Light-Emitting Element Reflective Layer Isolation Structure
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Solution Overview
Problem
Display devices face the challenge of preventing electrical short circuits between electrodes, particularly in light-emitting elements, which can occur due to the conductive nature of reflective layers and connection electrodes.
Innovation Solution
A light-emitting element design featuring a second semiconductor layer, an active layer, a first semiconductor layer, and insulating and reflective layers arranged to prevent direct contact between the reflective layer and the common electrode, with a connection electrode connected through an opening, ensuring electrical isolation and reducing the likelihood of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective layer is used in the light-emitting element, then light extraction efficiency is improved, but electrical short circuit risk increases due to the conductive nature of the reflective layer
Solution Approach 1:
An insulating layer is introduced as an intermediary between the reflective layer and the common electrode. This insulating layer prevents direct electrical contact while allowing the reflective layer to maintain its light extraction function, thereby resolving the contradiction between improved illumination and reduced short circuit risk.
Solution Approach 2:
The structure is segmented into distinct functional layers: the reflective layer for light extraction, the insulating layer for electrical isolation, and the common electrode for electrical connection. This segmentation allows each layer to perform its specific function without interfering with others, particularly preventing electrical short circuits while maintaining light extraction efficiency.
2Ease of operation
If connection electrodes are added to connect the light-emitting element, then electrical connectivity is improved, but the complexity of the structure increases
Solution Approach 1:
The connection electrode is merged with the existing reflective layer structure. The connection electrode extends from the reflective layer through the insulating layer to the common electrode, combining the light extraction function and the electrical connection function into a integrated structure, thereby improving connectivity without proportionally increasing complexity.
3Reliability
If multiple layers are added to prevent short circuits, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The insulating layer is designed to completely cover the reflective layer, creating an equipotential electrical isolation barrier. This design ensures that even with manufacturing variations, the insulating layer maintains continuous coverage over the conductive reflective layer, preventing short circuits without requiring extremely precise alignment.
Data Source
AI summary
A light-emitting element includes a second semiconductor layer, an active layer above the second semiconductor layer, a first semiconductor layer above the active layer, a first insulating layer surrounding side surfaces of the first semiconductor layer, the active layer, and the second semiconductor layer and an upper surface of the first semiconductor layer, and defining a first opening at the upper surface of the first semiconductor layer, a reflective layer surrounding side surfaces of the first semiconductor layer and the active layer and an upper surface of the first semiconductor layer on the first insulating layer, and a second insulating layer on the reflective layer and on a portion of the first insulating layer on which the reflective layer is not located, defining a second opening on an upper surface of the first semiconductor layer, and having one end having a step with one end of the reflective layer.