Flexible Substrate With Segmented Insulating Basement
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Solution Overview
Problem
Flexible substrates with electrical elements face challenges in preventing wiring damage due to stress caused by flexing and stretching, which existing measures such as honeycomb-shaped openings and meandering wiring shapes do not adequately address.
Innovation Solution
A flexible substrate design featuring an insulating basement with line portions supporting wiring lines and island-shaped portions supporting electrical elements, where the wiring lines and electrical elements are located between the insulating basement and a metal layer, enhancing protection against stress-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wiring lines are formed in a meandering shape to reduce stress, then flexibility is improved, but wiring line length increases causing higher resistance and signal loss
Solution Approach 1:
The insulating basement is segmented into multiple line portions and island-shaped portions, creating a modular structure that supports wiring lines while reducing overall stress accumulation. This segmentation allows the wiring to maintain shorter effective paths while still accommodating flexing through the distributed modular architecture.
Solution Approach 2:
The patent introduces a vertical dimension by stacking multiple insulating basements and metal layers in a layered structure. This multi-layer configuration allows wiring lines to be positioned at different heights, reducing the need for long meandering paths while maintaining flexibility through the layered architecture.
2Strength
If a rigid basement structure is used to support wiring lines, then structural strength is improved, but flexibility and elasticity deteriorate
Solution Approach 1:
The insulating basement is designed as a thin-film structure with integrated line portions and island-shaped portions that provide mechanical support while maintaining flexibility. This thin-film approach replaces rigid bulk structures with flexible membrane-like components that can accommodate bending and stretching.
Solution Approach 2:
By dividing the basement into discrete line portions and island-shaped portions connected by flexible regions, the structure gains both local strength where needed and overall flexibility through the segmented architecture that can deform independently in different zones.
3Productivity
If wiring lines are placed close to electrical elements to reduce connection length, then signal transmission is improved, but vulnerability to stress-induced damage increases
Solution Approach 1:
The patent utilizes vertical stacking to position wiring lines and electrical elements in different layers, reducing the horizontal distance between them while maintaining stress resistance. The multi-layer configuration allows short connection paths through vertical vias rather than long horizontal traces, achieving both signal efficiency and stress protection.
Solution Approach 2:
The insulating basement structure with its island-shaped portions and line portions is designed beforehand to absorb and distribute stress before it can reach the wiring lines and electrical elements. This pre-engineered stress distribution network protects closely-spaced components from stress-induced damage.
4Reliability
If multiple protective layers are added to protect electrical elements, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulating basement serves multiple functions simultaneously: it provides mechanical support, electrical insulation, stress distribution, and moisture barrier protection. By making the basement multi-functional rather than adding separate layers for each function, the design achieves comprehensive protection without proportionally increasing complexity.
Solution Approach 2:
The patent merges the support structure, insulation layer, and protective barrier into a single integrated insulating basement component with island-shaped portions and line portions. This consolidation combines multiple protective functions into one unified structure, reducing overall device complexity while maintaining comprehensive protection.
Data Source
AI summary
According to one embodiment, a flexible substrate includes an insulating basement, a plurality of wiring lines, a plurality of electrical elements connected to the plurality of wiring lines, and a metal layer. The insulating basement includes a plurality of line portions supporting the plurality of wiring lines, and a plurality of island-shaped portions supporting the plurality of electrical elements. The plurality of line portions connect the plurality of island-shaped portions. The plurality of wiring lines and the electrical elements are located between the insulating basement and the metal layer.