Light Emitting Element Electrode Current Distribution
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Solution Overview
Problem
Conventional light-emitting elements experience uneven current density distribution on the light extraction surface due to the lack of elongated portions on the electrodes, leading to non-uniform luminance distribution, which cannot be adequately addressed by increasing the number of elongated portions alone.
Innovation Solution
The light-emitting element features a semiconductor portion with an upper electrode arranged in a specific pattern, including first and second external connectors, inward and outward elongated portions, which are strategically positioned to distribute current uniformly across the light extraction surface, reducing the difference in current density between inner and outer regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional electrode arrangement is used, then manufacturing is simple, but current density distribution is uneven
Solution Approach 1:
The electrode is segmented into multiple functional components: external connectors, inward elongated portions extending into the semiconductor layer, and outward elongated portions extending beyond the light extraction surface. This segmentation allows different regions of the electrode to serve different purposes in current distribution, achieving uniform current density while maintaining a structured, manufacturable design.
Solution Approach 2:
The electrode structure extends in multiple dimensions: inward elongated portions extend vertically into the semiconductor layer, while outward elongated portions extend horizontally beyond the light extraction surface. This multi-dimensional arrangement enables comprehensive current distribution across the entire semiconductor layer, addressing the uniformity issue without excessive complexity.
2Manufacturing precision
If number of elongated portions is increased, then current distribution improves slightly, but uneven distribution remains
Solution Approach 1:
Different portions of the electrode are designed with different characteristics: external connectors provide current input points, inward elongated portions penetrate into the semiconductor layer to distribute current vertically, and outward elongated portions extend beyond the surface to distribute current horizontally. This local differentiation of electrode functions achieves comprehensive current uniformity without requiring excessive numbers of identical structures.
3Illumination intensity
If electrode structure is optimized for current uniformity, then luminance distribution improves, but manufacturing complexity increases
Solution Approach 1:
The electrode structure performs multiple functions simultaneously: it provides electrical connection through external connectors, distributes current vertically into the semiconductor layer via inward elongated portions, distributes current horizontally across the surface through outward elongated portions, and serves as a structural framework. This multi-functionality achieves comprehensive luminance uniformity without requiring separate components for each function, thereby limiting manufacturing complexity.
Data Source
AI summary
A light-emitting element includes a semiconductor portion, an upper electrode and a lower electrode. The upper electrode includes a plurality of first external connectors, a plurality of second external connectors, a first inward elongated portion extending from each of the first external connectors, a second inward elongated portion extending from each of the second external connectors, a first outward elongated portion extending from each of the first external connectors toward a side opposite to a side where the second external connectors are disposed, and connecting two first external connectors next to each other, and a second outward elongated portion extending from each of the second external connectors toward a side opposite to a side where the first external connectors are disposed, and connecting two second external connectors next to each other.