Micro-LED Display Structure With Shared Emission Layer for Color Purity
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Solution Overview
Problem
High resolution display devices using micro-LEDs face challenges in achieving efficient light emission and color quality due to complex manufacturing processes and separation of active layers for each subpixel, which can lead to reduced light efficiency and increased complexity in transfer technology.
Innovation Solution
A display device design where multiple subpixels share a single emission layer, with a current injection limitation layer and color converting layers to reduce unwanted color emission and improve light efficiency, and a direct growth process for the emission layer on the substrate to simplify manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate LED chips are used for each subpixel, then color quality can be controlled, but manufacturing complexity increases and light efficiency decreases
Solution Approach 1:
The patent combines multiple subpixels (red, green, blue) into a single integrated LED chip structure with a shared active layer, eliminating the need for separate chips. This merging approach maintains color quality through selective layer design while dramatically simplifying manufacturing by removing complex chip-by-chip assembly processes.
Solution Approach 2:
The single LED chip is designed to perform multiple functions simultaneously - generating red, green, and blue light through different quantum well layers within the same structure. This multi-functional design replaces the need for multiple specialized chips, reducing manufacturing complexity while maintaining color precision.
2Manufacturing precision
If separate LED chips are used for each subpixel, then color emission can be optimized, but light efficiency is reduced due to increased separation
Solution Approach 1:
By merging the active layers of multiple subpixels into a single continuous structure within one chip, the patent eliminates gaps and interfaces that would cause light loss. The shared active layer ensures efficient light generation across all subpixels while maintaining optimized color emission through selective quantum well design.
3Manufacturing precision
If micro-LED transfer technology is used, then high resolution can be achieved, but process complexity and difficulty increase significantly
Solution Approach 1:
The patent merges multiple subpixels into a single chip unit, which serves as a complete functional block. This approach maintains high resolution by preserving the fine pitch arrangement of subpixels while dramatically easing manufacturing, as the entire multi-subpixel chip can be fabricated in one process without complex transfer operations.
4Ease of manufacture
If current injection area is increased, then manufacturing is easier, but unwanted color emission increases
Solution Approach 1:
The patent applies local quality control by designing different quantum well layer structures in different regions of the active layer. Each region is optimized for its specific color emission while sharing the same current injection area. This allows large current injection areas for manufacturing ease while preventing unwanted color emission through localized layer design.
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 design enhances light efficiency and color quality by minimizing the separation of active layers and reducing unwanted color emission, while simplifying the manufacturing process by eliminating the need for complex LED chip transfer.
Implementation Method 1
an active layer 123, which generates blue light B when current is applied
Implementation Method 2
a red converting layer 160R for emitting red light R by converting the blue light B
Implementation Method 3
a green converting layer 160G for emitting green light G by converting the blue light B
Implementation Method 4
EP2999014A discloses metal reflective layers to improve the light extraction efficiency of an emission layer
Data Source
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AI summary
A display device is provided. The display device includes a substrate, an emission layer configured to emit light, the emission layer including a first semiconductor layer provided on the substrate, an active layer provided on the first semiconductor layer, and a second semiconductor layer provided on the active layer, and a plurality of color converting layers provided on the emission layer and configured to emit light of certain colors from light emitted from the emission layer.