​​Hey? Aren’t dot-matrix screens just electronic building blocks that can glow?​​
Two days ago, Lao Wang, who runs a milk tea shop, asked me: "I want to install a light card that can change characters at the cashier. Who should I find to make this thing?" Look, even the old world who has been working in catering for ten years is confused. Today we will break it and talk about where to customize this kind of glowing "electronic building blocks".

​​Why do you have to find professional people for professional matters?​​
You may think that you can do whatever you want to find a hardware store to weld a few rows of light bulbs. But we have to understand,​Dotted screen is not a marquee​, there are so many more things to pay attention to:

• ​​Brightness pit​: It looks bright during the day, but it can be blinded at night - smart dimming technology
• ​Lifespan thunder​: It will take a dark spot after half a year of use - it depends on the heat dissipation structure and driving plan
• ​Maintenance​: If you change the light bulb, you have to remove the entire board - modular design is the best

For example, last year, a chain of convenience stores found a menu screen that was made by a small workshop for cheap photos. As a result, the rainy season collectively "grown pockmarks" and lost more than 200,000 yuan in after-sales disputes alone. So,The value of a professional manufacturer lies in turning accidents into expectations​。

​​How to choose core parameters so as not to pay IQ tax?​​
Remembering this "three-looking formula" is enough:

1. ​​Look at pixel density​

   • Cashier display: P10 (10mm spacing) is enough and saves money
   • Shopping mall exterior wall: Starting from P6, you can see clearly from 30 meters away
   • Stage background: Only after P3 or below will it feel delicate

2. ​​View refresh rate​
   Don't believe in the nonsense of "the human eye cannot tell",1920Hz is the bottom line​! Only when you take a mobile phone without ripple screen is considered qualified, and you can't save this little money.

3. ​​View the protection level​
   A tip: use your finger to gesture the numbers behind the IP. For example, IP65, the first number 6 represents dust protection level (up to 6 levels), and the second 5 represents waterproof level (up to 8 levels). The milk tea shop operating table must have at least IP54, and the outdoor advertising screen does not have IP65, so wait to cry.

​​Scene selection is like wearing glasses​
Here is a universal formula:​Space distance (meters) × 30 = Optimum pixel spacing (mm)​

• Cashier (1 meter distance): 1×30=30mm→Select P3
• Restaurant menu (3 meters): 3×30=90mm→P9 is enough
• Shopping mall large screen (10 meters): 10×30=300mm→P30 is fine

But be careful,​View arc-shaped field with angles greater than 120°​​, you have to use a specially arranged soft screen, and ordinary hard screens will deform like haha ​​mirrors.

​​How to find a reliable manufacturer?​​
Teach you three tricks of "Sign up the Demon Mirror":

1. ​Workshop exploration​: You dare to see that the production line is 80% worthwhile, and focus on whether there is an aging test area
2. ​Case tracking​: Don’t just look at the promotional pictures, you need to take real projects in the past six months
3. ​After-sales interrogation​: Ask the night response time limit, and the real boss is the one who dares to promise to be there for 2 hours

A friend who opened a gym suffered a loss. He found a manufacturer without after-sales orders for cheapness. As a result, the screen was half dark in the summer. After waiting for three days, the member almost made a refund.

​​Hidden knowledge points for installation and maintenance​
Don't think that everything will be fine if you install it. If you don't pay attention to these details, you will regret it:

• ​Power cord diameter​: For every 5 meters of wire length, the wire diameter must be thickened by 0.5mm²
• ​​Heat dissipation spacing​: The gap left behind cannot be less than 1.5 times the thickness of the screen
• ​​Software Adaptation​: Ask clearly whether the payment supports the cash register system you use, don’t make any data garbled

There is a hot pot restaurant owner who is trapped here. The screen that can be installed at a high price cannot be connected to the Meituan system, and in the end it can only be used as an electronic poster. Are you wronged?

Now you should understand that choosing an LED dot matrix screen is like finding a partner.​Just looking at your appearance is not good, you still have to find out the details​. Next time someone asks "Where can be done in this screen?", you will turn it over to four criteria:

1. Is there an automated production line?
2. Do you dare to provide a three-year warranty?
3. Can it be certified internationally?
4. Should I accept emergency orders?

Manufacturers that meet these quotations will not be wrong if they choose with their eyes closed. Remember,​Good screen saves——Save worry, save trouble, save trouble, this is really cost-effective!

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