Flexible Microelectronic Substrate With Integrated Dielectric Traces
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Solution Overview
Problem
Existing substrates for microelectronic assemblies face challenges in providing adequate connectivity and mechanical protection for complex devices with numerous input and output connections, particularly in applications like digital cameras and biometric devices, where conventional wire bonding or ball bonding techniques are inefficient.
Innovation Solution
A substrate with a dielectric structure bearing contact elements and unitary traces, where a first dielectric encapsulant is applied to expose the contact elements in one region, allowing for improved connectivity and mechanical integrity, and a method for fabricating such substrates by depositing a dielectric film, patterning, and etching to form conductive traces and pins, with a flexible second dielectric film encapsulating the traces for enhanced flexibility and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wire bonding or ball bonding techniques are used to connect flexible cables to substrate terminals, then connectivity is achieved, but the process becomes complex and inefficient for devices with numerous input and output connections
Solution Approach 1:
The patent merges the connection functionality directly into the substrate structure by integrating conductive traces and contact elements into the substrate itself, eliminating the need for separate wire bonding or ball bonding processes. This integration allows multiple connections to be established simultaneously during substrate fabrication, dramatically improving connection efficiency while reducing process complexity.
Solution Approach 2:
The conductive traces and contact elements are pre-formed during substrate fabrication before the actual device assembly. This preliminary action prepares all connection points in advance, allowing devices with numerous input and output connections to be connected efficiently without requiring complex bonding operations during assembly.
2Reliability
If conventional bonding techniques are used for connecting substrates in applications like digital cameras and biometric devices, then connectivity is established, but the mechanical protection and structural integrity are insufficient
Solution Approach 1:
The substrate is segmented into distinct functional regions including a first region with contact elements for device mounting, a second region with exposed traces for cable connection, and intermediate connecting traces. This segmentation allows each region to be optimized for its specific function while maintaining overall structural integrity and mechanical protection.
Solution Approach 2:
Different regions of the substrate are given different properties: the first region is designed for mechanical support and device mounting, the intermediate region provides electrical connection, and the second region facilitates flexible cable attachment. This local differentiation enhances mechanical protection where needed while maintaining ease of manufacture through standardized fabrication processes.
3Productivity
If the substrate provides adequate connectivity for complex devices with numerous connections, then routing density increases, but the substrate structure becomes more complex
Solution Approach 1:
The substrate utilizes a planar two-dimensional structure with conductive traces distributed across the surface, allowing multiple connection paths to be routed simultaneously without increasing vertical complexity. This dimensional approach enables high routing density by utilizing the surface area efficiently while maintaining a relatively simple overall substrate structure.
Data Source
AI summary
Substrates having integrated rigid and flexible regions and methods of fabricating such substrates are disclosed. The substrates may advantageously be used for mounting semiconductor chips used in flexible microelectronic assemblies.