Colored Curable Composition for Color Filter Pigment Dispersion
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Solution Overview
Problem
Current pigment dispersion systems for color filters in liquid crystal display devices and solid-state image pickup devices face challenges with coarse particles causing uneven color and decreased light transmittance, leading to reduced contrast and curing sensitivity, while dyes offer inferior light resistance and stability.
Innovation Solution
A colored curable composition comprising a complex with a dipyrromethene compound, a phthalocyanine pigment, a dispersing agent, a polymerizable compound, a photopolymerization initiator, and an organic solvent, which improves particle dispersion and stability, enhancing light resistance and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pigment dispersion system is used for color filter preparation, then light resistance and stability are improved, but coarse particles cause uneven color and decreased light transmittance
Solution Approach 1:
The patent changes the particle size parameter of the pigment from conventional coarse particles to ultra-fine particles with average particle sizes of 0.1 to 1.0 μm. This parameter change resolves the contradiction by maintaining the light resistance of pigments while eliminating the coarse particle effects that cause color unevenness and reduced light transmittance.
Solution Approach 2:
The patent uses composite materials by combining ultra-fine pigments with specific photosensitive composition matrices. The composite structure allows the pigment particles to be uniformly distributed at ultra-fine scales within the photosensitive material, achieving both the light resistance of pigments and the color uniformity required for high-definition displays.
2Manufacturing precision
If pigment particle size is reduced to improve contrast and light transmittance, then color uniformity is improved, but curing sensitivity during pattern exposing is decreased
Solution Approach 1:
The patent optimizes the particle size parameter to a specific range of 0.1 to 1.0 μm, which is large enough to maintain good light scattering properties for contrast but small enough to ensure uniform color distribution. This optimized parameter range simultaneously improves color uniformity while maintaining adequate curing sensitivity.
Solution Approach 2:
The patent develops composite photosensitive compositions that incorporate ultra-fine pigments with enhanced photosensitive matrices. The composite material design compensates for the reduced curing sensitivity of ultra-fine particles by improving the overall photosensitivity of the composition, enabling both high color uniformity and efficient pattern exposing.
3Manufacturing precision
If dyes are used instead of pigments to achieve finer particle size, then color uniformity and light transmittance are improved, but light resistance and stability deteriorate
Solution Approach 1:
The patent uses composite materials by combining ultra-fine pigments with specific photosensitive composition matrices. The composite structure allows the pigment particles to be uniformly distributed at ultra-fine scales within the photosensitive material, achieving both the light resistance of pigments and the color uniformity required for high-definition displays.
Solution Approach 2:
The patent changes the particle size parameter of the pigment from conventional coarse particles to ultra-fine particles with average particle sizes of 0.1 to 1.0 μm. This parameter change resolves the contradiction by maintaining the light resistance of pigments while eliminating the coarse particle effects that cause color unevenness and reduced light transmittance.
4Reliability
If conventional pigment dispersion is used, then light resistance is maintained, but coarse particles cause decreased contrast and resolution
Solution Approach 1:
The patent applies parameter changes by reducing the pigment particle size to the ultra-fine range of 0.1 to 1.0 μm. This dramatic reduction in particle size eliminates the scattering and absorption effects of coarse particles, thereby improving contrast and enabling high-resolution patterning while preserving the inherent light resistance of pigment-based systems.
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 improved light resistance, stability, and contrast by effectively dispersing pigments, reducing particle size, and maintaining high definition, suitable for fine patterns in color filters.
Implementation Method 1
a photopolymerization initiator
Data Source
AI summary
A colored curable composition including at least (A-1) a complex including a compound represented by the following formula (I) and a metal atom or a metal compound, (A-2) a phthalocyanine pigment, (B) a dispersing agent, (C) a polymerizable compound, (D) a photopolymerization initiator, and (E) an organic solvent:wherein R1 to R6 each independently represent a hydrogen atom or a substituent, but R1 and R6 do not bond to each other to form a ring structure; and R7 represents a hydrogen atom, a halogen atom, an alkyl group, an aryl group or a heterocyclic group.