Oh, what if I just bought the LED large screen that I can't connect to the computer? Have you encountered this situation too - the computer host is densely packed with interfaces, HDMI, DP, and VGA are so dazzling. Which port can make the large screen light up? Don’t panic, today we will break it and talk about this matter, keep it so that you can hear it clearly.

1. Can't recognize the computer interface? Look at these key positions first

Nowadays, there are at least three types of video output ports hidden behind the mainstream computer host. You can take a flashlight and the flat, trapezoidal notch is called HDMI, the rectangular side may be a DP interface, and the old computer will have a blue VGA port. The key point is:​ ​Today's LED displays use HDMI or DP interfaces​​It's like a charging cable for a mobile phone. It's right to identify these two.

There is a real case. Last year, a man forced his VGA cable into the COM port, but he failed to touch it. Later, the technician came over and looked at it, and smiled and slapped his thigh: "This interface is connected to the printer. Are you trying to ask the display screen to help print files? "

2. The wrong wire selection, the picture becomes abstract

Don’t think it can be used by just pulling a thread. It’s too big. Last year's industry report showed that 38% of display failures were caused by wire quality problems. Remember these three key points:

• ​​The wire version needs to be matched​​: HDMI2.0 can only drive 4K@60Hz
• ​​Line length is more than 15 meters​​: Ultra-long-distance signal attenuation is not a joke
• ​​The shielding layer must be solid​​:Pinch the thread body, throw it away as soon as possible if it is too soft

For example, in the engineering case of a professional manufacturer in Shenzhen, customized wires with magnetic rings were used for the arc-shaped large screen installed in the shopping mall, but there was no signal interference problem in three years. This is the same as wearing shoes, only those who fit their feet can run far.

3. Driver settings hide great questions

Inserting online is just the first step, and the key point is still to come. When pressing win+P to call up the projection settings, don't select "Second Screen Only" quickly, otherwise your main monitor will go on strike. It is recommended that novices use it first​ ​Copy mode​​, wait until the debugging is done before switching to the expansion mode.

Here is a cold knowledge:​​The refresh rate of professional-grade LED screen can reach 1920Hz​​, more than ten times higher than ordinary monitors. But to achieve this performance, you have to set it manually in the graphics card control panel. Just like driving a sports car and moving in the low speed gear, it must be awkward.

4. The resolution is wrong, the picture becomes mosaic

When the picture is blurred, the resolution is probably not set correctly. Teach you a trick:​ ​Check the physical pixel spacing of the display first​​. For example, for P2.5 screen, the corresponding resolution of 1920x1080 should be 4.8 meters x 2.7 meters. If you force the 4K signal into a small-sized screen, the picture will look like it is being clipped by a door.

There are manufacturers who do stage rentals, and their quick disassembly and assembly boxes come with resolution adaptive functions. I heard that once a temporary screen change was replaced, the engineer adjusted the parameters in two minutes. This technique is indeed great.

5. Color management is the ultimate test

Don’t think that the picture is done when it is lit. Whether the color is accurate or not directly affects the viewing feeling. Professional-grade LED screens can be realized​ ​Brightness adjustment of 800-1200cd/m²​​, this parameter must be matched with the on-site ambient light. The high-brightness mode must be turned on in the mall during the day, and the brightness must be lowered during performances at night, which is the same as the automatic brightness of the mobile phone.

I remember that there was a cafe project last year, which was equipped with a transparent screen with a transmittance of 86%. During debugging, the white background was adjusted to a warm tone, and the entire space instantly had a Starbucks atmosphere. Therefore, color management can truly turn decay into magic.

6. Frequently Asked Questions First Aid Kit

Finally, I’ll give you a tip and check it yourself when you encounter problems:

1. Black screen? Check if the power indicator is green
2. Swirl screen? Try changing the wire
3. Color offset? Enter the graphics card to restore the default
4. Stuck and stopped? Confirm whether the signal line is transmitted over specifications

A friend’s story is very funny. The second-hand screen he bought always flashes, and all kinds of debugging are not possible. Finally, I found that the power socket was in poor contact, so I changed the plug-in and got it done immediately. So, don’t just focus on advanced settings, and basic checks must not be missed.

I want me to say that playing with the connection between LED display and computer is like learning to ride a bicycle. You may fall twice at the beginning, but after you figure out the trick, you will find that it is just an interface setting. Next time you encounter a problem, take a deep breath and follow the steps step by step to ensure that you can become a technical expert in your circle of friends. Remember, if you have a good horse and a good saddle, you have to find professional people for professional things. Those manufacturers that have passed ISO certification have much more effective after-sales technical support than Baidu.

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