Flexible Display Panel Wire Stress Management
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Solution Overview
Problem
Flexible display panels face issues with wires cracking or breaking in the bending area, leading to poor electrical conductivity due to stress concentration and mismatched stress release in the functional film layers.
Innovation Solution
A flexible display panel design featuring a flexible substrate with an adjustment layer, a protective layer, and a planarization layer, where the protective layer corresponds to the wires in the bending area, forming an interface to release bending stress and reduce stress concentration, and optionally including a passivation layer to share stress evenly across the wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the bending area is bent to increase screen-to-body ratio, then the flexibility and compactness of the display apparatus are improved, but the wires in the bending area are subjected to bending stress and are prone to cracking or breaking
Solution Approach 1:
The patent divides the protective structure into multiple functional layers: a protective layer covering the wires, an adjustment layer between the protective layer and flexible substrate, and a stress release structure. This segmentation allows each layer to perform its specific function - the protective layer shields wires, the adjustment layer modulates stress, and the stress release structure prevents crack propagation, thereby maintaining wire reliability during bending
Solution Approach 2:
The adjustment layer acts as an intermediary between the protective layer and the flexible substrate. It has different mechanical properties from both the protective layer and the substrate, serving as a buffer that releases bending stress and prevents direct stress transmission to the wires, thus protecting wire conductivity while enabling flexibility
2Reliability
If the protective layer covers a large area to protect wires, then the protection effect is improved, but the stress concentration increases when the bending area is bent
Solution Approach 1:
The patent implements local quality by making the protective layer's coverage area correspond precisely to the wire locations in the bending area, rather than providing uniform comprehensive coverage. The adjustment layer is configured with specific thickness variations in different regions, and the stress release structure is positioned at critical stress points, allowing targeted stress management where needed while maintaining overall protection
Solution Approach 2:
The protective system is segmented into the protective layer, adjustment layer, and stress release structure, with each component having specific spatial distribution and functional characteristics. This segmentation allows stress to be managed locally at different levels rather than uniformly across the entire structure, reducing stress concentration while maintaining protection
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
This design reduces the occurrence of cracks or breaks in the wires, maintaining the conductive function and allowing for efficient stress release, thereby enhancing the durability and reliability of flexible display panels.
Implementation Method 1
when the bending area is bent, a bending stress is released through an interface between the adjustment layer and the protective layer, so as to relieve the stress that the protective layer bears when the bending area is bent
Data Source
AI summary
Included are flexible display panels, manufacturing methods thereof and flexible display apparatuses, which are used to solve the problem of poor conductive function of wires in a bending area. The flexible display panel includes a display area and a bending area located around the display area, where the bending area includes: a flexible substrate; an adjustment layer covering the entire flexible substrate; a protective layer located on the adjustment layer; a plurality of wires located on the protective layer; and a planarization layer located above the wires and covering a functional film layer on the flexible substrate; where the protective layer corresponds to the wires in the bending area, and an orthographic projection of the wires in the bending area on the flexible substrate falls into an orthographic projection of the protective layer on the flexible substrate.