Flexible Organic EL Device Sealing with Composite Glass-Resin Layer
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Solution Overview
Problem
Light-emitting elements utilizing organic electroluminescence (EL) face deterioration due to moisture and heat, and traditional sealing materials like glass have low heat dissipation and are prone to breakage, increasing device weight and risk of damage.
Innovation Solution
A light-emitting device is developed using a flexible substrate with high heat dissipation properties, such as stainless steel or duralumin, and sealed with a stack body or glass having moisture impermeability and high light-transmitting properties, reducing weight and deterioration while enhancing resistance to bending and shock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass is used as sealing material, then moisture impermeability is improved, but heat dissipation property deteriorates
Solution Approach 1:
The patent employs a composite sealing structure consisting of a glass substrate layer and a resin layer. The glass substrate provides moisture impermeability while the resin layer contributes to heat dissipation and flexibility. This composite approach resolves the contradiction by combining materials with complementary properties rather than relying on glass alone.
2Strength
If glass thickness is increased to obtain sufficient strength, then mechanical strength is improved, but device weight increases
Solution Approach 1:
The patent uses a composite sealing structure with a glass substrate and resin layer. The glass substrate can be made thinner than conventional single-glass designs because the resin layer contributes to overall mechanical strength. This reduces the weight of the sealing structure while maintaining sufficient strength, resolving the contradiction between strength and weight.
Solution Approach 2:
The patent optimizes the thickness parameters of both the glass substrate and resin layer to achieve the desired balance between strength and weight. By carefully controlling these dimensional parameters, the design obtains sufficient mechanical strength with minimal weight, avoiding the need for thick glass sections.
3Reliability
If glass is used as sealing material, then moisture impermeability is improved, but resistance to breakage deteriorates
Solution Approach 1:
The patent employs a composite sealing structure consisting of a glass substrate layer and a resin layer. The glass substrate provides moisture impermeability while the resin layer acts as a shock-absorbing buffer that improves resistance to breakage. The resin's flexibility compensates for glass's brittleness, resolving the contradiction between moisture protection and breakage resistance.
Solution Approach 2:
The resin layer in the composite sealing structure serves as a pre-positioned cushioning element that absorbs mechanical shocks and stresses before they can cause glass breakage. This beforehand cushioning protects the fragile glass substrate from sudden impacts, resolving the contradiction between using glass for moisture protection and maintaining breakage resistance.
4Illumination intensity
If light-emitting element operates at high luminance for long time, then illumination intensity is improved, but heat generation increases causing deterioration
Solution Approach 1:
The resin layer in the composite sealing structure acts as a thermal intermediary that facilitates heat dissipation from the light-emitting element. The resin's thermal conductivity and flexibility create an effective thermal management interface, allowing high luminance operation without excessive heat buildup that would cause deterioration.
Solution Approach 2:
The composite sealing structure combines glass and resin materials with different thermal properties. The resin layer provides better thermal management characteristics than glass alone, enabling the light-emitting element to operate at high luminance for extended periods without heat-induced deterioration.
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 solution results in a light-emitting device with reduced deterioration, lower weight, and improved resistance to heat, moisture, and mechanical stress, suitable for applications in lighting and display devices.
Implementation Method 1
A light-emitting element utilizing organic EL
Implementation Method 2
support substrate having flexibility and a high heat dissipation property
Implementation Method 3
sealing material having a light-transmitting property and moisture impermeability
Data Source
AI summary
It is known that a light-emitting element utilizing organic EL deteriorates due to moisture. Therefore, a sealing technique to prevent moisture permeation is important. A light-emitting device including a light-emitting element utilizing organic EL is manufactured over a support substrate having flexibility and a high heat dissipation property (e.g., stainless steel or duralumin), and the light-emitting device is sealed with a stack body having moisture impermeability and a high light-transmitting property or with glass having moisture impermeability and a high light-transmitting property and having a thickness greater than or equal to 20 μm and less than or equal to 100 μm.