Transparent Resin Composition for Organic EL Sealing
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Solution Overview
Problem
Existing organic electroluminescent (EL) element sealing technologies fail to provide sufficient moisture shielding and flexibility, leading to the generation of dark spots that deteriorate visibility in organic EL displays and lightings.
Innovation Solution
A transparent resin composition comprising a thermoplastic resin, a tackifying resin, and an organometallic compound with an ester bond, specifically a styrene-based A-B-A type triblock body and a hydride of petroleum resins, which forms a resin sheet for sealing that offers high light transmittance, excellent water absorbency, and low moisture permeability, ensuring effective shielding and maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent sealing substrate made of glass or a sealing can is used to shield the organic EL element from moisture and impurities, then the shielding effect against moisture is improved, but the device cannot be made flexible
Solution Approach 1:
The patent uses a transparent resin sealing layer instead of rigid glass or metal sealing cans. The resin sealing layer is applied as a thin film that conformally covers the organic EL element, providing moisture barrier protection while allowing the overall device to be flexible and bendable, thus enabling flexible display and lighting applications.
Solution Approach 2:
The patent employs a composite sealing structure consisting of a transparent resin sealing layer formed from specific resin components. This composite material approach combines the moisture barrier properties of the resin with the flexibility requirements, creating a sealing solution that achieves both protection and flexibility simultaneously.
2Adaptability or versatility
If a thermoplastic resin is used as a transparent sealing material to obtain flexibility, then the flexibility is improved, but the shielding effect against moisture becomes insufficient
Solution Approach 1:
The patent optimizes the molecular weight parameters of the resin components to achieve the desired balance between flexibility and moisture barrier performance. By controlling the weight average molecular weight within specific ranges and adjusting the composition ratios, the resin sealing layer attains both sufficient flexibility for flexible devices and adequate moisture shielding capability.
Solution Approach 2:
The patent creates a composite resin system combining thermoplastic resin with specific additives and modifiers. This composite material formulation enhances the moisture barrier properties of the thermoplastic resin while maintaining its flexibility, resolving the contradiction between these two properties.
3Illumination intensity
If the resin composition has high transparency to maintain visibility, then the light transmittance is improved, but the shielding effect against moisture may be compromised
Solution Approach 1:
The patent carefully selects and controls the molecular weight parameters and chemical composition of the resin components to achieve optimal optical and barrier properties. By adjusting parameters such as weight average molecular weight and composition ratios, the resin sealing layer simultaneously achieves high light transmittance for good visibility and sufficient moisture barrier performance.
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 resin composition effectively suppresses the generation of dark spots, enhances image visibility, and maintains transparency, allowing for flexible sealing without impairing the organic EL element's performance, regardless of the light emission mode.
Implementation Method 1
an organometallic compound having at least an ester bond and represented by the following formula (Chemical Formula 1)
Implementation Method 2
the resin composition having a light transmittance of 85% or higher for light having a wavelength of 550 nm at a thickness of 0.1 mm
Data Source
AI summary
A transparent resin composition for organic EL element sealing and other things having a sufficient moisture blocking effect and excellent flexibility is provided. A thermoplastic resin, a tackifying resin, and an organometallic compound having at least an ester bond and represented by the following formula are included, and in which the light transmittance for light is 85% or higher, the relationship: AM/Y<162 is satisfied, and the thermoplastic resin includes a hydride of a styrene-based A-B-A type triblock body.(wherein R1, R2, R4 and R6 represent organic groups including an alkyl group, an aryl group, a cycloalkyl group, and an acyl group each having a carbon number of 1˜8; R3 and R5 represent organic groups including an alkyl group, an aryl group, an alkoxy group, a cycloalkyl group, and an acyl group each having a carbon number of 1˜8; and M represents a trivalent metal atom.)