Alas, I went to the customer to debug the large screen last week and encountered something funny and funny - the boss insisted on connecting the LED screen with the hot spot of the mobile phone, but the event site was directly stuck to PPT. Let's talk clearly today.​ ​How to control LED screens is reliable​​？

1. The "three troika" of the control system"

Let’s first understand that there are three mainstream control methods now:

1. ​​Wired control system​ ​(suitable for fixed installation)
   • Advantages: As stable as an old dog, the first choice for large-scale event sites
   • Disadvantages: Troubleshooting (the longest signal line I have ever seen has dragged 200 meters)
2. ​​Wireless control system​ ​(Recommended for temporary activities)
   • Tips: Choose automatic switching with dual-band (2.4G+5G)
   • Avoid pits: Don't believe in the transmission distance of 500 meters, and the actual measurement will be stable within 100 meters.
3. ​​Cloud control system​ ​(Favorite in mall advertising screen)
   • Highlights: Can remotely modify the playback content (can avoid running on site)
   • Note: You must be equipped with a local controller (to prevent disconnection of the network and blindness)

For example, last year, the main stage of the music festival used triple backup - wired main control + wireless backup + 4G cloud control, and it was still stable in heavy rain.

2. Hidden parameters of the controller

Don't just look at the price, these parameters are the lifeblood:

• ​​Refresh rate ≥1920Hz​ ​(Avoid water ripples when taking pictures)
• ​​Loaded pixel points ≥2 million​ ​(It will be stuttered below this number)
• ​​Support HDR10+​ ​(The layering of the picture is three times different)
• ​​Protection level IP65​ ​(Outdoor rainproof and dustproof)

There is a detail that a person in the industry understands:​ ​Look at the controller cooling fan​ ​. A good controller uses ball bearing fan, without lag for 50,000 hours ； Oil-sealed bearings are used for cheap goods, and they will be buzzing in half a year.

3. Fatal details during installation

Last week, I helped my friend save the situation. If you find these problems, don’t commit them:

1. ​​Power interference​​
   Controller and audio share circuit? Wait for the screen to flash snowflakes! Professional practices:

   • Pull 380V power supply separately
   • Install power filter
   • Ground resistance ≤4Ω

2. ​​Signal attenuation​​
   Repeater must be added if the transmission exceeds 50 meters. A shopping mall suffered a loss, and the 80-meter HDMI cable did not add an amplifier, so the image was seriously shaking.

3. ​​Software Matching​​
   The controller and playback software are like couples - they have to match! The most outrageous thing I've ever seen:

   • 4K controller with 720p software
   • The picture quality is not as good as that of the elderly

To be honest, the money in the control system is really not saved. Last year, a customer bought a second-hand controller with a cheap price, but the screen was black on the day of the event. Not only did he pay the venue fee, but his brand image was directly 50% off. remember,​ ​A good controller is like an old driver - you can stop and run steadily at critical moments​ ​. Next time I see those LED screens with smooth graphics like Dove Advertising, most of them spend money on a dual backup control system. This thing is like buying insurance - it's usually expensive, but it's so good to have an accident!

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