Black Resin Composition for Touch Panel Black Matrix
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Solution Overview
Problem
Conventional black resin compositions for forming black matrices in color filters and touch panels face challenges in achieving high insulation properties and achromatic reflection after heat treatment, with existing materials either losing resistance or requiring thick film thicknesses that compromise flatness and light-shielding efficiency.
Innovation Solution
A black resin composition comprising surface-treated carbon black and titanium nitride compound particles, where the carbon black is treated with a sulfur-containing compound and the titanium nitride compound is produced by thermal plasma method, providing a mixture that maintains insulation properties and achromatic reflection even after high-temperature heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If carbon black is used as a light-shielding material to achieve high insulation properties, then resistance value is improved, but when heat-treated at high temperature the resistance decreases
Solution Approach 1:
The patent uses a composite light-shielding material consisting of carbon black combined with specific inorganic particles (silicon oxide, silicon nitride, silicon oxynitride, or boron nitride) to achieve both high insulation properties and heat treatment stability. The inorganic particles form a protective structure that prevents carbon black from losing resistance during high-temperature heat treatment while maintaining effective light shielding.
Solution Approach 2:
The patent changes the compositional parameters by specifying precise proportions: carbon black content of 5-50 wt% and inorganic particle content of 50-95 wt%, with the inorganic particles having specific surface areas and particle size distributions. These parameter optimizations ensure the composite material maintains insulation properties after heat treatment at 250°C or higher.
2Reliability
If titanium nitride oxide is used as a light-shielding material to achieve high resistance value, then insulation properties are improved, but the transmitted light is colored blue and reflected light is colored red
Solution Approach 1:
The patent combines carbon black with specific inorganic particles (silicon oxide, silicon nitride, silicon oxynitride, or boron nitride) to create a composite material that achieves both high resistance values and achromatic color properties. The carbon black provides the black color and light shielding, while the inorganic particles maintain structural stability and insulation properties without introducing color tints.
3Reliability
If organic pigments are mixed to achieve high insulation properties, then resistance is improved, but the film thickness needs to be thick which deteriorates flatness
Solution Approach 1:
The patent uses a composite material of carbon black and specific inorganic particles that achieves high insulation properties at reduced film thicknesses. The inorganic particles provide structural support and insulation, allowing the use of thinner films (0.5-5.0 μm) that maintain both electrical insulation and flatness, avoiding the need for thick films required by organic pigment-based solutions.
4Reliability
If carbon black is combined with titanium nitride oxide to achieve high resistance, then insulation properties are improved, but the OD value decreases and sufficient resistance cannot be obtained
Solution Approach 1:
The patent combines carbon black with specific inorganic particles (silicon oxide, silicon nitride, silicon oxynitride, or boron nitride) in optimized proportions to achieve both high OD values and sufficient resistance values. The carbon black provides strong light absorption for high OD, while the inorganic particles maintain structural integrity and electrical insulation, avoiding the resistance degradation problem associated with titanium nitride oxide combinations.
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 high insulation properties and achromatic reflection, ensuring reliable performance and maintaining light-shielding effectiveness without compromising film thickness or flatness, thus enhancing the reliability of the black matrix substrate.
Implementation Method 1
the titanium nitride compound is produced by thermal plasma method
Data Source
AI summary
Disclosed is a black resin composition with which a black matrix having high insulation properties even after heat treatment at a high temperature and, in addition, achromatic reflection properties can be readily formed. The black resin composition comprises (A) a light-shielding material, (B) an alkali-soluble resin, and (C) an organic solvent, and comprises (A-1) a carbon black and (A-2) titanium nitride compound particles as the light-shielding material (A). The carbon black (A-1) is surface-treated with a sulfur-containing compound, and in the surface composition, the percentage of carbon atoms is 95% or less and the percentage of sulfur atoms is 0.5% or more.