Flexible Electronic Structure With Neutral-Plane Interconnections

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Solution Overview

Problem

Existing flexible electronic structures face issues with mechanical stress and structural integrity due to bending and torsional stresses, particularly when integrating commercially available components that are not ultra-thin, leading to weakened bonding and reduced lifespan.

Innovation Solution

A flexible electronic structure design with a neutral plane positioning interconnecting elements and compensation layers to minimize mechanical stress, using multiple polymer or glass films with controlled thickness and Young's modulus, and discrete compensation layers to maintain structural integrity during bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If commercially available electronic components are integrated into flexible structures, then component functionality and availability are improved, but bonding integrity and structure lifespan deteriorate due to bending stresses

Engineering Contradiction:

Improvecomponent availabilityVSAvoidbonding integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent positions interconnecting elements at the neutral plane (central dimension) of the flexible structure rather than at the surfaces, transitioning from two-dimensional surface mounting to three-dimensional spatial optimization. This dimensional change places connections at the location of minimal mechanical stress during bending, resolving the contradiction between using standard components and maintaining bonding integrity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The patent applies different material properties and structural characteristics to different regions of the flexible structure. The interconnecting elements at the neutral plane have specific mechanical properties optimized for stress resistance, while surface regions accommodate component functionality. This local differentiation allows standard components to be used while protecting critical bonding interfaces.

Inventive Principle:

Principle #3Local quality

2Reliability

If interconnecting elements are placed at the neutral plane, then resistance to bending stresses is improved, but manufacturing complexity increases

Engineering Contradiction:

Improvestress resistanceVSAvoidmanufacturing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the flexible structure into distinct functional layers: surface regions for component integration and a central neutral plane region for interconnecting elements. This segmentation allows independent optimization of each region's manufacturing process, reducing overall complexity despite the three-dimensional architecture.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The neutral plane acts as an intermediary layer between the surface components and the flexible substrate. This intermediate structure simplifies manufacturing by providing a dedicated plane for interconnections that is mechanically decoupled from surface mounting processes, allowing sequential fabrication steps.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If discrete compensation layers are added to counteract bending stresses, then bonding integrity is improved, but structural complexity and manufacturing steps increase

Engineering Contradiction:

Improvebonding integrityVSAvoidstructural complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the compensation function into the existing multi-layer flexible structure by positioning interconnecting elements at the neutral plane. Rather than adding separate compensation layers, the structural design itself provides stress compensation, reducing complexity through functional integration.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The neutral plane configuration enables the structure to self-compensate for bending stresses through its inherent geometry. The central positioning of interconnecting elements automatically places them at the location of minimal stress during flexing, eliminating the need for additional active compensation mechanisms.

Inventive Principle:

Principle #25Self-service

Data Source

PatentEP3811744B1Flexible electronique structure and manufacturing process therefore

Publication Date: 2025.12.10 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

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Figure 9~11D

AI summary

The invention relates to a flexible electronic structure (100) comprising: - a first film (101), made of a first polymer or glass, - a second film (102), made of a second polymer, in which at least one electronic component (300) is arranged, the second film (102) covering the first film (101), - at least one electrically conductive track (200) arranged between the first film (101) and the second film (102), and each electrically connected to one of the electronic components (300), by a respective interconnection element (400), and - optionally a third film (103), made of a third polymer or glass, covering the second film (102). The interconnection element (400) is arranged near the neutral plane of the structure (100), and the structure comprises at least one compensation layer (500), so as to position the neutral plane at a desired location.