LED Cell Shielding Structure for Color Mixing Isolation
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Solution Overview
Problem
Light emitting diodes (LEDs) used in display devices and lighting face challenges with color mixing due to their miniaturization and compactness, leading to reduced color reproducibility and potential damage from external shocks.
Innovation Solution
A light emitting device design featuring a substrate with concave parts and a light shielding layer, including materials like Ti, Ni, Al, Ag, and Cr, that fills these concave areas between LEDs, preventing light interference and enhancing structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If light emitting diodes are miniaturized and arranged compactly, then device size is reduced, but color mixing occurs between neighboring cells
Solution Approach 1:
The patent introduces light shielding layers that divide the substrate into separate light emission regions, effectively segmenting the light paths of neighboring LEDs. This segmentation prevents color mixing while maintaining the compact arrangement of miniaturized LEDs, thus resolving the contradiction between small device size and color accuracy.
Solution Approach 2:
The light shielding layers are strategically positioned only in regions where color mixing occurs between neighboring LEDs, rather than uniformly across the entire substrate. This local application of shielding maintains overall device compactness while preventing color mixing in critical areas, balancing miniaturization with color reproducibility.
2Length of stationary object
If substrate thickness is reduced for thinness, then device thinness is improved, but structural strength decreases
Solution Approach 1:
The light shielding layers are integrated into the thin substrate structure, creating segmented regions that provide both optical isolation and structural reinforcement. These layers act as internal support elements that compensate for the reduced substrate thickness, maintaining structural integrity while enabling device thinness.
Solution Approach 2:
The patent employs composite material structures where light shielding layers (made of materials such as Ti, Ni, Al, Ag, or Cr) are combined with the substrate material. This composite approach enhances the mechanical strength of the thin substrate while maintaining its thin profile, resolving the contradiction between thinness and structural strength.
3Manufacturing 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 layers are merged with the existing substrate and LED cell structure, serving dual purposes of optical isolation and structural support. This integration approach prevents color mixing to improve color reproducibility while avoiding the need for separate, additional components, thus limiting the increase in device complexity.
Solution Approach 2:
The light shielding layers perform multiple functions simultaneously: they prevent color mixing between neighboring LEDs, provide structural reinforcement to the thin substrate, and can serve as electrical connection pathways. This multi-functionality improves color reproducibility while minimizing the increase in device complexity by avoiding redundant components.
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 neighboring LEDs, improving color reproducibility and protecting the thin substrate from external shocks, while concentrating light emission for better contrast.
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
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.