Quantum Dot Ink Composition for EHD Printing and Fine Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing quantum dot compositions for electrohydrodynamic inkjet printing require low viscosity, making it difficult to apply higher viscosity inks, and conventional methods lead to material waste and increased manufacturing costs due to the use of high-quality materials in non-desired areas.
Innovation Solution
A quantum dot composition with a viscosity of 5000 cps or less, suitable for EHD inkjet methods, incorporating quantum dots, photopolymerizable monomers, oligomers, and ligands to enhance dispersibility and adhesion, allowing for fine patterning and reduced material waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If quantum dot composition is formulated for conventional inkjet printing, then material utilization is improved, but viscosity becomes too high (>100 cps) for proper inkjet application
Solution Approach 1:
The patent changes the chemical composition parameters of the binder system by using a specific combination of reactive diluent (5-50 wt%), oligomer (30-60 wt%), and photopolymerizable monomer (10-40 wt%). This parameter optimization achieves the target viscosity range of 10-100 cps while maintaining quantum dot stability and optical properties, resolving the contradiction between material utilization and viscosity control.
2Ease of operation
If viscosity is reduced to enable inkjet printing, then ink jettability is improved, but optical properties and light absorption may deteriorate
Solution Approach 1:
The patent creates a composite binder system combining reactive diluent, oligomer, and photopolymerizable monomer in specific ratios. This composite approach allows the formulation to achieve low viscosity (10-100 cps) for good ink jettability while the oligomer and monomer components maintain quantum dot dispersion and optical properties, including light absorption of 80% or more in the cured product.
3Device complexity
If conventional spin coating or slip coating is used for patterning, then manufacturing process is simplified, but material waste increases due to non-desired area deposition
Solution Approach 1:
The patent replaces the mechanical deposition method (spin coating/slip coating) with electrohydrodynamic inkjet printing. This substitution uses an electric field to control ink ejection and deposition, enabling precise patterning that deposits quantum dot composition only in desired pixel areas, thereby reducing material waste while maintaining manufacturing feasibility.
4Manufacturing precision
If electrohydrodynamic inkjet printing is implemented, then material precision and reduced waste are achieved, but viscosity must be controlled within specific range for proper ejection
Solution Approach 1:
The patent optimizes the viscosity parameter to a specific range of 10-100 cps through careful formulation of the binder system. This parameter control ensures the quantum dot composition can be properly ejected via electrohydrodynamic inkjet printing, achieving fine patterning precision while maintaining compositional stability and printability.
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 composition achieves excellent optical properties, inkjetability, and reduced material waste while maintaining high adhesion and flexibility, enabling efficient and cost-effective manufacturing of display devices.
Implementation Method 1
a photopolymerizable monomer
Implementation Method 2
produce various colors by emitting light of different wavelengths depending on particle size
Implementation Method 3
electrohydrodynamic (EHD) inkjet printing that enables fine patterning has been developed. The EHD inkjet methods enable miniaturization and printing of ink according to an electric field by applying an electric potential difference between a nozzle ejecting the ink and a substrate.
Data Source
Figure 1~2
AI summary
Provided are a quantum dot composition, a method of manufacturing the same, a cured product thereof, and a display device including the same, specifically a quantum dot composition for electrohydrodynamic inkjet printing, a method of manufacturing the same, a cured product thereof, and a display device including the same.