Anti-crack Projection Design for Bendable Display Substrates
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Solution Overview
Problem
Conventional display apparatuses are prone to cracks during manufacturing and usage due to external impacts, which can lead to defects and damage, especially in organic light-emitting display devices vulnerable to external impurities.
Innovation Solution
The display apparatus incorporates a substrate with a bending area and anti-crack projections in the peripheral region, featuring distinct bending and flat portions, along with a cover layer and encapsulation layer, to minimize crack propagation and prevent external impurities from penetrating into the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is made flexible to enable bending, then adaptability is improved, but reliability deteriorates due to increased crack risk
Solution Approach 1:
The anti-crack projection is divided into multiple portions (first portion in the first area, second portion in the second area) that can independently deform and absorb stress, preventing crack propagation across the entire substrate while maintaining bending capability
Solution Approach 2:
Different portions of the anti-crack projection have different characteristics: the first portion in the bending area is designed to deform with the substrate, while the second portion in the non-bending area maintains structural integrity, providing localized protection against cracks in different regions
2Reliability
If the anti-crack projection area is increased to prevent cracks, then reliability is improved, but device complexity increases
Solution Approach 1:
The anti-crack projection is configured to extend only partially across the substrate (from the first area to the second area, but not covering the entire substrate), providing sufficient crack prevention functionality while avoiding unnecessary complexity and material usage
Solution Approach 2:
The projection structure is segmented into distinct portions located in different areas of the substrate, with each portion serving specific functions, thereby simplifying the overall design while maintaining effective crack prevention
Data Source
AI summary
A display apparatus includes a substrate including a display area, a peripheral area outside the display area, and a bending area bendable along a bending axis, and an anti-crack projection disposed in the peripheral area and extending along at least a part of an edge of the substrate. A portion of the anti-crack projection in the bending area is a bending portion. A preset area including the bending portion on the substrate is a first area. A preset area of the substrate disposed outside the first area, having substantially the same area as that of the first area, and including a part of the anti-crack projection is a second area. A portion of the anti-crack projection belonging to the second area is a flat portion. The area occupied by the bending portion in the first area is greater than the area occupied by the flat portion in the second area.