Dye-Resin Coloring Composition for High-Resolution Color Filters
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Solution Overview
Problem
The existing pigment dispersion method for producing color filters, particularly for high-resolution applications, faces challenges such as color unevenness due to pigment aggregation, low light and heat resistance of dyes, solubility issues in solvents, and difficulties in adjusting dye solubility in radiation-sensitive compositions, leading to coating defects and poor color separation.
Innovation Solution
A coloring composition with a resin having a dye structure, where the molecular weight distribution is optimized to minimize high-molecular-weight components, combined with a pigment, polymerizable compounds, and a photopolymerization initiator, to inhibit residue formation and improve coating quality, and includes an alkali-soluble resin for enhanced solubility and developability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigments are dispersed in photosensitive compositions to produce color filters, then light resistance and heat resistance are improved, but resolution and pattern fineness deteriorate due to coarse particles from pigment aggregation
Solution Approach 1:
The patent changes the physical state parameter of the colorant from particulate (pigment) to molecular (dye), enabling formation of ultrafine patterns with 1 μm or less thickness while maintaining color saturation. This parameter change resolves the contradiction by eliminating particle aggregation issues inherent in pigment dispersion methods.
Solution Approach 2:
The patent creates a composite radiation-sensitive coloring composition integrating dye molecules with polymerizable compounds and photopolymerization initiators. This composite structure enables the dye to function both as a colorant and as part of the photosensitive system, achieving high resolution while maintaining light resistance through the stability of the polymerized matrix.
2Manufacturing precision
If dyes are used instead of pigments to improve resolution, then pattern fineness is improved, but light resistance and heat resistance deteriorate
Solution Approach 1:
The patent merges the dye molecule with polymerizable functional groups, combining the advantages of dyes (fine pattern formation) with the advantages of polymers (light and heat resistance). The resulting polymerized dye structure maintains the optical properties of dyes while gaining the stability of crosslinked polymer networks.
Solution Approach 2:
The patent ensures continuous protection of the dye through polymerization, where the polymerized structure continuously provides light and heat resistance. The crosslinked network structure maintains the dye's positional stability and prevents degradation over time, ensuring continuous useful action.
3Manufacturing precision
If dyes are used in radiation-sensitive compositions, then pattern fineness is improved, but solubility in solvents deteriorates making composition design difficult
Solution Approach 1:
The patent changes the solubility parameter by introducing polymerizable functional groups to the dye structure. The dye transitions from being soluble in traditional solvents to being soluble in polymerizable monomers, enabling easy composition design while maintaining fine pattern formation capability.
Solution Approach 2:
The patent uses polymerizable compounds as intermediaries to bridge the dye and the final polymerized structure. The dye dissolves in the polymerizable monomer during composition preparation, and upon photopolymerization, forms a stable crosslinked network, facilitating ease of manufacture throughout the process.
4Illumination intensity
If large amounts of dye are added to achieve desired absorption in thin films, then color saturation is improved, but curability and heat resistance deteriorate due to reduced amounts of other components
Solution Approach 1:
The patent merges the dye structure with polymerizable functional groups, allowing the dye to serve dual purposes: providing color saturation and participating in photopolymerization. This eliminates the need to add separate polymerizable compounds in large amounts, maintaining curability while achieving high color saturation.
Solution Approach 2:
The patent makes the dye multi-functional by incorporating polymerizable groups directly into its structure. The dye molecule simultaneously functions as a colorant and as a monomer unit in the polymer network, providing both color saturation and contributing to curability and heat resistance of the final product.
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 prevents residue formation on other colors, reduces coating defects, and achieves excellent color separation and stability, enabling the production of high-resolution color filters with improved light and heat resistance.
Implementation Method 1
a radiation-sensitive coloring composition is coated onto a substrate by using a spin coater, a roll coater, or the like, followed by drying to form a coating film, and the coating film is developed by pattern exposure
Data Source
AI summary
A coloring composition is provided which is less likely to remain on a pattern of other colors as residues and can inhibit occurrence of coating defects. Also provided are a colored pattern, a color filter, a method of producing a color filter, a pattern forming method, a solid-state imaging device, and an image display device, each using the coloring composition. The coloring composition contains a resin (A) having a dye structure, in which in the peak area of the total molecular weight distribution of the resin (A) as measured by gel permeation chromotography, the proportion of the peak area of a component having a molecular weight of 20,000 or more is 10% or less.