Stacked Multi-Color LED Structure With Larger Emitting Area
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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 etching processes that increase manufacturing difficulty and reduce the light emitting area.
Innovation Solution
A light emitting device with a stacked structure comprising multiple LED parts, each emitting different colors, connected by adhesive and conductive coupling patterns and through structures that allow for vertical stacking and electrical coupling without the need for extensive etching, enhancing manufacturing ease and light emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex stacking and etching processes are used to achieve multi-color emission, then color display capability is improved, but manufacturing difficulty increases and light emitting area is reduced
Solution Approach 1:
The device is divided into multiple independent light emitting parts (first, second, third light emitting parts), each capable of emitting different colors. These segmented parts are stacked vertically and connected through coupling patterns, allowing each part to be manufactured and optimized independently while collectively achieving multi-color emission without requiring complex etching processes across the entire structure.
Solution Approach 2:
The patent transitions from a planar arrangement to a vertical stacked structure. Multiple light emitting parts are arranged in the vertical dimension (stacked one above another) rather than side-by-side in the same plane. This dimensional change allows for compact multi-color emission while simplifying manufacturing, as each stacked layer can be processed independently and connected through vertical coupling patterns.
2Adaptability or versatility
If complex stacking and etching processes are used to achieve multi-color emission, then color display capability is improved, but light emitting area is reduced
Solution Approach 1:
By arranging multiple light emitting parts in the vertical dimension through stacking, the patent maximizes the use of the substrate area for light emission. Each light emitting part contributes to the overall light emitting area without requiring lateral expansion or complex etching that would reduce the effective emission surface. The vertical arrangement preserves maximum planar area for light output.
Solution Approach 2:
The coupling patterns are integrated within the stacked structure, with first coupling patterns located between the first and second light emitting parts, and second coupling patterns between the second and third light emitting parts. This nesting of connection structures within the vertical stack minimizes the space required for electrical connections, thereby maximizing the light emitting area of each individual part.
3Ease of manufacture
If stacked structure with coupling patterns is used, then manufacturing ease is improved, but device complexity increases
Solution Approach 1:
Each light emitting part follows a consistent structural pattern comprising an n-type semiconductor layer, active layer, p-type semiconductor layer, and transparent electrode. The coupling patterns between layers also follow a homogeneous design with adhesive regions and conductive patterns. This repetition of standardized modules simplifies manufacturing processes while the systematic arrangement manages structural complexity through predictability and modularity.
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 enables a compact, efficient, and reliable multi-color LED device with improved electrical reliability and reduced manufacturing complexity, allowing for larger light emitting areas and easier processing.
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
Light emitting diodes, as inorganic light sources, are being diversely used in various fields
Implementation Method 3
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, and a length between first and second corners of the third light emitting part is less than a length between third and fourth corners of the third light emitting part.