Core-Shell Dye Structure for Bright, Durable Color Filters
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Solution Overview
Problem
Conventional pigment-based photosensitive resin compositions for color filters in liquid crystal displays and image sensors face limitations in luminance and contrast ratio due to pigment particle size, and dyes used for improved performance suffer from durability issues such as light and heat resistance.
Innovation Solution
A core-shell dye structure is introduced, comprising a compound with specific chemical formulas for the core and a surrounding shell, enhancing durability and improving luminance and contrast ratio by forming a coating layer that maintains solubility and compatibility with other resin components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pigment is used in photosensitive resin composition, then durability (light resistance and heat resistance) is improved, but luminance and contrast ratio are deteriorated due to pigment particle size
Solution Approach 1:
The pigment particle is segmented into a core-shell structure where the core contains the pigment granule and the shell contains the dye molecule. This segmentation allows the pigment's durability to be preserved in the core while the shell provides the desired optical properties for high luminance and contrast ratio.
Solution Approach 2:
The invention creates a composite material system consisting of a pigment granule core surrounded by a dye-containing shell. This composite structure combines the advantages of both pigment (durability) and dye (optical performance) into a single functional unit that resolves the contradiction between durability and luminance.
2Illumination intensity
If dye is used instead of pigment to improve luminance and contrast ratio, then luminance and contrast ratio are improved, but durability (light resistance and heat resistance) is deteriorated
Solution Approach 1:
The dye molecule is placed in the shell surrounding the pigment granule core. This segmentation allows the dye to provide high luminance and contrast ratio while the pigment core provides the durability protection, resolving the contradiction between optical performance and durability.
Solution Approach 2:
The composite structure of pigment core with dye shell creates a material that exhibits both the durability of pigment and the optical superiority of dye, simultaneously achieving high luminance, high contrast ratio, and excellent light and heat resistance.
3Ease of manufacture
If pigment dispersion method is used to form color filter, then color filter can be manufactured, but pattern residues increase and resolution decreases for fine patterns (2 μm or less)
Solution Approach 1:
The invention changes the physical-chemical parameters of the coloring material by using a core-shell structure with dye in the shell. This allows the material to maintain solubility and compatibility with resin components, enabling better pattern formation and reduced residues in fine patterns while maintaining manufacturability.
Solution Approach 2:
The shell acts as an intermediary between the pigment core and the resin matrix, providing solubility and compatibility that facilitates uniform distribution and precise patterning, thereby reducing pattern residues and improving resolution in fine patterns.
Data Source
AI summary
A core-shell dye including a core having a compound represented by Chemical Formula 1 and a shell surrounding the core and represented by Chemical Formula 2 or Chemical Formula 3, a photosensitive resin composition including the same, and a color filter manufactured using the photosensitive resin composition.(In Chemical Formulae 1 to 3, each substituent is the same as defined in the specification.)