Core-Shell Dye for Fine-Pattern Color Filters With Chemical Resistance

Solution Overview

Problem

Existing color filters face limitations in thinning, fine pattern formation, and color mixing due to pigment particle size, with dyes being less durable and inferior in chemical resistance and wavelength matching properties.

Innovation Solution

A core-shell dye is developed, comprising a core with epoxy and (meth)acrylate groups, surrounded by a shell with halogen groups, enhancing chemical resistance, patternability, and wavelength matching, allowing for fine pattern formation even with reduced dye content.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pigment is used for color filtering, then chemical resistance and durability are improved, but manufacturing precision and fine pattern formation are worsened due to particle size limitations

Engineering Contradiction:

Improvechemical resistanceVSAvoidfine pattern formation

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The pigment particle is segmented into a core-shell structure where the core contains the coloring pigment and the shell contains photopolymerizable groups. This segmentation allows the pigment to maintain its particle form for chemical resistance while the shell enables fine pattern formation through photolithography processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite material by combining pigment particles with photopolymerizable resin to form core-shell structured particles. This composite structure integrates the chemical resistance of pigment with the patternability of photopolymerizable materials, resolving the contradiction between durability and manufacturing precision.

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If dye is used for color filtering, then manufacturing precision and fine pattern formation are improved, but reliability and chemical resistance are worsened

Engineering Contradiction:

Improvefine pattern formationVSAvoidchemical resistance

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The invention creates a composite material by combining pigment particles with photopolymerizable resin to form core-shell structured particles. This composite structure integrates the chemical resistance of pigment with the patternability of photopolymerizable materials, resolving the contradiction between durability and manufacturing precision.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The core-shell structure applies local quality by concentrating the pigment in the core for chemical resistance while placing photopolymerizable groups in the shell for pattern formation. This spatial differentiation of functions allows both contradictory requirements to be satisfied in different regions of the same particle.

Inventive Principle:

Principle #3Local quality

3Manufacturing precision

If pigment particle size is reduced for fine pattern formation, then manufacturing precision is improved, but chemical resistance and durability are worsened

Engineering Contradiction:

Improvefine pattern formationVSAvoiddurability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The pigment particle is segmented into a core-shell structure where the core contains the coloring pigment and the shell contains photopolymerizable groups. This segmentation allows the pigment to maintain its particle form for chemical resistance while the shell enables fine pattern formation through photolithography processes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The photopolymerizable shell acts as a flexible protective layer that can be precisely patterned while maintaining the integrity and chemical resistance of the inner pigment core. The shell structure allows for thin film formation that doesn't compromise the underlying pigment particle's durability.

Inventive Principle:

Principle #30Flexible shells and thin films

4Reliability

If dye content is reduced for improved chemical resistance, then reliability is improved, but manufacturing precision and patternability are worsened

Engineering Contradiction:

Improvechemical resistanceVSAvoidpatternability

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The core-shell structure applies local quality by concentrating the pigment in the core for chemical resistance while placing photopolymerizable groups in the shell for pattern formation. This spatial differentiation of functions allows both contradictory requirements to be satisfied in different regions of the same particle.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention creates a composite material by combining pigment particles with photopolymerizable resin to form core-shell structured particles. This composite structure integrates the chemical resistance of pigment with the patternability of photopolymerizable materials, resolving the contradiction between durability and manufacturing precision.

Inventive Principle:

Principle #40Composite materials

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 improves chemical resistance, patternability, and wavelength matching, enabling the formation of fine patterns with enhanced durability and spectral characteristics suitable for CMOS image sensors.

Implementation Method 1

a shell represented by Chemical Formula 2, the shell surrounding the core

Methodology Applied

Scientific EffectChemical resistance enhancement through halogen substitution:

Implementation Method 2

at least one of R1 and R2 includes a substituted or unsubstituted epoxy group at a terminal end

Methodology Applied

Scientific EffectEpoxy group reactivity:

Implementation Method 3

at least one of R3 and R4 includes a substituted or unsubstituted (meth)acrylate group at a terminal end

Methodology Applied

Scientific Effect(Meth)acrylate group polymerization: Photopolymerisation

Implementation Method 4

wavelength matching into the green band

Methodology Applied

Scientific EffectLight absorption for color filtering: Absorption (EM radiation)

Data Source

PatentUS12504684B2Core-shell dye, photosensitive resin composition including the same, and color filter

Publication Date: 2025.12.23 SAMSUNG SDI CO LTD

AI summary

A core-shell dye, a photosensitive resin composition including the same, and a color filter manufactured using the photosensitive resin composition, the core-shell dye including a core represented by Chemical Formula 1; and a shell represented by Chemical Formula 2, the shell surrounding the core,