Quantum Dot Light Scattering Particle Composite for Inkjet Printing
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Solution Overview
Problem
Light scattering particles in traditional quantum dot inks for QD-LED displays agglomerate and block inkjet printer nozzles, affecting the manufacturing process due to poor dispersion in acrylic inks.
Innovation Solution
A manufacturing method for a display panel involving a quantum dot light scattering particle composite, where oil phase quantum dots are attached to the surfaces of light scattering particles like titanium dioxide or silicon oxide, improving dispersion stability in a lipophilic solvent-based inkjet printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light scattering particles (e.g., TiO2) are added to traditional acrylic quantum dot inks to increase optical path length and brightness conversion efficiency, then the optical performance is improved, but the particles cannot be well dispersed and will slowly agglomerate to block inkjet printer nozzles
Solution Approach 1:
The patent changes the solvent parameter from traditional acrylic (water-based) to lipophilic solvent (oil-based), which fundamentally alters the dispersion characteristics. This parameter change enables light scattering particles to be stably dispersed without agglomeration, while maintaining good adhesion to substrates and compatibility with inkjet printing processes
Solution Approach 2:
The patent creates a composite ink formulation combining quantum dots, light scattering particles, and lipophilic solvent. This composite material system achieves synergistic effects where the lipophilic environment enables stable dispersion of both quantum dots and light scattering particles, preventing nozzle blockages while maintaining optical performance
2Productivity
If light scattering particles are added to increase optical path length, then the light conversion efficiency is improved, but the particles block inkjet printer nozzles during the printing process
Solution Approach 1:
Changing the solvent type to lipophilic solvent fundamentally improves the flow and dispersion characteristics of the ink. This parameter change prevents particle agglomeration that would otherwise block nozzles, ensuring smooth inkjet printing while maintaining high light conversion efficiency through proper particle dispersion
Solution Approach 2:
The lipophilic solvent acts as an intermediary medium that facilitates stable dispersion of light scattering particles. This intermediary enables the particles to remain individually dispersed during printing, preventing nozzle blockages while still providing the desired light scattering effect for enhanced conversion efficiency
3Ease of manufacture
If traditional acrylic inks are used for quantum dot deposition, then the printing process is simple, but the light scattering particles cannot be stably dispersed
Solution Approach 1:
The patent changes the solvent parameter from acrylic to lipophilic solvent, which fundamentally improves particle dispersion stability. This parameter change maintains printing process simplicity while enabling stable dispersion of light scattering particles throughout the ink formulation
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 dispersion stability of light scattering particles, increasing the optical path length of blue light and brightness conversion efficiency in the quantum dot light conversion layer, while preventing nozzle blockages and ensuring smooth printing.
Implementation Method 1
The quantum dot light conversion layer is configured to receive and be excited by blue light to emit at least red light and green light
Implementation Method 2
TiO2 has a good scattering effect, but it cannot be well dispersed in traditional acrylic inks
Data Source
AI summary
The present application provides a display panel and a manufacturing method thereof. Quantum dot ink is prepared by dispersing a quantum dot light scattering particle composite in a dispersion medium. The quantum dot light scattering particle composite includes light scattering particles and oil phase quantum dots attached to surfaces of the light scattering particles. Oil solubility of the oil phase quantum dots is used to increase dispersion stability of the light scattering particles in the dispersion medium to satisfy process requirements of inkjet printing.