Just installed a large LED screen but can’t find a place to input text? Jumping in a hurry? Don't panic! This is like trying to find the volume buttons on a new phone. The key is to find the way around. Last month, I helped the owner of a barbecue restaurant debug the screen. He was stunned and typed on the keyboard on the back of the display for half an hour. Do you think it's coke or not?

​​Pour cold water on it first​​
Not all LED screens can be typed directly! It depends on whether it is equipped with a control card. The most outrageous case I have ever seen - a supermarket chain bought a second-hand screen without a control system at all, and ended up spending an extra 30,000 yuan to replace the equipment. Therefore, these three points must be confirmed when buying a screen:

1. Does the control card model match?
2. Is the software the latest version?
3. Are there any reserved expansion interfaces?

​​Detailed explanation of the three major input channels​​

1. ​​Control card direct connection​​
   Find a matchbox-sized controller (usually on the back of the screen) and connect it to your computer with a USB cable to open the editing software. Here comes the point:

• The resolution should be set to the physical resolution of the screen
• It is recommended to choose boldface or Microsoft Yahei as the font.
• The scrolling speed should not exceed 15 frames/second (otherwise you will feel dizzy)

1. ​​Mobile APP control​​
   High-end models now support wireless connectivity:
   • OTG adapter for Android phones
   • Apple requires a dedicated converter
   • Remember to turn off the screen and Bluetooth to avoid interference

2. ​​Software cloud synchronization​​
   The latest way to play is to edit through the web background:

• Supports collaborative modification by multiple people
• Can set timed playback
• Automatically save in case of power outage or network outage

(I ran into trouble last year when I installed a screen in the gym - I didn't buy a cloud service, so the store manager went to the site every day to change the course schedule. It was only after upgrading the system that the problem was solved)

​​Self-question and answer session​​
Q: How to judge whether the control card can input text?
A: Look at the interface! Those with HDMI or USB-B ports will definitely work, but those with only network cable interfaces will need a converter.

Q: What should I do if the text is not fully displayed after inputting it?
A: 90% of the time the resolution is set wrong! For example: The actual pixels of a P4 screen (256×128cm) are 6400×3200. Setting it to 1920×1080 will definitely cause problems.

Q: What should I pay attention to when entering text on an outdoor screen?
A: Keep in mind the three defense principles:

1. Waterproof keyboard (starting at IP65)
2. Anti-accidental lock function
3. Prevent strong light from making it difficult to see the screen

​​Lessons of blood and tears made public​​

1. Never plug or unplug data cables during thunderstorms (a history of blood and tears that burned three control cards)
2. Don’t use pure white for text color (outdoor screens are bright and blinding, it is recommended to choose #FFD700 gold)
3. Use special symbols with caution (using emoji in a bar caused the system to crash)

Editor's opinion: Nowadays, typing text is no longer as simple as typing on the keyboard. The most amazing gameplay I have ever seen - using somatosensory gestures to write in the air, and the screen displays it in real time. This technology is actually not new. The key is to choose the right manufacturer. Those who have supplied products to international competitions have already mastered the interactive experience. Remember, the input system of a good screen is just like a smartphone, the more you use it, the easier it becomes!

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