Segmented Adhesive Layers for Flexible Display Stress Relief
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Solution Overview
Problem
Flexible display devices face deformation and failure due to stress from bracket twisting when they fall, as existing designs do not adequately minimize stress on the display panel.
Innovation Solution
A display device design featuring a metal layer with specific adhesive layers on its surface, where the adhesive layers cover only a limited area, allowing for flexible deformation and reducing stress on the panel during impact, using materials with a Young's modulus of 0.1 MPa or less, such as acryl-based or silicon-based resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are disposed over the entire surface of the metal layer, then the bracket is strongly fixed to the display device, but stress is concentrated on the display panel during bracket twisting when the device falls
Solution Approach 1:
The adhesive layers are segmented into multiple separate adhesive regions distributed on the metal layer surface, rather than forming a continuous layer. This segmentation allows stress to be distributed across multiple discrete points during bracket twisting, preventing stress concentration on the display panel while maintaining sufficient overall adhesion strength
Solution Approach 2:
Different regions of the metal layer surface are treated differently: some regions have adhesive layers for strong fixation, while other regions (the exposed regions between adhesive regions) are left without adhesive to allow stress relief and deformation. This local differentiation enables simultaneous achievement of strong adhesion and stress minimization
2Stability of the object's composition
If the metal layer is made completely rigid to maintain structural stability, then the display device structure is stable, but deformation during impact cannot be absorbed, leading to panel failure
Solution Approach 1:
The exposed regions between adhesive regions change their mechanical parameters during impact - transitioning from a rigid fixed state to a flexible deformable state. These regions act as stress relief zones that can deform and absorb impact energy, preventing catastrophic failure of the display panel while the overall structure maintains stability through the adhesive regions
3Strength
If adhesive layers cover the entire metal layer surface, then maximum adhesion is achieved, but the metal layer cannot deform smoothly under stress during falls
Solution Approach 1:
The adhesive coverage is segmented into discrete regions rather than a continuous layer, creating exposed regions that serve as deformation zones. This segmentation allows the metal layer to deform smoothly in these exposed areas during falls and impacts, while the adhesive regions maintain necessary adhesion strength
Solution Approach 2:
The structure transitions from a static fully-adhered configuration to a dynamic system where exposed regions can deform under stress. The adhesive regions remain relatively fixed while the exposed regions dynamically adjust their shape and position during impact, enabling the metal layer to adapt to stress conditions
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 minimizes deformation and failure of the display device by allowing the adhesive layers to deform smoothly under stress, reducing strain on the display panel during falls and impacts.
Implementation Method 1
the adhesive layers to deform smoothly under stress, reducing strain on the display panel during falls and impacts
Data Source
AI summary
A display device includes: a display panel; a metal layer disposed on one surface of the display panel and including a first bending portion, and a first flat portion and a second flat portion disposed with the first bending portion interposed therebetween; a first adhesive layer including a first extended portion and a second extended portion disposed along the edge of the first flat portion of the metal layer; and a second adhesive layer disposed along the edge of the second flat portion of the metal layer, wherein the metal layer includes an exposed region in which the first adhesive layer and the second adhesive layer are not disposed, and the exposed region is disposed between the first extended portion and the second extended portion in the first flat portion.