Flexible Display Barrier Layer Adhesion and Moisture Resistance
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Solution Overview
Problem
Current flexible substrates face issues with weaker water and oxygen blocking ability, peeling of film layers when bending, and separation at high temperature and high humidity, which affect their adhesion and performance.
Innovation Solution
A display panel design featuring two flexible layers and two barrier layers, where the barrier layers are composed of silicon oxide and silicon nitride with a mass ratio of 3x:7y, x=1 to 4, and y=1 to 4, improving adhesion and resistance to bending, high-temperature, and high-humidity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an alternatingly stacked structure of multiple layered polyimide/SiO2 is used to achieve water and oxygen blocking, then the ability to block water and oxygen is improved, but adhesion is insufficient causing peeling when bending or separation at high temperature and high humidity
Solution Approach 1:
The patent uses a composite barrier layer comprising SiO2 and Si3N4 materials. This composite structure combines the hydrophobic properties of SiO2 with the strong adhesion and chemical stability of Si3N4, achieving both effective water/oxygen blocking and reliable adhesion without peeling or separation under various conditions.
Solution Approach 2:
The patent optimizes the mass ratio parameters of SiO2 to Si3N4 (specifically 3:1, 2:1, or 1:1) to achieve the best balance between water/oxygen blocking ability and adhesion. By adjusting these compositional parameters, the barrier layer simultaneously achieves high barrier performance and strong bonding to flexible substrates.
2Ease of operation
If polyimide material is used for flexible substrates, then flexibility and lightweight properties are improved, but the inherent ability to block water and oxygen is weak
Solution Approach 1:
The patent divides the protective function into two separate layers: the polyimide flexible substrate provides flexibility and mechanical strength, while a dedicated SiO2-Si3N4 barrier layer provides water and oxygen blocking. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The patent creates a composite structure combining polyimide flexible substrate with SiO2-Si3N4 barrier layer. This composite material system integrates the advantages of both materials: the flexibility and processability of polyimide with the superior barrier properties of the inorganic SiO2-Si3N4 composite.
Data Source
AI summary
A display panel and a manufacturing method thereof are provided. The display panel includes a first flexible layer, a first barrier layer disposed on the first flexible layer, and a second flexible layer disposed on the first barrier layer. Wherein, a material of the first barrier layer includes silicon oxide and silicon nitride, a mass ratio of silicon oxide to silicon nitride is 3x:7y, and x=1 to 4 and y=1 to 4. The present disclosure can improve adhesion between the two flexible layers by disposing the barrier layer between the two flexible layers, thereby allowing a flexible substrate to have an ability to block water and oxygen, good adhesion, bending performance, high-temperature and high-humidity resistance, and optical transmittance.