Grooved AMOLED Display Substrate for Edge Crack Containment
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Solution Overview
Problem
Active matrix organic light emitting diode (AMOLED) display substrates suffer from poor impact resistance, leading to cracks during manufacturing or transportation, which can allow moisture or oxygen to enter the display region, causing quality issues and black spots due to their sensitivity and flexibility.
Innovation Solution
A display substrate design featuring a base substrate with stacked inorganic film layers and first grooves in the edge region, where the grooves run through the inorganic film layers and are covered by an organic layer, enhancing impact resistance and preventing crack extension into the encapsulation region, while ensuring the bonding region remains protected from corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the AMOLED display substrate is made thin and flexible, then the display performance and bendability are improved, but the impact resistance deteriorates, leading to cracks during manufacturing or transportation
Solution Approach 1:
The substrate edge region is segmented into multiple zones by forming first grooves that divide the edge region into multiple edge sub-regions. This segmentation allows the edge region to better absorb impact forces through controlled deformation, preventing crack propagation into the display region while maintaining overall substrate integrity.
Solution Approach 2:
The first grooves are positioned specifically in the edge region at a distance from the display region, creating local structural variations only where needed. The grooves have specific depth and spacing parameters that provide enhanced impact resistance at the edges without affecting the display region or requiring changes to the overall substrate design.
2Strength
If the edge region is reinforced to prevent cracks, then the impact resistance is improved, but the bonding region may be affected by corrosion or manufacturing defects
Solution Approach 1:
The first grooves are positioned at a controlled distance from the display region and bonding region, creating localized reinforcement only in the edge sub-regions. This ensures that the bonding region maintains its integrity for reliable electrical connections while the edge regions provide crack prevention through the groove structure.
Solution Approach 2:
The edge region is divided into multiple independent edge sub-regions by the first grooves, isolating potential crack propagation paths. This segmentation ensures that even if cracks form in one edge sub-region, they cannot propagate to the bonding region or display region, maintaining bonding region reliability.
3Reliability
If the first grooves are formed closer to the display region, then the crack prevention effectiveness is improved, but the bonding region may be exposed to corrosion or damage
Solution Approach 1:
The first grooves are positioned at an optimized distance from the display region, providing effective crack prevention in the edge region while maintaining a safe buffer zone that protects the bonding region from corrosion and manufacturing defects. The groove depth and spacing are specifically designed to maximize crack prevention without compromising bonding region integrity.
Data Source
AI summary
A display substrate including: a base substrate with a display region, an encapsulation region and an edge region on a periphery of the encapsulation region, the edge region includes a bonding region on at least one side of the base substrate; a plurality of stacked inorganic film layers on a side of the base substrate; a plurality of first grooves, at the edge region, spaced apart from each other in a direction distal from the encapsulation region, and extending along a periphery of the base substrate, at least one of the plurality of first groove runs through at least one inorganic film layer of the plurality of inorganic film layers, and a distance between each first groove and the display region is larger than that between each first groove and an edge of the base substrate; and an organic layer.