Have you ever wondered how those moving advertising images on the exterior walls of shopping malls are controlled? Who is directing the score numbers that are updated in real time in the stadium? Today we will lift the mystery of the LED display and take a look at the control methods behind it - don’t worry, even if you are a newbie, you will become half an expert after reading this article!

Three King Kongs of Control System

To put it bluntly, the control of the LED display is like a band conductor, with three key roles:

1. ​​Hardware Commander (Controller)​ ​: This iron box is equivalent to the brain of the display screen, hidden on the back of the screen or in the control room. It can handle more than a dozen signals at the same time. Like the distributed processor used in our company's products, there will be no lag even if 50 screens are linked at a concert.
2. ​​Software operator (control program)​ ​: Dual control via web page and mobile APP is now popular. For example, when changing promotional advertisements for shopping malls, the store manager can synchronize the changes to the LED screens in all stores by changing the content on his office computer, which is much better than carrying a USB flash drive around in the past.
3. ​​Signal courier (transmission network)​ ​: 5G and WiFi6 are really a big help! In the stadium fence screen project we did for Southeast Asia last year, the referee pressed a button and pushed slow-motion replays to four large screens in 0.3 seconds, faster than the blink of an eye.

How to set up a stage with hardware

Someone may want to ask: What exactly does the controller look like? Let’s put it this way, if you take apart the back cover of our outdoor advertising screen, you will see three key components:

• ​​receiving card​ ​: Equivalent to the ears of the display screen, specifically listening to the controller's instructions
• ​​Power module​ ​: A voltage regulator that accurately supplies power to each LED lamp bead
• ​​Cooling system​ ​: Fan unit with intelligent temperature control, which does not stop even at high temperatures of 40°C in summer.

To give a real example: the ring screen made for the Tokyo Stadium last year required 238 receiving cards to simultaneously control 120,000 lamp beads. During debugging, the engineer discovered that​ ​Set refresh rate to 3840Hz​ ​, there will be no smear on the screen when fans wave flags quickly, this parameter has now become a new benchmark in the industry.

Is software really that difficult to operate?

What novices fear most is probably the control software. In fact, the current system has been made fool-proof. Remember these three steps:

1. ​​even​ ​: Connect the computer and controller using network cable or wireless
2. ​​drag​ ​: Drag the designed poster directly into the software interface
3. ​​tune​ ​:Sliding bar to adjust brightness, as simple as a mobile phone screen

There is an interesting story from a catering customer: the menu screens of their 20 branches were originally going to be modified one by one, but later they used our​ ​Cloud control solution​ ​, the headquarters changes the picture of the dish, and all stores automatically update, saving more than 300 hours of labor every month.

FAQ First Aid Kit

Don’t panic when you encounter a black screen, check these three things first:

1. Is the power indicator light green?
2. Is the network cable interface loose?
3. Check whether the software version is the latest

The transparent display screen we repaired for a Korean customer last month is a typical example: the screen looked black, but it turned out that the clerk accidentally touched it.​ ​Night energy saving mode​ ​, and it will be restored with two clicks on the mobile APP. So, 90% of failures are actually minor problems.

How will the future play out?

Let me say that LED control is making breakthroughs in two directions:

• ​​Intelligent sensing​ ​: The screen automatically recognizes the direction of the flow of people and adjusts the content.
• ​​Cross-screen interaction​ ​: Just shake your phone and the video will be displayed on the big screen

The smart city projects we are working on recently are very interesting: the display screens at bus stops can recommend merchants according to weather changes, promote umbrella advertisements on rainy days, and promote cold drink promotions on hot days. This is the real​ ​Scenario-based intelligence​​。

Understand these ways, and you will definitely smile when you see the changing images on the large LED screen next time - it turns out that the secret of controlling it is hidden in that inconspicuous little black box. In terms of industry trends, I think future control technology will be more like smart butlers, who understand both hardware performance and people's hearts. This is the real display revolution!

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