Black Photosensitive Resin Composition for Light Blocking Layers
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Solution Overview
Problem
Existing black photosensitive resin compositions used in liquid crystal display devices face challenges in achieving excellent pattern linearity, resolution, and taper characteristics due to limitations in heat resistance, sensitivity, and the requirement for organic solvents, which affect the manufacturing of light blocking layers and color filters.
Innovation Solution
A black photosensitive resin composition is developed, comprising a binder resin, a colorant with silica nanoparticles, a photopolymerizable compound, and a photopolymerization initiator, where the silica nanoparticles are included in specific weight ratios to enhance taper characteristics and linearity, and the composition is optimized with additives like malonic acid and silane-based coupling agents to improve coating and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a photosensitive polyimide or phenol-based resin is used as a binder resin in the pigment dispersion method, then high heat resistance is obtained, but sensitivity is lowered and an organic solvent is required as a development solvent
Solution Approach 1:
The patent changes the chemical composition parameters by using a carboxyl-containing polymer as binder resin instead of conventional polyimide or phenol-based resins. This parameter change enables the formulation of a water-soluble photosensitive resin composition that maintains high heat resistance while improving sensitivity and eliminating the need for organic development solvents.
Solution Approach 2:
The patent creates a composite material system combining carboxyl-containing polymer with specific pigments and photopolymerizable compounds. This composite formulation achieves a balance between heat resistance and sensitivity, allowing water-based processing while maintaining the thermal stability required for light blocking layer applications.
2Manufacturing precision
If the amount of pigment is increased to improve taper characteristics, then taper characteristics are improved, but resolution deteriorates
Solution Approach 1:
The patent optimizes the pigment concentration parameter within a specific range (5-30 wt% based on total composition) and combines it with carboxyl-containing polymer binder. This parameter optimization achieves improved taper characteristics while maintaining resolution, avoiding the deterioration that occurs with excessive pigment loading in conventional formulations.
Solution Approach 2:
The patent uses silica nanoparticles as model particles to study and replicate the optical and morphological characteristics of pigment particles. This allows for better control of light scattering and absorption properties, enabling improved taper characteristics without compromising resolution through excessive pigment concentration.
3Temperature
If a binder resin with large molecular weight is used to increase glass transition temperature, then glass transition temperature is increased, but resolution deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the binder resin to an optimal range and incorporates carboxyl functional groups. This parameter change achieves sufficient glass transition temperature for heat resistance while maintaining resolution through improved molecular mobility and less viscous composition during processing.
Solution Approach 2:
The patent introduces carboxyl functional groups at specific locations within the polymer structure to provide localized thermal stability and adhesion properties. This local quality enhancement allows the binder to maintain high glass transition temperature where needed for heat resistance while preserving resolution through improved overall composition flow and pattern formation.
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 achieves improved resolution, linearity, and taper characteristics, enabling the production of high-quality light blocking layers and color filters with enhanced heat resistance and chemical stability, while reducing the need for organic solvents.
Implementation Method 1
a photopolymerizable compound; and a photopolymerization initiator
Implementation Method 2
a colorant including a pigment and a silica nanoparticle
Data Source
AI summary
Disclosed are a black photosensitive resin composition including (A) a binder resin; (B) a colorant including a pigment and a silica nanoparticle; (C) a photopolymerizable compound; (D) a photopolymerization initiator; and (E) a solvent, wherein the silica nanoparticle is included in an amount of about 1 part by weight to about 11 parts by weight based on about 100 parts by weight of the pigment, and a light blocking layer and a color filter using the same.