Bonding Layer Discrete Patches Flexible Display Stress
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Solution Overview
Problem
Flexible displays face challenges in maintaining adequate bonding strength and minimizing bending stress when subjected to bending or folding, particularly due to the fragility of adjacent layers such as thin film transistors and conductive traces in OLEDs, which are prone to damage under critical stress or strain.
Innovation Solution
A bonding layer with a support layer and discrete adhesive patches on opposing surfaces, designed to provide shear mobility and reduce bending stress, featuring a low shear modulus and glass transition temperature outside the operating range, ensuring minimal stress transmission to adjacent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a continuous adhesive layer is used to bond layers in a flexible display, then bonding strength is improved, but bending stress and strain increase, causing damage to fragile adjacent layers
Solution Approach 1:
The continuous adhesive layer is segmented into discrete adhesive patches distributed across the bonding layer. This segmentation allows the bonding layer to flex and bend without transmitting excessive stress to adjacent fragile layers, while still providing adequate bonding strength through the distributed patches. The gaps between patches create compliance that absorbs bending strain.
Solution Approach 2:
The bonding layer exhibits different properties in different regions: discrete adhesive patches provide localized bonding strength at specific contact points, while the surrounding non-adhesive regions provide compliance and stress relief during bending. This spatial variation in adhesive distribution optimizes both bonding and flexibility.
2Strength
If adhesive patches are made larger or more numerous to improve bonding strength, then bonding strength is improved, but the complexity of the bonding layer structure increases
Solution Approach 1:
The adhesive patches cover only a portion of the bonding layer surface rather than the entire area. This partial coverage is sufficient to provide adequate bonding strength while simplifying the overall structure compared to a continuous adhesive layer. The discrete patches are easier to manufacture and align than a continuous adhesive coating.
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 bonding layer effectively reduces bending stress and strain in flexible displays, maintaining optical clarity and durability through the use of discrete adhesive patches and a soft elastomer support layer, enhancing the display's ability to withstand repeated bending and folding without damaging adjacent fragile layers.
Implementation Method 1
The bonding layer has a low shear modulus and glass transition temperature outside the operating range
Implementation Method 2
The bonding layer has a low shear modulus and glass transition temperature outside the operating range
Implementation Method 3
The bonding layer effectively reduces bending stress and strain in flexible displays
Implementation Method 4
The bonding layer comprises a support layer, a first set of discrete adhesive patches, and a second set of discrete adhesive patches
Data Source
AI summary
At least some aspects of the present disclosure feature a bonding layer including a support layer and discrete adhesive patches disposed on one or both sides of the support layer. At least some aspects of the present disclosure feature a flexible display using a bonding layer including discrete adhesive patches.