Anthraquinone Dye for Electrowetting Display Ink
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Solution Overview
Problem
Existing dyes for oil-based displays, such as electrowetting systems, require improvements in solubility in low polar solvents, absorption coefficient, and light resistance, with specific anthraquinone-based dyes not adequately addressing these needs for display materials.
Innovation Solution
An anthraquinone-based dye with a specific chemical structure, represented by general formulas (I) and (II), is developed, offering high solubility in low polar solvents like hydrocarbon-based solvents, high molar absorption coefficient, and high light resistance, when dissolved in solvents like n-decane, with an absorption maximum wavelength between 600 to 720 nm, and a product εC value of 500 cm^-1 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dyes are used for oil-based display inks, then the ink can be formulated with standard components, but the solubility in low polar solvents is insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of anthraquinone dyes by introducing specific alkyl groups (particularly branched-chain alkyl groups with 4-20 carbon atoms) at defined positions (R1-R6) and selecting specific substituents (X = H or COOR3) to optimize solubility in low polar solvents while maintaining dye functionality
Solution Approach 2:
The patent creates a composite dye molecule combining the anthraquinone core structure with specific hydrophobic alkyl substituents, forming a composite material that achieves both solubility in low polar solvents and compatibility with display ink formulations
2Illumination intensity
If dyes with high absorption coefficient are selected, then visibility improves, but light resistance deteriorates
Solution Approach 1:
The patent optimizes the chemical structure parameters of the anthraquinone dye, specifically selecting substituents and their positions to achieve a balance between absorption coefficient and light resistance, with the dye exhibiting both high molar absorption coefficient and excellent light fastness
3Reliability
If dyes with high solubility in low polar solvents are used, then visibility in electrowetting displays improves, but absorption coefficient may be compromised
Solution Approach 1:
The patent carefully adjusts the chemical structure parameters of the anthraquinone dye, including the type and position of alkyl groups (R1-R6) and substituents (X), to simultaneously achieve high solubility in low polar solvents and high molar absorption coefficient, with εC product of 500 cm^-1 or more
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 anthraquinone-based dye provides high visibility and durability for displays, especially electrowetting displays, and can be combined with other dyes to form a favorable black ink with excellent light shielding properties, suitable for both display and optical shutter applications.
Implementation Method 1
when the dye is dissolved in n-decane, an absorption maximum wavelength in a wavelength region of from 350 to 750 nm falls within the range of from 600 to 720 nm, and a product εC of a molar absorption coefficient ε
Implementation Method 2
an electrowetting system is a system in which an image is displayed by disposing plural pixels filled with two phases of an aqueous medium and an oil based coloring ink on a substrate, controlling the affinity at an interface between the aqueous medium and the oil based coloring ink for every pixel by ON-OFF of voltage impression
Implementation Method 3
an electrophoresis system is a system in which an image is displayed by impressing an electric field to a layer prepared by dispersing plural microcapsules including an oil based solvent and colored electrophoretic particles in a binder and thinly coating the dispersion and transferring the colored electrophoretic particles
Data Source
AI summary
An object of the present invention is to provide an anthraquinone based dye having excellent solubility in a low polar solvent and having high absorption coefficient and high light resistance and an ink containing the same. The present invention relates to an ink comprising a specific anthraquinone based dye.