Alas, have you ever seen a three-story scrolling screen when you watch short videos? It’s the big guy at the entrance of the mall who changes patterns according to the rhythm of the music. My cousin opened a shopping mall last year and bought a second-hand scrolling screen for cheap. But it stopped moving on the opening day and turned into a giant blackboard... Today, let's talk about what to pay attention to when buying such a big guy, so you can avoid detours for three years after watching it!

What parameters should you look at when buying a large scrolling screen

This thing is not as big as it is, the key is to look at it​ ​Three sets of hard core data​​：

1. ​​Whether to carry brightness or not​ ​: The brightness of outdoor use is at least 4000cd/m², and the image can be clearly visible when the sun is shining at noon. If the screen is gray like a layer of fog, pass it quickly
2. ​​Don't do any work in the refresh rate​ ​: 1920Hz is the bottom line. If it is low, the videos taken are all ripple, and it is embarrassing to post on Moments
3. ​​Waterproof and stupid design​ ​: IP65 protection is the starting price. If the screen smokes on rainy days, the repair fee will be enough to buy half a set of new equipment.

To give a real example: the main stage of a music festival uses a scrolling screen that does not meet the standards. On a rainy day, the lower half of the screen is directly black, and the singer almost jumps on the tilted screen.…

Hidden costs of installation and maintenance

Do you think it's over if you buy the screen? ​ ​Installation plan​ ​The money-burning bigwig:

• Steel structure brackets need to pay 300-500 yuan more per square meter, but they are 10 times safer than using scaffolding.
• The embedded parts must be laid 1.5 meters deep foundation, and when they encounter soft soil layer, they must be filled with cement slurry to reinforce them.
• The circuit must be made of flame retardant wire pipes, and ordinary PVC pipes will be used for three years and quasi-aging.

I saw a ruthless man operating last year - in order to save installation costs, a shopping mall hangs a 20-meter-long scrolling screen directly on the glass curtain wall. As a result, on the third day of opening, three fixing screws were loosened by the wind, and the screen is still open with its neck tilted!

Scroll screen selection and avoid pit comparison table

I'm secretly telling the inside story of the industry: many screens that claim to be "military industry quality" have not even been tested for salt spray. If this kind of product is used in the beach project, the control board will be corroded into slag by the sea breeze in half a year!

How to judge whether the supplier is reliable

Teach you three unique skills in inspection:

1. ​​Handle vernier caliper​ ​Measure the thickness of the box, if the aluminum alloy of 3mm shrinks to 2.5mm, just lift the table and leave.
2. ​​Start the machine and play for 8 hours​ ​Test to see if there is any local hot or color block drift
3. ​​Requires three-year maintenance record​ ​, the real master is the one who dares to provide real maintenance data

A customer was smart last year - asked the supplier to soak the screen in the pool to shoot videos, but three companies exposed the filling and bubbled on the spot. This screening efficiency is much faster than checking the certificate!

Now I know why the price of the same size of scrolling screen can range from 100,000 to 1 million, right? Real good products contain patented technology from lamp bead arrangement to cooling air ducts. Remember to bring a torque wrench to the site for next purchase. If the installer fails to screw the screws to 25N·m, the project will be completed sooner or later!

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