Radiation-Sensitive Colored Composition for Color Filter Pattern Precision
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Solution Overview
Problem
Conventional pigment dispersion methods for producing color filters, especially for solid state image devices, face challenges with fine pattern precision due to pigment aggregation, leading to color unevenness and inadequate solvent resistance, heat resistance, and light resistance.
Innovation Solution
A radiation-sensitive colored composition comprising a colorant multimer, a polymerizable compound, a photopolymerization initiator, and an organic solvent, with a low content of inorganic metal salt, which reduces color transfer and aggregation, enhancing developability, heat resistance, and solvent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pigment dispersion method is used to produce color filters, then light resistance and heat resistance are improved, but manufacturing precision deteriorates due to pigment aggregation causing color unevenness in fine patterns
Solution Approach 1:
The pigment particles are divided into smaller ultrafine particles through mechanical energy treatment, breaking down aggregates into individual dispersed particles. This segmentation allows fine patterns to be formed without color unevenness while maintaining the inherent light resistance of pigments.
Solution Approach 2:
The invention introduces a dynamic process of mechanically activating pigment particles using specific energy inputs (ball milling, sand milling, or jet milling) to transform aggregated pigment into uniformly dispersed ultrafine particles. This dynamic treatment resolves the static aggregation problem while preserving pigment stability.
2Stability of the object's composition
If pigment particles are aggregated to improve stability, then preservation stability is improved, but manufacturing precision deteriorates due to coarse particles causing color unevenness
Solution Approach 1:
The pigment particles are pre-treated by mechanical energy input before coating to achieve ultrafine dispersion. This preliminary action of breaking down aggregates ensures that when the composition is later applied and cured, the fine patterns form uniformly without color unevenness, while the cured film maintains preservation stability.
Solution Approach 2:
The particle size parameter of the pigment is changed from aggregated coarse particles to ultrafine particles through mechanical energy treatment. This parameter change enables fine pattern formation with high precision while the cured film maintains stability through the photopolymerization process.
3Ease of manufacture
If conventional pigment dispersion is used, then ease of manufacture is improved, but manufacturing precision deteriorates making it difficult to achieve smaller pattern sizes
Solution Approach 1:
A dynamic mechanical treatment process is introduced to conventional pigment dispersion, using ball milling, sand milling, or jet milling to create ultrafine particles. This dynamic step maintains ease of manufacture by using standard equipment while achieving the precision needed for smaller pattern sizes.
Solution Approach 2:
The particle size distribution parameter is changed through mechanical energy treatment, creating a narrow distribution of ultrafine particles. This parameter change enables the formulation to achieve smaller pattern sizes with high precision while maintaining ease of manufacture through conventional coating and curing processes.
4Manufacturing precision
If dye is used as colorant to accomplish high precision, then manufacturing precision is improved, but reliability deteriorates due to inferior preservation stability, light resistance, and heat resistance
Solution Approach 1:
The invention creates a composite system combining ultrafine pigment particles with photopolymerizable resin and catalyst. This composite material achieves the fine pattern precision of dyes while the pigment particles provide the superior preservation stability, light resistance, and heat resistance that pure dyes lack.
Solution Approach 2:
The particle size parameter of the colorant is changed to ultrafine scale, and the chemical state is changed from molecular dispersion (dye) to particulate dispersion (pigment). This dual parameter change enables achieving dye-like precision while maintaining pigment-like reliability in preservation stability and resistance properties.
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 high precision in forming colored patterns with reduced color unevenness and improved solvent and heat resistance, suitable for micro-size patterns in solid state image devices.
Implementation Method 1
a radiation-sensitive colored composition which includes a colorant multimer (A), a polymerizable compound (B), a photopolymerization initiator (C), and an organic solvent (D)
Data Source
AI summary
Provided is a radiation-sensitive colored composition which exhibits excellent developability, has excellent heat resistance and solvent resistance, and is capable of forming a colored pattern with less color transfer and color unevenness.The radiation-sensitive colored composition includes a colorant multimer (A), a polymerizable compound (B), a photopolymerization initiator (C), and an organic solvent (D), wherein the content of an inorganic metal salt (X) including no colorant skeleton is 0.1% by mass or less with respect to a dye solid contents.