Metal Mesh Sealing Substructure for OLED Peel Strength
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) in display devices are sensitive to moisture and gas, leading to reduced lifespan due to low adhesion between sealing members and substrates, resulting in poor peel strength and potential separation.
Innovation Solution
Incorporating a metal mesh layer with a mesh shape in the sealing substructure of the display panel, which enhances adhesion between the sealing member and substrates, improves thermal conductivity, and increases light efficiency, thereby preventing separation and extending the OLED's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member (frit) is used to isolate the OLED from moisture and gas, then the OLED is protected from external environment, but the adhesion between the sealing member and substrate is low, resulting in poor peel strength
Solution Approach 1:
The patent introduces a multi-layer sealing substructure comprising a first insulation layer, a first metal layer, a second insulation layer, and a metal mesh layer. This composite structure combines materials with different properties: the metal layers provide adhesion and thermal conductivity, the insulation layers provide electrical isolation, and the mesh structure increases surface area for bonding. This resolves the contradiction by achieving both reliable sealing and high peel strength through material composition rather than using a single frit material.
Solution Approach 2:
The patent transitions from a conventional planar sealing member to a multi-dimensional multi-layer structure. The sealing substructure extends in the vertical dimension with multiple layers stacked together, and the metal mesh layer introduces a three-dimensional network structure. This dimensional change increases the effective bonding surface area and creates mechanical interlocking, thereby improving peel strength while maintaining the sealing function.
2Device complexity
If a conventional sealing member is used, then the structure is simple, but the thermal conductivity and light efficiency are insufficient
Solution Approach 1:
The metal mesh layer in the sealing substructure serves multiple functions simultaneously: it provides thermal conduction to dissipate heat from the OLED, enhances adhesion between layers, and improves light extraction efficiency. This multi-functionality resolves the contradiction by achieving improved thermal and optical performance without proportionally increasing structural complexity, as the same structural element (metal mesh layer) performs multiple roles.
3Ease of manufacture
If a conventional sealing member is used, then the manufacturing process is simple, but the adhesion between sealing member and substrate is low
Solution Approach 1:
The patent incorporates adhesion promotion layers (metal layers) during the early stages of the sealing substructure formation, before the final sealing member is applied. The first metal layer is deposited on the first insulation layer to create a bonding interface that enhances adhesion from the outset. This preliminary action ensures strong adhesion is built into the structure during manufacturing rather than requiring additional post-processing steps, thus maintaining ease of manufacture while improving strength.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced adhesion and thermal conductivity of the metal mesh layer increase the peel strength of the display panel, leading to a longer lifespan of the organic light emitting display device while maintaining high performance.
Implementation Method 1
the metal mesh layer having a mesh shape; and a sealing member between the sealing substructure and the second substrate to seal between the first substrate and the second substrate
Implementation Method 2
the sealing substructure including a metal mesh layer having a mesh shape... the display panel is capable of preventing or substantially preventing separation of a substrate
Data Source
AI summary
A display panel including: a first substrate; a second substrate opposing the first substrate; a sealing substructure on the first substrate, the sealing substructure surrounding a display unit having a plurality of pixels, the sealing substructure including a metal mesh layer having a mesh shape; and a sealing member between the sealing substructure and the second substrate to seal between the first substrate and the second substrate.