OLED Package Structure Recesses and Composite Sealing
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Solution Overview
Problem
Conventional OLED package technologies face issues with curing defects, porosity, and weak binding forces, allowing water vapor and oxygen to penetrate, which decreases the performance and lifespan of OLED devices, and limits the ability to form narrow frames and increase the area of display panels.
Innovation Solution
The OLED package structure features recesses formed by bending the structure layers, with a desiccant layer placed between the sealant and the luminous layer to create space and prevent moisture ingress, and rounded curving structures to enhance sealing, allowing for a frameless design that increases the display panel area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UV curing package technology is used, then curing speed is fast and energy consumption is low, but the sealant has curing defects, porosity, and weak binding force allowing water vapor and oxygen to penetrate
Solution Approach 1:
The patent uses a composite sealing structure combining organic UV curing sealant with inorganic sealing materials (glass frit, metal sealant, or oxide coating). This composite approach leverages the fast curing speed of UV sealant while the inorganic materials provide superior moisture and oxygen barrier properties, resolving the contradiction between curing efficiency and sealing reliability.
Solution Approach 2:
The patent employs a multi-layer thin film sealing structure where the UV curing sealant forms a flexible sealing layer that can accommodate substrate expansion and contraction, while inorganic thin films provide the barrier function. This flexible multi-layer structure maintains sealing integrity without compromising the fast curing advantage.
2Reliability
If the sealant coating weight is increased to prevent moisture entry, then sealing performance improves, but the frame width increases and display panel area decreases
Solution Approach 1:
By combining organic sealant with inorganic sealing materials having superior moisture barrier properties, the patent achieves effective moisture prevention with a thinner overall sealant layer. This reduces the frame width while maintaining sealing performance, thereby increasing the display panel area.
Solution Approach 2:
The patent applies different sealing materials with different functions in different locations and layers: the UV curing sealant provides flexible adhesion and initial sealing, while inorganic materials provide the moisture barrier. This localized functional distribution allows thin-frame design without compromising moisture prevention.
3Ease of manufacture
If conventional sealant is used, then the package can be sealed, but the binding force between substrate and package cover is weak allowing water vapor and oxygen to reach the inside
Solution Approach 1:
The patent creates a composite sealing system where the UV curing sealant provides strong adhesive bonding between substrate and package cover, while inorganic sealing materials (glass frit, metal sealant, or oxide coating) provide enhanced mechanical strength and environmental barrier. This composite structure simultaneously achieves ease of manufacture through UV curing and superior binding strength.
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 design effectively prevents moisture and oxygen from reaching the luminous layer, enhancing the lifespan and performance of OLED devices while allowing for a larger display area by eliminating frames on the package structure.
Implementation Method 1
a desiccant layer is disposed in the recesses, and the desiccant layer is located between the sealant and the luminous layer
Data Source
AI summary
An organic light emitting diode package structure includes a first structure layer, a second structure layer, and a luminous layer disposed between the first structure layer and the second structure layer. Two recesses are formed by bending two respective opposite ends of the first structure layer. End sections of the second structure layer and the luminous layer are located in the two recesses. One of the first structure layer and the second structure layer is a substrate base layer, and the other is a package layer. An area of a display panel is thus increased.