Low-Permittivity OLED Encapsulation Composition for Touch-Sensitive Displays
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Solution Overview
Problem
Existing encapsulation compositions for organic light-emitting devices fail to effectively block moisture and oxygen, leading to degradation of luminescence characteristics and lifespan, while also causing decreased touch sensitivity due to high permittivity materials.
Innovation Solution
A composition comprising photocurable monomers represented by Chemical Formulae 1 to 3 and a photopolymerization initiator, with permittivity of 2.65 or less at 100 kHz to 1 MHz, is used to form an encapsulation layer with low permittivity and high effectiveness in blocking moisture and oxygen.
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 composition to 2.65 or less, which is lower than conventional materials. This parameter change allows the protective layer to maintain effective moisture and oxygen blocking while reducing polarization effects that degrade touch sensitivity, thus resolving the contradiction between protection performance and touch sensitivity
Solution Approach 2:
The patent uses a composite encapsulation composition containing specific photocurable monomers (Formulae 1-3) and photopolymerization initiators in defined ratios. This composite material achieves both low permittivity (2.65 or less) and effective barrier properties, simultaneously满足 protection requirements and touch sensitivity requirements
2Device complexity
If conventional encapsulation materials are used, then the structure is simple, but the lifespan of the organic light-emitting device deteriorates due to moisture and oxygen infiltration
Solution Approach 1:
The patent changes the chemical composition parameters of the encapsulation material by specifying particular photocurable monomers (Formulae 1-3) with defined structures and ratios. This parameter optimization enhances the barrier performance against moisture and oxygen, thereby extending device lifespan while maintaining reasonable structural complexity
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 secures the performance and lifespan of organic light-emitting devices by effectively blocking moisture and oxygen, while maintaining excellent touch sensitivity of the touch panel.
Implementation Method 1
a photocurable monomer including all monomers represented by Chemical Formulae 1 to 3; and a photopolymerization initiator
Data Source
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.