Stretchable Display Substrate Opening Patterns Bridge Fracture
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Solution Overview
Problem
Existing OLED flexible display devices face challenges in achieving sufficient stretchability and theoretical pixel density due to stress concentration in bridge areas, leading to potential fractures and limited maximum stretching amounts.
Innovation Solution
A display substrate with a stretchable base featuring opening patterns that include elongated hole sections and bridge areas, allowing for the distribution of tensile force across both bridge and island areas, thereby reducing stress concentration and enhancing stretching performance and pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a base material is bored to form islands and bridges for wiring in OLED flexible display devices, then the device can implement folding and basic stretching, but stress concentration occurs in the bridge areas leading to potential fractures and limited maximum stretching amounts
Solution Approach 1:
The base material is segmented into multiple island areas and bridge areas through a specific opening pattern design. Each opening pattern includes multiple opening areas that define island regions, with bridge areas formed between them. This segmentation allows the structure to distribute mechanical stress across multiple discrete regions rather than concentrating it in single continuous bridges, thereby improving fracture resistance while maintaining flexibility.
Solution Approach 2:
Different regions of the base material are given different structural qualities: island areas are designed with specific geometries to accommodate display elements, while bridge areas are optimized for mechanical flexibility and stress distribution. The opening patterns create localized structural variations where bridge areas have reduced material presence to enhance stretchability without compromising the integrity of island areas that house critical display components.
2Ease of operation
If bridge areas are designed to connect island areas for wiring, then the display device can be stretched, but stress concentration in the bridge areas limits the maximum stretching amount and causes potential fractures
Solution Approach 1:
The connection structure is segmented into multiple discrete bridge areas rather than using continuous bridges. Each bridge area is separated by opening areas, creating a patterned structure that distributes tensile stress across multiple discrete connection points. This segmentation prevents stress concentration that would occur in continuous bridges, allowing greater stretching amounts before fracture occurs.
Solution Approach 2:
The base material structure combines rigid island areas with more flexible bridge areas in a composite arrangement. The opening patterns create a composite structure where different regions have different mechanical properties - island areas maintain structural integrity for housing display elements, while bridge areas provide flexibility and stress absorption to enable larger stretching amounts.
3Productivity
If the display substrate uses traditional island and bridge structure, then basic flexible display is achieved, but the theoretical pixel density is limited due to stress concentration and structural constraints
Solution Approach 1:
The opening patterns are segmented into repeating modular units that can be tiled across the display substrate. Each module contains a specific arrangement of opening areas and bridge areas that encloses island regions. This modular segmentation allows for systematic optimization of pixel density while maintaining manufacturability through repeated patterns, rather than requiring complex non-repeating structures.
Solution Approach 2:
The opening pattern design uses copied and repeated geometric motifs across the substrate to create the island-bridge structure. By copying a fundamental pattern unit multiple times in a regular array, the design achieves high pixel density through increased island count while avoiding the need for complex unique patterns for each island, thus managing device complexity through repetition rather than variation.
Data Source
AI summary
The present disclosure relates to a display substrate, a display device and a manufacturing method of the display substrate. The display substrate includes: a stretchable base including a plurality of opening patterns distributed along a surface of the stretchable base, wherein each of the plurality of opening patterns includes a plurality of opening areas, a plurality of bridge areas configured to enclose a first island area are formed between adjacent opening areas among the plurality of opening areas, and each of the plurality of opening patterns is configured to enclose a plurality of second island areas with at least two adjacent opening patterns; a plurality of display units respectively arranged on the first island area and the plurality of second island areas; and a plurality of signal lines respectively connected between the plurality of display units and respectively arranged in the plurality of bridge areas.