Have you also encountered this situation? I turned around three times in front of the mobile LED screen, but I couldn't find the USB port. Don't worry, the design of this thing is much more exquisite than the charging port of a mobile phone. Let's take a look at these "treasure spots" today.

1. Finding an interface is like playing an escape room

(Remember this rule first) The USB ports of mobile screens don’t like to be exposed. They are usually hidden in three "secret bases":

1. ​​Control card's lair​​
   More than 90% of mobile screens have the interface installed next to the control card. This iron box is usually hidden on the back of the screen. Some models will also thoughtfully come with a USB extension cable, which is like installing a telescope for the interface, allowing you to easily plug and unplug it without disassembling the phone.

2. ​​Box seams​​
   There are often interfaces hidden at the seams of the aluminum-magnesium-zinc boxes of rental screens. Here is a little trivia:​ ​The interface of high-end models will be made into a magnetic flip cover​ ​, waterproof and dustproof without affecting the appearance, just like an invisible door.

3. ​​Side hidden compartment​​
   For special shapes such as stage floor tile screens, the designer will hide the interface in the side groove. Last week I saw a dance floor screen. The interface cover has a fluorescent logo that can be found by touching it in the dark. Is this thoughtful design?

2. Why do designers hide it so much?

(This is not meant to make things difficult) There are many ways behind the scenes:

• ​​Anti-accidental touch design​ ​: Most of the interfaces of outdoor screens have locks, and you need to use special tools to open them. You are afraid of naughty children inserting U disks randomly.
• ​​line invisibility​ ​: For products such as transparent video walls, the interfaces are hidden inside the support frame. From a distance, it looks like the screen is displayed out of thin air.
• ​​Quick disassembly and assembly​ ​: The interface of the rental screen is modular and can be plugged in and out in two seconds, which is easier than changing a mobile phone case.

Let’s take a real case: The fence screen interface of a certain gymnasium is designed on the top of the column, which is rain-proof and easy to maintain. The maintenance master calls it an expert.

3. Competition between Type-C and traditional interfaces

(Attention if you are planning to buy a screen) There are two popular interface configurations on the market:

Nowadays, high-end mobile screens are beginning to use Type-C. After all, people can charge their devices while transmitting 4K videos. But a word of caution:​ ​When choosing Type-C, remember to check whether it is the full-featured version.​ ​, some castrated versions can only charge but cannot transfer data.

4. Maintaining doorways is more important than finding interfaces

(Private experience of a master chef) Finding the interface is only the first step, maintenance is the highlight:

1. ​​Anti-oxidation three-piece set​ ​: Coat the interface with Vaseline + silicone dust plug + monthly power-on test. These three tricks can make the interface last three years longer.
2. ​​extreme weather protection​ ​: Do not plug or unplug directly when the temperature is minus 20°C. Use a warm baby to heat the interface first (don’t laugh, Northeastern customers really do this)
3. ​​transmission habits​ ​: Connect a backup power supply when transferring large files to prevent sudden power outage from burning the chip.

Last year, there was a negative teaching material: the interface of an interactive screen in a shopping mall got dust, resulting in poor contact. During maintenance, spider webs were found growing in the USB flash drive port. No one did this maintenance well.

5. The future interface may look like this

(Technology Changes Life Preview) These black technologies are spreading wildly in the industry:

1. ​​wireless transmission interface​ ​: With NFC sensing area, you can transfer files by just touching your phone
2. ​​Self-healing contacts​ ​: The interface can be automatically filled with conductive material after scratching
3. ​​Photovoltaic charging port​ ​: When plugging in a USB flash drive, you can recharge the screen by the way.

I heard that some manufacturers are already testing laser projection interfaces, which directly cast a light spot on the screen as a touch area. If this is done, it is estimated that even the physical interface will be eliminated.

Editor's opinion: To be honest, many manufacturers are still resting on their laurels in interface design. For a truly professional mobile screen, the interface must be well hidden and easy to use, just like​ ​Interface module with intelligent temperature control​ ​, automatic heating to prevent freezing in cold weather, this kind of detail shows real skill. Next time you are looking for a connector, you might as well touch the seams of the frame and you might find something unexpected. Remember, the standard for a good interface is just eight words - "can be found, can be plugged in, and can be transmitted quickly"!

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