Flexible Display Panel Conductive Layer Stress Management
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Solution Overview
Problem
Flexible display panels face wear and damage due to repeated folding and unfolding, along with stress differences between materials, leading to performance degradation and increased fatigue.
Innovation Solution
A flexible display panel design featuring a substrate with a conductive layer between flexible substrate layers, a transistor, and an electro-optical active layer, including barrier layers and a buffer layer to prevent damage and fatigue, with a conductive layer providing sheet resistance between 10^6 and 10^9 Ω/m2 to manage static electricity effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display panel is repeatedly folded and unfolded, then the display can be made portable and versatile, but wear increases causing fatigue and damage
Solution Approach 1:
A buffer layer is introduced between the substrate and the transistor to provide cushioning and stress relief before damage occurs. This buffer layer absorbs mechanical stress during repeated folding and unfolding operations, preventing direct transmission of stress to the transistor and other sensitive components, thereby maintaining device reliability while enabling flexible portability.
Solution Approach 2:
The display panel employs a composite structure combining multiple materials with different mechanical properties. The substrate uses flexible materials that can withstand bending, while the buffer layer and barrier layers use materials specifically selected for their stress-absorption and protection capabilities. This composite approach allows the device to be both flexible enough for portability and durable enough to resist fatigue from repeated folding.
2Adaptability or versatility
If different materials are used for underlying layers, then functional requirements are met, but stress difference occurs degrading device performance
Solution Approach 1:
A buffer layer is positioned between the substrate and the transistor to act as an intermediary that mediates stress distribution. This buffer layer has mechanical properties that bridge the gap between the flexible substrate and the more rigid transistor components, reducing stress concentration and preventing degradation caused by mismatched thermal and mechanical expansion coefficients of different materials.
3Reliability
If a conductive layer is added to manage static electricity, then electrical protection is improved, but device complexity increases
Solution Approach 1:
The buffer layer is designed to serve multiple functions simultaneously: it provides mechanical cushioning to reduce stress on the transistor, acts as a barrier layer to protect against environmental factors, and functions as a conductive layer to manage static electricity. By integrating these multiple protective functions into a single layer, the design achieves comprehensive electrical and mechanical protection without proportionally increasing device complexity.
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 effectively prevents product failure and damage by minimizing stress and static electricity issues, maintaining performance even with repeated folding and unfolding, thus enhancing the durability and usability of flexible displays.
Implementation Method 1
the conductive layer can have sheer resistance of a range between 106 and 109 Ω/m2
Data Source
AI summary
A flexible display panel is disclosed. In one aspect, the panel includes a substrate including a flexible first substrate layer, a flexible second substrate layer, and a conductive layer interposed between the flexible first and second substrate layers. The panel also includes a transistor provided over the substrate, and an electro-optical active layer provided over the transistor.