Quantum Dot Photosensitive Resin Composition for Color Filter Undercut Control

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Solution Overview

Problem

Photosensitive resin compositions used in color filters for display devices face challenges with insufficient photocuring, leading to inadequate chemical and heat resistance, particularly due to competition between colorants and photopolymerization initiators for light energy, resulting in low initiation efficiency and undercut profiles during patterning.

Innovation Solution

A quantum dot-containing photosensitive resin composition is developed, incorporating a binder resin with specific structural units and weight average molecular weights, along with a photopolymerizable monomer and photopolymerization initiator, to enhance curing and reduce undercut profiles while maintaining optical characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If colorants (pigment/dye) are added to the photosensitive resin composition to achieve color filtering function, then the color filter can perform its intended function, but the photopolymerization initiator's ability to absorb light energy is reduced due to competition with colorants, resulting in insufficient curing and low initiation efficiency

Engineering Contradiction:

Improvecolor filtering functionVSAvoidcuring efficiency

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the molecular weight parameter of the binder resin to a specific range (10,000-100,000 g/mol) to optimize the balance between colorant dispersion and photopolymerization efficiency. This parameter adjustment allows sufficient light penetration for initiator activation while maintaining color filter functionality

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite photosensitive resin composition containing binder resin, colorants, photopolymerization initiator, and photopolymerizable monomer in specific proportions. This composite formulation ensures that colorants provide filtering function while the binder resin matrix allows adequate light transmission for curing

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional binder resins are used in the photosensitive resin composition, then the composition can be manufactured easily, but the curing is insufficient in the lower parts of the layer, resulting in undercut profiles and poor pattern precision

Engineering Contradiction:

ImprovemanufacturabilityVSAvoidpattern precision

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent specifies a particular molecular weight range (10,000-100,000 g/mol) for the binder resin to ensure proper curing throughout the layer thickness. This parameter optimization prevents undercut profiles by ensuring uniform curing from top to bottom while maintaining ease of manufacturing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses an excess of photopolymerizable monomer (10-50 parts by weight per 100 parts binder resin) to ensure sufficient curing reaction occurs throughout the entire layer thickness, compensating for light attenuation and preventing undercut formation

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If additional thermal curing at temperatures greater than or equal to 200°C is applied to remedy insufficient photocuring, then the required chemical and heat resistance can be achieved, but the material becomes incompatible with devices requiring low temperature processes

Engineering Contradiction:

Improvechemical and heat resistanceVSAvoidcompatibility with low temperature processes

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent optimizes the photopolymerization initiator concentration (0.1-10 parts by weight per 100 parts binder resin) and selects initiators with appropriate absorption characteristics to maximize curing efficiency at lower temperatures, eliminating the need for high temperature thermal curing

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent ensures continuous and complete photopolymerization throughout the layer by optimizing the composition to achieve sufficient curing during the exposure process itself, providing continuous useful action without requiring additional high-temperature curing steps

Inventive Principle:

Principle #20Continuity of useful action

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 minimizes undercut profiles and improves the resolution and precision of patterns, maintaining desired optical characteristics and enhancing the reliability of the photosensitive resin composition.

Implementation Method 1

a photopolymerization initiator; (C) a photopolymerizable monomer

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

A quantum dot-containing photosensitive resin composition

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentUS10921709B2Photosensitive resin composition, photosensitive resin layer using the same, and color filter

Publication Date: 2021.02.16 SAMSUNG SDI CO LTD

AI summary

A photosensitive resin composition for producing a photosensitive resin film is provided, along with the manufactured photosensitive resin film and a color filter including the photosensitive resin layer. The photosensitive resin composition includes: (A) a quantum dot; (B) a binder resin having a weight average molecular weight of about 2,000 g/mol to about 12,000 g/mol; (C) a photopolymerizable monomer; (D) a photopolymerization initiator; and (E) a solvent.