Black Curable Composition for Wafer Level Lens Light-Shielding
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Solution Overview
Problem
Conventional methods for forming light-shielding regions in wafer level lenses face challenges such as complexity, lens bending, and light scattering due to metal deposition, and existing carbon black-based compositions fail to provide sufficient light-shielding properties without compromising curing and transmittance.
Innovation Solution
A black curable composition incorporating a metal-containing inorganic pigment like titanium black, combined with a polymerization initiator and polymerizable compound, which forms a light-shielding film with excellent curing sensitivity and resistance to developers, while maintaining light-shielding properties across the visible and infrared spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carbon black-based composition is used for light-shielding, then light-shielding properties are improved, but curing sensitivity deteriorates and peeling occurs
Solution Approach 1:
The patent changes the chemical composition parameters by replacing carbon black with metal-containing inorganic pigments (titanium black, iron black, chromium oxide green) that have different optical and chemical properties. This parameter change achieves both excellent light-shielding properties and high curing sensitivity, while preventing peeling issues associated with carbon black-based compositions
Solution Approach 2:
The patent creates a composite curable composition by combining metal-containing inorganic pigments with specific polymerizable compounds (acrylates, methacrylates) and polymerization initiators. This composite material achieves synergistic effects where the metal pigment provides light-shielding while the polymerizable compound ensures proper curing and adhesion, eliminating the peeling problem
2Object-affected harmful factors
If metal deposition is used for light-shielding region formation, then light-shielding properties are improved, but device complexity increases and lens bending occurs
Solution Approach 1:
The patent replaces the mechanical/physical metal deposition process with a chemical solution-based approach. Instead of depositing metal layers through complex vacuum deposition equipment, the invention uses a liquid curable composition containing metal-containing inorganic pigments that can be applied by simple coating methods and then cured to form the light-shielding film, dramatically simplifying the manufacturing process
Solution Approach 2:
The patent introduces a polymerizable compound as an intermediary medium that binds the metal-containing inorganic pigment particles together and to the substrate. This intermediary allows the metal pigment to provide light-shielding properties while the polymerizable compound ensures proper adhesion and prevents lens bending, avoiding the problems of direct metal deposition
3Object-affected harmful factors
If carbon black-based composition is used, then light-shielding properties are improved, but light scattering occurs and transmittance deteriorates
Solution Approach 1:
The patent changes the particle characteristics parameter by using metal-containing inorganic pigments with controlled particle size, shape, and refractive index. These parameters are optimized to reduce light scattering while maintaining light-shielding properties, unlike carbon black particles which cause significant scattering and transmittance deterioration
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 forms a light-shielding film with high sensitivity during pattern formation, ensuring adequate light control and easy production, while preventing issues like peeling and light scattering, and improving curing efficiency compared to carbon black-based compositions.
Implementation Method 1
a black curable composition for a wafer level lens, which includes (A) a metal-containing inorganic pigment, (B) a polymerization initiator, and (C) a polymerizable compound
Data Source
AI summary
A black curable composition for a wafer level lens includes (A) a metal-containing inorganic pigment, (B) a polymerization initiator, and (C) a polymerizable compound. The (A) metal-containing inorganic pigment is preferably titanium black.