Flexible Display Lead Wire Hollow Patterns for Stress Relief

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Flexible display panels face issues with lead wire breakage in bent regions due to stress accumulation, especially as the radius of curvature decreases, leading to degradation or failure of the panel.

Innovation Solution

Incorporating hollow patterns in the lead wires within the bent region, which dissipate stress and prevent breakage by releasing it during bending, with the arrangement density of sub-patterns adjusted based on the radius of curvature to manage stress effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the radius of curvature of the bent region is reduced to achieve a more compact flexible display panel, then the compactness and flexibility are improved, but the lead wires become more easily broken due to increased stress accumulation

Engineering Contradiction:

Improvecompactness of flexible display panelVSAvoidlead wire integrity

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The lead wire is segmented into multiple sections by introducing hollow patterns that divide the continuous lead wire structure into discrete segments. This segmentation allows stress to be distributed across multiple sections rather than concentrated in a single continuous path, preventing crack propagation and wire breakage during bending operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Hollow patterns are introduced into the lead wire structure, creating a porous or cavity-containing design. These hollow regions act as stress relief zones that can deform elastically during bending, absorbing mechanical stress and preventing the lead wire from breaking while maintaining electrical conductivity through the remaining material structure.

Inventive Principle:

Principle #31Porous materials

2Shape

If the radius of curvature of the bent region is reduced to achieve a tighter bend, then the flexibility and narrow frame design are improved, but the stress on lead wires increases causing easier breakage

Engineering Contradiction:

Improvebend radiusVSAvoidlead wire strength

Core Design Contradiction:

ShapeVSStrength

Solution Approach 1:

Hollow patterns are pre-introduced into the lead wire structure in advance of any bending operation. These hollow regions serve as pre-positioned cushioning zones that can absorb and distribute mechanical stress during subsequent bending, protecting the lead wire from breakage before stress accumulation becomes critical.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The physical structure of the lead wire is changed by introducing hollow patterns, which modifies its mechanical properties. This structural parameter change allows the lead wire to better withstand bending stresses by providing stress relief pathways while maintaining electrical functionality.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11026323B2Flexible display panel, display device and manufacturing method thereof

Publication Date: 2021.06.01 BOE TECHNOLOGY GROUP CO LTD

AI summary

A flexible display panel, a display device and a manufacturing thereof are disclosed. Hollow patterns are arranged in the lead wires in the bent region of the flexible display panel between the display region and the binding region. The hollow patterns can dissipate the stress accumulated on the lead wires during the bending and help the lead wires to release the stress when they are bent, thereby preventing breakage of the lead wires and improving the quality and reliability of the flexible display panel.