Flexible Display Panel Lateral Barrier Structure
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Solution Overview
Problem
Flexible display panels face reliability issues due to water and oxygen permeation along the edges after cutting, which affects the lifespan of the panel's circuit and light-emitting material.
Innovation Solution
A method involving a composite substrate structure with a first polyimide layer, a water-oxygen barrier layer, and a protective layer, where the protective layer extends from the laser cut line to cover the panel area and edge area, preventing water and oxygen from permeating into the second polyimide layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water-oxygen barrier layer is deposited on the first polyimide layer to block water/oxygen permeation from the bottom, then the barrier property from the bottom is improved, but water/oxygen will permeate along the lateral side near the laser cut line, affecting reliability
Solution Approach 1:
The patent extends the protection from a single bottom layer to a three-dimensional structure by adding a protective layer that covers the lateral sides. This dimensional extension blocks water and oxygen permeation paths along the cut edges, solving the problem of lateral permeation that the bottom barrier layer alone cannot prevent.
Solution Approach 2:
The patent creates a composite protective structure combining the first polyimide layer, water-oxygen barrier layer, and second polyimide layer with lateral coverage. This multi-layer composite approach provides comprehensive protection against water and oxygen permeation from both bottom and lateral directions, enhancing overall reliability.
2Reliability
If the protective layer thickness is increased to improve barrier performance, then water and oxygen permeation is better blocked, but the flexibility and shaping capability of the display panel may be compromised
Solution Approach 1:
The patent optimizes the thickness parameter of the protective layer to achieve a balance between barrier performance and flexibility. By carefully controlling the thickness within a specific range, the structure provides effective water and oxygen protection while maintaining the necessary flexibility for shaping and conformal mounting applications.
Solution Approach 2:
The patent uses thin film structures for the protective layers that provide barrier functionality while maintaining flexibility. These thin film designs allow the display panel to be shaped and conform to different surfaces without compromising the protective function, resolving the contradiction between protection and adaptability.
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 solution significantly enhances the water and oxygen barrier properties of the flexible display panel, reducing the likelihood of damage and improving its service lifespan by effectively blocking permeation through the flexible base substrate.
Implementation Method 1
the water-oxygen barrier layer 102 is configured to block water/oxygen permeation from a bottom of the second polyimide layer 101b
Implementation Method 2
the protective layer extends from the laser cut line to the panel area and the panel edge area respectively... covering a partial lateral side of the second polyimide layer at the laser cut line and a lateral side of the water-oxygen barrier layer at the laser cut line
Data Source
AI summary
A flexible display panel and a preparation method thereof are provided. A composite substrate structure composed of a first polyimide layer, a water-oxygen barrier layer, a protective layer, and a second polyimide layer is prepared, and the protective layer covers a partial lateral side of the second polyimide layer in a non-display area and a lateral side of the water-oxygen barrier layer in the non-display area. Thus, the water and oxygen barrier property of the composite substrate structure is improved.