Organic Electroluminescent Display Panel Sealing Structure
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Solution Overview
Problem
The existing organic electroluminescent display panels face deterioration due to external water and oxygen infiltration through the sealant, which reduces their service life.
Innovation Solution
The solution involves a package cover plate with a first groove for the organic electroluminescent structure and at least one second groove for a curable sealant, along with a metal layer between protrusions of the package cover plate and the base substrate, ensuring a tight seal and enhanced adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealant is used to bond package cover plate and base substrate, then bonding is achieved, but water and oxygen infiltration occurs due to molecular gaps in cured sealant
Solution Approach 1:
The sealing structure is divided into multiple functional layers: a first sealant layer for initial bonding, a metal layer for barrier function, and a second sealant layer for enhanced sealing. This segmentation allows each layer to perform its specific function, with the metal layer specifically addressing the water and oxygen infiltration problem caused by molecular gaps in sealant alone.
Solution Approach 2:
The patent uses a composite sealing structure combining organic sealant materials with inorganic metal layer. This composite approach leverages the adhesive properties of sealant and the impermeable barrier properties of metal, effectively preventing water and oxygen infiltration while maintaining bonding functionality.
2Object-affected harmful factors
If metal layer is added between package cover plate and base substrate, then water and oxygen blocking is improved, but device complexity increases
Solution Approach 1:
The sealing and barrier functions are merged into a single integrated multilayer structure. The first sealant layer, metal layer, and second sealant layer work together as a unified sealing system, where the metal layer is embedded within the sealant layers rather than being a separate component. This integration reduces device complexity while maintaining effective water and oxygen blocking.
3Ease of manufacture
If conventional sealing method is used, then fabrication is simple, but service life is reduced due to organic electroluminescent structure deterioration
Solution Approach 1:
The metal layer is deposited on the protrusion portions of the package cover plate before final assembly, creating a pre-formed barrier structure. This preliminary action ensures that the water and oxygen blocking capability is established before the organic electroluminescent structure is fully assembled, preventing deterioration from the outset and extending service life without complicating the overall fabrication process.
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
This configuration effectively blocks external water and oxygen, enhances the seal performance of the display panel, and reduces the thickness and cost of the metal layer, thereby extending the panel's lifespan and improving fabrication efficiency.
Implementation Method 1
a curable sealant is filled in an space enclosed by the at least one second groove and a surface of the base substrate to seal the package cover plate and the base substrate
Implementation Method 2
a metal layer is located between a protrusion portion of the package cover plate and the base substrate
Data Source
AI summary
An organic electroluminescent display panel, a fabrication method thereof, and a display device are provided. The organic electroluminescent display panel includes: a base substrate and a package cover plate disposed opposite to each other, and an organic electroluminescent structure disposed on the base substrate and provided between the base substrate and the package cover plate. The package cover plate has a first groove for accommodating the organic electroluminescent structure within a display region of the organic electroluminescent display panel; the package cover plate has at least one second groove surrounding the first groove and having a closed boundary within a non-display region of the organic electroluminescent display panel; the second groove accommodates a sealant; and a metal layer is located between a protrusion portion of the package cover plate and the base substrate.