Barrier Layer Hole Sections for Flexible Display Crack Prevention
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Solution Overview
Problem
Flexible display panels face reduced production yield due to cracks extending from the substrate edge to the circuit area during bending, as existing methods to prevent crack propagation are incomplete and inefficient.
Innovation Solution
A display substrate with a barrier layer featuring alternately arranged rows of first hole sections, where the projections of adjacent rows overlap, made of inorganic material and filled with organic material, to block crack propagation from the substrate edge to the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic materials are dredged to form an inorganic empty slot to prevent cracks, then crack prevention is improved, but manufacturing precision deteriorates because the inorganic materials may not be etched cleanly
Solution Approach 1:
The barrier layer is divided into multiple rows of hole sections (first hole sections and second hole sections) arranged in a grid pattern. This segmentation ensures that even if some hole sections are not etched cleanly, the adjacent etched sections can still block crack propagation, thereby maintaining crack prevention effectiveness while reducing sensitivity to etching precision
Solution Approach 2:
Different regions of the barrier layer have different structures: the first hole sections are filled with organic material while the second hole sections remain as inorganic material empty slots. This local differentiation allows the structure to leverage both the flexibility of organic materials and the crack-blocking capability of inorganic materials, improving overall crack prevention while being tolerant of incomplete etching
2Reliability
If inorganic materials are dredged entirely at a safe distance from the cutting line, then crack prevention is improved, but device complexity increases due to package requirements
Solution Approach 1:
The barrier layer structure extends in two dimensions (multiple rows and multiple columns of hole sections) rather than relying on a single linear dredged slot. This two-dimensional arrangement provides redundant crack blocking paths, improving crack prevention effectiveness while allowing a more compact design that reduces package complexity
Data Source
AI summary
A display substrate and a display device are provided. The display substrate includes a display area located inside the display substrate and a barrier layer, located between the display area and a substrate edge of the display substrate, wherein the barrier layer includes at least two rows of first hole sections arranged alternately on a direction from the display area to the substrate edge, each row of the first hole sections includes at least two first hole sections arranged alternately on an extending direction of the substrate edge, wherein a projection of the first hole sections of the adjacent rows on the extending direction of the substrate edge overlaps each other. By practice of the disclosure, the extending of the crack could be effectively avoided, so the product yield could be improved.