Black Matrix Composition Thermal Stability
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Solution Overview
Problem
Existing black matrix compositions for display devices face challenges with thermal stability and light-shielding properties, particularly when carbon black is used, as the dispersing agents and binder polymers tend to decompose at high temperatures, leading to deterioration of light-shielding and insulating properties.
Innovation Solution
A composition comprising carbon black with a volume average particle diameter of 1 to 300 nm, a siloxane polymer with specific repeating units, surface-modified silica fine particles, a thermal base generator, and a solvent is used, which enhances heat resistance and light-shielding properties while maintaining high electric resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black is used as a black pigment in a composition for a black matrix, then light-shielding properties are improved, but thermal stability deteriorates because dispersing agents based on organic materials decompose at high temperatures
Solution Approach 1:
The patent extracts and removes the organic dispersing agent component that causes thermal decomposition. Instead of using organic dispersing agents, the invention employs a solvent system (alcohol or carboxylic acid) that does not decompose at high temperatures, thereby eliminating the source of thermal instability while preserving carbon black's light-shielding properties
Solution Approach 2:
The invention changes the chemical composition parameters of the dispersing medium from organic compounds with low thermal stability to alcohols or carboxylic acids with high thermal stability. This parameter change allows the composition to withstand high temperatures (300°C or higher) without decomposition, while maintaining effective carbon black dispersion and light-shielding performance
2Productivity
If the display pixel area is increased, then productivity is improved, but the black matrix area must be reduced, which complicates the design
Solution Approach 1:
The invention changes the thermal stability parameter of the black matrix material to enable direct formation on the array substrate. By using a composition with high thermal stability (withstanding 300°C or higher), the black matrix can be formed in the same process flow as the thin film transistor, eliminating the need for separate bonding substrate design and reducing overall device complexity
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
This composition allows for the formation of a black matrix with improved thermal stability and light-shielding properties, enabling its use on thin film transistor array substrates without the need for redundant design, thus increasing display area and reducing power consumption.
Implementation Method 1
a siloxane polymer having repeating units represented by the general formulae (Ia), (Ib) and/or (Ic)... This composition allows for the formation of a black matrix with improved thermal stability
Implementation Method 2
a black colorant comprising carbon black having a volume average particle diameter of 1 to 300 nm... improved light-shielding properties
Implementation Method 3
surface modified silica fine particles having, on at least a part of the surface, a functional group represented by the general formula (3)... maintaining high electric resistance
Data Source
AI summary
[Problem] To provide a composition for a black matrix which is a material suitable for manufacturing a black matrix, which is suitable for a high luminance display device structure and has high heat resistance and high light-shielding properties.[Means for Solution] The present invention uses a composition for a black matrix comprising: (I) a black colorant containing carbon black having a volume average particle diameter of 1 to 300 nm; (II) a siloxane polymer to be obtained by hydrolyzing and condensing a silane compound represented by a prescribed formula in the presence of an acidic or basic catalyst; (III) surface modified silica fine particles; (IV) a thermal base generator; and (V) a solvent.