Alkali-Soluble Composition for Black Matrix Surface Control
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Solution Overview
Problem
Current compositions for forming black matrices in color display devices lack oil repellency at the top and lipophilicity at the bottom, leading to issues with ink filling and patterning, especially with quantum dot-containing inks, and require higher temperature curing and organic developers, which are not environmentally friendly.
Innovation Solution
A composition comprising an alkali-soluble material, a first surfactant for lipophilicity, and a second surfactant for oil repellency, which forms a cured film that can be patterned at lower temperatures and is compatible with solvent-free inks, allowing for effective ink filling and high-resolution patterning without adverse effects on the pigment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional compositions are used to form black matrices, then the basic light shielding function is achieved, but the composition cannot provide both oil repellency at the top and lipophilicity at the bottom, leading to ink filling issues
Solution Approach 1:
The patent applies local quality by incorporating two different surfactants that distribute to different regions within the same composition. The first surfactant provides lipophilicity at the bottom region, while the second surfactant provides oil repellency at the top region. This allows the black matrix to have different surface properties at different locations, enabling both ink filling at the bottom and ink repellency at the top without compromising either function.
2Reliability
If higher temperature curing is used to achieve proper film formation, then the curing effectiveness is improved, but the environmental sustainability deteriorates due to energy consumption and need for organic developers
Solution Approach 1:
The patent changes the chemical parameters of the composition by introducing specific surfactants that enable effective curing at lower temperatures. The first and second surfactants modify the thermal and surface properties of the composition, allowing the curing process to proceed effectively at reduced temperatures without requiring organic developers. This parameter change maintains curing effectiveness while reducing environmental harm through lower temperature processing and elimination of organic solvent-based developers.
3Manufacturing precision
If organic developers are used for patterning, then the development effectiveness is improved, but the environmental friendliness deteriorates
Solution Approach 1:
The patent replaces persistent organic developers with an aqueous alkaline developer system. The developer formulation uses water-soluble components that can be effectively rinsed away, eliminating the need for organic solvents. This substitution maintains the developer's effectiveness in removing the alkali-soluble material during patterning while dramatically improving environmental friendliness through biodegradability and reduced toxicity of the aqueous system.
4Manufacturing precision
If the composition is designed for high-resolution patterning, then the pattern precision is improved, but the film thickness requirement for partition wall material becomes more difficult to achieve
Solution Approach 1:
The patent segments the functional requirements into different spatial regions within the black matrix structure. By using the dual-surfactant system, the composition enables thin-film high-resolution patterning in the upper region while maintaining sufficient film thickness in the lower region for effective partition wall functionality. The segmented approach allows different parts of the same structure to satisfy different thickness requirements simultaneously.
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 oil repellency at the top and lipophilicity at the bottom of the bank, enabling gap-free ink filling and high-resolution patterning, while allowing for lower temperature curing and using a low-concentration alkaline developer, thus improving environmental sustainability.
Implementation Method 1
a first surfactant; and (III) a second surfactant different from the first surfactant... the cured film exhibits oil repellency at its upper part and lipophilicity at its lower part
Implementation Method 2
the cured film exhibits oil repellency at its upper part... exhibits oil repellency at the top of the bank
Implementation Method 3
an alkali-soluble material... developed with a low-concentration alkaline developer
Implementation Method 4
a step of heating the coating film... capable of curing and being patterned under lower temperature condition
Data Source
AI summary
A composition containing an alkali-soluble material, a cured film and a manufacturing method thereof.