Semiconductor Package Guide Rings Prevent Electrical Shorts
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Solution Overview
Problem
In semiconductor packaging, existing technologies face challenges in preventing electrical shorts between electrodes in wafer-level chip size packages, which can lead to reduced productivity and yield due to misalignment and contact between solder balls.
Innovation Solution
The introduction of a guide ring structure around the electrodes, which can be configured as a tube or pillars, positioned between the substrates to prevent electrical shorts, using dielectric or high-molecular materials, and supported by photo solder resists, ensures proper alignment and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no guide ring structure is used, then the device complexity is low, but electrical shorts between electrodes occur reducing reliability
Solution Approach 1:
A guide ring structure is introduced as an intermediary element between adjacent electrodes. The guide ring is formed of dielectric material and positioned around the electrode periphery, physically separating adjacent electrodes to prevent electrical shorts while maintaining overall device functionality.
Solution Approach 2:
The guide ring structure segments the continuous dielectric material into discrete regions around each electrode. This segmentation allows for targeted insulation at critical locations where electrical shorts are most likely to occur, rather than requiring complete encapsulation of the entire electrode array.
2Reliability
If guide ring structure is added, then reliability improves by preventing electrical shorts, but manufacturing precision requirements increase
Solution Approach 1:
The guide ring structure is formed prior to electrode placement and solder ball attachment. By establishing the guide ring boundaries first, subsequent manufacturing steps can align to these pre-defined structures, reducing the cumulative alignment errors that would occur if multiple structures were formed sequentially without reference features.
Solution Approach 2:
The guide ring serves as an intermediary reference structure that mediates alignment between different manufacturing steps. Its dielectric material provides a stable, non-conductive surface that can be used as a alignment marker for subsequent electrode and solder ball placement, reducing the stringency of direct electrode-to-electrode alignment requirements.
3Productivity
If guide ring structure is used, then production yield increases, but device complexity increases
Solution Approach 1:
The guide ring structure applies complexity only where it is most needed - at the periphery of electrodes where electrical shorts are most likely to occur. The dielectric material is concentrated in discrete guide ring regions rather than being uniformly distributed, providing targeted protection while minimizing overall structural complexity and material usage.
Solution Approach 2:
The guide ring structure performs multiple functions simultaneously: it provides electrical insulation between adjacent electrodes, serves as an alignment reference for subsequent manufacturing steps, and maintains the structural integrity of the dielectric material during processing. This multi-functionality reduces the need for additional separate structures, offsetting the complexity increase with functional consolidation.
Data Source
AI summary
An example embodiment relates to a semiconductor package. The semiconductor package includes a first substrate including a first pad, a second substrate upwardly spaced apart from the first substrate and including a second pad opposite to the first pad. At least one electrode is coupled between the first pad and the second pad. The semiconductor package includes a guide ring formed at a periphery of the electrode between the first substrate and the second substrate.