With the LED screen put into the market in large quantities, we will gradually encounter some uncommon display faults, such as the problem of LED screen ghosting. Today, let’s go through this article to understand: LED screen ghosting.
What is LED screen ghosting
LED screen ghosting is an irregular light ripple produced by the blurring of the edges of the display pattern, and this light ripple will produce greater interference to the audience watching the display screen.
Some LED screen ghosting interference will only be generated when the camera shoots, the naked eye has no effect on viewing; but some LED screen ghosting interference is more serious, the human eye at certain angles and distances can be directly viewed.
This kind of ghosting LED screen that produces interference pattern, sometimes we also call it moire effect.
Comparison of LED screen ghosting and LCD ghosting example
Example of LED screen ghosting
LED screen ghosting phenomenon has long stripes, manifested as thin rectangular discordant light patterns; there is also a ghosting phenomenon as ripples, manifested as a circle of irregular colored light patterns.
LCD ghosting example
LCD ghosting is when the display pattern change or move, LCD can not keep up with the speed of the object changes, the screen will be a short time residual pattern of ghosting, specifically manifested as a solid pattern around a misty track.
LED screen ghosting test
Oscilloscope tracking
Connect the probe of the oscilloscope directly to the cathode line of the LED, observe and record the electrical signal image curve depicted by the oscilloscope, and speculate whether there is a lack of LED screen signals, and whether it is due to the faulty electronic components that lead to distortion of the signal transmission of the LED screen, resulting in the LED screen signal confusion and ghosting.
Strobe Analysis
The use of high frame rate camera on the LED screen shooting test, can be able to intuitively detect the LED display screen playback screen flicker frequency whether there is a blur, observe the camera to capture the pattern whether there is ghosting phenomenon.
Personnel test
Find 30~50 volunteers to watch the LED display, let the subjects rate the clarity of the image movement of the LED screen, and finally come up with the assessment of LED screen ghosting.
Possible causes of LED screen ghosting
Refresh rate is too low
If the refresh rate of the LED screen is too low, the image processing update speed of the screen will not be able to keep up with the speed of the image movement, and the screen will produce motion blur, which leads to LED screen ghosting.
Signal interference
LED screen normal playback content requires a signal transmission process, interference in the process will lead to unstable signal transmission, resulting in unstable LED screen picture, ghosting.
Too long use of heat
Some of the screen LED packaging technology is better heat dissipation, but there are some LED screens in order to protect better, choose the LED packaging technology heat dissipation will be relatively poor.
When the LED screen for a long time work, the resistance of the internal electronic components will be very serious, thus affecting the operation of some components of the display response time slows down, resulting in LED screen ghosting.
Driver IC failure
When the driver IC fails, the signal reception of the LED screen will be inaccurate, which will lead to the screen confusion and ghosting.
Ambient light interference
LED screen installation environment is too bright and chaotic light, these chaotic ambient light irradiation to the LED screen launch, reflected light and the LED screen itself issued by the light fusion, will lead to the LED screen pattern is not clear, resulting in ghosting.
How to repair LED screen ghosting
LED screen repair should be based on the specific causes to the right medicine, such as LED screen ghosting, the cause may be very complex, may also be very simple, find the right problem and then solve the problem will get twice the result with half the effort.
Adjust the refresh rate
If the LED screen refresh rate is too low resulting in ghosting, you can use video control software to adjust the LED screen refresh rate settings, sometimes for the concept of energy saving, we will set the LED display screen in a LED screen is not the highest refresh rate that can be achieved, adjust the LED screen refresh rate becomes higher, the screen will become smooth, thus reducing LED screen ghosting.
Check signal transmission
LED screen ghosting due to unstable signal transmission, to figure out whether it is the environmental magnetic field interference caused by unstable signal transmission, or poor cable connection caused by unstable signal transmission.
If the environmental magnetic field interference, you can use shielding such as anti-interference equipment to reduce the impact of the environmental magnetic field; if the signal line is poorly connected, try to reconnect the signal line or replace the signal line with a new one.
LED screen cooling
LED display heat caused by ghosting, first of all, you can try to turn off the LED display to let it cool down quickly, and secondly, check the installation environment of the LED screen, whether it is reserved enough vents, in the process of use, we need to clean the vents on a regular basis, to avoid dust, dirt clogging the vents, blocking the airflow in and out.
In addition, when running the LED screen, pay attention to set the screen brightness suitable for the environment, to avoid screen over-brightness caused by unnecessary power loss and screen heating.
When the temperature cools down to the normal range, the LED screen ghosting caused by heat generation will be solved.
Replace the driver IC
If the driver IC is faulty, you can only replace the faulty driver IC. This is a more complicated process, we can not operate by ourselves, we need to contact a professional LED screen technician to replace it. When the replaced driver IC works normally, the screen error will no longer be generated and the LED screen ghosting will disappear.
Use special coating
Brush the LED screen with a kind of transparent matte coating, this kind of matte coating can reduce the reflection of external light, reduce the overlap between the reflected light and the LED screen light source, which can effectively reduce the LED screen ghosting.
Conclusion
Generally speaking, it is difficult to produce ghosting phenomenon on LED screen, if you encounter such a situation, you don’t need to worry, the cause of LED screen ghosting may be very simple, you follow the steps in this article to carry out a simple check to find the problem, and easy to solve.
If you encounter difficult to solve the problem, you can also consult JYLED, we will have professional technicians to help you.
