Light Emitting Element Electrode Structure for Uniform Emission
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Solution Overview
Problem
Existing light emitting elements experience uneven current density distribution between electrodes, leading to insufficient uniform emission.
Innovation Solution
The light emitting element features a semiconductor structure with specifically designed first and second electrodes, including extending portions that diffuse current uniformly across the semiconductor stack, with the second electrode entirely located inward of the second extending portions and the fourth extending portions extending parallel to the first extending portions, reducing current accumulation and promoting uniform diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional electrode structures are used with one electrode at center and other embracing it, then current distribution is improved, but uneven distribution still occurs between electrodes causing insufficient uniform emission
Solution Approach 1:
The first electrode is segmented into multiple extending portions (first, second, third extending portions) that are spatially distributed across the semiconductor structure. This segmentation allows current to be introduced at multiple locations, improving current distribution uniformity and reducing concentration at single points.
Solution Approach 2:
Different extending portions of the first electrode are positioned at specific locations (center, sides, corners) of the semiconductor structure, providing localized current introduction where needed. This local quality approach ensures uniform current distribution across different regions of the light emitting element.
2Manufacturing precision
If electrode extending portions are added to improve current diffusion, then manufacturing complexity increases
Solution Approach 1:
The first electrode combines multiple functions into a single structure: it serves as both the primary current introduction electrode and includes integrated extending portions for current diffusion. The second electrode simultaneously provides current introduction and embraces the first electrode for structural support and additional current distribution, reducing the need for separate components.
Solution Approach 2:
The first electrode structure is designed to perform multiple functions: introducing current at the center, extending to sides for lateral current distribution, and reaching corners for comprehensive coverage. This multi-functionality reduces the need for additional specialized electrodes while achieving uniform current distribution.
Data Source
AI summary
A light emitting element includes: a semiconductor structure; first and second electrodes formed above the semiconductor structure; and a protective film. In a plan view: the first electrode has a first connecting portion, a first extending portion, and two second extending portions, the second electrode has a second connecting portion, and two third extending portions, the first extending portion extends linearly in a direction from the first connecting portion toward the second connecting portion, the two second extending portions are located on opposite sides of the first extending portion, respectively, with each of the second extending portions having two bent portions and a linear portion extending parallel to the first extending portion and located between the two bent portions, and the two third extending portions are located between the first extending portion and the two second extending portions, respectively.