Flexible Display Adhesive Thickness for Delamination Prevention
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Solution Overview
Problem
Flexible display devices face delamination issues when folded or subjected to external impacts due to stress and damage from curvature, leading to reduced reliability and increased risk of separation and damage.
Innovation Solution
A flexible display device design incorporating multiple functional layers with specific thickness ranges and adhesive members, including an impact-absorbing layer, polarizing layer, and protective layers, along with a cushion layer and support member, to absorb impacts and prevent separation, with adhesive layers totaling between 135 μm and 200 μm in thickness and a thickness deviation of less than 30%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If flexible display devices are folded or curved, then portability and user convenience are improved, but components delaminate from each other due to stress
Solution Approach 1:
The patent applies beforehand cushioning by introducing a cushion layer between the flexible display panel and the back cover, and by designing adhesive members with specific thickness ranges (135-200 μm total) to absorb stress before it reaches critical levels. This preventive approach ensures components remain adhered during folding operations without requiring reactive measures after delamination occurs.
Solution Approach 2:
The patent utilizes parameter changes by specifying precise thickness parameters for adhesive members (135-200 μm total thickness, with the thickest adhesive being no more than 1.3 times the thinnest) and functional layers (35-60 μm each). These controlled parameter variations optimize the balance between flexibility for folding and structural integrity to prevent delamination.
2Reliability
If flexible display devices are subjected to external impact, then durability is tested, but the flexible display panel is damaged
Solution Approach 1:
The patent implements beforehand cushioning by placing a cushion layer between the flexible display panel and back cover, and by designing an impact-absorbing functional layer that proactively absorbs impact energy before it can damage the display panel. This preventive cushioning structure protects the panel during external impacts without requiring post-damage repair.
Solution Approach 2:
The patent applies blessing in disguise by converting the harmful impact force into beneficial stress distribution through the cushion layer and impact-absorbing functional layer. These layers transform the concentrated impact energy into distributed mechanical stress that the structure can withstand, thereby protecting the flexible display panel from damage while maintaining overall device integrity.
3Reliability
If adhesive member thickness is increased to prevent separation, then component adhesion is improved, but device flexibility and folding capability are reduced
Solution Approach 1:
The patent resolves this contradiction through precise parameter changes by specifying that the total thickness of adhesive members should be between 135-200 μm, with the thickest adhesive member being no more than 1.3 times the thinnest. This controlled thickness range provides sufficient adhesion strength to prevent separation while maintaining flexibility for folding operations.
Solution Approach 2:
The patent applies local quality by distributing multiple adhesive members with varying thicknesses at different locations rather than using a uniform thick adhesive layer. This localized variation in adhesive thickness provides targeted reinforcement where needed while preserving overall flexibility in regions requiring bending capability.
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 separation and enhances the device's resistance to external impacts, ensuring improved reliability and durability during folding and usage.
Implementation Method 1
a plurality of adhesive members each being between the functional layers or between one functional layer among the functional layers and the flexible display panel
Implementation Method 2
The functional layers include an impact-absorbing functional layer to absorb an impact applied thereto
Implementation Method 3
The display device further includes a cushion layer under the flexible display panel to absorb an impact applied thereto
Data Source
AI summary
A display device includes a flexible display panel, a plurality of functional layers above the flexible display panel, and a plurality of adhesive members each being between respective ones of the functional layers or between one functional layer among the functional layers and the flexible display panel. A sum of thicknesses of the adhesive members is equal to or greater than about 135 micrometers (μm) and equal to or less than about 200 micrometers (μm), and the thickness of the adhesive member having the largest thickness among the adhesive members is equal to or less than about 1.3 times the thickness of the adhesive member having the smallest thickness among the adhesive members.