In some of the LED screen involved in the occasion, we more or less will meet this situation – the original clear LED screen has some twisted, irregular stripes.
This is the moire effect LED screen, LED screen to form this kind of interference pattern of a variety of reasons, the solution also has a variety of methods, this article will introduce the causes of moire effect LED screen and response methods.
What is the moire effect?
Sometimes when the LED screen video playback, we will obviously see some dense, irregular long stripes or ripples, this LED screen display phenomenon we call moire effect.
The moire effect is a visual distortion of the visual presentation, when the LED screen display two similar patterns overlap, there will be a distorted irregular moire effect pattern.
What is the cause of the moire effect LED screen?
LED screen specification problem
In most cases, the cause of moire effect is caused by the low specification of the LED screen itself.
Too low resolution
The resolution of LED display screen is too low, there is no way to display too fine content when displaying the screen, the pattern to be expressed in close proximity to the details can be easily overlapped or blurred, so moire effect will be generated.
Pixel points are not aligned
There are some poor quality LED screens where the arrangement of the lamp beads is not completely accurate. This situation will lead to inconsistency in the distance between the LED lamp beads (i.e. pixel points), and the light emitted when displaying the pattern will overlap, thus leading to moire effect.
Low refresh rate
The refresh rate of the LED display is too low to keep up with the speed of the content source when displaying images, and the LED screen will look like flickering or dynamic visual blurring, accompanied by moire effect streaks.
Color deviation
Do not do a good job in advance of the LED screen color calibration settings, will make the display screen color inaccurate, there is a difference in the original color will be incorrectly displayed as the same color, and then produce a fusion of overlap, visually it looks like the LED screen has a color ripple.
Anti-aliasing technology is not done
LED display anti-aliasing technology can make the screen in the display screen, the pattern edge is sharper and smoother, the pattern and the pattern between the demarcation line will be more obvious, LED display anti-aliasing technology is too poor will lead to the pattern display of the edge of the fusion.
Playback settings are not correct
Using video control software to set the parameters if and content source does not match, will also lead to playback screen blur, image boundary is not clear, produce moire effect.
Incompatibility
Software incompatibility
Incompatibility between the control software used and the driver of the LED display will lead to unclear screen playback and ultimately show blurred and overlapping edges of the pattern.
Resolution Incompatibility
When the resolution of the content source is too low, and the resolution of the LED display is higher than the resolution of the content source, the playback of the screen is blurred, the pattern and the pattern of the direct line of demarcation is not clear, and finally form the moire effect that we see with our naked eyes.
Content Problems
Content is too small
The pattern of the screen part of the content source is too delicate and tiny, when the resolution specification of the LED display is too low, it is difficult to display it clearly, and the related pattern presented in the end will have a broken and blurred display result.
Pixelated images
Some creative content itself is the pixelated effect of the pattern, only applicable in some with a fixed pixel density of the LED screen playback, otherwise the content source and the LED screen pixel density once the mismatch will produce fuzzy ripples.
Image contrast is too high
The image contrast of the content source is too high, and when the grayscale of the LED display screen is difficult to show the contrast of the content source image, the edge will also show a slight halo, similar to the blurring effect, and finally form a moire effect.
Physical Problems of LED Screen
Lighting interference
The external light shines on the playback content of the LED display, which is easy to cause reflections, and the fusion of the reflected external light and the light emitted from the LED screen will also produce a moire effect.
Poor quality cable
LED display using poor quality cable will lead to display current instability, this unstable current will make the LED screen image imaging brightness is also unstable, unstable image brightness will be layered to form interference ripples.
Physical damage
Physical damage occurs in the LED screen, damaged places such as cracks or scratches will affect the passage of light, resulting in the surrounding LED light beads emitted by refraction and change the angle of light, resulting in halo blur.
Viewing Angle
An inappropriate viewing angle will cause the light from different LED beads to overlap when entering the line of sight, i.e. the moire effect.
What is the effect of moire effect on LED screen?
Rainbow effect
The moire effect LED screen usually has brightly colored combination of circular ripples, the specific color of the ripples is based on the color of the picture shown on the LED screen itself.
Text and image distortion
The ripples formed by the light may cause the image to distort, so moire effect LED screen the image will be distorted in the range where the ripples are created.
These patterns are distorted in a visual way, more typical of text figures and other patterns slightly broken, the image appears blurred and distorted, text and image changes as if there is a residual shadow dragging behind it, and there are also pattern edges are not clear and jagged.
Screen Flickering
Due to the moire effect LED screen caused by the refresh rate is too low, usually also accompanied by the shortcomings of the screen flicker, the refresh rate is too low will make the LED screen display has a sense of jumping, the display screen is not coherent, the viewing experience is poor.
Poor clarity and contrast
The moire pattern caused by the LED screen overall display screen fuzzy, low clarity, light ripples very affect the viewing experience, the screen contrast is also difficult to show, pattern visibility is reduced.
Color banding
The moire effect LED screen also has a kind of interference pattern shape is more than the wave pattern to be more hard stripes, this kind of stripe-like moire effect LED screen, its screen is usually accompanied by jams, color band shape is obvious.
Distracting
All of the above are moire effect LED screen will lead to the screen display problems, these problems will make the audience in front of the LED screen distraction, the quality of the screen is too poor, the audience is difficult to concentrate on watching the screen.
Looks cheap
The picture quality of the LED display screen is reduced because of moire pattern, which will make the LED display screen look cheap and unimpressive, similarly, if the brand that uses moire effect LED screen for publicity will also be labeled as cheap.
Therefore, no matter whether it is the stage or brand publicity, must use good quality, good performance LED display, so as not to give the audience a bad impression and perception.
How to solve the moire effect of LED display?
Content
First of all, choose a large spacing between patterns, less interference with the screen can effectively avoid the generation of moire effect.
Secondly, ensuring that the image resolution of the content source video and the resolution of the LED screen are the same can reduce unnecessary image blurring and distortion.
Add anti-aliasing technology
Using anti-aliasing algorithms to make the edges of adjacent patterns fine and sharp can effectively reduce pattern edge overlap and blurring of LED screen images.
Pixel Shift Technology
By slightly shifting the position of the pixels on the screen, the pixel points and the light emanating from the light completely overlap visually, reducing unnecessary artifacts and halos.
Illumination
When using LED screen to play video, reduce the direct illumination of the display from other surrounding lights to avoid the formation of interfering light ripples on the LED screen.
Smoke
Using a smoke machine to spray smoke around the LED screen can reduce the moire effect caused by the reflection of light from the LED screen.
Camera
If you need to use a camera to shoot the LED screen to make a video, you can solve the moire effect by the following methods.
By adjusting the camera parameters, such as changing the camera shutter speed, so that the camera shutter speed and the refresh rate of the LED screen synchronization, so that the camera in the shooting can ignore the LED screen moire effect.
If the moire effect LED screen is caused by the resolution, you can adjust the camera focal length to make the image of the LED screen appear clearer in the camera.
Change the angle and distance when the camera is shooting, sometimes the moire effect will not appear at some specific distance or specific angle.
Utilizing software
Using software to adjust the playback parameters of the LED screen, optimize the resolution, and adjust the layout of the screen can reduce the moire effect and greatly improve the visual effect of the LED screen.
Optical Filter
Adding an optical filter to the LED display, which is usually made of micro-mesh or acrylic resin, blocks the visibility of the moire effect with this optical filter, which effectively reduces the moire effect for the audience’s visual viewing.
Matte Coating
A matte transparent coating is applied to the LED screen, which works in a similar way to an optical filter, but at a lower cost. This matte coating also reduces light reflection and avoids overlapping of light to form a moire effect.
Calibration and Testing
Before playing the screen, the LED screen for symmetry, color and brightness and other display settings of the calibration and testing, if there is found moire effect, but also in advance to prevent and improve, can guarantee the follow-up LED screen video playback to achieve the expected picture display effect.
Adjust the viewing distance
Audience distance from the LED screen is too far or too close are not conducive to viewing, if there is a moire effect, you can try to solve the problem by adjusting the appropriate viewing distance.
Replacement of LED screen
Some LED screen quality is too poor to form moire effect, may be too poor quality of LED lamp beads, resulting in luminous brightness is not uniform and unstable, may also be the quality of the LED driver IC chip is too poor, resulting in refresh rate is too low, resulting in moire effect.
In these cases, the best solution is to replace the LED screen with a better quality one to avoid using moire effect LED screen from the root.
If you have the need to buy, you can consult JYLED, as an experienced LED manufacturer, our LED screen quality is more guaranteed.
Conclusion
The effect of moire effect on LED screen is huge, it will reduce the audience’s viewing patience to a certain extent, reduce the viewing experience, therefore, in the discovery of such phenomena, must be resolved in a timely manner, to avoid the publicity effect of your LED screen greatly reduced.
