Have you ever noticed that the scrolling screens in supermarkets always attract your attention at critical moments? For example, fresh food discount information suddenly turns red, or member points prompts pop up just right. These simple text scrolling are hidden behind the question - choosing the wrong device may make you spend more money, and even the embarrassment of not being able to see words clearly in broad daylight. As an experienced driver who has been working in the display industry for ten years, today we will take you through the purchasing path.

​​1. Five golden rules for purchasing​​
Last month, I helped my friends check the procurement, compared more than 20 suppliers, and summarized these hard-core experiences:

1. ​​Brightness must be good at magic​​
   The supermarket lights vary greatly from morning to night. In the morning, the brightness of 4000cd/m² is required to fight against the sun. At night, it must automatically drop to 800cd/m² to not be dazzling. A manufacturer demonstrated a unique skill to us - use the flash of the mobile phone to directly shoot the screen, and the brightness will automatically increase by 30% within three seconds. This kind of intelligent adjustment is the real skill.

2. ​​Waterproof and touchproof are a necessity​​
   The fog in the fresh food area and the slap of naughty children are all invisible killers. Actual measurements have found that IP54-level equipment with a 1mm drainage tank with a frame has a lifespan of 3 times longer than ordinary equipment. A ruthless man poured a bottle of mineral water on the surface of the equipment, but the screen was still scrolling the promotional information normally.

3. ​​You have to know how to dance in the font​​
   Don't underestimate the text scrolling effect. A good device can do:

• The characters in Kaiyi are not blurred
• Red special offer information is automatically highlighted
• Digital jump belt slow in and out effect
  Last time I saw Tai Shen Ji, I could actually adjust the rolling speed according to the customer's walking speed. This experience is amazing.

​​2. Procurement channel red and black list​​
There are three main ways to buy on the market. I made a comparison table:

Let’s talk about the pitfalls of second-hand equipment: Last week, I saw the "90% new" equipment priced at 2,000 in Taiwan. I opened it and found that the power module was replaced with a copycat, and the control card was still an old antique from ten years ago. Remember this formula - "Three Don't Buy":

• Don't buy the serial number if it is blurred
• Don't buy if there is rust on the interface
• Don't buy if there is thin wire when the screen is bright

​​3. Price password cracking technique​​
Why do some screens of the same size sell for 8,000 yuan and some dare to ask for 30,000 yuan? The secrets are all in these details:

1. ​​Pixel trick​​
   P10 and P6 look similar, with a real cost difference of twice:

• P10 (10mm pitch) is suitable for 10 meters of appearance, 4,000 yuan per square meter
• P6 (6mm) is suitable for within 5 meters, and it costs 9000 per square meter+
  A supermarket owner bought a P10 with a cheap photo, but when customers approached the promotional price, they were filled with mosaics.

1. ​​Box material mystery​​
   The aluminum-magnesium alloy box is 30% more expensive than the iron sheet, but it has good heat dissipation and light weight. I will teach you a trick to detect - tap your finger joints and the sound is as crisp as a bell.

2. ​​Invisible service fee​​
   Don't be fooled by the bare metal price. These fees must be asked:

• Does the mounting bracket contain shock-proof design?
• Is software license buyout or annual fee
• Do I need to charge additional fees for system upgrades?
  Some suppliers quoted 20% lower than others, but as a result, they charged a "data service fee" of 3,000 yuan per year, which became the most expensive in three years.

​​4. Installation location life and death situation​​
For the same device, the effect of installing the wrong place is discounted:

​​Above the milk freezer​ ​: Choose a low-temperature resistant screen. Ordinary equipment will drag shadows below 5℃
​​Behind the cash register​ ​: The viewing angle must be >160°, otherwise the side customers will not be able to see clearly
​​Fresh food entrance​ ​: You have to use an anti-fog coating, otherwise the water vapor paste screen will be in minutes

There is a classic case: a supermarket installed a screen at the central air conditioner outlet, but in summer, the condensate water directly poured into the equipment and a short circuit took three days. Now they are learning to be smart, and they use smoke to test the direction of the airflow before installing the screen.

​​5. Know the future trends early​​
Recently, some black technology has emerged in the industry, which may change the rules of the game:

• ​​AI recommendation engine​ ​: Identify the characteristics of the population based on the camera and automatically push the information of maternal and infant/elderly products
• ​​Gesture interactive screen​ ​: Customers can check inventory with a wave of their hand, which is three times faster than finding a clerk
• ​​Photovoltaic power supply system​ ​: Use the supermarket ceiling sunlight to generate electricity independently, saving 80% of the electricity bill

However, these new technologies are still in the early stages of trying out, and ordinary supermarkets recommend waiting and watching for half a year before buying.

Editor's opinion: Buying a scrolling screen is like finding a partner. You can't just look at the appearance but not the appearance, you have to look at the "inner beauty". Those who dare to show you an aging test report and provide a three-year warranty for the whole machine are really reliable. Next time I saw a supplier boasting about "imported chips", remember to let him disassemble the machine and inspect the goods on site - it was a mule or a horse, and I only found out after I took it out for a walk.

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