Dye Compound for Color Filter Luminance and Contrast

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Solution Overview

Problem

Color filters manufactured using pigment-type photosensitive resin compositions face limitations in luminance and contrast ratio due to pigment particle size, and require smaller dispersion particle sizes for fine patterns, necessitating the development of a compound with improved spectral characteristics and solubility for enhanced imaging sensor performance.

Innovation Solution

A novel compound represented by Chemical Formula 1, which includes specific substituents and alkyl groups, is used in a photosensitive resin composition with an alkali soluble resin, photopolymerizable compound, and solvent, providing excellent green spectral characteristics and high luminance, even when used in smaller amounts, thereby improving the color filter's luminance and contrast ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a pigment-type photosensitive resin composition is used to manufacture a color filter, then the color filter can be manufactured with conventional methods, but the luminance and contrast ratio are limited due to pigment particle size

Engineering Contradiction:

ImproveluminanceVSAvoidpigment particle size

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent changes the fundamental parameter of colorant form from particulate (pigment) to molecular (dye), transitioning from a dispersed solid phase system to a dissolved molecular phase system. This parameter change eliminates the particle size limitation inherent in pigment-based systems, enabling superior luminance and contrast ratio while maintaining manufacturability through solution processing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical dispersion system (pigment particles physically dispersed in resin) with a chemical dissolution system (dye molecules dissolved in resin). This substitution eliminates the need for mechanical dispersion processes and the associated particle size constraints, achieving finer effective colorant distribution at the molecular level

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If pigment particles are used in the photosensitive resin composition, then the composition can provide color, but the particle size limits the formation of fine patterns required for imaging sensors

Engineering Contradiction:

Improvepattern finenessVSAvoiddispersion particle size

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The patent changes the size parameter of the colorant from micrometer-scale pigment particles to nanometer-scale dye molecules. This parameter change enables the formation of fine patterns required for imaging sensors, as the molecular-level dispersion eliminates the lower size limit imposed by pigment particle dimensions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical dispersion approach with molecular dissolution, substituting a system governed by particle mechanics with one governed by molecular thermodynamics. This enables pattern formation at the fine scale required for imaging sensors, as molecular diffusion and solution uniformity replace particle distribution mechanics

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Illumination intensity

If a dye is introduced instead of pigment to achieve improved color characteristics, then luminance and contrast ratio can be enhanced, but research on appropriate dye compounds is needed

Engineering Contradiction:

ImproveluminanceVSAvoidcompound selection complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent changes the chemical structure parameters of the dye molecule, specifically incorporating a Cu(I) phosphine complex core with tailored organic ligands containing electron-donating groups. This structural parameter change optimizes the dye's spectral properties, solubility, and photostability, achieving high luminance and contrast ratio while establishing a clear compound selection criterion based on molecular structure design

Inventive Principle:

Principle #35Parameter changes

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 compound achieves excellent color characteristics, including high luminance and contrast ratio, while reducing the amount needed, thus lowering production costs and enhancing the color reproducibility of the color filter.

Implementation Method 1

The green dye may have a maximum transmittance in a wavelength of about 445 nm to about 560 nm

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

a photopolymerizable compound, and a photopolymerization initiator

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS9581729B2Compound, photosensitive resin composition comprising the same and color filter

Publication Date: 2017.02.28 SAMSUNG SDI CO LTD

AI summary

A compound represented by Chemical Formula 1, wherein in Chemical Formula 1, each substituent is the same as defined in the detailed description, a photosensitive resin composition including the same, and a color filter manufactured using the photosensitive resin composition are provided.