Polymerizable Composition for Solid-State Imaging Light-Blocking Filters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polymerizable compositions used for light-blocking color filters in solid-state imaging devices face challenges in achieving high sensitivity during curing and minimizing residue generation, especially when blocking light across the ultraviolet to infrared wavelength range, and require improved light-blocking properties in the IR region.
Innovation Solution
A polymerizable composition comprising a polymerizable compound, a binder polymer, a photopolymerization initiator, and a titanium black dispersion, with a mass ratio of the polymerizable compound to the binder polymer exceeding 1, ensuring high sensitivity and reduced residue formation, particularly effective in forming light-blocking filters for solid-state imaging devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If carbon black is used to block infrared light (800-1300 nm), then light-blocking property in IR region is improved, but transmittance at 300-500 nm is remarkably reduced making curing difficult
Solution Approach 1:
The patent changes the key parameter from carbon black to titanium black pigment, which has different optical properties. Titanium black provides strong infrared absorption while maintaining high transmittance in the 300-500 nm range, enabling both IR blocking and effective UV curing.
Solution Approach 2:
The patent uses a polymerizable composition with a specific mass ratio (polymerizable compound to binder polymer > 1) that enables high sensitivity curing. This formulation allows the use of minimal pigment concentration while achieving sufficient IR blocking, reducing residue generation.
2Object-affected harmful factors
If titanium black is used to block infrared light, then light-blocking property in IR region is improved compared to carbon black, but light transmittance at 300-500 nm is insufficient leading to insufficient curing
Solution Approach 1:
The patent optimizes the mass ratio of polymerizable compound to binder polymer to be greater than 1, increasing the concentration of polymerizable compounds that absorb UV light effectively. This parameter change enhances curing sensitivity while maintaining the benefits of titanium black for IR blocking.
Solution Approach 2:
The patent creates a composite polymerizable composition combining titanium black pigment with a specific formulation of polymerizable compounds and binder polymers. This composite material achieves synergistic effects: titanium black provides IR blocking while the high-concentration polymerizable compounds ensure adequate UV absorption for curing.
3Object-affected harmful factors
If the content of black color material is increased to enhance light-blocking property, then light-blocking capability is improved, but residues in the periphery of light-blocking color filter are easily generated
Solution Approach 1:
The patent changes the pigment type from carbon black or conventional titanium black to a specific titanium black pigment with optimized particle characteristics and dispersion properties. This allows achieving sufficient light-blocking capability at lower pigment concentrations, reducing residue formation at the periphery of the color filter.
Solution Approach 2:
The patent ensures uniform dispersion of titanium black pigment throughout the polymerizable composition, creating local homogeneity that prevents pigment aggregation at the periphery. This uniform distribution maintains light-blocking performance while minimizing edge residues.
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 enables high sensitivity during curing and minimizes residue generation, effectively blocking light across the ultraviolet to infrared range, enhancing the performance of light-blocking color filters in solid-state imaging devices.
Implementation Method 1
a polymerizable composition comprising (A) a polymerizable compound, (B) a binder polymer, (C) a photopolymerization initiator
Implementation Method 2
a polymerizable composition comprising (D) a titanium black dispersion... effectively blocking light across the ultraviolet to infrared range
Data Source
AI summary
A polymerizable composition including at least a polymerizable compound, a binder polymer, a photopolymerization initiator, and a titanium black dispersion, wherein the mass ratio of the content of the polymerizable compound to the content of the binder polymer is more than 1.