Integrated Circuit Packaging with Conformal Interconnects

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Solution Overview

Problem

As integrated circuit packages shrink in size, there is a growing need for increased electrical connections with precise spacing to support higher functionality, speed, and performance, while also reducing costs and improving reliability, which existing technologies have not adequately addressed.

Innovation Solution

The method involves a base substrate with conformal interconnects of varying deformation heights, which are used to attach a stack substrate, eliminating electrical shorting and accommodating thermal expansion mismatches through thermal compression bonding without reflow processing, allowing for fine pitch interconnections and reduced package size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If package size is reduced, then product size and weight are reduced, but the number of electrical connections must increase to maintain functionality

Engineering Contradiction:

Improvepackage sizeVSAvoidnumber of electrical connections

Core Design Contradiction:

Volume of moving objectVSQuantity of substance

Solution Approach 1:

The patent transitions from planar interconnection to three-dimensional vertical stacking, allowing multiple electrical connections to be arranged in the vertical dimension rather than requiring increased lateral spacing. This enables high-density interconnections in a compact footprint by utilizing the Z-axis for signal routing between layers.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent implements nested packaging where one package is positioned directly over another with interconnects extending vertically between layers. This nested configuration allows multiple functional units to be integrated in a compact vertical arrangement, increasing connection density without proportionally increasing overall package volume.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Quantity of substance

If the number of electrical connections increases, then functionality and performance are improved, but spacing precision requirements increase

Engineering Contradiction:

Improvenumber of electrical connectionsVSAvoidspacing precision

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent replaces traditional mechanical alignment methods with magnetic field-based self-alignment. Magnets embedded in the package structures generate magnetic fields that automatically guide and position interconnects during assembly, eliminating the need for high-precision mechanical positioning and reducing manufacturing complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs self-aligning interconnects that automatically position themselves through magnetic attraction and field interactions during the assembly process. This self-service mechanism ensures precise spacing and alignment without requiring external positioning equipment or complex alignment procedures.

Inventive Principle:

Principle #25Self-service

3Device complexity

If thermal compression bonding is used instead of reflow processing, then manufacturing complexity is reduced, but control over interconnect deformation becomes more critical

Engineering Contradiction:

Improvemanufacturing complexityVSAvoidinterconnect deformation control

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent incorporates magnets and magnetic materials into the package structures during manufacturing, before the thermal compression bonding process. This preliminary action creates pre-established magnetic fields that will automatically guide and control interconnect alignment and deformation during the subsequent bonding process, simplifying manufacturing while maintaining precision.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes changes in magnetic field strength and distribution during thermal compression bonding to control interconnect deformation and positioning. By adjusting magnetic parameters rather than relying solely on mechanical or thermal parameters, the process achieves precise control with reduced manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution enables efficient, reliable, and cost-effective high-density electrical connections with improved thermal stability and reduced manufacturing complexity, addressing the challenges of increasing functionality and performance in smaller packages.

Implementation Method 1

accommodating thermal expansion mismatches through thermal compression bonding

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS8299596B2Integrated circuit packaging system with bump conductors and method of manufacture thereof

Publication Date: 2012.10.30 STATS CHIPPAC LTD

AI summary

A method of manufacture of an integrated circuit packaging system includes: providing a base substrate having a component side; mounting a base device having a base circuit connector directly on the component side; attaching conformal interconnects, having the same pre-deformation height from the component side, directly on the component side and offset from the base device; and attaching a stack substrate having stack interconnects directly on the conformal interconnects, portions of the stack interconnects covered by the conformal interconnects having different deformation heights from the component side.