Black Photosensitive Resin Composition for Controlled Taper Angles
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Solution Overview
Problem
Existing black photosensitive resin compositions struggle to form fine patterns with controlled taper angles and maintain excellent close-contacting force, which is crucial for high-resolution liquid crystal displays and other applications.
Innovation Solution
A black photosensitive resin composition is developed, incorporating a pigment dispersion with two kinds of carbon black having different oil absorptions, combined with a binder resin, photopolymerizable monomer, photopolymerization initiator, and solvent, to achieve controlled taper angles and enhanced close-contacting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single type of carbon black is used as black pigment, then the manufacturing process is simple, but the taper angle cannot be controlled and fine pattern formation is poor
Solution Approach 1:
The black pigment is segmented into two distinct carbon black types with different oil absorption characteristics (first carbon black with 20-40 ml/100g and second carbon black with 60-80 ml/100g). This segmentation allows independent optimization of different functional requirements: one component contributes to fine pattern formation while the other enables taper angle control, resolving the contradiction between manufacturing precision and simplicity.
Solution Approach 2:
The patent creates a composite pigment system by combining two carbon black materials with complementary properties. The first carbon black (lower oil absorption) provides fine pattern definition, while the second carbon black (higher oil absorption) controls the taper angle. This composite approach achieves superior overall performance that neither component could achieve alone, addressing the contradiction between precision and complexity.
2Strength
If conventional black photosensitive resin materials are used, then the material formulation is simple, but the close-contacting (adhesive) force is deteriorated
Solution Approach 1:
The resin composition is formulated as a composite system incorporating the dual carbon black pigment mixture alongside specific binder resins and photopolymerizable components. This composite structure enhances the close-contacting force between the light-blocking layer and glass substrate, as the synergistic interaction between the two carbon black types and the binder resin creates superior adhesion compared to conventional single-component systems.
Solution Approach 2:
The patent modifies key compositional parameters by specifying precise oil absorption ranges for each carbon black type (20-40 ml/100g and 60-80 ml/100g) and their weight ratios (1:99 to 99:1). These parameter changes optimize the balance between adhesive force and pattern formation, resolving the contradiction between strength and composition complexity.
3Strength
If high oil absorption carbon black is used, then the adhesive force is improved, but the fine pattern linearity is deteriorated
Solution Approach 1:
The pigment system is segmented into two functional components: the first carbon black (20-40 ml/100g oil absorption) is responsible for fine pattern linearity, while the second carbon black (60-80 ml/100g oil absorption) contributes to adhesive force. This functional segmentation allows each component to excel at its specific role without compromising the other, resolving the contradiction between strength and precision.
Solution Approach 2:
Different regions of the pigment composition serve different local functions: the lower oil absorption carbon black predominates in areas requiring fine pattern definition, while the higher oil absorption carbon black enhances adhesive properties in the bulk material. This local quality differentiation enables simultaneous achievement of fine pattern linearity and strong adhesion.
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 enables the formation of light-blocking layers with high resolution and excellent close-contacting force, ensuring fine pattern linearity and improved adhesive properties.
Implementation Method 1
a photopolymerization initiator; and (E) a solvent
Data Source
AI summary
A black photosensitive resin composition includes (A) pigment dispersion including at least two kinds of carbon black having different oil absorption from each other; (B) a binder resin; (C) a photopolymerizable monomer; (D) a photopolymerization initiator; and (E) a solvent. A light-blocking layer can be formed using the same.