Microstructured Reflective Walls for Wide-Angle Mini LED Color Control
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Solution Overview
Problem
Mini/Micro LED display technology faces significant challenges with chromatic aberration at large view angles due to varying light intensities of different colors, leading to color shifts and reduced display quality.
Innovation Solution
A display panel design featuring light-emitting units surrounded by first reflective walls with a height greater than the units, and a microstructure layer positioned away from the substrate, which overlaps the reflective walls and disperses large-angle light to improve chromatic aberration and light efficiency. The microstructure layer and reflective walls can be integrated, with a functional layer and filling layers incorporating black composites and light-transmitting materials to enhance contrast and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Mini/Micro LED display technology is used to achieve high display contrast and excellent image quality, then display performance is improved, but chromatic aberration occurs at large view angles due to varying light intensities of different colors
Solution Approach 1:
The patent applies local quality by implementing a microstructure layer with varying depths positioned at different locations around the light-emitting unit. The microstructure depth is specifically designed to be greater at locations corresponding to colors with higher light intensity (such as blue LEDs) and smaller at locations corresponding to colors with lower light intensity (such as red LEDs). This localized variation in microstructure depth compensates for the varying light intensities of different colors, reducing chromatic aberration at large view angles while maintaining high display contrast.
2Productivity
If reflective walls with height greater than light-emitting units are introduced to improve light efficiency, then light output is enhanced, but device complexity increases
Solution Approach 1:
The patent merges the reflective wall structure with the microstructure layer into an integrated component. The microstructure layer is formed directly on the reflective wall, combining the light-reflecting function and the chromatic aberration compensation function into a single integrated structure. This reduces the number of separate components and simplifies the manufacturing process while maintaining enhanced light output efficiency.
Solution Approach 2:
The reflective wall structure serves multiple functions: it reflects light to enhance light output efficiency, and when combined with the microstructure layer, it also compensates for chromatic aberration. The microstructure layer itself serves dual purposes by both reflecting light and providing chromatic compensation through its varying depth profile, thereby reducing overall device complexity while achieving multiple performance goals.
3Manufacturing precision
If a microstructure layer is added to disperse large-angle light and reduce chromatic aberration, then chromatic aberration is reduced from 30% to less than 12%, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs parameter changes by varying the depth parameter of the microstructure layer across different spatial locations. The microstructure depth is specifically optimized for each color channel based on the light intensity characteristics of the corresponding LED (e.g., deeper structures for blue light, shallower for red light). This parameter variation enables precise chromatic aberration compensation while maintaining a relatively simple overall structure that can be manufactured using standard semiconductor fabrication techniques.
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
The solution significantly reduces chromatic aberration from 30% to less than 12%, improves light output efficiency by 20%-200%, and maintains high contrast, while potentially reducing panel thickness and enhancing brightness uniformity.
Implementation Method 1
first reflective walls, each arranged surrounding the light-emitting unit
Implementation Method 2
a first microstructure layer, located on a side of the first reflective wall away from the substrate... disperses large-angle light
Data Source
AI summary
A display panel relates to the display technical field, including a substrate; at least one light-emitting unit, located on the substrate; first reflective walls, arranged surrounding the light-emitting unit, wherein a height of the first reflective walls along a direction perpendicular to the substrate is greater than a height of the light-emitting unit along the direction perpendicular to the substrate; and a first microstructure layer, located on a side of the first reflective wall away from the substrate, wherein orthographic projections of the first microstructure layer on the substrate at least overlap orthographic projections of the first reflective walls on the substrate, and a distance between the first microstructure layer and the substrate along the direction perpendicular to the substrate is greater than or equal to a distance between a surface of the first reflective walls away from the substrate and the substrate along the direction perpendicular to the substrate.