Patterned Adhesive Layer for Flexible Display Stress Relief
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Solution Overview
Problem
Flexible displays face challenges in handling and stress relief during folding due to the application of adhesive materials, which can cause tensile and pressure stress on the flexible substrate when bent.
Innovation Solution
A flexible display design featuring an adhesive layer with patterns and pattern gaps between them, allowing the adhesive material to disperse stress and reduce tension on the substrate during bending, while a protection film is applied over the flexible substrate with similar patterns and gaps to enhance durability and stress relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive material is applied continuously between the flexible substrate and protection film, then bonding strength is improved, but stress concentration during folding increases
Solution Approach 1:
The adhesive layer is divided into multiple discrete adhesive patterns (e.g., stripes, dots, or blocks) arranged in specific configurations rather than applying adhesive continuously. This segmentation allows the adhesive material to be distributed in a way that maintains bonding strength while creating gaps that prevent stress concentration during folding operations.
2Ease of operation
If flexible substrate is used instead of glass substrate, then flexibility and handling ease are improved, but stress resistance during folding deteriorates
Solution Approach 1:
The adhesive layer is designed with spatially varying properties through patterned arrangement, where adhesive material is concentrated in specific regions (adhesive patterns) and absent in others (gaps). This local quality variation allows the flexible substrate to bend more easily in gap regions while maintaining adequate bonding strength in adhesive pattern regions, thus resolving the contradiction between flexibility and stress resistance.
3Stress or pressure
If adhesive layer is made discontinuous with patterns, then stress relief during folding is improved, but bonding uniformity deteriorates
Solution Approach 1:
The adhesive patterns are designed with asymmetric or non-uniform arrangements (such as staggered stripes, irregular spacing, or varying pattern densities in different regions) that create stress relief pathways while maintaining adequate bonding. The asymmetric pattern design allows stress to be redirected through specific pathways rather than concentrating uniformly, achieving both stress relief and acceptable bonding uniformity.
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 design effectively reduces stress on the flexible substrate during bending by dispersing it through pattern gaps in the adhesive and protection films, improving the display's durability and flexibility.
Implementation Method 1
allowing for stress dispersion and relief during bending by creating pattern gaps that enable the adhesive material to stretch and reduce applied stress
Data Source
AI summary
A flexible display is disclosed. In one aspect, the display includes a flexible substrate and a protection film formed over the flexible substrate. The display further includes a layer of adhesive material formed between the flexible substrate and the protection film, wherein a plurality of patterns are formed in the adhesive layer.