Low-Permittivity Encapsulation Composition for OLED Touch Sensitivity
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Solution Overview
Problem
Organic light-emitting devices are susceptible to degradation from external moisture and oxygen, which affects their luminescence characteristics and lifespan, and high permittivity materials in touch panels reduce touch sensitivity.
Innovation Solution
A composition for encapsulating organic light-emitting devices using photocurable monomers and a photopolymerization initiator, with permittivity of 2.65 or less and ring parameter of 0.01 to 0.25, forming a low permittivity encapsulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer with high permittivity material is used to block moisture and oxygen, then the protection performance is improved, but the touch sensitivity of the touch panel deteriorates
Solution Approach 1:
The patent changes the permittivity parameter of the encapsulation layer from conventional high permittivity (greater than 3.0) to low permittivity (2.65 or less). This parameter change resolves the contradiction by maintaining moisture and oxygen blocking performance while improving touch sensitivity, as lower permittivity reduces polarization effects that interfere with capacitive touch detection
Solution Approach 2:
The patent uses composite materials comprising specific photocurable monomers (cyclic carbonate monomers, cyclic carboxylate monomers, and/or cyclic sulfate monomers) combined with photopolymerization initiators. This composite material system achieves both low permittivity (2.65 or less) for improved touch sensitivity and high barrier performance against moisture and oxygen
2Reliability
If conventional encapsulation materials are used to protect the organic light-emitting device, then the device is protected from moisture and oxygen, but the touch panel sensitivity decreases due to high permittivity
Solution Approach 1:
The patent fundamentally changes the permittivity parameter of the encapsulation material from conventional values (greater than 3.0) to low permittivity values (2.65 or less). This parameter change simultaneously achieves device protection and maintains high touch sensitivity by reducing dielectric interference with the capacitive touch sensor
Solution Approach 2:
The patent applies different material properties to different functional requirements: the encapsulation layer is designed with low permittivity specifically for the touch panel region to maintain sensitivity, while maintaining adequate barrier properties for moisture and oxygen protection. The composition includes specific monomers (cyclic carbonate, cyclic carboxylate, and/or cyclic sulfate monomers) that provide localized low permittivity characteristics
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 composition effectively blocks moisture and oxygen, enhancing the device's performance and lifespan while maintaining excellent touch sensitivity.
Implementation Method 1
a photocurable monomer including all monomers represented by Chemical Formulae 1 to 3; and a photopolymerization initiator
Data Source
Figure 1
AI summary
The present invention relates to a composition for encapsulating an organic light-emitting device and an organic light-emitting display apparatus including the same, and more specifically, to a composition for encapsulating an organic light-emitting device and an organic light-emitting display apparatus including the same, wherein the composition not only secures the performance and lifespan of an organic light-emitting device by effectively blocking, from the outside, moisture or oxygen flowing into an organic light-emitting display apparatus, but also has low permittivity characteristics to improve touch sensitivity of a touch panel.