Polymerizable Composition for Color Filter Illuminance Independence

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Solution Overview

Problem

Existing polymerizable compositions for color filters face challenges in achieving uniform curing and pattern resolution due to illuminance dependency and surface sensitivity issues, particularly when using high-intensity exposure apparatuses, leading to irregular pattern formation and reduced image quality.

Innovation Solution

A polymerizable composition comprising a polymerizable compound, a polymerization initiator, a coloring agent, and a specific polymer with groups having polymerization inhibiting and surface localizability properties, which suppresses unwanted polymerization at the surface and enhances development uniformity, thereby improving pattern resolution and illuminance independence.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a black pigment such as carbon black is used to maintain light-shielding properties, then light-shielding properties are improved, but transmittance of exposure light is low and only the surface is cured

Engineering Contradiction:

Improvelight-shielding propertiesVSAvoidcuring uniformity

Core Design Contradiction:

Object-affected harmful factorsVSManufacturing precision

Solution Approach 1:

The patent changes the chemical composition parameters of the polymerizable composition by incorporating specific compounds (polymerizable compounds with particular functional groups, specific photopolymerization initiators, and controlled pigment concentrations) to optimize both light-shielding properties and exposure light transmittance, enabling uniform curing throughout the layer thickness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite formulation combining multiple polymerizable compounds (including cyclic carbonate compounds and carboxylic acid compounds), photopolymerization initiators, and light-shielding pigments in specific ratios to achieve both sufficient light-shielding properties and adequate exposure light transmission for uniform curing

Inventive Principle:

Principle #40Composite materials

2Productivity

If exposure is carried out using high illuminance, then sensitivity is increased, but amplification of polymerization becomes great and image becomes wide

Engineering Contradiction:

Improveexposure sensitivityVSAvoidpattern resolution

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent optimizes the chemical composition parameters including the types and concentrations of polymerizable compounds and photopolymerization initiators to control the polymerization reaction kinetics, enabling high sensitivity exposure while suppressing excessive polymerization amplification that causes image widening

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces specific polymerizable compounds and photopolymerization initiators that act as intermediaries to mediate the exposure process, allowing controlled polymerization that maintains pattern fidelity even under high illuminance conditions

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If a polymerizable composition colored to be black or blue is used, then sensitivity at the surface is extremely high, but curability in the vicinity of substrate becomes insufficient

Engineering Contradiction:

Improvesurface sensitivityVSAvoidcurability uniformity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent adjusts the chemical composition parameters by selecting specific polymerizable compounds with appropriate molecular weights and functional groups, and controlling the concentration of photopolymerization initiators, to balance the polymerization reaction between surface and substrate regions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates local quality differences in the polymerizable composition by incorporating compounds that provide different reactivity profiles, enabling the surface to have high sensitivity while ensuring adequate curability reaches the substrate region

Inventive Principle:

Principle #3Local quality

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 composition ensures excellent curability and pattern resolution, even with thin or fine patterns, and provides a color filter with good color separation properties for high-resolution solid-state imaging devices, reducing the impact of varying exposure illuminance.

Implementation Method 1

a polymerizable composition comprising (A) a polymerizable compound, (B) a polymerization initiator

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

coloring agents of red, green, blue, cyan, magenta, yellow, or the like are used in combination, or a black dye or pigment is used to realize the light-shielding properties

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS8663880B2Polymerizable composition for color filter, color filter, and solid-state imaging device

Publication Date: 2014.03.04 FUJIFILM CORP

AI summary

A polymerizable composition for a color filter, including (A) a polymerizable compound, (B) a polymerization initiator, (C) a coloring agent, and (D) a polymer including at least a group having polymerization inhibiting ability and a group having surface localizability.