Semiconductor Light Emitting Element Electrode Segmentation
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Solution Overview
Problem
Nitride semiconductor light emitting elements face challenges in uniformly applying current over larger light emitting faces and ensuring uniform light emission, leading to decreased light output.
Innovation Solution
A semiconductor light emitting element design with a first and second pad electrode on the same side, divided into three regions, where the first pad electrode is in the middle and the second pad electrodes are on both sides, with extending electrodes to distribute current uniformly, reducing drive voltage and maintaining high light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the light emitting element size is increased to output more light, then light output increases, but current distribution uniformity deteriorates
Solution Approach 1:
The light emitting element is divided into three regions in the lengthwise direction, with pad electrodes strategically positioned in the middle region and both side regions. This segmentation allows current to be introduced at multiple locations, ensuring uniform current distribution across the entire light emitting face even as the element size increases.
Solution Approach 2:
Pad electrodes are specifically positioned in the middle region and both side regions rather than uniformly distributed, creating localized current introduction points that collectively achieve uniform current distribution across the enlarged light emitting face.
2Manufacturing precision
If a transparent p ohmic electrode is formed over the entire surface to diffuse current, then current distribution improves, but device complexity increases
Solution Approach 1:
Instead of using a single transparent p ohmic electrode covering the entire surface, the invention segments the electrode structure into discrete pad electrodes positioned in specific regions (middle and both sides), simplifying the overall electrode configuration while maintaining current distribution uniformity.
Solution Approach 2:
The invention extracts the essential function of current diffusion from the transparent p ohmic electrode and implements it through strategically positioned pad electrodes, eliminating the need for a complex full-surface transparent electrode structure.
Data Source
AI summary
The present disclosure relates to a semiconductor light emitting element. The semiconductor light emitting element has a first conductivity type layer, a light emitting layer, and a second conductivity type layer that are laminated; a first pad electrode provided to the first conductivity type layer; and second pad electrodes provided to the second conductivity type layer. The first pad electrode and the second pad electrode is disposed on the same side of the semiconductor light emitting element. Plan view shape of the semiconductor light emitting element is rectangular. The first pad electrode is disposed in a middle region of three regions of the semiconductor light emitting element. The three regions are defined by dividing the light emitting element into three equal parts in the lengthwise direction of the semiconductor light emitting element. The second pad electrodes are respectively disposed in regions on both sides of the three regions.