Alas, are you guys scratching your head about this? I was going to buy a P4 display, but the product sent was P5 ； The promised outdoor waterproof screen will be filled in half a month after it is installed. Today we are like deciphering the password, and we will understand the tricks in this alphanumeric combination.

1. Letter trap in model

Last year, there was a guy who opened a shopping mall. The purchase contract clearly stated "NS-P4-OW", but the arrival was an indoor screen. What mystery is hidden in this mysterious string of codes?

​​Decrypt the basic formula​​：
Brand abbreviation (usually 2-3 letters) + pixel spacing (P followed by numbers) + feature code
To give a real case: a certain model with a "P" at the end number is a waterproof model, and a "F" with a flexible screen

​​Common letter traps​​：

• ​​P3≠P3.91​​(The difference of 0.91mm is 30% of the actual cost difference)
• ​​There are no numbers behind HDR​​(Probably pseudo HDR)
• ​​S, Pro, Max suffix​​(Maybe it just an appearance upgrade)

Key reminder:​​Don't be fooled by letter games​​, a certain engineer once understood the "R" in the rental screen model as waterproof, but the screen was directly blacked when the performance was raining heavily.

2. Hidden information of the digital part

The numbers behind the pixel spacing are getting more knowledgeable:

• ​​The number after P​​: Unit is millimeters, P4=4mm dot spacing
• ​​Numbers after slashes​​: For example, P4/25, 25 represents the module size 25 inches
• ​​Numbers connected by horizontal bars​​: P4-1920 refers to the maximum resolution of 1920x1080

​​Must-see parameter comparison table​​：

The most pitiful model marker that has ever seen: mark the module size as the display screen size, and the 10 square meter screen shrinks to 8 square meters in disguise.

Three or six must-check models

1. ​​Steel printing on the back of the module​​(Laser printing is difficult to forge)
2. ​​Inside label of power box​​(Attached production date batch)
3. ​​Control system interface​​(Look at the underlying information between the computer)
4. ​​Packaging box spray code​​(Compare logistics orders to prevent packet drops)
5. ​​Warranty card corresponding code​​(It is reliable to integrate three codes)
6. ​​The surface of the lamp beads is concealed​​(The brand logo can be seen in the microscope)

Key teaching:​​Use NFC function of mobile phone to scan module chip​​, authentic products will display production information, which helped customers see through a batch of refurbished screens last year.

4. Model and scene matching guide

​​Three steps for beginners to choose​​：

1. ​​Measure distance​​: Viewing distance (meters) × 0.3 = Suitable point spacing (mm)
2. ​​Depend on the environment​​：
   • Choose IP65 or above outdoors (not afraid of rinsing rain)
   • High-reflash screen for stage (≥3840Hz anti-photoriac)
3. ​​For functions​​：
   • The shopping mall atrium should be transparent (light transmittance > 80%)
   • High-bright screen for gymnasium (≥5000nit anti-sun)

Let me give you a negative textbook: A supermarket uses indoor screens as outdoor screens. After three months, the lamp beads are completely rusted, and the maintenance fee is enough to buy a new screen.

Editor's opinion time

After working hard in the industry for more than ten years, I look at the model and look at the ID card.——​​Just knowing that the number is useless, you have to be able to verify the truth​​. Three special reminders:

1. ​​Model with "X" may be a custom model​​(Compatibility needs to be confirmed)
2. ​​Different models of overseas version​​(Voltage parameters may not match)
3. ​​Replacement products with iteration number​​(For example, ProⅡ has more heat dissipation layers than Pro)

Finally, let’s talk about hardcore knowledge:​​Each lamp bead has its own code in regular manufacturers​​, which can be traced back to the production workshop and quality inspectors, is the authenticity and anti-counterfeiting! Remember to bring a magnifying glass for next inspection to ensure that the merchant dares not fool you.

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