Dual-Layer Sealant for OLED Impact Resistance
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Solution Overview
Problem
Conventional organic light-emitting display apparatuses are susceptible to permeation of external impurities like oxygen and water vapor, leading to device deterioration, and have low impact resistance due to the use of conventional sealants that can crack easily.
Innovation Solution
The use of a sealing member with a first sealant containing a filler, spaced apart from the substrates, and a second sealant without filler, which contacts the substrates and covers the first sealant, providing improved mechanical properties and flowability to prevent impurity permeation and enhance impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional sealant is used to combine substrates, then the sealing function is provided, but impurities such as oxygen or water vapor can permeate through the interface and the sealant breaks easily by impact
Solution Approach 1:
The sealant is divided into two distinct layers: a first sealant layer containing filler particles for mechanical strength and impact resistance, and a second sealant layer without filler for hermetic sealing and impurity prevention. This segmentation allows each layer to perform its specialized function optimally.
Solution Approach 2:
Different regions of the sealant structure are assigned different properties: the first sealant layer (lower layer) has high mechanical strength with filler for impact resistance, while the second sealant layer (upper layer) has smooth, filler-free composition for hermetic sealing. Each layer's local quality is optimized for its specific function.
2Strength
If a sealant with filler is used, then impact resistance is improved, but flowability deteriorates making it difficult to form proper seals
Solution Approach 1:
The sealant is segmented into two layers with different compositions. The first layer contains filler for impact resistance, while the second layer is filler-free to provide excellent flowability for proper sealing formation. This segmentation resolves the contradiction between strength and ease of manufacture.
Solution Approach 2:
The sealant uses composite material structure where the first layer combines filler particles in a sealant matrix for mechanical strength, while the second layer uses pure sealant material for flowability. The composite approach allows optimization of different properties in different layers.
Data Source
AI summary
An organic light-emitting display apparatus capable of preventing permeation of external impurities such as oxygen or water vapor and enhancing impact resistance, and a method of manufacturing the organic light-emitting display apparatus. The organic light-emitting display apparatus includes a first substrate; a display unit disposed on the first substrate; a second substrate disposed over the display unit; and a sealing member by which the first substrate is combined with the second substrate. The sealant includes a first sealant which includes a filler and is spaced apart from the first substrate and the second substrate, and a second sealant which contacts the first substrate and the second substrate and covers at least a part of the first sealant.