Micro LED Light Guide Structure Sidewall Extension
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Solution Overview
Problem
Current methods for transferring micro light emitting diodes (LEDs) are inefficient due to the size and shape of the contact area between the holding structure and the micro LED, affecting the yield rate of delivery and transfer.
Innovation Solution
A micro device design featuring an epitaxial structure with a light guide structure that includes a connecting portion on the edge of the epitaxial structure, extending along the sidewall, and a covering portion on the top surface, where the connecting portion's width at the edge is smaller than the width away from the top surface, enhancing both side and forward light-emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between the holding structure and the micro LED is increased to improve transfer reliability, then the yield rate of delivery and transfer improves, but the size and shape of the contact area become difficult to control, affecting manufacturing precision
Solution Approach 1:
The holding structure is divided into multiple holding portions that contact different regions of the micro LED, with each portion having optimized contact area. This segmentation allows the total contact area to be increased for reliability while each individual contact region maintains precise dimensional control for manufacturing accuracy.
Solution Approach 2:
Different regions of the holding structure have different contact area characteristics - some regions have larger contact areas for reliability while others have precisely controlled smaller areas for manufacturing precision. The holding structure incorporates varying contact geometries optimized for their specific functional requirements.
2Ease of operation
If a holding structure is used to hold the micro LED for easier transfer, then the ease of operation improves, but the complexity of the device structure increases
Solution Approach 1:
The holding structure serves multiple functions: it holds the micro LED for transfer, provides alignment features, and maintains proper orientation during the transfer process. By combining these functions into a single integrated structure, the ease of operation is improved without proportionally increasing device complexity.
Solution Approach 2:
The holding structure merges the gripping function, alignment function, and transfer function into a single integrated component. This consolidation simplifies the overall system compared to using separate components for each function, thereby improving ease of operation while limiting the increase in device complexity.
Data Source
AI summary
A micro device includes an epitaxial structure and a light guide structure. The epitaxial structure has a top surface. The light guide structure is disposed on the top surface, and the light guide structure includes a connecting portion and a covering portion. The connecting portion is disposed on an edge of the epitaxial structure and extends along a sidewall of the epitaxial structure. The covering portion is disposed on the top surface and connected to the connecting portion. A width of the connecting portion at the edge of the epitaxial structure is smaller than a width away from the top surface.