Flexible Wiring Substrate Insulating Member Design

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Solution Overview

Problem

Flexible wiring substrates used in electro-optical devices face issues with wiring short-circuiting when coupled with silicon substrates, and the protective members used to prevent this can cause mounting failures due to thickness and affixing inaccuracies, leading to potential connection failures.

Innovation Solution

A flexible wiring substrate design featuring a base member with a wiring layer covered by a protective member and an insulating member that is thinner and partially overlaps the protective member, using a photosensitive resin or solder resist, which contacts the semiconductor substrate's corner to prevent short-circuiting and ensure accurate mounting.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the protective member is made thicker to ensure insulating properties, then wiring short-circuiting is prevented, but affixing accuracy decreases leading to mounting failure

Engineering Contradiction:

Improveinsulating propertiesVSAvoidaffixing accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The insulating function and positioning function are segmented into different members. The protective member provides thick insulation, while the insulating member provides precise positioning with minimal thickness, eliminating the trade-off between insulation and precision.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insulating member acts as an intermediary element between the protective member and the connection terminal portion. It provides the necessary positioning function without the thickness that would cause overlap and mounting failure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the exposed length of the connection portion is made longer to facilitate coupling, then mounting ease is improved, but the risk of wiring short-circuiting increases

Engineering Contradiction:

Improvecoupling facilitationVSAvoidwiring short-circuiting risk

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The insulating member serves as an intermediary that enables precise positioning during coupling while the protective member provides insulation. This allows for adequate exposed length for coupling without increasing short-circuit risk.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11291111B2Flexible wiring substrate, electro-optical device, and electronic apparatus

Publication Date: 2022.03.29 SEIKO EPSON CORP

AI summary

A flexible wiring substrate includes a main substrate having flexibility, a main wiring disposed over the main substrate, a second protective sheet covering the main wiring, and an insulating member partially covering the main wiring exposed from the second protective sheet and being thinner in thickness than the second protective sheet.