Photosensitive Composition for Color Filter Adhesion
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Solution Overview
Problem
The challenge is to develop a photosensitive composition that balances adhesiveness and pattern forming properties, particularly when using halogenated zinc phthalocyanine, which tends to have low transmittance to i-rays and insufficient adhesiveness to substrates, and increasing photopolymerization initiator content can lead to undesirably wide patterns.
Innovation Solution
A photosensitive composition comprising a photopolymerization initiator with a molar light absorption coefficient of 12,000 L·mol−1·cm−1 or more at 365 nm, a polymerizable monomer with three ethylenically unsaturated double bonds, and a halogenated zinc phthalocyanine, with a mass ratio of photopolymerization initiator to polymerizable monomer of 0.15 or less, and optionally including an oxime compound with a naphthalene ring, to enhance sensitivity and maintain pattern quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of halogenated zinc phthalocyanine is increased to improve color gamut and color reproducibility, then the transmittance to i-rays decreases, but the adhesiveness to substrate becomes insufficient
Solution Approach 1:
The patent changes the chemical structure parameters of the photopolymerization initiator to achieve high light absorption efficiency. By selecting initiators with specific molecular structures (compounds of formula I where Ar1-Ar6 are aromatic rings with electron-withdrawing groups), the system achieves effective i-ray absorption and polymerization initiation while maintaining substrate adhesiveness, resolving the contradiction between color performance and bonding strength.
Solution Approach 2:
The patent creates a composite photosensitive composition combining halogenated zinc phthalocyanine (for color performance), polymerizable monomers (for film formation), and specifically designed photopolymerization initiators (for curing). This composite approach allows each component to contribute its strengths: the phthalocyanine provides color gamut, while the composite system maintains adhesiveness through controlled polymerization.
2Volume of moving object
If the thickness of the cured film is increased to improve coverage, then the transmittance to i-rays decreases, but the adhesiveness to substrate becomes insufficient
Solution Approach 1:
The patent optimizes the photopolymerization initiator parameters to achieve high absorption coefficient and efficient polymerization at lower concentrations. This allows sufficient curing penetration through thicker films while maintaining substrate adhesiveness, as the initiator effectively activates polymerization throughout the film depth without requiring excessive thickness that would block i-rays.
3Strength
If the content of photopolymerization initiator is increased to improve adhesiveness, then the polymerization efficiency improves, but the pattern line width becomes wider than desired
Solution Approach 1:
The patent changes the photopolymerization initiator to compounds with high molar absorption coefficients at i-ray wavelengths. This allows the system to achieve effective polymerization and adhesiveness at lower initiator concentrations, preventing excessive polymerization that would cause line width expansion while still ensuring sufficient curing for strong substrate bonding.
Solution Approach 2:
The patent uses photopolymerization initiators with exceptionally high light absorption efficiency, allowing only the necessary amount of polymerization to occur in the exposed regions. This partial action approach ensures complete curing where needed without excessive polymerization spreading into unexposed areas, thereby maintaining precise pattern line widths while achieving adequate adhesiveness.
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 achieves excellent adhesiveness and pattern forming properties, with improved optical density and reduced pattern width, allowing for high-quality film formation on substrates while maintaining sensitivity to i-rays.
Implementation Method 1
a photopolymerization initiator I including a photopolymerization initiator I1 having a molar light absorption coefficient at a wavelength of 365 nm of 12,000 L·mol−1·cm−1 or more
Implementation Method 2
a halogenated zinc phthalocyanine, in which the polymerizable monomer M contains a polymerizable monomer M1 having three groups having an ethylenically unsaturated double bond
Data Source
AI summary
Provided are a photosensitive composition capable of forming a cured film having excellent adhesiveness and pattern forming properties, a color filter, a pattern forming method, a solid-state imaging device, and an image display device. The photosensitive composition includes a photopolymerization initiator I, a polymerizable monomer M having two or more groups having an ethylenically unsaturated double bond, and a halogenated zinc phthalocyanine, in which the polymerizable monomer M contains a polymerizable monomer M1 having three groups having an ethylenically unsaturated double bond, the photopolymerization initiator I contains a photopolymerization initiator I1 having a molar light absorption coefficient at a wavelength of 365 nm of 12,000 L·mol−1·cm−1 or more, and the ratio of the mass of the photopolymerization initiator I to the mass of the polymerizable monomer M is 0.15 or less in terms of the mass of the photopolymerization initiator I/the mass of the polymerizable monomer M.