Touch Module Bending Stress Segmentation

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Solution Overview

Problem

The poor bending ability of touch modules leads to breakage at the binding area when attached to cover plates with larger bending angles, resulting in failed touch functions.

Innovation Solution

A touch module design featuring a substrate with conductive bridges, insulating support portions, and touch electrode portions, where the insulating support portion includes first and second support portions separated by a first partition opening, allowing for stress release during bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the bending angle of the binding area is increased to 90° or larger, then the structural differentiation and consumer appeal are improved, but the touch module is likely to break at the binding area due to poor bending ability

Engineering Contradiction:

Improvebending angleVSAvoidtouch module integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The insulating support portion is divided into multiple separate support portions (first support portion, second support portion, third support portion) arranged in the first direction, with partition openings between them. This segmentation allows each support portion to independently accommodate bending stress, preventing stress concentration and reducing the likelihood of breakage at the binding area when the bending angle is increased.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insulating support portion has different structural characteristics at different locations: the first support portion has a first via hole for electrical connection, the second support portion is positioned between first support portions, and the third support portion has a second via hole. This local differentiation allows the structure to simultaneously provide electrical connectivity, mechanical support, and stress distribution at critical locations during bending.

Inventive Principle:

Principle #3Local quality

2Strength

If the insulating support portion is made continuous to provide uniform support, then the structural strength is improved, but the bending ability is reduced due to stress concentration

Engineering Contradiction:

Improveinsulating support strengthVSAvoidbending ability

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The insulating support portion is segmented into multiple separate support portions with partition openings between them. This segmentation prevents stress concentration by distributing bending stress across multiple independent regions, allowing the structure to maintain both strength and bending ability. The partition openings act as stress relief zones that prevent crack propagation.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The partition openings are pre-formed in the insulating support portion during manufacturing, creating stress relief zones before the bending operation. This preliminary action prevents stress concentration and crack initiation during subsequent bending, allowing the structure to withstand larger bending angles without failure.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12236051B2Touch module and display device

Publication Date: 2025.02.25 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A touch module comprises a substrate and at least one group of touch patterns formed on one side of the substrate, wherein each group of the touch patterns comprises a conductive bridge, an insulating support portion, and a touch electrode portion. The touch module has good bending capacity.