Alas, many friends have been asking recently, if you want to make a big screen that can be used to watch time and be used as a billboard, where should you buy it? It’s not difficult to say this, but the key is to find out the trick. Just like when buying a mobile phone, you can’t just look at the beautiful shell, it depends on the processor and screen quality, right? Let’s break it apart and chat today, and you will be sure to feel confident after listening to it!

​​Talk a real case first​
Last year, a shopping mall in East China installed a 15-meter-long LED clock screen, which displayed promotional information during the day and automatically switched to artistic animation at night. The most amazing thing is that the electricity bill saves 40% compared to traditional advertising screens - the secret is​Intelligent brightness adjustment system​​, under the sun, the brightness will be automatically increased by 5000cd/m², and the cloudy days will drop to 2000cd/m², and the soft light clock mode can be switched to in the middle of the night.

​​The three core indicators must be kept in mind​​

1. ​​Don't be fooled by refresh rate​: Some merchants on the market use 3840Hz as a selling point, but in fact there is a lot of moisture in it! If you use it indoors,​Effective refresh rate ≥1920Hz​It is enough to eliminate the ripple when shooting on your phone. This parameter is enough and saves money
2. ​​Brightness must be brainy​：
   • Select 4000-6000cd/m² for shopping mall lobby
   • 800-1200cd/m² is enough for office use
   • Don't believe the nonsense of "the brighter the better". Too bright will cause electricity to damage your eyes.
3. ​​The splicing accuracy is terrible​：
   Good screen splicing gap ≤0.5mm, poor screen splicing can be inserted into bank cards
   I have a cold knowledge: use a piece of A4 paper to plug it into the joints, and it is considered qualified if it cannot be inserted.

​​Five purchasing channels​

1. ​E-commerce platform price comparison​：
   Mainstream platforms now have engineering equipment areas, remember to focus on:

   • 72-hour aging test video
   • Waterproof and dustproof grade certificate
   • Warranty commitment of more than three years
     Last year's Double Eleven data showed that the platform's direct-operated stores were 12% cheaper than third-party stores on average, and they also received two additional warranty.

2. ​​Professional market Taobao​：
   Electronic markets such as Guangzhou Optics Valley and Shenzhen Huaqiangbei are very deep. I will teach you two tricks to prevent pitfalls:

   • Require on-site lighting test (at least half an hour)
   • Check if the driver IC is the latest model
     A boss complained to me that the screen he bought in the market had been used for half a year and the color difference was severe. When he opened it, he found that it was a stock chip from five years ago.

3. ​​Manufacturer direct purchase tips​​：
   Find it directly​Factory above 10,000 square meters​ manufacturers, such companies often:

   • Monthly production capacity exceeds 10,000 square meters (indicating that the technology is mature)
   • Can provide one-stop installation and debugging service
   • Those with high export proportion are more reliable (stricken international certification)
     Do you know? The screen exported to Japan is more than 6 more tests than the same model in China, and even the screws need to be tested for salt spray.

4. ​​Engineering Cooperation​：
   It is best to find local service providers for large projects, they can:

   • Help get the construction permit
   • Provide circuit modification solutions
   • Deal with after-sales issues quickly
     There is a gymnasium project in Hebei. I just found a company in another place and waited for half a month when I changed my control card.

5. ​​Second-hand equipment​：
   The equipment eliminated by leasing companies is extremely cost-effective, please pay attention to three points:

   • Check the cumulative usage time (don't touch if it exceeds 20,000 hours)
   • Detect the attenuation rate of lamp beads (the most intuitive test diagram with grayscale)
   • Requested to re-made waterproof seal
     There is a bar owner in Shanghai who spent 30% of the price to receive a pair of second-hand screens for performances. It has not been a problem for three years since use.

​​The cost account must be calculated like this​
Project data of a supermarket chain: 200㎡ clock screen total investment

• Hardware accounts for 45% (Lamp beads/power/box)
• Installation and debugging account for 25%
• Intelligent systems account for 20%
• Maintenance reserved 10%
  ​​Money-saving tricks​: Choose a beltEnergy consumption monitoring systemThe screen, three years of savings in electricity bills are enough to replace new modules!

​​These pits must be avoided​

• The basic thing about "lifetime warranty" is a scammer (the average warranty in the LED industry is 5 years)
• Don't consider splicing gap > 1mm
• If you can't find the official website information of the driver IC model, hurry up and run
• There is definitely a problem if you dare not provide 72-hour continuous playback test
• Those who do not write pixel out of control in the warranty agreement are all hooligans

​​Personal opinion time​
I want me to say, this industry is undergoing a major reshuffle. Now some manufacturers have started to play with "modular design". A single box can be replaced in 15 minutes, which is more convenient than changing a light bulb. There is even more amazing thing. Last month, I saw a clock screen with air quality detection, with a real-time display of temperature and humidity PM2.5 - this thing is placed in the mall lobby, which is both practical and can attract advertising sponsorship!

But we ordinary buyers just need to remember three iron laws:​The parameters should be serious, the cases should be verified, and the after-sales service should be written in black and white​​. Just like when buying a house, you have to look at the foundation, and when choosing a large screen, you have to look at whether the manufacturer has a fully automatic patch production line. It can be used for millions of dollars in one thing, and a small workshop can't afford it.

Finally, let’s know: The maintenance cost of professional-grade LED clocks is only one-third of that of ordinary screens. Why? Because the lamp beads use vacuum reflow soldering process, the shedding rate is less than 3% of ten thousand. So, there are reasons for being expensive, and the key is to calculate the long-term accounts!

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