Ink Composition for Color Filter Pixels via Hansen Solubility
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Solution Overview
Problem
Current methods for producing color filter pixel units using light-emitting nanocrystal particles face challenges in achieving high external quantum efficiency and efficient material usage, particularly due to waste of expensive resist materials during photolithography and difficulties in achieving both high ejection stability and curability with ink jet methods.
Innovation Solution
An ink composition comprising light-emitting nanocrystal particles, light-diffusing particles, and specific monomers with Hansen solubility parameters that ensure good miscibility, along with a photopolymerization initiator and polymer dispersant, is developed to form a color filter pixel unit with high external quantum efficiency, suitable for use in ink jet methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography method is used to produce color filter pixel units, then manufacturing precision can be achieved, but resist materials including expensive light-emitting nanocrystal particles are wasted
Solution Approach 1:
The patent changes the material parameters by using curable monomers with specific Hansen solubility parameters (δd: 16.0-18.0 MPa^0.5, δp: 2.5-5.5 MPa^0.5, δh: 2.5-8.0 MPa^0.5) instead of traditional photolithography resist materials. This parameter change enables direct inkjet printing of pixel units without wasteful photolithography processes, achieving both precision and material efficiency.
Solution Approach 2:
The patent replaces the mechanical/chemical photolithography system with an inkjet printing system that directly deposits curable monomer compositions. This substitution eliminates the need for photolithography resist materials and their associated waste, while maintaining pixel unit formation capability through controlled inkjet deposition and subsequent curing.
2Loss of substance
If ink jet method is used to form pixel units, then material waste is reduced, but achieving both high ejection stability and high curability is difficult
Solution Approach 1:
The patent optimizes multiple parameters of the curable monomer composition including Hansen solubility parameters (δd: 16.0-18.0 MPa^0.5, δp: 2.5-5.5 MPa^0.5, δh: 2.5-8.0 MPa^0.5), viscosity (5-40 mPa·s at 23°C), and surface tension (20-40 mN/m). These parameter optimizations enable the ink to achieve both high ejection stability from the inkjet system and high curability after deposition, resolving the reliability contradiction.
Solution Approach 2:
The patent uses composite material formulations containing light-emitting nanocrystal particles suspended in curable monomers with specific Hansen solubility parameters. This composite structure maintains ejection stability through proper rheological properties while ensuring high curability through the photopolymerizable monomer components, achieving both requirements simultaneously.
3Ease of manufacture
If traditional curable resist materials are used, then color filter pixel units can be produced, but external quantum efficiency is insufficient for lower power consumption
Solution Approach 1:
The patent changes the material composition from traditional organic pigment-based resist materials to light-emitting nanocrystal particles with specific optical parameters. These nanocrystals exhibit superior photoluminescence efficiency, directly improving external quantum efficiency and reducing power consumption while maintaining ease of manufacture through inkjet printing and photopolymerization processes.
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 ink composition effectively enhances external quantum efficiency and ejection stability, reducing material waste and improving the reliability of color filter pixel units, while being compatible with ink jet methods for more efficient production.
Implementation Method 1
The ink composition may further contain a photopolymerization initiator
Implementation Method 2
light-emitting nanocrystal particles, such as quantum dots, quantum rods, or other inorganic fluorescent particles
Implementation Method 3
light-diffusing particles
Data Source
AI summary
There is provided an ink composition that can form a color filter pixel unit with high external quantum efficiency. An ink composition containing light-emitting nanocrystal particles, light-diffusing particles, and at least two monomers with an ethylenically unsaturated group, wherein the at least two monomers include two monomers with Hansen solubility parameters δd, δp, and δh that satisfy the following conditions: 16.0 MPa0.5≤δd<18.0 MPa0.5; 2.5 MPa0.5≤δp<5.5 MPa0.5; 2.5 MPa0.5≤δh<8.0 MPa0.5.