Flexible Display Insulating Layer Openings for Bend Stress Relief
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Solution Overview
Problem
Flexible OLED displays face stress issues when bent, which can lead to damage to the insulating layer and constituent elements, particularly when using brittle inorganic materials.
Innovation Solution
Incorporating a first opening pattern in the insulating layer that extends in a direction perpendicular to the bending direction of the flexible substrate, minimizing stress and preventing short circuits between pixel components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is bent, then the display device achieves flexibility and can be folded or curved, but stress is generated in the insulating layer which can lead to damage and short circuits
Solution Approach 1:
The insulating layer is divided into multiple separate insulating layers instead of a single continuous layer. Each insulating layer can independently accommodate stress during bending, preventing crack propagation and maintaining electrical isolation between conductive elements even when the flexible substrate is bent or folded.
Solution Approach 2:
The patent uses multiple thin insulating film layers that are designed to be flexible and adaptable to substrate deformation. These thin films can stretch and compress with the flexible substrate during bending while maintaining their insulating function, preventing stress concentration and damage.
2Reliability
If multiple insulating layers are used to reduce stress, then reliability is improved, but device complexity increases
Solution Approach 1:
Each insulating layer serves multiple functions: providing electrical isolation between conductive elements, accommodating stress during bending, and preventing short circuits. This multi-functionality justifies the increased layer count by consolidating multiple protective and functional roles into each layer, reducing the need for additional specialized components.
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a flexible substrate capable of being bent in a first direction and an insulating layer including a first opening pattern positioned on the flexible substrate and extending in a second direction crossing the first direction.