Porous Dam Member Sealing for OLED Moisture Protection
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Solution Overview
Problem
Organic light emitting display devices face mechanical reliability issues due to thinness, which can lead to sealing defects from moisture and oxygen infiltration, especially when impacted or distorted, as the inorganic sealant is prone to contamination and release.
Innovation Solution
An organic light emitting display device design featuring a primary dam member, a filler, and an auxiliary dam member made of porous material, with an inorganic sealant jointed to the substrates, effectively blocking moisture and oxygen infiltration and preventing sealant contamination by absorbing any overflowing filler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the thickness of the organic light emitting display device is reduced, then the device meets user demand for thinner displays, but the mechanical reliability deteriorates making the device susceptible to damage from impact or distortion
Solution Approach 1:
The patent employs a multi-layer sealing structure consisting of thin film dam members and sealant layers that provide robust sealing and mechanical protection despite the overall thinness of the display device. The dam member and sealant form a flexible yet protective barrier that maintains sealing integrity under impact or distortion conditions.
2Reliability
If the sealant material is chosen to provide good sealing, then moisture and oxygen protection is improved, but the inorganic sealant is prone to contamination by filler material during the sealing process
Solution Approach 1:
The patent divides the sealing space into multiple regions using a dam member structure. The dam member creates a first region for filler material and a second region for the inorganic sealant, physically separating these materials during the sealing process. This segmentation prevents filler contamination of the sealant while maintaining effective sealing performance.
Solution Approach 2:
The dam member acts as an intermediary barrier between the filler material and the inorganic sealant. It controls the flow and positioning of filler material, preventing it from contaminating the sealant region while still allowing the sealant to perform its moisture and oxygen blocking function effectively.
3Duration of action of stationary object
If the organic light emitting elements are protected from moisture and oxygen, then the lifespan is extended, but the organic material remains vulnerable to attack from moisture and oxygen infiltration
Solution Approach 1:
The patent uses a composite sealing structure combining organic dam members with inorganic sealant materials. This composite approach leverages the advantages of both material types: the organic dam member provides structural integrity and flexibility, while the inorganic sealant provides superior moisture and oxygen blocking properties, thereby extending the lifespan of the organic light emitting elements.
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
Enhances mechanical reliability and lifespan by preventing sealant contamination and maintaining the integrity of the inorganic sealant, thus reducing sealing defects and improving pressure resistance.
Implementation Method 1
an auxiliary dam member between the first substrate and the second substrate and in a second region outside the first region, the auxiliary dam member being composed of porous material
Data Source
AI summary
An organic light emitting display device, including: a first substrate on which a plurality of light emitting elements are formed; a second substrate that is disposed to be opposed to the first substrate; a primary dam member that is provided between the first substrate and the second substrate in order to surround the plurality of light emitting elements; a filler that is filled between the first substrate and the second substrate and in a first region defined by the primary dam member, an auxiliary dam member that is between the first substrate and the second substrate and in a second region outside the first region, and is made of porous material; and an inorganic sealant that is provided between the first substrate and the second substrate and in a third region outside the first region and the second region, and is jointed to the first substrate and the second substrate.