3D Circuit Interconnection via Microdispensed Conductive Adhesive
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Solution Overview
Problem
Current 3D packaging and interconnection technologies are limited in creating dense arrays of stacked memory or processing IC chips, primarily focusing on increasing capacity and processing power within a limited footprint, and lack flexibility in building circuits on conformal surfaces or without substrates.
Innovation Solution
The method involves constructing true 3D electronic circuits by microdispensing electrically conducting adhesive or re-flowable solder paste to interconnect ICs and components, allowing for flexible placement on any surface, including conformal and substrate-less environments, using direct writing techniques and computer-controlled systems for precise placement and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If soldering connections are used to interconnect stacked IC chips, then electrical interconnection is achieved, but the method is limited to planar substrates and lacks flexibility for conformal surfaces
Solution Approach 1:
The patent replaces traditional mechanical soldering processes with a direct-write microdispensing system that deposits conductive adhesive materials. This substitution enables circuit construction on conformal and non-planar surfaces by using a robotic arm with a microdispensing tool that can precisely place conductive material along desired interconnection paths, overcoming the limitations of conventional soldering methods that require planar substrates and precise alignment fixtures.
Solution Approach 2:
The invention changes the physical state and application method of conductive materials from molten solder requiring high-temperature processing to room-temperature or low-temperature conductive adhesives that can be deposited by microdispensing. This parameter change allows for flexible application on conformal surfaces and eliminates the need for complex soldering equipment and thermal management, thereby improving manufacturing flexibility while maintaining electrical interconnection functionality.
2Ease of manufacture
If pre-aligned arrays of contact pads are used, then electrical connection is achieved, but the method requires complex alignment and dipping processes
Solution Approach 1:
The patent extracts and eliminates the complex alignment and dipping equipment from the manufacturing process. Instead of using pre-aligned contact pad arrays that require sophisticated positioning systems and molten solder vats, the invention uses a microdispensing tool mounted on a robotic arm that directly writes conductive adhesive paths between contact pads. This removes the need for expensive alignment fixtures and dipping equipment, significantly simplifying the manufacturing process while maintaining connection precision.
Solution Approach 2:
The microdispensing system performs self-alignment by using vision guidance and feedback control to automatically position the dispensing nozzle relative to contact pads. The system captures images of the substrate, identifies contact pad locations, and dynamically adjusts the dispensing path to ensure accurate interconnection without requiring pre-aligned arrays or complex external alignment equipment. This self-service capability eliminates the need for sophisticated alignment machinery.
3Productivity
If dense arrays of stacked IC chips are manufactured, then capacity and processing power increase, but heat dissipation becomes difficult
Solution Approach 1:
The patent transitions from planar two-dimensional circuit layouts to three-dimensional stacked architectures with vertical interconnections. By using direct-write microdispensing to create conductive paths that can traverse vertical surfaces and connect between stacked IC chips, the system achieves high-density integration in the third dimension. This dimensional transition increases capacity and processing power while distributing heat generation across multiple levels, improving thermal management compared to dense planar arrangements where heat accumulates in a single plane.
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 approach enables the creation of 3D circuits with high volumetric density, improved heat dissipation, and flexibility in building circuits in limited spaces, allowing for interconnections on non-planar surfaces and without substrates, enhancing cooling and component placement efficiency.
Implementation Method 1
microdispensing electrically conducting adhesive or re-flowable solder paste to interconnect ICs and components
Implementation Method 2
re-flowable solder paste
Data Source
AI summary
A method for manufacturing an electronic circuit in three-dimensional space provides for interconnecting electronic components within the circuit by directly writing conducting lines. The method may include observing a direct writing tool of a direct write system using a vision system, determining proper placement of the direct writing tool at least partially based on the step of observing, and directly writing conducting lines in three dimensions using the proper placement. The direct writing may be on a surface or in free space. The method may include stacking a plurality of chips to provide a stack having a top surface and edges extending away from the top and interconnecting connections of the chips by directly writing conducting lines along one of the edges.