Flexible Display Insulating Film Groove Segmentation

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Solution Overview

Problem

Conventional bendable organic electroluminescence display devices face issues with cracks and peeling in inorganic insulating films when the bending radius is small, leading to moisture and oxygen ingress, which deteriorates the light-emitting elements and reduces the reliability of the display.

Innovation Solution

The use of a substrate with a flexible inorganic insulating film divided by groove parts, filled with a softer silicon-containing film such as polysiloxane or polysilazane, to alleviate stress concentration and prevent moisture and oxygen ingress, thereby enhancing the reliability of the display device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an inorganic insulating film is used in a bendable display device, then moisture and oxygen barrier properties are improved, but cracks and peeling occur when the bending radius is small

Engineering Contradiction:

Improvemoisture and oxygen barrier propertiesVSAvoidresistance to cracks and peeling during bending

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The inorganic insulating film is divided into multiple regions by groove parts, creating segmented structures that can independently deform during bending. This segmentation prevents continuous stress propagation that would cause cracks and peeling across the entire film.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the insulating film structure are given different properties: the groove parts provide flexibility and stress relief zones, while the inorganic insulating film regions maintain moisture and oxygen barrier properties. This local differentiation allows simultaneous achievement of flexibility and protection.

Inventive Principle:

Principle #3Local quality

2Reliability

If the inorganic insulating film is made continuous to improve barrier properties, then moisture and oxygen ingress is prevented, but stress concentration occurs during bending

Engineering Contradiction:

Improveprotection against moisture and oxygen ingressVSAvoidstress concentration during bending

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The continuous inorganic insulating film is segmented by groove parts into discrete regions. This segmentation interrupts stress propagation paths during bending, preventing stress concentration while maintaining barrier properties through the distributed inorganic film regions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The groove parts act as intermediary elements between adjacent inorganic insulating film regions. These groove parts absorb and distribute mechanical stress during bending, preventing stress concentration on the brittle inorganic film while maintaining the overall barrier structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10910453B2Display device

Publication Date: 2021.02.02 MAGNOLIA WHITE CORP

AI summary

A display device includes a substrate including flexibility, a first inorganic insulating film having silicon and at least one of nitrogen and oxygen arranged above the substrate, a first groove part arranged so as to divide the first inorganic insulating film, a first silicon contained film filled into the first groove part, and a pixel electrode arranged to overlap a region surrounded by the first groove part. The first silicon contained film includes polysiloxane or polysilazane.