Coloring Composition for Color Filter Film Surface Flatness
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Solution Overview
Problem
Existing coloring compositions used in forming color filters for solid image pickup elements and infrared sensors tend to develop corrugated surfaces when thickened, leading to noise from visible rays and reduced transmission of near-infrared rays.
Innovation Solution
A coloring composition with a specific ratio of colorants to polymerizable compounds, including a range of 0.05 to 0.35 for the mass ratio of colorants to polymerizable compounds, and a content of 25 to 65% polymerizable compounds, along with specific absorbance ratios and pigment combinations, is used to form a film that allows near-infrared transmission while minimizing visible noise and corrugation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the film thickness is increased to improve near-infrared transmission, then the near-infrared transmission efficiency is improved, but the surface corrugation becomes more severe
Solution Approach 1:
The patent changes the chemical composition parameters of the coloring composition by specifying precise ratios of polymerizable compounds (25-65 mass%), colorants (0.05 to 0.35 mass ratio to polymerizable compounds), and resins. This compositional parameter adjustment ensures uniform curing throughout the film thickness while suppressing surface corrugation, thereby enabling thick films to maintain both high near-infrared transmission and surface flatness
2Manufacturing precision
If the content of polymerizable compounds is increased to reduce surface corrugation, then the surface flatness is improved, but the curing uniformity deteriorates
Solution Approach 1:
The patent optimizes the parameter of polymerizable compound content within the specific range of 25-65 mass% of total solid content. This parameter setting, combined with the controlled colorant to polymerizable compound mass ratio of 0.05 to 0.35, creates a balanced formulation that achieves both surface flatness and uniform curing throughout the film
Solution Approach 2:
The patent creates a composite coloring composition system integrating polymerizable compounds, colorants, and resins in specific proportions. This composite material approach ensures that the polymerizable compounds provide sufficient curing capability for surface flatness while the resin matrix maintains curing uniformity throughout the film thickness
3Object-affected harmful factors
If the ratio of colorants to polymerizable compounds is increased to enhance visible light absorption, then the noise from visible rays is reduced, but the film surface corrugation increases
Solution Approach 1:
The patent precisely controls the mass ratio of colorants to polymerizable compounds within 0.05 to 0.35, and polymerizable compound content within 25-65 mass% of total solid content. This parameter optimization achieves sufficient visible light absorption for noise reduction while maintaining adequate polymerizable compound content to prevent surface corrugation during curing
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 effectively suppresses corrugation and noise from visible rays, enabling efficient near-infrared transmission and maintaining uniform curing across the film surface and interior, suitable for thick films in color filters and sensors.
Implementation Method 1
a coloring composition which is preferably used for forming a color filter... applying a coloring composition having any one of red, green, and blue colorants to obtain a colored pattern of a first hue; forming a colored pattern by performing exposure, development, and optionally a heat treatment on the applied coloring composition
Implementation Method 2
a ratio A/B of a minimum value A of an absorbance in a wavelength range of 400 nm or longer and shorter than 580 nm to a minimum value B of an absorbance in a wavelength range of 580 nm to 770 nm is 0.3 to 3, and a ratio C/D of a minimum value C of an absorbance in a wavelength range of 400 nm to 750 nm to a maximum value D of an absorbance in a wavelength range of 850 nm to 1300 nm is 5 or higher
Data Source
AI summary
A coloring composition includes colorants, polymerizable compounds, and a resin, in which a ratio P/M of a mass P of the colorants to a mass M of the polymerizable compounds is 0.05 to 0.35, a content of the polymerizable compounds is 25 to 65 mass % with respect to a total solid content of the coloring composition, a ratio A/B of a minimum value A of an absorbance in a wavelength range of 400 nm or longer and shorter than 580 nm to a minimum value B of an absorbance in a wavelength range of 580 nm to 770 nm is 0.3 to 3, and a ratio C/D of a minimum value C of an absorbance in a wavelength range of 400 nm to 750 nm to a maximum value D of an absorbance in a wavelength range of 850 nm to 1300 nm is 5 or higher.