Stacked Multi-Color LED Structure With Conductive Coupling Layers
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Solution Overview
Problem
Current light emitting diodes (LEDs) used in display devices face challenges in achieving a compact and efficient structure for multi-color emission, as they require complex stacking and precise alignment of multiple LED layers, which complicates manufacturing and reduces the light emitting area.
Innovation Solution
A light emitting device with a stacked structure comprising multiple LED parts, each emitting different colors, is designed with adhesive and conductive coupling patterns and through structures that electrically connect the layers without the need for etching, simplifying the manufacturing process and increasing the light emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LED layers are stacked to achieve multi-color emission, then the light emitting device can display various colors, but the manufacturing complexity increases and the light emitting area decreases
Solution Approach 1:
The patent combines multiple LED layers (first, second, and third light emitting parts with different colors) into a single stacked structure that functions as one integrated light emitting device. The adhesion layers and coupling patterns merge the electrical and mechanical functions across layers, allowing multi-color emission from a unified structure rather than separate components.
Solution Approach 2:
The patent transitions from planar arrangement of LED layers to a vertical stacked configuration. By stacking LED layers in the thickness direction rather than arranging them side-by-side, the device achieves multi-color emission while maintaining a compact footprint and simplifying the manufacturing process through vertical integration.
2Adaptability or versatility
If multiple LED layers are stacked to achieve multi-color emission, then the light emitting device can display various colors, but the light emitting area is reduced
Solution Approach 1:
The patent resolves the area reduction issue by moving the multi-color emission functionality from the planar dimension to the vertical dimension. Multiple LED layers are stacked in the thickness direction, allowing each layer to contribute to color diversity without reducing the horizontal light emitting area, as light is emitted from the top surface of the stacked structure.
Solution Approach 2:
The patent implements a nested structure where multiple LED layers are arranged concentrically or in a compact stacked configuration. The first, second, and third light emitting parts are positioned such that they occupy vertical space rather than horizontal space, maximizing the light emitting area while maintaining multi-color capability.
3Adaptability or versatility
If complex stacking and precise alignment of multiple LED layers is used, then multi-color emission is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces adhesion layers with coupling patterns as intermediary elements between LED layers. These coupling patterns serve as alignment references and mechanical anchors, eliminating the need for high-precision direct alignment between LED layers. The coupling patterns guide the stacking process and ensure proper positioning without requiring advanced alignment techniques.
Solution Approach 2:
The patent incorporates coupling patterns and adhesion layers during the LED layer fabrication process itself, rather than adding them separately afterward. This preliminary integration of alignment features simplifies subsequent stacking operations and reduces the precision requirements for final assembly, as the alignment references are already built into the structure.
4Adaptability or versatility
If traditional LED stacking method is used, then multi-color emission is achieved, but the device size increases
Solution Approach 1:
The patent compactes the device volume by arranging multiple LED layers vertically in the thickness direction rather than horizontally. This dimensional reorganization allows the light emitting device to maintain a small footprint while achieving multi-color emission, as the vertical stacking utilizes the Z-axis space rather than expanding the X-Y plane dimensions.
Solution Approach 2:
The patent merges multiple LED layers into a single integrated stacked structure with shared support elements and compact interconnections. By combining the functions of multiple layers into one unified device rather than using separate components, the overall device volume is reduced while maintaining multi-color emission capability.
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 allows for a more efficient and compact multi-color emission with reduced manufacturing complexity, enhancing the electrical reliability and light transmittance of the device.
Implementation Method 1
a first adhesion layer disposed between the first and second light emitting parts and including first coupling patterns that are adhesive and conductive
Implementation Method 2
first coupling patterns that are adhesive and conductive
Implementation Method 3
Light emitting diodes, as inorganic light sources, are being diversely used in various fields
Implementation Method 4
Each pixel of a display device may include blue, green, and red sub-pixels
Data Source
AI summary
A light emitting device including a first light emitting part including a first n-type semiconductor layer, a first active layer, a first p-type semiconductor layer, and a first transparent electrode, a second light emitting part disposed over the first light emitting part and including a second n-type semiconductor layer, a second active layer, a second p-type semiconductor layer, and a second transparent electrode, and a third light emitting part disposed over the second light emitting part and including a third n-type semiconductor layer, a third active layer, a third p-type semiconductor layer, and a third transparent electrode, in which the light emitting device has substantially a quadrangular shape when viewed from the top, and has first to fourth corners.