Core-Shell Dye for High Luminance Color Filters
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photosensitive resin compositions for color filters in liquid crystal display devices face limitations in achieving high luminance and contrast ratio due to the size of pigment particles, and dyes used as alternatives suffer from inferior light and heat resistance.
Innovation Solution
A novel compound represented by Chemical Formula 1, which forms a core-shell dye with specific structural characteristics, is incorporated into a photosensitive resin composition, enhancing luminance and contrast ratio while improving durability through a core-shell structure and appropriate mole ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pigment particles are used in photosensitive resin composition, then durability (light resistance and heat resistance) is improved, but luminance and contrast ratio are limited due to particle size
Solution Approach 1:
The patent changes the physical state parameter of the colorant from particulate (pigment) to molecular (dye), while maintaining durability through specific chemical structure design and core-shell architecture. This parameter transformation allows the colorant to achieve both high luminance (as a dye) and improved durability (through the core-shell structure with photopolymerizable shell).
Solution Approach 2:
The patent creates a composite structure where a dye molecule is encapsulated within a photopolymerizable shell, forming a core-shell type colorant. This composite material combines the high luminance properties of dyes with the durability and light resistance of pigment-like protective structures, resolving the contradiction between luminance and durability.
2Illumination intensity
If dye is used instead of pigment, then luminance and contrast ratio are improved, but durability (light resistance and heat resistance) deteriorates
Solution Approach 1:
The patent applies beforehand cushioning by enclosing the dye molecule within a photopolymerizable shell before the colorant is exposed to light or heat. This protective shell acts as a cushion against environmental damage, preventing the dye from deteriorating under light and heat exposure, thus maintaining durability while preserving the high luminance properties of the dye.
Solution Approach 2:
The photopolymerizable shell serves as an intermediary between the dye molecule and the external environment (light, heat, oxygen). This intermediary layer protects the dye from direct exposure to harmful factors while allowing the dye to maintain its optical properties, thereby resolving the contradiction between luminance and durability.
3Reliability
If pigment particles are used, then durability is improved, but manufacturing precision (pattern characteristics and dispersion uniformity) deteriorates
Solution Approach 1:
The patent changes the size parameter of the colorant from micrometer-scale pigment particles to molecular-scale dye molecules (nanometer scale). This dramatic reduction in size enables much finer pattern formation and improved dispersion uniformity in the photosensitive resin composition, while the core-shell structure maintains durability.
Solution Approach 2:
The patent segments the colorant into a core-shell structure where the dye core is separated from the protective shell. This segmentation allows the dye to be dispersed at the molecular level for fine pattern precision, while the shell provides durability, thus resolving the contradiction between manufacturing precision and durability.
4Manufacturing precision
If smaller dispersion particle diameter is used for fine pattern, then manufacturing precision is improved, but luminance deteriorates due to insufficient pigment particle size
Solution Approach 1:
The patent changes the fundamental parameter of colorant morphology from particulate to molecular, enabling the colorant to achieve fine pattern precision at nanometer scale while maintaining high luminance through the dye's molecular absorption properties, unlike pigments where reducing particle size below a certain threshold diminishes optical performance.
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 core-shell dye composition achieves high luminance and contrast ratio with improved durability, maintaining color coordinate stability even after exposure to light and heat, outperforming conventional compositions.
Implementation Method 1
A liquid crystal display device includes a lower substrate on which a black matrix, a color filter, and an ITO pixel electrode are formed... Color filters are formed in a pixel region by sequentially stacking a plurality of color filters (in general, formed of three primary colors such as red (R), green (G), and blue (B) in a predetermined order to form each pixel...)
Implementation Method 2
A coloring photosensitive resin composition used for manufacturing a color filter according to the pigment dispersion method generally includes an alkali soluble resin, a photopolymerizable monomer, a photopolymerization initiator, an epoxy resin, a solvent, other additives, and the like... exposing a formed pattern to light, removing a non-exposed part with a solvent, and thermally curing the same
Data Source
AI summary
A compound represented by specific chemical formula, a core including the same, a core-shell dye including a shell surrounding the core, a photosensitive resin composition including the same, and a color filter manufactured using the photosensitive resin composition are disclosed.