Many users notice a particular detail when operating advertising displays: at the moment of startup or shutdown, the screen occasionally shows brief interference patterns or flickering. This inevitably raises the question—is my advertising display broken?
In response to this common "advertising display power-on/power-off interference pattern" issue, we offer you a professional explanation.
I. Are Power-On/Power-Off Interference Patterns a Malfunction? In Most Cases, They Are Normal
First of all, rest assured. In the vast majority of cases, brief interference patterns appearing on the advertising display screen during startup or shutdown are a normal physical phenomenon, not a device malfunction. They do not affect the lifespan or daily playback performance of the advertising display.
II. Why Do Power-On/Power-Off Interference Patterns Occur?
Why does this happen? The main reasons are related to the internal structure and working principles of advertising displays:
Power Sequence Timing Differences:
The power supply, mainboard, and screen of an advertising display need to start up and shut down in sequence. During the moments of startup or shutdown, there are millisecond-level micro-delays in power delivery to each component. This brief "coordination mismatch" can cause signal asynchrony, which manifests as fleeting interference patterns on the screen.Liquid Crystal Molecular Response Characteristics:
LCD screens rely on voltage to drive the arrangement of liquid crystal molecules to form images. During the sharp voltage fluctuations at power-on or power-off, the liquid crystal molecules enter a brief "unstable" state, which can trigger momentary visual noise.
In simple terms, this is similar to how a light bulb might flicker momentarily when switched on or off—it is a normal response of the components to changes in electrical current.
III. How to Distinguish Between "Normal Phenomenon" and "Actual Malfunction"?
By understanding the following points, you can easily perform a self-check:
Characteristics of a Normal Phenomenon:
Extremely Brief Duration: The interference patterns or flickering last only 1–3 seconds, disappearing as the screen fully lights up or turns off.
Fixed Timing: Occurs only at the moment of startup or shutdown. During stable operation, the display is clear and steady.
Warning Signs of a Malfunction (Contact After-Sales Service):
Interference patterns appear repeatedly or persistently during normal playback.
Startup/shutdown interference patterns do not disappear for an extended time (exceeding 5 seconds) or are accompanied by unusual noises or odors.
Fixed lines, dark spots, or color patches appear on the screen.
The device fails to start normally and gets stuck on the interference pattern screen.
IV. Conclusion and Recommendations
In summary, power-on/power-off interference patterns on advertising displays are a common and normal phenomenon, and there is no need for excessive concern.
We are always committed to providing you with high-quality, reliable digital display equipment. Every product that leaves our factory undergoes rigorous quality inspection.
"This article is part of the 'Advertising Machine FAQ' series. If you are experiencing other issues, such as unresponsive touch screens, black screens, etc., feel free to visit our [Advertising Machine Common Problems and Solutions (FAQ) Center | Ultimate Troubleshooting and Maintenance Guide] for quick answers."