Foldable Display Adhesive Grid to Prevent Curing Deformation
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Solution Overview
Problem
Traditional foldable display assembly techniques using continuous adhesive layers result in deformation due to pressure differentials during curing, leading to aesthetic issues or reduced mechanical robustness.
Innovation Solution
Adhesive layers are arranged in a grid pattern with spaces between adhesive elements to equalize internal and external air pressure during curing, maintaining mechanical robustness and aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a continuous layer of adhesive is used to adhere the barrier layer to the support layer, then mechanical robustness is improved, but deformation occurs during the curing process due to pressure differentials
Solution Approach 1:
The continuous adhesive layer is segmented into a grid pattern of discrete adhesive elements with spaces between them. This segmentation allows air to pass through the adhesive layer during curing, equalizing pressure between the interior and exterior of the foldable display, thereby preventing deformation while maintaining mechanical robustness through the distributed adhesive elements.
2Strength
If a continuous layer of adhesive is used, then adhesion strength is improved, but the foldable display deforms during autoclave curing
Solution Approach 1:
The adhesive layer is divided into discrete adhesive elements arranged in a grid pattern, creating spaces that allow air flow during curing. This segmentation prevents pressure buildup that causes deformation while the distributed adhesive elements collectively provide sufficient adhesion strength to bond the barrier layer to the support layer.
3Shape
If an adhesive layer with a gap over the foldable region is used, then deformation is reduced, but mechanical robustness is reduced
Solution Approach 1:
Instead of creating a large gap in the adhesive layer over the foldable region, the adhesive is segmented into a grid of discrete elements. This provides distributed mechanical support across the foldable region, maintaining robustness while the spaces between elements allow pressure equalization to prevent deformation.
Solution Approach 2:
The adhesive elements are strategically positioned in a grid pattern to provide local adhesion and structural support where needed, while the spaces between them locally allow air flow for pressure equalization. This creates different local properties within the adhesive layer to simultaneously address deformation prevention and mechanical robustness.
4Ease of manufacture
If a continuous adhesive layer is used, then assembly simplicity is maintained, but curing process complexity increases due to pressure equalization issues
Solution Approach 1:
The adhesive layer is segmented into a grid pattern that inherently provides pressure equalization pathways during curing. This design simplifies the curing process by eliminating the need for complex pressure control mechanisms, as the segmented structure naturally allows air flow to equalize pressure between the interior and exterior of the foldable display.
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
Prevents deformation and maintains aesthetic appeal while ensuring robust adhesion and protection against dust and water intrusion in foldable displays.
Implementation Method 1
at least a portion of the adhesive layer includes a plurality of adhesive elements arranged in a grid having spaces there between
Data Source
AI summary
An example foldable display includes a continuous display that includes a flexible segment configured to fold, wherein the continuous display includes: a display layer comprising an optical display; a support layer underlying the display layer; a barrier layer underlying the support layer; and an adhesive layer adhering the barrier layer to the support layer, wherein at least a portion of the adhesive layer includes a plurality of adhesive elements arranged in a grid having spaces there between.