Photosensitive Green Composition for Solid-State Imaging Color Filters
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Solution Overview
Problem
Solid-state imaging elements face issues with pattern shape defects and residue due to poor adhesion and peeling during the development process, especially with the reduction in pixel size and film thickness, leading to suboptimal color separation and imaging performance.
Innovation Solution
A photosensitive green composition for color filters comprising C.I. Pigment Green 36 and/or C.I. Pigment Green 58, combined with a binder resin, photopolymerization initiator, photopolymerizable monomer, ultraviolet absorber, and monofunctional thiol, which enhances adhesion and prevents pattern chipping by ensuring uniform curing and improved cross-linking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the film thickness is reduced to 1 um or less to maintain color separation characteristics, then color separation performance is improved, but pattern shape defects and adhesion problems occur
Solution Approach 1:
The patent changes the chemical composition parameters of the photosensitive composition by incorporating specific monofunctional thiols (such as 3-mercaptopropyl) and controlling the ratio of polyfunctional monomers to multifunctional crosslinking agents. This chemical parameter optimization enables the formation of patterns with 1 um or less thickness that maintain both color separation performance and adhesion reliability through improved crosslinking density and uniformity.
2Manufacturing precision
If the pixel size is miniaturized to 0.5 to 2.0 um to increase resolution, then imaging resolution is improved, but pattern shape control and residue prevention become difficult
Solution Approach 1:
The patent introduces monofunctional thiol compounds as intermediary agents that facilitate controlled crosslinking in miniaturized pixel patterns. These thiols act as chain transfer agents that regulate polymerization kinetics, enabling precise pattern formation at 0.5 to 2.0 um scale while preventing residue and maintaining shape control during the development process.
Solution Approach 2:
The patent optimizes the molecular weight and functional group concentration of photopolymerizable monomers to achieve appropriate viscosity and curing characteristics for fine pixel patterns. By adjusting these parameters, the composition enables faithful pattern reproduction at sub-micron dimensions without deformation or residue formation.
3Device complexity
If conventional photosensitive compositions are used to form thin patterns, then formulation simplicity is maintained, but peel-off development and pattern chipping occur
Solution Approach 1:
The patent develops a composite photosensitive composition that integrates colorants, binder resins, photopolymerization initiators, and specifically selected monofunctional thiols in optimized ratios. This composite formulation creates synergistic effects where the thiol-modified crosslinking network prevents peel-off development and pattern chipping while maintaining coating uniformity, thereby ensuring pattern integrity without excessive formulation complexity.
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 verticality of pixel patterns, improved adhesion, and reduced residue, enabling high-resolution, fine pixel formation without pattern defects, even at film thicknesses of 1 um or less.
Implementation Method 1
a photopolymerization initiator (C), a photopolymerizable monomer (D)
Implementation Method 2
an ultraviolet absorber (E)
Data Source
AI summary
Provided are a photosensitive green composition for a color filter of a solid-state imaging element that can form a pixel having a cross-sectional shape excellent in verticality, an excellent adhesion property and little residue without pattern chipping due to peel-off development, and a color filter for a solid-state imaging element and a solid-state imaging element using the same. The above problem is solved by a photosensitive green composition for a color filter of a solid-state imaging element, containing a colorant (A), a binder resin (B), a photopolymerization initiator (C), a photopolymerizable monomer (D), an ultraviolet absorber (E), and a monofunctional thiol (F), wherein the colorant (A) contains C.I. Pigment Green 36 and/or C.I. Pigment Green 58.