Stretchable Display Bridge With Segmented Insulating Blocks
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Solution Overview
Problem
Existing stretchable display panels face issues with non-homogeneous deformation during stretching, leading to pixel distortion and poor display quality due to a large difference in the width-to-thickness ratio of bridges, which causes stress and potential fracture.
Innovation Solution
The design features bridges with alternately arranged first and second parts, where the insulating layer is partially absent in the second parts, and signal lines are limited to the first parts, reducing stress and enhancing flexibility by using a more flexible material for the insulating layer and optimizing the width-to-thickness ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer is made continuous across bridges to provide electrical insulation, then insulation performance is improved, but stress concentration and fracture risk increase due to rigid structure
Solution Approach 1:
The insulating layer is segmented into discrete insulating blocks positioned only in the first parts of the bridges, rather than forming a continuous layer. This segmentation allows the bridge to flex and deform homogeneously during stretching while maintaining electrical insulation where needed, resolving the contradiction between insulation performance and fracture resistance.
Solution Approach 2:
The insulating layer is applied locally only in the first parts of the bridges where electrical insulation is required, and is intentionally absent in the second parts. This local quality approach provides insulation performance in critical areas while allowing stress distribution and flexibility in other areas, preventing fracture.
2Manufacturing precision
If the bridge width-to-thickness ratio is increased to reduce pixel distortion, then display quality is improved, but stress concentration increases leading to potential fracture
Solution Approach 1:
The bridge is segmented into first and second parts with different structural characteristics. The first parts have insulating blocks that maintain pixel co-planarity and display quality, while the second parts are free of insulating material to reduce stress concentration and prevent fracture during stretching.
Solution Approach 2:
Different regions of the bridge are given different properties: the first parts have insulating blocks for structural support and pixel alignment, while the second parts have no insulating layer to provide flexibility and stress relief, locally optimizing both display quality and fracture resistance.
3Reliability
If signal lines are routed through entire bridges to ensure connectivity, then electrical connectivity is improved, but stress-induced fracture risk increases
Solution Approach 1:
Signal lines are routed only through the first parts of the bridges where insulating blocks provide structural support, rather than spanning the entire bridge length. This segmentation protects signal lines from stress concentration in the second parts while maintaining connectivity through the supported first parts.
Solution Approach 2:
Signal lines are placed locally in the first parts of bridges where they receive mechanical support from insulating blocks, avoiding the high-stress second parts. This local routing strategy ensures connectivity while minimizing exposure to fracture-inducing stress.
Data Source
AI summary
A stretchable display panel is provided. The stretchable display panel includes a plurality of encapsulated islands; and a plurality of bridges connecting the plurality of encapsulated islands. A respective one of the plurality of bridges connects two adjacent encapsulated islands of the plurality of encapsulated islands along an extension direction from a first one of the two adjacent encapsulated islands to a second one of the two adjacent encapsulated islands. The respective one of the plurality of bridges includes a plurality of first parts and a plurality of second parts alternately arranged. The stretchable display panel includes an insulating layer. The insulating layer includes a plurality of insulating blocks respectively in the plurality of first parts. The insulating layer is at least partially absent in the respective one of the plurality of second parts.