Flexible OLED Package Assembly Edge Flow Control
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Solution Overview
Problem
The edge flow of organic layers in flexible OLED displays is difficult to control during ink-jet printing, affecting coating accuracy and display performance due to the weak water and oxygen barrier properties of flexible substrates.
Innovation Solution
A package assembly is created with a base substrate having pattern layers and multiple cladding layers, where the contact angle between the organic layer and the cladding layers is controlled to reduce edge flow, improving printing accuracy and display effect by using inorganic materials with varying water-oxygen barrier abilities and forming methods like plasma enhanced chemical vapor deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the organic layer is fabricated by ink-jet printing, then the organic layer can be deposited on the flexible substrate, but the edge flow is not easy to control, affecting coating accuracy and display effect
Solution Approach 1:
The patent applies local quality by creating different surface energy regions on the cladding layers. The first cladding layer has higher surface energy than the second cladding layer, causing the organic layer material to spread differently in different regions. This localized difference in surface properties controls the edge flow behavior, allowing the material to cover the required area while preventing excessive spreading at the edges, thus improving coating accuracy.
Solution Approach 2:
The patent changes the surface energy parameter of the cladding layers by using different materials or treatments. The first cladding layer is designed with higher surface energy compared to the second cladding layer, which changes the wetting behavior of the organic layer material. This parameter change enables control over the edge flow, allowing precise coating while maintaining complete coverage.
2Adaptability or versatility
If the flexible substrate is used for OLED, then the display flexibility is achieved, but the water and oxygen barrier ability is weak, affecting device lifetime
Solution Approach 1:
The patent uses composite materials by combining multiple cladding layers with different properties on the flexible substrate. The first cladding layer uses an inorganic material providing water and oxygen barrier function, while the second cladding layer uses an organic material providing both barrier and flexibility. This composite structure maintains the flexibility of the OLED while achieving reliable protection against water and oxygen penetration.
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
The controlled contact angles between the organic layer and cladding layers enhance printing accuracy and display performance by minimizing edge flow, thereby improving the overall display effect.
Implementation Method 1
the contact angle between the organic layer and the first cladding layer is larger than the contact angle between the organic layer and the second cladding layer
Implementation Method 2
the film package method for organic light-emitting diode is to fabricate an inorganic layer by vapor deposition method
Data Source
AI summary
This invention discloses a method of manufacturing a package assembly, a package assembly, and a display device. The method includes: providing a base substrate, provided with a first pattern layer and a second pattern layer located outside the first pattern layer; forming a first cladding layer on the base substrate, the first cladding layer covering a second pattern layer and a region surrounded by the second pattern layer; forming a second cladding layer on the first cladding layer, the second cladding layer covering a top portion of the first pattern layer and a region surrounded by the first pattern layer; forming an organic layer on the first cladding layer and the second cladding layer, the organic layer covering the first pattern layer and a region surrounded by the first pattern layer; and forming a third cladding layer on the organic layer and the first cladding layer.