Flexible Touch Display Panel Crack-Resistant Electrode Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible touch display panels face challenges in integrating a touch function that remains functional when bent in various directions without sustaining damage from cracks, as existing solutions fail to adequately prevent crack propagation and maintain flexibility.
Innovation Solution
The implementation of a flexible touch display panel design featuring a touch film with serpentine-shaped conductive electrodes and a pattern of elongated narrow-width electrode strips extending in different directions, which prevents crack growth and enhances flexibility by incorporating crack-spread choke points and barriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is made flexible and bendable, then the portability and adaptability are improved, but cracks occur and spread when bent, reducing reliability
Solution Approach 1:
The electrode patterns are divided into multiple segments with connecting patterns that create serpentine-shaped conductive fingers. This segmentation allows the electrode structure to flex without continuous crack propagation, as cracks are stopped at the segmented boundaries while electrical connectivity is maintained through the serpentine paths.
Solution Approach 2:
The electrode patterns are designed with serpentine (curved) shapes instead of straight lines. These curved patterns absorb bending stresses and prevent linear crack growth by redirecting stress distribution along the curved paths, maintaining both flexibility and crack resistance.
2Reliability
If wide electrode patterns are used, then electrical conductivity is improved, but flexibility is reduced due to higher stiffness
Solution Approach 1:
Wide electrode patterns are segmented into multiple narrow strips with connecting patterns between them. This segmentation reduces the stiffness of individual electrode elements while maintaining overall electrical conductivity through the interconnected serpentine structure, enabling both good conductivity and flexibility.
Solution Approach 2:
The electrode patterns use serpentine (curved) geometries instead of straight wide lines. The curved shapes reduce the moment of inertia and stiffness of the electrode structures, allowing them to bend more easily while still providing sufficient electrical conductivity through the extended conductive paths.
Data Source
AI summary
The spread of nascent cracks through a flexible electrodes layer is blocked or impeded by patterning at least one of the electrodes to have crack-spread blocking boundaries and/or crack-spread impeding choke points, where the crack-spread blocking boundaries are placed to block linear growth of cracks and the crack-spread impeding choke points are placed and sized to serve as bottlenecks that impede linear growth of cracks through the corresponding electrode. Additionally, greater flexibility is provided by including a pattern of elongated strips of narrow width electrode material longitudinally extending in different directions, where the provided flexibility is greater than what it would be if a pattern of elongated narrow width electrode strips longitudinally extending in different directions was not provided. One example of crack-spread blocking boundaries and flexibility enhancing patterning is that of shaping each electrode to have serpentine fingers extending longitudinally in different directions. One example of crack-spread impeding choke points is that of shaping each electrode to have dose but spaced apart openings for example in a grid pattern.