Hey, have you also encountered this situation - the LED screen you spent a lot of money to install is hard to see due to the reflection during the day, and turns gray at night? Let’s chat today,​ ​What is the difference between a good screen and a bad screen?​ ​, after reading this article you will become half an expert!

1. Pixel spacing: see if there is any "mosaic" at a close distance"

​​Core question: Why do some screens look grainy when viewed up close? ​ ​
It depends​ ​Pixel spacing (P value)​ ​, which is the distance between adjacent lamp beads. Give a chestnut:

• ​​P1.53​ ​The screen is as delicate as a 4K TV when standing 2 meters away
• ​​P2.5​ ​The screen starts to become mushy when it exceeds 5 meters.

​​Industry data​ ​: It is recommended to choose indoor screens below P2.0, with a starting pixel density of 250,000 dots per square meter, and 1080P high-definition effects can be achieved in 6 square meters. Like the interactive advertising screens in shopping malls, if you can see pixels when you get closer, it’s definitely cutting corners!

2. Brightness adjustment: Can you see clearly under the sun?

​​Core question: Why does the outdoor screen seem to be foggy in broad daylight? ​ ​
A good screen must do the following:

• ​​Indoor 800-1200 nits​ ​: Not dazzling but able to see details clearly
• ​​Starting at 4000 nits for outdoor use​ ​: The screen does not turn white under the noon sun.

There is one​ ​Industry Insider​ ​: Inferior screens will falsely mark brightness! Let me teach you how to detect dirt - point your phone camera at the screen. If black ripples appear, it means the refresh rate is not enough. ； If there are obvious color gaps, the brightness parameters are definitely watered down.

3. Refresh rate: why there are always "water ripples" when shooting videos"

​​Core question: Scan lines always appear when taking pictures of LED screens with mobile phones? ​ ​
This is similar to​ ​refresh rate​ ​Directly related to:

• ​​≥1920Hz​ ​: Shoot 4K videos completely without flicker
• ​​＜1000Hz​ ​:Dynamic pictures have serious smearing

Last year, a concert was overturned. The sequins on the singer's clothes turned into a mosaic during the live broadcast. It was because of the low refresh rate! Nowadays, high-end screens can achieve 3840Hz, which is 30% more expensive than ordinary screens, but performance-level projects must have this configuration.

4. Protection level: Will there be a short circuit on rainy days?

​​Core question: Who is responsible for the outdoor screen being damaged after half a year of use? ​ ​
Look at three key indicators:

1. ​​IP65 waterproof​ ​: Can withstand heavy rain washing
2. ​​-40℃~85℃ temperature control​ ​: The screen will not go black despite the freezing rain in Northeast China
3. ​​Lightning strike protection design​ ​: Don’t be afraid of being struck by lightning during the rainy season

There is one​ ​Lessons of blood and tears​ ​: The screens installed in a certain subway station were not treated with moisture-proof treatment. During the rainy season, mold appeared on the circuit boards. The maintenance fee was enough to buy three sets of new equipment! So don’t save this money.

5. Color consistency: Why do some screens look like "big painted faces""

​​Core question: On the same screen, the left side is bluish and the right side is reddish? ​ ​
A good screen should do the following:

• ​​Color difference＜3nm​ ​: Red, green and blue colors are completely aligned
• ​​16bit color depth​ ​: Can display 281 trillion colors

​​Detection Tips​ ​: Ask the manufacturer to print an all-white screen and compare it with an A4 paper - if it turns yellow or blue, it's a defective product! Then cut to a pure black screen. A high-quality screen should be as pure black as if the phone is turned off.

Personal opinion: Maintenance is more important than buying equipment

After working in this industry for more than ten years, I have seen too many cases of good screens being used up. Three pieces of advice:

1. ​​Monthly dust removal​ ​: Dust will reduce brightness by 15% per year
2. ​​Physical examination before rainy season​ ​: Focus on checking the oxidation of the power interface
3. ​​Content adaptation​ ​: Don’t play 4K video sources on a screen smaller than P4

There is a new trend in the industry recently——​ ​Environment adaptive screen​ ​, which can automatically adjust the color temperature according to the intensity of sunlight. This kind of screen is 20% more expensive initially, but it can save 30% of electricity bills in five years. You can focus on checking this feature next time you purchase!

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