Cardo-Based Photosensitive Resin for Light Blocking Layers
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Solution Overview
Problem
Existing photosensitive resin compositions for light blocking layers in liquid crystal display devices face challenges with sensitivity, development properties, close contacting properties, heat resistance, shrinkage resistance, and chemical resistance, particularly when using high heat or large amounts of black pigment.
Innovation Solution
A photosensitive resin composition comprising a cardo-based resin, a reactive unsaturated compound, a pigment, an initiator, and a solvent, with specific weight ratios and molecular weights, which includes a cardo-based resin with repeating units and an acrylic-based resin, enhancing sensitivity, development properties, and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If photosensitive polyimide or phenol-based resin is used as binder resin to achieve high heat resistance, then heat resistance is improved, but sensitivity is lowered and organic solvent is required as development solvent
Solution Approach 1:
The patent changes the chemical composition parameters by using cardo-based resin with specific repeating units (Formulae 1 and 2) that contain both high heat resistance characteristics and photosensitivity. The resin structure includes specific functional groups (Z1-Z12, R1-R14) that enable UV curing while maintaining sensitivity to light exposure.
Solution Approach 2:
The patent creates a composite resin system combining cardo-based resin with reactive unsaturated compounds (acrylates, vinyls) and photopolymerization initiators. This composite formulation integrates the heat resistance of cardo-based polymers with the photosensitivity of UV-curable components, achieving both high temperature stability and light sensitivity without requiring organic development solvents.
2Quantity of substance
If large amount of black pigment is included to adjust optical density of light blocking layer, then optical density is improved, but sensitivity, development properties, and close contacting properties are significantly deteriorated
Solution Approach 1:
The patent optimizes the concentration and type of pigment particles in the resin composition. By controlling particle size, surface treatment, and pigment-to-resin ratio, the formulation achieves sufficient optical density while preserving photosensitivity and development properties. The specific cardo-based resin matrix ensures proper pigment dispersion and interaction.
Solution Approach 2:
The cardo-based resin acts as an intermediary medium that facilitates coexistence between pigment particles and photosensitive components. The resin matrix provides a compatible environment that prevents pigment aggregation while maintaining uniform distribution, allowing high optical density without compromising sensitivity or development performance.
3Temperature
If acrylic-based resin is used to achieve good heat resistance and shrinkage-resistance, then heat resistance and shrinkage-resistance are improved, but sensitivity and development property are reduced
Solution Approach 1:
The patent develops a composite system where cardo-based resin serves as the primary binder providing heat and shrinkage resistance, while reactive unsaturated compounds (acrylates, vinyls) provide photosensitivity. The photopolymerization initiators trigger UV curing of the unsaturated compounds, creating a crosslinked network that maintains sensitivity and development properties while the cardo-based matrix provides thermal stability.
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 excellent sensitivity, development properties, close contacting properties, and heat resistance, forming high-quality light blocking layers with minimal residue and pattern formation issues, suitable for high-temperature applications.
Implementation Method 1
a cardo-based resin including repeating units represented by Chemical Formulae 1 and 2; a reactive unsaturated compound
Implementation Method 2
a pigment
Data Source
AI summary
Disclosed are a photosensitive resin composition that includes (A) a cardo-based resin including repeating units represented by the following Chemical Formulae 1 and 2, wherein the substituents of Chemical Formulae 1 and 2 are the same as defined in the specification, (B) reactive unsaturated compound, (C) a pigment, (D) an initiator, and (E) a solvent, and a light blocking layer using the photosensitive resin composition.