Color Filter Ink Hydroxy Acrylate Adhesion

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Solution Overview

Problem

Conventional methods for fabricating color filters, such as the pigment dispersion method, are cumbersome and wasteful, and inkjet printing methods face issues with ink uniformity and adhesion due to high repulsive forces between the color ink and the black matrix patterns, leading to uneven surfaces and defects like light leakage and residual images.

Innovation Solution

A color filter ink comprising a polymer binder with hydroxy groups, a crosslinking monomer, a solvent, and a pigment dispersion, which improves wettability and adhesion on the black matrix and glass substrate, ensuring uniform coating and preventing curvature formation, thereby enhancing the reliability and uniformity of the color filter.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pigment dispersion method is used, then color filter can be fabricated, but the process is cumbersome and uses long processing time

Engineering Contradiction:

Improvecolor filter fabricationVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent extracts the color formation process from the conventional multi-step photolithography method by using inkjet printing to directly deposit color inks onto the substrate, eliminating the need for repeated coating and development steps

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces the mechanical photolithography process with an inkjet printing system that uses digital control to deposit colors, substituting complex mechanical operations with a more efficient deposition-based approach

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If pigment dispersion method is used, then color filter can be formed, but considerable amounts of raw materials are wasted

Engineering Contradiction:

Improvecolor filter formationVSAvoidraw material waste

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The patent applies local quality by depositing color inks only in the specific pixel regions where they are needed, rather than coating the entire substrate and then removing excess material, thus eliminating material waste

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial action by applying ink only to the necessary areas (pixel openings) rather than the entire surface, preventing excess material application and subsequent waste

Inventive Principle:

Principle #16Partial or excessive action

3Ease of manufacture

If inkjet printing method is used with conventional color ink, then fabrication process is simpler, but ink uniformity deteriorates due to high repulsive force against black matrix patterns

Engineering Contradiction:

Improvefabrication process simplicityVSAvoidink uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent changes the chemical parameters of the ink by incorporating surface-active agents and adhesion promoters, which modify the ink's surface properties to reduce repulsion and improve wetting on the black matrix patterns

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces surface-active agents as intermediaries between the ink and the black matrix pattern, facilitating better adhesion and uniform spreading by mediating the interaction between the two surfaces

Inventive Principle:

Principle #24Intermediary (Mediator)

4Ease of operation

If conventional color ink is used, then coating can be performed, but curvature is formed on the ink surface causing light leakage and residual images

Engineering Contradiction:

Improvecoating operationVSAvoidcolor filter quality

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent uses adhesion promoters as intermediaries that form a bonding layer between the ink and the substrate, preventing curvature formation by ensuring uniform adhesion across the entire ink surface

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the surface energy parameters of the ink through additive components, which control the wetting behavior and prevent excessive surface tension that leads to curvature formation

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 inkjet printing method using the described ink achieves improved contact characteristics and uniform spreading, reducing curvature and color mixing, resulting in a more reliable and uniform color filter with enhanced flatness and color purity.

Implementation Method 1

improves wettability and adhesion on the black matrix and glass substrate

Methodology Applied

Scientific EffectWetting: Wetting

Implementation Method 2

polymer binder with hydroxy groups

Methodology Applied

Scientific EffectHydrogen bonding:

Implementation Method 3

crosslinking monomer

Methodology Applied

Scientific EffectCrosslinking:

Data Source

PatentUS7985782B2Ink for color filter, method of fabricating color filter using the ink, and color filter fabricated by the method

Publication Date: 2011.07.26 SAMSUNG DISPLAY CO LTD

AI summary

The present invention provides an ink for a color filter comprising a polymer binder, a crosslinking monomer, a solvent, a pigment, and a polymerization initiator. The polymer binder comprises acrylate or methacrylate including a hydroxy group. The polymer binder may comprise 2-hydroxyethyl acrylate or 2-hydroxyethyl methacrylate.