Stretchable Display Substrate Hollow Structure Stress Distribution
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Solution Overview
Problem
Stretchable display panels tend to break at a stretching ratio of 4% due to stress concentration between the wiring and display regions, causing failure, as they lack hollow structures in non-display areas like wiring regions, leading to metal connection line breakage.
Innovation Solution
Incorporating hollow structures with varying lengths in the display region, particularly in transition regions near the wiring area, and filling these structures with elastic organic layers to distribute tensile stress more evenly, enhancing the tensile strength and uniformity of the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hollow structures are added to the display region, then tensile strength is improved, but device complexity increases
Solution Approach 1:
The display region is segmented into multiple hollow structures (first, second, third hollow structures) with different configurations. Each hollow structure is positioned in specific regions (central region, first transition region, second transition region) to distribute tensile stress evenly across different zones, thereby improving overall tensile strength while managing structural complexity through functional segmentation
Solution Approach 2:
Different hollow structures are designed with different local qualities - the first hollow structure has a first configuration suitable for the central region, the second hollow structure has a second configuration for the first transition region, and the third hollow structure has a third configuration for the second transition region. This local differentiation allows each structure to optimally address the specific stress conditions in its region
2Stress or pressure
If hollow structures are added to the transition region, then stress concentration is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The transition region is divided into a first transition region and a second transition region, each containing hollow structures with specific configurations. This segmentation allows stress concentration to be addressed in a distributed manner across multiple localized structures rather than requiring a single complex structure, thereby reducing the precision burden on any single hollow structure while still achieving stress distribution
Solution Approach 2:
Hollow structures in the transition regions are designed with configurations that differ from those in the central region, specifically tailored to address the stress concentration characteristics of transition zones. This local quality adjustment allows the structure to adapt to varying stress conditions without requiring uniform high precision across the entire display panel
3Adaptability or versatility
If hollow structures are used throughout the display region, then stretching ratio is improved, but reliability decreases due to breakage in wiring region
Solution Approach 1:
The display region is segmented into a central region and transition regions, with hollow structures strategically positioned in each segment. This segmentation allows the hollow structures to be concentrated in regions that benefit most from stretching (central and transition regions) while avoiding the wiring region, thereby improving stretching ratio without compromising reliability
Solution Approach 2:
Hollow structures are selectively positioned in the central region and transition regions where they provide maximum benefit for stretching, while the wiring region is excluded from hollow structures to maintain reliability. This local quality differentiation ensures that each region has the appropriate structure for its function - stretching capability in display regions and structural integrity in wiring regions
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 solution effectively increases the stretching ratio to 5%-6% by reducing stress concentration and preventing breakage, while maintaining the structural integrity of the display substrate and its metal connections.
Implementation Method 1
filling these structures with elastic organic layers to distribute tensile stress more evenly
Data Source
AI summary
The present disclosure provides a stretchable display substrate and a stretchable display device. The stretchable display substrate includes a substrate having a wiring region and a display region along a first direction, the display region including a plurality of display units and a plurality of connecting units, the plurality of display units being spaced apart from each other and arranged in an array; each of the hollow structures having a first extending portion extending along a second direction, wherein the display region includes a first transition region close to the wiring region and a central region away from the wiring region, and the first length of the first extending portion of each of the hollow structures in the transition region is not greater than the first length of the first extending portion of each of the hollow structures in the central region.