Micro-LED Ring Pattern Structure for Front Luminance Uniformity
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Solution Overview
Problem
Current display devices face challenges in achieving high front luminance, minimizing luminance deviation with viewing angles, improving mura phenomenon, and maintaining high luminance.
Innovation Solution
The implementation of a display device design that includes a micro light emitting diode (micro-LED) with a ring-shaped pattern disposed on the substrate, and a cover layer on top of these patterns, which enhances light extraction efficiency and adjusts the pattern shape to optimize luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional LED structure is used, then the device is simple to manufacture, but the front luminance is insufficient
Solution Approach 1:
The patent divides the LED structure into multiple functional layers including a substrate, light-emitting layer, extraction layer with patterns, and cover layer. This segmentation allows each layer to be optimized independently for light emission and extraction, thereby increasing front luminance while maintaining manufacturability through modular construction
Solution Approach 2:
The patent introduces patterned structures in the extraction layer that create dimensional variations on the LED surface. These patterns (such as protrusions or recesses) add a third dimension to the otherwise planar LED structure, enhancing light extraction efficiency and front luminance without significantly complicating the manufacturing process
2Reliability
If a simple LED structure is used, then manufacturing is easier, but luminance deviation according to viewing angle occurs
Solution Approach 1:
The patent applies different properties to different regions of the LED structure. The extraction layer contains patterns with varying geometries (different sizes, shapes, or distributions) in different areas to locally optimize light extraction. This local quality variation compensates for viewing angle-dependent luminance deviations while maintaining overall structural simplicity
Solution Approach 2:
By introducing vertical patterns and three-dimensional structures in the extraction layer, the patent creates multiple light extraction paths at different angles. This dimensional complexity helps uniformize luminance across different viewing angles without requiring complex manufacturing processes
3Reliability
If no light extraction enhancement is applied, then the device structure remains simple, but the mura phenomenon occurs
Solution Approach 1:
The extraction layer is segmented into multiple patterned regions that independently manage light extraction from different parts of the LED. This segmentation prevents localized light trapping that causes mura effects, while the modular pattern design keeps manufacturing complexity manageable
Solution Approach 2:
The introduction of three-dimensional patterns in the extraction layer creates additional light extraction interfaces and paths. This dimensional enhancement scattering and redirecting light more uniformly, thereby eliminating mura phenomena without requiring complex multi-layer structures
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly improves front luminance, reduces luminance deviation with viewing angles, enhances color reproducibility, and addresses the mura phenomenon, resulting in a display device with high luminance and efficiency.
Implementation Method 1
a light emitting diode disposed on the substrate
Implementation Method 2
a light emitting diode (LED) is attracting attention as a next generation display device
Implementation Method 3
a plurality of patterns which is disposed on the light emitting diode and has a ring shape... to improve a light extraction efficiency
Data Source
AI summary
Provided is a display device. The display device comprises a substrate, a light emitting diode disposed on the substrate, a plurality of patterns which is disposed on the light emitting diode and has a ring shape, and a cover layer on the plurality of patterns, wherein the light emitting diode is a micro light emitting diode (micro LED).