Dye Polymer Coloring Composition for High-Resolution Color Filters
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Solution Overview
Problem
Conventional pigment dispersion methods for color filters in solid-state imaging devices suffer from low resolution and color irregularities due to coarse pigment particles, while dye-based solutions face issues with solubility, interaction with other components, and poor heat and light resistance.
Innovation Solution
A coloring composition comprising a polymer with a dye skeleton and an organic solvent, where the content of unreacted monomer components is limited to less than 1 mass%, and a radiation-sensitive composition including this polymer, a polymerizable compound, and a polymerization initiator, optimized through heat re-precipitation and adjusted polymerization concentration to enhance developability and reduce development residues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pigment dispersion method is used, then light stability and heat resistance are improved, but resolution deteriorates and color irregularity occurs due to coarse particles
Solution Approach 1:
The patent changes the physical state of the coloring agent from particulate (pigment) to molecular/dissolved state (dye), fundamentally altering the parameter of particle size from micrometer scale to molecular scale. This enables high-resolution patterning while maintaining color stability through the use of polymerized dyes that combine the advantages of both pigments and conventional dyes.
Solution Approach 2:
The invention creates a composite radiation-sensitive composition integrating dye polymers with photopolymerization components (polymerizable compounds and photopolymerization initiators). This composite structure allows the dye to be incorporated into a polymer matrix during photolithography, achieving both fine patterning capability and color stability simultaneously.
2Manufacturing precision
If dye is used instead of pigment, then resolution is improved, but solubility deteriorates and interaction with other components occurs
Solution Approach 1:
The patent introduces polymerization components (polymerizable compounds and photopolymerization initiators) as intermediaries that enable the dye to be chemically transformed from a small molecule into a polymer structure. This intermediary process resolves the solubility problem by converting the dye into a form that can be incorporated into the radiation-sensitive composition matrix without precipitation or unwanted interactions.
Solution Approach 2:
The invention changes the molecular weight parameter of the dye from low (monomeric) to high (polymeric) through photopolymerization. This parameter change fundamentally alters the solubility characteristics, allowing the dye to remain stable in the radiation-sensitive composition while maintaining high resolution patterning capability.
3Illumination intensity
If large amount of dye is added to compensate for low molar extinction coefficient, then absorption is improved, but curing property deteriorates and heat resistance decreases
Solution Approach 1:
The patent changes the structural parameter of the dye from monomeric to polymeric form, which increases the molar extinction coefficient per unit mass. This parameter change allows achieving the required absorption with smaller amounts of dye, thereby preserving the curing properties and heat resistance of the radiation-sensitive composition.
4Reliability
If dye polymer is used to improve stability, then light resistance is improved, but developability deteriorates
Solution Approach 1:
The patent applies preliminary action by incorporating the dye polymerization step into the overall photolithography process sequence. The dye polymerizes first to establish stability and color properties, then the subsequent development process removes unreacted components. This preliminary polymerization of the dye enables both light resistance and good developability by separating these functions in the process sequence.
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 solution provides a coloring composition with improved heat resistance, no discoloration, and excellent developability, ensuring high-resolution color filters with minimal development residues on substrates and pixels, suitable for fine patterns in solid-state imaging devices.
Implementation Method 1
a radiation-sensitive composition including this polymer, a polymerizable compound, and a polymerization initiator
Implementation Method 2
optimized through heat re-precipitation and adjusted polymerization concentration
Data Source
AI summary
Disclosed is a coloring composition with satisfactory heat resistance, no discoloration, excellent developability, and no development residues on a substrate and pixels of other colors, providing, a coloring composition for a color filter including (A) a polymer having a dye skeleton and (B) an organic solvent, wherein the content of an unreacted monomer component having the dye skeleton which is capable of forming (A) the polymer having the dye skeleton is less than or equal to 1 mass % with regard to (A) the polymer having the dye skeleton.