Resin Composition for Color Filter Light-Shielding
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Solution Overview
Problem
Current light-shielding films in display devices face issues with blurring of mask patterns, development residues, and poor reactivity due to high black pigment concentrations, affecting device performance.
Innovation Solution
A resin composition comprising an alkali-soluble resin with a fluorene ring and ethylenic polymerizable groups, a styrene-based resin, a polyurethane acrylate oligomer, and a combination of carbon black and titanium black, along with a photopolymerization initiator and solvent, which forms a cured film with improved resolution, light-shielding, adhesion, and reduced undercutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the concentration of black pigment in the light-shielding film is increased to improve light-shielding property, then light-shielding performance is improved, but mask pattern blurring and development residues occur
Solution Approach 1:
The patent changes the chemical composition parameters of the resin system by incorporating specific compounds (cardo resin with fluorene ring, styrene-based resin with controlled molecular weight, polyurethane acrylate oligomer) to achieve optimal light-shielding performance without pattern blurring. This resolves the contradiction by finding the right compositional balance rather than simply increasing pigment concentration.
Solution Approach 2:
The patent uses a composite resin system combining multiple different resin types (cardo resin, styrene-based resin, polyurethane acrylate oligomer) with black pigment and photopolymerization initiator. This composite approach allows the material to achieve both high light-shielding property and good pattern definition by leveraging the complementary properties of each component.
2Illumination intensity
If the concentration of black pigment in the light-shielding film is increased to improve light-shielding property, then light-shielding performance is improved, but reactivity during development process deteriorates
Solution Approach 1:
The patent modifies the resin composition parameters to include specific functional groups (fluorene ring with ethylenic polymerizable groups, polyurethane acrylate oligomer) that enhance reactivity during photopolymerization and development. This allows maintaining high black pigment concentration for light-shielding while preserving development reactivity through the reactive functional groups in the resin system.
3Illumination intensity
If the concentration of black pigment in the light-shielding film is increased to improve light-shielding property, then light-shielding performance is improved, but undercutting increases
Solution Approach 1:
The patent employs a composite resin system where cardo resin provides structural integrity, styrene-based resin controls flow and filling behavior, and polyurethane acrylate oligomer enhances adhesion. This composite formulation allows achieving high light-shielding property while maintaining vertical profile and minimizing undercutting through optimized rheological and adhesive 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 resin composition provides a cured film with enhanced resolution, light-shielding properties, and adhesion while minimizing undercutting, making it suitable for black matrices and color filters, thereby improving device performance.
Implementation Method 1
The resin composition includes a photopolymerization initiator (C)... The resin composition provides a cured film with enhanced resolution, light-shielding properties, and adhesion
Implementation Method 2
The resin composition includes a photoacid generator (D)... capable of providing good resolution, light-shielding property, adhesion and which are less prone to undercutting
Implementation Method 3
The resin composition includes a black colorant (E)... The cured film with enhanced resolution, light-shielding properties
Data Source
AI summary
A resin composition, a cured film and a color filter are provided. The resin composition includes a resin (A), a polymerizable monomer (B), a photopolymerization initiator (C), a photoacid generator (D), a black colorant (E) and a solvent (F). The resin (A) includes an alkali-soluble resin (A-1) and a styrene-based resin (A-2). A weight average molecular weight of the alkali-soluble resin (A-1) is 2,000 to 20,000. The alkali-soluble resin (A-1) includes a structural unit having a fluorene ring and two or more ethylenic polymerizable groups. The polymerizable monomer (B) includes a polyurethane acrylate oligomer (B-1).