Slim Border Sealed Structure for Organic EL Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sealed structures for light-emitting devices using organic electroluminescence (EL) face challenges in achieving a slim border with high sealing capability, as adhesives like resin tend to spread and contaminate the sealed region, while reducing adhesive quantity can lead to insufficient sealing.
Innovation Solution
A sealed structure comprising a pair of substrates with a glass layer in contact, where the glass layer defines a space between the substrates and has a corner portion width smaller than the side portion, suppressing adhesive spread and ensuring high adhesion for reliable sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resin adhesive is used to attach substrates, then sealing capability is provided, but adhesive spreads out of predetermined region and contaminates the sealed object
Solution Approach 1:
A resin layer is introduced as an intermediary material between the first substrate and second substrate. The resin layer has controlled viscosity and curing characteristics that prevent it from spreading beyond the predetermined region while still providing adequate adhesion and sealing capability.
Solution Approach 2:
The viscosity of the resin layer is controlled within a specific range to balance its ability to fill gaps and provide sealing versus its tendency to spread. By adjusting the viscosity parameter and curing conditions, the resin remains contained within the predetermined region while achieving sufficient sealing performance.
2Length of stationary object
If application quantity of resin is reduced to suppress spread, then slim border is achieved, but sufficient sealing capability is lost
Solution Approach 1:
The viscosity of the resin layer is optimized to a specific range that allows adequate sealing capability with reduced application quantity. The controlled viscosity prevents excessive spread while maintaining sufficient adhesion and sealing performance, enabling achievement of both slim border and reliable sealing.
Solution Approach 2:
Instead of relying on mechanical pressure and large quantities of adhesive to achieve sealing, the invention uses controlled chemical properties of the resin (viscosity, curing characteristics) to provide sealing capability with minimal material and reduced spread.
3Reliability
If application quantity of resin is increased to ensure sealing, then sealing capability is improved, but adhesive spreads and contaminates the sealed region
Solution Approach 1:
The resin layer viscosity is controlled within a specific range that provides adequate sealing capability without requiring excessive application quantity. This parameter optimization ensures that the resin fills necessary gaps and provides sealing while naturally limiting its spread beyond the predetermined region.
Solution Approach 2:
The resin layer serves as an intermediary with controlled flow characteristics that provide sufficient sealing material where needed while its viscosity and curing properties prevent it from invading the sealed region and causing contamination.
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 glass-based sealed structure achieves a slim border with enhanced sealing capability, preventing adhesive spread and contamination, and ensuring the organic EL element is protected from moisture and oxygen, thus improving the reliability and yield of light-emitting devices.
Implementation Method 1
a glass layer which is in contact with both of the substrates, defines a space between the substrates
Data Source
AI summary
A sealed structure which has high sealing capability and whose border can be slim is provided. The sealed structure includes a pair of substrates whose respective surfaces face each other with a space therebetween, and a glass layer which is in contact with the substrates, defines a space between the substrates, and has at least one corner portion and side portions in continuity with the corner portion. The width of the corner portion of the glass layer is smaller than or equal to that of the side portion of the same. The sealed structure may comprise a highly reliable light-emitting element including a layer containing a light-emitting organic compound provided between a pair of electrodes.