Curable Composition for Color Filter Uniform Curing
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Solution Overview
Problem
The existing photosensitive resin compositions used for manufacturing cured films in applications like color filters and solid-state imaging elements do not achieve the desired pattern shape quality, leading to variations in the pattern shape and increased line width roughness due to non-uniform curing, especially when a high content of colorant hinders energy propagation.
Innovation Solution
A curable composition comprising a resin with a curable group, a colorant, a polymerization inhibitor, and a photopolymerization initiator, where the resin contains ethylenically unsaturated groups, structural units with acidic groups, and a black pigment, optimized to ensure uniform curing and improved patterning properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a high content of colorant is used in the curable composition, then the optical density and light blocking performance are improved, but the energy propagation is hindered causing non-uniform curing and increased line width roughness
Solution Approach 1:
The patent changes the chemical parameters of the resin by introducing specific structural units (Formula A1 and Formula B1) with ethylenically unsaturated groups and acidic groups. This modification allows the resin to maintain proper flow and curing characteristics even with high colorant content, enabling uniform energy propagation and consistent pattern formation while preserving light blocking performance
Solution Approach 2:
The patent creates a composite curable composition combining specifically designed resin structures (with both ethylenically unsaturated and acidic groups) with colorants and polymerization inhibitors. This composite formulation achieves synergistic effects where the resin structure compensates for the harmful impact of high colorant content on energy propagation, maintaining both optical density and pattern precision
2Object-affected harmful factors
If the curable composition is designed for high optical density with colorant, then the light blocking ability is enhanced, but the curing uniformity deteriorates leading to variation in pattern shape
Solution Approach 1:
The patent modifies the resin's chemical parameters by incorporating structural units with both ethylenically unsaturated groups (for polymerization) and acidic groups (for stability and uniformity). This dual-functional structure enables the composition to maintain curing uniformity despite high colorant content that would otherwise cause non-uniform energy distribution and inconsistent pattern formation
Solution Approach 2:
The specifically structured resin acts as an intermediary between the photopolymerization initiator and the colorant. It facilitates uniform energy distribution and controlled polymerization throughout the composition, mediating the interaction between light, initiator, and colorant to achieve both high optical density and consistent curing across the patterned film
3Object-affected harmful factors
If a pattern-like cured film is formed with high colorant content, then the optical density is improved, but the line width roughness increases due to non-uniform curing
Solution Approach 1:
The patent changes the resin's molecular parameters by introducing structural units with ethylenically unsaturated groups that enable controlled polymerization and acidic groups that enhance stability. This parameter modification allows the system to achieve uniform curing even with high colorant content, producing smooth line widths and consistent pattern dimensions while maintaining high optical density
Solution Approach 2:
The patent applies local quality by ensuring that the resin structure provides uniform polymerization characteristics throughout the entire patterned region. The specific structural units (Formula A1 and Formula B1) create consistent local curing conditions across different areas of the pattern, preventing variations in line width roughness and ensuring uniform pattern formation from edge to edge
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 curable composition achieves excellent patterning properties with reduced line width roughness and improved image quality by ensuring uniform polymerization and effective energy propagation, even with high colorant content, resulting in a cured film with enhanced optical density and stability.
Implementation Method 1
a curable composition comprising a resin containing a curable group, a colorant, a polymerization inhibitor, and a polymerization initiator
Data Source
AI summary
A curable composition contains a resin containing a curable group, a colorant, a polymerization inhibitor, and a polymerization initiator. A manufacturing method of the curable composition includes a colorant dispersing step of mixing together the resin containing a curable group, the colorant, and the polymerization inhibitor and a mixing step of mixing together the colorant dispersion and the polymerization initiator so as to obtain the curable composition. A cured film is obtained by curing the curable composition. A color filter, a solid-state imaging element, and an infrared sensor have the cured film. A manufacturing method of the cured film includes a curable composition layer-forming step, an exposure step, and a development step.