Do you know? When you stand in the business center and look up at the shocking naked-eye 3D screen, or when you are browsing the background wall where the music changes color with the internet celebrity live broadcast room, there is a "invisible commander" hidden behind it - this thing is like a chip in a mobile phone, but many people don't even know where it is installed. Recently, a fan sent a private message asking: "How can novices quickly master the core technology of LED screen control cards? "Today we will explore the "brain" hidden behind the screen.

​​What is the screen control card?​​
Imagine you go to KTV to sing, and the song ordering station suddenly crashes, and all the screens are stuck in mosaics - this is probably because there is something wrong with the card control. Simply put, this palm-sized circuit board is the nerve center of the entire LED display system. It has to do three major things:

1. Translate the video signal in the computer into a language that can be understood on the screen
2. What color should be used to direct thousands of LED light beads?
3. Automatically adjust the brightness according to the ambient light (for example, the outdoor screen will brighten itself during the day)

Last year, a shopping mall in Tokyo had an embarrassing incident: because of the use of inferior control cards, the entire advertising screen suddenly turned into a snowflake point during the countdown to the New Year, and hundreds of mobile phones on the scene captured this embarrassing moment.

​​Where is this "brain" hidden​​
The most common misunderstanding for beginners is looking for control cards all over the screen. Actually it's not on the screen at all! There are three common ways to hide:

• Installed in the control cabinet behind the screen (like the computer host case)
• Integrated in the sending card (like an external device that is a USB drive-sized)
• Directly on the receiving card (the most popular method now)

Take a look at the transparent window screens in the mall that change patterns. Their control cards are usually hidden at the bottom of the display cabinet and are wrapped tightly in an aluminum alloy shell. There is a cold knowledge: a good card control case should be warm to the touch. If it is hot, it means that the heat dissipation design is not up to standard.

​​What hard indicators should be used to select a card?​​
There are many products on the market now, so remembering these three key parameters is absolutely correct:

1. ​​Refresh rate​ ​: At least 3840Hz or above, otherwise there will be water ripples when shooting videos.
2. ​​With load points​ ​: A single card can control 300,000 pixels to be considered qualified
3. ​​Grayscale​ ​: 16bit is the basics, professional-level can achieve 20bits

There is a very interesting comparison: ordinary card control processing 4K videos is like climbing a classic car, but high-end products can render 8K content in real time. After upgrading equipment at an e-sports hall in Seoul last year, the audience said, "Watching the game is like operating with your own mouse."

​​How to troubleshoot common faults by yourself​​
When you encounter a flower screen, don’t rush to ask for repairs. Try these three steps first:
① Check whether the network cable connector is oxidized (many problems are here)
② Touch the temperature of the card control case (heat dissipation is required if it exceeds 60℃)
③ Check whether the power indicator light is normal (the red light is always on = power failure)

I remember a case: The spherical screen of a science and technology museum in Shenzhen suddenly turned green locally, and finally I found that the card control program was reset by a naughty child. Remember to set a password for the card control program during daily maintenance, many novices don’t know about this.

Recently, it has been rumored in the industry that there was a 0.5-second delay during live broadcast of an international event. Later, it was found that the signal compression algorithm of the card control is too old. What does this mean? When choosing a control card, you cannot just look at the current needs, you must reserve 20% of performance redundancy. Next time I see the big screen in the mall suddenly black. Don’t just take photos and post them on Moments. Maybe you are witnessing a card-controlled retirement ceremony.

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