Are you worried too? When searching for LED display screens online, hundreds of manufacturers pop up, with prices ranging from 800 to 8,000 per square meter, and they all say theirs is the best. Last week, a small owner of a milk tea shop cried to me. The display screen he bought at a low price started to show color patches after three months, and the maintenance cost was more expensive than the screen. Today we will talk about this troublesome problem——​ ​What kind of LED display is good?​​。

1. Core indicators: Don’t be fooled by the parameter table

Newbies are most likely to fall into the parameter trap. Remember these three lines of life and death:

1. ​​Refresh rate ≥1920Hz​ ​(Below this video is full of water ripples)
2. ​​Brightness attenuation＜15%/year​ ​(A person with a bad screen will become a "yellow-faced woman" in the second year)
3. ​​Seam accuracy ≤0.1mm​ ​(The seam is large enough to fit a bank card)

A gym owner fell into the trap and bought a screen with a brightness of 4000cd/m², but the actual test brightness was only 2800. Let me teach you a trick: Use your mobile phone to download a light metering APP (such as Lux Light Meter) and measure the values ​​in nine areas on the spot. If the difference exceeds 10%, leave immediately.

2. Matching the scene

​​Don’t believe in the universal screen​ ​! Different configurations are required for different uses:

• Milk tea shop menu screen: Select​ ​Indoor P4-P6​ ​, 800cd brightness is enough, saves power and protects eyes
• Shopping mall exterior wall advertising: required​ ​Outdoor P10+IP65 protection​ ​, the brightness should be 5000cd
• Stage floor tile screen: look for it​ ​Pressure resistance 2000kg/㎡+1920Hz refresh rate​ ​, otherwise the dance will be stuck.

Last year, the main stage screen of a music festival used an ordinary rental screen, and it went completely black when the singer stamped his feet. The lessons of blood tell us:​ ​Special scenes require special screens​​。

3. Anti-pit comparison table

special attention​ ​Power module​ ​! A poor power supply will cause the screen to flicker. Here is a test method: After turning on the phone, place your ear against the screen frame to listen for the sound of current. If there is an obvious buzzing sound, return it immediately.

4. Self-question and answer dry goods area

​​Q: Why are the prices of the same size different by 5 times? ​ ​
A: The secret is in the lamp beads! High-quality lamp beads will still have 85% brightness after 5 years, while poor-quality lamp beads will turn yellow after one year. Ask the manufacturer to provide​ ​LM-80 aging test report​ ​, only those with light attenuation value less than 3% are qualified.

​​Q: How to judge after-sales service capabilities? ​ ​
A: When I called at two in the morning and asked to adjust the brightness, it was really reliable for someone to respond within 30 minutes. A hotel customer relied on this trick to find a reliable manufacturer.

​​Q: Can transparent screens really be used as windows? ​ ​
A: Choose​ ​Permeability ≥80%​ ​That’s all! One restaurant installed a fake transparent screen so that the menu could not be seen outside during the day. In the end, it could only be used as frosted glass.

5. Must-see details during factory inspection

1. Touch the sample screen frame to see if there are any burrs (those with poor mold accuracy will scratch their hands)
2. Check to see if there is an automatic placement machine in the workshop (don’t buy one if you are soldering lamp beads manually)
3. Check the driver IC brand on the material shelf (the ones marked are all unknown brands)
4. Ask about the power cord specifications (outdoor screens must use 3×4mm² wire)
5. Test grayscale transition (65536 levels of gradient from black to white)

During the acceptance inspection of a shopping mall, it was found that the red display was orange. Later, it was found that inferior red lamp beads were used. Remember: Put a hundred-dollar bill in front of the screen to see if the reflective color of the metal thread on the real bill is correct.

After working in this business for ten years, I have seen too many people take advantage of others and suffer big losses. Let me tell you something from the bottom of my heart:​ ​Buying an LED screen is like buying glasses​ ​, looking at similar things, I didn’t know whether it was good or not until I wore it for three months. Remember to ask the manufacturer for one next time you purchase​ ​Aging test video​ ​——If I dare to show you a video that lights up continuously for 72 hours, the quality is accurate.

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