Organic Light Emitting Display Sealing with Filler-Enhanced Second Sealant
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Solution Overview
Problem
Organic light emitting display devices face deterioration due to external factors such as oxygen and moisture penetration, which can damage the display unit and reduce the device's lifespan and impact resistance.
Innovation Solution
The use of a second sealant with a filler having a particle size larger than the gap between substrates to block external gases and enhance impact resistance, combined with a first sealant for adhering the substrates, effectively prevents gas penetration and reinforces the device's structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a sealant is used to adhere the first substrate and second substrate, then the substrates are bonded together, but external oxygen and moisture can penetrate through the interface between the sealant and substrates, damaging the display unit
Solution Approach 1:
The sealing structure is divided into two distinct parts: a first sealant for adhering the substrates together, and a second sealant applied around the first sealant to provide enhanced sealing. This segmentation allows each sealant to perform its specific function - the first for bonding and the second for preventing gas penetration through the interface.
Solution Approach 2:
The second sealant is formulated as a composite material containing filler particles with specific size ranges (0.1-10 μm average diameter). This composite structure combines the adhesive properties of the sealant matrix with the blocking capability of the filler particles, creating a material that effectively prevents gas penetration while maintaining flexibility.
2Object-affected harmful factors
If the sealant is applied to seal the gap between substrates, then gas penetration is reduced, but the sealant part becomes easily broken due to impact
Solution Approach 1:
The filler particle size in the second sealant is carefully controlled within a specific range (0.1-10 μm average diameter, with maximum particles not exceeding 50 μm). This parameter optimization ensures that the filler particles are small enough to effectively block gas molecules while being large enough to provide structural reinforcement and impact resistance to the sealant.
3Strength
If a filler with large particle size is used in the second sealant, then impact resistance is improved, but the filler may not effectively block small gaps
Solution Approach 1:
The filler particle size distribution is precisely controlled with an average diameter of 0.1-10 μm and maximum particles not exceeding 50 μm. This parameter optimization ensures that the filler particles are small enough to effectively block gas molecules while being large enough to provide structural reinforcement and impact resistance to the sealant.
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 solution effectively prevents external gas penetration, extends the lifespan of the organic light emitting display device, and enhances its impact resistance by creating a barrier against moisture and oxygen, thereby protecting the display unit.
Implementation Method 1
a second sealant around the first sealant, the second sealant sealing a gap between the first substrate and the second substrate, in which the second sealant includes a filler, and a particle size of the filler is larger than the gap between the first substrate and the second substrate
Data Source
AI summary
Disclosed is an organic light emitting display device which prevents or inhibits external gas, such as, oxygen or moisture, from penetrating into a display unit and reinforces a mechanical strength by providing a first sealant and a second sealant. The organic light emitting display device may include: a first substrate; a display unit on the first substrate; a second substrate covering the display unit; a first sealant adhering the first substrate to the second substrate; and a second sealant around the first sealant, the second sealant sealing the first substrate and the second substrate. A filler may be included in the second sealant, and a particle size of the filler may be larger than a gap between the first substrate and the second substrate.