Wang Gong, who has just taken over the renovation of the shopping mall atrium, has been in trouble recently - the newly equipped P3 high-definition large screen has a horizontal viewing angle of more than 160°, but when you stand on the second floor, you always feel the picture is white. It's like a novice photographer doesn't understand white balance adjustment, and no matter how advanced the equipment parameters are, they cannot produce good results. Today, let’s talk about the mystery of horizontal setting of LED large screens.

​​The installation location determines the line of life and death​
When debugging the fence screen at a stadium in Tokyo, the engineer aimed the center line of the horizontal viewing angle at the VIP seat, and the ordinary audience seat showed a serious color shift. Here is a golden rule:​Horizontal viewing angle center line = main viewing area center line ±5°​​. For example, the shopping mall atrium screen must be aimed at the intersection of the escalator. The line of sight formula H=345×point spacing ×16 mentioned in web page 3. When used in horizontal layout, a correction coefficient should be added - when the viewing angle exceeds 30°, the optimal line of sight should be shortened by 20%.

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​Parameter adjustment hides the devil's details​
Last year, in Singapore’s arc-shaped advertising screen project, the horizontal color was found to be uneven during debugging. The problem lies in​Low bright high gray technologyParameter mismatch: 1. The horizontal brightness gradient must be set to 3 levels of transition (such as 4000cd/m² on the left → 5000cd/m² in the middle → 4500cd/m² on the right) 2. Grayscale correction must be sampled in 5 areas 3. The horizontal refresh rate synchronization error must be <0.01ms. Special reminder: Supports high-refresh screens with 1920Hz, and the horizontal scanning interval must be set to 8ms to eliminate drag.

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​​You need to play black technology in special scenarios​​
When encountering a transparent video wall with 86% transmittance, the horizontal setting must consider the penetration display. There is a trick:​Convert the PWM frequency of the driver IC to 14KHz​​, which can reduce the reflectivity of transverse pixel points on the glass surface by 60%. The column installation method mentioned on web page 7 must follow the "three-three system" when used in ultra-wide screens: a load-bearing column is installed every 3 meters, and each column controls the power supply independent circuit of 3 rows of pixels in the horizontal direction.

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A customer asked: "Why are there glare still there after all the parameters are adjusted?" Eighty percent of them fell on ambient light. A Dubai outdoor screen suffered this loss - the incident angle of sunlight at 10 am just 35° with the screen, and the solution is​Plated nanopolarized film on the surface of transverse lamp beads​​. Now the horizontal anti-glare coating of high-end screens can achieve 89% light transmittance, which is 3 times higher than traditional processes.

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Speaking of power supply configuration, this is a life gate for horizontal stability. For IP65 protective screens used in sports venues, horizontal power supply must follow the "dual loop + hot backup" principle: a distribution unit is set up every 6 meters, and the power lines of adjacent units must be cross-moved. The 5V power supply system emphasized by Web 8, when used in ultra-long horizontal screens, a voltage compensator must be installed to ensure that the farthest voltage fluctuates by no more than ±0.2V.

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The editor finally nagged: Don’t be superstitious about the nominal value on the parameter table, on-site debugging is the king. Those teams who talk about 24-hour technical support are still helping customers adjust the horizontal gamma value at 3 a.m. During the next acceptance, remember to use a spectrometer to measure the color temperature deviation of each horizontal point - the real skill is to control it within ±50K. After all, the audience's eyes are much more picky than instruments, do you think?

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