Flexible Display Panel Wiring Layout for Bend Stress Resistance

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Solution Overview

Problem

The risk of wiring disconnection due to stress associated with bending is increased in flexible display panels, particularly when using inorganic insulating films that are susceptible to tensile stress during curvature.

Innovation Solution

The use of an organic insulating film to cover the wiring in flexible display panels, combined with a configuration that positions the wiring near the neutral plane of stress and avoids inorganic films in curved areas, reduces the risk of disconnection by mitigating tensile stress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an inorganic insulating film is used to cover the wiring, then the insulating performance is improved, but the wiring becomes susceptible to tensile stress during bending

Engineering Contradiction:

Improveinsulating performanceVSAvoidresistance to tensile stress

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the material parameter of the insulating film from inorganic to organic, specifically using an organic resin film that maintains insulating performance while possessing flexibility and resistance to tensile stress during bending operations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a flexible organic resin film instead of a rigid inorganic film to cover the wiring. This flexible film can accommodate bending stresses without cracking, thereby protecting the wiring while maintaining insulating properties

Inventive Principle:

Principle #30Flexible shells and thin films

2Adaptability or versatility

If the display panel is designed to be flexible with a resin film base material, then the adaptability is improved, but the risk of wiring disconnection increases

Engineering Contradiction:

ImproveflexibilityVSAvoidwiring connection reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent creates a composite structure where an organic resin film is applied over the wiring layer on the flexible base material. This composite approach combines the flexibility of the resin film base material with the protective and insulating properties of the organic resin film, allowing the display panel to bend without disconnecting the wiring

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic resin film acts as an intermediary layer between the flexible base material and the wiring. This intermediary layer protects the wiring from direct exposure to bending stresses while maintaining the overall flexibility of the display panel

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20250311607A1Flexible panel

Publication Date: 2025.10.02 MAGNOLIA WHITE CORP

AI summary

In a display device including a flexible display panel, the risk of disconnection of a wiring due to bending is reduced. A display panel includes a display function layer including display elements and a wiring on one major surface of a base material having flexibility. The display panel includes, on the one major surface of the base material, an organic-film-covered wiring area where the surface of the wiring is covered with an organic planarization film that is an organic insulating film in direct contact with the wiring. The display panel includes, in the plane thereof, a display area where the display elements are arranged and a component mounting area that is a peripheral area located outside the display area. As the organic-film-covered wiring area, a curved area is provided in the peripheral area.