Variable Density Fiber Adhesive for Display Bending Stress
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Solution Overview
Problem
Display devices, such as LCDs and OLEDs, face damage from external stresses like bending, which can lead to compression stress and potential window damage, and existing technologies do not effectively mitigate these issues.
Innovation Solution
A display device with an adhesive layer containing a pressure-sensitive adhesive impregnated with fibers, where the fiber density varies based on position to provide specific elasticities, reducing compression stress and protecting the display module when bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a window is disposed on the display module to protect it, then the display module is protected from external damage, but compression stress occurs when the display device is bent
Solution Approach 1:
The adhesive layer has different fiber densities at different locations: higher fiber density in the first region (corresponding to folding part) and lower fiber density in the second region (corresponding to flat part). This local variation in material properties allows the adhesive layer to provide different levels of stress resistance and flexibility at different locations, effectively managing compression stress while maintaining protection.
Solution Approach 2:
The adhesive layer is formed as a composite material combining a pressure-sensitive adhesive with fibers. This composite structure provides both the adhesive bonding function and the mechanical reinforcement needed to resist compression stress, while the fiber distribution can be optimized for different functional regions.
2Strength
If the adhesive layer has high fiber density to reduce compression stress, then stress resistance is improved, but the adhesive layer becomes less flexible
Solution Approach 1:
The adhesive layer implements spatially varying fiber density to balance strength and flexibility requirements. The first region has higher fiber density for stress resistance, while the second region has lower fiber density for flexibility, allowing the same adhesive layer to satisfy both contradictory requirements in different locations.
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 varying fiber density in the adhesive layer effectively protects the display module by distributing stress and preventing deformation, enhancing the durability and surface hardness of the device while alleviating compression stress during bending.
Implementation Method 1
a density of the fiber in the adhesive layer is predetermined based on a position thereof in the impregnation region or a part of the display device corresponding thereto
Data Source
AI summary
A display device includes: a display module; a window disposed on the display module; and an adhesive layer disposed between the display module and the window, where the adhesive layer includes a pressure sensitive adhesive including an impregnation region impregnated with a fiber, and a density of the fiber in the adhesive layer is predetermined based on a position thereof in the impregnation region or a part of the display device corresponding thereto.