Light Emitting Element Electrode Segmentation
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Solution Overview
Problem
Existing light emitting elements experience a bias in current density distribution between electrodes, leading to higher forward voltage and inadequate uniform light emission.
Innovation Solution
A light emitting element design featuring a first electrode with extended portions and a second electrode with additional extended portions, where the fifth extended portion extends between the third and fourth extended portions to the first external connector side, ensuring even current distribution by spreading concentrated current to areas with lacking current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the p-side electrode or n-side electrode is disposed in the center of the top face of the light emitting element with the other electrode surrounding the periphery, then the electrode structure is simplified, but the current density distribution becomes biased and forward voltage increases
Solution Approach 1:
The electrodes are divided into multiple segments: a first external connector and second external connector instead of single centralized electrodes. Multiple extended portions (first through fifth extended portions) radiate from each external connector, segmenting the current entry points and distributing current flow across different regions of the semiconductor layer, thereby reducing current density bias while maintaining structural simplicity
Solution Approach 2:
Different regions of the electrode structure are designed with different properties. The extended portions have varying lengths and orientations (first extended portion extends in first direction, second extended portion extends in second direction, etc.) to locally adapt to current distribution needs in different areas of the semiconductor layer, optimizing current uniformity without requiring complete structural complexity
2Ease of manufacture
If the electrode structure uses centralized or peripheral disposal, then manufacturing is easier, but light emission uniformity becomes inadequate
Solution Approach 1:
The electrode structure is segmented into multiple extended portions radiating from external connectors, which can be manufactured using standard photolithography and electrode deposition processes. The segmented design achieves uniform light emission by distributing current across multiple entry points without requiring complex multi-step manufacturing procedures, maintaining ease of fabrication while improving emission uniformity
Solution Approach 2:
The electrode structure transitions from two-dimensional centralized or peripheral disposal to a radial multi-directional configuration. The extended portions extend in different directions (first direction, second direction, third direction, fourth direction) from the external connectors, adding dimensional complexity to current distribution while maintaining planar manufacturing simplicity
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
A semiconductor light emitting element has a first electrode and a second electrode provided on a semiconductor layer; the first electrode has a first external connector and a first extended portion and second extended portion that extend from the first external connector, the second electrode has a second external connector , and a third extended portion , a fourth extended portion , and a fifth extended portion that extend from the second external connector , the third extended portion extends along the first extended portion and farther outside than the first extended portion , the fourth extended portion extends along the second extended portion and farther outside than the second extended portion , and the fifth extended portion extends an area between the third extended portion and the fourth extended portion to the first external connector side, and the fifth extended portion is either on a line that links a point on the first extended portion at the position closest to the second external connector and a point on the second extended portion at the position closest to the second external connector, or closer to the second external connector side than the line.