Organic EL Display Multi-Barrier Adhesion
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Solution Overview
Problem
In organic EL display devices, the separation of facing substrates due to low adhesive properties between organic and inorganic barrier layers can occur, leading to moisture infiltration and deterioration of the organic layer, especially when foreign particles are present.
Innovation Solution
A multi-barrier structure is formed on the first substrate, comprising a first inorganic barrier layer, an organic barrier layer, and a second inorganic barrier layer, where the organic barrier is formed around foreign particles to reduce surface unevenness and prevent moisture infiltration, and the second inorganic barrier layer directly contacts the first inorganic barrier layer in areas without the organic barrier to enhance adhesion between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-barrier structure including organic barrier layer is formed to prevent moisture infiltration around foreign particles, then moisture prevention capability is improved, but adhesion between substrates deteriorates due to low adhesive properties between organic and inorganic materials
Solution Approach 1:
The patent applies local quality by forming the organic barrier layer selectively only in regions where foreign particles are detected, rather than uniformly across the entire substrate. This localized approach prevents moisture infiltration at critical points while minimizing the area where adhesion problems could occur, thus balancing moisture prevention with substrate bonding strength
Solution Approach 2:
The patent uses composite materials by combining organic barrier layer and inorganic barrier layers in a multi-layer structure. The organic layer provides superior moisture blocking properties around foreign particles, while the inorganic layers provide structural support and adhesion, creating a composite system that leverages the advantages of both material types
2Manufacturing precision
If the second inorganic barrier layer thickness is reduced to minimize pinhole formation, then manufacturing precision is improved, but coverage completeness over foreign particles deteriorates
Solution Approach 1:
The patent applies the nested doll principle by creating a multi-layer barrier structure where the organic barrier layer is positioned between two inorganic barrier layers. This nested configuration allows each layer to compensate for the limitations of the others, ensuring complete coverage of foreign particles while maintaining thin individual layer thicknesses to prevent pinhole formation
Solution Approach 2:
The patent uses dimensionality change by introducing an organic barrier layer that conforms to the three-dimensional shape of foreign particles, wrapping around them in a manner that planar inorganic layers cannot achieve. This dimensional approach ensures complete coverage even when the second inorganic layer is made thin
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
This configuration effectively prevents substrate separation and moisture infiltration, ensuring the integrity of the organic layer by improving the adhesion between substrates and reducing the risk of pinholes caused by foreign particles.
Implementation Method 1
The organic material on the first inorganic barrier layer is moved on the first inorganic barrier layer due to surface tension thereof, thereby forming a liquid droplet. When the foreign particle exists, the organic material coheres around the foreign particle due to the surface tension.
Data Source
AI summary
A bank layer includes projecting portions swollen toward in a thickness direction of a first substrate in an adhesion area. A multi-barrier includes a portion, in which a organic barrier is not disposed, on an upper side of the projecting portions. Therefore, it is possible to obtain, in the adhesion area, a portion in which a first inorganic barrier layer and a second inorganic barrier layer directly come in contact with each other. In an organic EL display device including the multi-barrier formed of an organic material and an inorganic material, it is possible to prevent two facing substrates from being separated from each other.