Coplanar Fluidic Interconnect Polymer Base Silicon Die
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Solution Overview
Problem
Existing micro-fluidic processing systems face challenges in efficiently and cost-effectively manipulating and routing fluid droplets on small scales due to material limitations and impedance issues at interconnects, limiting their complexity and precision.
Innovation Solution
A coplanar fluidic interconnect design is implemented, where a polymer or copolymer base layer integrates a silicon die with fluidic actuators, allowing for precise control of fluid flow across a smooth surface, reducing assembly costs by using less expensive materials for the base layer while maintaining precise fluidic control with the die.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a silicon base layer is used for fluidic interconnect, then manufacturing precision and reliability are improved, but assembly cost increases
Solution Approach 1:
The device is segmented into two functional parts: a polymer base layer for structural support and cost-effectiveness, and a separate silicon die for precise fluidic control. This segmentation allows each component to be optimized independently - the polymer provides mechanical stability at lower cost while the silicon die maintains manufacturing precision for fluidic operations.
Solution Approach 2:
The invention uses a composite structure combining polymer and silicon materials. The polymer base layer (e.g., epoxy or polyimide) provides mechanical support and cost benefits, while the silicon die embedded within provides precise fluidic control. This composite approach resolves the contradiction by combining the advantages of both materials without requiring the entire structure to be made from expensive silicon.
2Device complexity
If material impedance variations are introduced at interconnects, then manufacturing complexity increases, but fluid flow efficiency decreases
Solution Approach 1:
The polymer base layer acts as an intermediary material between the silicon die and the external environment. It provides a compliant, low-impedance interface that mediates fluid flow transitions, reducing impedance variations at interconnect boundaries. This intermediary layer smooths out material property transitions and maintains fluid flow efficiency despite the multi-material construction.
3Productivity
If coplanar integration is achieved between base layer and die, then fluid flow impedance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Coplanarity is achieved locally at the critical interface between the polymer base layer and silicon die, rather than requiring the entire device structure to be perfectly flat. The polymer layer is designed with local thickness variations to compensate for die height differences, creating a coplanar surface only where fluid flow occurs. This localized approach maintains fluid flow efficiency while reducing overall manufacturing precision requirements.
Data Source
AI summary
An apparatus includes a polymer base layer having a surface. A die has a surface that is substantially coplanar with the surface of the polymer base layer. The die includes a fluidic actuator to control fluid flow across the surface of the die. A fluidic channel is coupled to the polymer base layer to provide a fluidic interconnect between the die and a fluidic input/output port.