Flexible Display Adhesion Layer Curing for Foldable Bonding Reliability
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Solution Overview
Problem
Existing flexible display devices face challenges in ensuring reliable adhesion and coating properties of adhesive resins during folding and bending operations, particularly in multi-media apparatuses like televisions and mobile phones, due to the need for enhanced coating properties and suitability for various configurations.
Innovation Solution
A manufacturing method involving multiple cycles of applying and curing resin compositions with controlled application amounts and viscosities, including inkjet printing, to form an adhesion member with distinct regions and peak parts, ensuring robust bonding of display panels and windows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive resin is applied to flexible display device components, then adhesion between components is achieved, but coating properties and adhesion reliability deteriorate during folding and bending operations
Solution Approach 1:
The patent applies different resin compositions with different viscosities to different regions of the substrate. A first resin composition with viscosity of 10-30 mPa·s is applied to a first region, and a second resin composition with viscosity of 5-20 mPa·s is applied to a second region. This local differentiation of material properties ensures optimal adhesion and coating stability in different areas during folding and bending operations.
Solution Approach 2:
The patent controls the viscosity parameter of the resin compositions within specific ranges (10-30 mPa·s for first resin, 5-20 mPa·s for second resin) to achieve both good coating properties and adhesion reliability. By precisely controlling this physical parameter, the adhesive maintains its effectiveness during dynamic folding and bending operations while ensuring stable coating application.
2Strength
If multiple resin compositions are applied in sequence, then adhesion strength is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent divides the adhesion structure into multiple segments by applying different resin compositions to different regions. The first resin composition is applied to a first region and the second resin composition is applied to a second region, creating a segmented adhesive structure that provides enhanced adhesion strength while maintaining manageable manufacturing complexity through regional differentiation.
Solution Approach 2:
The patent applies the first resin composition and cures it to form a preliminary adhesion layer before applying the second resin composition. This preliminary action creates a stable base layer that simplifies the subsequent application of the second resin, reducing overall process complexity while achieving strong cumulative adhesion.
3Strength
If resin viscosity is increased to improve adhesion, then bonding strength increases, but coating uniformity and applicability decrease
Solution Approach 1:
The patent optimizes the viscosity parameter within specific ranges (10-30 mPa·s for first resin, 5-20 mPa·s for second resin) to achieve the optimal balance between bonding strength and coating uniformity. This precise parameter control ensures that the resin maintains adequate viscosity for strong bonding while remaining fluid enough for uniform coating application.
Solution Approach 2:
The patent applies resin compositions with different viscosity characteristics to different regions, with the first resin having viscosity of 10-30 mPa·s and the second resin having viscosity of 5-20 mPa·s. This local quality differentiation allows each region to have optimal viscosity for its specific bonding requirements while maintaining overall coating uniformity across the entire substrate.
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 method enhances the reliability and durability of adhesion members in flexible display devices, allowing for seamless folding and bending operations while maintaining optimal coating properties and adhesion.
Implementation Method 1
providing a first light to cure the first resin composition
Implementation Method 2
providing second light to cure the second resin composition
Data Source
AI summary
A method for manufacturing a display device including applying (e.g., depositing) a substrate, in which a first region and a second region around (e.g., surrounding) the first region are defined, on a stage is provided. The method includes forming an adhesion member on the substrate, wherein the forming of the adhesion member includes applying a first resin composition onto the substrate to overlap the first region and the second region, providing first light to cure the first resin composition, applying a second resin composition onto the cured first resin composition to overlap the second region, and providing second light to cure the second resin composition, and each of the first resin composition and the second resin composition has a viscosity of at least about 10 millipascal second (mPa·s) (or greater) and at most about 30 mPa·s (or less) at about 25° C.