Wavelength Selective Absorption Filter Gas Barrier Layer

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Solution Overview

Problem

Self-luminous display devices face challenges in reducing external light reflection and maintaining brightness while preventing changes in tint, especially when using wavelength selective absorption filters instead of circularly polarizing plates, and require improved light resistance and productivity in manufacturing.

Innovation Solution

A self-luminous display device incorporating a wavelength selective absorption filter with specific dyes and a crystalline resin gas barrier layer, where the filter satisfies a specific transmittance relation and has a gas barrier layer with controlled thickness and oxygen permeability, enhancing light resistance and productivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a wavelength selective absorption filter is used to suppress external light reflection, then the antireflection effect is improved, but the light resistance deteriorates due to dye degradation

Engineering Contradiction:

Improveexternal light reflectionVSAvoidlight resistance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

A gas barrier layer is introduced as an intermediary component between the wavelength selective absorption filter and the external environment. This layer acts as a protective mediator that blocks oxygen and moisture from reaching the dye, thereby preventing degradation while allowing the filter to maintain its antireflection function. The gas barrier layer has high oxygen permeability resistance and water vapor permeability resistance, effectively isolating the dye from harmful environmental factors.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the permeability parameters of the filter structure by incorporating a gas barrier layer with specific oxygen permeability (60-10000 times lower than the wavelength selective absorption filter) and water vapor permeability. This parameter change creates a protective environment that maintains dye stability while preserving the optical properties of the filter.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a gas barrier layer is added to improve light resistance, then the reliability is improved, but the device complexity increases

Engineering Contradiction:

Improvelight resistanceVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The gas barrier layer is implemented as a thin film structure that is integrated into the existing display device architecture. This thin film approach provides effective gas barrier protection without significantly increasing the overall device thickness or structural complexity. The layer is positioned between the wavelength selective absorption filter and the polarizing plate, creating a compact multi-layer structure that maintains device simplicity while enhancing reliability.

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If the oxygen permeability of the gas barrier layer is reduced to improve light resistance, then the dye protection is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvedye stabilityVSAvoidlayer thickness control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The invention uses composite material structure combining the wavelength selective absorption filter containing dye with a gas barrier layer having specific oxygen permeability characteristics. This composite structure achieves effective dye protection through the synergistic combination of the filter's optical properties and the barrier layer's protective properties, reducing the need for extremely precise thickness control while maintaining high reliability.

Inventive Principle:

Principle #40Composite materials

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 solution effectively suppresses external light reflection, maintains brightness, and minimizes tint changes, while providing excellent light resistance and improved manufacturing efficiency.

Implementation Method 1

a wavelength selective absorption filter containing a resin and dyes A, B, and C... the wavelength selective absorption filter effectively suppresses external light reflection

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

the wavelength selective absorption filter has a gas barrier layer directly disposed on at least one surface... the gas barrier layer provides excellent light resistance

Methodology Applied

Scientific EffectPermeation barrier: Permeation

Data Source

PatentUS20230125712A1Self-luminous display device

Publication Date: 2023.04.27 FUJIFILM CORP

AI summary

A self-luminous display device includes a wavelength selective absorption filter containing a resin and a dye including dye A, which has a main absorption wavelength band (WB) at a wavelength of 390 to 435 nm, a dye B, which has a main absorption WB at a wavelength of 500 to 520 nm, and a dye C, which has a main absorption WB at a wavelength of 580 to 620 nm, and a light emitting diode source, the wavelength selective absorption filter satisfies a definition according to Expression (I): Tmin (500 to 520)−Tmin (580 to 620)>0%; where Tmin indicates a minimum transmittance (%) at the cited wavelength, and a self-luminous display device in which the wavelength selective filter has a specific gas barrier layer directly disposed on at least one surface of the wavelength selective absorption filter.