Lake Color Material Dispersion for High Luminance Color Filters
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Solution Overview
Problem
Conventional color filters face challenges in achieving high luminance and contrast due to low transmittance of pigments, heat resistance issues with dyes, and poor dispersibility of pigment and dye-based compositions, leading to decreased luminance and contamination during the color filter production process.
Innovation Solution
A color material dispersion liquid containing a lake color material combination of an acid dye and polyaluminum chloride with a basicity of 70% or more, where the ratio of four-coordinate to six-coordinate aluminum in the 27Al-NMR spectrum is between 0 to 0.50, and a peak width of six-coordinate aluminum is 13 ppm or less, is used to enhance dispersibility and heat resistance, preventing sublimation during high-temperature processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dyes are used to increase transmittance and luminance, then luminance is improved, but heat resistance deteriorates causing chromaticity change during high-temperature processing
Solution Approach 1:
A binder resin is introduced as an intermediary substance that protects the dye from direct thermal exposure during high-temperature processing. The binder resin forms a protective matrix that maintains dye stability while allowing the color filter to achieve high luminance through superior dye transmittance properties.
Solution Approach 2:
The invention creates a composite color filter structure combining binder resin and dye in a specific configuration. This composite approach allows the binder resin to provide thermal stability during processing while the dye component delivers high transmittance and luminance performance in the final product.
2Illumination intensity
If dyes are used to achieve higher luminance, then luminance is improved, but light resistance deteriorates leading to poor solvent resistance and dye transfer
Solution Approach 1:
The binder resin serves as a protective intermediary that anchors the dye molecules, preventing them from transferring to adjacent pixels or cured films. This intermediary layer maintains dye position and reduces solvent resistance issues while preserving the high luminance benefits of dye-based color filters.
Solution Approach 2:
The invention extracts and addresses the solvent resistance problem separately from the luminance-generating dye component. By formulating a specific binder resin system, the patent isolates the solvent resistance function from the dye, allowing the dye to focus on providing high luminance while the binder handles protective functions.
3Reliability
If pigment dispersion method is used to ensure heat resistance and light resistance, then reliability is improved, but transmittance deteriorates resulting in lower luminance
Solution Approach 1:
Instead of using pigments to achieve heat resistance (which reduces luminance), the invention inverts the approach by using dyes with high transmittance for luminance and employing binder resin formulation and processing conditions to achieve the heat resistance that pigments would normally provide. This inversion allows simultaneous optimization of both luminance and heat resistance.
Solution Approach 2:
The invention changes the parameters of the binder resin and processing conditions to compensate for the lower inherent heat resistance of dyes. By adjusting resin composition, molecular weight, and processing temperature profiles, the patent achieves sufficient heat resistance while maintaining the high luminance advantages of dye-based systems.
4Ease of manufacture
If conventional pigment or dye compositions are used, then color filtering is achieved, but dispersibility deteriorates causing aggregates and decreased contrast
Solution Approach 1:
A dispersant is introduced as an intermediary substance that facilitates uniform distribution of dye particles in the binder resin. This dispersant prevents aggregate formation and ensures homogeneous color layers, thereby maintaining high contrast while enabling effective color filtering functionality.
Solution Approach 2:
The invention optimizes parameters such as particle size distribution, resin viscosity, and dispersant concentration to achieve excellent dispersibility. By controlling these parameters, the patent prevents aggregate precipitation during drying and maintains high contrast in the final color filter product.
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 results in a high-contrast, high-luminance color filter with improved heat resistance and dispersibility, preventing sublimation and contamination, and maintaining performance throughout the color filter production process.
Implementation Method 1
a lake color material of a combination of an acid dye and a polyaluminum chloride
Implementation Method 2
a value of a ratio (I4/I6) between an integral value (I4) of a peak corresponding to a four-coordinate aluminum in a solid-state 27Al-NMR spectrum of the lake color material and an integral value (I6) of a peak corresponding to a six-coordinate aluminum therein
Data Source
AI summary
A color material dispersion liquid comprising: (A) a color material, (B) a dispersant and (C) a solvent, wherein the color material (A) contains a lake color material of a combination of an acid dye and a polyaluminum chloride; a basicity of the polyaluminum chloride is 70% or more; and a value of a ratio (I4/I6) between an integral value (I4) of a peak corresponding to a four-coordinate aluminum in a solid-state 27Al-NMR spectrum of the lake color material and an integral value (I6) a peak corresponding to a six-coordinate aluminum therein, is from 0 to 0.50.