Ouch hey! Dear friends who have just entered the industry, let’s talk about some interesting topics today——​ ​Where is the antenna of the LED display hidden in?​​? This is a question, I was scratched when I first came into contact with this industry. You said that such a large screen, why can't you find the antenna? Could it be that invisibility? Don’t worry, let’s slowly peel off its “coat” and see what’s going on!

1. Antenna? LED screens are not mobile phones, so what do you want to do with antennas?

​​Don't be confused first! ​ ​ We have to figure out why LED displays need antennas. Many people think that only mobile phones and routers can use antennas, but in fact they are very wrong! LED displays are no longer "silly", and many high-end models support​ ​Wireless control​​、​​Remote data transmission​​even​​Real-time content updates​​. For example, the scrolling advertisements you see at a subway station may be updated through wireless networks.

For example, our company has installed a large outdoor screen for a commercial center. Customers can use their mobile phone to adjust the playback content when sitting in the office. This is all reliable behind it.​​Wireless module​​Working with its antenna!

2. Where is the antenna hidden? Three common locations revealed

1. ​​Hidden near the control card​​

The "brain" of the LED screen is a control card, and the antenna is often stuck next to it. If you remove the inspection cover behind the display screen, follow the control card and you will most likely see one​ ​Metal sheets of matchbox size​​or​​Spiral small parts​​, this is the antenna!
​​Why put it like this? ​ ​ The control card needs to receive signals. The closer the antenna is, the more stable the signal is. Just like your Wi-Fi router in your study, the signal in the bedroom is almost meaningful, right?

2. ​​Hide in the receiver box​​

If it is a long-distance transmission LED screen, such as installed on a stadium fence, you will find that there is a low-voltage room.​​Metal box as big as a palm​​. This thing is called a signal receiver, and the antenna is integrated into its shell, and sometimes it also has a small tail.​ ​External antenna​​。
​​Give a real case​​: The fence screen we made for a Japanese stadium, the receiver box is hidden under the audience seat, and the antenna is specially made into an arc to perfectly avoid signal interference from the metal structure.

3. ​​Transformed into "Invisible Man""​​

The black technology is even more amazing now! Some high-end screens directly use the antenna​ ​Make it into a PCB board​​or printed on the border with conductive ink. You can't see it when you stare at the screen for a long time, but the signal is still full.
​​Technical control attention​​: This kind of "stealth" antenna requires extremely high process requirements. It must be superimposed with more than six-layer circuit boards and must be subject to anti-oxidation treatment. It is not something that any factory can do.

3. Doorway for antenna position design

​​Outdoor screen: Waterproof and lightning protection are the key​​

Like our company exports outdoor advertising screens in Southeast Asia, the antenna is either hidden in​​Waterproof junction box​​or installed on top of the screen​​Under the lightning rod​​. Why? Tropical rainstorms come as soon as possible, and if the water enters, you will stop when the food is stopped!
There is a negative textbook: Last year, a competitor installed the antenna at the bottom of the screen, but the signal was interrupted during the rainy season. Finally, the investigation found that the ants built a nest at the wiring port.…

​​Indoor screen: Beautiful is the king​​

The transparent window screen in the mall is often integrated into​​Aluminum alloy frame​​inside. The engineers have to ensure the signal and not destroy the 88% transmissibility. The engineers have scratched their hair a lot!
​​Industry cold knowledge​​: Now some creative screens make the antenna into decorative patterns. For example, the floor tiled screen we made for a Korean brand store, the antenna is directly integrated into the metal etching of the cherry blossom pattern.

4. Find the antenna yourself? Pay attention to these three points!

1. ​​Power off first! ​ ​ Don’t just look like a Wi-Fi antenna, the working voltage of the LED screen is much higher than that of the router.
2. ​​Look at the interface type​​: Common ones include SMA interface (round head with thread) and IPEX interface (flat small socket), don’t force it!
3. ​​Signal testing skills​​: Turn on the hot spot to close to the suspected position. If the screen signal strength changes significantly, 80% will find the right place.

​​Say something embarrassing​​: My apprentice once used the metal cover of the cooling fan as the antenna and poked it with a screwdriver for a long time, but the result... guess what? The control card is burned!

5. Future trend: Can antennas be "laid off"?

Now in the industry​​Visible light communication​​and​​Millimeter wave transmission​​. For example, the new technology that our laboratory is testing, directly using LED lamp beads to emit signals, saving even the antenna! However, the cost at this stage is too high, and it is estimated that it will take three to five years to become popular.

​​Personal opinion​​: The antenna is like the "invisible wings" of the display, invisible but important. Next time you see a large LED screen, you might as well take a look at it - maybe a small bulge you are staring at is the secret weapon that makes it fly!

Okay, that’s all for today. If your company just bought an LED screen and couldn't find the antenna position, don't panic! Remember three points:​ ​Find control cards, check receivers, and look at process design​​. Really can't handle it? The 24-hour technical hotline is waiting for you - our engineers are all born as "antenna hunters"!

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