Is this happening often - the welcome words for opening celebrations are stuck at the bottom of the screen, and the mall promotional information is crowded in the corner? What's even more crazy is that the software is clearly centered, but the subtitles are like drunken when playing. Don’t worry, today we will break it apart and explain the century-old problem of "subtitle drift".

​​Tell me the heartbreaking truth first​: 90% of the subtitle offsets are not screen quality issues, but omissions in the debugging process. Remember these three key inspection points, which can help you save at least 5,000 yuan in after-sales repair costs.

Hardware calibration: check these three physical positioning first

1. ​Box splicing error​
   Especially the quick disassembly structure of the rental screen, the 1mm dislocation between the boxes is 10cm offset to the entire screen. Teach you a local method:

• When the lights are turned off at night, use a laser pointer to illuminate the splicing seam
• Observe whether the light spots are aligned in adjacent boxes
• The error exceeds 2mm and the snap position must be recalibrated

1. ​​Receive card address code conflict​
   Overlapping of multiple receiving card control areas will lead to subtitles "ghosts", and this hidden fault is often misjudged as a software problem.

• Enter the control system background
• Check whether the physical coordinates of each receiving card are continuous
• The address code must be incremented in the order of "left to right, top to bottom".

1. ​​Supply voltage fluctuations​
   Unstable voltage will cause the driver chip to work abnormally. When the measured voltage is lower than 4.8V, the subtitle position will be randomly offset by 3-5 pixels.

• Multimeter measures the voltage at the output terminal of the power supply
• It must be stable at 5V±2% under full load operation state
• The cost of installing a voltage stabilization module is about 200 yuan per screen

Software settings: Five sets of parameters determine success or failure

​​The key point is here!​​ Many engineers have failed at this point, especially the following two hidden settings:

1. ​​Virtual Screen Size Trap​
   The resolution of 1920x1080 is set in the software. If the actual physical pixel is 1952x1100, the subtitles will inevitably be offset. Remember this formula:

实际水平像素 = 单块模组宽像素 × 横向模组数  
实际垂直像素 = 单块模组高像素 × 纵向模组数

1. ​Graphics card output zoom​
   This pitfall hurts countless novices - the computer is set to center, but the large screen display is offset. Follow this process:

• Win10 system: Right-click the desktop → Display settings → Zoom and layout → Change to 100%
• Nvidia graphics card: Control panel → Adjust desktop size → Select "Full Screen"
• AMD graphics card: Settings → Monitor → GPU zoom → Enable full screen

Environmental interference: Don't step on these minefields

Last year, a shopping mall suffered a huge loss - it cost 230,000 yuan to install a large screen, with normal subtitles during the day, but crooked at night. Later, it was discovered that these two major sources of interference:

1. ​​Strong electromagnetic field interference​

• The elevator motor generates a 300μT magnetic field when running
• The radiation value of the distribution room exceeds 50V/m
• Solution: Install magnetic shield (cost about 80 yuan/square meter)

1. ​​Day and night temperature deformation​
   The steel structure bracket will cause thermal expansion and contraction of 0.12mm/m every 10℃ temperature difference, which is a fatal injury to the small-pitch screen below P2.5.

• Physical calibration is done in the early morning and afternoon
• Aviation aluminum box with thermal expansion coefficient ≤2.3×10⁻⁶/℃ is used

​​Exclusive data disclosure​​：
Industry surveys in 2024 showed that 61% of subtitle offset failures were caused by software setup errors, and the average repair time of such problems was 17 hours. What's even more amazing is that 29% of engineers were recovered after project acceptance because they did not conduct electromagnetic environment testing.

Next time you encounter "running around" subtitles, don't rush to scold the manufacturer. Follow this process: Hardware calibration → Software verification → Environmental detection to ensure that you can lock in the root cause of the problem within 3 hours. Remember, good screens are made, not bought!

for more product information and pricing, please contact us .