Hey, have you noticed? When advertisements are broadcast on large LED screens in some shopping malls, there is always an "afterimage" when the screen is switched, just like the old TV signal is not good. What's wrong with this? Let me tell you,​ ​The problem lies in the "behind-the-scenes butler" of line blanking​ ​. Today we will take a look at this mysterious and critical technical link.

Line blanking is the "traffic police" of the screen"

Imagine what would happen if there were no traffic lights at an intersection? Line blanking is the traffic control system of the LED screen. Every time the screen refreshes, it must be​ ​Within 0.02 seconds​ ​Only by clearing the "traffic flow" (electric charge) of the previous row can the next row of images be displayed smoothly. If this job is not done properly, there will be annoying problems such as smearing and snowflakes on the screen.

I once visited a stage equipment exhibition and saw with my own eyes a screen that was not properly blanked - the singer's hair flipping movement directly turned into a "Thousand-Hand Guanyin". The technician later explained that this was​ ​The parasitic capacitance is not completely discharged​ ​It's caused by the same principle as always leaving some dirty water when changing the water in the pool.

Find the "nest" of row blanking"

Where is this technology hidden on the screen? Take apart the LED unit board and you will see,​ ​The row of silver contacts next to the row driver chip​ ​It is its combat headquarters. Here is a little trivia: the row blanking circuit of a high-end screen will​ ​coated with nano coating​ ​, dustproof and anti-static, protecting key components like a mobile phone film.

Don’t underestimate these sesame-sized parts! Last year, the screen on the main stage of a music festival had a crooked resistor and the blanking function stopped working. As a result, "ghosts" appeared on the live broadcast site, and the barrage was about "supernatural events", which made the organizer jump with anxiety.

Doorway in parameters

When selecting a screen, keep an eye on these three parameters:

1. ​​Refresh rate ≥1920Hz​ ​(The higher the value, the less smear)
2. ​​Blanking response time <5ms​​
3. ​​Adaptive voltage regulation​ ​(can automatically adjust according to temperature)

A friend who runs a hot pot restaurant suffered a loss: I bought a low refresh rate screen at a cheap price, but when I was filming TikTok, all the heat coming out of the pot turned into a mosaic. Later, I changed to a screen with smart blanking, and the details of the boiling butter were so clear that it directly became a check-in point for Internet celebrities.

Lessons learned during installation

Anyone who has installed screens knows that,​ ​Strong and weak current wiring must be separated​ ​. I once saw someone bundling signal wires and power wires together, and as a result, the electromagnetic interference caused the blanking circuit to confuse. The "50% off" in the promotional advertisement suddenly flashed to "5 pounds", and the customers were all confused.

The correct operation should be:

• The power cord runs on both sides of the metal frame
• The signal line passes through the central corrugated pipe
• Fix with nylon ties every 50cm
• Leave 10cm of room for movement around corners

You can’t guess the future trends

The latest technology now allows row blanking​ ​independent learning​ ​Screen content. For example, dynamic blanking is automatically enhanced when playing racing scenes, and power consumption is reduced when playing static posters. I heard that some high-end screens can still pass​ ​Cloud update blanking algorithm​ ​, as convenient as upgrading the mobile phone system.

But having said that, no matter how good the technology is, it still depends on the basic skills. Just like cooking, a Michelin chef must first know how to chop vegetables. You still have to be careful when selecting the screen​ ​Whole process quality inspection system​ ​and​ ​24 hours technical support​ ​, after all, no one wants to have trouble finding someone when the screen breaks down at three o’clock in the middle of the night, right?

Next time you see the silky smooth naked-eye 3D large screen, remember to give a thumbs up to the "unsung hero" of Line Blanking. It is like the work behind the scenes of the stage. The lower the sense of presence, the better the work is done!

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