Black Matrix Composition Using Carbon Nanotubes for Optical Density
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Solution Overview
Problem
Display devices face challenges in achieving a high optical density while maintaining low reflectance for their black matrices, which affects display quality.
Innovation Solution
A black matrix composition incorporating carbon black and an array of vertically aligned carbon nanotubes, along with a binder, monomer, photoinitiator, additive, and solvent, is used to enhance optical density and reduce reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical density of the black matrix is increased to improve display quality, then the light absorption capability is enhanced, but the reflectance also increases which degrades display performance
Solution Approach 1:
The patent uses a composite pigment system combining carbon black particles with vertically aligned carbon nanotubes. This composite structure creates multiple light absorption pathways: carbon black provides broadband absorption while the vertically aligned carbon nanotubes add directional absorption capabilities, achieving high optical density without increasing reflectance. The synergistic effect of these two materials resolves the contradiction between optical density and reflectance.
Solution Approach 2:
The patent creates a non-uniform structure with vertically aligned carbon nanotubes that provide localized light absorption properties. The vertical alignment creates different optical properties in different directions, with enhanced absorption for light incident at various angles while maintaining low reflectance. This local quality variation allows the black matrix to achieve high optical density without the uniform reflectance increase that would normally accompany higher optical density.
2Illumination intensity
If conventional black matrix materials are used to achieve high optical density, then light absorption is improved, but the material composition becomes limited and performance optimization is restricted
Solution Approach 1:
The patent extends material composition flexibility by combining organic carbon black with inorganic carbon nanotubes, creating a hybrid composite system. This approach allows optimization of both optical properties and mechanical properties independently, providing versatility in tuning the black matrix performance for different display applications while achieving superior optical density.
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 solution effectively increases optical density and lowers reflectance, thereby improving display quality by optimizing the black matrix composition.
Implementation Method 1
a carbon black as well as an array of vertically aligned carbon nanotubes... to increase the optical density and lower the reflectance of the black matrix
Data Source
AI summary
A black matrix composition and a display device including the same are provided. The black matrix composition includes solids including a pigment including a carbon black and an array of vertically aligned carbon nanotubes, a binder, a monomer, a photoinitiator and an additive, and a solvent.