Flexible Base Substrate Composite Structure Water Oxygen Barrier
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Solution Overview
Problem
Flexible display panels using resin substrates are susceptible to water and oxygen intrusion, which affects the reliability and lifespan of the panel, as existing water-oxygen barrier layers are not effective in preventing permeation along the edges after cutting.
Innovation Solution
A flexible base substrate with a composite structure comprising a first polyimide layer, a water-oxygen barrier layer, and a protective layer, where the protective layer is made of silicon oxide, silicon nitride, or amorphous silicon, and a second polyimide layer, which extends the permeation path of water and oxygen, thereby enhancing the barrier properties and flexibility of the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible resin substrates are used to achieve desired shaping and high surface flatness, then flexibility and surface quality are improved, but resin materials are susceptible to intrusions of oxygen and water, affecting panel reliability
Solution Approach 1:
The patent creates a composite structure by combining the flexible polyimide resin substrate with inorganic water-oxygen barrier layers (such as aluminum oxide, silicon oxide, or silicon nitride). This composite construction maintains the flexibility and surface flatness of the resin while adding robust protection against water and oxygen intrusion through the inorganic barrier layers.
Solution Approach 2:
The patent employs flexible thin film barrier layers that are deposited on the resin substrate. These thin films provide effective protection against water and oxygen while conforming to the flexible nature of the resin substrate, enabling the display panel to maintain both flexibility and reliability.
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 composite substrate structure significantly reduces water and oxygen permeation, improving the reliability and lifespan of flexible display panels by effectively blocking intrusions and maintaining flexibility for wide-ranging applications.
Implementation Method 1
a protective layer disposed on the water-oxygen barrier layer in the panel area and near the laser cut line; wherein a material of the protective layer comprises at least one of silicon oxide, silicon nitride, and amorphous silicon
Implementation Method 2
a water-oxygen barrier layer covering the first polyimide layer; the water-oxygen barrier layer is configured to block water/oxygen permeation from a bottom of the second polyimide layer
Data Source
AI summary
A flexible base substrate, a flexible display panel, and a method for preparing the same are provided. By preparing a composite substrate structure composed of a first polyimide layer, a water-oxygen barrier layer, a protective layer, and a second polyimide layer, the prepared flexible display panel has desired water and oxygen barrier property, thereby greatly reducing the probability of water and oxygen passing through the flexible base substrate, and improving the service lifespan of the flexible display panel.