Multi-Sealant Organic Light Emitting Display Device Sealing
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Solution Overview
Problem
Organic light emitting display devices degrade due to oxygen and moisture permeation and have reduced impact resistance over time, necessitating improved sealing and durability.
Innovation Solution
The use of a multi-sealant structure comprising an inorganic first sealant, an organic second sealant, and an organic third sealant around the emission unit, with the third sealant having a different width than the second sealant, to enhance adhesive strength and prevent gas permeation, and the inclusion of insulating layers to prevent exfoliation and improve sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single sealant structure is used to seal the emission unit, then the device structure is simple, but oxygen and moisture permeation occurs and impact resistance is reduced
Solution Approach 1:
The sealant structure is divided into multiple segments: a first sealant (inorganic material) that provides primary sealing and oxygen/moisture barrier, and second and third sealants (organic materials) that provide additional sealing layers and impact resistance. This segmentation allows each sealant to perform its specific function, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The patent uses composite sealing structures combining different materials: inorganic materials (glass frit) for the first sealant provide chemical stability and gas barrier properties, while organic materials for the second and third sealants provide flexibility and impact resistance. This composite approach achieves both high reliability and protects against the complexity issue by using material properties rather than complex geometry.
2Object-affected harmful factors
If an inorganic sealant is used to prevent gas permeation, then oxygen and moisture barrier is improved, but adhesive strength and impact resistance are reduced
Solution Approach 1:
Different regions of the sealing structure have different material properties optimized for their specific functions. The first sealant region provides gas barrier properties, while the second and third sealant regions provide adhesive strength and flexibility. This local differentiation resolves the contradiction by allowing each region to excel at its primary function without compromising overall performance.
Solution Approach 2:
The patent combines inorganic materials (glass frit) with organic sealant materials to create a composite sealing system. The inorganic first sealant provides the gas barrier, while the organic second and third sealants provide adhesive bonding and impact resistance. This composite material approach resolves the contradiction between gas permeation resistance and adhesive strength.
3Ease of manufacture
If the sealant width is uniform around the emission unit, then the manufacturing process is simple, but sealing effectiveness at corners and edges is reduced
Solution Approach 1:
The patent implements non-uniform sealant widths tailored to specific regions: the second sealant has a first width at flat portions and a second width (greater than the first) at corner regions, while the third sealant has varying widths optimized for corner sealing. This local quality differentiation ensures adequate sealing at critical corners and edges without requiring complete redesign of the entire sealing system.
Solution Approach 2:
The patent addresses the two-dimensional sealing challenge by introducing dimensional variations in sealant width across different regions. By varying the width dimension of the sealant at corners versus flat portions, the patent enhances sealing effectiveness at critical locations while maintaining a relatively simple overall structure that doesn't require complex three-dimensional geometries.
Data Source
AI summary
Provided is an organic light emitting display device sealed maintaining durability by preventing permeation of oxygen and moisture and improving impact resistance. The light emitting display device includes a first substrate; a second substrate disposed facing toward the first substrate; an emission unit disposed between the first substrate and the second substrate and comprising a plurality of light emitting devices; a first sealant disposed between the first substrate and the second substrate, and surrounding the emission unit and combining the first substrate and the second substrate; a first region formed between around a flat portion of the first sealant and a margin of the second substrate; a second region formed between around a corner of the first sealant and a margin of the second substrate; a second sealant disposed in the first region; and a third sealant disposed in the second region.