Display Substrate Corner Concavity for Wrinkle-Free Panel Bending
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Solution Overview
Problem
Existing display substrates face issues with stress concentration and wrinkle formation at corner edge portions during bending, leading to poor display panel manufacturing yield and reliability due to incomplete cover plate attachment or peeling.
Innovation Solution
The display substrate design incorporates a concave portion at the corner edge with reduced distance to adjacent edges, grooves, and multi-layer isolation columns and barrier dams to reduce stress and prevent wrinkles, enhancing bonding and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the corner edge portion is formed with a standard distance to adjacent edges, then the structural simplicity is maintained, but stress concentration and wrinkle formation occur during bending
Solution Approach 1:
The patent applies local quality by creating a concave portion specifically at the corner edge portion where stress concentration occurs during bending. This local structural modification reduces stress at the critical corner area without changing the overall edge structure, thereby improving bonding reliability only where needed while maintaining structural simplicity elsewhere.
2Reliability
If the corner edge portion is designed with reduced distance to adjacent edges forming a concave portion, then stress concentration is reduced and wrinkles are prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by modifying the geometric parameters of the corner edge portion - specifically reducing the distance from the corner to adjacent edges to create a concave shape. This parameter modification changes the stress distribution during bending, preventing wrinkle formation and improving manufacturing yield while establishing new dimensional specifications for production.
3Adaptability or versatility
If the peripheral region is made bendable towards the non-display side, then the curved screen effect is achieved, but stress concentration at corner portions causes incomplete cover plate attachment
Solution Approach 1:
The patent applies local quality by creating a concave portion specifically at the corner edge portion where stress concentration occurs during bending. This local structural modification reduces stress at the critical corner area without changing the overall edge structure, thereby improving bonding reliability only where needed while maintaining structural simplicity elsewhere.
Solution Approach 2:
The patent applies curvature by forming a concave portion at the corner edge, creating a curved geometry that better accommodates the bending stress during curved screen formation. This curved structure at the corner prevents stress concentration and wrinkle formation, enabling complete and reliable cover plate attachment while maintaining the overall curved screen capability.
4Reliability
If the corner edge portion is designed with concave geometry, then wrinkle formation is prevented, but the device complexity increases due to additional structural features
Solution Approach 1:
The patent applies local quality by creating a concave portion specifically at the corner edge portion where stress concentration occurs during bending. This local structural modification reduces stress at the critical corner area without changing the overall edge structure, thereby improving bonding reliability only where needed while maintaining structural simplicity elsewhere.
Data Source
AI summary
A display substrate and a display panel, the display substrate includes a display region and a peripheral region surrounding the display region, the peripheral region has a first linear edge portion extending in a first direction, a second linear edge portion extending in a second direction and a corner edge portion connecting the first linear edge portion and the second linear edge portion, the first direction and the second direction intersect to each other, and a minimum distance between at least a portion of the corner edge portion and an adjacent edge of the display region is smaller than a minimum distance between the first linear edge portion and/or the second linear edge portion and an adjacent edge of the display region, so as to form a concave portion in the corner edge portion towards the display region.