Do you often see the red and yellow LED screens in the mall, which clearly show "50% off the entire venue", but the words are as muffled like soy milk overnight? Last week, my cousin suffered this loss when she opened a supermarket - she bought a two-color screen for 8,000 yuan. It reflects during the day and is dazzling at night, so she is so angry that she stomps her feet. Let’s talk about how to choose this LED dual-color screen so as not to pay the IQ tax?

1. Find out what you want it to do first

Buying a two-color screen is like buying groceries, it depends on the purpose of the dish. You can't use plastic bags of green onions to fill live fish, right?

• ​Supermarket promotions​: The red and yellow colors are the most eye-catching, but you have to pay attention to whether the font is thick enough
• ​Bus stop sign​: The combination of red and green is clearer, especially in rain and fog weather
• ​Warehouse logo​: Single red is enough, don't mess with those fancy ones

The owner of a convenience store complained to me that the two-color screen he bought was lit up like a searchlight at night, and customers said it seemed like they had entered the interrogation room. So,​The scene is better than anything else​。

2. The paths in the parameter table

Don't be fooled by salesmen! Remember these three key indicators:

1. ​​Glowing color​​：

   • Authentic two-color screen can display 3 states (red/green/yellow)
   • When the inferior products are mixed with colors, they will turn into dirty coffee

2. ​​Visible distance​：

   • The spacing between each lamp bead (P value) determines the clarity
   • If you see it outside 10 meters, you must choose P10, and if you see it within 5 meters, you must choose P6.

3. ​​Brightness adjustment​：

   • Do not indoors exceed 800cd/m² (refer to mobile phone screen brightness)
   • Open air below 3500cd/m²? It's like it's not powered on in the sunny day

Last year, a P20 dual-color screen installed in a logistics warehouse had to walk within 3 meters before the shelf number could be seen clearly. This is not a waste of time!

3. Five tips for finding manufacturers

1. ​​Looking at the workshop is more realistic than looking at the samples​​：
   For truly powerful manufacturers, the production lines are all automated assembly lines. I have seen some small workshops where workers are still using soldering irons to hand-weld light boards. This kind of screen will definitely cause problems if it is used for half a year.

2. ​​Don’t be sure to be certified​：
   CCC certification is the bottom line, and CE certificates must be based on the latest annual inspection seal. I met a merchant with a 2016 certificate to charge the number, but the product could not pass the electromagnetic compatibility test at all.

3. ​​The test machine must look at the three states​：
   Let the manufacturer demonstrate the three states of pure red, pure green and mixed color on the spot. The most outrageous screen I have ever seen, it will be black when it is cut to the color mixing mode.

4. ​​Light bead supplier​：
   For regular manufacturers, the lamp beads of a certain Taiwanese brand are three times more expensive than miscellaneous brands, but their lifespan can be five years longer.

5. ​Don't be greedy for the general account​：
   Pay the three-year electricity bill and maintenance bill into the cost. If you have a screen, it looks like two thousand cheaper, but it will cost you more electricity every year and buy half of the screen.

4. Hidden skills for installation and maintenance

Do you think it's done if you buy it? These three things may not be done well and all previous efforts are wasted:

• ​Anti-reflective coating​: Don’t save this money! The screen installed in a fresh food store is as reflective as a mirror, and customers can't see the special offer information clearly.
• ​​Heat dissipation design​​: Metal shells are more expensive than plastic shells, but worth it. The worst screen I have ever seen faded into pink after using them for two years.
• ​Remote control​: 30% more expensive with 4G modules, but you don’t need to climb ladders to modify content, which is particularly practical for chain stores

5. After-sales service mirror

Good manufacturers dare to promise this:

• ​24-hour response​: You can also call to restart if you cut off power in the middle of the night
• ​​Five-year warranty​: The lamp bead attenuation exceeds 20% for free
• ​Door-to-door training​: The cleaning aunties in the church will change the content

Compared with the "three-year warranty" mentioned by some merchants, the price of a control card is 800 yuan and the shipping fee is also required. This is the real gold and is not afraid of fire.

After all, buying an LED dual-color screen is like finding a partner - it is not good enough to dress up, it must withstand the food and food. If you are unsure of your mind next time, remember this old saying: I would rather ask three more factories than believe in sales. By the way, I heard that some manufacturers now support AR preview installation effects, which is not much better than thinking about drawings?

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