Have you ever noticed the kind of advertising screen that can be viewed both positive and negative when shopping in the mall? It is obviously the same screen, why does it look bright in front of it and not gray from the side? Today we will talk about this question that makes novices crazy - where is the parameter setting of LED two-sided screen hidden?

▌The control panel is like a car dashboard
Let me tell you a real story: Last month, a shopping mall celebrated its anniversary, and the staff changed the brightness of the two-sided screens to a "symmetric mode". As a result, the front is bright enough during the day, but the back is overexposed, and the other way around at night. Later, the master taught me a trick——​ ​First look for the small black box behind the screen​ ​, that thing is much more reliable than a mobile app.

There are three types of mainstream control terminals:
→ Physical key panel (suitable for fixed installation)
→ Wireless trackpad (commonly used for temporary activities)
→ Cloud management system (favorite with large chain stores)
For example, the screens that automatically switch advertisements in subway stations are basically controlled by the backend cloud, and no one needs to adjust the parameters on site at all.

▌Where are the five core parameters hidden?
The most common mistake that novices make is to adjust the brightness quickly. Remember this priority:
​​① Brightness balance (the difference between the front and back sides is ≤15%)​​
​​② Color synchronization rate (ΔE value <3)​​
​​③ Refresh rate matching (at least 1920Hz)​​
​​④ Visible angle compensation (178° each left and right)​​
​​⑤ Heat dissipation threshold setting (usually automatic frequency reduction of 55℃)​​

I visited a show last week and saw engineers running around the screen with a colorimeter. After asking, I realized that they are using the "three-point positioning method":​ ​Front center point, side 30° position, back center point​ ​The data is measured once each time, and the intermediate value is taken as the reference. This method may not be used for household use, but commercial places are particularly important.

▌Ranking of common tricks

1. Take a photo with your mobile phone and adjust the color (the color temperature accuracy error can reach 3000K)
2. Turn on the energy-saving mode to hold activities (suddenly lowering the brightness is scary)
3. Ignore the ambient light sensor (the same as day and night)
4. Forgot to set the timing task (it will light up when the screen is black)
5. Backup parameters and save the USB drive (it will be done if it encounters electromagnetic interference)

There is a shopping mall that uses two-sided screens as single-sided screens, and the back has a long-term fixed screen, and the screen burning phenomenon occurs in half a year. Now all the industry recommends opening​ ​Pixel displacement function​ ​, even if static content is displayed, the position will be fine-tuned. This switch is generally hidden in "Advanced Settings - Screen Saver Maintenance".

▌Hidden function reveals
Do you think both screens can only display the same content? Too naive! Now high-end models support:
→ Front and reverse display (data on the back of the front advertisement)
→ Time-sharing multiplexing (double-sided display during the day, single-sided power saving at night)
→ Smart mask (switch the main screen according to the direction of the flow of people)
Last year, a concert used this black technology, which was broadcast live on the front and updated the lyrics in real time on the back. This gameplay is indeed 6.

The editor finally said a few words: Don’t be greedy for adjusting parameters, remember the golden rule of “brightness first, then color, static first, then dynamic”. If you really can't handle it, remember to find a manufacturer.​ ​Preset scene mode​ ​, the one-click switching between shopping mall mode, exhibition mode and outdoor mode is much better than just your own blind adjustment. By the way, I recently discovered a weird operation - using a thermos cup to fill hot water close to the heat dissipation hole, and judging the heat dissipation efficiency by the condensation speed of the water vapor on the wall of the cup. This method is actually more sensitive than a thermometer. Do you think it is magical?

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