Azo Metal Complex Dyes for LCD Color Filters

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Solution Overview

Problem

Liquid crystal displays (LCDs) face challenges with poor color contrast, particularly in red colors, due to the limitations of existing pigments and dyes used in color filters, which lack thermal stability, compatibility with polymeric matrices, and flexibility to adjust to varying backlight characteristics.

Innovation Solution

Development of azo metal complex dyes with specific metal ions and trifluoroacetylamido groups that form stable complexes, offering high thermal and chemical stability, compatibility with polymeric matrices, and adjustable optical properties, allowing for improved homogeneity and contrast ratios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If pigment-based color filters are used to achieve high brilliance, then color brilliance is improved, but contrast ratio deteriorates due to light reflection and interference from pigment particles

Engineering Contradiction:

Improvecolor brillianceVSAvoidcontrast ratio

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent transitions from using pigment particles to soluble dye compounds, fundamentally changing the physical state parameter from solid particles to dissolved molecules. This eliminates light scattering and interference effects while maintaining color absorption properties, thereby improving contrast ratio without sacrificing color brilliance.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If existing red pigments are used in color filters, then color filter stability is improved, but adaptability to varying backlight characteristics deteriorates due to fixed absorption bands

Engineering Contradiction:

Improvecolor filter stabilityVSAvoidadjustment to backlight characteristics

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent employs soluble dye compounds whose absorption characteristics can be tuned by modifying molecular structure parameters such as substituents on the chromophoric body. This enables adjustment of absorption bands to match varying backlight spectra while maintaining thermal and chemical stability through appropriate molecular design.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention combines dye molecules with specific solubility-enhancing groups and stability-providing structural elements to create composite dye structures that simultaneously achieve adaptability, solubility, and stability - properties that cannot be obtained with conventional single-function pigments.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If conventional dyes from other application fields are used, then color property adjustment is improved, but thermal stability and compatibility with polymeric matrices deteriorate

Engineering Contradiction:

Improvecolor property adjustmentVSAvoidthermal stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies conventional dye structures by introducing specific substituent groups and molecular architectures that enhance thermal stability and polymeric matrix compatibility while preserving the ability to adjust color properties through systematic structural variation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates composite dye structures combining chromophoric cores for color adjustment with auxiliary groups providing thermal stability and matrix compatibility, achieving multiple performance requirements simultaneously that conventional dyes cannot meet.

Inventive Principle:

Principle #40Composite materials

4Quantity of substance

If pigment dispersions are used in color filters, then colorant availability is improved, but homogeneity deteriorates resulting in poor contrast ratios

Engineering Contradiction:

Improvepigment availabilityVSAvoidhomogeneity

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The patent changes the physical state parameter from solid pigment particles to soluble dye molecules, eliminating dispersion heterogeneity and achieving molecular-level homogeneity throughout the color filter matrix, which directly improves contrast ratio by eliminating light scattering.

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 azo metal complex dyes provide high thermal stability, chemical stability, and compatibility with polymeric matrices, resulting in enhanced color resolution, uniformity, and adjustable optical properties, significantly improving the contrast ratio and luminance of LCDs.

Implementation Method 1

The position of the absorption bands of these pigments and the resulting color filters can only be altered to a very small extent

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentEP2837663B1Metal complex azo dyes and their use as colorant for color resists

Publication Date: 2015.10.07 CHEIL INDUSTRIES INC

AI summary

The present invention relates to a trifluoroacetylamido diazo metal complex used as dye in color resists and a method for preparing the dye. The invention further relates to curable dye composition comprising the dye according to the invention as well as to a cured dye composition of the mentioned dye. Furthermore the invention relates to the use of the dye, the curable dye composition and/or the cured dye composition in color filters and to a display containing the dye.