Does the LED advertising screen at the entrance of your store always break down at critical moments? The hot pot restaurant downstairs opened last week, and the newly installed screen was playing a flashing red light that suddenly started to convulse, making the discount information look like a horror movie special effect. Today we will talk about this problem that gives bosses a headache - who should we call to adjust the LED screen flickering?

Don't rush to criticize the manufacturers. It's probably these places that are causing trouble.

Last month, I helped a friend deal with a screen flickering problem in a milk tea shop. The screen was fine during the day, but at night it flickered like a disco. Later I found out it was​ ​Voltage is unstable​ ​The trouble was caused - five air conditioners were turned on at the same time in this street at night, and the voltage dropped directly below 200V. The solution is very simple: spend 800 yuan to install a voltage regulator, which is much cheaper than replacing the screen.

There is also a gym owner who is even more unjust. The newly installed interactive floor tile screen keeps flashing green. Take it apart and take a look,​ ​Driver chips mixed in batches​ ​——Three batches of chips with different dates are crammed onto a board. This is just like mixing old and new batteries. Can the power output be kept stable? Later, the manufacturer solved the problem by replacing the driver board of the same batch overnight.

Three restricted areas for adjusting parameters yourself

1. ​​Don’t mess with the refresh rate​ ​: Although 1920Hz sounds high-end, if you adjust it to 2500Hz, the driver IC will burn out in minutes. There was an electrician in a shopping mall who didn't believe in evil and burned down an entire row of boxes. The repair fee was enough to buy half a new screen.
2. ​​Don’t turn up the brightness​ ​: The outdoor screen is indeed blindingly bright when adjusted to 7500cd/m², but the life of the lamp beads is directly discounted by 30%. The most sophisticated boss I have ever met. He adjusts the lamps for 5,000 in the summer and 4,000 in the winter. He hasn’t changed the lamp beads in three years.
3. ​​Be careful when adjusting color temperature​ ​: 6500K is standard white light. If you insist on adjusting it to 8000K to achieve cold white light, customers will look like they have entered the morgue. A certain clothing store did this, and its sales fell by 30% that month.

Five must-check points for finding a professional team for adjustment

1. ​​Look at the toolbox​ ​: A serious engineer would bring a spectrum analyzer, not a mobile app to fool people. Last time I met a master who used an industrial camera to take pictures of the screen and was able to measure the attenuation curve of each lamp bead.
2. ​​Ask about debugging plan​ ​: When I first said that I needed to change the driver, 80% of the time it was for two knives. Veterans will first test the power supply ripple, check the signal line anti-interference, check the cooling system, and finally touch the hardware.
3. ​​Check qualification documents​ ​: Not all ISO9001 are reliable, focus on annual inspection records. One manufacturer's certificate expired six months ago and was still being used. However, after adjusting the parameters, it flashed again three months later.
4. ​​Try automatic dimming​ ​: Now high-end screens can automatically compensate for brightness according to ambient light. If you shake it with a flashlight, a good screen should complete a 2000cd brightness jump within 5 seconds.
5. ​​Keep your promise​ ​: Don’t believe verbal guarantees. Write in black and white “free repair within three months if the problem persists after adjustment.” The most ruthless contract I have ever seen said, "If you fail, you will be compensated one thousand for one failure." The manufacturer's hands were shaking when he was making adjustments.

personal opinion time

After working in display engineering for so many years, I discovered a pattern:​ ​Manufacturers that dare to open up their production lines will have good calibration levels​ ​. Just like some manufacturers, customers can watch the parameter adjustment process via video connection at any time. Not everyone has this confidence. Especially for teams that have worked on overseas projects and have withstood the test of perverted standards such as Japan's JIS and South Korea's KC, adjusting the screen flickering problem is just a joke.

Finally, a little trivia: The current cutting-edge PWM dimming technology can increase the flicker frequency to more than 4000Hz, which is completely imperceptible to the human eye. This kind of black technology hidden in the chip is the real way to cure the root cause. Next time you encounter screen flickering, don't panic. Ask the manufacturer first: "Are you using analog dimming or digital dimming?" "The answer may save you tens of thousands of wasted money.

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