Light Emitting Element Electrode Layout for Short-Circuit Insulation
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Solution Overview
Problem
Existing light emitting elements face challenges in preventing short circuits and maintaining light characteristics due to protruding semiconductor layers and inadequate insulating film thickness, leading to electrical instability and deteriorated light output.
Innovation Solution
A light emitting element design featuring a first and second semiconductor layer, an emission layer, and an insulating film that encloses their side surfaces, with an electrode layer having a bottle cap shape and protrusions, ensuring uniform thickness and preventing short circuits, while maintaining improved light characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating film encloses the electrode layer, then electrical insulation is improved, but manufacturing complexity increases due to additional patterning steps
Solution Approach 1:
The patent extracts the electrode layer from the insulating film enclosure, making the insulating film optional. The insulating film is formed only when electrical insulation is required, while the electrode layer can function independently without being enclosed, thereby reducing manufacturing complexity while maintaining reliability when needed
Solution Approach 2:
The insulating film is applied partially rather than universally enclosing the electrode layer. It is formed selectively on specific regions where insulation is required, such as on the semiconductor layer or in specific areas of the substrate, avoiding unnecessary manufacturing steps in regions where insulation is not needed
2Reliability
If the semiconductor layers are made to protrude for electrode contact, then electrical connection is improved, but short circuit risk increases due to inadequate insulation
Solution Approach 1:
The patent applies local quality by making the insulating film thickness non-uniform. The insulating film is thicker in regions where short circuit prevention is critical, while being thinner or absent in regions where electrical connection is prioritized. This localized variation in insulating film properties allows simultaneous optimization of both electrical connection and short circuit prevention
Solution Approach 2:
The insulating film serves as an intermediary element between the semiconductor layers and the electrode layer. It provides selective insulation that enables proper electrical connection in some areas while preventing short circuits in others, mediating between the conflicting requirements of electrical connectivity and insulation
3Reliability
If the electrode layer is formed to cover the insulating film, then electrical stability is improved, but light characteristics deteriorate due to increased absorption
Solution Approach 1:
The electrode layer is formed partially rather than completely covering the insulating film. It is deposited only in specific regions where electrical stability is required, leaving other regions exposed to maintain light characteristics. This partial coverage approach balances electrical stability with light output efficiency
Solution Approach 2:
The electrode layer is segmented into multiple discrete regions rather than forming a continuous covering layer. This segmentation allows the electrode to provide electrical stability in specific areas while leaving gaps that preserve light transmission and emission characteristics in other areas
Data Source
AI summary
A light emitting element may include a first semiconductor layer, an emission layer disposed on the first semiconductor layer, a second semiconductor layer disposed on the emission layer, an insulating film, and an electrode layer. The insulating film may enclose a side surface of the first semiconductor layer, a side surface of the emission layer, and a side surface of the second semiconductor layer. The electrode layer may be disposed on the second semiconductor layer and the insulating film. The insulating film may not enclose the electrode layer.