Self-Healing Polymer Encapsulation for Flexible OLED Displays
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Solution Overview
Problem
Existing flexible OLED display panels face reduced flexibility and functional failure due to mechanical damage-induced cracks in multilayer encapsulation structures, which allow water vapor permeation and affect electro-optical properties.
Innovation Solution
Incorporating a self-healing layer made of self-healing polymer materials, such as microcapsule-based, hollow fiber-based, nanoparticle-based, microvascular-based, or carbon nanotube-based materials, into the buffer and thin film encapsulation layers to automatically heal cracks and enhance water-oxygen resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inorganic layer is bent to cover the border of the organic layer during deposition, then water vapor permeation is prevented, but mechanical damage (cracks) occurs after long-term repeated bending
Solution Approach 1:
The patent uses composite materials by combining organic and inorganic layers in a multilayer encapsulation structure. The organic layer provides flexibility and crack resistance, while the inorganic layer provides barrier properties against water vapor permeation. This composite approach allows the encapsulation structure to maintain both encapsulation effectiveness and mechanical durability under repeated bending.
2Reliability
If multilayer encapsulation structures are used to prevent water vapor permeation, then encapsulation quality is improved, but flexibility is reduced due to cracks
Solution Approach 1:
The patent employs thin film encapsulation where the organic layers serve as flexible components that can withstand repeated bending without cracking. These flexible organic layers are alternatingly deposited with inorganic barrier layers to create a multilayer structure that maintains both high encapsulation quality and flexibility, allowing the display panel to be bent without compromising the integrity of the encapsulation.
3Reliability
If cracks occur in the encapsulation structure, then water vapor permeation increases, but the device complexity increases to prevent and repair cracks
Solution Approach 1:
The patent implements a self-healing mechanism where the organic layers are designed to automatically close and seal cracks when they occur during repeated bending. The material properties of the organic layers allow them to deform and seal cracks without external intervention, maintaining the encapsulation's barrier function against water vapor permeation. This self-service approach prevents functional failure without adding complex external repair mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The self-healing layers effectively prevent water vapor ingress, maintain display effectiveness, and extend the lifespan of flexible OLED display panels by automatically repairing microcracks, thereby ensuring the integrity and functionality of the device.
Implementation Method 1
At least one of the buffer layer and the thin film encapsulation layer includes a self-healing layer comprising a self-healing polymer material
Data Source
AI summary
A flexible display device and fabrication method thereof are provided. The flexible display device includes a flexible substrate, a buffer layer disposed on the flexible substrate, a display unit disposed on the buffer layer covering a part of the buffer layer, and a thin film encapsulation layer disposed on the display unit and a rest part of the buffer layer. At least one of the buffer layer and the thin film encapsulation layer includes a self-healing layer comprising a self-healing polymer material.