Hey, have you ever been surprised by those curved advertising screens when you went to the mall? It feels like a bent mobile phone screen that can completely envelop you when playing a movie. Nowadays, even wedding companies have begun to use curved screens to create atmosphere, but when a novice buys this thing, he or she will most likely be confused by the parameter list - what about the radius of curvature, cabinet radian, and pixel compensation, it sounds like a book from heaven. Today we are going to talk a little more down to earth and teach you how to avoid the pitfalls of buying a curved screen.

1. Curved screens don’t just bend and end.

Last year, a bar owner complained to me that the curved screen he spent a lot of money on always deformed when playing videos, making faces look like a distorted mirror. ​ ​There are actually three doorways here​​：

1. ​​Radians are calculated using trigonometric functions​ ​: For example, if you want to make a circular screen with a radius of 5 meters, the arc length of each box must be accurate to the millimeter level, otherwise there will be black lines at the splicing joints.
2. ​​Resolution needs to be increased​ ​: Under the same area, a curved screen consumes 15%-20% more pixels than a straight screen to ensure that the curved screen does not deform.
3. ​​Play tricks to dissipate heat​ ​: Because the bending structure affects air circulation, a cross-duct design must be used. The brightness attenuation cannot exceed 3% at a high temperature of 55°C.

2. Five things that must be done for on-site inspection

Last month, I accompanied a friend to inspect the goods. The supplier took the remote control and clicked it, and the images displayed were deceptive pictures of blue sky and white clouds. ​ ​All those who really know the business have experienced this​​：

• ​​Put Excel table​ ​: Display horizontal and vertical lines in full screen. Stand 3 meters away to see if there are any faults or distortions in the lines.
• ​​Play high-speed motion video​ ​: Select a racing scene and pass directly if the car taillight smear exceeds 2 cm
• ​​Turn off the lights to see the uniformity​ ​: When displaying a solid color screen, if the brightness difference between the four corners and the center exceeds 10%, it is a defective product.
• ​​Touch temperature​ ​: After 2 hours of booting, if the screen surface temperature exceeds 45°C, the heat dissipation will definitely not be adequate.
• ​​Measure seams​ ​: Take a piece of A4 paper and plug it into the seam of the box. If it can be inserted more than 3mm, it will be considered unqualified.

3. Hidden costs in installation

Many people think that buying a screen is the end of it, but it turns out that the installation fee is more expensive than the screen for many people. ​ ​Ask these fees in advance​​：

1. Is there any extra charge for the curved steel structure skeleton? (Normally should be included in the quotation)
2. Curved screens over 8 meters require a crane. Who will pay for this?
3. How to calculate the rental fee for a professional-grade calibrator for debugging?
4. The most annoying thing is the software adaptation fee - some suppliers will charge a service fee for video source deformation correction, which should obviously be included in the basic service!

4. The life and death line of after-sales service

I know a buddy who does exhibitions. After half a year, color patches appeared on the screen. As a result, the manufacturer said that man-made damage would require repairs at his own expense. ​ ​When signing a contract, it must be written in black and white​​：

• Free door-to-door maintenance within three years, response time no more than 24 hours
• Provide emergency replacement service for spare boxes
• Lifetime free upgrade of software system
• Free door-to-door dust removal maintenance twice a year (many broken screens are actually caused by dust accumulation causing short circuits)

I was chatting with an old master once, and he told me a trick for choosing a curved screen: let the supplier play the wormhole passage clip of "Interstellar" live. If the stars around the black hole are severely smeared, or the edges of the spacecraft are jagged, there is definitely something wrong with the screen. In fact, buying a curved screen is like looking for a partner. It doesn’t matter if it looks good, the key is that it can withstand closer inspection. Next time you go to talk, remember to bring a USB flash drive with the test video. It is most reliable to inspect the goods on the spot.

Nowadays, some manufacturers sell high prices under the banner of "flexible screens". In fact, they just add an adjustable-angle bracket behind the straight screen, which is not a true curved module at all. For a truly good curved screen, each box is specially made, and everything from the PCB circuit board to the lamp bead arrangement is specially designed for the curvature. Don't believe those who say it can be bent on the spot. That kind of screen will definitely cause problems after three months. Remember, the arc is a hard indicator to be written in the factory inspection report, it is not something the installer can wrench out on site with a wrench!

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