Flexible Substrate Structure for Stress-Resistant Wiring

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Solution Overview

Problem

Flexible substrates with electric elements face damage from stress caused by flexing and stretching, necessitating measures to prevent wiring line damage.

Innovation Solution

A flexible substrate design featuring a honeycomb-shaped opening and meandering wiring lines, combined with a corrugated shape for the bridge and extending portions, and the use of organic and inorganic insulating layers to enhance flexibility and protect wiring.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a honeycomb-shaped opening is provided in the basement to prevent wiring line damage from stress, then the flexibility of the substrate is improved, but the structural strength is reduced

Engineering Contradiction:

ImproveflexibilityVSAvoidstructural strength

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The basement is divided into multiple island-shaped portions separated by honeycomb-shaped openings, allowing each segment to move independently during flexing while maintaining overall structural integrity through the bridge portions that connect them

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The bridge portions are formed with a corrugated shape featuring curved ridges and grooves, enabling the structure to flex and deform elastically under stress while maintaining strength, rather than using straight rigid connections

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If wiring lines are formed in a meandering shape to reduce stress concentration, then the reliability of wiring is improved, but the area occupied by the wiring increases

Engineering Contradiction:

Improvewiring reliabilityVSAvoidsubstrate area

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The wiring lines are formed with meandering curves instead of straight lines, allowing the wiring to follow the flexing motion of the substrate and distribute stress along the curved path, preventing breakage while fitting within the available area

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Ease of operation

If the bridge portion is formed with a corrugated shape to enhance flexibility, then the ease of operation is improved, but the manufacturing precision becomes more difficult to control

Engineering Contradiction:

ImproveflexibilityVSAvoiddimensional precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The bridge portion incorporates a corrugated structure with regular ridges and grooves that provides controlled flexibility - the periodic geometry allows predictable deformation behavior while maintaining manufacturability through standard fabrication processes

Inventive Principle:

Principle #14Spheroidality (Curvature)

4Reliability

If organic and inorganic insulating layers are used to protect wiring lines, then the reliability is improved, but the device complexity increases

Engineering Contradiction:

Improvewiring protectionVSAvoidlayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a composite insulating structure combining organic insulating layers (such as polyimide) and inorganic insulating layers (such as silicon oxide or silicon nitride), where each material type provides complementary protective functions - organic layers offer flexibility and moisture barrier properties while inorganic layers provide excellent electrical insulation and mechanical protection

Inventive Principle:

Principle #40Composite materials

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

The design improves the flexibility and reduces stress concentration, preventing wiring line breakage and enhancing the overall durability and reliability of the flexible substrate.

Implementation Method 1

use of organic and inorganic insulating layers to enhance flexibility and protect wiring

Methodology Applied

Scientific EffectMechanical support and insulation:

Implementation Method 2

providing a honeycomb-shaped opening in a basement which supports the wiring lines and forming the wiring lines in a shape of meandering

Methodology Applied

Scientific EffectStress distribution:

Implementation Method 3

the corrugated shape for the bridge and extending portions

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS12464911B2Flexible substrate and electronic device

Publication Date: 2025.11.04 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a flexible substrate includes a first insulating basement, which includes an island-shaped portion, a bridge portion, and an extending portion. The island-shaped portion includes a first island-shaped portion and a second island-shaped portion. The bridge portion extends in a first direction and connects the first island-shaped portion with the second island-shaped portion. The extending portion includes a first extending portion connected to the first island-shaped portion and extending in a second direction, and a second extending portion connected to the bridge portion and extending in the second direction.