Stretchable Display Panel Island-Bridge Substrate Design
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Solution Overview
Problem
Current stretchable display panels face limitations in flexibility and resolution due to the need for large vias and encapsulating layers, which compromise their stretchability and display quality.
Innovation Solution
A stretchable display panel design featuring a supporting structure with islands and bridges on a stretchable base substrate, where the islands have a higher Young's Modulus than the bridges, allowing the substrate to buckle and enhancing stretchability without large vias, and an encapsulating layer that simplifies the display area, improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large vias and encapsulating layers are used in stretchable display panels, then structural support and encapsulation are improved, but stretchability and display resolution deteriorate
Solution Approach 1:
The supporting structure is segmented into discrete islands and bridges rather than using continuous large vias. The islands provide localized support for display elements while the bridges connect them with minimal material, enabling stretchability. This segmentation allows the structure to flex and deform without compromising overall support.
Solution Approach 2:
Different regions of the supporting structure have different Young's Modulus values - the islands have higher Young's Modulus for structural support while the bridges have lower Young's Modulus to allow deformation. This local differentiation of mechanical properties enables simultaneous structural integrity and stretchability.
2Strength
If large vias are used in stretchable display panels, then structural support is improved, but display resolution deteriorates
Solution Approach 1:
The supporting structure is divided into small island units rather than large continuous vias. This segmentation reduces the area occupied by support structures, allowing more display elements to be packed into the same space, thereby improving resolution while maintaining structural support through the distributed island network.
Solution Approach 2:
The supporting structure transitions from a two-dimensional planar via structure to a three-dimensional island-bridge architecture with varying thicknesses. The islands have greater thickness for support while the bridges are thinner, creating vertical dimensionality that provides both structural strength and space for high-resolution display elements.
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 improves the stretchability and display quality of the panel by allowing even distribution of subpixels and reducing the need for large vias, thereby enhancing the panel's flexibility and resolution.
Implementation Method 1
at least a portion of a respective one of the plurality of bridges is buckled when substantially unstretched; at least a portion of the stretchable base substrate in a region corresponding to the respective one of the plurality of bridges is buckled when substantially unstretched
Implementation Method 2
regions of the stretchable display panel corresponding to the plurality of islands have a Young's Modulus greater than a Young's Modulus of regions of the stretchable display panel corresponding to the plurality of bridges
Data Source
AI summary
A stretchable display panel is provided. The stretchable display panel includes a stretchable base substrate; a plurality of islands and a plurality of bridges on the stretchable base substrate; a plurality of display elements respectively on sides of the plurality of islands away from the stretchable base substrate; and a plurality of signal lines respectively on sides of the plurality of bridges away from the stretchable base substrate. The plurality of bridges include a plurality of row bridges arranged in a row direction and a plurality of column bridges arranged in a column direction. Two directly adjacent islands in a same row of islands are connected by a respective one of the plurality of row bridges. Two directly adjacent islands in a same column of islands are connected by a respective one of the plurality of column bridges.