Ouch hey! Master Li, who just entered the industry, recently made a big joke - when installing LED advertising screens for the mall, he held the control card and couldn't find the interface, and was so anxious that he was sweating. Don’t laugh, this newbies have probably fallen into it! Today, let’s talk about the key positions of the LED advertising screen.

1. Control card is the interface base

Last week, I saw a scene of a crash: a newly installed P4 screen in a square was found to be inconsistent with the video interface during debugging. ​ ​Remember these three hiding points​​：

• ​​There must be a mystery on the back of the control card​ ​(Standard configuration of HDMI and DVI digital interfaces)
• There is a lifeline hidden on the side of the power box (the AC 220V input port must be identified)
• The expansion port is reserved at the bottom of the box (net and serial ports are often found here)

To give a real case - last year, the engineer found a hidden waterproof interface on the side of the aluminum alloy box. This design is both rainproof and avoids accidental touch, and it really makes you understand the details.

2. The interface type determines the lifeblood of the picture

Don't be fooled by sales,​ ​Identify these five great kings​​：

1. ​​HDMI port​ ​: The leader in 4K video transmission, one line to get the audio and video synchronization
2. ​​DVI port​ ​: Old-fashioned digital interface, the picture quality is as stable as an old dog
3. ​​Net port​ ​: It depends on its transmission over 50 meters, and its anti-interference ability is max
4. ​​Power port​ ​: Don’t look stupid, but you can burn the board in minutes by connecting the wrong positive and negative poles.
5. ​​Expand the serial port​ ​: Debugging artifact, the killer weapon of professional masters

Have you heard of that classic crash case? A shopping mall opened a large screen to broadcast promotional videos. Later, it was discovered that it was using the VGA interface to transmit 1080P signals. If I want to say, those who are still trying to fight simulation interfaces these days are just digging a hole for themselves.

3. You have to talk about military skills when finding an interface.

Three fatal mistakes that novices often make:

• No waterproof cover is covered when operating in rainy days (IP65 protection becomes a decoration)
• Electric plug-in and unplug interface (Martians are not a joke)
• Ignore the ground terminal (static accumulation will cause color shift)

Last year, a smart park project in Shenzhen suffered a great loss - the plum rainy season interface was flooded, and the flower screen of the entire screen looked like an abstract painting. Later, the manufacturer made a tough move: install silicone sealing rings at all outdoor screen interfaces, and finally cured the headache of the operation and maintenance personnel.

4. Hidden levels reveal the secret

Let me talk about industry cold knowledge: the interface of high-end screens may be hidden in places you can't imagine!

• The interface of the curved screen is often on the inside of the curve
• The sockets of floor tiles are mostly located in the four corners of the box
• For the sake of aesthetics, the transparent screen will integrate the interface into the border.

Do you remember the transparent window screen of a department store in Seoul two years ago? The manufacturer has made the signal interface into a magnetic quick disassembly structure, and there is no need to disassemble the entire screen during maintenance. This design really brings the wisdom of lazy people to the extreme.

Speaking of this, I suddenly remembered something - some manufacturers castrated all the interfaces they should have in order to save costs. I have to say that when selecting a screen, be sure to confirm whether these three interfaces are complete: at least 1 HDMI2.0, 2 Gigabit network ports, and 1 set of emergency power interfaces. If you miss any one, you will definitely get rid of the subsequent upgrade!

Personal opinion: Finding an interface is like playing escape room. You must understand the principles of technology and observe the details. Those manufacturers who design interfaces to be both concealed and easy to operate are the ones who really take the user experience seriously. Next time I meet a screen hidden in an anti-human interface, I will directly confront the manufacturer: Is your design preventing users or thieves?

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