Color Filter Pigment Composition Light Fastness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Color filters used in solid-state imaging devices face challenges in maintaining light fastness, particularly when a protective layer is formed on their surface, as it can lead to deterioration in light resistance.
Innovation Solution
A coloring composition is developed that includes a coated yellow pigment with a resin, a halogenated phthalocyanine pigment, and a dispersant with an acid value of 40 mgKOH/g or more, along with a curable compound, to produce a film with enhanced light fastness by controlling the interaction between the pigments and suppressing discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is formed on the surface of a color filter, then the color filter is protected, but light fastness deteriorates
Solution Approach 1:
The patent introduces a specific dispersant as an intermediary substance between the halogenated phthalocyanine pigment and the protective layer. This dispersant with high acid value (40 mgKOH/g or more) acts as a mediator that prevents harmful interactions between the pigment and protective layer, thereby maintaining light fastness while allowing the protective layer to function. The dispersant forms a compatible interface that prevents discoloration.
Solution Approach 2:
The patent changes the chemical parameter of the dispersant by specifying a high acid value (40 mgKOH/g or more). This parameter change ensures the dispersant has sufficient acidity to interact effectively with the halogenated phthalocyanine pigment and form a stable complex that resists discoloration when the protective layer is applied, thus resolving the contradiction between protection and light fastness.
2Shape
If halogenated phthalocyanine pigment and yellow pigment are mixed, then green color is achieved, but discoloration occurs when protective layer is applied
Solution Approach 1:
The dispersant serves as an intermediary that mediates the interaction between the halogenated phthalocyanine pigment and yellow pigment. By selecting a dispersant with high acid value, the patent ensures that the dispersant can form stable complexes with both pigments, preventing their direct harmful interaction that would cause discoloration when the protective layer is applied, while still achieving the desired green color.
Solution Approach 2:
The patent creates a composite coloring composition that includes halogenated phthalocyanine pigment, yellow pigment, and a specific dispersant with high acid value. This composite material formulation ensures that the pigments work together to produce green color while the dispersant maintains their stability and prevents discoloration, even in the presence of a protective layer.
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 effectively enhances light fastness and prevents discoloration of the halogenated phthalocyanine pigment, even when a protective layer is applied, resulting in improved durability and resistance to light-induced degradation.
Implementation Method 1
a dispersant having an acid value of 40 mgKOH/g or more... suppressing discoloration
Implementation Method 2
a curable compound... when a protective layer is formed on their surface
Data Source
AI summary
Provided are a coloring composition capable of producing a film having excellent light fastness, and the like, a method for producing a coloring composition, a color filter, a pattern forming method, a solid-state imaging device, and an image display device. The coloring composition includes a coated pigment in which at least a portion of a surface of a yellow pigment is coated with a resin, a halogenated phthalocyanine pigment, a dispersant having an acid value of 40 mgKOH/g or more, and a curable compound.