Grooved Dielectric Blocking Structure for Crack Prevention in Display Substrates
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Solution Overview
Problem
Conventional water-blocking layers in display substrates can generate cracks during the cutting process, which can propagate to the display area, leading to poor packaging and a wide frame in OLED displays.
Innovation Solution
A display substrate with a blocking structure in the peripheral area, featuring protrusions or grooves that thin or disconnect the water-blocking layer, preventing crack propagation to the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous water-blocking layer is used to cover the display substrate, then water resistance is improved, but cracks can propagate across the layer causing packaging failure
Solution Approach 1:
The water-blocking layer is segmented into multiple discrete blocks arranged in an array, rather than forming a continuous layer. Each block is separated by spacing, which prevents cracks from propagating across the entire layer while maintaining water resistance through the distributed barrier structure
Solution Approach 2:
The blocking structures act as intermediary elements between the water-blocking layer and the display area. These blocks interrupt crack propagation paths while still providing water resistance, serving as mediators that protect the display area from both moisture and mechanical failures
2Area of stationary object
If the frame area is reduced for narrow frame design, then device size is improved, but crack blocking capability may be compromised
Solution Approach 1:
The blocking structures extend in multiple dimensions with varying cross-sectional areas along their length. This dimensional variation allows the blocks to provide effective crack blocking while occupying minimal frame area, enabling narrow frame design without sacrificing reliability
3Reliability
If the water-blocking layer thickness is increased to improve water resistance, then packaging quality is improved, but the layer becomes more prone to cracking
Solution Approach 1:
By segmenting the water-blocking layer into discrete blocks, the patent achieves effective water resistance without requiring excessive thickness. The segmented structure distributes stress and prevents crack propagation, allowing thinner individual blocks that are less prone to cracking while maintaining overall packaging quality
Solution Approach 2:
The blocking structures have varying thickness profiles along their length, with thicker sections providing water resistance and thinner sections reducing stress concentration. This local variation in quality optimizes both water resistance and crack resistance without requiring uniform thickness throughout
Data Source
AI summary
A display substrate has blocking structures. The display substrate includes a base substrate, a display structure on a display area of the base substrate, at least one blocking structure on a peripheral area around the display area of the base substrate, and a first water-blocking layer on the substrate. The first water-blocking layer may cover the display structure and the at least one blocking structure. The blocking structure may be configured to block cracks generated on the first water-blocking layer at a side of the blocking structure opposite from the display area from propagating to the display area.