Infrared Filter Composition Adhesiveness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing infrared transmitting filters face challenges in forming fine patterns with excellent adhesiveness due to low transmittance with respect to light used for exposure, which affects their sensitivity and pixel size reduction requirements.
Innovation Solution
A composition comprising a coloring material, a resin, and a polymerizable compound with a compound A having an alkyleneoxy group and three ethylenically unsaturated groups, along with a photopolymerization initiator, where the ratio of absorbance in specific wavelength ranges is optimized to enhance adhesiveness and spectral characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composition with high visible light absorption is used to achieve good spectral characteristics for infrared transmission, then the adhesiveness and sensitivity decrease due to low transmittance of exposure light
Solution Approach 1:
The patent changes the chemical structure parameters of the polymerizable compound by introducing an alkyleneoxy group, which modifies the absorbance characteristics of the composition. This allows optimization of the absorbance ratio A/B while maintaining adequate exposure light transmittance for proper curing and adhesiveness
Solution Approach 2:
The patent creates a composite composition containing specific components (coloring material, resin, polymerizable compound with alkyleneoxy group, and photopolymerization initiator) that work together to achieve both high visible light absorption for spectral characteristics and sufficient exposure light transmittance for manufacturing quality
2Manufacturing precision
If the pixel size is reduced to improve resolution, then the adhesiveness becomes insufficient due to low transmittance of exposure light in conventional compositions
Solution Approach 1:
The patent modifies the optical parameters of the composition by incorporating a polymerizable compound with an alkyleneoxy group, which adjusts the absorbance characteristics to allow sufficient exposure light transmittance even in reduced-thickness films corresponding to smaller pixel sizes, while maintaining proper curing and adhesiveness
3Productivity
If a polymerizable compound with four or more functional groups is used to improve sensitivity and curing, then the formation of fine patterns with excellent adhesiveness becomes difficult
Solution Approach 1:
The patent changes the functional group count parameter of the polymerizable compound from four or more to three ethylenically unsaturated groups, combined with introducing an alkyleneoxy group. This parameter modification achieves the right balance between sensitivity for fine pattern formation and adhesiveness for the cured film
Solution Approach 2:
The patent introduces the alkyleneoxy group which provides local chemical characteristics that enhance adhesiveness specifically, while the three functional groups provide sufficient reactivity for fine pattern formation. Each component contributes a specific local quality that addresses different requirements
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 allows for the formation of fine patterns with excellent adhesiveness and spectral characteristics, enabling improved infrared light transmission while reducing pixel size and minimizing noise from visible light.
Implementation Method 1
a photopolymerization initiator
Data Source
AI summary
Provided is a composition with which a pattern having excellent adhesiveness can be formed. In addition, provided are a film, an infrared transmitting filter, a solid image pickup element, an image display device, and an infrared sensor. This composition includes a coloring material, a resin, a polymerizable compound, and a photopolymerization initiator. The polymerizable compound includes a compound A having an alkyleneoxy group and three ethylenically unsaturated groups, and a ratio A/B of a minimum value A of an absorbance of the composition in a wavelength range of 400 to 750 nm to a maximum value B of an absorbance of the composition in a wavelength range of 1100 to 1300 nm is 4.5 or higher.