OLED Display Substrate Barrier Structure for Crack Resistance
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Solution Overview
Problem
Current OLED display substrates with inorganic crack dams have poor anti-impact capabilities, leading to cracks when subjected to external collisions or twisting, which can result in moisture and oxygen ingress, causing growing black spots and package failures.
Innovation Solution
A display substrate with a barrier structure comprising a metal structure made of materials like molybdenum, titanium, or aluminum, covered by a protective polyimide layer, arranged in annular patterns around the display region to absorb impacts and prevent crack propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic crack dams are used to prevent cracks, then crack resistance is improved, but anti-impact capability deteriorates leading to cracks under external collisions or twisting
Solution Approach 1:
The patent changes the material parameters of the crack dam by using a composite structure with a first crack dam layer (inorganic material like silicon oxide or silicon nitride) and a second crack dam layer (organic material like polyimide). This composite approach combines the high hardness and crack-blocking capability of inorganic materials with the flexibility and impact resistance of organic materials, resolving the contradiction between crack resistance and anti-impact capability
Solution Approach 2:
The patent employs a composite crack dam structure consisting of multiple layers with different material properties. The first crack dam layer provides excellent crack resistance through its inorganic composition, while the second crack dam layer made of organic material provides flexibility and impact absorption. This composite material approach allows the crack dam to simultaneously achieve both crack resistance and anti-impact capability
2Reliability
If barrier structures are added to prevent moisture and oxygen ingress, then package reliability is improved, but device complexity increases
Solution Approach 1:
The crack dam structure in the patent serves multiple functions simultaneously: it acts as a physical barrier to prevent crack propagation, provides moisture barrier properties, and offers oxygen barrier properties. By integrating these multiple functions into a single barrier structure, the patent improves package reliability without proportionally increasing device complexity
Solution Approach 2:
The patent combines the crack prevention function and moisture/oxygen barrier function into a unified barrier structure. The multi-layer crack dam structure simultaneously performs mechanical crack blocking and chemical barrier functions, reducing the need for separate components and thereby limiting the increase in device complexity while improving overall package reliability
Data Source
AI summary
A display substrate is provided. The display substrate has a display region and a non-display region disposed around the display region and the display substrate includes a base substrate and a barrier structure disposed on a side of the base substrate. The barrier structure is disposed in the non-display region, and the barrier structure includes a metal structure and a protective layer which are arranged on the substrate in sequence and the protective layer covers the metal structure.