Dear friends who are staring at the huge screen of the mall, have you ever thought that these LED screens that are dozens of meters long will be stuck when playing content like files transmitted by mobile phones? Especially when you see the real-time barrage "growing" from the bottom of the screen at the concert, are you muttering in your heart: "How did this data run backwards?" Today we will lift up this technical underwear, and you will be able to chat with the decoration master for half an hour after watching it.

Let me tell you something unusual first

In fact, the data transmission of the LED screen is like a centipede walking, and the front and back legs must be coordinated to move. During normal playback, the data "climbs" from the sending card to the screen, but when real-time feedback is needed (such as the temperature in a certain area is too high), the data must be "climbs" backwards. This leads to three core technologies:

​• Bidirectional driver chip (special forces that can collect and send)​​
​• Redundant circuit design (make several more escape channels)​​
​• Millisecond response mechanism (response faster than blinking)​​

The floor tiled screen made for a certain International Electronic Music Festival last year is a typical example. The DJ gestures should be captured in real time to control the lights, and the data reverse transmission delay must be controlled within 3ms. The final plan used 64 sets of redundant signal channels, and the data was transmitted back with the temperature sensor. After three consecutive nights, there was no lag.

The secret in hardware

​​1. The lamp bead must be able to "talk"​
Ordinary lamp beads only emit light, and high-end products also come with status feedback function. The fence screen we made for a stadium in Tokyo, each lamp bead can transmit working temperature and voltage fluctuations data back to the control center. Once, a typhoon day monitored an abnormal temperature rise in a certain block, and the system automatically cuts off power to avoid a short circuit accident.

​2. The driver chip must be a double-faced spy​
A good driver chip can not only direct the light beads to shine, but also collect fault information. For example: When a pixel point has abnormal brightness for 5 minutes, the chip will immediately reverse the coordinate code to the control system, and the accuracy can reach ±0.5mm.

​3. The box contains a signal highway​
The aluminum-magnesium-zinc alloy box is not only an outer shell, but also an eight set of data loops embedded inside. The arc-shaped advertising screen made for Singapore uses a spring pin connector to transmit data between the boxes. Even if the child is hit by 15 degrees, the signal can still be transmitted backwards.

Software is the real brain

Now let’s talk about your most confused part - how to play data backflow in the control system. There are three common questions:

• Data traffic jam (multi-channel signal fight)
• Information lost (return path cannot be found)
• Feedback delay (like the circles when the network card)

The solution we have made for a smart city project is very interesting: add "data traffic police" to the control system to allocate the forward and reverse transmission bandwidth in real time. Forward transmission during peak periods accounts for 90% of the channels. When encountering fault warning, the reverse channel can instantly grab 60% of the bandwidth to ensure priority delivery of alarm information.

Self-question time

​​Q: What is the biggest difficulty in reverse data transmission?​​
To give a practical example: the transparent window screen made for a shopping mall in Seoul must transmit the touch data of each piece of glass back while maintaining an 86% transmissibility. Finally, a micro circuit was engraved on the edge of the glass, and the data went to "high-speed edge" without blocking the line of sight, and the error touch rate was controlled at 0.03%.

​​Q: How do ordinary users judge whether the device is good or bad?​​
Teach you a way to quickly sweep the surface of the screen with your palms. A good reverse transmission system will generate a thermal map within 0.5 seconds, displaying the temperature change trajectory at the control end. The interactive screen we made for the Science and Technology Museum is just playing, so naughty children can "draw" light tracks with their palms.

Editor's opinion time

If I want to say, data transmission is like installing a nervous system on an LED screen. I have seen too many tragic cases: the screen of a bar was discovered three hours after it crashed, and the passenger flow was lost all night. Compared with the aviation display screen we made for the airport, we did not receive a reverse heartbeat signal in just 5 minutes, and the backup system immediately took over.

Remember to ask the supplier three fatal questions when choosing a device:

1. How fast is the data return to the fastest?
2. Can you call the alarm independently when the network is disconnected?
3. Will the system still recognize the old data in five years?

So remember, reliable technical services are not just about buying a piece of equipment. Just like the 7×24-hour data monitoring center we prepared for customers, the last time a project in Dubai encountered a sandstorm, the reverse transmission system warned about temperature abnormalities two hours in advance, which prevented the screen worth tens of millions from becoming bricks - this is the real skill hidden in the technical parameters!

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