Display Substrate Groove Structure for Crack-Resistant Encapsulation
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Solution Overview
Problem
AMOLED display substrates suffer from poor impact resistance, leading to cracks during manufacturing or transportation, which can allow moisture or oxygen ingress, causing black spots and affecting display quality.
Innovation Solution
A display substrate design featuring a base substrate with stacked inorganic film layers and grooves, covered by an organic layer, where the grooves are spaced to prevent crack extension and include a non-overlapping bonding region, enhancing impact resistance and moisture/oxygen barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the base substrate is made thin for flexibility and small thickness, then the display substrate achieves bendability and compact form factor, but the impact resistance deteriorates leading to cracks during manufacturing or transportation
Solution Approach 1:
The patent applies composite materials by combining multiple inorganic film layers (such as alternating layers of silicon oxide and silicon nitride) with different mechanical and barrier properties. This multi-layer composite structure enhances impact resistance and prevents crack propagation while maintaining the overall thin profile of the display substrate, thereby resolving the contradiction between thinness and strength.
2Length of moving object
If the base substrate is made thin for flexibility, then the display substrate achieves bendability, but the encapsulation effectiveness deteriorates allowing moisture or oxygen ingress
Solution Approach 1:
The patent employs composite inorganic film layers with alternating materials (e.g., silicon oxide and silicon nitride) that provide complementary barrier properties. This composite structure creates an effective moisture and oxygen barrier while maintaining substrate flexibility and thinness, thus resolving the contradiction between thinness and encapsulation effectiveness.
Solution Approach 2:
The patent addresses the barrier function by adding multiple thin film layers in the vertical dimension rather than increasing the lateral dimensions. This multi-layer approach creates effective barrier paths against moisture and oxygen ingress while keeping the substrate thin and flexible, resolving the contradiction between thickness and encapsulation effectiveness.
3Strength
If grooves are formed to prevent crack extension, then the impact resistance is improved, but the device complexity increases due to additional manufacturing steps
Solution Approach 1:
The patent applies segmentation by forming grooves that divide the inorganic film layers into separate segments or regions. These grooves act as crack barriers that stop crack propagation across the substrate. The segmentation is achieved through standard photolithography and etching processes, integrating the crack prevention function into the existing manufacturing flow without requiring entirely new process equipment, thus improving impact resistance while controlling manufacturing complexity.
4Reliability
If multiple inorganic film layers are stacked to improve barrier performance, then the moisture and oxygen blocking is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent uses composite inorganic film layers with alternating materials that have different deposition characteristics and barrier properties. This approach enhances moisture and oxygen blocking through the synergistic effect of multiple materials, while the use of standard deposition techniques for each layer type helps manage manufacturing precision requirements.
Solution Approach 2:
The patent employs multiple inorganic film layers, providing a redundant barrier system. Even if one layer has minor defects or variations in deposition quality, the additional layers compensate for these imperfections, maintaining effective barrier performance. This partial or excessive action approach relaxes the precision requirements for individual layers while achieving high overall barrier performance.
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.