LED Light Shielding Structure for Mini Display Color Mixing
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Solution Overview
Problem
Light emitting diodes (LEDs) used in display devices and lighting face issues with color mixing due to their miniaturization and compactness, leading to reduced color reproducibility.
Innovation Solution
A light emitting device with a substrate having concave parts and a light shielding layer filled with materials like Ti, Ni, Al, Ag, or photoresist, which separates and shields light emitted by neighboring LEDs, preventing color mixing by reflecting or absorbing light to maintain color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light emitting diodes are miniaturized and made compact for display devices, then device size is reduced, but color mixing occurs between neighboring light emitting cells
Solution Approach 1:
The patent divides the substrate into multiple concave parts, each corresponding to a light emitting cell. These concave structures physically segment the light emission areas, preventing light from one cell from spreading to adjacent cells. This segmentation approach maintains compact device size while eliminating color mixing through spatial separation.
Solution Approach 2:
The patent applies different properties to different regions of the substrate by creating concave parts with light shielding layers filled with specific materials (such as black matrix or metal materials). These localized modifications provide light shielding only where needed between cells, while maintaining light emission properties in the active cell areas. This local quality approach prevents color mixing without affecting overall device compactness.
2Manufacturing precision
If light shielding layer is added to prevent color mixing, then color reproducibility is improved, but device complexity increases
Solution Approach 1:
The light shielding layer is nested within the concave parts of the substrate, utilizing the existing three-dimensional space created by the concave structures. This nesting approach integrates the light shielding function into the substrate architecture itself, rather than adding separate external components. The result is improved color reproducibility without proportionally increasing device complexity.
Solution Approach 2:
The concave parts serve multiple functions: they provide structural support for the light emitting cells, define the emission areas, and when filled with light shielding materials, prevent color mixing. This multi-functionality reduces the need for additional separate components, thereby improving color reproducibility while minimizing the increase in device complexity.
3Length of stationary object
If substrate is made thin for compactness, then device thickness is reduced, but structural integrity and shock resistance deteriorate
Solution Approach 1:
The patent introduces concave curved structures into the thin substrate. These concave parts with curved surfaces distribute mechanical stress more effectively than flat structures, enhancing the substrate's resistance to external shocks. The curvature allows the thin substrate to maintain structural integrity by preventing stress concentration points, thus improving shock resistance without increasing substrate thickness.
Solution Approach 2:
The concave parts segment the substrate into distinct regions, each providing localized structural support for the light emitting cells. This segmentation creates a more robust architecture where each concave region acts as an independent support structure, distributing mechanical loads and improving overall shock resistance. The segmented structure allows the substrate to remain thin while maintaining strength through distributed support points.
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 effectively prevents color mixing between adjacent LEDs, enhancing color reproducibility and maintaining the structural integrity of the thin substrate by concentrating light emission in smaller areas, thus improving contrast and preventing damage from external shocks.
Implementation Method 1
a light shielding layer filling at least a portion of the concave part and disposed between the plurality of light emitting cells
Implementation Method 2
preventing color mixing by reflecting or absorbing light to maintain color accuracy
Data Source
AI summary
A light emitting device including a cell area, a peripheral area surrounding the cell area, a light source disposed in the cell area and including at least one light emitting layer, a first light shielding layer disposed in the cell area and the peripheral area, a portion of the first light shielding layer overlapping with the light source, and a rough structure disposed in the cell area and overlapping with the light source.