Photosensitive Resin Composition for Light Blocking Layer
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Solution Overview
Problem
Existing photosensitive resin compositions for light blocking layers in liquid crystal display devices face challenges with sensitivity, developability, and close-contacting properties due to the use of certain binder resins and pigments, particularly when high heat resistance and black pigment content are required.
Innovation Solution
A photosensitive resin composition incorporating a binder resin represented by specific chemical formulas, combined with a reactive unsaturated compound, initiator, pigment, and solvent, which improves adhesion and resolution by optimizing molecular weight and composition ratios, and includes additives like acrylic-based resins and silane coupling agents for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If photosensitive polyimide or phenol-based resin is used as binder resin, then heat resistance is improved, but sensitivity is lowered and organic solvent is required as development solvent
Solution Approach 1:
The patent uses a composite binder resin system combining acrylic-based resin with epoxy resin or polyimide resin. The acrylic-based resin provides good sensitivity and developability, while the epoxy or polyimide component contributes heat resistance. This composite approach allows achieving both high heat resistance and good sensitivity without requiring organic solvents for development.
Solution Approach 2:
The patent modifies the chemical composition parameters of the binder resin by incorporating specific functional groups and adjusting the ratio of different resin components. By changing the resin composition from pure polyimide/phenol to a multi-component system including acrylic resin, the material achieves improved sensitivity and water-based developability while maintaining heat resistance through the epoxy/polyimide portion.
2Object-affected harmful factors
If black pigments are included in large amount to adjust optical density of light blocking layer, then light blocking performance is improved, but sensitivity, developability, and close-contacting properties significantly deteriorate
Solution Approach 1:
The patent introduces a dispersant as an intermediary substance between the black pigment particles and the binder resin. This dispersant improves the distribution and compatibility of pigment particles in the resin matrix, allowing high pigment content for optimal light blocking while preventing aggregation that would otherwise harm sensitivity and close-contacting properties. The dispersant acts as a mediator maintaining system performance despite high pigment loading.
3Object-affected harmful factors
If black pigments are included in large amount to adjust optical density of light blocking layer, then light blocking performance is improved, but developability significantly deteriorates
Solution Approach 1:
The dispersant serves as a mediator that maintains pigment-resin compatibility even at high pigment concentrations required for optimal light blocking. By improving dispersion quality and preventing pigment aggregation, the dispersant ensures that the photoresist composition remains developable with good pattern definition, overcoming the typical developability issues associated with high pigment loading.
4Temperature
If acrylic-based resin is used as binder resin, then heat resistance, shrinkage-resistance, and chemical resistance are improved, but sensitivity, developability, and close-contacting properties are reduced
Solution Approach 1:
The patent creates a composite binder resin system where acrylic-based resin is combined with epoxy resin or polyimide resin. The acrylic component provides heat resistance, shrinkage resistance, and chemical resistance, while the epoxy/polyimide portion contributes good sensitivity and close-contacting properties. This composite formulation achieves a balance of all required properties without the drawbacks of using pure acrylic resin.
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 close-contacting properties, resolution, sensitivity, heat resistance, and chemical resistance, effectively forming high-quality light blocking layers with enhanced taper characteristics and developability.
Implementation Method 1
a photoresist using an azide compound can have low sensitivity and heat resistance and may be affected by oxygen during exposure
Data Source
AI summary
Disclosed are a photosensitive resin composition including (A) a binder resin represented by the following Chemical Formula 1; (B) a reactive unsaturated compound; (C) an initiator; (D) a pigment; and (E) a solvent, and a light blocking layer using the same, wherein, in the following Chemical Formula 1, each substituent is the same as defined in the detailed description.