Hey, have you ever encountered this situation? During the meeting, the projector suddenly suffered from serious color aberration, the data on the PPT was completely blocked by the black border of the splicing screen, and the screen became mosaic during the video conference... I guess everyone here has experienced these unpleasant things. Especially for our local enterprises in Lufeng, finding a reliable large screen for conference rooms is even more difficult than finding a partner—it must be decent-looking (good picture quality), good at living (power-saving and durable), and good-tempered (easy to operate). Today we will talk about how to find a satisfactory large LED screen in Lufeng.

1. Three numbers determine the outcome: a must-read parameter guide for beginners

​​Let’s talk about some trivia first​ ​: A report last year showed that 63% of companies bought the wrong large screen because they did not understand these three numbers - dot pitch, brightness, and refresh rate. Let’s break it down:

​​1. The metaphysics of point spacing​​

• For small conference rooms with less than 20 people, choose P1.8-P2.5, which is equivalent to the clarity of watching videos with a mobile phone held against your face.
• P2.5-P3.0 is used in conference rooms with 30-50 people. From this distance, you can see an Excel table as clearly as you can see an A4 paper.
• Lecture halls with more than 50 people can directly use P3.0+, and 4K promotional videos can be watched from 8 meters away without blurring.

​​2. The doorway to brightness​​
Don’t believe those merchants who brag about 8,000 lumens! The conference room is not a place for square dancing. The actual measured data speaks:

• Natural light conference room: 800-1200cd/m² is sufficient (equivalent to outdoor brightness on a cloudy day)
• Fully blackout conference room: 300-500cd/m², more eye-friendly (20% darker than mobile phone screen)

​​3. Trouble with the refresh rate​​
Never touch a screen below 1920Hz! People's faces turn green during video conferences, and there are shadows when flipping through PPTs. This is all because of this thing. There is a simple test method: use your mobile phone to take a slow-motion shot of the screen and return it if you can see the scan line.

2. Four steps for installation and acceptance: Master’s tips for preventing pitfalls

A while ago, I checked a screen for a friend and found that the merchant marked the parameters of the engineering machine as a commercial machine for sale. Here are some hard-core operations for on-site inspection:

​​① Grayscale test​​
Ask the merchant to post a 256-level grayscale image. If the naked eye can count 20 color levels, it is considered qualified. If you see the boundaries between color blocks, there must be something wrong with the color transition of this screen.

​​② Signal stress test​​
Connect 4 computers + 2 video conferencing cameras at the same time to see if the picture will freeze. A serious commercial screen should automatically switch signal sources within 0.3 seconds.

​​③ Black screen light leak detection​​
Turn off the lights to see a pure black screen, and put an A4 piece of paper on the screen. If you can see the reflection of the paper, it means that the black purity is not up to standard, and the meeting at night will look like a layer of fog.

​​④ Touch delay test​​
Use a stylus to write connected characters. If the strokes cannot keep up with your hand, it is considered a defective product. Nowadays, high-end screens can achieve 2ms delay, which is basically synchronized with writing on paper.

3. Three ways to save money on purchasing: Tips for spending a little money to do big things

Many people may ask: The price difference between the local suppliers in Lufeng is so huge, how deep is the water here? Let me give you a practical example:

​​Case comparison table​​

Do you see the way through? If you choose a mid-range screen, you can save money on a projector in five years. Let’s talk about an industry insider: Many merchants sell refurbished project materials as new screens. Let me teach you how to identify them - check whether there are any plugging and unplugging marks on the power interface. The interface coating of the new machine should be matte.

4. After-sales maintenance life and death line: five life-saving clauses that must be signed

Last year, a local company suffered a big loss. After only two years of use, a large area of ​​the screen was dead. The manufacturer actually said it was over-warranted. Here are the key points:

1. ​​Brightness attenuation clause​ ​: It must be stated that the brightness shall not be less than 85% within three years.
2. ​​Spare parts warehouse distance​ ​: Spare parts worth RMB 300,000 must be in stock within 50 kilometers.
3. ​​Response time​ ​: From the time of repair report to the engineer’s visit, no more than 72 hours
4. ​​Software upgrade​ ​: Includes system upgrade services for at least five years
5. ​​trade-in​ ​: The deduction ratio for old screen recycling shall not be less than 15%

There is a trick: ask the supplier to provide acceptance reports from three customers in the same city and compare the actual usage parameters. If you don't even dare to give a case, you probably have something wrong with you.

5. Private words of industry veterans

I recently had a drink with some friends who are engaged in display technology, and they revealed a trend: LED screens are now becoming the central nervous system of conference rooms. For example, some high-end models can already do this——

• Automatically recognize the number of people during a meeting and adjust the brightness
• Remote collaboration and annotating files directly on the big screen
• Meeting minutes are automatically generated with timeline markers

So, now you have to be careful when choosing a screen. Even if you cannot use these functions temporarily, you should choose a model with an expansion interface. Maybe one day the boss will carry out a smart upgrade, and then replacing the screen will cost hundreds of thousands.

​​Editor's opinion​​
In fact, choosing a large LED screen is like looking for a partner. Suitability is more important than expensiveness. I have seen too many companies follow the trend and buy the most expensive one, only to use less than 30% of the functions. Remember three principles: select parameters according to needs, inspect hard goods on site, and guarantee after-sales contracts. The next time you encounter a salesperson who is boasting about it, slap this article on his face - what we Lufeng people pay attention to when buying things is having a good reputation!

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