Dye-Enhanced Photosensitive Resin for Low-Reflectivity Light Shielding

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Solution Overview

Problem

Existing display devices face challenges in reducing reflectivity at a wavelength of 550 nm, which affects visibility, particularly in organic light-emitting displays, and existing light-shielding methods do not effectively address this issue.

Innovation Solution

A photosensitive resin composition comprising a binder resin with a specific repeating unit, a dye with a maximum absorption wavelength of 500-620 nm, and black pigments, which forms a light-shielding layer with high optical density and low reflectivity after curing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a polarizing film is used to block light, then light blocking is achieved, but bending properties are lost making flexible devices impossible

Engineering Contradiction:

Improvelight blockingVSAvoidbending properties

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent changes the material parameters from rigid polarizing film to flexible organic pigment dispersion, enabling both light blocking and bending properties. The composition uses specific binders and pigments that maintain optical performance while providing flexibility for wearable and foldable displays.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite light-shielding layer combining organic pigments, binders, and optional inorganic particles. This composite structure achieves light blocking equivalent to polarizing film while maintaining flexibility, solving the contradiction between optical performance and mechanical adaptability.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If carbon black and organic pigments are dispersed and applied to form a light-shielding layer, then the layer can be manufactured, but reflectivity at 550 nm wavelength is not sufficiently reduced

Engineering Contradiction:

ImprovemanufacturabilityVSAvoidreflectivity at 550 nm

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by using a combination of black pigments and specifically colored pigments (cyan, magenta, yellow) in controlled ratios. This localized color distribution optimizes absorption at the critical 550 nm wavelength while maintaining manufacturability through conventional dispensing processes.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent utilizes color changes by incorporating colored pigments that specifically absorb light at 550 nm (green region). The combination of black pigment with cyan, magenta, and yellow pigments creates enhanced absorption in the problematic wavelength range while maintaining ease of manufacture through standard pigment dispersion techniques.

Inventive Principle:

Principle #32Color changes

3Reliability

If a light-shielding layer is formed to prevent color interference, then image quality improves, but reflectivity reduction at 550 nm is insufficient affecting visibility

Engineering Contradiction:

Improveimage qualityVSAvoidreflectivity at 550 nm

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent enhances the light-shielding layer by adding colored pigments that specifically target 550 nm wavelength absorption. The colored pigment combination (cyan, magenta, yellow) works synergistically with black pigment to reduce reflectivity in the green region while maintaining the color interference prevention function, thereby improving both visibility and image quality.

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The patent creates an enhanced composite light-shielding layer that combines black pigment with colored pigments and specific binders. This composite structure maintains the original function of preventing color interference between red, green, and blue filters while adding the new function of reducing reflectivity at 550 nm, thus improving visibility without compromising image quality.

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 composition significantly reduces reflectivity at 550 nm, enhancing visibility by incorporating a dye that absorbs well within the resin, resulting in a high optical density and low reflectivity layer.

Implementation Method 1

a dye having a maximum absorption wavelength in a region of 500 nm to 620 nm

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

a photoinitiator; and a reactive unsaturated compound

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS12461445B2Low reflectivity photosensitive resin composition and light-shielding layer using same

Publication Date: 2025.11.04 DUK SAN NEOLUX

AI summary

According to one embodiment of the present disclosure, a photosensitive resin composition comprising a resin containing a repeating unit represented by Chemical Formula (1), a dye represented by Chemical Formula (2), a reactive unsaturated compound, a pigment, an initiator, and a solvent, and a display device comprising a pattern layer containing a polymerization reaction product of the photosensitive resin composition are provided.