Flexible Display Support Substrate with Local Adhesion for Folding
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Solution Overview
Problem
Flexible displays face challenges in preventing the breakage of wiring lines in folded areas, which can reduce the reliability of the display device.
Innovation Solution
A display device design featuring a support substrate with a first and second flexible resinous substrate separated by an inorganic insulating barrier layer, where the second substrate overlaps the barrier layer with a reduced adhesion strength in a specific area to allow folding without damaging the metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the second resinous substrate adheres tightly to the first barrier layer throughout the entire structure, then structural strength is improved, but wiring line breakage occurs during folding
Solution Approach 1:
The patent applies different adhesion characteristics to different regions of the barrier layer. The first region (under the display area) has strong adhesion to provide structural support, while the second region (fold area) has weak adhesion to allow folding without breaking wiring lines. This local differentiation resolves the contradiction between overall structural strength and local flexibility.
Solution Approach 2:
The barrier layer is divided into multiple regions with different adhesion properties to the resinous substrate. This segmentation allows the structure to have both strong adhesion where needed for strength and weak adhesion where flexibility is required for folding, preventing wiring line breakage while maintaining overall structural integrity.
2Adaptability or versatility
If the support substrate is made fully flexible to enable folding, then adaptability is improved, but structural stability deteriorates
Solution Approach 1:
The support substrate structure implements local quality by having different adhesion characteristics in different regions. The first region provides strong bonding for stability, while the second region provides weak bonding for flexibility and folding capability. This resolves the contradiction between overall structural stability and local adaptability for folding.
Solution Approach 2:
The barrier layer's adhesion to the resinous substrate is designed to be dynamic rather than uniform - strong in some regions and weak in others. This dynamic adhesion property allows the substrate to maintain stability when needed while enabling folding motion in specific areas, balancing adaptability and structural stability.
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
This design prevents the breakage of metal layers during folding, maintaining the reliability and reducing the reaction force, thus enhancing the structural integrity of the display device.
Implementation Method 1
an inorganic insulating barrier layer
Implementation Method 2
the second resinous substrate and the first barrier layer are bonded to each other via an adhesive layer
Data Source
AI summary
According to one embodiment, a display device includes a support substrate including a first resinous substrate, a second resinous substrate, and a first barrier layer provided between the first resinous substrate and the second resinous substrate and formed of an inorganic insulating material, and a plurality of display elements provided in a display area. The second resinous substrate adheres to the first barrier layer with a first adhesion strength under the display area. The support substrate has, between an end portion of the support substrate and the display area, an overlap area in which the second resinous substrate and the first barrier layer overlap each other with a second adhesion strength which is less than the first adhesion strength.