A few days ago, I was helping Lao Wang, who runs a milk tea shop, choose an advertising screen. The supplier said, "This is a P3 screen." Lao Wang secretly asked me, "What exactly is this P3 screen?" "Today we broke it apart and crushed it into pieces.​ ​5 minutes to turn you into a human flesh detector​​！

1. The secret hidden in the pixels

The P value is actually the distance between the center points of the two lamp beads, in millimeters. ​ ​P3=3mm pitch​ ​, P4 is 4mm, remembering this is half the battle. But there is something counter-intuitive here:​ ​The smaller the P value does not mean the better the image quality.​ ​, depends on the viewing distance. It's like feeling dizzy when watching IMAX in the first row of a movie theater. It's the same truth.

For example: Most of the advertising screens in the subway passages are P6-P10, because passengers are rushing past 2 meters away. If you switch to a P2.5 screen, it will look like a mosaic - this is why the stadium fence screen dares to use P16, because the auditorium is far away!

2. The human eye is the ruler

Want to know the P value of a ready-made screen? ​ ​Stretch out your hands​ ​The most reliable:

1. Straighten your arms as an "OK" gesture
2. Use your thumbnail to align adjacent lamp beads
3. Count how many lamp beads can be packed into 1 cm
   • Stuff 4 →P2.5
   • Stuff 3 →P3.3
   • Stuff 2 →P5

Last year, a shopping mall in Tokyo conducted a test and asked customers to use this method to guess the P value. The accuracy rate was 78%! However, it should be noted that this method does not work for ultra-fine pitch screens (below P1.5), so professional instruments must be used.

3. Guide to purchasing pit prevention

The P value mentioned by the merchant may be watery. Let me teach you.​ ​Three tips​​：
✅ ​​Look at the arrangement of lamp beads​ ​: The genuine product is in a neat honeycomb shape, while the counterfeit product is like sprinkled with sesame seeds.
✅ ​​Look at the grayscale transition​ ​: When playing a gradient image, there are no color blocks on a high-quality screen.
✅ ​​Look at the specification code​ ​:Regular manufacturers will mark models like "NS-P4-2023" (P4 represents spacing)

Here’s a little trivia: The actual cost of P2.5 screens is now 60% lower than three years ago, but some merchants are still selling them at the old price. Don't get ripped off and help count the money!

4. Scenario comparison table

Note: An additional 20% budget is required for outdoor screens with IP65 protection. After all, they must withstand the sun and rain.

Editor's opinion: Now some manufacturers can make P3 screens look like P2.5. The secret is​ ​Low brightness and high gray technology​ ​. This kind of screen can still reach 16bit grayscale at a brightness of 800cd/m², saving 30% of power than ordinary screens. Remember to ask for a "Light Efficacy Test Report" next time you purchase, it is much more useful than staring at the P value!

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