Light Absorption Filter Layers for Adhesion and UV Decolorization

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Solution Overview

Problem

There is a need for a light absorption filter with improved adhesiveness and decolorization properties, particularly in image display devices such as OLED, inorganic EL, and liquid crystal displays, to enhance interlayer bonding and reduce secondary absorption upon ultraviolet irradiation.

Innovation Solution

A light absorption filter comprising a wavelength selective absorption layer with a resin containing an acid group and a dye, paired with an adjacent layer having a basic group, which forms a hydrogen bond and generates a radical upon ultraviolet irradiation, allowing for enhanced adhesiveness and decolorization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a wavelength selective absorption layer containing a dye and resin is used in an image display device, then light absorption and color reproduction are improved, but adhesiveness between the absorption layer and adjacent layers deteriorates

Engineering Contradiction:

Improvelight absorption performanceVSAvoidadhesiveness

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent introduces a specific resin component as an intermediary substance between the wavelength selective absorption layer and adjacent layers. This resin contains functional groups that form hydrogen bonds with both the dye-containing absorption layer and the adjacent layer, acting as a mediator that improves interlayer adhesiveness without compromising the light absorption performance of the dye.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a composite resin system in the wavelength selective absorption layer that combines multiple components: a dye for light absorption, a first resin for structural integrity, and a second resin specifically selected to provide adhesiveness through hydrogen bonding. This composite material approach allows simultaneous optimization of light absorption, adhesion, and structural properties.

Inventive Principle:

Principle #40Composite materials

2Productivity

If ultraviolet irradiation is applied to decolorize the dye in the absorption layer, then decolorization efficiency is improved, but secondary absorption and material degradation worsen

Engineering Contradiction:

Improvedecolorization efficiencyVSAvoidsecondary absorption

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the chemical environment parameters of the dye by selecting a resin with specific functional groups that form hydrogen bonds with the dye molecules. This changes the electronic state and absorption characteristics of the dye, reducing secondary absorption upon decolorization. The hydrogen bonding interaction alters the energy levels and transition probabilities, thereby minimizing harmful secondary absorption effects during ultraviolet irradiation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If a thick gas barrier layer is used to protect the dye from oxygen, then dye stability is improved, but light transmission and display quality worsen

Engineering Contradiction:

Improvedye stabilityVSAvoidlight transmission

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality protection by creating a microenvironment around the dye molecules through hydrogen bonding with the resin. This localized protective environment stabilizes the dye against oxygen degradation without requiring a thick gas barrier layer that would block light. The hydrogen bonding network provides local stabilization exactly where needed (at the dye-resin interface) while maintaining overall optical transparency.

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 filter exhibits excellent adhesiveness and decolorization properties, enabling effective light absorption and reduced secondary absorption, even under mild temperature conditions, thus improving the performance of image display devices.

Implementation Method 1

a wavelength selective absorption layer containing a resin A having an acid group, and a dye; and an adjacent layer directly disposed on at least one surface of the wavelength selective absorption layer, wherein the adjacent layer contains a resin having a basic group

Methodology Applied

Scientific EffectHydrogen bond: Chemical Bonding

Implementation Method 2

Methodology Applied

Scientific EffectPhotogeneration of radical: Photodissociation

Data Source

PatentUS20260036730A1Light absorption filter, optical filter, manufacturing method for optical filter, organic electroluminescent display device, inorganic electroluminescent display device, and liquid crystal display device

Publication Date: 2026.02.05 FUJIFILM CORP

AI summary

There are provided a light absorption filter including a wavelength selective absorption layer containing a resin A having an acid group, and a dye, and an adjacent layer directly disposed on at least one surface of the wavelength selective absorption layer, in which the adjacent layer contains a resin having a basic group, an optical filter using the light absorption filter, a manufacturing method for the optical filter, and an OLED display device, an inorganic EL display device, and a liquid crystal display device, each of which includes the optical filter.