Screen Door Effect Elimination in Micro-LED Displays
Micro-LED displays face distinct visual challenges at viewing distances under 30cm, where the physical gaps between pixels become perceptible as a screen door effect. Current designs achieve pixel densities of 200-300 PPI, but even at these resolutions, the inactive areas between emitters can create visible mesh patterns that degrade image quality and viewer immersion.
The fundamental challenge lies in maximizing the active emission area while maintaining the electrical isolation and thermal management requirements of densely packed micro-LED arrays.
This page brings together solutions from recent research—including curved light diffusion layers, anisotropic optical stacks, optimized sub-pixel LED distributions, and multi-layer diffusion techniques. These and other approaches focus on practical methods to improve perceived image continuity without compromising display brightness or reliability.
1. Micro LED Display Panel with Uniformly Distributed Sub-Pixel Micro LED Array
SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD., 2018
Micro LED display panel with improved resolution, reduced screen door effect, and lower cost compared to conventional micro LED displays. The panel has an array of sub-pixel areas on the substrate, each filled with uniformly distributed micro LEDs. This allows higher resolution by packing more LEDs in each sub-pixel without increasing inter-pixel gaps. By optimizing the number of LEDs per sub-pixel, it balances resolution, screen door effect, and cost compared to using a single large LED per sub-pixel. The micro LEDs are transferred using a process like micro transfer printing.
2. Centralized Control System for Dynamic Adjustment of Photoelectric Parameters in Micro LED Transparent Screens
SICHUAN HUALING PHOTONICS TECH CO LTD, SICHUAN HUALING PHOTONICS TECHNOLOGY CO LTD, 2023
Intelligently adjusting photoelectric parameters of Micro LED transparent screens to improve display quality and efficiency. The method involves using a central processor to communicate with the individual RGB light source modules on the screen. By intelligently adjusting parameters like brightness, color, and power consumption of each module, it balances uniformity, contrast, and efficiency across the screen. This mitigates issues like brightness non-uniformity, outdoor visibility, cost, and power dissipation in Micro LED transparent displays.
3. Segmented LED Arrays with Integrated Diffusing Elements and Inter-segment Walls
Lumileds LLC, 2022
Segmented LED arrays with diffusing elements to improve uniformity and reduce patterns when using secondary optics. The arrays have LED segments separated by walls. Diffuser material is placed directly over the LEDs or wavelength converter to scatter light before it reaches secondary optics like lenses. This avoids patterns when using focus techniques. The diffuser can be columns, domes, or a continuous layer over multiple LEDs.
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