One-Layer IC Substrate Asymmetry for Warpage Control
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Solution Overview
Problem
The challenge lies in developing an integrated circuit packaging system that balances miniaturization, increased density, and cost reduction for portable electronic devices, as existing technologies fail to fully address integration, space savings, and cost efficiency.
Innovation Solution
A method involving a one-layer substrate with a symmetrical structure, featuring redistribution pads only on the insulation top side, mounting an integrated circuit, and forming an encapsulation to provide structural integrity and reduced warpage, while eliminating the need for additional layers that cause thermal expansion mismatches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple layers are added to the substrate to increase integration density, then the packaging capacity increases, but thermal expansion mismatches and warpage increase
Solution Approach 1:
The patent applies asymmetry by positioning redistribution pads only on the insulation top side rather than symmetrically on both sides. This asymmetric configuration, combined with the one-layer substrate design, creates a structure that compensates for thermal expansion differences without requiring multiple layers, thereby maintaining integration density while reducing warpage caused by thermal expansion mismatches.
Solution Approach 2:
The patent extracts the problematic multiple-layer configuration and replaces it with a simplified one-layer substrate structure. By removing unnecessary layers while maintaining essential functionality through strategic pad placement, the design achieves integration density without the thermal expansion issues inherent in multi-layer constructions.
2Reliability
If substrate layers are reduced to minimize thermal expansion mismatches, then warpage is reduced, but structural support and integration capacity may be compromised
Solution Approach 1:
The patent applies local quality by concentrating functional elements (redistribution pads) at specific locations on the insulation top side rather than distributing them uniformly across multiple layers. This localized functional arrangement maintains integration density while preserving the simplicity and thermal stability of the one-layer substrate structure.
Solution Approach 2:
The patent transitions from a vertical multi-layer architecture to a horizontal functional arrangement on a single layer. By redistributing pads across the top surface of the insulation layer rather than stacking layers vertically, the design achieves integration density through spatial optimization in two dimensions while maintaining one-layer structural simplicity.
3Volume of moving object
If complex multi-layer structures are used to achieve miniaturization, then packaging density increases, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts the essential functionality from complex multi-layer structures and implements it in a simplified one-layer configuration. By removing unnecessary layers while retaining core packaging functions through strategic pad placement, the design achieves miniaturization without the manufacturing complexity and cost associated with multi-layer constructions.
Solution Approach 2:
The patent merges multiple functions that would traditionally require separate layers into a single integrated substrate structure. The one-layer substrate with strategically positioned redistribution pads combines support, insulation, and electrical connection functions that would otherwise require multiple layers, thereby reducing manufacturing complexity while achieving miniaturization.
Data Source
AI summary
A method of manufacture of an integrated circuit packaging system includes: forming a one-layer substrate with a symmetrical structure, the one-layer substrate having a redistribution pad and an insulation, the redistribution pad only at an insulation top side of the insulation; mounting an integrated circuit over the one-layer substrate; and forming an encapsulation over the integrated circuit.