is reduced by 50%, and the savings of electricity costs will be enough to install a small screen.

What shocked me the most was the operation of a certain airport - their luggage turntable LED screen can recognize luggage tags, and when your box is about to come out, the screen will automatically pop up the reminder animation. This is not a display screen, it is clearly a caring butler!

Editor's opinion:
After understanding these control methods, I suddenly felt that every large screen in the city was an intelligent life body that could breathe. From the "older phone mode" that saves the program in advance to the "smart phone mode" that can talk to the environment, these luminous giant screens are redefining the concept of "billboard" with technological magic. Next time I wait for the red light, stare at the large screen at the intersection and stare at the big screen. Maybe it's using which control mode it is using now - maybe the backend engineer is drinking coffee and helping you switch the screen twenty kilometers away!

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