Friends who have just joined the industry may have encountered this dilemma - the LED screen at the event was as bright as a searchlight, blinding the guests, and they were hurriedly looking for the remote control to adjust the brightness. As a result, the screen suddenly became gray and foggy. Last year, I helped a wedding company adjust the stage screen, and the groom’s face was turned into a blue-grey color. This terrible thing made me understand:​ ​Adjusting the brightness is not as simple as pressing a button​​。

​​The really useful brightness adjustment switches are hidden in these three places​​

1. ​​PWM dimming circuit on driver chip​ ​(Equivalent to the "pacemaker" of the screen)
2. ​​Grayscale correction software​ ​(Stop using the brightness slider that comes with Windows)
3. ​​ambient light sensor​ ​("Automatic" mode only available on advanced screens)

Last week I visited the laboratory of a certain company. Engineers were using spectrometers to debug new products. They have a unique skill:​ ​Reduce the brightness from 4000cd/m² to 800cd/m² without losing the picture level.​ ​. The secret lies in the dimming chip hidden on the back of the circuit board. This thing is like the "central nervous system" of the screen. Many low-end screens on the market do not have this configuration at all.

​​Three fatal mistakes novices must make​​
The most outrageous operation I have ever seen:

• Adjust the brightness of the outdoor screen to 2000cd/m² in broad daylight (wait for half a year to replace the lamp beads)
• Use projector calibration method to adjust LED brightness (not the same thing at all)
• Thinking that smart adjustment is the automatic mode that can take over the world (it can make you cry on rainy days)

Let’s take a real case: The screen in the atrium of a shopping mall was always overexposed. Later, it was discovered that the cleaning lady touched the light sensor when she wiped the screen every day. Nowadays, high-end screens have them​ ​Triple brightness lock​ ​: Hardware lock + software password + physical shield, this is the professional approach.

​​Hidden parameters behind brightness​​
▪ A screen with a refresh rate ≥1920Hz can achieve flicker-free dimming.
▪ The indoor screen exceeds 1200cd/m² (equivalent to 1/10 of noon sunlight)
▪ The grayscale must start at 16bit (otherwise, adjusting the brightness will lose details)

Recently I saw a piece of black technology——​ ​AI environment adaptive system​ ​. Once in an exhibition hall converted from shipping containers, the screen was able to automatically adjust according to the amount of light transmitted through the skylight, and the picture was always clear from morning to night. This technology needs to be used in conjunction with weather station data. I heard that the R&D team debugged more than 300 lighting scenes before it was completed.

The editor finally tells the truth: before adjusting the brightness next time, first find out the "temper" of the screen. Bring a illuminance meter to measure the ambient light and open the grayscale test chart.​ ​Start fine-tuning from 50% brightness​ ​. Remember, the brightness adjustment of a good screen should be like the exposure knob of a high-end camera - delicate, precise and with feedback. For those screens where pressing the plus and minus keys is like turning on a light switch, it is recommended to pass directly!

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