Are you a novice purchaser who is new to the industry and gets confused just by looking at the parameter table? Last month, my cousin opened a store to buy LED screens. The salesperson described P3.91 as "quasi-4K effect", but after installing it, the faces were all mosaic.…​ ​Today we will peel off the parameter table and teach you three tricks to see through the merchants’ routines! ​ ​

The first level: the tricky issue of brightness and refresh rate

​​"The salesperson said 4500 nits is enough, is this true? "​ ​Remember these two life and death lines:

• ​​Indoor screen​ ​: 800-1200 nits is the golden range (equivalent to 5 mobile phones turning on the highest brightness at the same time)
• ​​outdoor screen​ ​: If the nits are less than 4000 nits, pass directly (it will reflect like a mirror under the noon sun)

​​The refresh rate is even worse​​：

• ＜1920Hz: When shooting video, the image will be blurred (Have you ever seen the leader of the annual meeting waving his hand and turning into the Thousand-Armed Guanyin? )
• ≥3840Hz: Suitable for live streaming (lipstick color testing without color bleed)

​​real case​ ​: A certain gym chain was deceived into buying a gym with a low refresh rate. During the live group class, members’ movements were all blurred into shadows, and the conversion rate was cut in half!

Level 2: Word Game in Protection Level

​​"Is IP65 protection standard? "​ ​The water is very deep here:

• True IP65: Use a high-pressure water gun to spray directly for half an hour without water entering (pay attention to the sealing strip during the test)
• Fake IP65: Use the shower head for two minutes and then stop cooking (this kind of screen will be short-circuited during the rainy season in the south)

​​Focus on heat dissipation design​​：

• Aluminum casing dissipates heat 3 times faster than plastic casing (if the casing becomes hot when touched, return it immediately)
• Screens with smart temperature control chips last 2 years longer (real-time temperature curves can be viewed in the background)

​​Tell us a little bit about the industry​ ​: Some merchants sell repaired and refurbished screens as new products. Let me teach you a trick to inspect the goods - after turning on the phone, use a flashlight to shine on the seams. If there are traces of repairs, you can see the reflection of the glue!

Level 3: The relationship between pixel spacing and resolution

​​"How big is the difference between P2.5 and P3? "​ ​This comparison chart can save lives:

​​Lessons of blood and tears​ ​: I have seen the owner of a hot pot restaurant install a P1.25 screen in a 10-square-meter private room. The guests sitting two meters away looked at the grainy screen and thought they had astigmatism!

Hidden Parameters Sales Will Never Tell You

​​"What’s the use of a three-year warranty? "​ ​These parameters are the real core:

1. The gray level must be ≥16bit (otherwise the gradient sky will be layered)
2. Color gamut coverage > 90% NTSC (can you blame the screen if the lipstick color test is not accurate? )
3. Brightness uniformity <5% (don’t let the screen become a yin and yang face)

​​The truth that defies common sense​ ​: High refresh rate ≠ high image quality! A music festival used a screen with a 7680Hz refresh rate, but the color gamut was only 85% NTSC. The singer's face turned blue under the live lights, and fans scolded her for trending.…

The editor’s experience after eight years of cheating

I’ve seen too many parameter traps, so let’s talk about it from the bottom of my heart:

1. ​​Don’t be superstitious about 4K​ ​: If the viewing distance is more than 5 meters, P2.5 and P3 cannot be distinguished by the naked eye.
2. ​​Be wary of "custom parameters""​ ​: The later maintenance fee for non-standard products can buy half a new screen
3. ​​Fuck the warranty terms​ ​: It must be stated that the lamp beads, power supply, and control system are fully insured.

Recently I discovered a trick - take the video of "Game of Thrones" setting fire to King's Landing to test the screen, which can test the brightness, contrast and dynamic performance at the same time. Last year, a shopping mall used this method to try out color gaps on three screens, cutting off 15% of the budget!

Remember, the parameter table is not a college entrance examination paper, so there is no need to understand it all. By grasping the three key points of brightness, refresh rate, and protection level, you can avoid at least 80% of pitfalls. The next time you encounter a salesperson bragging about parameters you don’t understand, just tell him directly: "Can you show me the actual demonstration video?" "Make sure he reveals his true colors!

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