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Moiré Pattern is a typical visual interference phenomenon commonly found in high-precision display devices. As a professional team in the display industry, we have a deep understanding of the causes and impacts of moiré in LED screens and are committed to developing effective solutions to ensure the outstanding performance of our LED display products in high-definition filming and complex application scenarios.
Moiré Pattern on LED Displays
Moiré is an optical interference phenomenon that usually occurs when two periodic grid structures (such as the pixels of a display and the sensor of a camera) overlap. The essence of moiré is the mismatch of frequency and phase, resulting in visible wave-like patterns seen by the naked eye or captured by a camera. This phenomenon is particularly noticeable in LED displays and high-definition filming.
Principle:
The formation of moiré comes from the interaction of two different grids. When the frequencies of the two grids are close but not exactly matched, interference occurs in the image, producing new periodic wave-like patterns. This interference phenomenon can be likened to the superposition of water waves, where differences in frequency and phase create distinct oscillations. The direction and density of the waves vary with the angle and distance.
The upper part is the image information received by the shooting device, and the lower part is the image style presented by the display device.
Pixel Grid Density:
The pixel grid arrangement of LED displays is tight, and especially at high resolutions, the likelihood of conflict with the sensor density of the camera increases, causing moiré to appear more frequently.
Viewing Angle and Distance:
Different camera angles and distances affect the phase difference between grids, so adjusting the angle can alter the significance of the interference effect.
Controlling moiré is crucial in display technology design, especially in applications such as high-definition advertising, image capture, and live video broadcasting. Below are the primary technical approaches our company uses to suppress moiré:
Optimizing Pixel Pitch and Layout:
By adjusting the pixel density and arrangement of the LED screen, we can ensure that the frequency of the display does not conflict with that of common camera sensors. We can modify the grid distribution of the display or select specific pixel pitches to avoid visual interference caused by too high or too low frequencies.
Improving Micro-observation Effects:
During the design process, we use microscopic observation simulation technology to predict the risk of moiré under common angles and filming conditions. Through refined design adjustments, we can ensure that the LED module delivers interference-free visual performance across a wider range of angles, maintaining clarity and stability of the output.
Adjusting Camera Angle and Position:
Since the angle between the camera and the object can produce moiré patterns, slightly changing the camera angle (by rotating the camera) can eliminate or alter any existing moiré. Moving the camera left, right, up, or down can adjust the angle relationship and reduce moiré.
Using Front Filters:
A front filter installed on the CCD can adjust the exposure conditions to match the spatial frequency, effectively filtering out the high spatial frequency components of the image and reducing the likelihood of moiré formation. However, this will also reduce the sharpness of the image.
Choosing High-Quality Materials:
For the LED display itself, selecting high-quality materials can reduce the roughness of the screen surface, thereby minimizing light reflection and interference, and subsequently reducing the generation of moiré.
It is important to note that the effectiveness of these methods may vary depending on the specific environment and equipment used. Different application scenarios may require different methods for optimal results. In actual practice, combining multiple methods may be necessary to achieve the best moiré elimination.
Furthermore, in cases such as TV broadcasting, special equipment and software may be required to handle moiré issues efficiently, especially for live television programs and specific occasions.
Through in-depth research into the causes of moiré, we understand that controlling moiré is a key factor in delivering high-quality display effects. We are committed to using effective technological means to optimize display performance, ensuring that LED displays truly achieve high-definition, interference-free visuals that empower commercial and creative applications across multiple scenarios.
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