Photosensitive Coloring Composition for Solid-State Imaging
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Solution Overview
Problem
Conventional photosensitive coloring compositions for solid-state imaging elements lack sufficient light-shielding ability against visible light and are inadequate for thinner film applications, particularly in the wavelength range of 650 to 700 nm, and fail to provide high-resolution near-infrared light detection with minimal residue.
Innovation Solution
A photosensitive coloring composition comprising a lactam-based pigment and a phthalocyanine or indanthrone-based pigment, with a polymer dispersing agent containing an amino group and polyether structure, achieving high light shielding in the visible light range and high transmittance for near-infrared light, and a production method involving a photopolymerization initiator and photopolymerizable components to form a film with specific spectral transmittance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional coloring compositions (azo type yellow pigment or isoindoline type yellow pigment and dioxazine type purple pigment) are used, then near-infrared light transmission is achieved, but visible light shielding ability is insufficient
Solution Approach 1:
The patent combines multiple pigment types (yellow pigment, purple pigment, and red pigment) into a composite coloring composition. This composite approach allows the material to simultaneously achieve near-infrared transmission (through the yellow and purple pigment combination) and improved visible light shielding (through the addition of red pigment that specifically blocks the 650-700nm wavelength range).
Solution Approach 2:
The patent modifies the spectral properties of the coloring composition by adjusting pigment ratios and types. Specifically, it changes the composition to include red pigment in addition to yellow and purple pigments, thereby altering the transmission and absorption characteristics across different wavelength ranges to achieve both near-infrared transmission and enhanced visible light blocking.
2Object-affected harmful factors
If coloring composition is applied to achieve high visible light shielding, then film thickness must be increased to 3.0 μm, but this compromises resolution and increases pixel film thickness
Solution Approach 1:
The patent changes the optical parameters of the coloring composition by introducing red pigment and optimizing the pigment ratio. This allows the composition to achieve high visible light shielding ability (blocking 400-700nm wavelengths) while maintaining sufficient performance at reduced film thicknesses, thereby enabling higher resolution imaging without excessive pixel film thickness.
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 provides enhanced light shielding in the visible light range and high transmittance for near-infrared light, enabling high-resolution near-infrared light detection with minimal residue and improved image quality in solid-state imaging elements.
Implementation Method 1
A photosensitive coloring composition including a coloring agent, a photopolymerization initiator, and a photopolymerizable component
Implementation Method 2
a film with a thickness of 1.0 μm produced by curing the photosensitive coloring composition has a maximum spectral transmittance of 10% or less in the wavelength range of 400 to 700 nm and a minimum spectral transmittance of 85% or more in the wavelength range of 850 to 1,200 nm
Data Source
AI summary
The invention provides a photosensitive coloring composition comprising a specific combination of a coloring agent, a photopolymerization initiator, and a photopolymerizable component that ensures excellent pattern processability and serves to produce a solid state imaging element with high image quality.